NDLI: Early Postnatal Exposure to a Low Dose of Decabromodiphenyl Ether Affects Expression of Androgen and Thyroid Hormone Receptor-Alpha and Its Splicing Variants in Mouse Sertoli Cells

Content Provider	PubMed Central
Author	Miyaso, Hidenobu Nakamura, Noriko Naito, Munekazu Hirai, Shuichi Matsuno, Yoshiharu Itoh, Masahiro Mori, Chisato
Editor	Volle, David H.
Copyright Year	2014
Abstract	Decabromodiphenyl ether (decaBDE) adversely affects reproduction and development. Our previous study showed that postnatal exposure to a low dose of decaBDE (0.025 mg/kg body weight/day) by subcutaneous injection on postnatal days (PNDs) 1 through 5 leads to reductions in testicular size and number of Sertoli cells and sperm, while higher dose of decaBDE (2.5 mg/kg body weight/day) had no significant differences about these. In the present study, we examined the molecular mechanism of these effects on mouse testes following postnatal exposure to a low decaBDE dose. We hypothesized that postnatal exposure to decaBDE may alter levels of serum thyroid hormones (THs) and testosterone, or the level of TH receptor alpha (Thra) transcripts and its splicing variants and androgen receptor (Ar) in Sertoli cells, adversely affecting spermatogenesis. To test this hypothesis, we examined serum TH and testosterone levels and the levels of transcripts of the Ar, Thra and its splicing variants, and Thra splicing factors (Hnrnpa1, Srsf1, and Hnrnph1) with qPCR in isolated mouse Sertoli cells exposed postnatally to decaBDE (0.025, 0.25, and 2.5 mg/kg). Levels of serum testosterone and transcripts encoding Ar, Thra, and its variant, Thra1, declined significantly in Sertoli cells of mice exposed to 0.025 mg decaBDE/kg. No significant differences in serum TH level or Thra2, Hnrnph1, or Srsf1 transcript levels were observed between control and decaBDE-exposed mice. However, the Thra1:Thra2 and Hnrnpa1:Srsf1 ratios were altered in Sertoli cells of mice exposed to 0.025 mg decaBDE/kg but not in cells exposed to 0.25 or 2.5 mg decaBDE/kg. These results indicate that postnatal exposure to a low dose of decaBDE on PNDs 1 through 5 lowers the testosterone level and the levels of Ar and Thra transcripts in Sertoli cells, accompanied by an imbalance in the ratios of Thra splicing variants, resulting in smaller testicular size and impaired spermatogenesis.
Related Links	http://dx.doi.org/10.1371/journal.pone.0114487
Starting Page	114487
File Format	PDF
ISSN	19326203
e-ISSN	19326203
Journal	PLoS ONE
Issue Number	12
Volume Number	9
Language	English
Publisher	Public Library of Science
Publisher Date	2014-12-01
Access Restriction	Open
Rights Holder	Public Library of Science
Subject Keyword	Biochemistry, Genetics and Molecular Biology(all) Agricultural and Biological Sciences(all) Medicine(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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