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• W2051229358 abstract "We established an isolated rat liver perfusion system for the study of heme catabolism. The liver of rats fasted for 48 h is perfused with an erythrocyte-free medium. Ultrastructural analysis shows integrity of all subcellular organelles with the exception of minor alterations in the rough endoplasmic reticulum. The perfused liver synthesizes serum proteins at a constant rate for 5 h. Albumin is secreted at a mean rate of 17 +/- 2 mg/h per 100 g liver, hemopexin at 5.0 +/- 0.7, haptoglobin at 3.2 +/- 0.6 and transferrin at 5.1 +/- 0.8 mg/h per 100 g liver. The mean ratio of ATP : ADP is 3.5 +/- 0.1, and that of lactate: pyruvate 27 +/- 6. The rate of conversion of heme into bilirubin is comparable to that reported for in vivo studies. A minimal effect on protein synthesis is observed after administration of the porphyrinogenic agents, allylisopropylacetamide (AIA) and 3,5-diethoxycarbonyl-1,4 dihydrocollidine (DDC). Pretreatment of the rats with the iron chelator, Desferal, causes a 3-4-fold increase in hemopexin but not in albumin and transferrin synthesis. A striking 2-3-fold enhancement of bile bilirubin production follows treatment with DDC and Desferal, but not with AIA. The amount of bilirubin formed from heme added to the perfusate is reduced by AIA and DDC and enhanced by Desferal treatment. It is proposed that unavailability of iron in a certain hepatic tissue pool causes protoporphyrin IX accumulation which may serve as an alternate source for bilirubin production." @default.
• W2051229358 created "2016-06-24" @default.
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• W2051229358 creator A5053137798 @default.
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• W2051229358 date "1977-01-01" @default.
• W2051229358 modified "2023-09-27" @default.
• W2051229358 title "Effect of porphyrinogenic agents on protein synthesis and bilirubin formation by the isolated perfused rat liver" @default.
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• W2051229358 doi "https://doi.org/10.1016/0304-4165(77)90114-3" @default.
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