中文|English
ISSN 1001-5256 (Print)
ISSN 2097-3497 (Online)
CN 22-1108/R
Volume 42 Issue 9
Sep.  2026
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Article Contents

Screening and validation of diagnostic biomarkers in metabolic dysfunction-associated fatty liver disease based on data-independent acquisition quantitative proteomics

DOI: 10.12449/JCH260912
Research funding:

National Natural Science Foundation of China (82505222);

Ministry of Education Humanities and Social Sciences Research Youth Foundation Project (23YJC870002);

Sichuan Provincial Natural Science Foundation (2025ZNSFSC1795)

More Information
  • Corresponding author: Li Qiao, liqiao37@outlook.com (ORCID: 0009-0002-3705-6131); Mu Jie, 1041415560@qq.com (ORCID: 0000-0003-3466-238X)
  • Received Date: 2026-03-07
  • Accepted Date: 2026-04-17
  • Published Date: 2026-09-25
  •   Objective  To screen for and validate key differentially expressed proteins in serum of patients with metabolic dysfunction‑associated fatty liver disease (MAFLD), and to provide a basis for identifying diagnostic biomarkers and developing intervention strategies for this disease.  Methods  A total of 20 patients who were diagnosed with MAFLD in the third affiliated hospital of Chengdu University of Traditional Chinese Medicine from December 2024 to January 2025 were enrolled as MAFLD group, and 20 healthy controls were enrolled as HC group. Demographic data and serum biochemical parameters were collected from both groups. Data-independent acquisition (DIA) quantitative proteomics was used to measure the relative expression levels of serum proteins, and related methods were used to obtain significantly differentially expressed proteins, including the gene ontology functional enrichment analysis, the Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis, protein-protein interaction (PPI) network, Hub node interaction, and weighted gene co-expression network analysis (WGCNA). Rats were given a high-fat diet to establish a model of MAFLD, and randomly assigned to the control group and model group. Serum biochemical parameters and inflammatory factors were measured, liver histopathological changes were observed, and the protein expression levels of MER proto-oncogene tyrosine kinase (MERTK) and matrix metalloproteinase-9 (MMP-9) in liver tissue were verified. The independent-samples t test was used for comparison of normally distributed continuous data between groups, while the Mann-Whitney U test was used for comparison of non-normally distributed continuous data or data with heterogeneity of variance between groups; the chi-square test or the Fisher’s exact test was used for comparison of categorical data between groups.  Results  Compared with the HC group, the MAFLD group had significant increases in the serum levels of aspartate aminotransferase (t=-7.348, P<0.05), alanine aminotransferase (Z=5.088, P<0.05), alkaline phosphatase (t=-3.943, P<0.05), triglyceride (Z=2.070, P<0.05), and high-density lipoprotein cholesterol (t=3.867, P<0.05). A total of 3 559 proteins were identified by DIA serum proteomics, among which 160 differentially expressed proteins were mainly enriched in pathways including metabolic disorders, immune inflammatory response, and extracellular matrix remodeling. The PPI network and the Hub node analysis showed that serpin family E member 1, MMP-9, and intercellular cell adhesion molecule-1 were core regulatory proteins. WGCNA showed that the MEyellow module was significantly positively correlated with MAFLD phenotype (cor=0.55, P<0.001), which was functionally enriched in the efferocytosis pathway. MERTK (P<0.001) and MMP-9 (P<0.001) showed the most significant differential expression in this module. A rat model of MAFLD was successfully established using a high-fat diet, and compared with the control group, the model group had enlarged, yellowish, and greasy liver and disordered structure of hepatic lobules, hepatocyte fatty degeneration, and inflammatory cell infiltration based on HE staining, as well as massive lipid droplet deposition based on oil red O staining, while no obvious fibrous cords were observed in Masson staining. Compared with the control group, the model group had significant increases in the serum levels of aspartate aminotransferase (t=-5.148, P<0.05), alanine aminotransferase (t=-5.663, P<0.05), total bilirubin (t=-13.061, P<0.05), triglyceride (Z=-2.722, P<0.05), total cholesterol (t=3.588, P<0.05), and tumor necrosis factor-α (t=-16.741, P<0.05), as well as significant increases in the protein expression levels of MERTK (t=-11.448, P<0.001) and MMP-9 (t=-10.875, P<0.001) in liver tissue.  Conclusion  MMP-9 and MERTK are abnormally expressed in MAFLD and may be used as potential diagnostic biomarkers for this disease.

     

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