title: The role of pendrin in renal physiology.
abstract: Pendrin is a Na(+)-independent Cl(-)/HCO3(-) exchanger that localizes to type B and non-A, non-B intercalated cells, which are expressed within the aldosterone-sensitive region of the nephron, i.e., the distal convoluted tubule, the connecting tubule, and the cortical collecting duct. Type B cells mediate Cl(-) absorption and HCO3(-) secretion primarily through pendrin-mediated Cl(-)/HCO3(-) exchange. At least in some treatment models, pendrin acts in tandem with the Na(+)-dependent Cl(-)/HCO3(-) exchanger (NDCBE) encoded by Slc4a8 to mediate NaCl absorption. The pendrin-mediated Cl(-)/HCO3(-) exchange process is greatly upregulated in models of metabolic alkalosis, such as following aldosterone administration or dietary NaHCO3 loading. It is also upregulated by angiotensin II. In the absence of pendrin [Slc26a4 (-/-) or pendrin null mice], aldosterone-stimulated NaCl absorption is reduced, which lowers the blood pressure response to aldosterone and enhances the alkalosis that follows the administration of this steroid hormone. Pendrin modulates aldosterone-induced Na(+) absorption by changing ENaC abundance and function through a kidney-specific mechanism that does not involve changes in the concentration of a circulating hormone. Instead, pendrin changes ENaC abundance and function at least in part by altering luminal HCO3(-) and ATP concentrations. Thus, aldosterone and angiotensin II also stimulate pendrin expression and function, which likely contributes to the pressor response of these hormones. This review summarizes the contribution of the Cl(-)/HCO3(-) exchanger pendrin in distal nephron function.
authors: Department of Medicine and.
authors: Susan M
authors: SM
authors: Wall
authors: Yoskaly
authors: Y
authors: Lazo-Fernandez
mesh_terms: D000136:Acid-Base Equilibrium / Q000502:physiology*; D000818:Animals; D027321:Anion Transport Proteins / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology; D027963:Chloride-Bicarbonate Antiporters / Q000502:physiology; D053503:Epithelial Sodium Channels / Q000502:physiology; D006801:Humans; D007668:Kidney / Q000502:physiology*; D026901:Membrane Transport Proteins / Q000502:physiology*; D018345:Mice, Knockout; D023421:Models, Animal; D012965:Sodium Chloride / Q000378:metabolism; D000076988:Sulfate Transporters; D014882:Water-Electrolyte Balance / Q000502:physiology*
chemical_list: D027321:Anion Transport Proteins; D027963:Chloride-Bicarbonate Antiporters; D053503:Epithelial Sodium Channels; D026901:Membrane Transport Proteins; C085609:SLC26A4 protein, human; C494849:Slc26a4 protein, mouse; D000076988:Sulfate Transporters; D012965:Sodium Chloride
keywords: Cl−/HCO3− exchange; ENaC; Pds; Slc26a4; blood pressure; intercalated cells; pendrin