Proteomics profiling of kidney brush border membrane from rats using LC-MS/MS analysis

Area of Science:

• Nephrology
• Proteomics
• Systems Biology

Background:

• Chronic kidney disease (CKD) is characterized by reduced glomerular filtration rate and kidney damage, often indicated by albuminuria.
• Albuminuria, increasing with age, can stem from glomerular or proximal tubule (PT) damage.
• Brush border membranes (BBMs) of PT cells are crucial for maintaining PT function stability.

Purpose of the Study:

• To investigate protein abundance alterations in rat kidney BBMs associated with CKD progression.
• To identify key proteins and regulated molecular pathways involved in CKD using systems biology.
• To understand the role of BBM protein changes in the context of renal disease.

Main Methods:

• LC-MS/MS bottom-up proteomics analysis was performed on BBMs from four groups of rat models.
• Systems biology approaches were employed to analyze proteomic data.
• Protein expression levels were compared between severe CKD and control groups.

Main Results:

• 303 proteins exhibited significantly altered expressions in the severe CKD BBM group compared to controls.
• Proteins such as Ctnnb1, Fah, and Icam1 were annotated to kidney damage and urination disorders.
• Up-regulation of Ctnnb1 (β-catenin) was linked to CKD progression via WNT signaling pathway regulation.

Conclusions:

• Studying BBM protein abundance changes in rat models reveals key pathways and regulators in CKD.
• Findings provide deeper insights into potential CKD mechanisms, applicable to human health.
• Identified protein alterations contribute to understanding the molecular basis of kidney disease progression.