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- W1993227355 abstract "Microsomal membranes sedimented at 40 000 g were prepared from human myometrium samples. The progesterone binding properties of microsomal suspensions were determined by incubating microsomes and [3H]progesterone at 4 degrees C. Dextran-coated charcoal was used for the separation of bound and free steroids. Membrane-associated progesterone binding sites of high affinity were identified in microsomes prepared from pregnant and nonpregnant uteri. The binding was saturable (Kd approximately 4 X 10(-9) M, concentration of binding sites 400-900 fmol/mg microsomal protein) and specific for natural progesterone. Of 21 steroids tested only 21-hydroxy-4-pregnene-3,20-dione, 17 alpha-hydroxyprogesterone and testosterone showed moderate competition against progesterone with relative affinities between 7.0-20.0% (R.A. of progesterone 100%). 5 alpha-Dihydroprogesterone and 5 alpha-dihydrotestosterone showed weak cross reaction (relative affinities 2.5 and 2.0%, respectively). Corticosteroids, estrogens and the 5 synthetic progestins tested showed only weak competition with relative affinities lower than 1.0%. These microsomal progesterone binding sites of high affinity and limited capacity resemble steroid hormone receptors but they are different from the soluble cytosolic progesterone receptor of human uterus in terms of steroid specificity. The physiological function of this microsomal progesterone receptor is unknown." @default.
- W1993227355 created "2016-06-24" @default.
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- W1993227355 date "1984-02-01" @default.
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- W1993227355 title "High affinity progesterone binding sites of human uterine microsomal membranes" @default.
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- W1993227355 doi "https://doi.org/10.1016/0022-4731(84)90125-0" @default.
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