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Relationship between occupied form of nuclear estrogen receptor and cytosolic progesterone receptor of dna synthesis in uteri of estradiol implanted rats


, : Relationship between occupied form of nuclear estrogen receptor and cytosolic progesterone receptor of dna synthesis in uteri of estradiol implanted rats. Revista Espanola de Fisiologia 43(4): 401-406

The effect of 17 .beta.-estradiol (E2) implantation on the cytosolic progesterone receptor (RcP), DNA and occupied form of nuclear estrogen receptor (o-Rn) content in the uterus of ovariectomized adult rats, is described. Animals were implanted with oil or E2-oil solution in Silastic capsules. The latter group animals were divided into two subgroups: in subgroup (a), capsules remained in situ until decapitation time. In subgroup (b) they were removed 48 h after implantation. The E2 implantation caused a significant increase in uterine weight, RcP and o-Rn content 48 h later. However, the DNA content increased significantly only after 72 h, but there was no significant difference in the t-Rn concentration in relation to the non-estrogenized animals. In subgroup (a) animals, these values remained unchanged until 96 h. In subgroup (b), the removal of E2 implants 48 h later caused an almost complete return of the values before the E2 implantation in terms of uterine weight, RcP and o-Rn content. However, the DNA concentration remained higher and the t-Rn level was lower than those values that were obtained for the non-estrogenized rats. These results suggest that the RcP and DNA synthesis induced by E2 would be connected to the level of o-Rn, although a closer dependency over time seems to exist between the o-Rn and RcP levels than between the o-Rn and DNA concentrations.

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Accession: 006297908

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