Korean J Physiol Pharmacol.  2002 Feb;6(1):15-20.

Involvement of Vascular NAD(P)H Oxidase-derived Superoxide in Cerebral Vasospasm after Subarachnoid Hemorrhage in Rats

Affiliations
  • 1Department of Pharmacology, College of Medicine, Pusan National University, Busan, Korea. chidkim@pusan.ac.kr

Abstract

The role of vascular NAD(P)H oxidase in subarachnoid hemorrhage (SAH)-induced vasospasm in the basilar artery was examined in a rat model. Arterial vasospasm characterized by increased wall thickness and decreased lumen size was observed at 5 to 7 days after 2nd injection of blood into cisterna magna, and these changes were significantly ameliorated by pretreatment of diphenyleneiodonium (DPI, 25microl of 100microM), an inhibitor of NAD(P)H oxidase. To determine the time course of changes in the vascular NAD(P)H oxidase activity, cerebral vasculature was isolated at different time intervals from 12 hrs to 14 days after injection of autologous blood. At 24 hrs after the second injection of blood, the NAD(P)H oxidase activity was markedly increased with an enhanced membrane translocation of p47phox, but by 48 hours both the enzyme activity and p47phox translocation regained normal values, and were remained unchanged up to 14 days after SAH. However, no significant changes in the expression of p22phox mRNA was observed throughout the experiments. These findings suggest that the activation of NAD(P)H oxidase by which assembly of the oxidase components enhanced and subsequent production of superoxide in the early stages of SAH might contribute to the delayed cerebral vasospasm in SAH rats.

Keyword

NAD(P)H oxidase; Subarachnoid hemorrhage; Vasospasm; OFR

MeSH Terms

Animals
Basilar Artery
Cisterna Magna
Membranes
Models, Animal
NADPH Oxidase
Oxidoreductases
Rats*
Reference Values
RNA, Messenger
Subarachnoid Hemorrhage*
Superoxides*
Vasospasm, Intracranial*
NADPH Oxidase
Oxidoreductases
RNA, Messenger
Superoxides
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