Dimethylsphingosine Regulates Intracellular pH and Ca2+ in Human Monocytes

Journal of Pharmacological Sciences

Fumikazu Okajima³  Dong-Soon Im¹  Jae-Ho Kim²  Young-Jin Im¹  Yun-Kyung Lee¹  Eun-Hee Lee¹ 

[1] Laboratory of Pharmacology, College of Pharmacy and Research Institute for Drug Development, Pusan National University, Korea;Department of Physiology, College of Medicine, Pusan National University, Korea;Laboratory of Signal Transduction, Institute for Molecular and Cellular Regulation, Gunma University, Japan

关键词: dimethylsphingosine;    pH;    sphingosine;    calcium;    signal transduction;   

DOI  :  10.1254/jphs.FPJ05009X

学科分类：药学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(31)Cited-By(11)Dimethylsphingosine (DMS) was first reported as an inhibitor of protein kinase C and later has been used as a specific inhibitor of sphingosine kinase. Furthermore, its anti-cancer effect has become a basis for development of chemotherapy. Nevertheless, its anti-neoplastic mechanism has poorly been understood. In the present study, we observed that DMS increased intracellular pH and Ca2+ concentration in U937 human monocytes. To further characterize these DMS-induced actions, we employed structurally-related sphingolipids and specific pharmacological tools such as inhibitors of protein kinase C and Na+/H+ exchanger and found that the two responses of DMS were mimicked by four stereoisomers of sphingosine and two isomers to dihydrosphingosine, but not with sphingosine 1-phosphate, sphingosyl-phosphorylcholine, and C2-ceramide. Furthermore, DMS-induced pH increase was independent of Na+/H+ exchanger activity. We also characterized the interrelationship between DMS-induced pH increase and DMS-induced Ca2+ increase. Since DMS is considered to be a good anti-cancer candidate, our characterization of DMS actions provides useful information for development of DMS chemotherapy.

【 授权许可】

Unknown