Regulatory effect of phorbol esters on sphingosine kinase in BALB/C 3T3 fibroblasts (variant A31): demonstration of cell type-specific response--a preliminary note - PubMed (original) (raw)
Regulatory effect of phorbol esters on sphingosine kinase in BALB/C 3T3 fibroblasts (variant A31): demonstration of cell type-specific response--a preliminary note
N Mazurek et al. Biochem Biophys Res Commun. 1994.
Abstract
Sphingosine-1-phosphate (Sph-1-P) has been implicated as a second messenger in control of cell motility and proliferation (e.g., Sadahira Y, et al., PNAS 89:9686, 1992; Olivera A & Spiegel S, Nature 365:557, 1993). The control mechanism for its synthesis, as catalyzed by sphingosine kinase, is crucial in signal transduction. Synthesis of Sph-1-P in Balb/c 3T3 fibroblasts (A31 variant) is strongly up-regulated by brief treatment of cells with 12-O-tetradecanoylphorbol-13-acetate (TPA). Level of Sph-1-P in PKC-depleted cells is 10-fold higher than in undepleted cells, and a further 5-fold increase occurs after treatment with TPA. In Swiss 3T3 and B16 melanoma cells, Sph-1-P level was unaffected by TPA treatment. Thus, the effect of TPA on Sph-1-P synthesis appears to be cell type-specific.
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