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- W1519150778 abstract "An in vivo human chorionic gonadotropin (hCG)-receptor complex was solubilized from the subcellular fraction of ovarian and testicular tissues of rats that had been injected with 125-I-labeled hCG. The soluble hCG-receptor complex was partially characterized by Sepharose 6B chromatography in the presence of the nonionic detergent, Emulphogene, and was shown to have a molecular size of about 65 A. By this method it was also shown that the in vivo uptake of radioactivity by rat gonadal tissues represents 125-I-hCG and not the dissociated subunits or degradation products of the hormone. A soluble hCG-receptor complex isolated in vitro in approximately the same yield from both rat testicular and ovarian homogenates was shown to be the same size. The hCG-receptor appears to be specifically located in gonadal tissue; a corresponding hCG-receptor complex was not obtained from liver or kidney that incorporated significant levels of 125-I-hCG administered in vivo. Furthermore, a desialyzed hCG-receptor complex was obtained from rat testis but not liver; desialyzed hCG, like other desialyzed glycoproteins, is nonspecifically bound by rat liver homogenates. The binding of hCG and luteinizing hormone (LH) by rat testis receptor exhibits a high degree of specificity. Other glycoprotein hormones without LH activity, such as follicle-stimulating hormone and thyroid-stimulating hormone, and glycoproteins such as fetuin or alpha1-acid glycoprotein do not bind to the hCG/LH receptors. Desialyzed hCG was 2 times more effective in competing for binding to rat testis receptors than native hCG, indicating that caution must be exercised when the radioligand receptor assay is utilized to assay hCG preparations varying in sialic acid content." @default.
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- W1519150778 date "1975-05-01" @default.
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- W1519150778 title "Human chorionic gonadotropin. V. Tissue specificity of binding and partial characterization of soluble human chorionic gonadotropin-receptor complexes." @default.
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- W1519150778 doi "https://doi.org/10.1016/s0021-9258(19)41474-9" @default.
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