RNAi-induced down-regulation of FLT3 expression in AML cell lines increases sensitivity to MLN518

Denise K. Walters, Eric P. Stoffregen, Michael C. Heinrich, Michael W. Deininger, Brian J. Druker

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


FMS-like tyrosine kinase 3 (FLT3) is a receptor tyrosine kinase that is constitutively activated in approximately 30% of acute myelogenous leukemia (AML) patients and appears to confer an adverse prognosis. Thus, development of inhibitors and/or antibodies that specifically target FLT3 has been of substantial interest. In this regard, phase 1 and 2 trials Involving FLT3 inhibitors have recently reported FLT3 inhibition and leukemic blast reduction in some patients. Despite this, issues such as specificity and resistance need to be addressed. Consequently, the development of alternative approaches for targeting FLT3 would be of great consequence. In the present report, we demonstrate that FLT3 siRNA effectively down-regulates FLT3 expression in Ba/F3 cells transfected with FLT3 containing an activating internal tandem duplication (ITD) in the juxtamembrane domain and FLT3-ITD-positive Molm-14 human leukemia cells. Treatment with the FLT3 siRNA results in growth inhibition and apoptosis of these cells. Furthermore, siRNA-induced down-regulation of FLT3 increased the sensitivity of both cell lines to treatment with the FLT3 inhibitor MLN518. This illustrates the potential benefit of combined therapeutic approaches.

Original languageEnglish (US)
Pages (from-to)2952-2954
Number of pages3
Issue number7
StatePublished - Apr 1 2005

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


Dive into the research topics of 'RNAi-induced down-regulation of FLT3 expression in AML cell lines increases sensitivity to MLN518'. Together they form a unique fingerprint.

Cite this