連続照明下に於ける持続発情と下垂体前葉-卵巣系

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In order to clarify the effects of light on the sexual functions of matured female albino rats, we ufed Iwasaki's method for continuous illumination, and investigated the changes of vaginal smears, assayed the gonadotropic potencies of anterior pituitaries, and analized the histochemical properties of anterior pituitaries, ovaries and uteri. Persistent estrus began after 50 days, at least, of continuous illumination. As the histological changes of anterior pituitaries, so-called β-cells (PAS positive cells), increased in number, they became larger and more predominantly degranulated than normal control animals. Gonadotropic potencies of anterior pituitaries increased remarkably after 20 days of continuous illumination but decreased after 10 days, reaching a lower level than normal control animals. After 20-50 days of continuous exposure to light, the weight of ovaries increased to a considerable extent and histologically, fresh corpus-luteum formations were noted ; many growing follicles and some degenerated or atretic follicles were also observed within them. But in the ovaries of animals which were exposed continuously to light for 70 days, we could not recognize any corpus-luteum formations. However, we did observe many growing follicles and some degenerated or atretic follicles. From these experimental results, we can say that, at the early stage of continuous illumination, anterior pituitaries are dominantly accelerated on the point of release and during the production of gonadotropic hormones, especially FSH and LH, but the longtime exposure to continuous light favors a decrease of LH-release from anterior pituitaries and this decrease of LH secretion induces the FSH dominant condition in the qualitative characters of released gonadotropic hormones from anterior pituitaries. As for the result, this FSH dominant hormone-milieu also brings about the so-called "hyperestrinism" and continuous cornification of vaginal mucous membrane of rats, which were exposed to continuous light for a longtime.
日本内分泌学会の論文

連続照明下に於ける持続発情と下垂体前葉-卵巣系

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