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N, N-dimethyl-D-erythro-sphingosine Increases Intracellular Ca2+ Concentration via Na+-Ca2+-exchanger in HCT116 Human Colon Cancer Cells

N, N-dimethyl-D-erythro-sphingosine Increases Intracellular Ca2+ Concentration via Na+-Ca2+-exchanger in HCT116 Human Colon Cancer Cells

Hyo-Lim Kim, Dong-Soon Im

Arch Pharm Res. 2008 Jan;31(1):54-9.

PMID: 18277608

Abstract:

N,N-dimethyl-D-erythro-sphingosine (DMS), an N-methyl derivative of sphingosine, is an inhibitor of protein kinase C (PKC) and sphingosine kinase (SK). In previous reports, DMS-induced intracellular Ca2+ increase concentration ([Ca2+]i) was studied in T lymphocytes, monocytes, astrocytes and neuronal cells. In the present study, we studied DMS-induced increase of [Ca2+]i in HCT116 human colon cancer cells. We found that the DMS-induced increase of [Ca2+]i in colon cancer cells is composed of Ca2+ release from intracellular Ca2+ stores and subsequent Ca2+ influx. The Ca2+ release is not related to modulation of inositol 1,4,5-trisphosphate (IP3) receptor or ryanodine receptor. On the other hand, the Ca2+ influx is mediated largely through Ca2+ channels sensitive to verapamil, nifedipine, Ga3+, and La3+. Furthermore, we found that the response is inhibited by bepridil and Ni2+, specific inhibitors of Na+-Ca2+-exchanger, suggesting involvement of Na+-Ca2+ exchanger in the DMS-induced [Ca2+]i increase in colon cancer cells. This inhibition was also observed in U937 monocytes, but not in 1321N1 astrocytes.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR4244220	N-(NBD-Aminolauroyl)sphingosine β-D-lactosyl			Price

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