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Effect of H2O2 on Na,K-ATPase

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Abstract

Na,K-ATPase is a member of the P-type ATPase family, which transforms the energy of ATP to the transmembrane Na/K gradient that is used to create membrane potential, support the excitability of neurons and myocytes, control pH, and transport substances. The regulation of the Na,K-ATPase function by physiological regulators also comprises a central role in the adaptation of organisms to different conditions. H2O2 is one of the main signaling molecules in redox metabolism and plays important function in cellular physiology. H2O2 also regulates signaling pathways via the specific oxidation of proteins harboring redox-sensitive moieties, like metal centers or cysteine residues, which control their activity. The Na,K-ATPase is redox-sensitive with an “optimal redox potential range,” where the reactive oxygen species (ROS), levels beyond this “optimal range” are responsible for enzyme inhibition. Thus reactive oxygen species manifest a hermetic effect, which is expressed by biphasic action; stimulation by low doses and inhibition by high doses. This study was aimed to reveal redox-sensitivity of brain synaptic membrane fractions Na,K-ATPase via H2O2 effects. Different concentrations of H2O2 change the kinetic parameters of the enzyme system for MgATP complex, Na+, and K+ differently. Moreover, H2O2 changes p-chloromercuribenzoic acids (PCMB) affinity. H2O2 targets thiols of the Na,K-ATPase – low and high concentrations of H2O2 change the oxidative state of thiolate (S‐) from Cys differently, resulting in the corresponding activation or inhibition of the enzyme. Targeting thiols of the Na,K-ATPase tunes the activity of the Na,K-ATPase to the cellular demands and sustains the enzyme activity at the “optimal” level.

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All co-authors participated in the research and article preparation.

All authors conceived and designed the study. All authors contributed to manuscript revision and approved the final version of the manuscript.

Gvantsa Chkadua—performed the experiments, formulated hypotheses, developed study objectives, defined experimental, statistical, and analytical approaches, analyzed the data, researched the literature, and wrote the paper.

Eka Nozadze—performed the experiments, theoretical calculation, data analysis (statistical or other), and researched the literature.

Leila Tsakadze—conducted the experiments, and contributed to acquisition, analysis and interpretation of the data.

Lia Shioshvili—conducted the experiments, and contributed to acquisition, analysis and interpretation of the data.

Nana Arutinova—performed the experiments, and collected and analyzed the data.

Marine Leladze—performed the experiments, and collected and analyzed the data.

Sopio Dzneladze—performed the experiments, and collected and analyzed the data.

Maia Javakhishvili—performed the experiments, and collected and analyzed the data.

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Correspondence to Gvantsa Chkadua.

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The rats experienced no suffering prior to death, as their death was caused by decapitation. All experiments were approved by the animal care and use committee at the I. Beritashvili Center of Experimental Biomedicine.

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Chkadua, G., Nozadze, E., Tsakadze, L. et al. Effect of H2O2 on Na,K-ATPase. J Bioenerg Biomembr 54, 241–249 (2022). https://doi.org/10.1007/s10863-022-09948-1

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  • DOI: https://doi.org/10.1007/s10863-022-09948-1

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