P2Y Purinoceptor Mediates Ca2+ Signaling in Duodenocytes and Involves Duodenal Mucosal Bicarbonate Secretion

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P2Y receptors mediate Ca2+ signaling in duodenocytes and contribute to duodenal mucosal bicarbonate secretion.

Since little is known about the role of P2Y receptors (purinoceptors) in duodenal mucosal bicarbonate secretion (DMBS), we sought to investigate the expression and function of these receptors in duodenal epithelium. Expression of P2Y(2) receptors was detected by RT-PCR in mouse duodenal epithelium and SCBN cells, a duodenal epithelial cell line. UTP, a P2Y(2)-receptor agonist, but not ADP (10 m...

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P2Y receptors mediate Ca signaling in duodenocytes and contribute to duodenal mucosal bicarbonate secretion

Dong X, Smoll EJ, Ko KH, Lee J, Chow JY, Kim HD, Insel PA, Dong H. P2Y receptors mediate Ca signaling in duodenocytes and contribute to duodenal mucosal bicarbonate secretion. Am J Physiol Gastrointest Liver Physiol 296: G424–G432, 2009. First published December 12, 2008; doi:10.1152/ajpgi.90314.2008.—Since little is known about the role of P2Y receptors (purinoceptors) in duodenal mucosal bica...

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Peripheral melatonin mediates neural stimulation of duodenal mucosal bicarbonate secretion.

Melatonin is released from intestinal enterochromaffin cells and from the pineal gland, but its role in gastrointestinal function is largely unknown. Our aim was to study the involvement of intestinal and central nervous melatonin in the neurohumoral control of the duodenal mucosa-protective bicarbonate secretion. Working in anesthetized rats, we cannulated a 12-mm segment of duodenum with an i...

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Role of Ca2+-activated K+ channels in duodenal mucosal ion transport and bicarbonate secretion.

Stimulation of muscarinic receptors in the duodenal mucosa raises cytosolic free Ca(2+) concentration ([Ca(2+)](cyt)), thereby regulating duodenal epithelial ion transport. However, little is known about the downstream molecular targets that account for this Ca(2+)-mediated biological action. Ca(2+)-activated K(+) (K(Ca)) channels are candidates, but the expression and function of duodenal K(Ca...

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5-HT induces duodenal mucosal bicarbonate secretion via cAMP- and Ca2+-dependent signaling pathways and 5-HT4 receptors in mice.

In previous studies, we have found that 5-hydroxytryptamine (5-HT) is a potent stimulant of duodenal mucosal bicarbonate secretion (DMBS) in mice. The aim of the present study was to determine the intracellular signaling pathways and 5-HT receptor subtypes involved in 5-HT-induced DMBS. Bicarbonate secretion by murine duodenal mucosa was examined in vitro in Ussing chambers. 5-HT receptor invol...

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ژورنال

عنوان ژورنال: The FASEB Journal

سال: 2008

ISSN: 0892-6638,1530-6860

DOI: 10.1096/fasebj.22.1_supplement.1202.5