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2018 ; 37
(14
): 1926-1938
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The miR-17/92 cluster is involved in the molecular etiology of the SCLL syndrome
driven by the BCR-FGFR1 chimeric kinase
#MMPMID29367757
Hu T
; Chong Y
; Qin H
; Kitamura E
; Chang CS
; Silva J
; Ren M
; Cowell JK
Oncogene
2018[Apr]; 37
(14
): 1926-1938
PMID29367757
show ga
MicroRNAs (miRNAs) have pathogenic roles in the development of a variety of
leukemias. Here we identify miRNAs that have important roles in the development
of B lymphomas resulting from the expression of the chimeric BCR-FGFR1 kinase.
The miR-17/92 cluster was particularly implicated and forced expression resulted
in increased cell proliferation, while inhibiting its function using miRNA
sponges reduced cell growth and induced apoptosis. Cells treated with the potent
BGJ389 FGFR1 inhibitor led to miR-17/92 downregulation, suggesting regulation by
FGFR1. Transient luciferase reporter assays and qRT-PCR detection of endogenous
miR-17/92 expression in stable transduced cell lines demonstrated that BCR-FGFR1
can regulate miR-17/92 expression. This positive association of miR-17/92 with
BCR-FGFR1 was also confirmed in primary mouse SCLL tissues and primary human CLL
samples. miR-17/92 promotes cell proliferation and survival by targeting CDKN1A
and PTEN in B-lymphoma cell lines and primary tumors. An inverse correlation in
expression levels was seen between miR-17/92 and both CDKN1A and PTEN in two
cohorts of CLL patients. Finally, in vivo engraftment studies demonstrated that
manipulation of miR-17/92 was sufficient to affect BCR-FGFR1-driven
leukemogenesis. Overall, our results define miR-17/92 as a downstream effector of
FGFR1 in BCR-FGFR1-driven B-cell lymphoblastic leukemia.
|Animals
[MESH]
|Cell Line, Tumor
[MESH]
|Cell Proliferation/genetics
[MESH]
|Female
[MESH]
|Gene Expression Regulation, Neoplastic
[MESH]
|HEK293 Cells
[MESH]
|Humans
[MESH]
|Lymphoma/*genetics/pathology
[MESH]
|Mice
[MESH]
|Mice, Inbred BALB C
[MESH]
|MicroRNAs/*genetics
[MESH]
|Multigene Family/physiology
[MESH]
|Oncogene Proteins, Fusion/*genetics
[MESH]
|Proto-Oncogene Proteins c-bcr/*genetics
[MESH]
|Receptor, Fibroblast Growth Factor, Type 1/*genetics
[MESH]