Deciduoma Formation in Pseudopregnant Rats Bearing Pituitary Grafts(Endocrinology)
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概要
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Decidual cell reaction was investigated in the uterus of adult rats of the T strain receiving a single pituitary gland each under the renal capsule at 3 months of age. The females with the grafts invariably showed repetitive pseudopregnancies characterized by prolonged, diestrous vaginal smears having copious mucus and activated corpora lutea in the ovaries. The mean length of vaginal cycles was 16.3 and 18.7 days in the pituitary-grafted rats until ovariectomy at ages of 4 and 5 months, respectively. The pituitary grafts equally showed a marked immunohistochemical staining of prolactin in all experimental groups. The decidual response to uterine traumatization was markedly reduced in the pituitary-grafted rats given a 7-day treatment with progesterone alone or in combination with a small amount of estrogen commencing after ovariectomy. By contrast, the control rats bearing isografts of submaxillary glands exhibited 4-day cycles regularly, and always responded positively to the trauma, forming massive deciduomata. These findings indicate that the repetitive pseudopregnacies result in a decline in the uterine reactivity to trauma in the pituitary-grafted rats. Ovariectomy at the time of grafting greatly elevated incidence of deciduomata in the pituitary-grafted rats. The present study suggests that the lowered deciduogenic ability of the pituitary-grafted rats exhibiting the repetitive pseudopregnancies is largely ascribable to the continued exposure of the uterus to ovarian steroids, progestin in particular, rather than to prolactin secreted from the pituitary grafts.
- 社団法人日本動物学会の論文
- 1991-02-15
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