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Am J Physiol 231: 860-864, 1976;
0002-9513/76 $5.00
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American Journal of Physiology, Vol 231, Issue 3, 860-864
Copyright © 1976 by American Physiological Society

ARTICLES

Lipoprotein lipase and uptake of chylomicron triglyceride by skeletal muscle of rats

C Linder, SS Chernick, TR Fleck, and RO Scow

Uptake of chylomicron triglyceride and lipoprotein lipase was studied in red and white skeletal muscles, heart, and adipose tissue of rats. Retention of triglyceride fatty acids 10 min after injection was 1.6%/g in heart and adipose tissue, 0.2-0.4%/g in red (soleus and diaphragm) muscles, and 0.1%/g in white (psoas minor) muscles of fed rats. Fasting (24 h) increased retention two- to fourfold in red skeletal muscles and heart, had no effect in white muscles, and decreased retention greater than 75% in adipose tissue. Lipoprotein lipase activity in fed rats was lowest in white muscles and in certain red (posterior belly of digastric and medial head of triceps brachii) musclws, intermediate in soleus and diaphragm muscles and adipose tissue, and highest in heart. Fasting doubled lipoprotein lipase activity in all red skeletal muscles and heart, had no effect in white muscles, and decreased activity 60% in adipose tissue. The findings indicate that triglyceride uptake is related to lipoprotein lipase activity in skeletal muscle and the changes in enzyme activity during fasting divert blood triglyceride to red skeletal muscles.


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