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Current Pharmaceutical Design

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ISSN (Print): 1381-6128
ISSN (Online): 1873-4286

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Review Article

Roles of Up-Regulated Expression of ASIC3 in Sex Difference of Acid-Induced Duodenal HCO3 - Responses

Author(s): Koji Takeuchi*, Yumi Ohashi and Kikuko Amagase

Volume 26, Issue 25, 2020

Page: [3001 - 3009] Pages: 9

DOI: 10.2174/1381612826666200417170319

Price: $65

Abstract

Although the morbidity of ulcers is statistically higher in males than females, the mechanism of this difference remains unknown. Recent studies show that duodenal HCO3 - response to mucosal acidification is higher in females than males, and this may be a factor responsible for the sex difference in the mucosal protective mechanisms. In this article, we examined the duodenal HCO3 - responses to various stimuli in male and female rats, including estrogen, and reviewed the mechanisms responsible for the sex difference in the acid-induced HCO3 - secretion. Mucosal acidification was performed by exposing the duodenum to 10 mM HCl for 10 min. PGE2 was administered intravenously, while capsaicin was applied topically to the duodenum for 10 min. Tamoxifen was given s.c. 30 min before the acidification. Ovariectomy was performed 2 weeks before the experiments; half of the animals were given estrogen i.m. after the operation. Mucosal acidification increased duodenal HCO3 - secretion in male rats, and this response was inhibited by indomethacin and sensory deafferentation. Although no sex difference was found in HCO3 - responses to PGE2 and capsaicin, the response to acid was significantly greater in female than male rats. The different HCO3 - response to acid disappeared on ovariectomy, and this effect was totally reversed by the repeated administration of estrogen. The gene expression of ASIC3 in female rats was greater than in male rats and down-regulated by ovariectomy or tamoxifen treatment in an estradiol- dependent manner, while no sex difference was observed in TRPV1 and CFTR expressions. In conclusion, the acid-induced HCO3 - response is greater in female than male rats, and this phenomenon is not due to changes in PGE2 sensitivity or TRPV1/CFTR expressions but may be accounted for by increased expression of ASIC3 on sensory neurons, which is associated with the chronic influence of estrogen.

Keywords: Duodenal HCO3 - secretion, sex difference, mucosal acidification, estrogen, capsaicin-sensitive afferent neuron, ASIC3, rat.

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