Deciduomal Response in Prepuberal Rats Adrenalectomized Ovariectomized at Different Ages of Early Postnatal Life(Endocrinology)
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概要
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The possible effects of extraovarian estrogen on the development of the uterine capacity to form deciduomata were studied. Prepuberal rats adrenalectomized-ovariectomized on Days 5, 10 and 19 (AX-OX rats) were maintained on increasing doses (1-10 μg) of aldosterone until weaning on Day 22. The AX-OX rats, except for those operated on Day 19, were given daily injections of 0.05 fig estradiol-17β(E_2) for 2 days from Day 17, followed by 7 daily injections of 3 mg progesterone(P) commencing on Day 20. In a further group ovariectomized on Day 19, the adrenals were left intact (OX rats). The AX-OX rats operated on Day 19 and the OX rats were not primed with E_2 but likewise given 7 daily injections of P. On the 3rd day of the period of P injections, all the rats (AX-OX and OX) received a single injection of 0.1 μg E_2 and 16 hr later an intraluminal oilinstillation. When sacrificed on the day following the last P injection, deciduomata were developed in all the animals. Regardless of the age at operation, the size of the response in the AX-OX rats was approximately twice as large as that in the OX rats with their adrenals intact. Furthermore, 5 daily injections of 1 μg MER-25 or 0.01 μg E_2 from Day 6 onward failed to alter the incidence and size of deciduomal response in rats adrenalectomized-ovariectomized on Day 5. These results suggest that endogenous estrogen is not needed for the development of the capacity of the uterus to form deciduomata during neonatal life.
- 社団法人日本動物学会の論文
- 1985-02-15
著者
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Ohta Yasuhiko
Department Of Biology Faculty Of General Education Tottori University
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Ohta Yasuhiko
Department O Fbiology School Of General Education Tottori University
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