Innate immune defects correlate with failure of antibody responses to H1N1/09 vaccine in HIV-infected patients - 30/11/11
Corresponding author: Savita Pahwa, MD, University of Miami Miller School of Medicine, 1580 NW 10th Avenue, BCRI 712, Miami, FL 33136.Abstract |
Background |
Mechanisms underlying the failure of influenza vaccine–induced antibody responses in HIV-infected persons are poorly understood.
Objective |
To investigate innate immune factors regulating B-cell function in HIV-infected persons and to correlate them with serologic responses to H1N1/09 vaccine.
Methods |
We evaluated immunologic characteristics of 17 HIV-infected patients and 8 healthy controls (HCs) at 0, 7, and 28 days (designated T0, T1, and T2) following a single 15-μg dose of nonadjuvanted H1N1/09 influenza vaccine by using flow cytometry, ELISpot, and ELISA. All HCs and 9 patients (53%) seroconverted with >1:40 hemagglutination inhibition antibody titer at T2.
Results |
In vaccine responders and HCs, serum levels of BAFF (B cell–activating factor) and APRIL (a proliferation-inducing ligand) increased from T0 to T2 in conjunction with increases in frequencies of memory B cells. Concurrently, receptors for these factors showed changes, with increases in expression of TACI (transmembrane activator and calcium modulator and cyclophilin ligand interactor) and decreases in BAFF receptor in memory B cells. IL-2 secreting cells and IgG antibody-secreting cells increased at T2 in vaccine responders and HCs in ex vivo H1N1 antigen–stimulated cultures. These immunologic responses were not evident at T1 and were deficient in vaccine nonresponder patients at T2. At T0, vaccine nonresponders had lower frequencies of BAFF receptor and TACI-expressing memory B cells than did responders.
Conclusion |
Impaired memory B-cell responses, deficiencies in serum BAFF and APRIL, and alterations in their receptors on B cells were associated with failure of H1N1/09 influenza vaccine responses among virologically controlled HIV-infected patients.
Le texte complet de cet article est disponible en PDF.Key words : 2009 H1N1 vaccination and HIV, B-cell defect in HIV, BAFF-binding receptors and HIV, innate immune defect and HIV, T-independent humoral immune factors
Abbreviations used : Ab, APRIL, ASCs, BAFF, BAFF-R, BBRs, BCMA, cART, NRs, Rs, SFU, TACI
Plan
| This work was supported by NIH grant A1077501 to S.P. and a specialty laboratory grant from International Maternal, Pediatric and Adolescent AIDS Clinical Trials Group (IMPAACT). Overall support for IMPAACT was provided by the National Institute of Allergy and Infectious Diseases (NIAID) (U01 AI068632), the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), and the National Institute of Mental Health (NIMH) (AI068632). |
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| Disclosure of potential conflict of interest: The authors have declared that they have no conflict of interest. |
Vol 128 - N° 6
P. 1279-1285 - décembre 2011 Retour au numéro
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