Comprehensive proteomic meta-analysis identifies novel proteomics alterations in proliferative diabetic retinopathy

Area of Science:

• Ophthalmology
• Molecular Biology
• Proteomics

Background:

• Proliferative diabetic retinopathy (PDR) is a leading cause of vision loss, with unclear molecular underpinnings.
• Existing proteomics studies on PDR have limitations, including scope, biomarker identification, and validation.

Purpose of the Study:

• To conduct a comprehensive meta-analysis of existing proteomics studies in PDR patients.
• To identify differentially expressed proteins, pathways, and potential biomarkers associated with PDR.
• To validate key findings in preclinical models.

Main Methods:

• Meta-analysis of five proteomics datasets from PDR patients (initially seven studies, 127 samples).
• Random effects model analysis, Principal Component Analysis (PCA), and Gene Ontology enrichment analysis.
• Protein-protein interaction (PPI) network construction and Western blot validation in mouse models (OIR and STZ-induced diabetes).

Main Results:

• Identified 681 differentially expressed proteins in PDR.
• Revealed significant pathway involvement, including complement/coagulation cascades and extracellular matrix.
• Identified novel muscle cell cytoskeleton pathways and highlighted APP, FN1, and CNTN1 as hub proteins.
• Validated downregulation of APP and CNTN1 in mouse models.

Conclusions:

• This meta-analysis provides a comprehensive overview of proteomics alterations in PDR.
• Identified novel molecular pathways and potential therapeutic targets for PDR.
• Highlights the need for further research into the identified proteins and pathways for PDR treatment.