Bychkov ML, Shulepko MA, Vasileva VY, Sudarikova AV, Kirpichnikov MP, Lyukmanova EN. ASIC1a Inhibitor mambalgin-2 Suppresses the Growth of Leukemia Cells by Cell Cycle Arrest.
Acta Naturae 2020;
12:101-116. [PMID:
32742733 PMCID:
PMC7385094 DOI:
10.32607/actanaturae.10949]
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Abstract
Although tyrosine kinase inhibitors have brought significant success in the
treatment of chronic myelogenous leukemia, the search for novel molecular
targets for the treatment of this disease remains relevant. Earlier, expression
of acid-sensing ion channels, ASIC1a, was demonstrated in the chronic
myelogenous leukemia K562 cells. Three-finger toxins from the black mamba
(Dendroaspis polylepis) venom, mambalgins, have been shown to
efficiently inhibit homo- and heteromeric channels containing the ASIC1a
subunit; however, their use as possible antitumor agents had not been examined.
In this work, using the patch-clamp technique, we detected, for the first time,
an activation of ASIC1a channels in the leukemia K562 cells in response to an
extracellular pH decrease. Recombinant mambalgin-2 was shown to inhibit ASIC1a
activity and suppress the proliferation of the K562 cells with a half-maximal
effective concentration (EC50) ~ 0.2 μM. Maximum mambalgin-2
inhibitory effect is achieved after 72 h of incubation with cells and when the
pH of the cell medium reaches ~ 6.6. In the K562 cells, mambalgin-2 caused
arrest of the cell cycle in the G1 phase and reduced the phosphorylation of G1
cell cycle phase regulators: cyclin D1 and cyclin-dependent kinase CDK4,
without affecting the activity of CDK6 kinase. Thus, recombinant mambalgin-2
can be considered a prototype of a new type of drugs for the treatment of
chronic myelogenous leukemia.
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