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자료유형
학술저널
저자정보
Lee, Dong Kyu (Department of Pharmacology, College of Pharmacy, Chung-Ang University) Min, Young Sil (Department of Pharmaceutical Engineering, College of Convergence Science and Technology, Jung Won University) Yoo, Seong Su (Department of Pharmacology, College of Pharmacy, Chung-Ang University) Shim, Hyun Sub (Department of Pharmacology, College of Pharmacy, Chung-Ang University) Park, Sun Young (Department of Pharmacology, College of Pharmacy, Chung-Ang University) Sohn, Uy Dong (Department of Pharmacology, College of Pharmacy, Chung-Ang University)
저널정보
한국응용약물학회 Biomolecules & Therapeutics(구 응용약물학회지) Biomolecules & therapeutics 제26권 제6호
발행연도
2018.1
수록면
546 - 552 (7page)

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A comprehensive collection of proteins senses local changes in intracellular $Ca^{2+}$ concentrations ($[Ca^{2+}]_i$) and transduces these signals into responses to agonists. In the present study, we examined the effect of sphingosine-1-phosphate (S1P) on modulation of intracellular $Ca^{2+}$ concentrations in cat esophageal smooth muscle cells. To measure $[Ca^{2+}]_i$ levels in cat esophageal smooth muscle cells, we used a fluorescence microscopy with the Fura-2 loading method. S1P produced a concentration-dependent increase in $[Ca^{2+}]_i$ in the cells. Pretreatment with EGTA, an extracellular $Ca^{2+}$ chelator, decreased the S1P-induced increase in $[Ca^{2+}]_i$, and an L-type $Ca^{2+}$-channel blocker, nimodipine, decreased the effect of S1P. This indicates that $Ca^{2+}$ influx may be required for muscle contraction by S1P. When stimulated with thapsigargin, an intracellular calcium chelator, or 2-Aminoethoxydiphenyl borate (2-APB), an $InsP_3$ receptor blocker, the S1P-evoked increase in $[Ca^{2+}]_i$ was significantly decreased. Treatment with pertussis toxin (PTX), an inhibitor of $G_i$-protein, suppressed the increase in $[Ca^{2+}]_i$ evoked by S1P. These results suggest that the S1P-induced increase in $[Ca^{2+}]_i$ in cat esophageal smooth muscle cells occurs upon the activation of phospholipase C and subsequent release of $Ca^{2+}$ from the $InsP_3$-sensitive $Ca^{2+}$ pool in the sarcoplasmic reticulum. These results suggest that S1P utilized extracellular $Ca^{2+}$ via the L type $Ca^{2+}$ channel, which was dependent on activation of the $S1P_4$ receptor coupled to PTX-sensitive $G_i$ protein, via phospholipase C-mediated $Ca^{2+}$ release from the $InsP_3$-sensitive $Ca^{2+}$ pool in cat esophageal smooth muscle cells.

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