scholarly journals Evaluation of malonyl-CoA in the regulation of long-chain fatty acid oxidation in the liver. Evidence for an unidentified regulatory component of the system

1980 ◽  
Vol 192 (3) ◽  
pp. 959-962 ◽  
Author(s):  
J A Ontko ◽  
M L Johns
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Liver Mitochondria ◽  
Chain Fatty Acid ◽  
Molar Ratio ◽  
Acid Oxidation ◽  
Long Chain Fatty Acid ◽  
Malonyl Coa ◽  
Site Of Action ◽  
Long Chain

Palmitate oxidation by liver mitochondria from fed and starved rats exhibited markedly different sensitivities to inhibition by malonyl-CoA. In the mitochondrial system from fed rats, 50% inhibition required 19 muM-malonyl-CoA, whereas the mitochondria from starved rats were by comparison refractory to malonyl-CoA. Inhibition by malonyl-CoA was completely reversed by increasing the molar ratio of fatty acid to albumin. Results indicate that the potential effectiveness of malonyl-CoA as an inhibitor of fatty acid oxidation in the liver is dependent on an unidentified regulatory component of the system. The functional activity of this component is modified by the nutritional state, and its site of action is at the mitochondrial level.

scholarly journals CPT1a-Dependent Long-Chain Fatty Acid Oxidation Contributes to Maintaining Glucagon Secretion from Pancreatic Islets

Cell Reports ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 3300-3311 ◽  
Author(s):  
Linford J.B. Briant ◽  
Michael S. Dodd ◽  
Margarita V. Chibalina ◽  
Nils J.G. Rorsman ◽  
Paul R.V. Johnson ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Pancreatic Islets ◽  
Fatty Acid Oxidation ◽  
Glucagon Secretion ◽  
Chain Fatty Acid ◽  
Acid Oxidation ◽  
Long Chain Fatty Acid ◽  
Long Chain

Chronic inhibition of fatty acid oxidation: new model of diastolic dysfunction

1990 ◽  
Vol 258 (1) ◽  
pp. H51-H56 ◽  
Author(s):  
S. E. Litwin ◽  
T. E. Raya ◽  
R. G. Gay ◽  
J. B. Bedotto ◽  
J. J. Bahl ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Weight Ratio ◽  
Left Ventricular ◽  
Chain Fatty Acid ◽  
Acid Oxidation ◽  
Long Chain Fatty Acid ◽  
Ventricular Relaxation ◽  
Left Ventricular Chamber ◽  
Long Chain

This study was designed to determine the changes in the heart that result from inhibition of long-chain fatty acid oxidation with 2-tetradecylglycidic acid (TDGA). Male Sprague-Dawley rats (n = 64) were treated with TDGA (20 mg.kg-1.day-1) or a comparable volume of vehicle by gavage feeding for 7 or 21 days. In conscious rats TDGA produced no changes in heart rate, left ventricular systolic or end-diastolic pressures, left ventricular pressure development (dP/dt), or the time constant of left ventricular relaxation. Left ventricular developed pressure was not changed at 21 days. TDGA increased left ventricular weight, left ventricular weight-to-body weight ratio, and total heart weight-to-body weight ratio. Left ventricular endocardial and epicardial myocyte volumes were increased by 53 and 65%, respectively. Myocardial triglyceride content was increased threefold. Left ventricular chamber stiffness constants between end-diastolic pressures of 0 and 30 mmHg were increased, and left ventricular end-diastolic volumes at operating end-diastolic pressures were decreased at both 7 and 21 days. The myocardial stiffness constant was also increased at 7 and 21 days. Thus inhibition of long-chain fatty acid oxidation with TDGA increased left ventricular mass and altered left ventricular chamber and muscle stiffness without changing left ventricular relaxation or systolic function. We conclude that inhibition of long-chain fatty acid oxidation produced an unusual model of left ventricular hypertrophy and diastolic dysfunction characterized by abnormalities of passive-elastic properties but preserved relaxation.

Sign in / Sign up

Export Citation Format

Share Document