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Revista da Associação Médica Brasileira

versão impressa ISSN 0104-4230

Resumo

TORRES, Sueli Maria Preda dos Santos et al. Breast histomorphometry of rats treated with estrogen and/or progestogen. Rev. Assoc. Med. Bras. [online]. 2011, vol.57, n.2, pp.177-181. ISSN 0104-4230.  http://dx.doi.org/10.1590/S0104-42302011000200015.

OBJECTIVE: To evaluate the breast histomorphometric changes in rats treated with estrogen and/or progestogen for a short period of time. METHODS: 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). RESULTS: 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). CONCLUSION: Estradiol and progestogen had a proliferative effect on mammary parenchyma. However, prior estradiol administration changes the progestogen action on rat mammary tissue.

Palavras-chave : Breast; rats; estradiol; medroxyprogesterone 17-acetate; hormone replacement therapy.

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