Relation of activation-induced deaminase (AID) expression with antibody response to A(H1N1)pdm09 vaccination in HIV-1 infected patients |
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Authors: | Alberto Cagigi Simone Pensieroso Nicolas Ruffin Stefano Sammicheli Rigmor Thorstensson Qiang Pan-Hammarström Bo Hejdeman Anna Nilsson Francesca Chiodi |
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Institution: | 1. Department of Laboratory Medicine, Karolinska Institutet at Karolinska University Hospital Huddinge, Stockholm, Sweden;2. Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden;3. The Swedish Institute for Communicable Disease Control, Stockholm, Sweden;4. Department of Infectious Diseases, Stockholm South General Hospital, Stockholm, Sweden;5. Pediatric Infectious Diseases Unit, Department of Women and Child Health, Karolinska Institutet, Stockholm, Sweden |
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Abstract: | The relevance of CD4+T-cells, viral load and age in the immunological response to influenza infection and vaccination in HIV-1 infected individuals has previously been pointed out. Our study aimed at assessing, in the setting of 2009 A(H1N1)pdm09 influenza vaccination, whether quantification of activation-induced deaminase (AID) expression in blood B-cells may provide additional indications for predicting antibody response to vaccination in HIV-1 infected patients with similar CD4+T-cell counts and age. Forty-seven healthy controls, 37 ART-treated and 17 treatment-naïve HIV-1 infected patients were enrolled in the study. Blood was collected prior to A(H1N1)pdm09 vaccination and at 1, 3 and 6 months after vaccination. Antibody titers to A(H1N1)pdm09 vaccine were measured by hemagglutination inhibition (HI) assay while the mRNA expression levels of AID were measured by quantitative real time PCR. Upon B-cell activation in vitro, AID increase correlated to antibody response to the A(H1N1)pdm09 vaccine at 1 month after vaccination in all individuals. In addition, the maximum expression levels of AID were significantly higher in those individuals who still carried protective levels of A(H1N1)pdm09 antibodies after 6 months from vaccination. No correlation was found between CD4+T-cell counts or age at vaccination or HIV-1 viral load and levels of A(H1N1)pdm09 antibodies. Assessing AID expression before vaccination may be an additional useful tool for defining a vaccination strategy in immune-compromised individuals at risk of immunization failure. |
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Keywords: | AID activation-induced deaminase HI hemagglutination inhibition |
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