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Hyperpolarization contributes to vascular hyporeactivity in rats with lipopolysaccharide-induced endotoxic shock.

Abstract：

:We have examined the role of membrane hyperpolarization in mediating vascular hyporeactivity induced by bacterial lipopolysaccharide (LPS) in endothelial-denuded strips of rat thoracic aorta ex vivo. The injection of rats with LPS caused a significant fall of blood pressure and a severe vascular hyporeactivity to norepinephrine. The membrane potential recording showed that endotoxemia caused a hyperpolarization when compared to the control. This hyperpolarization was fully restored by methylene blue (MB; 10 microM) and partially reversed by Nomega-nitro-L-arginine methyl ester (L-NAME; 0.3 mM), 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ; 1 microM), tetraethylammonium (TEA; 10 mM), charybdotoxin (CTX; 0.1 microM), or glibenclamide (GB; 10 microM), however, this hyperpolarization was not significantly affected by apamin (0.1 microM), 4-aminopyridine (4-AP; 1 mM), or Ba2+ (50 microM). In addition, the basal tension of the tissues obtained from endotoxemic rats was enhanced by the following order: MB > or = ODQ > TEA > or = L-NAME > or = CTX > GB; whereas apamin, 4-AP or Ba2+ had no significant effects on these tissues. In contrast, none of these inhibitors had significant effects on the membrane potential or the basal tension in control tissues. Our electrophysiological results further confirmed previous studies showing that in addition to nitric oxide, the large conductance Ca2+-activated K+-channels and ATP-sensitive K+-channels are, most likely, responsible for endotoxin-mediated hyporeactivity to vasoconstrictor agents in vascular smooth muscle.

journal_name

Life Sci

journal_title

Life sciences

authors

Chen SJ,Wu CC,Yang SN,Lin CI,Yen MH

doi

10.1016/s0024-3205(00)00978-4

subject

Has Abstract

pub_date

2000-12-29 00:00:00

pages

659-68

issue

6

eissn

0024-3205

issn

1879-0631

pii

S0024320500009784

journal_volume

68

pub_type

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