A novel virus capture assay reveals a differential acquisition of host HLA-DR by clinical isolates of human immunodeficiency virus type 1 expanded in primary human cells depending on the nature of producing cells and the donor source.
Previous findings indicated that HLA-DR is probably one of the most abundant cellular constituents incorporated within the human immunodeficiency virus type 1 (HIV-1) envelope. Given that the life-cycle of HIV-1 has been reported to be modulated by virion-bound host HLA-DR, an improved version of a virus capture technique was developed to assess the degree of HLA-DR incorporation in several clinical isolates of HIV-1 derived from primary human peripheral blood mononuclear cells (PBMCs) and monocyte-derived macrophages (MDM). Analysis of virus stocks purified from PBMCs and MDM indicated that primary isolates of HIV-1 bearing distinct tropism (i.e. T-, macrophage-, and dual-tropic) all incorporate host cell membrane HLA-DR protein. The amount of incorporated HLA-DR varies among the primary HIV-1 isolates tested. Propagation of some clinical HIV-1 isolates in either autologous PBMCs or MDM resulted in differential incorporation of virion-bound cellular HLA-DR depending on the nature of the virus producer cells. Differences in the degree of HLA-DR incorporation were also noticed when macrophage-tropic isolates of HIV-1 were produced in MDM from different donors. Altogether these data show that the efficiency of HLA-DR incorporation into the envelope of primary isolates of HIV-1 is a multifactorial phenomenon since it is affected by the virus isolate itself, the nature of host cells (i.e. PBMCs or MDM) and the donor source.
Cantin
Réjean
R
Centre de Recherche en Infectiologie, Hôpital CHUL, Centre Hospitalier Universitaire de Québec and Département de Biologie Médicale, Faculté de Médecine, Université Laval, Ste-Foy (Québec), Canada1.
Martin
Geneviève
G
Centre de Recherche en Infectiologie, Hôpital CHUL, Centre Hospitalier Universitaire de Québec and Département de Biologie Médicale, Faculté de Médecine, Université Laval, Ste-Foy (Québec), Canada1.
Tremblay
Michel J
MJ
Centre de Recherche en Infectiologie, Hôpital CHUL, Centre Hospitalier Universitaire de Québec and Département de Biologie Médicale, Faculté de Médecine, Université Laval, Ste-Foy (Québec), Canada1.
D002478:Cells, Cultured; D015497:HIV-1 / Q000276:immunology / Q000378:metabolism*; D006684:HLA-DR Antigens / Q000378:metabolism*; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000821:virology*; D008264:Macrophages / Q000821:virology*; D008565:Membrane Proteins / Q000378:metabolism*; D013045:Species Specificity; D014759:Viral Envelope Proteins / Q000378:metabolism*
D006684:HLA-DR Antigens; D008565:Membrane Proteins; D014759:Viral Envelope Proteins