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Autosomal dominant polycystic kidney disease (ADPKD) is characterized by the development of multiple, progressive, fluid-filled renal cysts that distort the renal parenchyma, leading to end-stage renal failure, mainly after the fifth decade of life. ADPKD is caused by a mutation in the PKD1 or PKD2 genes that encode polycystin-1 (PC-1) and polycystin-2 (PC-2), respectively. PC-1 is an important regulator of several signaling pathways and PC-2 is a nonselective calcium channel. The CFTR chloride channel is responsible for driving net fluid secretion into the cysts, promoting cyst growth. Arginine vasopressin hormone (AVP), in turn, is capable of increasing cystic intracellular cAMP, contributing to cell proliferation, transepithelial fluid secretion, and therefore to disease progression. The aim of this study was to assess if AVP can modulate CFTR and whether PC-1 plays a role in this potential modulation.

Regulation of CFTR Expression and Arginine Vasopressin Activity Are Dependent on Polycystin-1 in Kidney-Derived Cells