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Early SIV encephalopathy.

B Hurtrel1, L Chakrabarti, M Hurtrel

  • 1Institut Pasteur, Paris, France.

Journal of Medical Primatology
|June 1, 1991
PubMed
Summary
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This study investigated SIV encephalopathy in rhesus macaques. Early central nervous system (CNS) infection, primarily in macrophages, was observed following intravenous inoculation, with varied neuropathological changes.

Area of Science:

  • Neuroscience
  • Virology
  • Immunology

Background:

  • Simian immunodeficiency virus (SIV) infection in macaques serves as a model for human immunodeficiency virus (HIV) infection.
  • Understanding early central nervous system (CNS) involvement is crucial for developing effective therapeutic strategies.

Purpose of the Study:

  • To characterize the early neuropathological changes and cellular tropism of SIV in the CNS of rhesus macaques.
  • To compare the effects of intracerebral (IC) versus intravenous (IV) SIV inoculation on the CNS.

Main Methods:

  • Rhesus macaques were inoculated with SIV via IC or IV routes.
  • Central nervous system (CNS) tissues were analyzed for SIV presence and neuropathological alterations.
  • Combined immunohistochemistry and in situ hybridization were used to identify infected cell types.

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Main Results:

  • SIV was detected in the CNS of all IC-inoculated animals, though neuropathological changes were moderate.
  • IV-inoculated animals exhibited a range of brain lesions, including perivascular infiltrates and multinucleated giant cells.
  • CNS infection was evident as early as seven days post-IV-inoculation, with infected cells predominantly localized perivascularly and expressing macrophage markers.

Conclusions:

  • Early CNS infection with SIV occurs following IV inoculation in rhesus macaques.
  • Macrophages are a primary cell type infected by SIV in the CNS during the early stages of infection.
  • The route of inoculation influences the extent and type of neuropathological changes observed in the CNS.