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Articles in PresS, published online ahead of print October 15, 2002
Am J Physiol Endocrinol Metab, 10.1152/ajpendo.00298.2002
Submitted on July 8, 2002
Accepted on October 8, 2002
1 Department of Medicine, Columbia University of Physicians and Surgeons, New York, NY, USA
* To whom correspondence should be addressed. E-mail: ijg3{at}columbia.edu.
Long-chain fatty acids (FA) supply 70-80% of the energy needs for normal cardiac muscle. To determine the sources of FA that supply the heart, (14C)palmitate complexed to bovine serum albumin and (3H)triolein (TG) incorporated into Intralipid were simultaneously injected into fasted male C57BL/6 mice. The ratio of TG/FA uptake was much greater for hearts than livers. Using double-labeled Intralipid with (3H)cholesteryl oleoyl ether (CE) and (14C)TG, we observed that hearts also internalize intact core lipid. Inhibition of lipoprotein lipase (LpL) with tetrahydrolipstatin or dissociation of LpL from the heart with heparin reduced cardiac uptake of TG by 82% and 64%, respectively (P<0.01). Palmitate uptake by the heart was not changed by either treatment. Uptake of TG was 88% less in hearts from LpL knockout mice that were rescued via LpL expression in the liver. Our data suggest that the heart is especially effective in removal of circulating TG and core lipids, and that this is due to LpL hydrolysis and not its bridging function.
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