key: cord-0022808-duz090x2 authors: Qin, Weiwei; Zhang, Xiao; Chen, Lingnan; Li, Qiujie; Zhang, Benwang; Sun, Lixin; Han, Wei title: Differential urine proteome analysis of a ventilator-induced lung injury rat model by label-free quantitative and parallel reaction monitoring proteomics date: 2021-11-02 journal: Sci Rep DOI: 10.1038/s41598-021-01007-w sha: 5b34beef8a49c2ccf0749daf7fd41b1702967c5c doc_id: 22808 cord_uid: duz090x2 Urine is a promising resource for biomarker research. Therefore, the purpose of this study was to investigate potential urinary biomarkers to monitor the disease activity of ventilator-induced lung injury (VILI). In the discovery phase, a label-free data-dependent acquisition (DDA) quantitative proteomics method was used to profile the urinary proteomes of VILI rats. For further validation, the differential proteins were verified by parallel reaction monitoring (PRM)-targeted quantitative proteomics. In total, 727 high-confidence proteins were identified with at least 1 unique peptide (FDR ≤ 1%). Compared to the control group, 110 proteins (65 upregulated, 45 downregulated) were significantly changed in the VILI group (1.5-fold change, P < 0.05). The canonical pathways and protein–protein interaction analyses revealed that the differentially expressed proteins were enriched in multiple functions, including oxidative stress and inflammatory responses. Finally, thirteen proteins were identified as candidate biomarkers for VILI by PRM validation. Among these PRM-validated proteins, AMPN, MEP1B, LYSC1, DPP4 and CYC were previously reported as lung-associated disease biomarkers. SLC31, MEP1A, S15A2, NHRF1, XPP2, GGT1, HEXA, and ATPB were newly discovered in this study. Our results suggest that the urinary proteome might reflect the pathophysiological changes associated with VILI. These differential proteins are potential urinary biomarkers for the activity of VILI. Urine proteome change differences between VILI and control rats. In the discovery phase, 14 urine samples (7 from the VILI group and 7 from the control group) were analyzed by LC-MS/MS to profile the urine proteome. The quantification was based on feature intensity using Progenesis QIP software, and the database search was performed by Mascot software. In total, 727 proteins with at least one unique peptide were identified with an FDR ≤ 1%. All identification and quantification details are listed in supporting Table S1 . Compared to the control group, 110 proteins (65 upregulated, 45 downregulated) were identified to have significantly differential abundance in the VILI group (1.5-fold change, p < 0.05) (Table S2 ). Functional annotation of the differential proteins. Functional annotation was performed on the differentially expressed proteins identified at the discovery phase using the IPA tool. One hundred ten differential proteins were annotated and classified into cellular locations, diseases and functions, and canonical pathways (Fig. 3) . The cellular locations of the differentially expressed proteins were the cytoplasm (40%), plasma membrane (35%), extracellular space (19%), nucleus (3%), and other (3%) (Fig. 3A) . These differential proteins were enriched in biological process (inflammatory response, organismal injury and abnormalities, tumor morphology) Scientific Reports | (2021) 11:21446 | https://doi.org/10.1038/s41598-021-01007-w www.nature.com/scientificreports/ and molecular and cellular functions (protein degradation, molecular transport, posttranslational modification) (Fig. 3B) . The main canonical pathways in which the differential proteins participated included oxidative stress (NAD salvage pathway II, glutamine biosynthesis I, γ-glutamyl cycle) and the inflammatory response (Fcγ receptor-mediated phagocytosis in macrophages and monocytes, agranulocyte adhesion and diapedesis, crosstalk between dendritic cells and natural killer cells, glucocorticoid receptor signaling) (Fig. 3C) . To better understand the pathogenic mechanisms in VILI, the protein-protein interaction (PPI) network for 110 changed proteins was constructed by STRING (Fig. 4) . The STRING PPI network analysis showed that the average node degree was 2.78, the average local clustering coefficient was 0.354, and the PPI enrichment p-value was less than 1.0e−16. This means that these proteins have more interactions among themselves than what would be expected for a random set of proteins of similar size drawn from the genome. As shown in Fig. 4 , many proteins were at the core of the "traffic link", such as MME (Neprilysin), DPP4 (Dipeptidyl peptidase 4), HSPA8 (Heat shock cognate 71 kDa protein), HEXB (Beta-hexosaminidase subunit beta), LGALS3 (Galectin-3), XPNPEP2 (Xaa-Pro aminopeptidase 2), CTSD (Cathepsin D), LAP3 (Cytosol aminopeptidase), which suggests that they may play an important role in the development of VILI. To further validate the differential proteins identified at the discovery phase, twelve urine samples were analyzed by the LC-MS/MS workflow. For spectral library generation, fractions separated by the spin column were analyzed by DDA-MS and then processed using Proteome Discoverer and Skyline. In total, sixty-four proteins with 271 peptides were finally used for validation by PRM-targeted proteomics (Table S3) after using pooled peptides for optimization. Overall, forty-three proteins (31 increased and 12 decreased) changed significantly (1.5-fold change, p < 0.05) ( Table S4 ). The expression trends of the corresponding proteins were consistent with the results from the DDA discovery phase. After the p-values were adjusted by the Benjamini & Hochberg method, thirteen proteins (11 increased and 2 decreased) were statistically significant changed (Table 1 ). In this preliminary study, urine proteome analysis was used as a discovery tool in order to identify proteins associated with VILI. A total of 727 protein groups were identified, 110 proteins (65 upregulated, 45 downregulated) were identified to have significantly differential abundance in the VILI group (1.5-fold change, p < 0.05), which provides valuable clues for the further study of the mechanisms of VILI. www.nature.com/scientificreports/ Mechanical ventilation is integral to the care of the critically ill, and VILI is a significant iatrogenic condition that can cause additional harm to patients 29 . The mechanisms of ventilator-induced lung injury (VILI) include inflammation, barrier disruption, airspace edema, cell injury, and apoptosis 30 . Consistent with this, the differential proteins of VILI rats in this study were mainly enriched in the inflammatory response, organismal injury and abnormalities, and tumor morphology as well as molecular and cellular functions (protein degradation, molecular transport, posttranslational modification). The main canonical pathways include oxidative stress (NAD salvage pathway II, glutamine biosynthesis I, γ-glutamyl cycle) and the inflammatory response (Fcγ receptor-mediated phagocytosis in macrophages and monocytes, agranulocyte adhesion and diapedesis, crosstalk between dendritic cells and natural killer cells). It is strongly suggested that oxidative stress and inflammation are closely related to ventilator-induced lung injury 31 . Mechanical ventilation is able to trigger the release of numerous proinflammatory mediators, such as interleukin (IL)-1β, IL-6, IL-8, tumor-necrosis factor (TNF)-α, C-X-C motif ligand 1 (CXCL1) and CXCL10 32 , which could induce lung injury and impair pulmonary function via the inflammatory response. Apart from proinflammatory mediators, the increased production of reactive oxygen species (ROS) in the lung is the other potential initiating signal for VILI 33 . ROS upregulate the expression of pro-inflammatory . STRING PPI network analysis of the one hundred and ten differentially changed proteins in VILI rats. The average node degree is 2.78, the average local clustering coefficient is 0.354, and the PPI enrichment p-value is less than 1.0e−16. To better understand the urinary proteome in VILI, the protein-protein interaction (PPI) network for 110 changed proteins was constructed by STRING, revealing that these proteins have more interactions among themselves than would be expected for a random set of proteins of similar size drawn from the genome. Such an enrichment indicates that the proteins are at least partially biologically connected in VILI as a group. And there are 6 proteins in two isolated networks not linked to the rest. It is noteworthy that some of these proteins, such as MME, DPP4, HSPA8, HEXB, LGALS3, XPNPEP2, CTSD, and LAP3, were found in the core regions. According to previous studies, MME, LGALS3, HEXB, and CTSD are related to the pathways of the innate immune system, while DPP4, LGALS3, XPNPEP2, and LAP3 are related to the metabolism of proteins and carbohydrates. Therefore, the immune response and metabolic reaction might contribute to the development of VILI. Further study on the role of these proteins is expected to deepen the role of these proteins in the pathogenesis of VILI. Dipeptidyl peptidase 4 (DPP4), one of the nodes in the PPI network, is expressed principally on type I and II alveolar cells, alveolar macrophages, the vascular endothelium, and the pleural mesothelium 26 . And DPP4 plays critical regulation roles in several pulmonary diseases, such as asthma, COPD, ischemia-reperfusion injury, and pneumonia 27 . A recent study demonstrated the beneficial effects of DPP4 inhibition on ischemia-reperfusion lung injury 35 . Besides, DPP4 inhibition by sitagliptin attenuates LPS-induced lung injury 36 . Later, Gou et al. reported that saxagliptin could alleviate oxidative stress, inflammation and apoptosis in ALI induced by LPS by modulating the Nrf-2/HO-1 and NF-κB pathways 37 . The other interesting finding in our study is the identification of a panel of 13 urinary proteins changed dramatically with VILI, which holds the potential to be biomarkers of VILI. In addition to DPP4, several of these proteins were previously reported to be closely related to lung injury, such as aminopeptidase N (AMPN), meprin A subunit beta (MEP1B), lysozyme C-1 (LYSC1) and cytochrome c (CYC). As membrane-bound metalloproteases, AMPN is expressed in various cells outside the hematopoietic system, including monocytes/macrophages, fibroblasts, neutrophils, endothelial cells, and epithelial cells. AMPN is a chemoattractant for T lymphocytes, and the aminopeptidase activity in BALF corresponds with the activity of alveolitis observed in pulmonary sarcoidosis 21 . Actinonin, an inhibitor of aminopeptidase N, was reported to modulate chemokine secretion in the lung and thus attenuate the development of lung fibrosis in chronic inflammatory lung diseases 38 . AMPN is downregulated in the BALF of lipopolysaccharide (LPS)-induced direct and indirect lung injury mouse models 13 . Cytochrome c is a small soluble electron carrier heme protein located in large amounts in the inner mitochondrial membrane. It plays an important role in the initiation of apoptosis, which, upon its release from mitochondria to the cytoplasm, leads to the formation of a complex called the apoptosome 39 . Lower serum cytochrome c levels are found in newly diagnosed NSCLC patients than in healthy individuals. Patients in advanced stages and grade 3 histological differentiation showed significantly low levels of serum cytochrome c, and lower levels were associated with worse survival outcomes in NSCLC patients 28 . According to previous reports, the above proteins associated with lung injury were found in BALF, plasma or serum, which were obtained invasively. In this study, these potential protein biomarkers were detected in urine which could be obtained noninvasively and conveniently. The presented work was a pilot study, indicating the feasibility of urine as a potential diagnostic biomarker approach for VILI/ARDS. However, only a small number of ventilation-induced lung injury rats were used to discover urinary biomarkers. Further analysis of other animal models may provide more sensitive and specific candidate biomarkers that may be capable of discriminating between acute lung injury and chronic lung injury. We are well aware of the limited of VILI rat model and the lack of clinical validation, which is necessary for future study. Therefore, a larger number of clinical urine samples are needed for the verification of the sensitivity www.nature.com/scientificreports/ and specificity of the biomarkers. As a single biomarker may hardly achieve satisfactory discriminating power, seeking multiple biomarkers and developing a combinatorial model is hence a desirable strategy. In summary, we revealed the urinary proteome changed significantly in VILI rat model, which revealed that urine can be a good source of biomarkers for lung injury. Therefore, the study provides valuable clues for identifying the potential biomarkers and investigating the pathogenic mechanisms of VILI. Animals and experimental design. Male Wistar rats (180-200 g) were purchased from Charles River China (Beijing, China). All animals were maintained with a standard laboratory diet under controlled indoor temperature (21 ± 2 °C), humidity (65-70%) and 12 h light-dark cycle conditions. The animal experiments were reviewed and approved by Qingdao Municipal Hospital Medical Ethics Committee. All methods were carried out in accordance with relevant guidelines and regulations of the National Health Commission and the Ministry of Science and Technology and performed in accordance with the guidelines for animal research. Thirty-two rats were randomly divided into two groups, the spontaneous breathing control group (n = 16) and mechanical ventilation experimental group (n = 16). The rats were anaesthetized by ketamine (100 mg/kg) and xylazine (10 mg/kg) via intraperitoneal injection. After the rats were properly anaesthetized, a tracheotomy was established. Control rats that underwent tracheotomy were allowed to spontaneous respiration. Experimental rats were connected to a ventilator (Inspira, Harvard Apparatus Ltd., Boston, MA, USA), then subjected to ventilation for 4 h with 30 mL/kg at a rate of 70 breaths/min 40 . Urine was collected by puncture of the bladder. After collection, the urine samples were immediately centrifuged at 2000×g for 30 min at 4 °C and then stored at − 80 °C. Histopathology. After mechanical ventilation, thoracotomy was performed. The middle lobe of the right lung was collected and washed in normal saline. The water on the surface of the lung was removed, and the wet weight was obtained. Then, the lung tissues were placed in an oven at 80 °C. Then, 48 h later, the lungs were weighed again as the dry weight. The wet/dry weight ratio was calculated to evaluate lung edema: wet-to-dry (W/D) = wet weight (mg)/dry weight (mg) 41 . The remaining lung tissues were quickly fixed in 10% neutralbuffered formalin. The formalin-fixed tissues were embedded in paraffin, sectioned (4 mm) and stained with hematoxylin and eosin (H&E) to reveal histopathological lesions. Lung injury score was performed by the method of reference 42 . The scoring criteria included pulmonary edema, bleeding, neutrophil infiltration and small airway injury, each of which was rated as 0-4 points according to the severity of the lesion (0: no lesion or very mild disease; 1: mild lesion; 2: moderate lesions; 3: severe lesions; 4: extremely severe lesions). The total score of 4 items is the lung injury score. Urine sample preparation. Urine samples were centrifuged at 12000×g for 30 min at 4 °C. Six volumes of prechilled acetone were added to 1 mL urine after removing the pellets, and precipitated at 4 °C overnight. Then, lysis buffer (8 mol/L urea, 2 mol/L thiourea, 50 mmol/L Tris, and 25 mmol/L DTT) was used to redissolve the pellets. The protein concentration of each sample was measured by the Bradford protein assay. The proteins were digested with trypsin (Promega, USA) using filter-aided sample preparation methods 43 . Briefly, 100 µg of the protein sample was loaded onto the 10-kD filter unit (Pall, USA). The protein solution was reduced with 4.5 mM DTT for 1 h at 37 °C and then alkylated with 10 mM indoleacetic acid for 30 min at room temperature in the dark. The proteins were digested with trypsin (enzyme-to-protein ratio of 1:50) for 14 h at 37 °C. The peptides were desalted on Oasis HLB cartridges (Waters, USA) and lyophilized for trap column fractionation and LC-MS/MS analysis. To generate a spectral library for PRM analysis, pooled peptide samples from all samples were fractionated using a high-pH reversed-phase peptide fractionation kit (Thermo Pierce, USA) according to the manufacturer's instructions. Briefly, 60 µg of a pooled peptide sample was loaded onto the spin column. A step gradient of increasing acetonitrile concentrations was applied to the column to elute bound peptides. Ten different fractions were collected by centrifugation, including the flow-through fraction, the wash fraction and eight step gradient sample fractions (5, 7.5, 10, 12.5, 15, 17.5, 20 and 50% acetonitrile) 44 . The fractionated samples were dried completely and resuspended in 20 μL of 0.1% formic acid. Three microliters of each of the fractions was loaded for DDA-MS analysis. Germany) was coupled with an EASY-nLC 1200 HPLC system (Thermo Scientific, Germany). Each peptide sample was dissolved in 0.1% formic acid and the concentration was measured by a modified BCA method (Quantitative fluorometric peptide assay kit, Pierce). For each sample, 1 ug peptides was loaded on a reversed-phase trap column (75 µm × 2 cm, 3 µm, C18, 100 Å, Thermo Scientific). The eluent was transferred to a reversed-phase analytical column (50 µm × 500 mm, 2 µm, C18, 100 Å). The eluted gradient was 5-30% buffer B (0.1% formic acid in 80% acetonitrile; flow rate 0.6 μL/min) for 90 min 45 . The MS data were acquired in the data-dependent acquisition mode. Survey MS scans were acquired in the Orbitrap using 350-1550 m/z range with the resolution set to 120,000. The most intense ions per survey scan (top speed mode) were selected for collision-induced dissociation fragmentation, and the resulting fragments were analyzed in the Orbitrap with the resolution set to 30 Identification and label-free quantitative LC-MS/MS data analysis. The raw MS data files were processed using Progenesis QIP software (version 4.1, Nonlinear, Newcastle upon Tyne, UK) for label-free quantification, as previously described 46 . Briefly, features with only one charge or more than five charges were excluded from the analyses. For further quantitation, all peptides (with Mascot score > 30 and P < 0.01) of an identified protein were included. Proteins identified by at least one peptide were retained. The MS/MS spectra were exported and processed with Mascot software (version 2.5.1, Matrix Science, London, UK) against the SwissProt rat database (released in May 2019, containing 8086 sequences). The following search parameters were used for protein identification: 10 ppm precursor mass tolerance, 0.02 Da fragment mass tolerance, up to two missed cleavage sites were allowed in the trypsin digestion, fixed modification of carbamidomethylated cysteine (+ 58.00 Da); and variable modifications of oxidized methionine (+ 15.995 Da) and deamidated glutamine and asparagine (+ 0.984 Da). Only high confident peptide identifications with an FDR ≤ 0.01 were imported into Progenesis software for further analysis. The statistical criteria of an ANOVA p value < 0.05, a minimum of two peptides matched to a protein and a fold change > 1.5 were used as the criteria for identification of differentially expressed proteins. In the discovery phase, one hundred and ten differentially expressed urinary proteins were identified by the label-free DDA proteomic method. All of these proteins were evaluated by the LC-MS/MS method in the other 12 urine samples. For the PRM method, 12 individual samples were analyzed in PRM mode 47 . Finally, 271 peptides were scheduled, and the retention time (RT) segment was set to 8 min for each targeted peptide (Table S3 ). The normalized collision energy was fixed to 30% and the quadrupole isolation window to 1.6 Da. PRM-MS quantification analysis. Skyline (version 3.6.1 10,279) was used to build the spectrum library and filter peptides for PRM analysis 48 . For each targeted protein, 2-6 associated peptides were selected using the following rules: (i) identification in the untargeted analysis with a q value < 1%, (ii) completely digested by trypsin, (iii) containing 8-18 amino acid residues, (iv) exclusion of the first 25 amino acids at the N-terminus of proteins, and (v) fixed carbamidomethylation of cysteine. Prior to individual sample analysis, pooled peptide samples were subjected to PRM experiments to refine the target list. The RT segment was set to 8 min for each targeted peptide with its expected RT in the center based on the pooled sample analysis. The technical reproducibility of the PRM assay was assessed. All of the PRM-MS data were processed with Skyline. By comparing the same peptide across runs, the RT location and integration boundaries were adjusted manually to exclude interfering regions. Each protein's intensity was quantitated using the summation of intensities from its corresponding transitions. Transition settings: precursor charges + 2, + 3; ion charge + 1; ion type b, y, p; product ions from ion 3 to last ion − 1; auto-select all matching transitions; ion match tolerance 0.02 m/z; pick 6 most intense product ions. Prior to the statistical analysis, the quantified protein intensities were normalized according to the summed intensity. The differential proteins were selected using one-way ANOVA, and p-values were adjusted by Benjamini and Hochberg method. Significance was accepted at a p-value of less than 0.05. Bioinformatics analysis was carried out to better study the biological function of the differential proteins. All differential changed urinary proteins were subjected to network and functional analyses using ingenuity pathway analysis (IPA) version 9.0) 49 . Reference set: ingenuity knowledge base (Genes Only), relationship to include: direct and indirect, includes endogenous chemicals. Filter summary: consider only molecules and/or relationships where (species = rat) and (confidence = high) and (data sources = an open access database of genome-wide association results or Bind catalogue of somatic mutations in cancer). Protein-protein interaction networks were constructed using the STRING database (http:// www. string-db. org), which is a database of known and predicted protein interactions, including direct (physical) and indirect (functional) associations. Ethics approval and consent to participate. Male Wistar rats (180-200 g) were purchased from Charles River China (Beijing, China). The animal experiments were reviewed and approved by Qingdao Municipal Hospital Medical Ethics Committee. Statement on ARRIVE guidelines. We declared that this study was carried out in compliance with the ARRIVE guidelines. The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request. 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All authors read and approved the final manuscript. Leader Project of Qingdao Medical Outstanding Subject (VDTR2017Y11). National Natural Science Foundation of China (81973012, 82000881). The authors declare no competing interests. The online version contains supplementary material available at https:// doi. org/ 10. 1038/ s41598-021-01007-w.Correspondence and requests for materials should be addressed to L.S. or W.H. Publisher's note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. 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