#1777 Proteomic profiling of laser capture microdissection kidneys from diabetic nephropathy patients

Abstract Background and Aims Diabetes nephropathy (DN) remains the primary cause of end-stage renal disease (ESRD), warranting equal attention and separate analysis of glomerular, tubular, and interstitial lesions in its diagnosis and intervention. This study aims to identify the specific proteomics characteristics of DN, and assess changes in the biological processes associated with DN. Method 5 patients with DN and 5 healthy kidney transplant donor control individuals were selected for analysis. The proteomic characteristics of glomeruli, renal tubules, and renal interstitial tissue obtained through laser capture microscopy (LCM) were studied using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Results The expression of multiple heat shock proteins, tubulin, and heterogeneous ribonucleoprotein particle in glomeruli and tubules was significantly reduced. Differentially expressed proteins (DEPs) in the glomerulus showed significant enrichment in pathways related to cell junctions and cell movement, including the regulation of actin cytoskeleton and tight junction. DEPs in renal tubules were significantly enriched in glucose metabolism-related pathways, such as glucose metabolism, glycolysis/gluconeogenesis, and the citric acid cycle. Moreover, the glycolysis/gluconeogenesis pathway was a co-enrichment pathway in both DN glomeruli and tubules. Notably, ACTB emerged as the most crucial protein in the PPI analysis of DEPs in both glomeruli and renal tubules. Conclusion By using LCM and the proteomics analysis, we provide insights into the distinctive characteristics of each sub-region of renal tissue, shedding light on the impact of glycolysis metabolic disorder in DN and the potential role of the glomerular cytoskeleton and cell junction.