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자료유형
학술저널
저자정보
Chung, Fa-Yong (Department of Pharmacology, College of Pharmacy, Chung Ang University) Song, Hyun-Ju (Department of Pharmacology, College of Pharmacy, Chung Ang University) Park, Sun-Young (Department of Pharmacology, College of Pharmacy, Chung Ang University) Jang, Hyeon-Soo (Department of Pharmacology, College of Pharmacy, Chung Ang University) Kim, Dong-Seok (Department of Bio-chemistry, College of Medicine, Chung Ang University) Sim, Sang-Soo (Department of Pathophysiology, College of Pharmacy, Chung Ang University) Sohn, Uy-Dong (Department of Pharmacology, College of Pharmacy, Chung Ang 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 제31권 제11호
발행연도
2008.1
수록면
1,437 - 1,445 (9page)

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Sphingosine 1-phosphate (S1P) is a bioactive lipid, stored and released from activated platelets, macrophages, and other mammalian cells. We previously reported that S1P induces esophageal smooth muscle contraction in freshly isolated intact cells. Here, we measured S1P-induced ERK1/2 activation and upstream signaling in cultured feline esophageal smooth muscle cells. Activation of ERK1/2 by S1P peaked at 5 min, was sustained up to 30 min, and was blocked by PTX. In contrast, S1P did not activate p38 MAPK or JNK. PTX inhibited S1P-induced ERK1/2 activation. We then used phospholipase inhibitors, DEDA for $PLA_2$, U73122 for PLC, and pCMB for PLD, to determine that ERK1/2 activation was downstream of PLC activation. The PKC inhibitors, GF109203X and chelerythrine, also suppressed ERK1/2 activation. Whereas the PTK inhibitor, genistein, partially inhibited ERK1/2 activation, the EGFR tyrosine kinase inhibitor, tyrphostin 51, had no effect. Taken together, S1P-induced ERK1/2 activation in cultured ESMCs requires a PTX-sensitive G protein, stimulation of the PLC pathway, and sub-sequent activation of the PKC and PTK pathways.

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