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*Brain Diseases
The Journal of Immunology, 2001, 167: 5429-5438.
Copyright © 2001 by The American Association of Immunologists

Highly Activated CD8+ T Cells in the Brain Correlate with Early Central Nervous System Dysfunction in Simian Immunodeficiency Virus Infection1

Maria Cecilia Garibaldi Marcondes, E. M. E. Burudi, Salvador Huitron-Resendiz, Manuel Sanchez-Alavez, Debbie Watry, Michelle Zandonatti, Steven J. Henriksen and Howard S. Fox2

Department of Neuropharmacology, The Scripps Research Institute, La Jolla, CA 92037

One of the consequences of HIV infection is damage to the CNS. To characterize the virologic, immunologic, and functional factors involved in HIV-induced CNS disease, we analyzed the viral loads and T cell infiltrates in the brains of SIV-infected rhesus monkeys whose CNS function (sensory evoked potential) was impaired. Following infection, CNS evoked potentials were abnormal, indicating early CNS disease. Upon autopsy at 11 wk post-SIV inoculation, the brains of infected animals contained over 5-fold more CD8+ T cells than did uninfected controls. In both infected and uninfected groups, these CD8+ T cells presented distinct levels of activation markers (CD11a and CD95) at different sites: brain > CSF > spleen = blood > lymph nodes. The CD8+ cells obtained from the brains of infected monkeys expressed mRNA for cytolytic and proinflammatory molecules, such as granzymes A and B, perforin, and IFN-{gamma}. Therefore, the neurological dysfunctions correlated with increased numbers of CD8+ T cells of an activated phenotype in the brain, suggesting that virus-host interactions contributed to the related CNS functional defects.




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