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- W2082811557 abstract "Abstract: Melatonin, an indolamine mainly produced in the pineal gland, has received a great deal of attention in the last decade because of its oncostatic effects, which are due to its immunomodulatory, antiproliferative, antioxidant and its possible antiangiogenesis properties. Herein, we document its antiproliferative action on human umbilical vein endothelial cells (HUVECs). Moreover, the possible cell signaling pathways when melatonin inhibited HUVEC proliferation were explored in this study. Primary HUVECs were isolated, cultured, purified and identified before the studies were performed. HUVECs were found to possess G‐protein‐coupled membrane receptors for melatonin (MT1 and MT2) and also nuclear melatonin receptors (RORα and RORβ, especially RORβ). No obvious expression of RORγ was found. We investigated the membrane receptors and several intracellular signaling pathways including mitogen‐activated protein kinases (MAPK)/extracellular signal‐related kinases (ERK), phosphoinositol‐3‐kinase (PI3K)/Akt and protein kinases C (PKC) involved in antiproliferative action of melatonin on HUVECs. The blockade of these pathways using special inhibitors decreased cell growth. Furthermore, the constitutive activation of nuclear factor kappa B (NF‐κB) contributed to the proliferation of HUVECs. High concentrations of melatonin inhibited both NF‐κB expression and its binding ability to DNA, possibly through inactivation of ERK/Akt /PKC pathways. Taken together, high concentrations of melatonin markedly reduced HUVEC proliferation; the antiproliferative action of melatonin was closely correlated with following pathway: melatonin receptors/ERK/PI3K/Akt/PKC/ NF‐κB." @default.
- W2082811557 created "2016-06-24" @default.
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- W2082811557 date "2007-09-24" @default.
- W2082811557 modified "2023-10-13" @default.
- W2082811557 title "Intracellular signaling pathways involved in cell growth inhibition of human umbilical vein endothelial cells by melatonin" @default.
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- W2082811557 doi "https://doi.org/10.1111/j.1600-079x.2007.00496.x" @default.
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