Abstract
Ionomycin in conjunction with phorbol-12,13-dibutyrate (PDBu) is conventionally used as a stimulator to activate cells, especially original T cells. But we accidently found it had an entirely opposite action on malignant tumor cells derived from T cells. Thus, influence of ionomycin on human leukemia Jurkat T cell behaviors and its preliminary mechanistic process were explored in the presence of PDBu. Ionomycin could remarkably inhibit colony formation of the cells, and inhibitory rate of the cell proliferation was increased with ionomycin treatment in a dose- or time-related relationship, following the reduction of ERK1/2 and phosphorylated-ERK1/2 levels. However, a high dose of ionomycin might moderately repress mid-stage activation of the cells. It also blocked the cell entry at S-phase and G2/M-phase with the attenuation of transforming growth factor-β (TGF-β) level in the cells, and promoted the cell apoptosis following the augment of caspase-3 and cleaved caspase-3 in the cells. The dramatic elevation of [Ca2+]i and intracellular pH (pHi) was simultaneously followed by the above alteration of the cell behaviors. These results indicate that ionomycin may strongly inhibit human acute T lymphocyte leukemia progress in the presence of PDBu through the inhibition of ERK1/2 signaling, the activation of caspase-3 and the attenuation of TGF-β mediated by the [Ca2+]i and pHi enhancement, providing a novel insight into function and potential application of both ionomycin and PDBu.
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This work was supported by the National Natural Science Foundations of China (No 81172824, No 30971465, No 30471635).
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Wang, Y., Hao, W., Xing, R. et al. Ionomycin inhibits Jurkat T cell behaviors in the presence of phorbol-12,13-dibutyrate. Ann Hematol 93, 735–746 (2014). https://doi.org/10.1007/s00277-013-1955-2
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DOI: https://doi.org/10.1007/s00277-013-1955-2