Abstract
TRPC-mediated Ca2+ entry has been implicated in the control of smooth muscle proliferation, and might represent a pivotal mechanism underlying in-stent restenosis. As we have observed significant expression of TRPC3 in human smooth muscle from coronary as well as aorta, we tested the efficiency of a recently discovered TRPC3 selective Ca2+ entry blocker, Pyr3 to prevent vascular smooth muscle proliferation and stent implantation-induced hyperplasia of human aorta. The effect of Pyr3 on proliferation was measured by detection of BrdU incorporation and PCNA expression in human coronary smooth muscle and microvascular endothelium, which displays significantly smaller expression levels of TRPC as compared to smooth muscle. Pyr3 inhibited smooth muscle proliferation but lacked detectable effects on endothelial proliferation. Measurements of ATP-induced Ca2+ signals revealed that Pyr3 suppressed agonist-induced Ca2+ entry more effectively in vascular smooth muscle as compared to endothelial cells. Inhibitory effects of Pyr3 on stent implantation-induced arterial injury was tested using a novel in vitro model of in-stent hyperplasia in human arteries based on organ typical culture of human aortic constructs. Pyr3 effectively prevented increases in tissue levels of PCNA and Ki67 at 2 weeks after stent implantation into human aortae. Similarly, proliferation markers were significantly suppressed when implanting a Pyr3 releasing stent prototype as compared to a bare metal stent control. Our results suggest TRPC3 as a potential target for pharmacological control of smooth muscle proliferation. Selectively inhibition of TRPC Ca2+ entry channels in vascular smooth muscle is suggested as a promising strategy for in-stent restenosis prevention.
- Received May 25, 2012.
- Revision received September 11, 2012.
- Accepted September 24, 2012.
- The American Society for Pharmacology and Experimental Therapeutics