How CD4+ T-cell help shapes functional and dysfunctional CD8+ T-cell differentiation

Busselaar, J.L.C.

Cytotoxic CD8+ T cells play an important role in the immune response against cancer. However, in tumors CD8+ T cells often don’t work very well. They divide less, look different and can’t kill their target cells efficiently. This dysfunctional state is called exhaustion. Previous research has shown that exhausted CD8+ T cells originate from a precursor population called ‘stem-like’ cells. How stem-like cells are formed, and why their development into effective cytotoxic CD8+ T cells is impaired in cancer, has been unclear.
My research shows that stem-like cells equal CD8+ T cells that did not receive help from helper CD4+ T cells during their activation. Using a mouse vaccination model, we showed that CD8+ T cells depend on CD4+ T-cell help to differentiate from stem-like cells into cytotoxic effector cells. In tumors these helped effector cells were not formed, suggesting that in cancer CD4+ T-cell help is not properly delivered. This new theory, which we call the ‘helpless...Show moreCytotoxic CD8+ T cells play an important role in the immune response against cancer. However, in tumors CD8+ T cells often don’t work very well. They divide less, look different and can’t kill their target cells efficiently. This dysfunctional state is called exhaustion. Previous research has shown that exhausted CD8+ T cells originate from a precursor population called ‘stem-like’ cells. How stem-like cells are formed, and why their development into effective cytotoxic CD8+ T cells is impaired in cancer, has been unclear.
My research shows that stem-like cells equal CD8+ T cells that did not receive help from helper CD4+ T cells during their activation. Using a mouse vaccination model, we showed that CD8+ T cells depend on CD4+ T-cell help to differentiate from stem-like cells into cytotoxic effector cells. In tumors these helped effector cells were not formed, suggesting that in cancer CD4+ T-cell help is not properly delivered. This new theory, which we call the ‘helpless dysfunction model’, may be an important underlying mechanism explaining CD8+ T-cell dysfunction and exhaustion in cancer. Our findings highlight CD4+ T-cell help as an important aspect to consider during the development of new immune therapies against cancer.
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How CD4+ T-cell help shapes functional and dysfunctional CD8+ T-cell differentiation