The immune inhibitory receptor osteoactivin is upregulated in monocyte-derived dendritic cells by BCR-ABL tyrosine kinase inhibitors

Cancer Immunol Immunother. 2012 Feb;61(2):193-202. doi: 10.1007/s00262-011-1096-1. Epub 2011 Aug 27.


Multiple approaches presently aim to combine targeted therapies using tyrosine kinase inhibitors with immunotherapy. Ex vivo-generated dendritic cells are frequently used in such strategies due to their unique ability to initiate primary T-cell immune responses. Besides governing tumor cell growth, many kinases targeted by tyrosine kinase inhibitors are involved in the development and function of dendritic cells and thus tyrosine kinase inhibitor therapy may cause immunoinhibitory side effects. We here report that exposure of developing human monocyte-derived dendritic cells to the BCR-ABL inhibitors imatinib, dasatinib, and nilotinib results in profound upregulation of the transmembrane glycoprotein osteoactivin that has recently been characterized as a negative regulator of T-cell activation. Thus, in line with osteoactivin upregulation, exposure to tyrosine kinase inhibitors resulted in significantly reduced stimulatory capacity of dendritic cells in mixed lymphocyte reactions that could be restored by the addition of blocking anti-osteoactivin antibody. Our data demonstrate that tyrosine kinase inhibitor-mediated inhibition of dendritic cell function is, at least in great part, mediated by upregulation of the immune inhibitory molecule osteoactivin.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies, Monoclonal / metabolism
  • Benzamides
  • Cells, Cultured
  • Dasatinib
  • Dendritic Cells / drug effects*
  • Dendritic Cells / immunology
  • Dendritic Cells / metabolism
  • Dendritic Cells / pathology
  • Fusion Proteins, bcr-abl / antagonists & inhibitors
  • Humans
  • Imatinib Mesylate
  • Immunotherapy*
  • Lymphocyte Activation / drug effects
  • Lymphocyte Culture Test, Mixed
  • Membrane Glycoproteins / genetics
  • Membrane Glycoproteins / immunology
  • Membrane Glycoproteins / metabolism*
  • Molecular Targeted Therapy
  • Piperazines / pharmacology
  • Protein-Tyrosine Kinases / antagonists & inhibitors
  • Pyrimidines / pharmacology
  • T-Lymphocytes / immunology
  • T-Lymphocytes / metabolism*
  • T-Lymphocytes / pathology
  • Thiazoles / pharmacology
  • Up-Regulation* / drug effects


  • 4-methyl-N-(3-(4-methylimidazol-1-yl)-5-(trifluoromethyl)phenyl)-3-((4-pyridin-3-ylpyrimidin-2-yl)amino)benzamide
  • Antibodies, Monoclonal
  • Benzamides
  • GPNMB protein, human
  • Membrane Glycoproteins
  • Piperazines
  • Pyrimidines
  • Thiazoles
  • Imatinib Mesylate
  • Protein-Tyrosine Kinases
  • Fusion Proteins, bcr-abl
  • Dasatinib