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Alveolar T-helper 17 responses to streptococcus pneumoniae are preserved in ART-untreated and treated HIV-infected Malawian adults.

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Peno, Chikondi, Banda, Dominic H, Jambo, Ndaru, Kankwatira, Anstead M, Malamba, Rose D, Allain, Theresa J, Ferreira, Daniela ORCID: https://orcid.org/0000-0002-0594-0902, Heyderman, Robert S, Russell, David G, Mwandumba, Henry ORCID: https://orcid.org/0000-0003-4470-3608 and Jambo, Kondwani ORCID: https://orcid.org/0000-0002-3195-2210 (2018) 'Alveolar T-helper 17 responses to streptococcus pneumoniae are preserved in ART-untreated and treated HIV-infected Malawian adults.'. Journal of Infection, Vol 76, Issue 2, pp. 168-176.

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Abstract

We explored if HIV infection is associated with impaired T-Helper 17 responses against Streptococcus pneumoniae in the lung. We recruited 30 HIV-uninfected healthy controls, 23 asymptomatic HIV-infected adults not on ART, and 40 asymptomatic HIV-infected adults on ART (Median time 3.5yrs), in whom we collected bronchoalveolar lavage fluid. We measured alveolar CD4+ T cell immune responses following stimulation with pneumococcal cell culture supernatant using flow cytometry-based intracellular cytokine staining. We found that the proportion of alveolar CD4+ T cells producing IL-17A following stimulation with pneumococcal cell culture supernatant (CCS) was similar between HIV-uninfected controls and ART-naïve HIV-infected adults (0.10% vs. 0.14%; p = 0.9273). In contrast, the proportion and relative absolute counts of CD4+ T cells producing IL-17A in response to pneumococcal CCS were higher in ART-treated HIV-infected adults compared HIV-uninfected controls (0.22% vs. 0.10%, p = 0.0166; 5420 vs. 1902 cells/100 ml BAL fluid; p = 0.0519). The increase in relative absolute numbers of IL-17A-producing alveolar CD4+ T cells in ART-treated individuals was not correlated with the peripheral blood CD4+ T cell count (r=-0.1876, p = 0.1785). Alveolar Th17 responses against S. pneumoniae are preserved in HIV-infected adults. This suggests that there are other alternative mechanisms that are altered in HIV-infected individuals that render them more susceptible to pneumococcal pneumonia. [Abstract copyright: Copyright © 2017 The Author(s). Published by Elsevier Ltd.. All rights reserved.]

Item Type: Article
Subjects: WA Public Health > WA 30 Socioeconomic factors in public health (General)
WC Communicable Diseases > Infection. Bacterial Infections > Bacterial Infections > WC 202 Pneumonia (General or not elsewhere classified)
WC Communicable Diseases > Infection. Bacterial Infections > Bacterial Infections > WC 210 Streptococcal infections (General or not elsewhere classified)
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
Faculty: Department: Clinical Sciences & International Health > Clinical Sciences Department
Clinical Sciences & International Health > Malawi-Liverpool-Wellcome Programme (MLW)
Digital Object Identifer (DOI): https://doi.org/10.1016/j.jinf.2017.10.013
SWORD Depositor: JISC Pubrouter
Depositing User: Stacy Murtagh
Date Deposited: 15 Dec 2017 15:18
Last Modified: 05 Nov 2019 14:57
URI: https://archive.lstmed.ac.uk/id/eprint/7958

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