title: Significance of macrophage tropism of SIV in the macaque model of HIV disease.
abstract: Microglia, alveolar macrophages, and Langerhans cells are representatives of cells of macrophage lineage that are susceptible to infection with HIV-1 and they play important roles in the pathogenesis of AIDS dementia, lymphoid interstitial pneumonia, and systemic viral invasion from mucosal surfaces, respectively. In contrast, elimination of CD4+ T cells with resultant development of immunosuppression and AIDS is thought to be reflective of the exclusive tropism of the virus for CD4+ T cells. Examination of these concepts in macaques infected with molecularly cloned strains of SIVmac suggested that all strains of the virus are both macrophage- and lymphocyte-tropic and that all aspects of pathogenesis including loss of CD4+ T cells are dependent on infection in both cell types. However, viral clones that caused productive lytic infection in macrophages were less virulent than those which caused persistent nonproductive infection. The former caused subclinical and even immunizing infections, whereas the latter caused activation and productive infection in CD4+ T cells, AIDS, and systemic infection, even after inoculation of the virus on mucosal surfaces. If these findings on SIVmac are relevant to HIV-1 disease, then demonstration that HIV-1 isolates are macrophage-tropic probably does not necessarily correlate with their pathogenic potential.
authors.affiliation: Department of Microbiology, Molecular Genetics and Immunology, Marion Merrell Dow Laboratory of Viral Pathogenesis, University of Kansas Medical Center, Kansas City 66160-7317, USA.
authors.forename: E B
authors.initials: EB
authors.lastname: Stephens
authors.forename: D
authors.initials: D
authors.lastname: Galbreath
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Liu
authors.forename: M
authors.initials: M
authors.lastname: Sahni
authors.forename: Z
authors.initials: Z
authors.lastname: Li
authors.forename: R
authors.initials: R
authors.lastname: Lamb-Wharton
authors.forename: L
authors.initials: L
authors.lastname: Foresman
authors.forename: S V
authors.initials: SV
authors.lastname: Joag
authors.forename: O
authors.initials: O
authors.lastname: Narayan
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000276:immunology; D000818:Animals; D000938:Antigen-Presenting Cells / Q000821:virology; D001921:Brain / Q000821:virology; D015496:CD4-Positive T-Lymphocytes / Q000821:virology*; D002478:Cells, Cultured; D004195:Disease Models, Animal; D006678:HIV / Q000502:physiology; D015658:HIV Infections / Q000276:immunology; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology; D008213:Lymphocyte Activation; D008253:Macaca mulatta; D008264:Macrophages / Q000821:virology*; D009928:Organ Specificity; D016097:Simian Acquired Immunodeficiency Syndrome / Q000276:immunology / Q000503:physiopathology*; D015302:Simian Immunodeficiency Virus / Q000302:isolation & purification / Q000502:physiology*; D014764:Viral Proteins / Q000096:biosynthesis; D014779:Virus Replication
chemical_list: D007376:Interleukin-2; D014764:Viral Proteins