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- W2574640481 abstract "Objective Sex hormone-binding globulin (SHBG) binds and transports testosterone and estradiol in plasma. The possibility that SHBG is a mixture of transporting proteins has been postulated. We analyzed in parallel the effects of obesity status on the levels and binding capacity of circulating SHBG and their relationship with testosterone and estradiol. Design Anthropometric measures and plasma were obtained from apparently healthy young (i.e. 35 ± 7 years) premenopausal women ( n = 32) and men ( n = 30), with normal weight and obesity (BMI >30 kg/m 2 ). Methods SHBG protein (Western blot), as well as the plasma levels of testosterone, estradiol, cortisol and insulin (ELISA) were measured. Specific binding of estradiol and testosterone to plasma SHBG was analyzed using tritium-labeled hormones. Results Significant differences in SHBG were observed within the obesity status and gender, with discordant patterns of change in testosterone and estradiol. In men, testosterone occupied most of the binding sites. Estrogen binding was much lower in all subjects. Lower SHBG of morbidly obese (BMI >40 kg/m 2 ) subjects affected testosterone but not estradiol. The ratio of binding sites to SHBG protein levels was constant for testosterone, but not for estradiol. The influence of gender was maximal in morbid obesity, with men showing the highest binding / SHBG ratios. Conclusions The results reported here are compatible with SHBG being a mixture of at least two functionally different hormone-binding globulins, being affected by obesity and gender and showing different structure, affinities for testosterone and estradiol and also different immunoreactivity." @default.
- W2574640481 created "2017-01-26" @default.
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- W2574640481 date "2017-04-01" @default.
- W2574640481 modified "2023-10-18" @default.
- W2574640481 title "Modulation of SHBG binding to testosterone and estradiol by sex and morbid obesity" @default.
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- W2574640481 doi "https://doi.org/10.1530/eje-16-0834" @default.
- W2574640481 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28077498" @default.
- W2574640481 hasPublicationYear "2017" @default.
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