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- W2023705247 abstract "Although it is now recognized that low levels of reactive oxygen species (ROS) are required for the mitogenic response, mitogen-induced signalling pathways that regulate ROS generation in non-phagocytic cells remain largely uncharacterized. Using a real-time assay for measuring hydrogen peroxide (H(2)O(2)) formation, we analysed H(2)O(2) release in human HaCaT keratinocytes in response to lysophosphatidic acid (LPA), a mitogen for keratinocytes. LPA rapidly increased H(2)O(2) release in HaCaT cells. Unlike LPA-induced mitogen-activated protein (MAP) kinase activation, LPA-stimulated H(2)O(2) release was independent of the tyrosine kinase activity of the epidermal growth factor (EGF) receptor. Calcium chelators, phospholipase A(2) inhibitors, and lipoxygenase inhibitors effectively blocked LPA-stimulated H(2)O(2) release, whereas cyclooxygenase inhibitors were without effect. Addition of 5-lipoxygenase products 5-hydroperoxyeicosatetraenoic acid (5-HPETE) and leukotriene B(4), but not 5-hydroxyeicosatetraenoic acid (5-HETE) and leukotriene C(4), restored LPA-stimulated H(2)O(2) release in cells treated with the lipoxygenase inhibitors nordihydroguaiaretic acid and Zileuton. These results suggest that the lipoxygenase products 5-HPETE and leukotriene B(4) are required for LPA-stimulated H(2)O(2) release in HaCaT cells." @default.
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- W2023705247 date "2000-03-15" @default.
- W2023705247 modified "2023-09-26" @default.
- W2023705247 title "Involvement of lipoxygenase in lysophosphatidic acid-stimulated hydrogen peroxide release in human HaCaT keratinocytes" @default.
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- W2023705247 doi "https://doi.org/10.1042/0264-6021:3460751" @default.
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