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(American Journal of Pathology. 1999;154:437-446.)
© 1999 American Society for Investigative Pathology

Regular Articles

Association of Simian Virus 40 with a Central Nervous System Lesion Distinct from Progressive Multifocal Leukoencephalopathy in Macaques with AIDS

Meredith A. Simon* , Petr O. Ilyinskii{dagger} , Gary B. Baskin{ddagger} , Heather Y. Knight* , Douglas R. Pauley* and Andrew A. Lackner*

From the Divisions of Comparative Pathology* and Microbiology,{dagger} New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts, and the Pathology Department,{ddagger} Tulane Regional Primate Research Center, Covington, Louisiana

The primate polyomavirus SV40 is known to cause interstitial nephritis in primary infections and progressive multifocal leukoencephalopathy (PML) upon reactivation of a latent infection in SIV-infected macaques. We now describe a second central nervous system manifestation of SV40: a meningoencephalitis affecting cerebral gray matter, without demyelination, distinct from PML. Meningoencephalitis appears also to be a primary manifestation of SV40 infection and can be seen in conjunction with SV40-induced interstitial nephritis and pneumonitis. The difference in the lesions of meningoencephalitis and PML does not appear to be due to cellular tropism, as both oligodendrocytes and astrocytes are infected in PML and meningoencephalitis, as determined by in situ hybridization or immunohistochemistry for SV40 coupled with immunohistochemistry for cellular determinants. This is further supported by examination of SV40 nucleic acid sequences from the ori-enhancer and large-T-antigen regions, which reveals no tissue- or lesion-specific variation in SV40 sequences.




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