Effect of free fatty acid on the oxygen consumption of perfused rat heart

1966 ◽  
Vol 210 (2) ◽  
pp. 280-286 ◽  
Author(s):  
DR Challoner ◽  
D Steinberg
Keyword(s):  
Oxygen Consumption ◽  
Fatty Acid ◽  
Free Fatty Acid ◽  
Rat Heart ◽  
Perfused Rat Heart

Effects of noradrenaline and nicotinic acid on plasma free fatty acids and oxygen consumption in cold-adapted rats

1979 ◽  
Vol 57 (7) ◽  
pp. 725-730 ◽  
Author(s):  
Louise Lafrance ◽  
Danièle Routhier ◽  
Bernard Têtu ◽  
Christian Têtu
Keyword(s):  
Fatty Acids ◽  
Oxygen Consumption ◽  
Fatty Acid ◽  
Free Fatty Acid ◽  
Nicotinic Acid ◽  
Free Fatty Acids ◽  
Simultaneous Increase ◽  
Elevated Plasma ◽  
Cold Adapted ◽  
Plasma Ffa

A 3-h noradrenaline (NA) infusion (1.5 μg kg−1 min−1) produced a sustained enhanced oxygen consumption (O2 cons.) in cold-adapted rats. Plama free fatty acid (FFA) levels were elevated by NA in control and in cold-adapted rats, but to a lesser extent in cold-adapted rats; the increase was maintained at a plateau in both groups during the entire period of NA infusion. A 1-h nicotinic acid (Nic A) infusion (1.5 mg kg−1 min−1) added to the NA infusion inhibited the calorigenic response to NA in cold-adapted rats and reduced the elevated plasma FFA concentration in control and in cold-adapted rats to values below basal levels. However, when the Nic A infusion was stopped, the O2 cons, was increased again in cold-adapted rats by the uninterrupted NA infusion, without the simultaneous increase of the plasma FFA concentration; the plasma FFA concentration was maintained in cold-adapted rats below basal values and merely brought back to basal levels in control rats. From these results, it is suggested that plasma FFA are not an essential substrate to the calorigenic response to NA observed in cold-adapted rats, as 85% of the response can occur when the plasma FFA concentration is very low.

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