Document Detail

The pesticide heptachlor affects steroid hormone secretion in isolated follicular and luteal cells of rat.
MedLine Citation:
PMID:  16861048     Owner:  NLM     Status:  MEDLINE    
Heptachlor, a chlorinated hydrocarbon pesticide, suppresses the production of progesterone and estradiol in the female rat in vivo or in isolated ovaries in vitro. In this study the effect of heptachlor on steroid hormone production by isolated rat luteal and follicular cells, in the presence of two precursor hormones was investigated. Ovaries were isolated from anesthetized mature normocyclic virgin rats (3 to 4 months old), under sterile conditions. Corpora lutea and follicles were microscopically dissected out and separately enzymatically dispersed with collagenase at 37 degrees C. Viable cells collected after centrifugation were used at a concentration of approximately 2.5 x 10(5) cells/10 mL. Both luteal and follicular cell preparations were separately incubated overnight (15 h) at 37 degrees C in the presence of pregnenolone (P5) and androstenedione (A4) at a concentration of 6.0 nmol/L each, and heptachlor at either 0.12 microg/mL (low dose) or 1.20 microg/mL (high dose) (test cells) or in the absence of heptachlor (control cells). At the end of the incubations, progesterone and estradiol 17beta levels were analyzed in the incubation media. The results indicate that heptachlor significantly suppressed the production of both progesterone and estradiol in both cell types in a dose related manner even in the presence of A4 and P5 as precursor hormones (P<0.05).
J A Oduma; D Oduor Okelo; H Odongo; D W Makawiti
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Publication Detail:
Type:  Journal Article     Date:  2006-06-27
Journal Detail:
Title:  Comparative biochemistry and physiology. Toxicology & pharmacology : CBP     Volume:  144     ISSN:  1532-0456     ISO Abbreviation:  Comp. Biochem. Physiol. C Toxicol. Pharmacol.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-09-05     Completed Date:  2006-11-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100959500     Medline TA:  Comp Biochem Physiol C Toxicol Pharmacol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  76-84     Citation Subset:  IM    
Reproductive Biology Unit, Department of Veterinary Anatomy and Physiology, University of Nairobi, Nairobi, Kenya.
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MeSH Terms
Androstenedione / pharmacology
Cells, Cultured
Estradiol / biosynthesis
Heptachlor / toxicity*
Insecticides / toxicity*
Luteal Cells / drug effects*,  metabolism
Ovarian Follicle / cytology,  metabolism*
Pregnenolone / pharmacology
Progesterone / biosynthesis
Rats, Sprague-Dawley
Reg. No./Substance:
0/Insecticides; 145-13-1/Pregnenolone; 50-28-2/Estradiol; 57-83-0/Progesterone; 63-05-8/Androstenedione; 76-44-8/Heptachlor

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