Vascular NAD(P)H oxidase mediates endothelial dysfunction in basilar arteries from Otsuka Long-Evans Tokushima Fatty (OLETF) rats.

Abstract:

:We examined the responses of basilar arteries taken from Otsuka Long-Evans Tokushima Fatty (OLETF) rats, a type 2 diabetes model. Both the nitric oxide (NO)-mediated relaxation and the cyclic 3',5'-guanosine monophosphate (cGMP) production elicited by acetylcholine (ACh) were much weaker in OLETF rats than in age-matched control Long Evans Tokushima Otsuka (LETO) rats. The contraction induced by an NO synthase (NOS) inhibitor [N(G)-nitro-L-arginine (L-NNA)] was weaker in the OLETF group. In that group, application of apocynin, an NAD(P)H oxidase inhibitor, normalized (i) ACh-induced relaxation, (ii) L-NNA-induced contraction, and (iii) ACh-induced cGMP production to the LETO levels. Superoxide anion production was greater in basilar arteries from OLETF rats than in those from LETO rats. The protein expression of gp91(phox), an NAD(P)H oxidase subunit, was upregulated in the OLETF arteries (versus LETO ones). These results suggest that the existence of endothelial dysfunction in basilar arteries in type 2 diabetes is related to increased oxidative stress mediated via NAD(P)H oxidase. Possibly, an impairment of NO-dependent relaxation responses and a basal impairment of NO signaling may be responsible for the increased risk of adverse cerebrovascular events in type 2 diabetes.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Matsumoto T,Kobayashi T,Wachi H,Seyama Y,Kamata K

doi

10.1016/j.atherosclerosis.2006.06.005

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

15-24

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(06)00342-X

journal_volume

192

pub_type

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