Sélection immunomagnétique des lymphocytes T antiviraux IFN-[gamma]+ : analyse quantitative, fonctionnelle et composition en sous-populations lymphocytaires T

Abstract : Allogeneic hematopoietic stem cell transplantation (HSCT) is the standard treatment for malignant or non-malignant hematological disorders or primary immunodeficiencies. However, microbiological infections especially viral infections are the major cause for morbidity and mortality for the patients after HSCT except the GvHD and disease relapse. It comes often in the period of absence of cellular immunity when the antiviral treatment is not always efficiency with an important toxicity. So the alternative treatment is adoptive cellular immunotherapy by infusion of virus specific T cells (VSTs) which has been shown efficacy in virus infections control after HSCT. In UTCT, they have produced the VSTs-ADV with a good procedure conforming to the European laws for clinical use and a clinic trial is in processing. So my work was to produce the VSTs-EBV with the same model aiming to promote a clinic trial in future. Furthermore, there are several subsets of T lymphocytes. Each subset has their own unique feature which decides their efficacy in viral infection control. Especially the discovery of stem cell like memory T cells (TSCM) with an important self-renewed ability which is critical in successful immunotherapy in viral infection or tumor control inspire us to study the distribution of subsets for VSTs. Finally, it’s advantageous to produce the VSTs targeted two or more virus in the same time with one production which is more economical. So we are interested in producing the VSTs bi-specific to ADV and EBV. Here, we present firstly our results of six production of VSTs-EBV with a synthesized antigen which is compatible with clinic use and is defined in advance. Also the specificity, efficiency in eliminating the virus and the non toxicity with a weak alloreactivity are confirmed in vitro after a short-term cell culture with IL-2. Then we showed the results obtained with the T cell subset study in producing the VSTs-ADV for clinical trial and VSTs-CMV for validation of clinical grade medium TEXMACS for cell culture in producing the VSTs. We describe the distribution of T cell subsets in healthy donors (Before selection), also after selection and after expansion in vitro with IL-2. Finally, we present the preliminary results of producing the VSTs bi-specific with three donors, in total 3 VSTs-ADV, 3 VSTs-EBV and 3VSTs-ADV/EBV are generated. The comparison between the bi-specific VSTs and mono-specific VSTs in aspect of specificity, efficiency to eliminate the viral infection and toxicity of presenting the alloreactivity in vitro showed advantage to produce the bi-specific VSTs with one selection in keeping the same specific, efficiency and weak toxicity as mono-specific VSTs
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Yingying Wang. Sélection immunomagnétique des lymphocytes T antiviraux IFN-[gamma]+ : analyse quantitative, fonctionnelle et composition en sous-populations lymphocytaires T. Médecine humaine et pathologie. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0139⟩. ⟨tel-01750994⟩

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