Abstract
Sphingosine-1-phosphate (S1P) is a bioactive lipid molecule. It stimulates the growth of some cells, but inhibits the growth of others. In this study, we describe the detection of sub-μM to μM concentrations of S1P in the ascitic fluids of patients with ovarian cancer. In ovarian cancer cells cultured in vitro, S1P exhibited a dual effect on growth and/or survival. S1P (10 μM) induced cell death when cells were in suspension but stimulated cell growth when cells were attached. The calcium-dependent induction of cell death by S1P is apparently associated with its inhibitory effect on cell attachment and cell adhesion. S1P (10–30 μM) also induced calcium-dependent cell-cell aggregation.
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