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• W2012364604 abstract "Avaliar as alterações histomorfométricas nas mamas de ratas tratadas com estrogênio e/ou progestagênio por curto período de tempo. Foram divididas em quatro grupos 40 ratas ooforectomizadas: GC-recebeu veículo; GE-recebeu benzoato de estradiol (37,6 μg/animal); GP-recebeu acetato de medroxiprogesterona (11,28 mg/animal) e, GEP-recebeu benzoato de estradiol (37,6 μg/animal) e acetato de medroxiprogesterona (11,28 mg/ animal). No grupo GE, o estradiol foi administrado durante sete dias, por via subcutânea. Já no grupo EP o estradiol foi administrado nos primeiros sete dias e o progestagênio por mais 23 dias, por via subcutânea. Vinte e quatro horas após a última administração dos hormônios, os animais foram anestesiados e o primeiro par de mamas inguinais removido, imerso em formaldeído a 10% e processado para inclusão em parafina, sendo os cortes corados pela Hematoxilina-Eosina. Foram avaliadas a morfologia e a área ocupada pelo parênquima mamário, sendo os dados submetidos à análise de variância complementado pelo teste de Kruskal-Wallis (p < 0,05). As mamas no grupo-controle apresentaram-se atrofiadas, sendo que, nos animais dos grupos GE e GEP, nota-se a presença de alvéolos típicos contendo secreção no seu interior, já nos animais tratados somente com progestagênio (GP) notam-se alvéolos formados por células volumosas que ocupam praticamente todo o lúmen alveolar. A morfometria mostrou haver maior área de parênquima mamário nos animais tratados com hormônios (GE = GP > GEP > GC; p < 0,05) O estradiol e o progestagênio apresentaram efeito proliferativo no parênquima mamário. No entanto, a administração prévia de estradiol modifica a ação do progestagênio no tecido mamário da rata. To evaluate the breast histomorphometric changes in rats treated with estrogen and/or progestogen for a short period of time. Forty oophorectomized rats were divided into four groups: GC, vehicle; GE, treated with estradiol benzoate (37.6 mg/animal); GP, treated with medroxyprogesterone acetate (11.2 mg/animal) and GEP, treated with estradiol benzoate (37.6 mg/animal) plus medroxyprogesterone acetate (11.28 mg/animal). In GE group, estradiol was administered subcutaneously for seven days; in GEP group, estradiol was administered once in a day for the first seven days and the progestogen over the next 23 days both subcutaneously. Twenty-four hours after the last hormone administration, the animals were killed upon deep anesthesia and the first inguinal breasts were removed, fixed in 10% formaldehyde and processed to be included in paraffin, with the sections being stained by hematoxylin-eosin. Morphology and the area occupied by mammary parenchyma were assessed, with the data undergoing analysis of variance followed by the Kruskal-Wallis test (p < 0.05). The control group breasts were found atrophic and, in GE and GEP group animals, typical alveoli with secretion inside are present; in progestogen-treated animals (GP), alveoli formed by large cells occupying almost the entire alveolar lumen are noted. Morphometric analysis showed a larger mammary parenchyma area in hormone-treated animals (GE = GP > GEP > GC; p < 0.05). Estradiol and progestogen had a proliferative effect on mammary parenchyma. However, prior estradiol administration changes the progestogen action on rat mammary tissue." @default.
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• W2012364604 date "2011-03-01" @default.
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• W2012364604 title "Histomorfometria da mama de ratas tratadas com estrogênio e/ou progestagênio" @default.
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