Deletion of neuronal NOS prevents impaired vasodilation in septic mouse skeletal muscle.

Abstract:

OBJECTIVE:Sepsis-stimulated nitric oxide (NO) production impairs arteriolar responsiveness in skeletal muscle. Using wild type (WT), eNOS(-/-), iNOS(-/-) and nNOS(-/-) mice, we aimed to determine the key nitric oxide synthase (NOS) isoenzyme(s) responsible for the arteriolar hyporesponsiveness to acetylcholine (ACh) in septic skeletal muscle. METHODS:Sepsis was induced by the cecal ligation and perforation procedure (24 h model). We measured the post-ACh increase in red blood cell velocity (V(RBC)) in a capillary fed by the stimulated arteriole as an index of vasodilation. NOS activity and protein expression in the muscle were measured by standard procedures. RESULTS:In all non-septic mice, ACh increased V(RBC) by approximately 150% from baseline. Sepsis impaired this response in WT, eNOS(-/-) and iNOS(-/-) mice, but not in nNOS(-/-) mice. Accordingly, pharmacological inhibition of nNOS with 7-nitroindazole reversed this impairment in WT mice. cNOS (eNOS+nNOS) activity was elevated in septic WT mice; Western blots indicated that this occurred through a post-translational mechanism. iNOS protein activity/expression was negligible. ACh caused dilation via endothelial-derived relaxing factor (EDRF) in WT mice and via endothelial-derived hyperpolarizing factor (EDHF) in eNOS(-/-) mice. Although exogenous NO reduced EDHF-mediated dilation in eNOS(-/-) mice, NOS inhibition did not reverse the sepsis-impaired dilation in these mice. CONCLUSIONS:In our 24-h mouse model of sepsis, NO in skeletal muscle is primarily derived from nNOS. Sepsis impairs both EDRF- and EDHF-mediated dilation in response to ACh. Both genetic deletion and inhibition of nNOS protect against this impairment when the dilation occurs via the EDRF but not EDHF pathway.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Lidington D,Li F,Tyml K

doi

10.1016/j.cardiores.2006.12.022

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

151-8

issue

1

eissn

0008-6363

issn

1755-3245

pii

S0008-6363(07)00003-X

journal_volume

74

pub_type

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