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- W2065399078 abstract "The ceramide analogue 1-phenyl-2-(decanoylamino)-3-morpholino-1-propanol (PDMP) (particularly the D-threo isomer, D-PDMP) caused inhibition of cell growth in some types of cells, and this growth-inhibitory effect has been attributed to inhibition of UDP-Glc:Cer beta-Glc transferase, resulting in reduced glycolipid synthesis and increased free ceramide [Inokuch, J., & Radin, N. S. (1987) J. Lipid Res. 28, 565-571; Okada, Y., et al. (1988) FEBS Lett. 235, 25-29]. In view of increasing evidence that the T cell proliferative immune response is modulated by glycosphingolipids (GSLs), the reagent D-PDMP was used to evaluate the role of GSLs in this respect. Con A induced or PHA-induced mitogenesis of C3H/HeJ mouse splenocytes, as well as IL2-dependent CTLL cell growth, were strongly inhibited in a dose-dependent manner when cells were preincubated in the presence of 5-10 microM D-PDMP, but not with its stereoisomer L-PDMP. Closely associated with this growth-inhibitory effect in the presence of D-PDMP, levels of essentially all GSLs, including GM3 and other gangliosides, were greatly reduced, whereas ceramide accumulated. Importantly, metabolically labeled radioactive bands, corresponding to free sphingosine and N-monomethylsphingosine, were found to be present in very small quantities (5-12%) relative to the band corresponding to N,N-dimethylsphingosine (DMS), which showed significant accumulation in D-PDMP-treated lymphocytes. The quantity of IL2 receptors and their affinity to IL2 on T cells did not change, but IL2-dependent tyrosine phosphorylation was greatly stimulated, following D-PDMP treatment.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2065399078 date "1990-07-03" @default.
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- W2065399078 title "A ceramide analog inhibits T cell proliferative response through inhibition of glycosphingolipid synthesis and enhancement of N,N-dimethylsphingosine synthesis" @default.
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- W2065399078 doi "https://doi.org/10.1021/bi00478a028" @default.
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