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Objective - We aimed at investigating the relationship between Helicobacter pylori infection and in vivo lipid peroxidation and platelet activation, as reflected by urinary 8-iso-prostaglandin (PG)F-2alpha and 11-dehydro-thromboxane (TX)B-2, respectively, in otherwise healthy dyspeptic subjects. Methods and Results - We measured urinary 8-iso-PGF(2alpha) and 11-dehydro-TXB2 excretion in 40 dyspeptic subjects with a positive C-13-urea breath test and 38 dyspeptic individuals with a negative test. Moreover, we investigated the effects of H pylori eradication on prostanoid metabolite excretion in 23 H pylori-positive subjects. We also measured prostanoid metabolite excretion before and after selective cyclooxygenase-2 inhibition with rofecoxib in 4 H pylori-positive subjects. Urinary 8-iso-PGF(2alpha) and 11-dehydro-TXB2 excretion was significantly higher in the H pylori - positive individuals than in controls. A significant direct correlation was found between the degree of positivity to the C-13-urea breath test and urinary 8-iso-PGF(2alpha) excretion. The latter was linearly correlated with urinary 11-dehydro-TXB2. Successful eradication of H pylori infection led to a significant reduction in both 8-iso-PGF(2alpha) and 11-dehydro-TXB2. Furthermore, their levels were unaffected after treatment with rofecoxib. Conclusions - Our study provides evidence of enhanced in vivo lipid peroxidation and platelet activation in association with H pylori infection and suggests a novel mechanism by which an infectious agent could contribute to atherothrombosis.

Helicobacter pylori infection causes persistent platelet activation in vivo through enhanced lipid peroxidation / G., Davi; M., Neri; A., Falco; D., Festi; T., Taraborelli; G., Ciabattoni; Basili, Stefania; F., Cuccurullo; C., Patrono. - In: ARTERIOSCLEROSIS, THROMBOSIS, AND VASCULAR BIOLOGY. - ISSN 1079-5642. - 25:S(2005), pp. 246-251. ((Intervento presentato al convegno 77th Scientific Meeting of the American-Heart-Association tenutosi a New Orleans, LA nel NOV 07-10, 2004 [10.1161/01.atv.0000147128.10278.99].

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