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• W2024754304 abstract "Bile acid transfer from the fetus to maternal bile was studied using in situ perfused rat placenta on day 21 of gestation and a fluorescent derivative of glycocholate (GC): cholylglycylamido-fluorescein (FITC-GC). Single-pass perfusion of the placenta with 0.25 mumol FITC-GC via the umbilical artery over 5 min was followed by the output of 6 per cent of this amount in maternal bile collected over the ensuing 120 min. This amount was reduced (-35 per cent) by simultaneous administration of 2.5 mumol GC through the jugular vein of the mother. This inhibition was stronger (-73 per cent) when 2.5 mumol GC was co-infused with FITC-GC through the umbilical artery. These results suggested that FITC-GC was, at least in part, transported by bile acid carriers across both the liver and the placenta. Using isolated perfused rat livers obtained from female virgin or 21-day pregnant rats, a slight increase in the residence time of FITC-GC in the liver of pregnant rats was found. However, no change in the ability of the liver to take up FITC-GC was observed. By contrast, when FITC-GC was injected into the left jugular vein of anaesthetized pregnant rats, a delayed plasma disappearance of this compound was seen, which may have been due in part to the existence of a transient and reversible FITC-GC exchange with the placental-fetal compartment. The maximal rate of FITC-GC output into bile after FITC-GC administration (1 mumol/100 g body weight) to pregnant rats was approximately 0.2 mumol/min, while maximal FITC-GC bile output was approximately 1 nmol/min when this compound was given through the umbilical artery (2.5 mumol). Therefore, the rate of FITC-GC output into bile was considered to reflect the rate of transfer across the placenta. Using this approach no saturation but rather a linear regression (slope = 1.1 microliters/min, p < 0.05) was found between placental transfer and placental perfusate concentrations in the 10-1000-mumol/l FITC-GC range. In summary, the in situ perfused rat placenta is a useful model to study the fetal excretion of cholephilic compounds, and transfer across the trophoblast would be the limiting step in the excretion of fetal bile acids by the placenta-maternal liver tandem." @default.
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• W2024754304 title "Fetal excretion of the fluorescent bile acid derivative cholylglycylamido-fluorescein (FITC-GC) by the rat placenta-maternal liver tandem" @default.
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• W2024754304 doi "https://doi.org/10.1016/s0143-4004(98)90107-2" @default.
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