Effect of Adrenalectomy on Implantation in Pregnant Rats(Endocrinology)
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Female rats subjected to bilateral adrenalectomy 4 to 6 days prior to mating had smaller uteri showing a decrease in number of embryonic swellings when sacrificed on Day 15 of pregnancy as compared with the pregnant control rats with their adrenals intact. In these rats, ovaries were markedly reduced in weight with corpora lutea of pregnancy smaller in size than in the controls. However, the number of corpora lutea was not significantly different from that in the controls. By contrast, unilateral adrenalectomy prior to mating and bilateral adrenalectomy on Day 7 of pregnancy failed to exert any significant effect on neither the ovaries nor the uteri on Day 15. In rats with adrenocortical tissue reduced to a small piece prior to mating, the states of the ovaries and the uteri varied with the size of the fragments left in situ, being significantly affected only in females bearing the fragments below 20 mg in weight at autopsy. Therefore, the absence of or a decrease in adrenocortical tissue during early pregnancy seems to cause the derangements in the ovaries and the uteri in the operated rats. These findings also suggest that the reduction in number of fetal swellings in rats bilaterally adrenalectomized prior to mating results from the uterine dysfunction caused by a decrease in the production of ovarian hormones supportive of implantation. A marked increase in fetal mortality in the bilaterally adrenalectomized pregnant rats is also accounted for by inadequate hormone supply from the ovaries of reduced size. The data from the present studies appear to suggest that adrenalectomy interferes with implantation via the central nervous system regulating luteal function.
- 社団法人日本動物学会の論文
- 1985-08-15
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