Document Detail

Restoration of dioxin-induced damage to fetal steroidogenesis and gonadotropin formation by maternal co-treatment with α-lipoic acid.
MedLine Citation:
PMID:  22911699     Owner:  NLM     Status:  MEDLINE    
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD), an endocrine disruptor, causes reproductive and developmental toxic effects in pups following maternal exposure in a number of animal models. Our previous studies have demonstrated that TCDD imprints sexual immaturity by suppressing the expression of fetal pituitary gonadotropins, the regulators of gonadal steroidogenesis. In the present study, we discovered that all TCDD-produced damage to fetal production of pituitary gonadotropins as well as testicular steroidogenesis can be repaired by co-treating pregnant rats with α-lipoic acid (LA), an obligate co-factor for intermediary metabolism including energy production. While LA also acts as an anti-oxidant, other anti-oxidants; i.e., ascorbic acid, butylated hydroxyanisole and edaravone, failed to exhibit any beneficial effects. Neither wasting syndrome nor CYP1A1 induction in the fetal brain caused through the activation of aryl hydrocarbon receptor (AhR) could be attenuated by LA. These lines of evidence suggest that oxidative stress makes only a minor contribution to the TCDD-induced disorder of fetal steroidogenesis, and LA has a restorative effect by targeting on mechanism(s) other than AhR activation. Following a metabolomic analysis, it was found that TCDD caused a more marked change in the hypothalamus, a pituitary regulator, than in the pituitary itself. Although the components of the tricarboxylic acid cycle and the ATP content of the fetal hypothalamus were significantly changed by TCDD, all these changes were again rectified by exogenous LA. We also provided evidence that the fetal hypothalamic content of endogenous LA is significantly reduced following maternal exposure to TCDD. Thus, the data obtained strongly suggest that TCDD reduces the expression of fetal pituitary gonadotropins to imprint sexual immaturity or disturb development by suppressing the level of LA, one of the key players serving energy production.
Takayuki Koga; Takumi Ishida; Tomoki Takeda; Yuji Ishii; Hiroshi Uchi; Kiyomi Tsukimori; Midori Yamamoto; Masaru Himeno; Masutaka Furue; Hideyuki Yamada
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-07-20
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-08-22     Completed Date:  2013-04-19     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e40322     Citation Subset:  IM    
Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan.
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MeSH Terms
Antioxidants / pharmacology*
Brain / drug effects,  metabolism
Fetal Development / drug effects,  genetics
Fetus / drug effects*,  metabolism*
Gonadotropins / genetics,  metabolism*
Maternal Exposure
Receptors, Aryl Hydrocarbon / metabolism
Signal Transduction / drug effects
Teratogens / toxicity*
Tetrachlorodibenzodioxin / toxicity*
Thioctic Acid / pharmacology*
Reg. No./Substance:
0/Antioxidants; 0/Gonadotropins; 0/Receptors, Aryl Hydrocarbon; 0/Teratogens; 1746-01-6/Tetrachlorodibenzodioxin; 62-46-4/Thioctic Acid

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