Abstract
Background
Human immunodeficiency virus type 1 (HIV-1) infection of the central nervous system (CNS) can lead to severe impairments in cognition, behavior, and motor skills. The mechanism(s) by which HIV-1 induces CNS disease are not well understood. Recent evidence suggests that expression of inducible nitric oxide synthase (iNOS) and nitric oxide (NO) may contribute to HIV-1-induced neurologic disease. We sought to determine if these factors were present in the CNS of rhesus monkeys with simian immunodeficiency virus (SIV)-induced CNS disease.
Materials and Methods
Total NO production in cerebral spinal fluid (CSF) from infected monkeys was determined by measuring nitrite (NO2−) and nitrate (NO3−) (stable NO degradation products) utilizing Greiss reagents. In situ hybridization revealed iNOS, interferon-γ (IFNγ), and interleukin 1β (IL-1β) mRNA in the brains of SIV-infected monkeys. Microglia were isolated from animals infected with SIV. Following stimulation with LPS, induction of iNOS mRNA in isolated microglia was analyzed by reverse transcriptase-polymerase chain reaction.
Results
Serial CSF samples from an SIV-infected monkey reveal increased levels of NO2−/NO3−. In situ hybridization demonstrated iNOS, IFNγ, and DL-1β mRNAs in post-mortem brain tissue of SIV-infected monkeys. Furthermore, stimulated microglia from an SIV-infected monkey could produce iNOS mRNA.
Conclusions
The presence of iNOS in the brain and NO2−/NO3− in the CSF indicates that NO is produced in the CNS of SIV-infected monkeys. The data suggest that iNOS and NO may be contributing to SIV-induced CNS disease.
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Acknowledgments
We thank Dr. Floyd Bloom for advice and support and Michelle Zandonatti for excellent technical assistance. This is Scripps Research Institute Manuscript Number 9451-NP. This work was supported by NIMH AIDS Center Grant MH 47680 and National Institutes of Health (NIH) Grant AR40981. TEL was supported (in part) by Postdoctoral Fellowship Grant FA 1163A1 from the National Multiple Sclerosis Society and NIH Training Grant MH 19185.
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Contributed by F. E. Bloom on September 11, 1995.
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Lane, T.E., Buchmeier, M.J., Watry, D.D. et al. Expression of Inflammatory Cytokines and Inducible Nitric Oxide Synthase in Brains of SIV-Infected Rhesus Monkeys: Applications to HIV-Induced Central Nervous System Disease. Mol Med 2, 27–37 (1996). https://doi.org/10.1007/BF03402200
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DOI: https://doi.org/10.1007/BF03402200