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• W2065043080 abstract "The concentration of testosterone in saliva is probably in equilibrium with the concentration of cellular exchangeable testosterone in salivary gland, and these pools are a function of hormone transplant from the plasma compartment, and hormone metabolism in salivary gland cells. Both of these processes were examined in the present study using the carotid injection technique in normal and pilocarpine-stimulated ketamine-anesthetized rats. Both testosterone and estradiol were rapidly transported across salivary gland capillaries in vivo from the circulating albumin-bound pool. Estradiol, but not testosterone, was also rapidly transported into salivary gland from the circulating human sex hormone-binding globulin-bound pool. Hormone transport was several-fold greater than the capillary transport of [3H]bovine albumin, indicating that bound hormone was available for transport across salivary gland capillaries via an enhanced dissociation mechanism, with the plasma protein primarily residing in the plasma compartment. This result was confirmed by thaw-mount autoradiography, which showed diffuse distribution of [3H]testosterone in salivary gland, but vascular retention of [3H]bovine albumin. The concentration of exchangeable cellular testosterone in rat saliva was less than 4% of the total or plasma exchangeable testosterone in the rat. This marked discrepancy between the concentration of plasma and cellular exchangeable hormone suggested that there was rapid metabolism of androgen by salivary gland in vivo. This was confirmed by chromatographic separation of [3H] testosterone and labeled metabolites in homogenates of salivary gland. By 60 sec after injection, approximately 30% of the radioactivity in the salivary gland was in the form of androgen metabolites, which primarily comigrated with an androstenedione standard. The data indicate that albumin-bound testosterone, albumin-bound estradiol, and sex hormone-binding globulin-bound estradiol are all exchangeable in salivary gland capillaries. The low concentration of cellular exchangeable testosterone in salivary gland appears to be due to rapid tissue metabolism of this hormone. Thus, changes in androgen metabolism may alter salivary gland hormone concentrations independent of any change in the concentration of biologically active hormone in plasma." @default.
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• W2065043080 date "1986-07-01" @default.
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• W2065043080 title "Serum Bioavailability and Tissue Metabolism of Testosterone and Estradiol in Rat Salivary Gland*" @default.
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• W2065043080 doi "https://doi.org/10.1210/jcem-63-1-20" @default.
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