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2016 ; 7
(43
): 69625-69637
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The pathophysiological significance of PPM1D and therapeutic targeting of
PPM1D-mediated signaling by GSK2830371 in mantle cell lymphoma
#MMPMID27626308
Kojima K
; Maeda A
; Yoshimura M
; Nishida Y
; Kimura S
Oncotarget
2016[Oct]; 7
(43
): 69625-69637
PMID27626308
show ga
PPM1D is a serine/threonine phosphatase that negatively regulates key DNA damage
response proteins, such as p53, p38 MAPK, histone H2A.X, and ATM. We investigated
the pathophysiological significance of PPM1D and its therapeutic targeting by the
novel PPM1D inhibitor GSK2830371 in mantle cell lymphoma (MCL). Oncomine-based
analyses indicated increased PPM1D mRNA levels in MCL cells compared with their
normal counterpart cells. Higher PPM1D expression was associated with higher
expression of the proliferation gene signature and poorer prognosis in patients.
Eight MCL (three p53 wild-type and five mutant) cell lines were exposed to
GSK2830371. GSK2830371 inhibited the cell growth, being prominent in p53
wild-type cells. GSK2830371 induced apoptosis in sensitive cells, as evidenced by
induction of phosphatidylserine externalization and loss of mitochondrial
membrane potential. p53 knockdown de-sensitized cell sensitivity. GSK2830371
increased the levels of total and Ser15-phosphorylated p53, and p53 targets p21
and PUMA. GSK2830371 and the MDM2 inhibitor Nutlin-3a acted synergistically in
p53 wild-type cells. Interestingly, GSK2830371 sensitized MCL cells to bortezomib
and doxorubicin in p53 wild-type and mutant cells; p38 signaling appeared to be
involved in the GSK2830371/bortezomib lethality. PPM1D inhibition may represent a
novel therapeutic strategy for MCL, which can be exploited in combination
therapeutic strategies for MCL.
|Aminopyridines/*pharmacology/therapeutic use
[MESH]