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T CELL HOMEOSTASIS

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Conditioning regimens shape the homeostasis of adoptively transferred T cells E...

Conditioning regimens shape the homeostasis of adoptively transferred T cells Effects on autoreactivity and role in anti tumor therapy The ability of adoptively-transferred T cells to mediate an immune response is modulated by the host environment. It has previously been shown that donor T cells proliferate and acquire memory-like characteristics when injected in... ver más

31/12/2013

CNRS

100K€

Presupuesto del proyecto: 100K€

Líder del proyecto

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2013-12-31 No tenemos la información de la convocatoria

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1 Participantes

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Líder del proyecto

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 100K€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto The ability of adoptively-transferred T cells to mediate an immune response is modulated by the host environment. It has previously been shown that donor T cells proliferate and acquire memory-like characteristics when injected into lymphopenic hosts while in hosts with a « full » T cell compartment, they remain naïve and do not acquire effector function. As it is important to optimize the persistence and responsiveness of transferred T cells for immunotherapy strategies, we assessed whether T cell fate is dependent upon the conditioning regimen used to achieve lymphopenia. We induced lymphopenia in C57Bl/6 mice by sub-lethal irradiation or chemotherapy using busulfan with cyclophosphamide (Bu/Cy) and found that the relative engraftment of CD4 and CD8 T cells was markedly changed by the conditioning protocol: Irradiation-induced lymphopenia resulted in a skewed proliferation of donor CD8 T cells with a CD4:CD8 ratio of <1:5 whereas Bu/Cy-induced lymphopenia resulted in a massive proliferation of donor CD4 T cells with only minimal proliferation of CD8 T cells. These results clearly demonstrate that lymphopenic conditions are not equivalent in their potential to foster the regeneration of T cell pools. I propose to study the characteristics of the host and adoptively-transferred T cells generated in these two lymphopenic environments, with specific assessment of TH1, TH17 and Treg subsets. As the host microenvironment modulates T cell persistence and function, the effects of these regimens on the fate of stromal cell and APC populations will also be monitored. Moreover, I will study the consequences of irradiation and Bu/Cy conditioning on the reconstitution and function of adoptively-transferred T cells harboring a re-directed tumor-specific TCR in mice harbouring B cell lymphomas. The identification of parameters that enhance the survival and reactivity of adoptively-transferred tumor-specific T cells is important for the development of immunotherapy strategies

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