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Tamoxifen activates hypothalamic l-dopa synthesis to stimulate ovarian estrogen production in chicken.

Abstract：

:Estrogen is the primary sex hormone responsible for the development and modulation of the female reproductive system in all vertebrates including avian species. The actions of estrogen are mediated by the estrogen receptor, which could be modulated by the selective estrogen receptor modulator tamoxifen (TAM). In this study, we administered TAM into the actively laying chicken to investigate the ovarian and hypothalamic responses to the estrogen action blockage. The laying was disrupted and the development of the pre-ovulatory hierarchical follicles was arrested. However, the TAM treatment caused an increase of estrogen level in both serum and ovary. Among the main estrogen targeted tissues, the hypothalamus showed specific dopaminergic activation as indicated by gene expression analysis. In the ovary, l-dopa, the precursor of dopamine, could stimulate the estrogen synthesis in undifferentiated follicles but not in the differentiated pre-ovulatory follicles. Thus, we established a feedback loop links ovarian estrogen production with hypothalamic l-dopa synthesis and we propose that the dopamine is involved in estrogen action to regulate the ovarian follicle development and ovulation.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Mao Y,Wu X,An L,Li X,Li Z,Zhu G

doi

10.1016/j.bbrc.2018.01.182

subject

Has Abstract

pub_date

2018-02-19 00:00:00

pages

1257-1262

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(18)30211-0

journal_volume

496

pub_type

杂志文章

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