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논문 기본 정보

자료유형
학술저널
저자정보
Chang, Young-Ja (Laboratory of Pharmacology, College of Pharmacy and Research Institute for Drug Development, Pusan National University) Lee, Yun-Kyung (Laboratory of Pharmacology, College of Pharmacy and Research Institute for Drug Development, Pusan National University) Lee, Eun-Hee (Laboratory of Pharmacology, College of Pharmacy and Research Institute for Drug Development, Pusan National University) Park, Jeong-Ju (Division of Molecular Life Sciences, Pohang University of Sciecne and Technology) Chung, Sung-Kee (Division of Molecular Life Sciences, Pohang University of Sciecne and Technology) Im, Dong-Soon (Laboratory of Pharmacology, College of Pharmacy and Research Institute for Drug Development, Pusan National University)
저널정보
대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제29권 제8호
발행연도
2006.1
수록면
657 - 665 (9page)

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We recently reported that dimethylsphingosine (DMS), a metabolite of sphingolipids, increased intracellular pH and $Ca^{2+}$ concentration in U937 human monocytes. In the present study, we found that dimethylphytosphingosine (DMPH) induced the above responses more robustly than DMS. However, phytosphingosine, monomethylphytosphingosine or trimethylsphingosine showed little or no activity. Synthetic C3 deoxy analogues of sphingosine did show similar activities, with the C16 analogue more so than C18. The following structure-activity relationships were observed between DMS derivatives and the intracellular pH and $Ca^{2+}$ concentrations in U937 monocytes; 1) dimethyl modification is important for the DMS-induced increase of intracellular pH and $Ca^{2+}$, 2) the addition of an OH group on C4 enhances both activities, 3) the deletion of the OH group on C3 has a negligible effect on the activities, and 4) C16 appears to be more effective than C18. We also found that W-7, a calmodulin inhibitor, blocked the DMS-induced pH increase, whereas, KN-62, ML9, and MMPX, specific inhibitors for calmodulin-dependent kinase II, myosin light chain kinase, and $Ca^{2+}$-calmodulin-dependent phosphodiesterase, respectively, did not affect DMS-induced increases of pH in the U937 monocytes.

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