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ABL2 suppresses FLT3-ITD-induced cell proliferation through negative regulation of AKT signaling

Kazi, Julhash U LU ; Rupar, Kaja LU ; Marhäll, Alissa LU ; Moharram, Sausan A LU ; Khanum, Fatima; Shah, Kinjal LU ; Mohiuddin, Gazi LU ; Mysore Nagaraj, Sachin Raj LU ; Sun, Jianmin LU and Chougule, Rohit A LU , et al. (2017) In Oncotarget 8(7). p.12194-12202
Abstract

The type III receptor tyrosine kinase FLT3 is one of the most commonly mutated oncogenes in acute myeloid leukemia (AML). Inhibition of mutated FLT3 in combination with chemotherapy has displayed promising results in clinical trials. However, one of the major obstacles in targeting FLT3 is the development of resistant disease due to secondary mutations in FLT3 that lead to relapse. FLT3 and its oncogenic mutants signal through associating proteins that activate downstream signaling. Thus, targeting proteins that interact with FLT3 and their downstream signaling cascades can be an alternative approach to treat FLT3-dependent AML. We used an SH2 domain array screen to identify novel FLT3 interacting proteins and identified ABL2 as a... (More)

The type III receptor tyrosine kinase FLT3 is one of the most commonly mutated oncogenes in acute myeloid leukemia (AML). Inhibition of mutated FLT3 in combination with chemotherapy has displayed promising results in clinical trials. However, one of the major obstacles in targeting FLT3 is the development of resistant disease due to secondary mutations in FLT3 that lead to relapse. FLT3 and its oncogenic mutants signal through associating proteins that activate downstream signaling. Thus, targeting proteins that interact with FLT3 and their downstream signaling cascades can be an alternative approach to treat FLT3-dependent AML. We used an SH2 domain array screen to identify novel FLT3 interacting proteins and identified ABL2 as a potent interacting partner of FLT3. To understand the role of ABL2 in FLT3-mediated biological and cellular events, we used the murine pro-B cell line Ba/F3 as a model system. Overexpression of ABL2 in Ba/F3 cells expressing an oncogenic mutant of FLT3 (FLT3-ITD) resulted in partial inhibition of FLT3-ITD-dependent cell proliferation and colony formation. ABL2 expression did not alter the kinase activity of FLT3, its ubiquitination or its stability. However, it partially blocked FLT3-induced AKT phosphorylation without affecting ERK1/2 and p38 activation. Taken together our data suggest that ABL2 acts as negative regulator of signaling downstream of FLT3.

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Contribution to journal
publication status
published
subject
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Oncotarget
volume
8
issue
7
pages
12194 - 12202
publisher
Impact Journals, LLC
external identifiers
  • scopus:85012869363
  • wos:000394187400125
ISSN
1949-2553
DOI
10.18632/oncotarget.14577
language
English
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yes
id
1eb13ce5-996b-4357-aa33-5c31c867f7b6
date added to LUP
2017-02-17 14:51:44
date last changed
2017-11-05 05:13:56
@article{1eb13ce5-996b-4357-aa33-5c31c867f7b6,
  abstract     = {<p>The type III receptor tyrosine kinase FLT3 is one of the most commonly mutated oncogenes in acute myeloid leukemia (AML). Inhibition of mutated FLT3 in combination with chemotherapy has displayed promising results in clinical trials. However, one of the major obstacles in targeting FLT3 is the development of resistant disease due to secondary mutations in FLT3 that lead to relapse. FLT3 and its oncogenic mutants signal through associating proteins that activate downstream signaling. Thus, targeting proteins that interact with FLT3 and their downstream signaling cascades can be an alternative approach to treat FLT3-dependent AML. We used an SH2 domain array screen to identify novel FLT3 interacting proteins and identified ABL2 as a potent interacting partner of FLT3. To understand the role of ABL2 in FLT3-mediated biological and cellular events, we used the murine pro-B cell line Ba/F3 as a model system. Overexpression of ABL2 in Ba/F3 cells expressing an oncogenic mutant of FLT3 (FLT3-ITD) resulted in partial inhibition of FLT3-ITD-dependent cell proliferation and colony formation. ABL2 expression did not alter the kinase activity of FLT3, its ubiquitination or its stability. However, it partially blocked FLT3-induced AKT phosphorylation without affecting ERK1/2 and p38 activation. Taken together our data suggest that ABL2 acts as negative regulator of signaling downstream of FLT3.</p>},
  author       = {Kazi, Julhash U and Rupar, Kaja and Marhäll, Alissa and Moharram, Sausan A and Khanum, Fatima and Shah, Kinjal and Mohiuddin, Gazi and Mysore Nagaraj, Sachin Raj and Sun, Jianmin and Chougule, Rohit A and Rönnstrand, Lars},
  issn         = {1949-2553},
  language     = {eng},
  month        = {01},
  number       = {7},
  pages        = {12194--12202},
  publisher    = {Impact Journals, LLC},
  series       = {Oncotarget},
  title        = {ABL2 suppresses FLT3-ITD-induced cell proliferation through negative regulation of AKT signaling},
  url          = {http://dx.doi.org/10.18632/oncotarget.14577},
  volume       = {8},
  year         = {2017},
}