Objetivo
The fine and complex regulation of CD4 immune response is important in cancer, autoimmune diseases, inflammatory disorders and viral infection. If signals orchestrating productive CD4 T-cell responses are well documented, the contraction of antigen (Ag)-specific CD4 T-cell populations following the resolution of primary immune response is however not molecularly understood. It has been demonstrated that a negative feedback loop can regulate CD4 T cell proliferation through direct T-T interactions, leading to the preferential exclusion of Ag-experienced T cells. This T cell intrinsic mechanism limits the expansion of effector CD4 T cells and may then interfere with therapeutic vaccine efficacy. Using Cas9-(constitutive/inducible)-expressing Dby-reactive T cells (from a TCR Transgenic RAG-/- mouse strain named Marilyn) coupled to a sgRNA library and an in vivo selection strategy, we will extensively identify the negative regulators of CD4 T cells migration and priming in an ongoing primary immune response. As a proof of concept, we will first inactivate candidate genes (already known to be involved in CD4 T cells negative regulation: TGF-b receptor,IFN-γ receptor, PD-1 and PD-L1) in Ag-experienced memory CD4 T cells, which will be enriched for their proliferative capacity in vivo and used as a second cohort in immunized mice. Then, we will develop a genome-wide screen approach to generate a library of knockout Ag-experienced T cells as a second cohort. We expect that further insight into CD4 suppressive mechanisms, which dampen efficient antitumor immune responses, will allow optimization of cancer immunotherapy.
Ámbito científico
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural.
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural.
- medical and health sciencesbasic medicineimmunologyautoimmune diseases
- medical and health sciencesbasic medicinepharmacology and pharmacypharmaceutical drugsvaccines
- medical and health sciencesclinical medicineoncology
- medical and health sciencesbasic medicinephysiology
- medical and health sciencesbasic medicineimmunologyimmunotherapy
Palabras clave
Programa(s)
Régimen de financiación
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinador
75231 Paris
Francia