Effects of postnatal administration of diethylstilbestrol on puberty and thyroid function in male rats.
To examine the effects of diethylstilbestrol (DES) on male pubertal development and thyroid function, juvenile male Sprague-Dawley rats were given DES daily by oral intubation at doses of 10, 20 and 40 microg/kg/day from postnatal day 33 for 20 days. Prepuce separation was significantly delayed at the dose of 20 microg/kg/day and above in the DES-treated rats. DES treatment induced a significant reduction in the weights of testes, epididymides, the ventral prostate, seminal vesicles plus coagulating glands and fluid, levator ani bulbocavernosus muscles, Cowper's glands and the glans penis. The weights of the liver and adrenals increased in the DES-treated animals. DES caused a dose-dependent reduction in germ cells; in particular the spermatids were mainly affected. The serum levels of testosterone and luteinizing hormone were significantly reduced in the DES-treated groups, but that of estradiol decreased. No differences were observed in the serum thyroxine levels of the control and DES-treated groups. In microscopic observation of the DES-treated animals, degeneration of germ cells and tubular atrophy in the testis were noted, but there were no microscopic changes in the thyroid. These results indicate that DES affected the pubertal development of juvenile male rats and that its mode of action may be related to alterations in hormone levels.
Shin
Jae-Ho
JH
Department of Biomedical Laboratory Science, College of Health Science, Eulji University, Kyonggido 461-713, Korea.
Kim
Tae Sung
TS
Kang
Il Hyun
IH
Kang
Tae Seok
TS
Moon
Hyun Ju
HJ
Han
Soon-Young
SY
D000311:Adrenal Glands / Q000033:anatomy & histology / Q000187:drug effects; D000818:Animals; D001284:Atrophy; D004054:Diethylstilbestrol / Q000494:pharmacology*; D004968:Estrogens, Non-Steroidal / Q000494:pharmacology*; D012739:Gonadal Steroid Hormones / Q000097:blood; D008099:Liver / Q000033:anatomy & histology / Q000187:drug effects; D008297:Male; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D012741:Sexual Maturation / Q000187:drug effects*; D013737:Testis / Q000187:drug effects / Q000473:pathology; D013961:Thyroid Gland / Q000187:drug effects* / Q000502:physiology; D013974:Thyroxine / Q000097:blood
D004968:Estrogens, Non-Steroidal; D012739:Gonadal Steroid Hormones; D004054:Diethylstilbestrol; D013974:Thyroxine