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• W1963589760 endingPage "31" @default.
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• W1963589760 abstract "Purinergic agonists regulate mucin secretion in the airway epithelial cells. This study examined the effects of the apical application of purinergic agonists on Ca2+ influx ([Ca2+]i), and mucin secretion along with their underlying signaling pathway in normal human middle ear epithelial (NHMEE) cells. The apical membrane of NHMEE cells were stimulated with various purinergic agonists, including UTP, and the [Ca2+]i was measured using a miniature Ussing double perfusion chamber. P2Y2 receptor in NHMEE cells was also localized by immunohistochemistry. UTP-induced mucin secretion was quantified by an immunoblotting assay. The order of the purinergic agonist potency with respect to [Ca2+]i determined in this study was ATP = UTP > 2-MeSATP > UDP ≫ adenosine which is consistent with that obtained from P2Y2 receptor activation. The P2Y2 receptor is expressed in the apical membrane of monolayered cultured NHMEE cells. Apical UTP-induced [Ca2+]i was inhibited by 2-aminoethoxydiphenyl borate (2-APB) but not by ryanodine. UTP-induced mucin secretion was inhibited by a Ca2+ chelating agent, BAPTA-AM, and was stimulated by ionomycin. UTP-induced mucin secretion was also suppressed by U73122 and 2-APB, while Calphostin C suppressed it to a small extent and PD98059 was ineffective. Caffeine also inhibited the UTP-induced [Ca2+]i and mucin secretion. These results suggest that the P2Y2 receptor is expressed in NHMEE cells, and plays a major role in modulating the [Ca2+]i from the IP3-sensitive intracellular Ca2+ store. UTP-induced mucin secretion in NHMEE cells is strongly dependent on Ca2+- and IP3." @default.
• W1963589760 created "2016-06-24" @default.
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• W1963589760 date "2005-11-01" @default.
• W1963589760 modified "2023-09-29" @default.
• W1963589760 title "P2Y2 agonist induces mucin secretion via Ca2+- and inositol 1,4,5-triphosphate-dependent pathway in human middle ear epithelial cells" @default.
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• W1963589760 doi "https://doi.org/10.1016/j.heares.2005.05.012" @default.
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