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- W2007533101 abstract "Oestrogen receptor protein (ER) was detected in 9 of 11 samples of malignant breast tissue and 8 of 9 samples of normal breast tissue. Levels of cytosolic ER (ERc) in malignant breast were 21-1102 fmol mg-1 soluble protein (Kd 1.8 X 10(-9)-3.1 X 10(-8) mol l-1) and those of nucleosolic ER (ERn), 13-526 fmol mg-1 soluble protein (Kd 2.1 X 10(-9)-1.4 X 10(-8) mol l-1). In normal breast tissue ERc levels were 33-640 fmol mg-1 soluble protein (Kd 1.3 X 10(-10)-3.2 X 10(-9) mol l-1), ERn was detected in only 2 samples, 8 and 87 fmol mg-1 soluble protein with Kd 3.2 X 10(-9) and 1.4 X 10(-9) l mol-1 respectively. 17 alpha-ethinyl-13 beta-ethyl-17 beta-hydroxy-4,15-gonadiene-3-one (gestodene), a new synthetic progestogen displaced 3H-oestradiol (3H-E2) from both ERc and ERn in malignant tissue but not in normal breast, or these receptors from endometrial tissue. In competition studies gestodene was approximately 3 times more effective in displacing 3H-E2 from ERc and ERn in malignant breast tissue than the natural ligand. Quantitation of ER by gestodene were ERc, 12-1134 fmol gestodene bound mg-1 soluble protein (Kd 1 X 10(-9)-8.1 X 10(-9) mol l-1); ERn, 17-531 fmol gestodene bound mg-1 soluble protein (Kd 1.6 X 10(-9)-1.1 X 10(-8) mol l-1). L-13-ethyl-17 alpha-ethinyl, 17 beta-hydroxy-gonen-3-one (levonorgestrel) showed no binding to ER in malignant breast, normal breast or endometrial tissue. In circulation both gestodene and levonorgestrel displaced E2 from sex hormone binding globulin more than any of the androgens tested. These results suggest that gestodene is a progestogen with oestrogenic and/or antioestrogenic properties and provide strong evidence for differences in ER from malignant and normal breast tissue." @default.
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- W2007533101 date "1986-09-01" @default.
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- W2007533101 title "Differences in oestrogen receptors in malignant and normal breast tissue as identified by the binding of a new synthetic progestogen" @default.
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- W2007533101 doi "https://doi.org/10.1038/bjc.1986.196" @default.
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