Neurobiol Dis. 2005 Oct;20(1):12-26.

Increase of C1q biosynthesis in brain microglia and macrophages during lentivirus infection in the rhesus macaque is sensitive to antiretroviral treatment with 6-chloro-2',3'-dideoxyguanosine.

Depboylu C, Schäfer MK, Schwaeble WJ, Reinhart TA, Maeda H, Mitsuya H, Damadzic R, Rausch DM, Eiden LE, Weihe E.

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Department of Molecular Neuroscience, Institute of Anatomy and Cell Biology, Philipps University, Robert-Koch-Str. 8, 35033 Marburg, Germany.

Abstract

Complement activation in the brain contributes to the pathology of neuroinflammatory and neurodegenerative diseases such as neuro-AIDS. Using semiquantitative in situ hybridization and immunohistochemistry, we observed an early and sustained increase in the expression of C1q, the initial recognition subcomponent of the classical complement cascade, in the CNS during simian immunodeficiency virus (SIV) infection of rhesus macaques. Cells of the microglial/macrophage lineage were the sources for C1q protein and transcripts. C1q expression was observed in proliferating and infiltrating cells in SIV-encephalitic brains. All SIV-positive cells were also C1q-positive. Treatment with the CNS-permeant antiretroviral agent 6-chloro-2',3'-dideoxyguanosine decreased C1q synthesis along with SIV burden and focal inflammatory reactions in the brains of AIDS-symptomatic monkeys. Thus, activation of the classical complement arm of innate immunity is an early event in neuro-AIDS and a possible target for intervention.

PMID:: 16137563; [PubMed - indexed for MEDLINE]

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