Tear dynamics testing and quantitative proteomics analysis in patients with chronic renal failure

Area of Science:

• Ophthalmology
• Nephrology
• Proteomics

Background:

• Chronic renal failure (CRF) is linked to ocular surface changes, including dry eye syndrome.
• The tear proteome in CRF patients undergoing hemodialysis has not been previously analyzed.
• Understanding these changes is crucial for managing dry eye in CRF patients.

Purpose of the Study:

• To systematically profile tear film proteins in CRF patients undergoing hemodialysis using iTRAQ MS/MS.
• To identify differentially expressed proteins associated with dry eye symptoms in this population.
• To explore potential diagnostic markers and understand the pathogenesis of dry eye in CRF.

Main Methods:

• Isobaric tags for relative and absolute quantitative (iTRAQ) MS/MS was employed for tear sample analysis.
• Ophthalmic examinations were conducted on 20 CRF patients and 10 healthy controls.
• Bioinformatics analysis was used to interpret proteomic data and pathway enrichment.

Main Results:

• A total of 1139 tear proteins were screened, with 212 proteins showing differential expression (77 upregulated, 135 downregulated).
• Enriched pathways included lipid metabolism, inflammation, and immune response.
• Significant changes were observed in proteins such as APOA1, APOA4, APOB, APOE, S100A8, S100A9, S100A4, and HSP90B.

Conclusions:

• This study provides the first iTRAQ proteomic analysis of tears from CRF patients, revealing significant protein expression profile alterations.
• Differentially expressed proteins identified may serve as candidate diagnostic markers for dry eye disease in CRF patients.
• The identified tear film protein changes have potential clinical significance for treating dry eye in hemodialysis patients.