title: CD8+ and CD20+ lymphocytes cooperate to control acute simian immunodeficiency virus/human immunodeficiency virus chimeric virus infections in rhesus monkeys: modulation by major histocompatibility complex genotype.
abstract: We have previously described two isogenic molecularly cloned simian immunodeficiency virus/human immunodeficiency virus chimeric viruses (SHIVs) that differ from one another by 9 amino acids and direct distinct clinical outcomes in inoculated rhesus monkeys. SHIV(DH12R-Clone 7), like other highly pathogenic CXCR4-tropic SHIVs, induces rapid and complete depletions of CD4+ T lymphocytes and immunodeficiency in infected animals. In contrast, macaques inoculated with SHIV(DH12R-Clone 8) experience only partial and transient losses of CD4+ T cells, show prompt control of their viremia, and remain healthy for periods of time extending for up to 4 years. The contributions of CD8+ and CD20+ lymphocytes in suppressing the replication of the attenuated SHIV(DH12R-Clone 8) and maintaining a prolonged asymptomatic clinical course was assessed by treating animals with monoclonal antibodies that deplete each lymphocyte subset at the time of virus inoculation. The absence of either CD8+ or CD20+ cells during the SHIV(DH12R-Clone 8) acute infection resulted in the rapid, complete, and irreversible loss of CD4+ T cells; sustained high levels of postpeak plasma viremia; and symptomatic disease in Mamu-A*01-negative Indian rhesus monkeys. In Mamu-A*01-positive animals, however, the aggressive, highly pathogenic phenotype was observed only in macaques depleted of CD8+ cells; SHIV(DH12R-Clone 8) was effectively controlled in Mamu-A*01-positive monkeys in the absence of B lymphocytes. Taken together, these results indicate that both CD8+ and CD20+ B cells contribute to the control of primate lentiviral infection in Mamu-A*01-negative macaques. Furthermore, the major histocompatibility complex genotype of an infected animal, as exemplified by the Mamu-A*01 allele in this study, has the additional capacity to shift the balance of the composite immune response.
authors.affiliation: Laboratory of Molecular Microbiology, NIAID, NIH, Bethesda, MD 20892, USA.
authors.forename: Hanwen
authors.initials: H
authors.lastname: Mao
authors.forename: Bernard A P
authors.initials: BA
authors.lastname: Lafont
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Igarashi
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Nishimura
authors.forename: Charlie
authors.initials: C
authors.lastname: Brown
authors.forename: Vanessa
authors.initials: V
authors.lastname: Hirsch
authors.forename: Alicia
authors.initials: A
authors.lastname: Buckler-White
authors.forename: Reza
authors.initials: R
authors.lastname: Sadjadpour
authors.forename: Malcolm A
authors.initials: MA
authors.lastname: Martin
mesh_terms: D000818:Animals; D018951:Antigens, CD20 / Q000276:immunology*; D016827:CD8 Antigens / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000821:virology; D005838:Genotype; D015483:HIV Antibodies / Q000097:blood; D015658:HIV Infections / Q000276:immunology / Q000821:virology*; D015497:HIV-1 / Q000235:genetics / Q000276:immunology* / Q000472:pathogenicity; D006801:Humans; D008253:Macaca mulatta; D008285:Major Histocompatibility Complex / Q000235:genetics / Q000502:physiology; D015302:Simian Immunodeficiency Virus / Q000235:genetics / Q000276:immunology* / Q000502:physiology; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000821:virology
chemical_list: D018951:Antigens, CD20; D016827:CD8 Antigens; D015483:HIV Antibodies