title: Phagocytic efficiency of monocytes and macrophages obtained from Sydney blood bank cohort members infected with an attenuated strain of HIV-1.
abstract: Defective function of monocyte-derived macrophages contributes to HIV-1 pathogenesis. We found that phagocytosis of the opportunistic pathogens Mycobacterium avium complex and Toxoplasma gondii was impaired in monocytes obtained from individuals infected with wild-type strains of HIV-1 but generally not in monocytes collected over a 6-year period from Sydney Blood Bank Cohort (SBBC) members infected with nef/long terminal repeats (LTR) region-defective strains of HIV-1. However, longitudinal analysis of phagocytosis in 1 SBBC member, C54, showed the development of defective engulfment of opportunistic pathogens at the most recent time points, coincident with the development of further molecular deletions in the nef/LTR region. Another SBBC member, C98, underwent bronchoscopy, which provided material to examine phagocytic signaling in alveolar macrophages. In contrast to normal phagocytic efficiency of C98's monocytes (over a 6-year period), defective signaling events during FcgammaR-mediated phagocytosis by C98's alveolar macrophages were observed. High basal phosphorylation within HIV-infected macrophages correlated with colocalization of tyrosine-phosphorylated proteins with HIV-1 p24 antigen rather than around the phagocytic targets as observed in uninfected cells. Thus, although phagocytic efficiency appears to be generally unimpaired in monocytes from SBBC members, evidence of impairment in recent samples from 1 SBBC member, coincident with further genetic changes within the virus, and abnormal phagocytic signaling in alveolar macrophages from another SBBC member may herald loss of attenuation of those strains.
authors.affiliation: AIDS Research Unit, Monash University, Victoria, Australia.
authors.forename: Katherine
authors.initials: K
authors.lastname: Kedzierska
authors.forename: Melissa
authors.initials: M
authors.lastname: Churchill
authors.forename: Clare L V
authors.initials: CL
authors.lastname: Maslin
authors.forename: Rula
authors.initials: R
authors.lastname: Azzam
authors.forename: Philip
authors.initials: P
authors.lastname: Ellery
authors.forename: Hiu-Tat
authors.initials: HT
authors.lastname: Chan
authors.forename: John
authors.initials: J
authors.lastname: Wilson
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Deacon
authors.forename: Anthony
authors.initials: A
authors.lastname: Jaworowski
authors.forename: Suzanne M
authors.initials: SM
authors.lastname: Crowe
mesh_terms: D000925:Anticoagulants / Q000494:pharmacology; D001771:Blood Banks / Q000592:standards; D001793:Blood Preservation; D001800:Blood Specimen Collection / Q000379:methods; D015658:HIV Infections / Q000097:blood*; D018023:HIV Seronegativity; D006493:Heparin / Q000494:pharmacology; D006801:Humans; D008264:Macrophages / Q000166:cytology / Q000473:pathology / Q000502:physiology*; D018613:Microscopy, Confocal; D009000:Monocytes / Q000166:cytology / Q000473:pathology / Q000502:physiology*; D010586:Phagocytes / Q000166:cytology / Q000473:pathology / Q000502:physiology*; D010587:Phagocytosis / Q000187:drug effects / Q000502:physiology*; D013997:Time Factors; D014739:Victoria
chemical_list: D000925:Anticoagulants; D006493:Heparin