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Incorporation of [1-carbon-11]palmitate in monkey brain using PET
T Arai1, S Wakabayashi, M A Channing
1Laboratory of Neurosciences, National Institutes on Aging, National Institutes of Health, Bethesda, MD 20892, USA.
Summary
Positron emission tomography (PET) can measure how quickly [1-11C]palmitate incorporates into brain lipids in monkeys. This technique, using methyl palmoxirate (MEP), may help study human brain phospholipid metabolism.
Area of Science:
- Neuroscience
- Biochemistry
- Medical Imaging
Background:
- Plasma [1-11C]palmitate is a tracer for studying lipid metabolism.
- Brain lipid synthesis and turnover are crucial for neuronal function.
- Positron emission tomography (PET) allows in vivo imaging of metabolic processes.
Purpose of the Study:
- To determine regional incorporation coefficients (k*) of plasma [1-11C]palmitate into stable brain lipids in anesthetized monkeys using PET.
- To investigate the effect of methyl palmoxirate (MEP), a beta-oxidation inhibitor, on [1-11C]palmitate incorporation in the brain.
Main Methods:
- Administered [1-11C]palmitate intravenously to monkeys, with and without MEP pretreatment.
- Monitored plasma radioactivity and measured brain radioactivity over time using PET.
- Applied a least-squares method to calculate regional k* values and cerebral blood volume (Vb).
Main Results:
- Established mean k* values for different brain regions (temporal, frontal, parietal, occipital cortices, and white matter).
- MEP significantly reduced [11C]CO2 levels, indicating inhibition of palmitate beta-oxidation.
- MEP increased k* in white matter but did not significantly alter it in gray matter regions.
Conclusions:
- PET is a viable method for quantifying regional [1-11C]palmitate incorporation into the primate brain in vivo.
- [1-11C]palmitate combined with MEP shows potential for assessing regional brain phospholipid metabolism in humans under various conditions.