Publications & Reports

Decreased NK Cell FcRgamma in HIV-1 infected individuals receiving combination antiretroviral therapy: a cross sectional study.

Leeansyah E, Zhou J, Paukovics G, Lewin SR, Crowe SM, Jaworowski A
Centre for Virology, The Macfarlane Burnet Institute for Medical Research and Public Health, Melbourne, Australia.


BACKGROUND: FcRgamma is an immunoreceptor tyrosine-based activation motif (ITAM)-signalling protein essential for immunoreceptor signaling and monocyte, macrophage and NK cell function. Previous study from our laboratory showed that FcRgamma is down-regulated in HIV-infected macrophages in vitro. FcRgamma expression in immune cells present in HIV-infected individuals is unknown.

METHODOLOGY/PRINCIPAL FINDINGS: We compared FcRgamma expression in peripheral blood mononuclear cells isolated from HIV-1-infected individuals receiving combination antiretroviral therapy and healthy, HIV-1-uninfected individuals. FcRgamma mRNA and protein levels were measured using quantitative real-time PCR and immunoblotting, respectively. CD56(+) CD94(+) lymphocytes isolated from blood of HIV-1 infected individuals had reduced FcRgamma protein expression compared to HIV-uninfected individuals (decrease = 76.8%, n = 18 and n = 12 respectively, p = 0.0036). In a second group of patients, highly purified NK cells had reduced FcRgamma protein expression compared to uninfected controls (decrease = 50.2%, n = 9 and n = 8 respectively, p = 0.021). Decreased FcRgamma expression in CD56+CD94+ lymphocytes was associated with reduced mRNA (51.7%, p = 0.021) but this was not observed for the smaller group of patients analysed for NK cell expression (p = 0.36).

CONCLUSION/SIGNIFICANCE: These data suggest biochemical defects in ITAM-dependent signalling within NK cells in HIV-infected individuals which is present in the context of treatment with combination antiretroviral therapy.


  • Journal: PloS One
  • Published: 10/03/2010
  • Volume: 5
  • Issue: 3
  • Pagination: e9643

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