1Alpha,25-dihydroxyvitamin D3 inhibits programmed cell death in HL-60 cells by activation of sphingosine kinase - PubMed (original) (raw)

. 1998 May 1;58(9):1817-24.

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• PMID: 9581819

1Alpha,25-dihydroxyvitamin D3 inhibits programmed cell death in HL-60 cells by activation of sphingosine kinase

B Kleuser et al. Cancer Res. 1998.

Abstract

Sphingolipid breakdown products [ceramide, sphingosine, and sphingosine-1-phosphate (SPP)] are emerging as a new class of bioactive molecules. In agreement with previous studies, treatment of human promyelocytic leukemia HL-60 cells with 1-alpha,25-dihydroxyvitamin D3 [1,25-(OH)2D3] induced a transient increase of ceramide levels within 2 h, which then returned to basal levels within 8 h. In contrast, sphingosine kinase activity increased more slowly and reached maximal levels only after 20 h of exposure, leading to a concomitant increase in SPP level. Unlike treatments with cell-permeable ceramide analogues or sphingomyelinase, which induce apoptosis, 1,25-(OH)2D3 did not induce apoptosis, despite the early formation of ceramide. Moreover, prolonged treatment of HL-60 cells with 1,25-(OH)2D3 suppressed ceramide-induced apoptosis. There was a correlation between the time course and dose response of the activation of sphingosine kinase by 1,25-(OH)2D3 and the protection against apoptosis. In contrast, treatment with all-trans-retinoic acid neither stimulated sphingosine kinase activity nor protected cells from ceramide-induced apoptosis. Treatment with SPP protected HL-60 cells from ceramide-induced apoptosis, and N,N-dimethylsphingosine (DMS), a competitive inhibitor of sphingosine kinase, prevented the survival effect of 1,25-(OH)2D3. The effect of DMS was counteracted by SPP, suggesting that SPP is a critical component of the cytoprotective effect of 1,25-(OH)2D3. Chelerythrine chloride, an inhibitor of protein kinase C, markedly reduced sphingosine kinase activity and the apoptosis-sparing effect of 1,25-(OH)2D3, and conversely, the tumor promoter 12-O-tetradecanoylphorhol-13-acetate not only suppressed ceramide-induced apoptosis but also stimulated sphingosine kinase activity. Moreover, the protective effect of 12-O-tetradecanoylphorbol-13-acetate was blocked by DMS. Collectively, our observations indicate that the cytoprotective effect of 1,25-(OH)2D3 is mediated by SPP, which is formed as a consequence of activation of sphingosine kinase.

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