Article (Scientific journals)
Mechanisms of Interaction of Endocrine-Disrupting Chemicals with Glutamate-Evoked Secretion of Gonadotropin-Releasing Hormone
Rasier, Gregory; Parent, Anne-Simone; Gerard, Arlette et al.
2008In Toxicological Sciences, 102 (1), p. 33-41
Peer Reviewed verified by ORBi
 

Files


Full Text
Rasier Tox Sciences 2008 postprint auteur.pdf
Author postprint (360.84 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Abstract :
[en] In previous studies, we detected a dichlorodiphenyltrichloroethane (DDT) derivative in the serum of children with sexual precocity after migration from developing countries. Recently, we reported that DDT stimulated pulsatile gonadotropin-releasing hormone (GnRH) secretion and sexual maturation in the female rat. The aim of this study was to delineate the mechanisms of interaction of endocrine-disrupting chemicals including DDT with GnRH secretion evoked by glutamate in vitro. Using hypothalamic explants obtained from 15-day-old female rats, estradiol (E2) and DDT caused a concentration-related increase in glutamate-evoked GnRH release while p,p'-dichlorodiphenyldichloroethene and methoxychlor had no effect. The effective DDT concentrations in vitro were consistent with the serum concentrations measured in vivo 5 days after exposure of immature rats to 10 mg/kg/day of o,p'-DDT. Bisphenol A induced some stimulatory effect, whereas no change was observed with 4-nonylphenol. The o,p'-DDT effects in vitro were prevented partially by a selective antagonist of the alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) subtype of glutamate receptors. A complete prevention of o,p'-DDT effects was caused by an estrogen receptor (ER) antagonist as well as an aryl hydrocarbon receptor (AHR) antagonist and inhibitors of protein kinases A and C and mitogen-activated kinases. While an intermittent incubation with E2 caused no change in amplification of the glutamate-evoked GnRH release for 4 h, continuous incubation with E2 or o,p'-DDT caused an increase of this amplification after 3.5 h of incubation. In summary, DDT amplifies the glutamate-evoked GnRH secretion in vitro through rapid and slow effects involving ER, AHR, and AMPA receptor mediation.
Disciplines :
Environmental sciences & ecology
Anatomy (cytology, histology, embryology...) & physiology
Author, co-author :
Rasier, Gregory ;  Université de Liège - ULiège > Département des sciences cliniques > Pédiatrie
Parent, Anne-Simone ;  Université de Liège - ULiège > Département des sciences cliniques > Pédiatrie
Gerard, Arlette ;  Centre Hospitalier Universitaire de Liège - CHU > Pédiatrie
Denooz, Raphael ;  Centre Hospitalier Universitaire de Liège - CHU > Toxicologie clinique
Lebrethon, Marie-Christine ;  Centre Hospitalier Universitaire de Liège - CHU > Pédiatrie
Charlier, Corinne  ;  Université de Liège - ULiège > Département de pharmacie > Chimie toxicologique
Bourguignon, Jean-Pierre ;  Université de Liège - ULiège > Département des sciences cliniques > Pédiatrie - IFRES
Language :
English
Title :
Mechanisms of Interaction of Endocrine-Disrupting Chemicals with Glutamate-Evoked Secretion of Gonadotropin-Releasing Hormone
Publication date :
March 2008
Journal title :
Toxicological Sciences
ISSN :
1096-6080
eISSN :
1096-0929
Publisher :
Oxford University Press, United Kingdom
Volume :
102
Issue :
1
Pages :
33-41
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
DG RDT - Commission Européenne. Direction Générale de la Recherche et de l'Innovation [BE]
BSGPE - Belgian Study Group for Pediatric Endocrinology [BE]
Fonds Léon Fredericq [BE]
Available on ORBi :
since 23 August 2010

Statistics


Number of views
138 (13 by ULiège)
Number of downloads
138 (3 by ULiège)

Scopus citations®
 
44
Scopus citations®
without self-citations
26
OpenCitations
 
40

Bibliography


Similar publications



Contact ORBi