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In this study, we examined the role of autophagy in the initiation of lipid increases in renal epithelial HK2 cells. We found that trivalent chromium [Cr(III)] induced autophagy by activating sphingomyelin phosphodiesterase 2 (SMPD2). SMPD2 increases levels of ceramide and other lipids. Confocal immunofluorescence microscopy showed that signals of ceramide overlapped with LC3, suggesting that ceramide...
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