Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice.

Defining the sequence of events in renal disease is the cornerstone of clinical practice in the nephrologist toolkit. Tissue proteomic analyses are a significant approach to understanding the fundamental physiological and molecular processes of renal pathophysiology. The methods and protocols we present here will allow for the molecular dissection of the kidney in each specific region of interest related to disease sequelae. To determine the effects of disease on specific kidney regions and structures with unique functions, the goals of this protocol are to demonstrate simplified mouse kidney compartmentalization and renal cortical tubule isolation techniques in tandem with streamlined label-free quantitative proteomic workflows. Combining these methods will assist in the identification of perturbed molecular patterns in the whole kidney, medullary compartments, and cortical tubule structures of kidneys, with the ultimate and eventual goal of single-cell proteomics in pathological contexts. Applying these methods in virtually any disease model will be helpful in delineating mechanisms of pathology related to kidney dysfunction.