Naturally-acquired influenza-specific CD4+ T-cell proliferative responses are impaired in HIV-infected African adults.

Jambo, Kondwani C., Sepako, Enoch, Glennie, Sarah, Mzinza, David, Williams, Neil A, Gordon, Stephen ORCID: https://orcid.org/0000-0001-6576-1116 and Heyderman, Robert S (2012) 'Naturally-acquired influenza-specific CD4+ T-cell proliferative responses are impaired in HIV-infected African adults.'. PLoS ONE, Vol 7, Issue 6, e38628.

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Abstract

BACKGROUND

Seasonal influenza has been associated with greater morbidity and mortality in AIDS patients. Highly-active antiretroviral therapy (HAART) has led to some reduction in influenza-related complications but the nature of naturally-acquired T-cell immunity to influenza virus in an African setting, and how this changes with immune reconstitution following HAART is unknown. We measured influenza-specific CD4(+) T-cell immunity in unimmunized HIV-infected Malawian adults and then investigated immune reconstitution following HAART.

METHODS

Peripheral blood mononuclear cells were isolated from HIV-infected and HIV-uninfected Malawian adults. CFSE proliferation and CD154 expression flow cytometry-based assays were used to measure influenza-specific CD4(+) T-cell immunity.

RESULTS

We found lower naturally-acquired proliferative influenza-specific CD4(+) T-cell responses in AIDS patients that was also present in asymptomatic HIV-infected adults with relatively high CD4 counts (>350 cells/µl). Influenza-specific CD4(+) T-cell immune reconstitution in HIV-infected patients on HAART for 12 months was poor despite a marked reduction in viral load and an increase in CD4 count. This poor immune reconstitution was characterised by a low influenza-specific proliferative CD4(+) T-cell response and reduced proportions of CD154-expressing influenza-specific CD4(+) T-cells in peripheral blood.

CONCLUSION

Our data suggest that asymptomatic HIV-infected adults may also be at risk of influenza-related complications and that HAART alone may not circumvent this risk in AIDS patients. This study highlights the need to identify possible interventions early in HIV infection to reduce the risk of influenza and to intensify influenza surveillance in these susceptible African populations.

Item Type:	Article
Subjects:	WC Communicable Diseases > Virus Diseases > Acquired Immunodeficiency Syndrome. HIV Infections > WC 503 Acquired immunodeficiency syndrome. HIV infections WC Communicable Diseases > Virus Diseases > Acquired Immunodeficiency Syndrome. HIV Infections > WC 503.5 Complications WC Communicable Diseases > Virus Diseases > Viral Respiratory Tract Infections. Respirovirus Infections > WC 515 Human influenza
Faculty: Department:	Groups (2002 - 2012) > Clinical Group
Digital Object Identifer (DOI):	https://doi.org/10.1371/journal.pone.0038628
Depositing User:	Julie Franco
Date Deposited:	22 Feb 2013 11:58
Last Modified:	07 Oct 2019 08:23
URI:	https://archive.lstmed.ac.uk/id/eprint/3327

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