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2018 ; 6
(14
): e13796
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TRPM7-mediated spontaneous Ca(2+) entry regulates the proliferation and
differentiation of human leukemia cell line K562
#MMPMID30033625
Takahashi K
; Umebayashi C
; Numata T
; Honda A
; Ichikawa J
; Hu Y
; Yamaura K
; Inoue R
Physiol Rep
2018[Jul]; 6
(14
): e13796
PMID30033625
show ga
Continuous Ca(2+) influx is essential to maintain intracellular Ca(2+)
homeostasis and its dysregulation leads to a variety of cellular dysfunctions. In
this study, we explored the functional roles of spontaneous Ca(2+) influx for the
proliferation and differentiation of a human erythromyeloid leukemia cell line
K562. mRNA/protein expressions were assessed by the real-time RT-PCR, western
blotting, and immunocytochemical staining. Intracellular Ca(2+) concentration
([Ca(2+) ](i) ) and ionic currents were measured by fluorescent imaging and patch
clamping techniques, respectively. Cell counting/viability and colorimetric
assays were applied to assess proliferation rate and hemoglobin synthesis,
respectively. Elimination of extracellular Ca(2+) decreased basal [Ca(2+) ](i) in
proliferating K562 cells. Cation channel blockers such as SK&F96365, 2-APB,
Gd(3+) , and FTY720 dose dependently decreased basal [Ca(2+) ](i) . A
spontaneously active inward current (I(spont) ) contributive to basal [Ca(2+)
](i) was identified by the nystatin-perforated whole-cell recording. I(spont)
permeated Ca(2+) comparably to Na(+) , and was greatly eliminated by siRNA
targeting TRPM7, a melastatin member of the transient receptor potential (TRP)
superfamily. Consistent with these findings, TRPM7 immune reactivity was detected
by western blotting, and immunofluorescence representing TRPM7 was found
localized to the K562 cell membrane. Strikingly, all these procedures, that is,
Ca(2+) removal, TRPM7 blockers and siRNA-mediated TRPM7 knockdown significantly
retarded the growth and suppressed hemin-induced ?-globin and hemoglobin
syntheses in K562 cells, respectively, both of which appeared associated with the
inhibition of ERK activation. These results collectively suggest that spontaneous
Ca(2+) influx through constitutively active TRPM7 channels may critically
regulate both proliferative and erythroid differentiation potentials of K562
cells.