Journal
INTERNATIONAL IMMUNOLOGY
Volume 20, Issue 12, Pages 1517-1525Publisher
OXFORD UNIV PRESS
DOI: 10.1093/intimm/dxn111
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Funding
- OTKA [T049463, F060540]
- ETT [50053-2006]
- Hungarian Academy of Sciences
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The anti-tumor response of human invariant NKT (NKT) cells is well established. A novel T cell subset, mucosal-associated invariant T (MAIT) cells, possesses similar regulatory properties to NKT cells in autoimmune models and disease. Here, we examined the clonality of four T cell subsets expressing invariant alpha TCR, including V alpha 7.2-J alpha 33 of MAIT cells, in 19 kidney and brain tumors. The MAIT clonotype was identified and co-expressed with NKT clonotype in half of the tumors. In contrast, two other invariant T cell clonotypes (V alpha 4 and V alpha 19) were not present in tumors. Such tumors also expressed V beta 2 and V beta 13, the restricted TCR beta chain of MAIT cells and the antigen-presenting molecule MR1. A high percentage of infiltrating T cells was CD8+ and expressed HLA-DR suggesting activation. Although the MAIT alpha TCR was identified in both peripheral CD56+ and CD56- subsets, infiltrating lymphocytes were CD56 negative. The clonal presence of MAIT cells in tumors correlated with the expression of pro-inflammatory cytokines but no IL-4, IL-5 and IL-10, suggesting that a pro-inflammatory subset of human MAIT cells may exist. Our data imply that a CD56- subset of MAIT cells may participate in tumor immune responses similarly to NKT cells.
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