scholarly journals Stoichiometric Modeling of Oxygen Transportation through the Surface of Isolated Perfused Rat Liver

2016 ◽  
Vol 11 (2) ◽  
pp. 263-277
Author(s):  
К.В. Шадрин ◽  
K.V. Shadrin
Keyword(s):  
Rat Liver ◽  
Cell Populations ◽  
Isolated Perfused Rat Liver ◽  
Oxygen Intake ◽  
Perfused Liver ◽  
Perfused Rat Liver ◽  
Modeling Methods ◽  
Isolated Organs ◽  
Flux Balance ◽  
Balance Analysis

Stoichiometric modeling allows analyzing the features of metabolism both the cell populations and the holistic isolated organs. In this paper, one of the stoichiometric modeling methods, Flux Balance Analysis, was used to investigate the mechanisms of oxygen transportation through the surface of the isolated perfused rat liver at various oxygenation conditions. It is shown that the oxygen intake through the surface of the isolated perfused liver is associated with energy consumption.

Biliary excretion of dihydro-11-keto-progesterone-4-C14 by isolated perfused liver

1964 ◽  
Vol 207 (5) ◽  
pp. 1030-1034 ◽  
Author(s):  
G. F. Leong ◽  
D. M. Cazes ◽  
M. L. Berliner ◽  
D. L. Berliner
Keyword(s):  
Rat Liver ◽  
Biliary Excretion ◽  
Half Life ◽  
Water Soluble ◽  
Isolated Perfused Rat Liver ◽  
Perfused Liver ◽  
Rapid Rate ◽  
Perfused Rat Liver ◽  
Bile Formation ◽  
Entire Study

The rates of biliary excretion of dihydro-11-keto-progesterone-4-C14 and of its metabolites were studied in the isolated perfused rat liver. The half-life of this steroid in the perfusing blood was 2.5 min, and at 40 min about 75% of the injected steroid had been excreted in bile. Formation of water-soluble steroids (WS St) took place at a rapid rate and by 60 min 100% of the steroids in blood were found to be water soluble. During the entire study the steroids excreted in bile were water soluble and accounted for 97.2–100% (avg. 98.2%). No dihydro-11-keto-progesterone was found to be excreted in the bile. The rate of disappearance from the blood, excretion in the bile, and degree of formation of WS St of this compound when compared with corticosterone and cortisol shows the following pattern: dihydro-11-keto-progesterone > corticosterone > cortisol.

scholarly journals Rates of ketone-body formation in the perfused rat liver

1969 ◽  
Vol 112 (5) ◽  
pp. 595-600 ◽  
Author(s):  
H. A. Krebs ◽  
Patricia G. Wallace ◽  
R. Hems ◽  
R. A. Freedland
Keyword(s):  
Fatty Acids ◽  
Rat Liver ◽  
Ketone Bodies ◽  
Short Chain Fatty Acids ◽  
Diabetic Rats ◽  
Isolated Perfused Rat Liver ◽  
Perfused Liver ◽  
Perfused Rat Liver ◽  
Normal Range ◽  
Physiological Value

1. The rates of formation of acetoacetate and β-hydroxybutyrate by the isolated perfused rat liver were measured under various conditions. 2. The rates found after addition of butyrate, octanoate, oleate and linoleate were about 100μmoles/hr./g. wet wt. in the liver of starved rats. These rates are much higher than those found with rat liver slices. 3. The differences between the rates given by slices and by the perfused organ were much higher with the long-chain than with short-chain fatty acids. The increments caused by oleate and linoleate were 12 and 16 times as large in the perfused organ as in the slices, whereas the increments caused by butyrate and octanoate were about four times as large. 4. The rates of ketogenesis in the unsupplemented perfused liver of well-fed rats, and the increments caused by the addition of fatty acids, were about half of those in the liver from starved rats. 5. The value of the [β-hydroxybutyrate]/[acetoacetate] ratio of the medium was raised by octanoate, oleate and linoleate. 6. Carnitine did not significantly accelerate ketogenesis from fatty acids. 7. Oleate formed up to 82% of the expected yield of ketone bodies. 8. In the liver of alloxan-diabetic rats the endogenous rates of ketogenesis were raised, in some cases as high as in the liver from starved rats, after addition of oleate. 9. On addition of either β-hydroxybutyrate or acetoacetate to the perfusion medium the liver gradually adjusted the [β-hydroxybutyrate]/[acetoacetate] ratio towards the normal range. 10. The [β-hydroxybutyrate]/[acetoacetate] ratio of the medium was about 0·4 when slices were incubated, but near the physiological value of 2 when the liver was perfused. 11. The experiments demonstrate that for the study of ketogenesis slices are in many ways grossly inferior to the perfused liver.

The utilization of ethanol by the isolated perfused rat liver

1968 ◽  
Vol 46 (4) ◽  
pp. 609-616 ◽  
Author(s):  
Ellen R. Gordon
Keyword(s):  
Rat Liver ◽  
Ethanol Consumption ◽  
Isolated Perfused Rat Liver ◽  
Gas Mixture ◽  
Perfused Liver ◽  
Perfused Rat Liver ◽  
Isolated Perfused Liver ◽  
Partial Pressures ◽  
Series Of Experiments ◽  
Lactic Acids

A series of experiments has shown that the mechanisms by which the metabolism of ethanol occurs are strongly influenced by the partial pressures of the oxygen present in the aerating medium. For the most frequently used gas mixture, 95% O2 + 5% CO2, the ethanol consumption was abnormally large, and proportional to the concentration of ethanol in the perfusate. However, when the system was aerated with 18% O2 + 5% CO2 + 77% N2 the consumption of ethanol was similar to that found in the intact rat. The perfusate concentration of glucose, acetone, and acetic, pyruvic, and lactic acids was measured in all experiments. When ethanol was consumed at these two different rates, increases in the lactic: pyruvic ratio and acetate levels of the perfusate were noted in both types of experiments. However, the utilization of glucose by isolated perfused liver was inhibited, and acetone levels increased markedly, when ethanol was consumed at abnormally rapid rates, although no effect was noted in the perfusate levels of these metabolites when ethanol was consumed at normal rates.

Taurocholate induces directional excretion of bilirubin into bile in perfused rat liver

1996 ◽  
Vol 270 (6) ◽  
pp. G1028-G1032 ◽  
Author(s):  
T. Yamaguchi ◽  
Y. Wakabayashi ◽  
M. Tanaka ◽  
T. Sano ◽  
H. Ishikawa ◽  
...  
Keyword(s):  
Rat Liver ◽  
Total Bilirubin ◽  
Liver Parenchyma ◽  
Isolated Perfused Rat Liver ◽  
Perfused Liver ◽  
Perfused Rat Liver ◽  
Liver Preparation ◽  
Directional Transport ◽  
Conjugated Bile Acids

The role of taurocholate, one of the major conjugated bile acids present in portal blood, in excretion of bilirubin from liver parenchyma to biliary and vascular compartments was studied in isolated perfused rat liver. Contents of bilirubin and carbon monoxide (CO) in the bile or venous effluents were determined by enzyme-linked immunosorbent microassay with the use of antibilirubin monoclonal antibody 24G7 and myoglobin-assisted spectrophotometry, respectively. In the presence of taurocholate, bilirubin excreted into the biliary compartment constituted greater than 90% of the total bilirubin excreted from the liver (0.26 nmol.min-1.g liver-1), corresponding to 60% of the outflow of CO into the venous effluents. In its absence, however, the total amount of bilirubin excreted into extrahepatic compartments was reduced to 27% of CO flux, and more than 90% of the excreted bilirubin was in the venous effluent. Thus a choleretic bile acid such as taurocholate is necessary for directional transport of bilirubin into bile in the perfused liver preparation.

A Comparison of Plasminogen Activators Derived from Rat Plasma, Primary Rat Hepatocytes and Isolated Perfused Rat Liver

1982 ◽  
Vol 47 (02) ◽  
pp. 166-172 ◽  
Author(s):  
Yoav Sharoni ◽  
Maria C Topal ◽  
Patricia R Tuttle ◽  
Henry Berger
Keyword(s):  
Rat Liver ◽  
Isoelectric Point ◽  
Rat Hepatocytes ◽  
Cell Types ◽  
Plasminogen Activators ◽  
Rat Plasma ◽  
Isolated Perfused Rat Liver ◽  
Perfused Rat Liver ◽  
Molecular Weights ◽  
Physiological Relevance

SummaryOf the two cell types it was possible to culture from the dissociated rat liver, hepatocytes and Kupffer cells, only the former were fibrinolytically active. Rat hepatocytes during the first 24 hr in culture secreted two plasminogen activators with molecular weights identical to those found in rat plasma, an 80,000-dalton form (PA-80) and a 45,000-dalton form (PA-45). Partially purified preparations of plasminogen activators from both sources were subjected to isoelectric focusing (IEF) to compare characteristics further. There were three distinct peaks of PA-45 in each preparation with isoelectric points of 7.1, 7.2 and 7.4; all electrophoretic forms had the same low affinity to fibrin. PA-80 from both sources displayed similar IEF profiles with forms ranging from pH values of 7 to 8, all with the same high affinity to fibrin. The major form of PA-80 in the plasma preparation had an isoelectric point of 7.9 whereas that in the hepatocyte preparation had an isoelectric point of 7.6. The isolated perfused rat liver was also shown to produce both PA-80 and PA-45 emphasizing the physiological relevance of the findings with hepatocytes. It is concluded that in the rat hepatocytes contribute to the plasma profile with regard to the plasminogen activator content.

Troxerutin protects the isolated perfused rat liver from a possible lipid peroxidation by coumarin

Phytomedicine ◽  
2005 ◽  
Vol 12 (1-2) ◽  
pp. 52-61 ◽  
Author(s):  
B.S. Adam ◽  
R. Pentz ◽  
C.P. Siegers ◽  
O. Strubelt ◽  
M. Tegtmeier
Keyword(s):  
Lipid Peroxidation ◽  
Rat Liver ◽  
Isolated Perfused Rat Liver ◽  
Perfused Rat Liver

scholarly journals Influence of Kynurenate on Cholesterol and Fatty Acid Synthesis in Isolated Perfused Rat Liver

1973 ◽  
Vol 248 (2) ◽  
pp. 738-739
Author(s):  
Christian A. Barth ◽  
H. Jürgen Hackenschmidt ◽  
Elmar E. Weis ◽  
Karl F.A. Decker
Keyword(s):  
Fatty Acid ◽  
Rat Liver ◽  
Fatty Acid Synthesis ◽  
Acid Synthesis ◽  
Isolated Perfused Rat Liver ◽  
Perfused Rat Liver
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