Abstract
A nonestrogenic component of young, rapidly growing plants, 6-methoxybenzoxazolinone (6-MBOA), was examined to determine its effect on the reproductive responses of prepubertal and mature female rats. Prepubertal animals treated with a single injection of 6-MBOA or with Silastic capsules implanted for 3 days showed a significant increase in both ovarian and uterine weight. Serum luteinizing hormone was unaffected by 6-MBOA treatment for 3 days in 32-day-old animals, whereas serum follicle-stimulating hormone was elevated. Silastic capsule treatment of mature animals showed the following results. Extended treatment for 6 estrous cycles had no influence on the timing of vaginal cyclicity; despite this, 6-MBOA treatment for 2 cycles caused an increase in ovarian weight resulting from an increase in the number of corpora lutea per ovary. Animals treated for 1 cycle showed a significant increase in the number of ova shed. Uterine weight in mature animals did not increase. This study indicates that 6-MBOA has a stimulatory effect on the reproductive system of young and mature female rats. It is the first attempt to relate the effects of the compound on the endocrine system of any animal. That nonestrogenic plant compounds can trigger reproduction has important ecologic and physiologic significance.
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