Abstract
Brain lipid metabolism was studied in rats following permanent bilateral common carotid artery ligation (BCCL), a model for chronic cerebral hypoperfusion. Unesterified (free) fatty acids (uFA) and acyl-CoA concentrations were measured 6 h, 24 h, and 7 days after BCCL or sham surgery, in high energy-microwaved brain. In BCCL compared to sham rats, cytosolic phospholipase A2 (cPLA2) immunoreactivity in piriform cortex, and concentrations of total uFA and arachidonoyl-CoA, an intermediate for arachidonic acid reincorporation into phospholipids, were increased only at 6 h. At 24 h, immunoreactivity for secretory phospholipase A2 (sPLA2), which may regulate blood flow, was increased near cortical and hippocampal blood vessels. BCCL did not affect levels of brain IB4+ microglia, glial fibrillary acidic protein (GFAP)+ astrocytes, cyclooxygenase-2 (COX-2) immunoreactivity at any time, but increased cPLA2 immunoreactivity in one region at 6 h. Thus, BCCL affected brain lipid metabolism transiently, likely because of compensatory sPLA2-mediated vasodilation, without producing evidence of neuroinflammation.
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Abbreviations
- ARA:
-
Arachidonic acid
- BCCL:
-
Bilateral common carotid artery ligation
- cPLA2 :
-
Cytoplasmic phospholipase A2
- sPLA2 :
-
Secretory phospholipase A2
- CBF:
-
Cerebral blood flow
- COX-2:
-
Cyclooxygenase 2
- HRP:
-
Horseradish peroxidase
- IB4 :
-
Isolectin B4
- GFAP:
-
Glial fibrillary acidic protein
- uFA:
-
Unesterified fatty acid
- PGE2 :
-
Prostaglandin E2
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This research was supported entirely by the Intramural Research Program of the National Institute on Aging, and by the National Institute of Environmental Health Science, NIH.
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Bhattacharjee, A.K., White, L., Chang, L. et al. Bilateral Common Carotid Artery Ligation Transiently Changes Brain Lipid Metabolism in Rats. Neurochem Res 37, 1490–1498 (2012). https://doi.org/10.1007/s11064-012-0740-2
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DOI: https://doi.org/10.1007/s11064-012-0740-2