title: Increased HLA-DR expression on peripheral blood monocytes in subsets of subjects with primary HIV infection is associated with elevated CD4 T-cell apoptosis and CD4 T-cell depletion.
abstract: Whereas T-cell activation parameters of HIV disease have been extensively studied, the activation status of circulating monocytes has received less attention. Sixty-one subjects with primary HIV infection were evaluated by fluorescent-activated cell sorter (FACS) analysis at baseline (pretreatment) for CD4 T-cell count, CD4 T-cell apoptosis, and immune activation. A subset of 15 subjects with marked elevated (3 standard deviations above normal) monocyte DR expression had significantly reduced CD4 T-cell counts at baseline (p <.01) when compared with 46 subjects without monocyte activation. Ten subjects who presented with elevated levels of both CD14/DR, and CD4/CD38, had higher CD4 T-cell apoptosis (p <.001), and lower CD4 T-cell counts (p <.001) and higher baseline plasma HIV RNA (p <.01) than 21 subjects without elevated CD14/DR and CD4/CD38 coexpression. Fifty subjects were subsequently evaluated for immune cell activation over 24 weeks postinitiation of highly active antiretroviral therapy (HAART). A subgroup of 5 subjects who had persistent CD14/DR activation showed continuous depression of CD4 T-cell counts persisting for up to 2 years. The CD4 T-cell counts of this subgroup were significantly lower, at all time points, in comparison to 35 subjects who lacked any persistent expression of monocyte or CD4 T-cell activation (at 24 weeks, p <.002). We conclude that monocyte activation as defined by elevation of CD14/DR expression correlates to CD4 T-cell depletion in primary HIV infection, and is predictive of a poor CD4 T-cell response to HAART in a subset of patients.
authors.affiliation: University of California at San Francisco, Department of Medicine, 94110, USA. Rgascon@php.ucsf.edu
authors.forename: Ronnie L
authors.initials: RL
authors.lastname: Gascon
authors.forename: Amy B
authors.initials: AB
authors.lastname: Narváez
authors.forename: Rongzhen
authors.initials: R
authors.lastname: Zhang
authors.forename: James O
authors.initials: JO
authors.lastname: Kahn
authors.forename: Frederick M
authors.initials: FM
authors.lastname: Hecht
authors.forename: Brian G
authors.initials: BG
authors.lastname: Herndier
authors.forename: Michael S
authors.initials: MS
authors.lastname: McGrath
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D015703:Antigens, CD; D000943:Antigens, Differentiation / Q000378:metabolism; D023241:Antiretroviral Therapy, Highly Active; D017209:Apoptosis; D018791:CD4 Lymphocyte Count; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000502:physiology*; D005434:Flow Cytometry; D015658:HIV Infections / Q000188:drug therapy / Q000276:immunology* / Q000821:virology; D015497:HIV-1 / Q000276:immunology*; D006684:HLA-DR Antigens / Q000378:metabolism*; D006801:Humans; D018950:Lipopolysaccharide Receptors / Q000378:metabolism; D008213:Lymphocyte Activation; D008231:Lymphopenia; D008562:Membrane Glycoproteins; D009000:Monocytes / Q000276:immunology* / Q000821:virology; D009244:NAD+ Nucleosidase / Q000378:metabolism; D012367:RNA, Viral / Q000097:blood
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D006684:HLA-DR Antigens; D018950:Lipopolysaccharide Receptors; D008562:Membrane Glycoproteins; D012367:RNA, Viral; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; D009244:NAD+ Nucleosidase; D051997:ADP-ribosyl Cyclase 1