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Cerebral glucose transporter expression in HIV infection
1Department of Pathology, Mount Sinai Medical Center, New York, NY 10029, USA.
Acta Neuropathologica
|August 1, 1997
Summary
Levels of glucose transporters like GLUT1 change in the brain during HIV infection. Early HIV infection may increase GLUT1, while advanced HIV encephalitis may decrease it, impacting cerebral glucose metabolism.
Area of Science:
- Neuroscience
- Infectious Diseases
- Biochemistry
Background:
- Cerebral glucose metabolism is altered in AIDS dementia complex (ADC).
- Early ADC shows increased glucose consumption, while late stages exhibit decreased utilization.
- The underlying mechanisms for these metabolic shifts remain unclear.
Purpose of the Study:
- To investigate alterations in cerebral glucose transporter (GLUT1 and GLUT3) levels in HIV disease.
- To explore the relationship between HIV neuropathology and glucose transporter expression.
Main Methods:
- Quantitative immunoblots were used to measure GLUT1 and GLUT3 levels.
- Frontal gray and white matter membrane preparations from HIV-infected and control subjects were analyzed.
- Glucose transporter levels were normalized to actin to account for protein loading.
Main Results:
- While individual brain regions showed high patient variability, pooled gray and white matter data revealed significant changes.
- GLUT1 levels increased in HIV infection without neuropathology.
- GLUT1 levels decreased in patients with HIV encephalitis (HIVE).
Conclusions:
- Increased GLUT1 in early HIV infection may contribute to heightened glucose consumption observed in early ADC.
- Reduced glucose transporter levels in HIVE could underlie the hypometabolism seen in late-stage disease.
- These findings suggest a dynamic role for glucose transporters in HIV-related brain changes.