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자료유형
학술저널
저자정보
Kim, Sung-Hyo (Department of Pharmacology, College of Pharmacy, Chung Ang University) Youm, Ji-Hyun (Department of Pharmacology, College of Pharmacy, Chung Ang University) Lee, Dong-Kyu (Department of Pharmacology, College of Pharmacy, Chung Ang University) Park, Sun-Young (Department of Pharmacology, College of Pharmacy, Chung Ang University) Shin, Chang-Yell (Department of Pharmacology, College of Pharmacy, Chung Ang University) Ryu, Jung-Su (Department of Pharmacology, College of Pharmacy, Chung Ang University) La, Hyen-O (Department of Pharmacology, College of Medicine, The Catholic University of Korea) Song, Hyun-Ju (Department of Pharmacology, College of Pharmacy, Chung Ang University) Min, Young-Sil (Department of Pharmacology, 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 제30권 제11호
발행연도
2007.1
수록면
1,419 - 1,425 (7page)

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We investigated the effects of hydrogen peroxide $(H_2O_2)$ on relaxation of the cat lower esophageal sphincter (LES). Vasoactive intestinal peptide (VIP) caused dose-dependent relaxation of LES, and $H_2O_2$ reduced VIP-induced relaxation. Relaxation was also attenuated by pertussis toxin (PTX), indicating a Gi/o component. VIP treatment increased $[^{35}S]GTP{\gamma}S$ binding to Gs and Gi3 protein, but not to Go, Gq, Gi1 or Gi2. This increase in Gs or Gi3 binding was reduced by $H_2O_2$. However, the relaxation induced by sodium nitroprusside (SNP), 3-morpholino sydnomine (SIN-1), 8-br cGMP (cGMP analog), forskolin (adenylate cyclase activator), and dibutyryl-cAMP (a stable cAMP analog) was not reduced by $H_2O_2$. These data suggest that $H_2O_2$ inhibits VIP-induced relaxation via a Gi-dependent pathway, perhaps by inhibiting the activation of $G_{i3}$ or Gs downstream of the VIP receptor and independent of cAMP or NO-cGMP signaling.

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