Effects of postdecapitation ischemia on the metabolism of [14C]arachidonic acid and [14C]palmitic acid in the mouse brain

Neurochemical Research
M F PediconiN G Bazán

Abstract

The effect of postdecapitation ischemia on the labeling of the free fatty acid pool and their incorporation in lipids was examined during the first 10 min after decapitation in mouse brain that had been injected intracerebrally with either [1-14C]arachidonic acid or [1-14C]palmitic acid. One min after decapitation, animals injected with labeled arachidonic acid exhibited a greatly reduced incorporation of label in brain phospholipids, diglycerides, and triglycerides. When radioactive palmitic acid was used, brain lipids exhibited considerably less inhibition of label. However, a similar degree of inhibition was observed 10 min after decapitation with both fatty acids. At this time, free arachidonic acid had decreased 84% as compared to the 24% decrease observed in the controls, and about 77% of the free palmitic acid remained in the free fatty acid fraction as compared with 30% in the controls. This decreased labeling may reflect ATP shortage that affects the fatty acid activation-reacylation reactions or the enzymes involved. Alternatively, the enhanced endogenous free arachidonic acid may compete with the radiolabeled arachidonic acid resulting in an inhibition of lipid labeling. Inhibition of label may have been greater in r...Continue Reading

References

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Citations

Oct 26, 1999·Neurourology and Urodynamics·M A HassR M Levin
May 23, 2012·Analytical and Bioanalytical Chemistry·Hay-Yan J WangCheng Bin Liu
Mar 1, 1988·The Journal of Clinical Investigation·E B Rodriguez de Turco, J A Spitzer
Jan 1, 1989·Journal of Neurochemistry·M M Zaleska, D F Wilson

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