key: cord-0873011-gcwp4o30
authors: Ren, Zhihua; Yu, Yueru; Chen, Chaoxi; Yang, Dingyong; Ding, Ting; Zhu, Ling; Deng, Junliang; Xu, Zhiwen
title: The Triangle Relationship Between Long Noncoding RNA, RIG-I-like Receptor Signaling Pathway, and Glycolysis
date: 2021-11-30
journal: Front Microbiol
DOI: 10.3389/fmicb.2021.807737
sha: 62218c6eff5f042d5305a037682c6fdfc176363e
doc_id: 873011
cord_uid: gcwp4o30

Long noncoding RNA (LncRNA), a noncoding RNA over 200nt in length, can regulate glycolysis through metabolic pathways, glucose metabolizing enzymes, and epigenetic reprogramming. Upon viral infection, increased aerobic glycolysis providzes material and energy for viral replication. Mitochondrial antiviral signaling protein (MAVS) is the only protein-specified downstream of retinoic acid-inducible gene I (RIG-I) that bridges the gap between antiviral immunity and glycolysis. MAVS binding to RIG-I inhibits MAVS binding to Hexokinase (HK2), thereby impairing glycolysis, while excess lactate production inhibits MAVS and the downstream antiviral immune response, facilitating viral replication. LncRNAs can also regulate antiviral innate immunity by interacting with RIG-I and downstream signaling pathways and by regulating the expression of interferons and interferon-stimulated genes (ISGs). Altogether, we summarize the relationship between glycolysis, antiviral immunity, and lncRNAs and propose that lncRNAs interact with glycolysis and antiviral pathways, providing a new perspective for the future treatment against virus infection, including SARS-CoV-2.

Aerobic glycolysis refers to the glycolytic reaction in cells even under aerobic conditions, generating large amounts of lactate. This effect initially occurs in tumor cells and is called the "Warburg" effect. Many studies have reported that aerobic glycolysis occurs in microglia (Cheng et al., 2021a; Wang et al., 2021a) , NK cells, and monocytes under different pathological conditions (Cheng et al., 2016; Sheppard et al., 2021) and even virus-infected macrophages . It is found that the serum and neutrophils of SARS-CoV-2 patients contain high lactate content, which is caused by elevated glycolysis (McElvaney et al., 2020; Jia et al., 2021) . As a vital link in glucose metabolism, glycolysis provides intermediates for the biosynthesis GLYCOLYSIS Glycolytic metabolic enzymes and glucose transporters (GLUTs) regulate glycolysis. Fourteen isoforms of GLUTs transport glucose across the cell membrane to the intracellular space along a concentration gradient (Nomura et al., 2015) . Upregulation of GLUT expression and density and accelerated glucose uptake can promote glycolysis (Liu and Gan, 2016; Ryu et al., 2021) . Metabolic enzymes in glycolysis [HK, LDHA, and pyruvate kinase (PKM)] and lactate have regulatory effects on glycolysis.

Hexokinase is a primary glycolytic rate-limiting enzyme that catalyzes the initial glucose metabolism step by phosphorylating glucose. There are four isoforms of HK, of which HK2 is the form that is more expressed and regulated in tissues (Roberts and Miyamoto, 2015) . HK binds to the mitochondrial outer membrane and interacts with VDACs (DeWaal et al., 2018) . HK can be allosterically inhibited and released from mitochondria by the catalytic product glucose-6-phosphate (G6P; Wilson, 2003) . The massive dissociation of HK2 induces cell death (Smeele et al., 2011) . Knockdown of HK2 inhibits glycolysis while inhibiting mammalian target of rapamycin (mTOR; DeWaal et al., 2018) .

Pyruvate kinase converts phosphoenolpyruvate (PEP) to pyruvate. The expression and low enzymatic activity of pyruvate kinase are essential for lactate as a glucose metabolite (Tamada et al., 2012) . Pyruvate kinase M2 (PKM2) accelerates the production of GLUT and LDHA by upregulating the expression of the C-MYC gene and further promoting aerobic glycolysis (Yang and Lu, 2013) .

Lactate dehydrogenase A, as the terminal enzyme in aerobic glycolysis, converts pyruvate to lactate and is accompanied by the regeneration of NADH to NAD + , which is essential for maintaining glycolytic flux. Overexpression of LDHA and pyruvate dehydrogenase kinase (PDK) prevents pyruvate from entering the TCA cycle (Everts et al., 2014) . Despite the proinflammatory effects of glycolysis, lactate production through hypoxia-lactate axis can upregulate the expression of macrophage genes such as Tgfb and Il10 and M2-like markers, such as Vegf, Mg1-1, Mgl-2, and CD206, which have the effect of reducing inflammation (Ivashkiv, 2020) .

Mammalian target of rapamycin is an influential node in the transition from aerobic phosphorylation to glycolysis and is a key metabolic regulator that promotes glycolysis in multiple immune cells, including T cells, B cells, dendritic cells, macrophages, neutrophils, mast cells, and natural killer cells (Xu et al., 2012) . mTOR appears as two distinct protein complexes and is divided into mTOR Complex1 and 2 (mTORC1 and mTORC2; Edinger et al., 2003) . Activation of mTORC1 signaling encodes nearly every step of glycolysis of gene expression (Duvel et al., 2010) . MTORC2 can phosphorylate Akt Ser 473 to maintain Akt activity, increase the binding of HK2 to mitochondria, and promote glycolysis, while HK2 binding to mitochondria is feedback inhibited by G-6P (Hagiwara et al., 2012; Roberts et al., 2013; Roberts and Miyamoto, 2015; Xue et al., 2015) .

Currently, the more reported glycolytic pathways are AKT/ mTOR or adenosine 5′-monophosphate (AMP)-activated protein kinase (AMPK)/mTOR. Akt phosphorylates tuberous sclerosis complex 2 (TSC2) to activate mTORC1. TSC is a heterologous complex composed of TSC1, TSC2, and TBC1D7, a key factor in regulating mTORC1 activity. TSC2 acts as a GTPase activating protein (GAP) that phosphorylates small GTPase Rheb to inactivate it, activating mTORC1 (Condon and Sabatini, 2019) . Akt is involved in glycolysis upregulated by 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase isoenzymes 3/4 (PFKFB3 and PFKFB4), whereas knockdown of Akt decreases lactate accumulation in cells (Houddane et al., 2017) .

Adenosine 5′-monophosphate (AMP)-activated protein kinase is a heterotrimeric complex upstream of mTORC1, and its activation leads to the repression of anabolic processes. AMPK, as a cellular energy sensor, signals back to the cell by sensing AMP/ATP ratio and is a link between host cells and mitochondria (Gowans et al., 2013; Lin and Hardie, 2018) . AMPK activates TSC2 by phosphorylation, which inhibits mTORC1 function, whereas Akt decreases the AMP/ATP ratio to maintain high levels of ATP, which inhibits the AMPK-mediated phosphorylation and the activation of TSC2 (Wullschleger et al., 2006) .

The regulation of HIF and c-Myc also has a certain promotion effect on glycolysis. Hypoxia-inducible factor (HIF-1α) can directly upregulate the GLUT-1 and participate in glycolytic metabolic enzymes to increase the glycolytic flux, such as hexokinase, pyruvate kinase, and lactate dehydrogenase (Seagroves et al., 2001) . What is more, HIF trans-activates PDK1 to phosphorylate pyruvate dehydrogenase (PDH) and blocks the conversion of pyruvate to acetyl-CoA, which in turn promotes glycolysis (Kim et al., 2006) . Activation of AKT/mTOR can stimulate elevated HIF-1α protein levels (Kaidanovich-Beilin and Woodgett, 2011) . Phosphorylation and activation of AMPK inhibit HIF1α and NFκB by the deacetylation of regulating proteins (Kim, 2018) . As a transcription factor, C-Myc stimulates the same glycolytic genes and enhances the glycolytic pathway as HIF-1. C-Myc increases the target gene expression of GLUTs via pyruvate kinase and LDHA, allowing glucose-derived lactate efflux (Osthus et al., 2000) .

Long noncoding RNAs regulate glycolysis mainly through three aspects. (1) lncRNAs regulate glycolysis by regulating metabolic pathways, including activation of the AKT/mTOR signaling pathway, c-Myc, and miRNA sponge action; (2) LncRNA regulates glucose-related metabolic enzymes, genes, including GLUTs, HK, and LDHA; and(3) LncRNAs regulate glycolysis through epigenetic reprogramming, including histone acetylation and DNA methylation regulation.

At present, studies on the regulation of glycolysis by LncRNA mainly focus on different tumor cells. Many lncRNAs can promote the proliferation and invasion of malignant tumor cells, but many lncRNAs also play an inhibitory role in tumor cells. These studies suggest that lncRNAs may act as cellular metabolic regulatory points and then provide new ideas for disease treatment. It is worth noting that lncRNAs, in addition to directly regulating glycolysis, also act as competing endogenous RNAs (ceRNAs) of microRNAs to become mediators of metabolic reorganization for immune cells (Table 1; Figure 1 ).

Glycolysis is tightly associated with immune cells, trained immunity, and the antiviral pathway as a critical part that supplies energy. Viruses facilitate cellular glycolysis by using signaling pathways upstream of glycolysis, key enzymes, and mitochondrial function, which achieves viral replication and evades innate immunity. The interaction of MAVS with HK2 and lactate communicates the relationship between immunity and metabolism.

Increased glycolysis is a marker of activation of many immune cells and results in changes in various immune cell functions (e.g., natural killer cells, macrophages, and dendritic cells), which indicates that glycolysis is essential in innate immune function (O'Neill et al., 2016; Buck et al., 2017 ; Figure 2 ).

Nk cells are innate lymphocytes involved in controlling early intracellular pathogen infection and produce IFN-γ by recognizing surface receptor activation of target cells (Vivier et al., 2008) . The function of NK cells to produce IFN-γ and granzyme B is achieved by mTOR-mediated upregulation of glucose uptake and glycolysis rate, while mTOR activity is controlled by NK cells developmental signals, inflammatory signals and partly controlled by PI3K (Donnelly et al., 2014; Marcais et al., 2014; Viel et al., 2016) . Similarly, cytokines (e.g., IL-10) target mTOR to activate NK cells to upregulate nutrient transport receptors (e.g., glucose transport receptors and amino acid transport receptors), promoting glycolysis and enhancing NK cells cytotoxicity and producing IFN-γ (O'Brien and Finlay, 2019; Wang et al., 2021b) . In addition, cytokine-induced glycolytic flux, IFN-γ, and granzyme B secretion were reduced without affecting sterol regulatory element-binding protein (SREBP) activity in natural killer cells (Assmann et al., 2017) . Moreover, Seon Ah Lim found that NK injury could be reversed by the HIF-1α-mediated shift from oxidative phosphorylation to glycolysis (Lim et al., 2021) . However, lactate is an influential factor that inhibits the function and survival of NK cells (Brand et al., 2016) .

NK cell function is closely related to aerobic glycolysis; other immune cells are similarly associated with glycolysis. The metabolic shift from oxidative phosphorylation to aerobic glycolysis is an important marker of activating macrophages and dendritic cells and an altered metabolism involved in the signal-directed program of pro-inflammation or antiinflammation (O'Neill and Hardie, 2013) . HIF-1α is a master regulator of aerobic glycolysis and plays a crucial role in macrophage polarization to the M1 phenotype associated with inflammation, and HIF-1α stabilization promotes IL-1α production (Tannahill et al., 2013) . Similarly, HIF-1α is upregulated in SARS-CoV-2 patients and promotes macrophage inflammatory responses . HIF-1α can also induce miR-210 to shift macrophages to a proinflammatory state while knocking down miR-210 limits the cytokine storm (Virga et al., 2021) . Nevertheless, the complex formation between HIF-1α and PKM2 inhibits the expression of HIF-1α and IL-1β and promotes the expression of IL-10, in turn leading to a shift in the macrophage phenotype from proinflammatory M1 ↓ (Zhu et al., 2021b) to pro-reparatory M2 (Palsson-McDermott et al., 2015) . Lactate can counteract the inflammatory effects of HIF-1α and glycolytic metabolites and increase anti-inflammatory genes' expression (Ivashkiv, 2020) . More than this, HIF-1α-mediated lactate induces M2-like polarization of macrophages (Colegio et al., 2014) . Consistently, lactate produced by c-Myc-promoted glycolysis inhibits the production of proinflammatory cytokines in early polarized M1 macrophages (Bae et al., 2021) . Increased glycolysis of dendritic cells results in IL-6 and TNF-α production (Cheng et al., 2021b) . This increase in glycolysis is conducted by Akt driven by the kinases TBK1 and IKKε, which directly promotes the association of the glycolytic enzyme HK-II with mitochondria (Everts et al., 2014) . In addition, glycolysis in dendritic cells can also be activated through PI3K/Akt, inhibiting AMPK and IL-10 ( Krawczyk et al., 2010) . However, inhibition of glycolysis decreases dendritic cell activation and longevity.

Glycolysis plays a crucial role not only in regulating immune cell function but also in training immunity. Trained immunity refers to an enhanced host defense response when subjected to homogenous or heterologous stimulation after receiving an immune stimulation for the first time. This immune memory mainly occurs in immune cells, including monocytes, macrophages, and NK cells (Netea et al., 2011) . Trained immunity is regulated by epigenetic reprogramming and cellular metabolic reprogramming. For example, peripheral monocytes trained with the BCG vaccine have increased H3K4me3 histone modifications associated with promoters of TNFα, IL6, and TLR4 genes, leading to transcriptional activation of proinflammatory cytokines (Covian et al., 2019) . In addition, the process of trained immunity by β-glucan-trained monocytes showed increased glucose consumption, lactate production, and NAD +/NADH ratio. This increase in glycolysis depends on the dectin-1/Akt/HIF1α/mTOR axis while inhibiting Akt, mTOR, or HIF1α inhibits the training immunity of monocytes (Cheng et al., 2014) . Other studies have also shown that mTORdependent HIF1α is a prerequisite for metabolic reprogramming during trained immunity (Bekkering et al., 2018) . Epigenetic reprogramming and cellular metabolic reprogramming also present interactions during trained immunity. Increased glycolysis promotes cytokine production, and cytokine production is achieved by histone modification of cytokine gene promoters. Metabolic intermediates can be served as substrates for epigenetic reprogramming enzymes. For example, the sirtuin family of histone deacetylases (HDACs) depends on the intracellular NAD+ concentration. Moreover, increased expression of glycolytic enzymes is mediated through histone modification effects (Riksen and Netea, 2021) .

Similarly, the control of macrophage glycolysis on histones is fundamental to trained immunity, and the inhibition of glycolysis leads to repressing trained immunity FIGURE 1 | LncRNAs regulate the glucose metabolism. Upstream metabolic pathways interact downstream glycolysis sites. Many lncRNAs regulate glycolysis via glycolysis sites, adenosine 5′-monophosphate (AMP)-activated protein kinase (AMPK)/mammalian target of rapamycin (mTOR), and AKT/mTOR pathway. (Ieronymaki et al., 2019; Keating et al., 2020) . The interaction between epigenetic mechanisms and aerobic glycolysis does not only occur in trained immunity. LDHA in Th1 cells promotes the expression of IFN-γ through histone acetylation (H3K9Ac), which occurs in LDHA-mediated aerobic glycolysis (Peng et al., 2016) .

Innate immunity is a non-specific immunity against foreign pathogens and plays a critical role in protecting higher organisms from pathogenic infections. Infection of host cells by viral pathogens in the antiviral response is recognized by pattern recognition receptors (PRRs). The RLRs are the principal defense cascade molecules of sensing RNA viruses and have cross talk with the recognition mechanism of DNA viruses (Xing et al., 2012; Cai et al., 2021) . RIG-I consists of a DExD/H-box helicase-like domain-containing ATPase and translocase activity, a repressor regulatory domain (RD) at the C-terminal, and two caspase-associated recruitment domains (CARD) at the N-terminal (Takeuchi and Akira, 2010; Schlee and Hartmann, 2016) . When the CTD of RIG-I recognizes 5′ triphosphatecontaining double-stranded (DS) viral RNA, the conformation of RIG-I protein is changed that k63 linked E3 ligase polyubiquitinated at different sites (Sanchez-Aparicio et al., 2017) . Hence, the CARD domain of RIG-I binds to the CARD domain of the downstream adaptive molecule MAVS to induce its activation, and MAVS redistributes and accumulates on the mitochondrial surface to activate IRF3 in response to viral infection (Hou et al., 2011) . MAVS phosphorylates IRF3/IRF7 and NF-kB by activating TBK1 kinase and IKKε, which drives their nuclear translocation, and then activating IRF3 dimer, NF-kB, and AP-1 transcription factors leading to IFN-I transcription and proinflammatory cytokine production. The secreted IFN-I activates IFNAR, leading to phosphorylation and nuclear translocation of STAT1, thereby enabling the expression of IFN-stimulated genes (ISGs) with extensive antiviral function (Stark and Darnell, 2012) . MAVS deletion produces neither activation of NF-κB-and IRF3-responsive viruses, nor IFN-I and proinflammatory factors in RIG-I-mediated antiviral immune responses. The above indicates that MAVS is the sole adaptor downstream of RIG-I (Kumar et al., 2006; Sun et al., 2006) . MAVS co-localizes with the mitochondrial outer membrane protein Bcl-xL at the mitochondrial outer membrane, while mislocalization of MAVS leads to decreased activity and impaired antiviral function (Seth et al., 2005) . Moreover, The TRIM family's ubiquitination generally accompanies post-transcription regulation of MAVS (e.g., TRIM21, 25, 29, and 31) in response to virus infection (Oshiumi et al., 2010; Xing et al., 2016 Xing et al., , 2018 Ren et al., 2020) . SARS-CoV-2 nonstructural protein5 (nsp5) cleaves RIG-I and promotes MAVS degradation to evade innate immunity (Liu et al., 2021b) .

Metabolic pathways and antiviral pathways are closely linked. In Huh7 cells, the Akt-mTOR axis was activated at the early stage of SARS-CoV-2 infection to promote virus replication, while the use of the AKT inhibitor MK-2206 significantly reduced the virus replication and infection capacity. Exposing cells to high glucose significantly increased viral infection, whereas viral replication was significantly reduced after using glycolytic inhibitors, and viral infection was restored after adding exogenous ATP (Kohio and Adamson, 2013) . Other studies have shown that cellular glycolytic flux is significantly increased during viral infection and is a major source of ATP (Rezinciuc et al., 2020) , as viral entry initiates glycolysis, and viral replication amplifies this metabolic change. Glycolysis provides the required metabolic fuel for virus replication, while inhibition of glycolysis reduces viral titers (Smallwood et al., 2017) . As a crucial protein for viral replication, coronavirus nonstructural protein 13 (SCV nsp13) promotes synergistic translocation in the unwinding of duplex RNA in high concentrations of ATP (Jang et al., 2020) .

Increased glycolysis contributes to proinflammatory factors' production and viral replication Erlich et al., 2020) , while low-flux glycolysis enables RLR-mediated IFN-I production, enhancing viral clearance capacity. Zhang et al. (2019b) found that PEP, pyruvate, and lactate were downregulated during the initial phase of RLR-mediated type I interferon production, indicating impaired glycolysis. Increased production of IFN-β and IL-6 and reduced viral replication were found in both Sendai virus (SEV) and herpes stomatitis virus (VSV)-infected mice and cells under the effect of 2-deoxyᴅ-glucose (2-DG; Zhang et al., 2019b) . In addition, it was shown by using galactose medium and 2-DG that inhibition of glycolysis can repress HCV from cell to supernatant release . While glycolysis may contribute to the inflammatory storm (Wang et al., 2020b; Virga et al., 2021) , the absence of glycolysis can lead to the loss of antiviral function in NK cells. Sheppard et al. (2021) found that LDHAmediated aerobic glycolysis is a hallmark of NK cell activation. However, NK cells are more susceptible to MCNV infection in the absence of LDHA, caused by the decreased valueadded rate and defective cytotoxicity of NK cells deficient in LDHA (Sheppard et al., 2021) . Consistently, in early NK cells activated by IL-2/IL-12, mTOR1 significantly upregulated c-Myc and increased the rate of glycolysis, whereas NK cells lacking the c-Myc transcription factor downregulated IFNγ and cytolytic molecule granzyme B (Loftus et al., 2018) . 2-DG in NK cells infected by mouse cytomegalovirus (MCMV) inhibits glycolysis, which in turn leads to decreasing expression of cytotoxic proteins and altering the adhesion of NK cells to target conjugates (Mah et al., 2017) .

Glycolytic rate-limiting enzymes can represent increased glycolysis during viral infection. Elevated levels of HIF-1a protein and its transcriptional activity as measured by GLUT-1, PKM2, and LDHA were found in SARS-CoV-2-infected monocytes, resulting in increased glycolytic flux (Codo et al., 2020) . This increase in glycolysis is necessary for SARS-CoV-2 replication. Ramiere et al. (2014) found that the hepatitis C virus (HCV) can increase HK2 enzyme activity in host cells through the viral protein NS5A, showing increased glucose consumption and lactate secretion. LDHB catalyzes the conversion of lactate and NAD+ to pyruvate, NADH, and H+. Fan et al., 2020 found that classical swine fever virus (CSFV) infection affects lactate and pyruvate content in PG-15 cells via LDHB. LDHB inhibits CSFV replication through the NFκB signaling pathway to repress the replication of CSFV .

Adenosine 5′-monophosphate (AMP)-activated protein kinase inhibits inflammation and viral replication, mediated by the inhibition of glycolysis (O'Neill and Hardie, 2013; Singh et al., 2020) . ZIKV infection caused a time-dependent reduction in the active phosphorylated state of AMPK and its downstream target acetyl-CoA carboxylase. AMPK activation inhibits virusinduced glycolysis, enhances genes' expression with antiviral properties (e.g., IFN, OAS2, ISG15, and MX1), and suppresses inflammatory mediators (e.g., TNF-a and CCL5; Singh et al., 2020) . In VSV-infected mouse macrophages or mouse embryonic fibroblasts (MEFs), AMPK is also found to promote innate immunity by stimulating the Stimulator of Interferon Genes (STING) to upregulate IFN (Prantner et al., 2017) . However, it has been shown that activating and promoting the expression of the catalytic subunit AMPKα2 in fibroblasts infected by HCMV promote glycolysis and induce an environment conducive to viral infection (Dunn et al., 2020) .

Hypoxia-inducible factor-1 and c-Myc regulate glycolytic flux during viral infection. Under normoxic conditions, b-catenin specifically interacts with HIF-1α in alveolar macrophages (AMs) infected by respiratory viruses, thus regulating HIF-1α-driven glycolysis to promote excessive inflammation, leading to inhibition of AMs proliferation . Similarly, cellular mitochondrial oxidative phosphorylation is impaired by HCV infection, resulting in upregulation of HIF-1 and consequently glycolysis-related gene expression (Ripoli et al., 2010) . Avian reovirus (ARV) structural protein σA was found to inhibit LDHA, upregulated hexokinase, and pyruvate kinase mRNA through HIF-1α to promote ATP production and viral replication . What is more, c-Myc promotes glycolysis leading to increased ATP production, which promotes mitochondrial biogenesis. Adenovirus e4orf1 infection of mammary epithelial cells induced activation of c-Myc, significantly improved transcription of HK2 and PFKM, and increased glycolysis (Thai et al., 2014) . Nasopharyngeal carcinoma (NPC) cells infected by Epstein-Barr virus (EBV) have similar conclusions (Xiao et al., 2014) . Upregulation of c-Myc in four DNA tumor viruses, human adenovirus, human papillomavirus, EBV, and Kaposi's associated sarcoma herpesvirus, affects cellular metabolism (Prusinkiewicz and Mymryk, 2021) . Glycolysis and c-Myc expression were increased in DC cells infected with IAV while inhibiting c-Myc activity blocked the increase of glycolysis induced by IAV (Rezinciuc et al., 2020) .

Glycolysis and MAVS-RIG-I are each other's negative regulators, and MAVS communicate the relationship between antiviral immunity and metabolism. This relationship is mainly reflected through HK2-MAVS and lactate-MAVS interaction. On the one hand, glycolysis is impaired during RLR signal activation, and on the other hand, glycolysis inhibits MAVS-TBK1-IRF3 activation and IFN-I production. When RLR triggers MAVS-RIG-I recognition, the binding of MAVS to HK2 switches to binding to RIG-I, resulting in impaired mitochondrial localization and activity of HK2, which in turn impairs subsequent glycolysis , which was also confirmed by Chauhan et al. (2019) . In addition, the interaction of HK2 with MAVS requires binding to VDAC.

Furthermore, in the subsequent study, Chao found that HK2 colocalizes with MAVS and interacts with MAVS CARD domains. However, after this interaction was disrupted, HK2 activity and lactate amount decreased (Chao et al., 2019) . LDHAassociated lactate has a blocking effect on the MAVS-RIG-I signaling pathway. Lactate specifically binds to the TM structural domain of MAVS to inhibit its mitochondrial localization, impair MAVS accumulation, disrupt MAVS-RIG-I interactions, and thus repress IFN-I production. Knockdown of HK2 enhanced TBK1-TRF3 signaling, promoted cytokine production, and strengthened the inhibitory effect on viral replication, which inhibited the inhibitory effect of lactate on MAVS . Similarly, Zhou et al., 2021 found that lactate plays a proviral role in interfering with IFN-β expression and helps HBV-mediated immune escape on virus-infected hepatocellular carcinoma cells and mice (Figure 3) .

Moreover, miR-33/33* was found in macrophages infected with vesicular stomatitis virus (VSV) to inhibit MAVS accumulation by targeting AMPK, thereby inhibiting RIG-I signaling (Liu et al., 2021a) . Other studies have also shown that AMPK decentralizes MAVS distribution in mitochondria and inhibits proinflammatory factors (IFN-β and IL-6; Hanada et al., 2020) . Therefore, we suggest that AMPK may inhibit MAVS accumulation by regulating HK2 or lactate, but the specific mechanism needs further experimental proof.

Not only MAVS is anchored on the mitochondrial membrane surface, but HK2 is also on the mitochondrial membrane surface. Mitochondria are, therefore, the site of communication between antiviral innate immunity and metabolism. As a multi-protein complex, NLRP inflammasomes can promote the maturation and secretion of downstream proinflammatory cytokines (e.g., IL-1β and IL-18), specifically dependent on VDACs (Zhou et al., 2011) . mTORC1-HK-dependent glycolysis is required for NLRP3 inflammasome activation in response to proinflammatory stimuli (Moon et al., 2015) . HK interacts with VDAC to localize to the outer mitochondrial membrane, and dissociation of HK induces NLRP3 activation and IL-1β production (Wolf et al., 2016) , leading to mitochondrial damage and mitochondrial ROS (mtROS) production (Mills et al., 2017) . MtROS formation occurs downstream of the FIGURE 3 | Mitochondrial antiviral signaling protein (MAVS) is a bridge between immunity and glycolysis. Viruses promote hexokinase (HK) activity and lactate production and subsequently impress TANK-binding kinase 1 (TBK1)-IRF3 activation and IFN-I production. Mitochondria HK activity inactivated, and glycolysis is suffered blocks during RIG-I-like receptor (RLR) activation. Lactate negatively regulates RLR-mitochondrial antiviral signaling protein (MAVS) signaling and following reactions. mTOR-cytoROS-HIF1α feedback loop and can induce HIF-1α to promote inflammatory signaling in macrophages, but inhibition of mtROS represses the increase in lactate production (Sohrabi et al., 2018; Silwal et al., 2021) . MtROS drives the polymerization of MAVS and the generation of type-I interferon (Buskiewicz et al., 2016) . MAVS promotes the recruitment and activation of NLPR3 to mitochondria (Subramanian et al., 2013) . In contrast, viruses can target MAVS to interact with NLRP3 and inhibit NLRP3 activation (Cheung et al., 2020) , suggesting that mitochondria are the signaling center that activates antiviral innate immunity and glycolysis. That inflammasome may be involved in MAVS and HK2 interactions. Furthermore, many studies have shown that lncRNAs are characterized by subcellular localization, and this localization role is also included in mitochondria (Wilk et al., 2016) .

Long noncoding RNA and inflammatory pathways are bidirectionally regulated. Lnc01140 inhibits NF-κB activity and reduces macrophage inflammatory response via downregulation of miR-23b . TNFα and IL-1β can upregulate LncRNA Lethe via NF-κB. In contrast, Lethe interacts with the NF-κB subunit RelA, which inhibits the binding of RelA to target genes (Rapicavoli et al., 2013) . Induction of LncRNA DNM3OS overexpression by activated NF-κB in mouse bone marrow-derived macrophages (BMDMS) leads to upregulation of inflammatory and immune response genes under diabetic conditions (Das et al., 2018) . In addition, LncRNA MacORIS inhibits the expression of IFNγ-responsive genes in macrophages via the JAK2/STAT1 phosphorylation pathway . LncRNA GAS5 upregulates mir-544/RUNX3, increasing IFN-γ and NK cell toxicity (Fang et al., 2019) . LncRNA expression regulates the immune response and plays a role in developing myeloid and lymphoid cells polarization (Ahmad et al., 2020) . Li et al. found that LncRNA H19 enhanced the activation of M1 polarization in Kupffer cells and promoted the recruitment and differentiation of bone marrow-derived macrophages . Lnc-DC promotes the differentiation of dendritic cells and facilitates phosphorylation of STAT3 on tyrosine-705 (Chapman et al., 2014) . LncRNA CD56 positively regulates the human NK cell marker CD56, which is involved in NK cell differentiation and development (Zhang et al., 2016) . DC-specific lnc-Dpf3 deficiency enables CCR7 to activate the HIF-1α pathway of DC cells and increase glycolysis. However, lnc-DPF3 directly binds to HIF-1α and inhibits transcription of HIF-1α-dependent glycolysis gene LDHA, thereby inhibiting DC glycolysis metabolism and migration (Liu et al., 2019b) . In addition, lncRNAs act as ceRNAs in regulating both immune cell differentiation and inflammatory responses Nie and Zhao, 2020) .

Target genes of lncRNAs during viral infection are mainly enriched in inflammatory pathways and antiviral signaling pathways, including "NF-κB signaling pathway," "RIG-I-like receptor signaling pathway, " "Jak-signal transducer and activator of transcription (STAT) signaling pathway, " and "TNF-signaling pathway," which are finally reflected in the production of interferons and inflammatory cytokines . LncRNA also regulates epigenetic markers of IFN-encoding chromatin, IFN expression, and susceptibility to viruses (Gomez et al., 2013) , expression of inflammatory mediators, ISGs, immune genes (Carpenter et al., 2013; Cui et al., 2014; Zhang et al., 2019a) . LncRNAs also act as ceRNAs in regulating innate immunity against viral infection. LncRNA IFITM4P can be used as a target of miR-24-3p to regulate the mRNA levels of interferon-induced transmembrane proteins (IFITM1, IFITM2, and IFITM3) and thereby inhibit influenza A virus (IAV) virus replication in vitro (Xiao et al., 2021) . Similarly, LncRNA (MARL) found in scleractinian fish infected with Siniperca chuatsi rhabdovirus (SCRV) acts as a ceRNA for miR-122 to enhance the abundance of MAVS protein, thereby promoting MAVS-mediated antiviral responses (Chu et al., 2020) . On the one hand, lncRNAs act as positive regulators of antiviral innate immunity and inhibit viral replication (Khatun et al., 2021) ; on the other hand, the expression of some lncRNAs may facilitate viral infection and replication (Ouyang et al., 2014; Shirahama et al., 2020) . Therefore, overexpression or silencing of lncRNAs to control antiviral immune responses may be a future direction in antivirus (Table 2; Figure 4 ).

Although many studies have shown that lncRNAs regulate viral replication and proliferation and the antiviral signaling pathways of viral infection are well understood, the mechanism of action of some lncRNAs for antiviral function remains unclear. During viral infection, the rise in aerobic glycolysis provides favorable conditions for viral replication and promotes the secretion of inflammatory factors. MAVS disrupted the mitochondrial localization of HK2, whereas lactate production inhibited MAVS-RIG-I interaction. Therefore, RIG-I-MAVS is an essential pathway of immunity and metabolism.

Long noncoding RNAs can regulate glycolysis in immune cells, and interfere with metabolic pathways and anabolism in virus-infected cells. Studies have shown that the lncRNA MIR4435-2HG in HIV-infected macrophages promote glycolysis by targeting the gene (RPTOR) on mTORC1 that controls glycolysis (Hartana et al., 2021) . LncRNAs inhibit viral replication by binding glutathione S-transferase M1 (GSTM1) and blocking the interaction with the kinase TBK1, elevating TBK1 activity and IFN-I production (Wang et al., 2020c) .

IFN-I-IRF3 axis non-dependent LncRNA-ACOD1 feedback promotes viral replication by promoting the catalytic activity of the metabolic enzyme glutamic oxaloacetic transaminase (GOT2; Wang et al., 2017) . In hepatitis C-infected cells, lncRNA promotes adipogenesis, is vital for releasing viral particles, and has a beneficial effect on viral replication (Sharma et al., 2019; Khatun et al., 2021) . In addition, in many studies, LncRNA often regulates glycolysis in hepatocellular carcinoma cells (Shang et al., 2020) , caused by HBV and HCV infection (Nguyen et al., 2020) . A previous study reported that multiple lncRNAs significantly enrich and regulate interaction networks, including metabolic and TNF signaling pathways in infected Porcine delta coronavirus (PDCoV) cells (Liu et al., 2019a) . Besides, several lncRNA-associated genes are also found clustering in the glycolytic process in African swine fever virus (ASFV)-infected cells, contributing to ASFV pathogenesis (Ju et al., 2021) .

Exploration of the relationship among the three gave us several thoughts. The previous section of this paper showed that LncRNA could act as a regulator of RIG-I, which is necessary for activating downstream TBK1/IRF3 by MAVS (Cai et al., 2017) . What is more, MAVS is inhibited by HK2 and lactate, while LncRNA may regulate HK2-or LDHA-dependent lactate production via upstream kinase stimulation. Accordingly, the role of miRNA in regulating RIG-MAVS and the function of lncRNA as a ceRNA for miRNA, and the recent finding that miRNA enhances glycolysis in HBV-positive cells and promotes HCC cells' development give us a hint. LncRNA may act as ceRNA to promote antiviral innate immunity by interacting with MAVS to dissociate HK2 from mitochondria. As a pathway regulated by many lncRNAs, RIG-I-MAVS, its upregulation or downregulation may also result from downregulation or upregulation of glycolytic flux. However, these conjectures need to be explored through experimentation. With the SARS-CoV-2 pandemic, data suggest that patients with underlying conditions, including diabetes, have more severe infections and sequelae. SARS-CoV-2, as an RNA virus, shifts cell metabolism from oxidative phosphorylation to glycolysis, which triggers excessive inflammatory responses and cytokine storms (Mahrooz et al., 2021) , indicating that cellular metabolism is closely linked to SARS-CoV-2 infection. LncRNA is differentially expressed in COVID-19-infected patients (Devadoss et al., 2021; Taheri et al., 2021) . Therefore, the speculation above may also occur in SARS-CoV-2 infection, giving us a great impetus to explore the relationship between LncRNA, glycolysis, and antiviral innate immunity.

ZR, YY, and CC contributed equally to this work and should be considered co-first authors. All authors contributed to the article and approved the submitted version. 

We apologize for those whose contributions were not cited due to space limitations.

Frontiers in Microbiology | www.frontiersin.org

Long noncoding RNA in myeloid and lymphoid cell differentiation, Polarization and Function

Srebp-controlled glucose metabolism is essential for NK cell functional responses

MYC-mediated early glycolysis negatively regulates proinflammatory responses by controlling IRF4 in inflammatory macrophages

Metabolic induction of trained immunity through the mevalonate pathway

LncRNA-FEZF1-AS1 promotes tumor proliferation and metastasis in colorectal cancer by regulating PKM2 Signaling

FIGURE 4 | Interaction of lncRNA with RIG-I-MAVS pathway. LncRNAs are regulators in NF-κB and IRFs via the RIG-I-MAVS pathway and finally modulate IFN/ cytokines. LncRNAs also directly regulate IFNs, cytokines, and even interferon-stimulated genes (ISGs) through Janus Kinases (JAKs)/signal transducer and activator of transcriptions (STATs) pathway

LDHA-associated lactic acid production blunts tumor Immunosurveillance by T and NK cells

Metabolic instruction of immunity

Reactive oxygen species induce virus-independent MAVS oligomerization in systemic lupus erythematosus

The crosstalk between viral RNA-and DNA-sensing mechanisms

Prion-Like polymerization in immunity and inflammation

Long noncoding RNA EGOT negatively affects the antiviral response and favors HCV replication

A long noncoding RNA mediates both activation and repression of immune response genes

Metabolic control of astrocyte pathogenic activity via cPLA2-MAVS

The STAT3-binding long noncoding RNA lnc-DC controls human dendritic cell differentiation

Antagonism between antiviral Signaling and glycolysis

Hepatitis B virus P protein initiates glycolytic bypass in HBV-related hepatocellular carcinoma via a FOXO3/miRNA-30b-5p/MINPP1 axis

SARS-CoV-2 Nucleocapsid protein interacts with RIG-I and represses RIG-mediated IFN-beta production

Long noncoding RNA PVT1 promotes tumor progression by regulating the miR-143/ HK2 axis in gallbladder cancer

Beta-(1-->4)-Mannobiose acts as an Immunostimulatory molecule in murine dendritic cells by binding the TLR4/MD-2 complex

LncRNA-XIST/microRNA-126 sponge mediates cell proliferation and glucose metabolism through the IRS1/PI3K/ Akt pathway in glioma

mTOR-and HIF-1alpha-mediated aerobic glycolysis as metabolic basis for trained immunity

Broad defects in the energy metabolism of leukocytes underlie immunoparalysis in sepsis

Early glycolytic reprogramming controls microglial inflammatory activation

PB1-F2 protein of highly pathogenic influenza A (H7N9) virus selectively suppresses RNA-induced NLRP3 inflammasome activation through inhibition of MAVS-NLRP3 interaction

Avian reovirus sigmaA-modulated suppression of lactate dehydrogenase and upregulation of glutaminolysis and the mTOC1/eIF4E/HIF-1alpha pathway to enhance glycolysis and the TCA cycle for virus replication

Long noncoding RNA MARL regulates antiviral responses through suppression miR-122-dependent MAVS downregulation in lower vertebrates

Elevated glucose levels favor SARS-CoV-2 infection and monocyte response through a HIF-1alpha/ glycolysis-dependent Axis

Functional polarization of tumour-associated macrophages by tumour-derived lactic acid

Nutrient regulation of mTORC1 at a glance

BCG-induced cross-protection and development of trained immunity: implication for vaccine design

The human long noncoding RNA lnc-IL7R regulates the inflammatory response

Diabetes mellitus-induced long noncoding RNA Dnm3os regulates macrophage functions and inflammation via nuclear mechanisms

Distinct Mucoinflammatory phenotype and the immunomodulatory long noncoding transcripts associated with SARS-CoV-2 airway infection. medRxiv

Hexokinase-2 depletion inhibits glycolysis and induces oxidative phosphorylation in hepatocellular carcinoma and sensitizes to metformin

Long non-coding RNA DLEU2 drives EMT and glycolysis in endometrial cancer through HK2 by competitively binding with miR-455 and by modulating the EZH2/miR-181a pathway

mTORC1-dependent metabolic reprogramming is a prerequisite for NK cell effector function

Human cytomegalovirus induces the expression of the AMPKa2 subunit to drive glycolytic activation and support productive viral infection

Activation of a metabolic gene regulatory network downstream of mTOR complex 1

Differential effects of rapamycin on mammalian target of rapamycin signaling functions in mammalian cells

Targeting evolutionary conserved oxidative stress and Immunometabolic pathways for the treatment of respiratory infectious diseases

TLR-driven early glycolytic reprogramming via the kinases TBK1-IKKvarepsilon supports the anabolic demands of dendritic cell activation

A human long non-coding RNA LncATV promotes virus replication Through restricting RIG-I-mediated innate immunity

LDHB inhibition induces mitophagy and facilitates the progression of CSFV infection

LncRNA GAS5 enhanced the killing effect of NK cell on liver cancer through regulating miR-544/RUNX3

Unveiling the long non-coding RNA profile of porcine reproductive and respiratory syndrome virus-infected porcine alveolar macrophages

The NeST long ncRNA controls microbial susceptibility and epigenetic activation of the interferon-gamma locus

AMP is a true physiological regulator of AMP-activated protein kinase by both allosteric activation and enhancing net phosphorylation

Hepatic mTORC2 activates glycolysis and lipogenesis through Akt, glucokinase, and SREBP1c

MAVS is energized by Mff which senses mitochondrial metabolism via AMPK for acute antiviral immunity

Long noncoding RNA MIR4435-2HG enhances metabolic function of myeloid dendritic cells from HIV-1 elite controllers

LINC01140 alleviates the oxidized lowdensity lipoprotein-induced inflammatory response in macrophages via suppressing miR-23b

MAVS forms functional prion-like aggregates to activate and propagate antiviral innate immune response

Role of Akt/PKB and PFKFB isoenzymes in the control of glycolysis, cell proliferation and protein synthesis in mitogen-stimulated thymocytes

A long noncoding RNA connects c-Myc to tumor metabolism

Insulin Signaling and insulin resistance facilitate trained immunity in macrophages Through metabolic and epigenetic changes

The hypoxia-lactate axis tempers inflammation

A high ATP concentration enhances the cooperative translocation of the SARS coronavirus helicase nsP13 in the unwinding of duplex

Metabolomic analyses reveals new stage-specific features of the COVID-19

Selfrecognition of an inducible host lncRNA by RIG-I feedback restricts innate immune response

Genome-wide transcriptomic analysis of highly virulent African swine fever virus infection reveals complex and unique virus host interaction

GSK-3: functional insights from cell biology and animal models

The Set7 lysine methyltransferase regulates plasticity in oxidative phosphorylation necessary for trained immunity induced by beta-glucan

Inhibition of long noncoding RNA Linc-pint by hepatitis C virus in infected hepatocytes enhances lipogenesis

Regulation of immune cell functions by metabolic reprogramming

HIF-1-mediated expression of pyruvate dehydrogenase kinase: a metabolic switch required for cellular adaptation to hypoxia

Glycolytic control of vacuolar-type ATPase activity: a mechanism to regulate influenza viral infection

Toll-like receptor-induced changes in glycolytic metabolism regulate dendritic cell activation

Essential role of IPS-1 in innate immune responses against RNA viruses

Long noncoding RNA AVAN promotes antiviral innate immunity by interacting with TRIM25 and enhancing the transcription of FOXO3a

Hypoxia drives glucose transporter 3 expression through hypoxiainducible transcription factor (HIF)-mediated induction of the long noncoding RNA NICI

Long noncoding RNA Lnc-MxA inhibits Beta interferon transcription by forming RNA-DNA triplexes at its promoter

Cholangiocytederived Exosomal lncRNA H19 promotes macrophage activation and hepatic inflammation under Cholestatic conditions

Hypoxia-driven HIF-1alpha activation reprograms pre-activated NK cells towards highly potent effector phenotypes via ERK/STAT3 pathways

AMPK: sensing glucose as well as cellular energy status

The long noncoding RNA Lnczc3h7a promotes a TRIM25-mediated RIG-I antiviral innate immune response

Taurine up-regulated gene 1 functions as a master regulator to coordinate glycolysis and metastasis in hepatocellular carcinoma

lncRNA NBR2 modulates cancer cell sensitivity to phenformin through GLUT1

SARS-CoV-2 Nsp5 demonstrates two distinct mechanisms targeting RIG-I and MAVS To evade the innate immune response

MicroRNA-33/33* inhibit the activation of MAVS through AMPK in antiviral innate immunity

Comprehensive genomic characterization analysis of lncRNAs in cells With Porcine Delta coronavirus infection

CCR7 chemokine receptor-inducible lnc-Dpf3 restrains dendritic cell migration by inhibiting HIF-1alpha-mediated glycolysis

lncRNA FEZF1-AS1 is associated With prognosis in lung adenocarcinoma and promotes cell proliferation, migration, and invasion

Metabolic flux and the regulation of mammalian cell growth

Amino acid-dependent cMyc expression is essential for NK cell metabolic and functional responses in mice

lncRNA GAS6-AS1 inhibits progression and glucose metabolism reprogramming in LUAD via repressing E2F1-mediated transcription of GLUT1

Glycolytic requirement for NK cell cytotoxicity and cytomegalovirus control

The complex combination of COVID-19 and diabetes: pleiotropic changes in glucose metabolism

Can a metabolism-targeted therapeutic intervention successfully subjugate SARS-COV-2?

The metabolic checkpoint kinase mTOR is essential for IL-15 signaling during the development and activation of NK cells

Catalogues of mammalian long noncoding RNAs: modest conservation and incompleteness

Characterization of the inflammatory response to severe COVID-19 illness

Mitochondria are the powerhouses of immunity

mTORC1-induced HK1-dependent glycolysis regulates NLRP3 Inflammasome activation

Trained immunity: a memory for innate host defense

Hepatitis B virus: advances in prevention, diagnosis, and therapy

Lnc-ITSN1-2, derived From RNA sequencing, correlates With increased disease risk, activity and promotes CD4(+) T cell activation, proliferation and Th1/Th17 cell differentiation by serving as a ceRNA for IL-23R via sponging miR-125a in inflammatory bowel disease

Structure and mechanism of the mammalian fructose transporter GLUT5

Immunometabolism and natural killer cell responses

Metabolism of inflammation limited by AMPK and pseudo-starvation

A guide to immunometabolism for immunologists

The ubiquitin ligase Riplet is essential for RIG-I-dependent innate immune responses to RNA virus infection

Deregulation of glucose transporter 1 and glycolytic gene expression by c-Myc

NRAV, a long noncoding RNA, modulates antiviral responses through suppression of interferon-stimulated gene transcription

Pyruvate kinase M2 regulates Hif-1alpha activity and IL-1beta induction and is a critical determinant of the Warburg effect in LPS-activated macrophages

Identification of an interferon-stimulated long noncoding RNA (LncRNA ISR) involved in regulation of influenza A virus replication

Glycolysis is an intrinsic factor for optimal replication of a norovirus

Fueling immunity: insights into metabolism and lymphocyte function

Aerobic glycolysis promotes T helper 1 cell differentiation through an epigenetic mechanism

AMP-activated kinase (AMPK) promotes innate immunity and antiviral Defense through modulation of stimulator of interferon genes (STING) Signaling

Metabolic control by DNA tumor virus-encoded proteins

Activity of hexokinase is increased by its interaction with hepatitis C virus protein NS5A

A mammalian pseudogene lncRNA at the interface of inflammation and anti-inflammatory therapeutics

Regulation of MAVS expression and Signaling function in the antiviral innate immune response

Dynamic metabolic reprogramming in dendritic cells: An early response to influenza infection that is essential for effector function

Immunometabolic control of trained immunity

Hepatitis C virus-linked mitochondrial dysfunction promotes hypoxia-inducible factor 1 alpha-mediated glycolytic adaptation

Hexokinase II integrates energy metabolism and cellular protection: Akting on mitochondria and TORCing to autophagy

Akt phosphorylates HK-II at Thr-473 and increases mitochondrial HK-II association to protect cardiomyocytes

Brain cells derived from Alzheimer's disease patients have multiple specific innate abnormalities in energy metabolism

Subcellular localizations of RIG-I, TRIM25, and MAVS complexes

Discriminating self from non-self in nucleic acid sensing

Transcription factor HIF-1 is a necessary mediator of the pasteur effect in mammalian cells

Identification and characterization of MAVS, a mitochondrial antiviral signaling protein that activates NF-kappaB and IRF 3

Long noncoding RNA SLC2A1-AS1 regulates aerobic glycolysis and progression in hepatocellular carcinoma via

lncRNA HULC facilitates efficient loading of HCV-core protein onto lipid droplets and subsequent virus-particle release

Lactate dehydrogenase A-dependent aerobic glycolysis promotes natural killer cell anti-viral and anti-tumor function

Long noncoding RNA U90926 is crucial for herpes simplex virus type 1 proliferation in murine retinal photoreceptor cells

Mitofusin-2 boosts innate immunity through the maintenance of aerobic glycolysis and activation of xenophagy in mice

AMP-activated protein kinase restricts Zika virus replication in endothelial cells by potentiating innate antiviral responses and inhibiting glycolysis

Targeting metabolic reprogramming by influenza infection for therapeutic intervention

Disruption of hexokinase II-mitochondrial binding blocks ischemic preconditioning and causes rapid cardiac necrosis

mTOR-dependent oxidative stress regulates oxLDL-induced trained innate immunity in human monocytes

The JAK-STAT pathway at twenty

The adaptor MAVS promotes NLRP3 mitochondrial localization and inflammasome activation

The specific and essential role of MAVS in antiviral innate immune responses

Evaluation of expression of VDR-associated lncRNAs in COVID-19 patients

Pattern recognition receptors and inflammation

Pyruvate kinase M2: multiple faces for conferring benefits on cancer cells

Succinate is an inflammatory signal that induces IL-1beta through HIF-1alpha

Adenovirus E4ORF1-induced MYC activation promotes host cell anabolic glucose metabolism and virus replication

TGF-beta inhibits the activation and functions of NK cells by repressing the mTOR pathway

Macrophage miR-210 induction and metabolic reprogramming in response to pathogen interaction boost life-threatening inflammation

Functions of natural killer cells

O-GlcNAc transferase promotes influenza A virus-induced cytokine storm by targeting interferon regulatory factor-5

IL-10 enhances human natural killer cell effector functions via metabolic reprogramming regulated by mTORC1 Signaling

Long noncoding RNA NKILA regulates HIV-1 replication and latency through repressing NF-ĸB signaling

Decreased expression of the host long-noncoding RNA-GM facilitates viral escape by inhibiting the kinase activity TBK1 via S-glutathionylation

Blockade of NEAT1 represses inflammation response and lipid uptake via modulating miR-342-3p in human macrophages THP-1 cells

An interferon-independent lncRNA promotes viral replication by modulating cellular metabolism

Rapamycin modulates the Proinflammatory memory-Like response of microglia induced by BAFF

Influenza virus exploits an interferon-independent lncRNA to preserve viral RNA synthesis through stabilizing viral RNA polymerase PB1

Promotion of glycolysis by HOTAIR through GLUT1 upregulation via mTOR signaling

Diverse and pervasive subcellular distributions for both coding and long noncoding RNAs

Isozymes of mammalian hexokinase: structure, subcellular localization and metabolic function

Hexokinase is an innate immune receptor for the detection of bacterial peptidoglycan

Aerobic glycolysis supports hepatitis B virus protein synthesis through interaction between viral surface antigen and pyruvate kinase isoform M2

TOR signaling in growth and metabolism

LncRNA IFITM4P regulates host antiviral responses by acting as a ceRNA

Energy stress-induced lncRNA FILNC1 represses c-Myc-mediated energy metabolism and inhibits renal tumor development

Targeting Epstein-Barr virus oncoprotein LMP1-mediated glycolysis sensitizes nasopharyngeal carcinoma to radiation therapy

Herpes simplex virus 1 tegument protein US11 downmodulates the RLR signaling pathway via direct interaction with RIG-I and MDA-5

Identification of a role for TRIM29 in the control of innate immunity in the respiratory tract

TRIM29 negatively regulates the type I IFN production in response to RNA virus

mTOR, linking metabolism and immunity

Integrated Akt/PKB signaling in immunomodulation and its potential role in cancer immunotherapy

Nuclear PKM2 regulates the Warburg effect

Overexpression of lncRNA IGFBP4-1 reprograms energy metabolism to promote lung cancer progression

Glycometabolism regulates hepatitis C virus release

The long noncoding RNA ROCKI regulates inflammatory gene expression

A long noncoding RNA positively regulates CD56 in human natural killer cells

Lactate is a natural suppressor of RLR Signaling by targeting MAVS

Deep RNA sequencing uncovers a repertoire of human macrophage long intergenic noncoding RNAs modulated by macrophage activation and associated With Cardiometabolic diseases

A long non-coding RNA IVRPIE promotes host antiviral immune responses Through regulating interferon beta1 and ISG expression

The HIF-1alpha antisense long non-coding RNA drives a positive feedback loop of HIF-1alpha mediated transactivation and glycolysis

Longitudinal transcriptome analyses show robust T cell immunity during recovery from COVID-19

Hepatitis B virus rigs the cellular metabolome to avoid innate immune recognition

A role for mitochondria in NLRP3 inflammasome activation

Long non-coding RNAs are associated with Seneca Valley virus infection

Uncoupling of macrophage inflammation from self-renewal modulates host recovery from respiratory viral infection

Deciphering the genomic and lncRNA landscapes of aerobic glycolysis identifies potential therapeutic targets in pancreatic cancer

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

This article has not been published elsewhere in whole or in part. All authors have read and approved the content and agree to submit it for consideration for publication in the journal. All work complies with the Ethical Policies of Frontiers in Microbiology and has been conducted under internationally accepted ethical standards after relevant ethical review.