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- W2071066088 abstract "Substantial extrasplanchnic metabolism of estrogens is known to occur in humans and dogs. As part of an investigation into the anatomic sites of such metabolism, the extraction of estrogens by the hind limb of the dog was studied during a constant infusion of [3H]estrone. Simultaneous femoral artery (A) and femoral vein (FV) plasma samples were obtained and analyzed for total radioactivity, unconjugated and conjugated radioactivity, for [3H]estrone and for its metabolites estradiol-17β, estrone sulfate and estrone glucosiduronate. The percent extraction across the hind limb was calculated [100(1-FV/A)]. The mean percent extraction ± SE of total, conjugated and unconjugated radioactivity was 31 ± 3.9, 27 ± 4.4 and 16 ± 3.7 respectively, indicating significant net uptake of these moieties by the hind limb (P<.01). Mean percent extractions ± SE for estrone and estradiol-17β were 40 ± 4.9 and 32 ± 2.7, indicating significant net uptake of these specific unconjugated estrogens by the hind limb (P<.01). The mean percent extraction of estrone glucosiduronate was 16 ± 3.1 indicating significant net uptake of this conjugate (P<.01). However, the mean percent extraction of estrone sulfate was negative (−12 ± 4.1) indicating net production of this conjugate by the hind limb (P<.01). Since the net uptake of total radioactivity cannot be explained on the basis of metabolism by the hind limb, the lymphatics were investigated as an alternate efferent pathway. In similar experiments the thoracic duct was cannulated, the estrogens in lymph were analyzed and compared with those in femoral artery plasma. Each estrogen measured in plasma appeared in lymph within 10 minutes following the start of the [3H]estrone infusion. The lymph/femoral artery concentration ratios reached a plateau at 70–100 minutes after the start of the infusion. The plateau concentrations were 20–70% of those in plasma. It is suggested that removal of estrogens in the lymph may account, in part at least, for the net uptake of total radioactivity across the hind limb calculated from the plasma data." @default.
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- W2071066088 date "1977-10-01" @default.
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- W2071066088 title "Extraction of estrogens by the hind limb of the dog. Evidence for entry into the lymphatics" @default.
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- W2071066088 doi "https://doi.org/10.1016/0039-128x(77)90093-9" @default.
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