TIM-3/Gal-9 interaction induces IFNγ-dependent IDO1 expression in acute myeloid leukemia blast cells

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Abstract

NK cells expressing TIM-3 show a marked increase in IFNγ production in response to acute myeloid leukemia (AML) blast cells that endogenously express Gal-9. Herein, we demonstrate that NK cell-mediated production of IFNγ, induced by TIM-3/Gal-9 interaction and released in bone marrow microenvironment, is responsible for IDO1 expression in AML blasts. IDO1-expressing AML blasts consequently down-regulate NK cell degranulation activity, by sustaining leukemia immune escape. Furthermore, the blocking of TIM-3/Gal-9 interaction strongly down-regulates IFNγ-dependent IDO1 activity. Thus, the inhibition of TIM-3/Gal-9 immune check point, which affects NK cell-dependent IFNγ production and the consequent IDO1 activation, could usefully integrate current chemotherapeutic approaches.

Original languageEnglish
Article number36
JournalJournal of Hematology and Oncology
Volume8
Issue number1
DOIs
Publication statusPublished - Apr 16 2015

Keywords

  • AML
  • Galectin-9
  • IDO1
  • Immune escape
  • NK cells

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research
  • Molecular Biology

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