Identification of cells expressing cyclooxygenase-2 in response to interleukin-1β in rat aortae

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  • Nakano Tomoyuki
    Department of Environmental and Preventive Medicine, Hyogo College of Medicine, Japan
  • Wakabayashi Ichiro
    Department of Environmental and Preventive Medicine, Hyogo College of Medicine, Japan

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タイトル別名
  • Identification of Cells Expressing Cyclooxygenase-2 in Response to Interleukin-1.BETA. in Rat Aortae
  • Identification of cells expressing cyclooxygenase 2 in response to interleukin 1 v in rat aortae

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Localization of cyclooxygenase-2 (COX-2) in rat aortae was investigated. In endothelium-intact aortic strips stimulated with interleukin-1β (IL-1β), COX-2 was detected in adventitial fibroblasts and macrophages but not in tunica media. IL-1β−induced COX-2 expression was also detected in medial smooth muscle cells of endothelium-denuded aortae and cultured rat aortic smooth muscle cells. IL-1β−induced COX-2 expression in all of the above cells was abolished in the presence of U0126, an inhibitor of extracellular signal-regulated kinases (ERK). Thus, IL-1β induces COX-2 through the ERK-mediated pathway in adventitial fibroblasts and macrophages of healthy aortae; and in addition, medial smooth muscle cells are also responsible for COX-2 expression in remodeled aortae.

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