The Effect of Adrenaline on Hepatic Lactate Uptake in the Acidotic Partially Ischaemic Rat Liver

1981 ◽  
Vol 60 (5) ◽  
pp. 543-548 ◽  
Author(s):  
R. A. Iles ◽  
R. D. Cohen ◽  
P. G. Baron ◽  
J. A. Smith ◽  
R. M. Henderson
Keyword(s):  
Blood Flow ◽  
Protective Effect ◽  
Rat Liver ◽  
Strenuous Exercise ◽  
Perfused Liver ◽  
Lactate Uptake ◽  
Glucose Output ◽  
Reduced Flow

1. The effect of adrenaline (7 × 10−8 and 7 × 10−7 mol/l) on lactate uptake and glucose output was studied in the perfused liver of starved rats under conditions of reduced flow and acid perfusate. 2. Adrenaline largely prevented the decrease in hepatic lactate uptake which would otherwise occur owing to reduced blood flow and acidosis and may, therefore, have a protective effect in strenuous exercise and shock.

The Effect of Combined Ischaemia and Acidosis on Lactate Uptake and Gluconeogenesis in the Perfused Rat Liver

1981 ◽  
Vol 60 (5) ◽  
pp. 537-542 ◽  
Author(s):  
R. A. Iles ◽  
R. D. Cohen ◽  
P. G. Baron
Keyword(s):  
Lactic Acid ◽  
Rat Liver ◽  
Hepatic Uptake ◽  
Strenuous Exercise ◽  
Perfused Rat Liver ◽  
Lactate Uptake ◽  
Glucose Output ◽  
Rat Livers

1. Perfused rat livers were subjected to an acid perfusate and varying degrees of ischaemia in an attempt to simulate the conditions of strenuous exercise or shock. 2. Lactate uptake and glucose output from the liver decreased during moderate ischaemia alone and more so when, in addition, the perfusate was made acidic. 3. Hepatic ATP and ADP content increased in the presence of an acid perfusate. 4. It is concluded that both ischaemia and acidosis may contribute to the diminished hepatic uptake of lactic acid in strenuous exercise and shock.

Hepatic lactate uptake versus leg lactate output during exercise in humans

2007 ◽  
Vol 103 (4) ◽  
pp. 1227-1233 ◽  
Author(s):  
H. B. Nielsen ◽  
M. A. Febbraio ◽  
P. Ott ◽  
P. Krustrup ◽  
N. H. Secher
Keyword(s):  
Blood Flow ◽  
Glucose Uptake ◽  
Prolonged Exercise ◽  
Incremental Exercise ◽  
Hepatic Glucose Output ◽  
Arterial Lactate ◽  
Hepatic Glucose ◽  
Lactate Output ◽  
Lactate Uptake ◽  
Glucose Output

The exponential rise in blood lactate with exercise intensity may be influenced by hepatic lactate uptake. We compared muscle-derived lactate to the hepatic elimination during 2 h prolonged cycling (62 ± 4% of maximal O2 uptake, V̇o2max) followed by incremental exercise in seven healthy men. Hepatic blood flow was assessed by indocyanine green dye elimination and leg blood flow by thermodilution. During prolonged exercise, the hepatic glucose output was lower than the leg glucose uptake (3.8 ± 0.5 vs. 6.5 ± 0.6 mmol/min; mean ± SE) and at an arterial lactate of 2.0 ± 0.2 mM, the leg lactate output of 3.0 ± 1.8 mmol/min was about fourfold higher than the hepatic lactate uptake (0.7 ± 0.3 mmol/min). During incremental exercise, the hepatic glucose output was about one-third of the leg glucose uptake (2.0 ± 0.4 vs. 6.2 ± 1.3 mmol/min) and the arterial lactate reached 6.0 ± 1.1 mM because the leg lactate output of 8.9 ± 2.7 mmol/min was markedly higher than the lactate taken up by the liver (1.1 ± 0.6 mmol/min). Compared with prolonged exercise, the hepatic lactate uptake increased during incremental exercise, but the relative hepatic lactate uptake decreased to about one-tenth of the lactate released by the legs. This drop in relative hepatic lactate extraction may contribute to the increase in arterial lactate during intense exercise.

Coordinated regulation of hepatic glycogen formation in perfused rat liver by glucose and lactate

1994 ◽  
Vol 266 (4) ◽  
pp. E583-E591 ◽  
Author(s):  
Z. Zhang ◽  
J. Radziuk
Keyword(s):  
Rat Liver ◽  
Dose Response ◽  
Glycogen Synthesis ◽  
Hepatic Glycogen ◽  
Perfused Rat Liver ◽  
Response Curves ◽  
Liver Preparation ◽  
Lactate Uptake ◽  
Glucose Output ◽  
Glycogen Formation

Lactate has been found to enhance the formation of glycogen from both glucose and lactate as substrate (Z. Zhang and J. Radziuk. Biochem. J. 280: 415–419, 1991). To evaluate the relative importance of its role as substrate and regulatory factor, a dual dose-response evaluation was done by adding variable amounts of glucose and lactate to the medium in a recirculating perfused rat liver preparation. Nine groups of perfusions were performed utilizing three different levels of carbon infusion into the system: 0.25, 1.0, and 2.0 mg/min. These levels of carbon infusion were further subdivided into different relative amounts of glucose and lactate. Lactate uptake by the perfused liver was linearly related with net glucose output, regardless of the glucose concentrations. In contrast to this, the effect of lactate uptake on the rate of glycogen synthesis is saturable. Moreover, the rate of glycogen formation at which this saturation occurs is dependent only on the mean perfusate glucose concentration. The highest amount of glycogen formed in a 2-h period was 50 +/- 7 mg and the lowest 3.4 +/- 0.3 mg. A family of dose-response curves was generated describing this dual dependence of glycogen formation (both direct and gluconeogenetic pathways) on lactate and glucose.

Metabolic effects of acetate in perfused rat liver studies on ketogenesis, glucose output, lactate uptake and lipogenesis

1982 ◽  
Vol 716 (3) ◽  
pp. 290-297 ◽  
Author(s):  
Alan M. Snoswell ◽  
Rodney P. Trimble ◽  
Richard C. Fishlock ◽  
Gerald B. Storer ◽  
David L. Topping
Keyword(s):  
Rat Liver ◽  
Metabolic Effects ◽  
Perfused Rat Liver ◽  
Lactate Uptake ◽  
Glucose Output

Hepatic lactate uptake is enhanced by low pH at low lactate concentrations in perfused rat liver

1986 ◽  
Vol 70 (1) ◽  
pp. 19-22 ◽  
Author(s):  
Leif Sestoft ◽  
Michael O. Marshall
Keyword(s):  
Linear Function ◽  
Rat Liver ◽  
Lactate Concentration ◽  
Low Ph ◽  
Perfused Liver ◽  
Perfused Rat Liver ◽  
Effect Of Ph ◽  
Lactate Uptake

1. The effect of pH on lactate uptake was studied in perfused liver of rats starved for 48 h. 2. At both low pH (6.8) and normal pH (7.4) lactate uptake was a linear function of lactate concentration in input medium in the range 0.4–1.5 mmol/l. 2. In the lower concentration range (0.4–0.8 mmol/l) the rate of lactate uptake was 30% higher at pH 6.8 than at pH 7.4. 4. At pH 6.8 lactate uptake was independent of whether Pco2 was 2.7 or 5.3 kPa. 5. We suggest the increased rate of lactate uptake at low pH and concentrations lower than 0.8 mmol/l was due to the stimulatory effect of H+ on the lactate carrier.

Liver Blood Flow as a Major Determinant of the Clearance of Recombinant Human Tissue-Type Plasminogen Activator

1992 ◽  
Vol 67 (01) ◽  
pp. 083-087 ◽  
Author(s):  
A de Boer ◽  
C Kluft ◽  
J M Kroon ◽  
F J Kasper ◽  
H C Schoemaker ◽  
...  
Keyword(s):  
Blood Flow ◽  
Rat Liver ◽  
Healthy Subjects ◽  
Liver Blood Flow ◽  
Major Determinant ◽  
Tissue Type ◽  
Perfused Rat Liver ◽  
Liver Model ◽  
Type Plasminogen Activator ◽  
Proportional Change

SummaryThe influence of changes in liver blood flow on the clearance of rt-PA was studied both in healthy subjects and in a perfused rat liver model. Liver blood flow in healthy subjects was documented indirectly by the clearance of indocyanine green (ICG). Exercise reduced liver blood flow on average by 57% with a 95% confidence interval (95% Cl) ranging from 51% to 62% (n = 5) and increased plasma levels of rt-PA activity (after an i. v. infusion of 18 mg of rt-PA over 120 min) by 119% (95% Cl, 58% - 203%) and rt-PA antigen by 91% (95% Cl, 30% - 140%). In the perfused rat liver model it was shown that halving or doubling of the physiological flow rate of a perfusate, containing rt-PA caused a proportional change in the clearance of rt-PA, while the extraction of rt-PA by the liver remained similar. In conclusion, liver blood flow is a major determinant of the clearance of rt-PA. This may have important implications for dosage of rt-PA in patients with myocardial infarction.

Protective effect ofAloe veragel on the permeability transition pore in the inner membrane of rat liver mitochondriain vitro

2014 ◽  
Vol 37 (4) ◽  
pp. 415-419 ◽  
Author(s):  
Seun Funmilola Akomolafe ◽  
John Oludele Olanlokun ◽  
Adeolu Jonathan Adesina ◽  
Olabode Olufunso Olorunsogo
Keyword(s):  
Protective Effect ◽  
Rat Liver ◽  
Permeability Transition Pore ◽  
Permeability Transition ◽  
Inner Membrane

Vanadate inhibits glucose output from isolated perfused rat liver

Hepatology ◽  
1991 ◽  
Vol 14 (3) ◽  
pp. 540-544 ◽  
Author(s):  
Rafael Bruck ◽  
Haia Prigozin ◽  
Zipora Krepel ◽  
Paul Rotenberg ◽  
Yoram Shechter ◽  
...  
Keyword(s):  
Rat Liver ◽  
Isolated Perfused Rat Liver ◽  
Perfused Rat Liver ◽  
Glucose Output
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