Tumour infiltrated lymphocytes (TILs) contain tumour reactive T cells and have been used as adoptive cell transfer therapy in patients which can mediate cancer regression. However, without in vitro manipulation, TIL T cells are tolerant to tumour. Although it has been reported that PD1, a negative co-stimulatory molecule, could be induced highly in TIL T cells than T cells from peripheral, the intrinsic mechanisms for TIL T cells to resistant to tumour are largely unknown. The aim of the project is
to understand the mechanisms of Egr2 and 3 mediated T cell tolerance in tumour immunology. We will analyse the phenotype and function of Egr2 positive T cells in TILs using EG7 tumor model with GFP-Egr2 knockin mice; investigate what effects of Egr2/3 influence anti-tumour responses of T cells using Egr2/3 knockout and Egr2 overexpression transgenic mice; and understand how Egr2 and 3 expressions are regulated under tumour microenvironment, which may provide the potential bio-marks for tumour immune responses, and new strategy for individual immunotherapy of cancer patients.
Experimental Work.
1. Establish Eg7 tumor model in GFP-Egr2 knockin mice
2. Characterization of Egr2 positive TIL cells using EG7 tumor model with GFP-Egr2 knockin mice.
3. Examine the function of Egr2/3 positive or negative TIL T cells with proliferation assay, cytokine production and cytotoxic function to see the differences of sub-populations of TILs, providing the evidence why the novel immunotherapeutic strategy can be considered.
4. Define what are the role of Egr2 and 3 in regulation of tumour immune responses using Egr2/3 KO (Egr2/3 genes deleted in lymphocytes) and Egr2 Tg mice (Egr2 gene overexpressed in lymphocytes)
References:
Zhu B., Symonds A.L.J, Martin JE., Kioussis D., Wraith D., Li SL and Wang P. Early growth response gene 2 (Egr-2) controls the self-tolerance of T cells and development of lupus like autoimmune disease. Vol. 205, 2295-2307, J Exp. Medicine, 2008.
Suling Li, Tizong Miao, Meera Sebastian,Punamdip Bhullar,Emma Ghaffari,Mengya Liu,Alistair L.J. Symonds,and Ping Wang. The Transcription Factors Egr2 and Egr3 Are Essential for the Control of Inflammation and Antigen-Induced Proliferation of B and T Cells. Immunity 37, 1–12, October 19, 2012.
Gajewski TF, Schreiber H, Fu YX. Innate and adaptive immune cells in the tumor microenvironment. Nat Immunol. 2013;14:1014-22.
Harris, J.E., K. D. Bishop, N. E. Phillips, J. P. Mordes, D. L. Greiner, A. A. Rossini, M. P. Czech. 2004. Early growth response gene-2, a zinc-fi nger transcription factor, is required for full induction of clonal anergy in CD4+ T cells. J. Immunol. 173: 7331 – 7338.
Supervisor: Dr. Suling Li
Division: Biosciences