Abstract:
:Indoleamine 2,3-dioxygenase degrades the amino acid tryptophan which is essential for T cells. Tryptophan depletion causes T-cell cycle arrest and solid tumors that express high levels of indoleamine 2,3-dioxygenase can create immune suppression. Recently, blasts of patients with acute myeloid leukemia were shown to express indoleamine 2,3-dioxygenase. We determined INDO (encoding gene for indoleamine 2,3-dioxygenase) mRNA expression in leukemic blasts of 286 patients with acute myeloid leukemia by gene-expression profiling. Results were validated by quantitative polymerase chain reaction analysis in blasts of an independent cohort of 71 patients. High INDO expression was correlated to significantly shortened overall and relapse-free survival. Correlation of INDO expression to relevant known prognostic factors and survival identified high INDO expression as a strong negative independent predicting variable for overall and relapse-free survival. Inhibition of indoleamine 2,3-dioxygenase expressed by myeloid leukemic blasts may result in breaking immune tolerance and offers new therapeutic options for patients with acute myeloid leukemia.
journal_name
Haematologicajournal_title
Haematologicaauthors
Chamuleau ME,van de Loosdrecht AA,Hess CJ,Janssen JJ,Zevenbergen A,Delwel R,Valk PJ,Löwenberg B,Ossenkoppele GJdoi
10.3324/haematol.13113subject
Has Abstractpub_date
2008-12-01 00:00:00pages
1894-8issue
12eissn
0390-6078issn
1592-8721pii
93/12/1894journal_volume
93pub_type
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