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LOCAL CONTROL OF CIRCULATION
Department of Physiology, Tulane University Health Sciences Center, New Orleans, Louisiana 70112
Submitted 8 October 2002 ; accepted in final form 2 April 2003
Vascular tissues express heme oxygenase, which metabolizes heme to form
carbon monoxide (CO). CO promotes relaxation of vascular smooth muscle but
also inhibits nitric oxide (NO) formation. This study examines the hypothesis
that CO promotes endothelium- and NO synthase-dependent vasoconstriction of
isolated arterioles. Studies were conducted on pressurized first-order
gracilis muscle arterioles isolated from anesthetized male Sprague-Dawley
rats. Exogenous CO, as well as a heme precursor,
-aminolevulinic acid
(
-ALA), constricted arterioles with intact endothelium pretreated with
phenylephrine; these effects were abolished by removal of the endothelium. CO-
and
-ALA-induced vasoconstrictions were converted to dilations by
pretreatment with an inhibitor of NO synthase,
N
-nitro-L-arginine methyl ester, or with
N
-nitro-L-arginine methyl ester and an
NO donor, sodium nitroprusside. Furthermore, CO-induced vasoconstriction was
prevented by pretreatment with the NO synthase substrate
L-arginine. This study shows that exogenous, as well as
endogenously formed, CO can promote endothelium-dependent vasoconstriction in
isolated gracilis muscle arterioles. Because CO-induced vasoconstriction is
abolished by NO synthase blockade and by L-arginine, CO most likely
promotes endothelium-dependent vasoconstriction by inhibiting endothelial NO
formation.
heme oxygenase; nitric oxide; vascular tone;
-aminolevulinic acid
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