Effect of atrazine on ovarian function in the rat

The effect of the chlorotriazine herbicide, atrazine, on ovarian function was studied in Long-Evans hooded (LE-hooded) and Sprague-Dawley (SD) rats. Atrazine was administered by gavage for 21 d to females displaying regular 4-d estrous cycles. In both strains, 75 mg/kg/d disrupted the 4-d ovarian cy...

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Bibliographic Details
Published in:Reproductive toxicology (Elmsford, N.Y.) N.Y.), 1996-07, Vol.10 (4), p.257-264
Main Authors: Cooper, Ralph L., Stoker, Tammy E., Goldman, Jerome M., Parrish, Michelle B., Tyrey, Lee
Format: Article
Language:English
Subjects:
Animals
atrazine
Atrazine - toxicity
Biological and medical sciences
chlorotriazines
estrogen
estrous cycle
Estrus - drug effects
Female
Herbicides - toxicity
Medical sciences
ovary
Ovary - drug effects
Ovary - physiology
Pesticides, fertilizers and other agrochemicals toxicology
progesterone
pseudopregnancy
rat
Rats
Rats, Sprague-Dawley
Toxicology
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Summary:The effect of the chlorotriazine herbicide, atrazine, on ovarian function was studied in Long-Evans hooded (LE-hooded) and Sprague-Dawley (SD) rats. Atrazine was administered by gavage for 21 d to females displaying regular 4-d estrous cycles. In both strains, 75 mg/kg/d disrupted the 4-d ovarian cycle; however, no distinct alteration (i.e., irregular cycles but not persistent estrus or diestrus) was apparent at this dose. At 150 mg/kg/d, atrazine induced repetitive pseudopregnancies in females of both strains. The highest dose tested (300 mg/kg/d) also induced repetitive pseudopregnancies in the SD females, while the ovaries of the LE-hooded female appeared regressed and the smear cytology was indicative of the anestrous condition. Although a NOAEL was not established, the doses employed in this experiment were in excess of those used in chronic feeding studies in which an early onset of mammary gland tumors was noted. These data demonstrate that atrazine can disrupt ovarian function and bring about major changes in the endocrine profile of the female.
ISSN:0890-6238
1873-1708
DOI:10.1016/0890-6238(96)00054-8