Immunosenescent CD57+CD4+T-cells Accumulate and Contribute to Interferon-γResponses in HIV Patients Responding Stably to ART

Author:

Fernandez Sonia1,French Martyn A.12,Price Patricia12

Affiliation:

1. School of Pathology and Laboratory Medicine, University of Western Australia and PathWest Laboratory Medicine, Perth, Australia

2. Department of Clinical Immunology, Royal Perth Hospital and PathWest Laboratory Medicine, Perth, Australia

Abstract

HIV-infected individuals responding to antiretroviral therapy (ART) after severe CD4+T-cell depletion may retain low responses to recall antigens [eg: cytomegalovirus (CMV)] and altered expression of T-cell co-stimulatory molecules consistent with immunosenescence. We investigated the capacity of phenotypically senescent cells to generate cytokines in HIV patients receiving long-term ART (n= 18) and in healthy controls (n= 10). Memory T-cells were assessed by interferon (IFN)-γELISpot assay and flow cytometrically via IFN-γor IL-2. Proportions of CD57brightCD28nullCD4+T-cells correlated with IFN-γresponses to CMV (p= 0.009) and anti-CD3 (p= 0.002) in HIV patients only. Proportions of CD57brightCD28nullCD8+T-cells and CD8+T-cell IFN-γresponses to CMV peptides correlated in controls but not HIV patients. IL-2 was predominantly produced by CD28+T-cells from all donors, whereas IFN-γwas mostly produced by CD57+T-cells. The findings provide evidence of an accumulation of immunosenescent T-cells able to make IFN-γ. This may influence the pathogenesis of secondary viral infections in HIV patients receiving ART.

Funder

National Health and Medical Research Council

Publisher

Hindawi Limited

Subject

Biochemistry (medical),Clinical Biochemistry,Genetics,Molecular Biology,General Medicine

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