Mouse Renal Tubular Epithelial Cells

Mouse renal tubular epithelial cells (mRTECs) are primary cells isolated from the mouse renal cortex. Primary mRTECs are routinely identified by positive immunofluorescence for cytokeratin 18 (CK-18), and express proximal tubule-specific markers including villin, aquaporin 1 (AQP1), and sodium-glucose cotransporter 2 (SGLT2).

The foremost advantage of mRTECs lies in their preservation of in vivo-like differentiated functions, a feature lost in immortalized cell lines. Confluent cultures form polarized monolayers with tight junctions and intact transcellular transport, as evidenced by dome formation. These cells retain proximal tubule-specific functional properties, including parathyroid hormone (PTH)-stimulated cAMP synthesis, 24,25-dihydroxyvitamin D3 production, high alkaline phosphatase activity, and Na+-dependent phosphate and α-methylglucoside transport with kinetic parameters matching brush border membrane vesicles. mRTECs can be subcultured for approximately 4-5 passages while maintaining high energetic status and mitochondrial function, making them amenable to continuous ex vivo studies.

mRTECs serve as an indispensable platform for investigating the pathophysiology of acute kidney injury, chronic kidney disease, renal fibrosis, and ischemic injury. Their compatibility with genetically modified mouse strains enables the study of cell-autonomous gene functions through transgenesis or AAV-mediated gene delivery prior to isolation. Furthermore, mRTECs are widely utilized for high-throughput drug screening, toxicological assessment, and mitochondrial bioenergetics analysis. Despite their limited proliferative capacity and propensity for phenotypic drift upon prolonged passage, optimized culture conditions-including serum-free media and matrix-independent growth-support their functional integrity, positioning mRTECs as a gold-standard ex vivo model for renal research.