Abstract
The incorporation of acetate-l-14C into CO2 and total fatty acids and the activities of NADP-malate dehydrogenase, NADP-isocitrate dehydrogenase, glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase and acetyl CoA carboxylase were studied in intramuscular adipose tissue from the trapezius, longissimus, semimembranosus and pectoralis profundus muscles of 470 kg, 14-month-old Hereford × Angus steers. It was concluded that intramuscular lipid can be synthesized in situ, but at a slower rate than subcutaneous lipid. The rate of synthesis of fatty acids and CO2 from acetate-l-14C was directly related to adipose cell volume and for this reason the intramuscular adipose tissue of the pectoralis profundus muscle was more active than that of the other three muscles. The activities of the four NADPH-generating enzymes were positively related to both adipose cell volume and fatty acid synthesis. NADP-malate dehydrogenase activity was low in intramuscular adipose tissue; however, the hexose monophosphate shunt dehydrogenases and possibly NADP-isocitrate dehydrogenase are capable of supplying NADPH for fatty acid synthesis in bovine intramuscular adipose tissue.
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