Seasonal changes of androgen receptor, estrogen receptors and aromatase expression in the medial preoptic area of the wild male ground squirrels (Citellus dauricus Brandt)

  • F. Zhang Beijing Forestry University, China.
  • J. Wang Beijing Forestry University, China.
  • Y. Jiao Beijing Forestry University, China.
  • L. Zhang Beijing Forestry University, China.
  • H. Zhang Beijing Forestry University, China.
  • X. Sheng Beijing Forestry University, China.
  • Y. Han Beijing Forestry University, China.
  • Z. Yuan Beijing Forestry University, China.
  • Q. Weng | qiangweng@bjfu.edu.cn Beijing Forestry University, China.

Abstract

The wild ground squirrel is a typical seasonal breeder. In this study, using RT-PCR, western blot and immunohistochemistry, we investigated the mRNA and protein expressions of androgen receptor (AR), estrogen receptors α and β (ERα and ERβ) and aromatase cytochrome P450 (P450arom) in the medial preoptic area (MPOA) of hypothalamus of the wild male ground squirrel during the breeding season (April), the non-breeding season (June) and pre-hibernation (September). AR, ERα, ERβ and P450arom protein/mRNA were present in the MPOA of all seasons detected. The immunostaining of AR and ERα showed no significant changes in different periods, whereas ERβ and P450arom had higher immunoreactivities during the breeding season and pre-hibernation when compared to those of the non-breeding season. Consistently, both the protein and mRNA levels of P450arom and ERβ were higher in the MPOA of pre-hibernation and the breeding season than in the non-breeding season, whereas no significant difference amongst the three periods was observed for AR and ERα levels. These findings suggested that the MPOA of hypothalamus may be a direct target of androgen and estrogen. Androgen may play important regulatory roles through its receptor and/or the aromatized estrogen in the MPOA of hypothalamus of the wild male ground squirrels.

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Published
2016-05-02
Section
Original Papers
Supporting Agencies
Beijing Natural Science Foundation (Grant-in-Aid #8142029), National Natural Science Foundation of China (#J1310005).
Keywords:
AR, ERα, ERβ, ground squirrel, MPOA, P450arom.
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How to Cite
Zhang, F., Wang, J., Jiao, Y., Zhang, L., Zhang, H., Sheng, X., Han, Y., Yuan, Z., & Weng, Q. (2016). Seasonal changes of androgen receptor, estrogen receptors and aromatase expression in the medial preoptic area of the wild male ground squirrels (Citellus dauricus Brandt). European Journal of Histochemistry, 60(2). https://doi.org/10.4081/ejh.2016.2621