Hypertension Research Today is a free monthly online journal that collates and summarizes the latest research about Hypertension, including details on symptoms, diagnosis, diet, treatment, causes. | ||||||||
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Quercetin prevents oxidative stress and NF-kappaB activation in gastric mucosa of portal hypertensive rats.Moreira AJ, Fraga C, Alonso M, Collado PS, Zetller C, Marroni C, Marroni N, González-Gallego J Universidade Federal de Rio Grande do Sul and Universidade Luterana do Brasil, Brazil. The present study was designed to investigate the effects of quercetin on oxidative stress and activation of nuclear factor kappa B (NF-kappaB) in an experimental model of portal hypertensive gastropathy induced by partial portal vein ligation (PPVL). Portal pressure was significantly elevated in PPVL rats. Transaminase and alkaline phosphatase activities were not significantly modified, indicating absence of liver injury. Histological analysis of gastric sections showed a lost of normal architecture, with edema and vasodilatation. The cytosolic concentration of thiobarbituric acid reactive substances and the lipoperoxidation measurement by chemiluminiscence were significantly increased. Superoxide dismutase activity in gastric mucosa was significantly reduced. Portal hypertensive gastropathy induced a marked activation of NF-kappaB, accompanied by a decrease in IkappaB protein levels and a significant induction of nitric oxide synthase (iNOS) protein. Administration of quercetin markedly alleviated histological abnormalities and inhibited oxidative stress and NF-kappaB activation. IkappaB decrease and induction of iNOS protein were partially prevented by quercetin. Quercetin treatment, by abolishing the NF-kappaB signal transduction pathway, may block the production of noxious mediators involved in the pathogenesis of portal hypertensive gastropathy. Published 12 October 2004 in Biochem Pharmacol, 68(10): 1939-46.
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