Polycystins under Pressure

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Polycystins under Pressure Bernd Nilius  Cell  Volume 139, Issue 3, Pages 466-467 (October 2009) DOI: 10.1016/j.cell.2009.10.009 Copyright © 2009 Elsevier Inc. Terms and Conditions

Figure 1 Polycystins and Pressure Sensing in Blood Vessels (A) The polycystin TRPP2 (PKD2) is a six-transmembrane domain protein that associates with and inhibits an unidentified stretch-activated cation channel (SAC) in vascular smooth muscle cells. TRPP2 is connected via filamin A to the cortical F-actin cytoskeleton, which also has an inhibitory effect on SAC activity, known as the mechanoprotective cytoskeletal effect. (B) The association between TRPP2 and another polycystin, a large transmembrane domain protein called TRPP1 (PKD1), relieves SAC inhibition. (C) In the myogenic response of blood vessels (also called the Bayliss effect), an increase in intralumenal blood pressure causes vasoconstriction (blue line), which depends on the contraction of smooth muscle cells and requires SAC activity. TRPP2 inhibits SAC activity and dramatically decreases the myogenic response (red line). On the other hand, sequestration of TRPP2 by TRPP1 restores SAC activity and the myogenic response. The dotted red line shows passive vessel dilation level, in response to pressure, in the absence of the myogenic response. Cell 2009 139, 466-467DOI: (10.1016/j.cell.2009.10.009) Copyright © 2009 Elsevier Inc. Terms and Conditions