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Elevation of intravascular pressure causes depolarization and constriction (myogenic tone) of small arteries and arterioles, and this response is a key element in blood flow regulation. However, the nature of pressure-induced depolarization has remained elusive. In the present study, we provide evidence that a transient receptor potential channel (TRPC6) homologue has a major role in this depolarizing response to pressure. Antisense oligodeoxynucleotides to TRPC6 decreased TRPC6 protein expression and greatly attenuated arterial smooth muscle depolarization and constriction caused by elevated pressure in intact cerebral arteries. Suppressing the expression of this channel protein also reduced the current density of a major cation current in resistance artery smooth muscle cells. We propose that TRPC6 channels play an essential role in regulation of myogenic tone.

Transient Receptor Potential Channels Regulate Myogenic Tone of Resistance Arteries