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- Title
Imatinib impairs CD8+ T lymphocytes specifically directed against the leukemia-associated antigen RHAMM/CD168 in vitro.
- Authors
Jinfei Chen; Schmitt, Anita; Baoan Chen; Rojewski, Markus; Ringhoffer, Mark; von Harsdorf, Stephanie; Greiner, Jochen; Guillaume, Philippe; Döhner, Hartmut; Bunjes, Donald; Schmitt, Michael
- Abstract
The Bcr-Abl tyrosine kinase inhibitor imatinib mesylate is highly effective in the front-line treatment of chronic myeloid leukemia (CML) and is increasingly used in patients with residual disease or relapse after allogeneic stem cell transplantation (allo-SCT). Since an impairment of anti-viral CD8+ T-lymphocyte function by imatinib has been described, we question whether imatinib also affects specific anti-leukemic CD8+ T lymphocytes generated from the peripheral blood of healthy donors, and of CML patients after allo-SCT. Here, we assessed CD8+ T-cell expansion and function from healthy donors and patients with CML. The release of IFN-γ and granzyme B by CD8+ T-lymphocytes specific for R3, a recently described T-cell epitope peptide derived from a leukemia-associated antigen designated RHAMM/CD168 (receptor for hyaluronic acid mediated motility), was inhibited by imatinib in a dose-dependent fashion (range: 1–25 μM). These T cells were able to lyse cognate peptide labeled T2 cells and CD34+ CML progenitor cells. This lysis was inhibited by imatinib. The inhibitory effect was not associated with an increased rate of apoptosis of T cells and reversible after removal of imatinib. In the light of these findings, clinical administration of imatinib might result in the reduction of efficacy of the graft-versus-leukemia effect or other T-cell-based immunotherapies.
- Subjects
IMATINIB; PROTEIN-tyrosine kinases; CHRONIC myeloid leukemia; T cells; LYMPHOCYTES; LEUKEMIA complications
- Publication
Cancer Immunology, Immunotherapy, 2007, Vol 56, Issue 6, p849
- ISSN
0340-7004
- Publication type
Article
- DOI
10.1007/s00262-006-0232-9