Navegando por Palavras-chave "Sex hormone-binding globulin"

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    Association between sex hormone-binding globulin (SHBG) and metabolic syndrome among men
    (Associação Paulista de Medicina - APM, 2014-01-01) Callou, Emmanuela Quental [UNIFESP]; Sá, Francisco Carleial Feijó de; Oliveira, Kelly Cristina de [UNIFESP]; Feres, Fausto; Verreschi, Ieda Therezinha do Nascimento [UNIFESP]; Universidade Federal do Ceará; Universidade Federal de São Paulo (UNIFESP); Instituto Dante Pazzanese de Cardiologia
    CONTEXT AND OBJECTIVE:Metabolic syndrome consists of a set of factors that imply increased risk of cardiovascular diseases. The objective here was to evaluate the association between sex hormone-binding globulin (SHBG), sex hormones and metabolic syndrome among men.DESIGN AND SETTING:Retrospective analysis on data from the study Endogenous oestradiol but not testosterone is related to coronary artery disease in men, conducted in a hospital in São Paulo.METHODS:Men (aged 40-70) who underwent coronary angiography were selected. The age, weight, height, waist circumference, body mass index and prevalence of dyslipidemia, hypertension and diabetes of each patient were registered. Metabolic syndrome was defined in accordance with the criteria of the Third Report of the National Cholesterol Education Program Expert Panel on Detection, Evaluation and Treatment of High Blood Cholesterol in Adults (NCEP-ATPIII). Serum samples were collected to assess the levels of glucose, total cholesterol, HDL-cholesterol (high density lipoprotein), triglycerides, albumin, SHBG, estradiol and total testosterone (TT). The levels of LDL-cholesterol (low density lipoprotein) were calculated using Friedewald's formula and free testosterone (FT) and bioavailable testosterone (BT) using Vermeulen's formula.RESULTS:141 patients were enrolled in the study. The prevalence of metabolic syndrome was significantly higher in the first SHBG tercile than in the second and third terciles. A statistically significant positive association between the SHBG and TT values was observed, but no such association was seen between SHBG, BT and FT.CONCLUSION:Low serum levels of SHBG are associated with higher prevalence of metabolic syndrome among male patients, but further studies are required to confirm this association.
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    Interferência da cimetidina na histofisiologia androgênica de epidídimos de ratos
    (Universidade Federal de São Paulo (UNIFESP), 2017-03-29) Santi, Fabiane de [UNIFESP]; Cerri, Estela Sasso [UNIFESP]; http://lattes.cnpq.br/4455630076841302; http://lattes.cnpq.br/6811833354624192; Universidade Federal de São Paulo (UNIFESP)
    Hormonal disorders and changes in the reproductive tract have been related to antiandrogenic effect of cimetidine. Thus, androgen-dependent structural and functional parameters of epididymis were investigated. Male rats received 100mg/kg cimetidine (CMTG) or saline (CG) for 50 days, and the epididymal cauda region was processed for light and transmission electron microscopy. Epididymal duct diameter and stromal collagen were evaluated. TUNEL-labeled epithelial cells, and AR, KPNA and SHBG immunolocalization were analyzed. In CMTG, the duct diameter reduced and a high number of TUNEL-labeled cells was associated to apoptotic features. In the epithelium, a weak/absent AR nuclear immunofluorescence was observed in contrast to enhanced AR-immunolabeled cytoplasm and reduced KPNA immunoreactivity. The collagen and SHBG levels reduced in the stroma. Cimetidine induced epithelial androgenic dysfunction due to impairment of AR nuclear import. These changes may be result of androgen unavailability in the stroma and/or to a direct cimetidine antiandrogenic effect on epithelial cells.
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    Testosterona, estradiol e doença arterial coronariana em homens adultos
    (Universidade Federal de São Paulo (UNIFESP), 2010-04-28) Callou, Emmanuela Quental [UNIFESP]; Verreschi, Ieda Therezinha do Nascimento [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Introduction: Cardiovascular diseases (CVDs) represent the main cause of death in Brazil, and among them especially the coronary artery diseases (CADs). Men present higher incidence and mortality rates for CAD than women. One of the explanations for this fact may be the possibly deleterious effect of testosterone on the male cardiovascular system and the protective effect of estradiol on the female cardiovascular system. However, recent studies in the literature indicate that testosterone has an either protective or neutral effect on the male cardiovascular system, while high levels of estradiol in men have been correlated to higher rates of morbidity and mortality from cardiovascular diseases. Objectives: To carry out a review of the literature regarding the relationship between testosterone and cardiovascular disease in men, to evaluate the existing relationships among total testosterone, bioavailable testosterone, free testosterone, free androgen index (FAI), sex hormone binding globulin, estradiol, free estrogen index (FEI), estradiol/testosterone ratio and FEI/FAI ratio and coronary artery disease in men; to understand the role of the sex hormone binding globulin as a new component of the metabolic syndrome. Material and Methods: The review of the literature regarding the relationship between testosterone and cardiovascular disease was performed using the PubMed database and the keywords testosterone and cardiovascular disease. The relationship between sex steroids and CAD was evaluated by a case-control study performed on men submitted to coronary angiography at the Instituto Dante Pazzanese de Cardiologia. The role of the sex hormone binding globulin (SHBG) as a new component of the metabolic syndrome was evaluated using the data obtained by the study “Estradiol but not Testosterone is Related to Coronary Artery Disease”. Results: The results were presented in three articles, namely: ARTICLE 1 - “Serum Testosterone and Cardiovascular Disease in Men”; ARTICLE 2 - “Estradiol but not Testosterone is Related to Coronary Artery Disease in Men”; ARTICLE 3 - (being prepared for submission) - “Sex hormone binding globulin, the novel component of metabolic syndrome?”. Conclusions: The studies retrieved from the literature which evaluated the relationship between testosterone and cardiovascular disease presented small numbers of participants and selected samples, which indicated the need for further studies to evaluate the role of testosterone in CVD in men. The findings presented suggest a positive correlation between estradiol and FEI levels with CAD. A neutral effect of total testosterone, bioavailable testosterone, free testosterone, free androgen index, SHBG, estradiol/testosterone ratio and FEI/FAI ratio on the incidence of this pathology was observed. Low levels of SHBG seem to correlate positively with the components of the metabolic syndrome, but further studies are necessary to evaluate this parameter as a new component of this syndrome.