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2015 ; 5
(ä): 13474
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Novel roles for LIX1L in promoting cancer cell proliferation through
ROS1-mediated LIX1L phosphorylation
#MMPMID26310847
Nakamura S
; Kahyo T
; Tao H
; Shibata K
; Kurabe N
; Yamada H
; Shinmura K
; Ohnishi K
; Sugimura H
Sci Rep
2015[Aug]; 5
(ä): 13474
PMID26310847
show ga
Herein, we report the characterization of Limb expression 1-like, (LIX1L), a
putative RNA-binding protein (RBP) containing a double-stranded RNA binding
motif, which is highly expressed in various cancer tissues. Analysis of
MALDI-TOF/TOF mass spectrometry and RNA immunoprecipitation-sequencing of
interacting proteins and the microRNAs (miRNAs) bound to LIX1L revealed that
LIX1L interacts with proteins (RIOK1, nucleolin and PABPC4) and miRNAs
(has-miRNA-520a-5p, -300, -216b, -326, -190a, -548b-3p, -7-5p and -1296) in
HEK-293 cells. Moreover, the reduction of phosphorylated Tyr(136) (pTyr(136)) in
LIX1L through the homeodomain peptide, PY136, inhibited LIX1L-induced cell
proliferation in vitro, and PY136 inhibited MKN45 cell proliferation in vivo. We
also determined the miRNA-targeted genes and showed that was apoptosis induced
through the reduction of pTyr(136). Moreover, ROS1, HCK, ABL1, ABL2, JAK3, LCK
and TYR03 were identified as candidate kinases responsible for the
phosphorylation of Tyr(136) of LIX1L. These data provide novel insights into the
biological significance of LIX1L, suggesting that this protein might be an RBP,
with implications for therapeutic approaches for targeting LIX1L in
LIX1L-expressing cancer cells.