Renal cortical tubular cells

Renal cortical tubular cells are the epithelial cells lining the proximal and distal convoluted tubules in the kidney's cortex, forming key segments of the nephron responsible for modifying glomerular filtrate through selective reabsorption and secretion. These cells, particularly in the proximal convoluted tubule, reabsorb about two-thirds of filtered sodium, water, glucose, amino acids, and other nutrients via transporters like SGLT2, GLUT2, and NHE3, while secreting organic anions, hydrogen ions, and ammonia to maintain electrolyte and acid-base balance. Distal convoluted tubule cells fine-tune sodium, potassium, calcium, and magnesium homeostasis using channels such as TRPM6, TRPV5, and the thiazide-sensitive NaCl cotransporter. In disease, these cells are vulnerable to injury from toxins, ischemia, hyperglycemia, or inflammation, contributing to acute kidney injury, chronic kidney disease, and diabetic nephropathy through mechanisms like oxidative stress and apoptosis. Therapeutically, they are indirectly targeted by drugs like SGLT2 inhibitors, which exploit proximal tubule glucose handling to treat diabetes and heart failure, though this raises risks of tubular necrosis or electrolyte imbalances. Overall, their high metabolic activity and transporter expression make them central to renal homeostasis but also a common site of pathology and drug effects.

Other names

Proximal convoluted tubule cellsdistal convoluted tubule cellscortical renal tubular epithelial cells (RTECs)

Inhibition of sodium-glucose cotransporters (SGLT1/2) in proximal tubule to reduce glucose reabsorption and promote glucosuria; blockade of NaCl cotransporter (Slc12a3) in distal convoluted tubule for natriuresis; antagonism of epithelial sodium channel (ENaC) to reduce sodium reabsorption