University of Cambridge > Talks.cam > Immunology in Pathology > Memory CD4 T cell generation and survival within secondary lymphoid tissue

Memory CD4 T cell generation and survival within secondary lymphoid tissue

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Sue Griffin.

Host: Jim Kaufman, jfk31@cam.ac.uk

CD4 T cell responses are initiated within secondary lymphoid tissue and it is within this tissue that memory CD4 T cells remain. Maintaining memory CD4 T cells is pivotal to the success of vaccination. By analysing physiological CD4 T cell responses, using a combination of MHC II tetramers and transfers of small numbers of TCR transgenic T cells, we are dissecting the signals and cells required for the generation and survival of memory CD4 T cells. Mice deficient in lymphotoxin  receptor, which lack the characteristic architecture of secondary lymphoid tissue, are unable to maintain memory CD4 T cells, indicating that cellular interactions are important for this persistence.

We have identified lymphoid tissue inducer cells, a RORgamma-dependent population responsible for the formation of lymph nodes, as key cells in sustaining memory CD4 T cells within secondary lymphoid tissue. Although primary responses appear normal in the absence of RORgamma, antigen specific memory CD4 T cells do not persist and these mice cannot mount memory antibody responses. Transfer of antigen-specific memory CD4 T cells into mice with or without lymphoid tissue inducer cells demonstrated that these cells were sufficient for maintaining memory CD4 T cells, likely through provision of OX40L signals.

We are currently further analysing the role of lymphoid tissue inducer cells within CD4 T cell responses and investigating the requirement for costimulatory molecules.

This talk is part of the Immunology in Pathology series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2019 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity