Intrathymic adeno-associated virus gene transfer rapidly restores thymic function and long-term persistence of gene-corrected T cells

Marie Pouzolles, Alice Machado, Mickaël Guilbaud, Magali Irla, Sarah Gailhac, Pierre Barennes, Daniela Cesana, Andrea Calabria, Fabrizio Benedicenti, Arnauld Sergé, Indu Raman, Quan Zhen Li, Eugenio Montini, David Klatzmann, Oumeya Adjali, Naomi Taylor, Valérie S. Zimmermann

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Background: Patients with T-cell immunodeficiencies are generally treated with allogeneic hematopoietic stem cell transplantation, but alternatives are needed for patients without matched donors. An innovative intrathymic gene therapy approach that directly targets the thymus might improve outcomes. Objective: We sought to determine the efficacy of intrathymic adeno-associated virus (AAV) serotypes to transduce thymocyte subsets and correct the T-cell immunodeficiency in a zeta-associated protein of 70 kDa (ZAP-70)–deficient murine model. Methods: AAV serotypes were injected intrathymically into wild-type mice, and gene transfer efficiency was monitored. ZAP-70−/− mice were intrathymically injected with an AAV8 vector harboring the ZAP70 gene. Thymus structure, immunophenotyping, T-cell receptor clonotypes, T-cell function, immune responses to transgenes and autoantibodies, vector copy number, and integration were evaluated. Results: AAV8, AAV9, and AAV10 serotypes all transduced thymocyte subsets after in situ gene transfer, with transduction of up to 5% of cells. Intrathymic injection of an AAV8–ZAP-70 vector into ZAP-70−/− mice resulted in a rapid thymocyte differentiation associated with the development of a thymic medulla. Strikingly, medullary thymic epithelial cells expressing the autoimmune regulator were detected within 10 days of gene transfer, correlating with the presence of functional effector and regulatory T-cell subsets with diverse T-cell receptor clonotypes in the periphery. Although thymocyte reconstitution was transient, gene-corrected peripheral T cells harboring approximately 1 AAV genome per cell persisted for more than 40 weeks, and AAV vector integration was detected. Conclusions: Intrathymic AAV-transduced progenitors promote a rapid restoration of the thymic architecture, with a single wave of thymopoiesis generating long-term peripheral T-cell function.

Original languageEnglish (US)
Pages (from-to)679-697.e5
JournalJournal of Allergy and Clinical Immunology
Volume145
Issue number2
DOIs
StatePublished - Feb 2020

Keywords

  • Severe combined immunodeficiency
  • T-cell reconstitution
  • gene therapy
  • humoral immunity
  • intrathymic gene transfer
  • medulla formation
  • thymus
  • zeta-associated protein of 70kDa

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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  • Cite this

    Pouzolles, M., Machado, A., Guilbaud, M., Irla, M., Gailhac, S., Barennes, P., Cesana, D., Calabria, A., Benedicenti, F., Sergé, A., Raman, I., Li, Q. Z., Montini, E., Klatzmann, D., Adjali, O., Taylor, N., & Zimmermann, V. S. (2020). Intrathymic adeno-associated virus gene transfer rapidly restores thymic function and long-term persistence of gene-corrected T cells. Journal of Allergy and Clinical Immunology, 145(2), 679-697.e5. https://doi.org/10.1016/j.jaci.2019.08.029