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• W2032471570 abstract "Cannabinoids bind to two G-protein-coupled receptors, CB1 and CB2, expressed by neurons and cells of the immune system, respectively. Glioma cells (astrocyte-derived brain tumor cells) express cannabinoid receptors, and numerous in vitro and in vivo studies performed in rodents have concluded that apoptosis could be induced by cannabinoids in these cells. Whether this also applies to human cells is controversial; we, therefore, assessed the effect of cannabinoids on human glioma cell viability with the human astrocytoma cell line U373MG. We report here that U373MG human glioma cells are sensitive only to high concentrations of cannabinoids (>5 μg/ml for Δ9-THC). Similar concentrations of the compounds promoted a rapid activation of extracellular-regulated kinase and c-Jun NH2-terminal kinase, suggesting that cannabinoid receptors are functional in U373MG cells. Nevertheless, these kinases are not involved in cannabinoid-induced cell death in U373MG cells, insofar as blocking their activation with specific inhibitors does not reduce cell death. CB1 is expressed in U373MG cells and is involved in cannabinoid-induced cell death, in that blocking its activation with a specific antagonist (AM251) almost totally prevented cell death following incubation of the cells with Δ9-THC. In addition, as already reported, some cannabinoids may have modest proproliferative properties in U373MG cells. Human U373MG glioma cells are sensitive only to very high, pharmacologically irrelevant concentrations of cannabinoids, so it seems unlikely that cannabinoids would constitute promising molecules for treating malignant astrocytoma; they do not induce glioma cell death at doses that could be applied safely to humans. © 2008 Wiley-Liss, Inc." @default.
• W2032471570 created "2016-06-24" @default.
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• W2032471570 date "2008-11-01" @default.
• W2032471570 modified "2023-09-25" @default.
• W2032471570 title "High concentrations of cannabinoids activate apoptosis in human U373MG glioma cells" @default.
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• W2032471570 doi "https://doi.org/10.1002/jnr.21757" @default.
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