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자료유형
학술저널
저자정보
권태훈 (중앙대학교) 정현우 (중앙대학교) 조은정 (중앙대학교) 정지훈 (중앙대학교) 손유동 (중앙대학교)
저널정보
한국분자세포생물학회 Molecules and Cells Molecules and Cells 제38권 제7호
발행연도
2015.7
수록면
616 - 623 (8page)

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P2 receptors are membrane-bound receptors for extracel-lular nucleotides such as ATP and UTP. P2 receptors have been classified as ligand-gated ion channels or P2X receptors and G protein-coupled P2Y receptors. Recently, purinergic signaling has begun to attract attention as a potential therapeutic target for a variety of diseases especially associated with gastroenterology. This study determined the ATP and UTP-induced receptor signaling mechanism in feline esophageal contraction. Contraction of dispersed feline esophageal smooth muscle cells was measured by scanning micrometry. Phosphorylation of MLC20 was determined by western blot analysis. ATP and UTP elicited maximum esophageal contraction at 30 s and 10μM concentration. Contraction of dispersed cells treated with 10μM ATP was inhibited by nifedipine. However, contraction induced by 0.1μM ATP, 0.1μM UTP and 10μM UTP was decreased by U73122, chelerythrine, ML-9, PTX and GDPβS. Contraction induced by 0.1μM ATP and UTP was inhibited by Gαi3 or Gαq antibodies and by PLCβ1 or PLCβ3 antibodies. Phosphorylated MLC20 was increased by ATP and UTP treatment. In conclusion, esophageal contraction induced by ATP and UTP was preferentially mediated by P2Y receptors coupled to Gαi3 and Gαq proteins, which activate PLCβ1 and PLCβ3. Subsequently, increased intracellular Ca2+ and activated PKC triggered stimulation of MLC kinase and inhibition of MLC phosphatase. Finally, increased pMLC20 generated esophageal contraction.

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