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• W2039778875 abstract "Estrogen reportedly facilitates visceral nociception at the spinal or supraspinal level. The present study was aimed to investigate whether estrogen modulates visceral pain through the vagal pathway. Ovariectomized rats received estradiol, which was administered subcutaneously (to act through both the vagal and spinal pathways) or intraduodenally (to preferentially act through the vagal pathway). Luminally applied estradiol induced a rapid and significant decrease in the visceromotor response to colorectal distension, with increased c-Fos expression in nodose ganglion neurons. Systemically injected estradiol increased visceromotor response and c-Fos expression in both nodose and dorsal root ganglion (T6-12) neurons. The antinociceptive effect of estrogen was abolished by surgical vagotomy or chemical denervation of vagal afferents. Both luminally and systemically administered estradiol elicited selective 5-hydroxytryptamine secretion from the duodenum. Granisetron, a 5-hydroxytryptamine 3 receptor antagonist, reversed the antinociceptive effect of estrogen. Intestinal mucosal mast cell stabilizers prevented estradiol-induced antinociception and 5-hydroxytryptamine secretion. Ultrastructural analysis revealed that estradiol caused piecemeal degranulation of intestinal mucosal mast cells. The actions of estradiol were inhibited by an estrogen receptor β antagonist and mimicked by an estrogen receptor β agonist. These results suggest that estrogen can trigger vagus-mediated antinociception, which is masked by its spinally mediated pronociception. Perspective This study is the first to show a vagus-mediated estrogenic antinociception, in which the nongenomic estrogen receptor β–mediated, intestinal mucosal mast cell–derived 5-hydroxytryptamine/5-hydroxytryptamine 3 receptor pathway is involved. This work may provide new insights into the sex hormone modulation of visceral sensitivity related to irritable bowel syndrome and indicate potential therapeutic targets to manage this disease." @default.
• W2039778875 created "2016-06-24" @default.
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• W2039778875 date "2014-02-01" @default.
• W2039778875 modified "2023-10-17" @default.
• W2039778875 title "Vagal Afferents Mediate Antinociception of Estrogen in a Rat Model of Visceral Pain: The Involvement of Intestinal Mucosal Mast Cells and 5-Hydroxytryptamine 3 Signaling" @default.
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• W2039778875 doi "https://doi.org/10.1016/j.jpain.2013.10.012" @default.
• W2039778875 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24231720" @default.
• W2039778875 hasPublicationYear "2014" @default.
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