Navegando por Palavras-chave "Oestradiol"

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    Ação dos esteroides ovarianos sobre a quantidade dos glicosaminoglicanos sulfatados e do ácido hialurônico nas mamas de ratas ovariectomizadas
    (Universidade Federal de São Paulo (UNIFESP), 2016-11-17) Torres, Sueli Maria Preda dos Santos [UNIFESP]; Simoes, Manuel de Jesus [UNIFESP]; http://lattes.cnpq.br/5987164343458678; http://lattes.cnpq.br/2539410198240163; Universidade Federal de São Paulo (UNIFESP)
    The extracellular matrix (ECM) act an essential role in the function of mammary epithelial cells and glycosaminoglycans have long been attracting clinical interest in all areas of medicine for their important role in cell recognition, migration, cell proliferation and differentiation. OBJECTIVE: Evaluate the morphology and the concentration of glycosaminoglycans in the breast of female rats treated with estrogen and/or progesterone. MATERIAL AND METHODS: Sixty female rats were divided into six groups with 10 animals each: G1 (5 months) and GII (18 months) in the proestrus phase were treated with vehicle; the other animals were ovariectomized, and immediately after were treated with vehicle (GC) or with hormones ? (GE) treated with oestradiol benzoate (37.6 mg/animal); (GP) ? treated with medroxyprogesterone acetate (11.28 mg/animal) and (GEP) ? treated with oestradiol benzoate (37.6 mg/animal), more medroxyprogesterone acetate (11.28 mg/animal). In the GE group, the oestradiol was administered subcutaneously for seven days; in the GP group, the progestogen was administered subcutaneously for 23 dats; in the GEP group, the oestradiol was administered once a day in the first seven days and the progestogen throughout the next 23 days, subcutaneously. Twenty four hours after the last administration of hormones, the animals were euthanized, and the first pairs of inguinal breasts were removed, part of them being fixated in formaldehyde at 10% (morphological evaluation) and the other part submerged in acetone (evaluation of the glycosaminoglycans). The material destined to the morphology was included in paraffin, and the cuts were stained by hematoxylin-eosin. The material destined to the biochemistry was processed to the electrophoresis in agarose gel to sulfated GAGs analysis, and the hyaluronic acid was analyzed with a Elisa-Like fluorimetric method. The statistical analysis was made by the analysis of variance (ANOVA) followed by the Bonferroni test (p<0.05). RESULTS: The breasts of the groups with ovaries (GI and GII) as well as the ovariectomized control group (GC) have shown to be atrophic, wherein we observed typical alveoli with secretion in the lumen in the groups (GE) and (GEP); yet in the animals treated with progestogen (GP), we noticed alveoli formed basically by cells that occupied almost all the alveolar light. In relation to the data of the sulfated glycosaminoglycans we noticed higher concentration in the oophorectomized group (GC) due to high concentration of dermatan sulfate (GC = GE > GP = GEP > GII = GI; p<0.05). And in relation to the hyaluronic acid we found higher concentration in the animals of five months (GI > GII, GC, GE, GEP > GP; p<0.005).CONCLUSION: Oestradiol and progesterone had a trophic effect in the breast parenchyma. However, the administration of oestradiol beforehand changes the action of progesterone in the rat?s mammary tissue.
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    Lower follicular fluid vitamin D concentration is related to a higher number of large ovarian follicles
    (Elsevier Sci Ltd, 2018) Antunes, Roberto A.; Mancebo, Ana C. A.; Reginatto, Mila W.; Deriquehem, Vitor A. S.; Areas, Patricia; Bloise, Enrrico; Chiamolera, Maria I. [UNIFESP]; Ribeiro, Gabriel C. M.; Carvalho, Alysson R. S.; Souza, Maria C. B.; Ortiga-Carvalho, Tania M.
    Vitamin D receptor-knockout mice fail to produce mature oocytes, indicating vitamin D is crucial for folliculogenesis in mice. However, the actions of vitamin D during folliculogenesis remain unknown. This prospective study aimed to assess whether follicular fluid (FF) vitamin D (25OHD3) concentrations are related to specific responses to ovarian stimulation. Women undergoing ovarian stimulation for IVF participated in the study. FF 25OHD3 concentrations were assessed in the first follicle aspirate on oocyte retrieval day. Oestradiol and progesterone concentrations were assessed on the trigger day. K-means grouping analysis showed that 25OHD3 FF concentrations clustered into a higher and lower group (mean +/- SEM 17.4 +/- 6.61 ng/ml and 35.5 +/- 7.17 ng/ml, respectively, P < 0.001). The clusters were analysed according to the oestradiol and progesterone concentrations, follicle number and size and resulting oocyte number and maturity. The FF 25OHD3 concentrations were no different among the infertility diagnoses. The lower 25OHD3 group had more follicles (>= 16.0 mm, P = 0.009) and higher serum oestradiol concentrations (P < 0.03) on the day of HCG administration. In this study, lower follicular 25OHD3 concentrations predicted a better response to ovarian stimulation shown by a greater production of larger follicles and higher serum oestradiol concentrations. (c) 2017 Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved.