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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11906

Title: Helicobacter pylori Coinfection Is Associated With Decreased Markers of Immune Activation in ART-Naive HIV-Positive and in HIV-Negative Individuals in Ghana
Authors: Phillips, Richard O.
Eberhardt, Kirsten Alexandra
Sarfo, Fred Stephen
Dompreh, Albert
Kuffour, Edmund Osei
et. al
Keywords: HIV/AIDS;
Helicobacter pylori;
immune activation;
sub-Saharan Africa.
Issue Date: 15-Nov-2015
Publisher: Oxford University Press
Citation: Oxford University Press CID 2015:61 (15 November) • 1615
Abstract: Background. Helicobacter pylori coinfection in human immunodeficiency virus (HIV) patients has been associated with higher CD4+ cell counts and lower HIV-1 viral loads, with the underlying mechanisms being unknown. The objective of this study was to investigate the impact of H. pylori infection on markers of T-cell activation in HIVpositive and HIV-negative individuals. Methods. In a cross-sectional, observational study, HIV patients (n = 457) and HIV-negative blood donors (n = 79) presenting to an HIV clinic in Ghana were enrolled. Data on clinical and sociodemographic parameters, CD4+/CD8+ T-cell counts, and HIV-1 viral load were recorded. Helicobacter pylori status was tested using a stool antigen test. Cell surface and intracellular markers related to T-cell immune activation and turnover were quantified by flow cytometry and compared according to HIV and H. pylori status. Results. Helicobacter pylori infection was associated with decreased markers of CD4+ T-cell activation (HLADR+ CD38+CD4+; 22.55% vs 32.70%; P = .002), cell proliferation (Ki67; 15.10% vs 26.80%; P = .016), and immune exhaustion (PD-1; 32.45% vs 40.00%; P = .005) in 243 antiretroviral therapy (ART)–naive patients, but not in 214 patients on ART. In HIV-negative individuals, H. pylori infection was associated with decreased frequencies of activated CD4+ and CD8+ T cells (6.31% vs 10.40%; P = .014 and 18.70% vs 34.85%, P = .006, respectively). Conclusions. Our findings suggest that H. pylori coinfection effectuates a systemic immune modulatory effect with decreased T-cell activation in HIV-positive, ART-naive patients but also in HIV-negative individuals. This findingmight, in part, explain the observed association of H. pylori infection with favorable parameters of HIV disease progression. Clinical Trials Registration. Clinicaltrials.gov NCT01897909.
Description: An article published by Oxford University Press and available at DOI: 10.1093/cid/civ577
URI: http://hdl.handle.net/123456789/11906
Appears in Collections:College of Health Sciences

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