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Gastric 17β-estradiol in portal vein and liver Esr1 make a circadian rhythm in systemic circulation in male rats

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Abstract

The hemodynamics of 17β-estradiol (E2) synthesized and secreted from the stomach has been revealed gradually. This study aimed to clarify the circadian rhythm of E2 synthesis and secretion in the stomach, and the relationship between the expression of hepatic estrogen receptor (ER) α and serum E2 levels in systemic circulation. Wistar male rats were maintained in a room with a 12-h light and 12-h dark cycle (lights on from 0700 to 1900 h), and were sacrificed at every 4-hour interval starting at 0800 h. The results showed that the expression of gastric Cyp19a1 was higher in nighttime than in daytime, and that the portal venous E2 level was 2.2 times higher at 2400 h than that at 1200 h. The arterial E2 level was also the highest at 2400 h, and showed an apparent circadian rhythm positively correlated with portal venous E2 levels. Conversely, the expression of liver Esr1 peaked at 1200 h and turned to decrement at 2400 h. The population of immunoreactive nuclei with ERα antibody decreased at 2400 h compared with that at 1200 h. The regression analysis showed that the liver Esr1 mRNA was negatively correlated to portal venous and arterial E2 levels. It could be concluded that the circadian rhythm of the systemic E2 level depended both on the amounts of gastric E2 in the portal vein and on the Esr1 expression in the liver.

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Acknowledgments

We acknowledge Mr. Nathan Strenge (Tokai University Yamagata Senior High School) for his suggestions and critically reading the manuscript.

Funding

This work was supported by the Life Science Laboratory Research Grant (Grant Numbers K14G05, K15G05) and the Yuki Plan of Yamagata University (Grant Number DAY0010).

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Correspondence to Hiroto Kobayashi.

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The authors declare that there is no conflict of interest that would prejudice the impartiality of this research work.

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Kobayashi, H., Yoshida, S., Sun, YJ. et al. Gastric 17β-estradiol in portal vein and liver Esr1 make a circadian rhythm in systemic circulation in male rats. Endocrine 53, 565–573 (2016). https://doi.org/10.1007/s12020-016-0971-0

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  • DOI: https://doi.org/10.1007/s12020-016-0971-0

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