Maintenance of the phosphorylation state of the brain, which is essential for cellular viability and normal brain function, requires an unimpeded supply of glucose and oxygen. Under conditions of oxygen insufficiency, changes in certain modulators (such as ATP, G-6-P, G-1, 6-DP) may enhance the rate of glucose utilization by their action on key enzymes in the respective metabolic pathways. In addition, with development in early life, the proportion of glucose oxidized to carbon dioxide and water in the citric acid cycle to that metabolized to pyruvate and lactate in the glycolytic and hexosemonophosphate pathways changes dramatically. The primary objective of this project is to investigate how hypoxia impacts upon the mechanisms which regulate brain glucose metabolism during development. This project will center on the enzymatic control of the respective fluxes through hexokinase, glucose-6-phosphate dehydrogenase, and alpha-ketoglutarate dehydrogenase complex in the neocortex of immature and mature rats exposed to acute and chronic periods of hypoxia. ? Our general hypothesis is that differences in the regulation of specific metabolic pathways contributing to the maintenance of the phosphorylation state are the result of changes in key enzymatic activities or their modulators. Using in-vivo and in-vitro NMR spectroscopy, MRI and enzymatic assays n-vitro, we will examine not only the maturation of glucose flux, the mechanisms involved and the effect of hypoxia on these but also the importance and the role that such fluxes play in nerve cell function and survival potential in the immature and mature subject.

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR011811-02
Application #
6283146
Study Section
Project Start
1998-03-01
Project End
1999-02-28
Budget Start
1997-10-01
Budget End
1998-09-30
Support Year
2
Fiscal Year
1998
Total Cost
Indirect Cost
Name
University of Alabama Birmingham
Department
Type
DUNS #
004514360
City
Birmingham
State
AL
Country
United States
Zip Code
35294
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Patton, H K; Chu, W J; Hetherington, H P et al. (2001) Alkaline pH changes in the cerebellum of asymptomatic HIV-infected individuals. NMR Biomed 14:12-8

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