| First Author | Morla L | Year | 2013 |
| Journal | J Biol Chem | Volume | 288 |
| Issue | 14 | Pages | 10124-31 |
| PubMed ID | 23430254 | Mgi Jnum | J:286943 |
| Mgi Id | MGI:6402349 | Doi | 10.1074/jbc.M112.446393 |
| Citation | Morla L, et al. (2013) Renal proteinase-activated receptor 2, a new actor in the control of blood pressure and plasma potassium level. J Biol Chem 288(14):10124-31 |
| abstractText | Proteinase-activated receptor 2 (PAR2) is a G protein-coupled membrane receptor that is activated upon cleavage of its extracellular N-terminal domain by trypsin and related proteases. PAR2 is expressed in kidney collecting ducts, a main site of control of Na(+) and K(+) homeostasis, but its function remains unknown. We evaluated whether and how PAR2 might control electrolyte transport in collecting ducts, and thereby participate in the regulation of blood pressure and plasma K(+) concentration. PAR2 is expressed at the basolateral border of principal and intercalated cells of the collecting duct where it inhibits K(+) secretion and stimulates Na(+) reabsorption, respectively. Invalidation of PAR2 gene impairs the ability of the kidney to control Na(+) and K(+) balance and promotes hypotension and hypokalemia in response to Na(+) and K(+) depletion, respectively. This study not only reveals a new role of proteases in the control of blood pressure and plasma potassium level, but it also identifies a second membrane receptor, after angiotensin 2 receptor, that differentially controls sodium reabsorption and potassium secretion in the late distal tubule. Conversely to angiotensin 2 receptor, PAR2 is involved in the regulation of sodium and potassium balance in the context of either stimulation or nonstimulation of the renin/angiotensin/aldosterone system. Therefore PAR2 appears not only as a new actor of the aldosterone paradox, but also as an aldosterone-independent modulator of blood pressure and plasma potassium. |
