Developmental changes in hypothalamic SF-1, POMC, and ERα mRNA expression and their sensitivity to fasting in male and female rats.

Abstract:

:Estrogen plays pivotal roles in body weight regulation through its effects on central estrogen receptor-α (ERα) expression. ERα is found on neurons that express the hypothalamic anorexigenic factors steroidogenic factor-1 (SF-1) and pro-opiomelanocortin (POMC) mediate these effects of estrogen. As the gonadal hormonal milieu is drastically altered during the developmental period, the expression levels of SF-1 and POMC might also change during this period. In this study, we showed that hypothalamic SF-1 and ERα mRNA expression did not change during the neonatal to pre-pubertal period (from postnatal day 10 to 30), and there were no significant differences in the hypothalamic mRNA expression levels of these molecules between males and females at any examined age. On the other hand, hypothalamic POMC mRNA expression and the serum estradiol (E2) level increased during development in both males and females. Significant positive correlations were detected between the serum E2 level and hypothalamic POMC mRNA expression in both males and females. Hypothalamic ERα and POMC mRNA expression were decreased by fasting in male rats at all examined ages, whereas fasting had no effect on hypothalamic ERα or POMC mRNA expression in the female rats. These results indicate that the regulatory system involving E2 and hypothalamic POMC expression might already be established in the neonatal period and that the roles of POMC and ERα in body weight regulation during development might differ slightly between males and females.

journal_name

Endocr J

journal_title

Endocrine journal

authors

Iwasa T,Matsuzaki T,Mayila Y,Yano K,Irahara M

doi

10.1507/endocrj.EJ17-0140

subject

Has Abstract

pub_date

2017-12-28 00:00:00

pages

1157-1163

issue

12

eissn

0918-8959

issn

1348-4540

journal_volume

64

pub_type

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