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2016 ; 48
(ä): 46-56
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TLE4 regulation of wnt-mediated inflammation underlies its role as a tumor
suppressor in myeloid leukemia
#MMPMID27486062
Shin TH
; Brynczka C
; Dayyani F
; Rivera MN
; Sweetser DA
Leuk Res
2016[Sep]; 48
(ä): 46-56
PMID27486062
show ga
The presence of AML1-ETO (RUNX1-CBF2T1), a fusion oncoprotein resulting from a
t(8;21) chromosomal translocation, has been implicated as a necessary but
insufficient event in the development of a subset of acute myeloid leukemias
(AML). While AML1-ETO prolongs survival and inhibits differentiation of
hematopoietic stem cells (HSC), other contributory events are needed for cell
proliferation and leukemogenesis. We have postulated that specific tumor
suppressor genes keep the leukemic potential of AML1-ETO in check. In studying
del(9q), one of the most common concomitant chromosomal abnormalities with
t(8;21), we identified the loss of an apparent tumor suppressor, TLE4, that
appears to cooperate with AML1-ETO to confer a leukemic phenotype. This study
sought to identify the molecular basis of this cooperation. We show that the loss
of TLE4 confers proliferative advantage to leukemic cells, simultaneous with an
upregulation of a pro- inflammatory signature mediated through aberrant increases
in Wnt signaling activity. We further demonstrate that inhibition of
cyclooxygenase (COX) activity partly reverses the pro-leukemic phenotype due to
TLE4 knockdown, pointing towards a novel therapeutic approach for myeloid
leukemia.