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Submitted on June 11, 2003
Revised on September 3, 2003
Accepted on September 30, 2003
From the Department of Physiological Sciences (A.B., M.F.G., K.D., M.A., J.B., P.H., K.S.), Lund University, Sweden, and School of Biomedical Sciences (S.-Z.X., D.J.B.), University of Leeds, UK.
* To whom correspondence should be addressed. E-mail: karl.sward{at}mphy.lu.se.
The reactivity of the vascular wall to endothelin-1 (ET-1) is influenced by cholesterol, which is of possible importance for the progression of atherosclerosis. To elucidate signaling steps affected, the cholesterol acceptor methyl-
-cyclodextrin (m
cd, 10 mmol/L) was used to manipulate membrane cholesterol and disrupt caveolae in intact rat arteries. In endothelium-denuded caudal artery, contractile responsiveness to 10 nmol/L ET-1 (mediated by the ETA receptor) was reduced by m
cd and increased by cholesterol. Neither ligand binding nor colocalization of ETA and caveolin-1 was affected by m
cd. Ca2+ inflow via store-operated channels after depletion of intracellular Ca2+ stores was reduced in m
cd-treated caudal arteries, as shown by Mn2+ quench rate and intracellular [Ca2+] response. Expression of TRPC1, 3, and 6 was detected by reverse transcriptase-polymerase chain reaction, and colocalization of TRPC1 with caveolin-1 was reduced by m
cd, as seen by immunofluorescence. Part of the contractile response to ET-1 was inhibited by Ni2+ (0.5 mmol/L) and by a TRPC1 blocking antibody. In the basilar artery, exhibiting less store-operated channel activity than the caudal artery, ET-1-induced contractions were insensitive to the TRPC1 blocking antibody and to m
cd. Increased store-operated channel activity in basilar arteries after organ culture correlated with increased sensitivity of ET-1 contraction to m
cd. These results suggest that cholesterol influences vascular reactivity to ET-1 by affecting the caveolar localization of TRPC1.
-cyclodextrin
caveolae
endothelin
store-operated Ca2+ channels
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