| Identification and frequency of circulating CD4(+) T lymphocytes specific to Benzylpenicillin in healthy donors. Auteur(s) : Nhim, C Delluc, S Halgand, F de Chaisemartin, L Weaver, R J Claude, N Joseph, D Maillère, B Auteurs secondaires : Cytokines, chimiokines et immunopathologie ; Université Paris-Sud - Paris 11 (UP11) - Institut National de la Santé et de la Recherche Médicale (INSERM) Institut de recherche, santé, environnement et travail [Rennes] (Irset) ; Université d'Angers (UA) - Université des Antilles et de la Guyane (UAG) - Université de Rennes 1 (UR1) - École des Hautes Études en Santé Publique [EHESP] (EHESP) - Institut National de la Santé et de la Recherche Médicale (INSERM) - Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ) Service d'Ingénierie Moléculaire des Protéines (SIMOPRO) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA) - Université Paris-Saclay Éditeur(s) : HAL CCSD Wiley Résumé : International audience Drug hypersensitivity is known to rely on a drug-specific T-cell response. Amplitude of antigen-specific T-cell response is partly controlled by the size of the antigen-specific naïve CD4(+) T-cell repertoire, but estimate of this repertoire has never been investigated for allergenic drugs. The purpose of this study was to evaluate the frequency of benzylpenicillin-specific CD4(+) T lymphocytes in healthy donors. Co-cultures were established with CD4(+) T lymphocytes from healthy donors and mature autologous dendritic cells loaded with benzylpenicillin coupled to human serum albumin. CD4(+) T lymphocytes were stimulated once a week for 4 weeks with benzylpenicillin coupled to human serum albumin. The CD4(+) T-cell response was measured using an interferon-γ ELISPOT assay. Frequency of benzylpenicillin-specific naive CD4(+) T lymphocytes was then calculated using the Poisson distribution law. Results showed the presence of benzylpenicillin-specific CD4(+) T lymphocytes in 9 of 10 tested healthy donors irrespective of their HLA typing, with a mean frequency of 0.29 cells per million of CD4(+) T cells. Experiments performed on naive (CD45RA(+) ) and on memory (CD45RO(+) ) CD4(+) T lymphocytes showed that these benzylpenicillin-specific CD4(+) T lymphocytes belonged to the naive T-cell subpopulation. This study showed for the first time the existence of naive CD4(+) T lymphocytes specific to benzylpenicillin in healthy donors. ISSN: 0105-4538 hal-01122172 https://hal-univ-rennes1.archives-ouvertes.fr/hal-01122172 PUBMED : 23751122 DOI : 10.1111/all.12173 | Partager
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