title: Correlation between CD4 T cell counts and virus compartmentalization in genital and systemic compartments of HIV-infected females.
abstract: The majority of infection by the human immunodeficiency virus (HIV-1) across the world occurs by heterosexual transmission and is likely mediated by virus present in genital secretions. In spite of this, infection is followed by clinical markers of the virus present in blood, which may not be representative of the virus involved in transmission. In fact, several studies have demonstrated that the genital tract represents a unique compartment for the virus. We assessed the relationship between immune system integrity, represented by CD4+ T cell counts, and the maintenance of viral compartmentalization between plasma and vaginal fluid virus in treatment naïve women from the Dominican Republic infected by the heterosexual transmission route. We cloned and sequenced cell free virus from plasma and genital fluid samples from six women to assess viral evolution, phylogenetic relatedness, and calculated co-receptor use for the C2V3 region of the envelope. Our analyses demonstrated plasma and vaginal fluid virus compartments remained intact only in samples from women with CD4+ T cell counts over 350 cells/μl. The majority of viral forms were predicted to use the CCR5 co-receptor, although several dual tropic forms were also identified. None of the clones were found to use the CXCR4 co-receptor even though many of the patients showed severe disease. Our findings lend further support to the role of an intact immune system in maintaining compartmentalization across blood and genital quasispecies and provide a compelling rationale to specifically consider genital tract viral forms in therapeutic and vaccine research.
authors: AIDS Research Program, Ponce School of Medicine, Ponce, PR-00732, Puerto Rico.
authors: Suman
authors: S
authors: Chaudhary
authors: Richard J
authors: RJ
authors: Noel
authors: Nayra
authors: N
authors: Rodríguez
authors: Santiago
authors: S
authors: Collado
authors: Jhoanne
authors: J
authors: Munoz
authors: Anil
authors: A
authors: Kumar
authors: Yashuhiro
authors: Y
authors: Yamamura
mesh_terms: D000328:Adult; D018791:CD4 Lymphocyte Count; D003001:Cloning, Molecular; D016000:Cluster Analysis; D004293:Dominican Republic; D005260:Female; D015658:HIV Infections / Q000276:immunology* / Q000821:virology*; D015497:HIV-1 / Q000145:classification* / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification; D006801:Humans; D008969:Molecular Sequence Data; D010949:Plasma / Q000276:immunology* / Q000821:virology*; D012367:RNA, Viral / Q000235:genetics; D015728:Receptors, HIV / Q000502:physiology; D017422:Sequence Analysis, DNA; D014621:Vagina / Q000276:immunology* / Q000821:virology*; D053586:Virus Internalization
chemical_list: D012367:RNA, Viral; D015728:Receptors, HIV