BACKGROUND: Aspirin-triggered production of 15-(R)-epilipoxin A(4) (ATL) has been shown to exert potent antiinflammatory effects and gastric-protective effects, but little is known of its actions on the vasculature. In the present study, we have assessed the contribution of ATL to changes in vascular tone induced by aspirin and have examined the role of nitric oxide (NO) as a mediator of such effects. METHODS AND RESULTS: Intravenous administration of lipoxin A(4) resulted in a short-lived (3 to 4 minutes) reduction in blood pressure (BP; approximately 13 mm Hg at 2.5 microg/kg). Aspirin administered alone resulted in a significant increase in serum ATL and an increase in BP of approximately 10 mm Hg. When ATL synthesis was inhibited by pretreatment with a selective cyclooxygenase-2 inhibitor (celecoxib) or a 5-lipoxygenase inhibitor (zileuton), the aspirin-induced increase in BP was significantly augmented. These agents alone did not affect BP. A lipoxin receptor antagonist, Boc2, also increased the pressor effects of aspirin. Moreover, immunodepletion of neutrophils, a major source of 5-lipoxygenase, resulted in a significant reduction of ATL formation and augmented aspirin's pressor effects. Studies of rat aortic and mesenteric artery ring segments confirmed the vasorelaxant effects of lipoxin A(4) and showed them to be endothelium dependent. CONCLUSIONS: Aspirin-triggered lipoxin synthesis can modulate vascular tone, possibly contributing to changes in regional blood flow during inflammatory reactions, and to the modulation of systemic BP.
BACKGROUND:Aspirin-triggered production of 15-(R)-epilipoxin A(4) (ATL) has been shown to exert potent antiinflammatory effects and gastric-protective effects, but little is known of its actions on the vasculature. In the present study, we have assessed the contribution of ATL to changes in vascular tone induced by aspirin and have examined the role of nitric oxide (NO) as a mediator of such effects. METHODS AND RESULTS: Intravenous administration of lipoxin A(4) resulted in a short-lived (3 to 4 minutes) reduction in blood pressure (BP; approximately 13 mm Hg at 2.5 microg/kg). Aspirin administered alone resulted in a significant increase in serum ATL and an increase in BP of approximately 10 mm Hg. When ATL synthesis was inhibited by pretreatment with a selective cyclooxygenase-2 inhibitor (celecoxib) or a 5-lipoxygenase inhibitor (zileuton), the aspirin-induced increase in BP was significantly augmented. These agents alone did not affect BP. A lipoxin receptor antagonist, Boc2, also increased the pressor effects of aspirin. Moreover, immunodepletion of neutrophils, a major source of 5-lipoxygenase, resulted in a significant reduction of ATL formation and augmented aspirin's pressor effects. Studies of rat aortic and mesenteric artery ring segments confirmed the vasorelaxant effects of lipoxin A(4) and showed them to be endothelium dependent. CONCLUSIONS:Aspirin-triggered lipoxin synthesis can modulate vascular tone, possibly contributing to changes in regional blood flow during inflammatory reactions, and to the modulation of systemic BP.
Authors: Maja Radulovic; Hyesook Yoon; Nadya Larson; Jianmin Wu; Rachel Linbo; Joshua E Burda; Eleftherios P Diamandis; Sachiko I Blaber; Michael Blaber; Michael G Fehlings; Isobel A Scarisbrick Journal: J Neuropathol Exp Neurol Date: 2013-11 Impact factor: 3.685
Authors: Emily V Nosova; Priscilla Yen; Karen C Chong; Hugh F Alley; Eveline O Stock; Alex Quinn; Jason Hellmann; Michael S Conte; Christopher D Owens; Matthew Spite; S Marlene Grenon Journal: J Surg Res Date: 2014-02-12 Impact factor: 2.192
Authors: Guadalupe Ortiz-Muñoz; Beñat Mallavia; Adriaan Bins; Mark Headley; Matthew F Krummel; Mark R Looney Journal: Blood Date: 2014-08-20 Impact factor: 22.113
Authors: Richard D Ye; François Boulay; Ji Ming Wang; Claes Dahlgren; Craig Gerard; Marc Parmentier; Charles N Serhan; Philip M Murphy Journal: Pharmacol Rev Date: 2009-06-04 Impact factor: 25.468