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Contenido archivado el 2024-05-29

Redirecting Cytotoxic T Lymphocytes towards Leukemic antigens

Objetivo

We propose to make human T cells that bear chimeric receptors specific for CD33, a leukemia-associated antigen, and demonstrate that they are cytotoxic to human myeloid malignancies expressing this target antigen. However, the lack of stimulation through t he native T-cell immune receptor and the paucity of costimulatory molecules on the leukemia cells limit the survival, growth and functional activity of these chimeric effector cells once they are re-injected in vivo in patients. We plan to overcome this limitation by incorporating the CD33 chimeric receptor into cytotoxic T cells specific for EBV antigens (chimeric EBV-CTLs).

EBV antigens are persistently expressed by B cells in vivo, together with high levels of costimulatory molecules. Hence, they may provide the native receptor and costimulatory signals needed to sustain and expand the modified effector cells for their subsequent interaction with leukemic cells through their chimeric CD33 receptor. We will test our hypothesis in three aims. In Aim 1, we will compare the in vitro cytotoxic activities of chimeric EBV-CTLs with those of unselected chimeric T cells from EBV-seropositive patients with advanced CD33+ myeloid malignancies against established myeloid leukemia cell lines or primary myeloid blasts. In Aim 2, we will enhance T-cell activation by introducing costimulatory elements into the signalling domain of chimeric receptors expressed on the T-cell surface. In Aim 3, we will evaluate the antileukemic activity of chimeric T cells against a human CD33+ AML in vivo in NOD-SCID mice. If effective, we will seek approval to initiate a phase I/II clinical trial of chimeric CTLs in EBV-seropositive patients with relapsed or high-risk CD33+ leukemia.

Ámbito científico (EuroSciVoc)

Palabras clave

Tema(s)

Convocatoria de propuestas

FP6-2004-MOBILITY-12
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Régimen de financiación

IRG - Marie Curie actions-International re-integration grants

Coordinador

CENTRE L¿N B¿ARD
Aportación de la UE
Sin datos
Coste total
Sin datos