Nilotinib hampers the proliferation and function of CD8+ T lymphocytes through inhibition of T cell receptor signalling.

Third Department of Internal Medicine, University of Ulm, Ulm, Germany.
Journal of Cellular and Molecular Medicine (Impact Factor: 3.7). 02/2008; 12(5B):2107-18. DOI: 10.1111/j.1582-4934.2008.00234.x
Source: PubMed

ABSTRACT The novel selective BCR-ABL Breakpoint cluster region--Abelson murine leukemia viral oncogene homolog 1 (BCR-AML) inhibitor nilotinib (AMN107) is a tyrosine kinase inhibitor that is more potent against leukaemia cells in vitro than imatinib. As nilotinib might be used in the context of allogeneic stem cell transplantation where CD8+ T lymphocytes play a pivotal role in the graft-versus-leukaemia (GVL) effect, we investigated effects of nilotinib on this lymphocyte subpopulation. Nilotinib inhibits phytohemagglutinin (PHA)-induced proliferation of CD8+T lymphocytes in vitro at therapeutically relevant concentrations (0.5-4 microM). The inhibition of CD8+ T lymphocytes specific for leukaemia or viral antigens through nilotinib was associated with a reduced expansion of antigen peptide specific CD8+ T lymphocytes and with a decreased release of interferon-gamma and granzyme B by these cells as analysed by flow cytometry and enzyme-linked immunospot (ELISPOT) assays. The inhibitory effect caused by nilotinib was two times stronger than by imatinib. These effects were mediated through the inhibition of the phosphorylation of ZAP-70, Lck and ERK 1/2 and the NF-kappaB signalling transduction pathway. Taken together, we observed a strong suppressive impact of nilotinib on the CD8+ T lymphocyte function which should be considered carefully in the framework of allogeneic stem cell transplantation or other T cell based immunotherapies.


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