The juxtamembrane domain in ETV6/FLT3 is critical for PIM-1 up-regulation and cell proliferation.

Abstract:

:We recently reported that the ETV6/FLT3 fusion protein conferred interleukin-3-independent growth on Ba/F3 cells. The present study has been conducted to assess role of the juxtamembrane domain of FLT3 for signal transduction and cell transformation. The wild-type ETV6/FLT3 fusion protein in transfected cells was a constitutively activated tyrosine kinase that led to up-regulation of PIM-1 and activations of STAT5, AKT, and MAPK. Deletion of the juxtamembrane domain abrogated interleukin-3-independent growth of the transfected cells and PIM-1 up-regulation, whereas it retained compatible levels of phosphorylations of STAT5, AKT, and MAPK. Further deletion of N-terminal region of the tyrosine kinase I domain of FLT3 completely abolished these phosphorylations. Our data indicate that the juxtamembrane domain of FLT3 in ETV6/FLT3 fusion protein is critical for cell proliferation and PIM-1 up-regulation that might be independent of a requirement for signaling through STAT5, MAPK, and AKT pathways.

authors

Vu HA,Xinh PT,Kano Y,Tokunaga K,Sato Y

doi

10.1016/j.bbrc.2009.03.157

subject

Has Abstract

pub_date

2009-06-05 00:00:00

pages

308-13

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(09)00659-7

journal_volume

383

pub_type

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