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- W2024581808 abstract "To assess the mechanism of β-cell lipotoxicity in comparison with Fas-mediated cell death, we used a mouse β-cell clone stably transfected with human Fas. Palmitate induced β-cell death in correlation with medium glucose levels between 5 and 20 mmol/l, while Fas-mediated cytotoxicity was observed irrespective of glucose concentration. At the glucose level of 10 mmol/l, palmitate induced caspase-6 activity within 3 h, and caspase-3 activity after a lag period of 6 h. The activities of caspases were correlated with glucose concentration. A caspase-6 inhibitor attenuated caspase-3 activation and cell death induced by palmitate. Oxfenicine, an inhibitor of carnitine palmitoyltransferase-1, attenuated both palmitate-induced cytotoxicity and activation of caspases. Finally, β-cell cytotoxicity caused by the combination of anti-Fas and palmitate at 25 mmol/l of glucose was greater than the sum of those induced by each. These observations suggest that palmitate induces sequential activation of caspase-6 and caspase-3 through a mitochondrial signal(s), and caspase-6 plays a primary role in the mechanism. Fas-mediated β-cell death and lipotoxicity may share common mechanisms involving caspase activation, and thereby synergistically inducing β-cell death, although upstream signaling pathways are distinct." @default.
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- W2024581808 date "2006-08-01" @default.
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- W2024581808 title "Sequential activation of caspases and synergistic β-cell cytotoxicity by palmitate and anti-Fas antibodies" @default.
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- W2024581808 doi "https://doi.org/10.1016/j.lfs.2006.03.048" @default.
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