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The role of AMPK in regulation of Na+,K+-ATPase in skeletal muscle: does the gauge always plug the sink?

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Abstract

AMP-activated protein kinase (AMPK) is a cellular energy gauge and a major regulator of cellular energy homeostasis. Once activated, AMPK stimulates nutrient uptake and the ATP-producing catabolic pathways, while it suppresses the ATP-consuming anabolic pathways, thus helping to maintain the cellular energy balance under energy-deprived conditions. As much as ~ 20–25% of the whole-body ATP consumption occurs due to a reaction catalysed by Na+,K+-ATPase (NKA). Being the single most important sink of energy, NKA might seem to be an essential target of the AMPK-mediated energy saving measures, yet NKA is vital for maintenance of transmembrane Na+ and K+ gradients, water homeostasis, cellular excitability, and the Na+-coupled transport of nutrients and ions. Consistent with the model that AMPK regulates ATP consumption by NKA, activation of AMPK in the lung alveolar cells stimulates endocytosis of NKA, thus suppressing the transepithelial ion transport and the absorption of the alveolar fluid. In skeletal muscles, contractions activate NKA, which opposes a rundown of transmembrane ion gradients, as well as AMPK, which plays an important role in adaptations to exercise. Inhibition of NKA in contracting skeletal muscle accentuates perturbations in ion concentrations and accelerates development of fatigue. However, different models suggest that AMPK does not inhibit or even stimulates NKA in skeletal muscle, which appears to contradict the idea that AMPK maintains the cellular energy balance by always suppressing ATP-consuming processes. In this short review, we examine the role of AMPK in regulation of NKA in skeletal muscle and discuss the apparent paradox of AMPK-stimulated ATP consumption.

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Funding

S.P. and M.P. are supported by funding from the Slovenian Research Agency (Grants #P3-0043, #J7-8276, BI-HR/20-21-041, and the young researcher Grant to M.P.). A.V.C. is supported by the Swedish Research Council, the Novo Nordisk Research Foundation, the Strategic Research Programme in Diabetes at Karolinska Institutet, the Russian Scientific Foundation (RNF #19-15-00118). S.P. and A.V.C. are principal investigators of the bilateral cooperation project between Republic of Slovenia and the Russian Federation funded by the Slovenian Research Agency (BI-RU/19-20-039).

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S.P. and A.V.C. conceptualized the review paper. S.P. prepared the first draft of the paper. S.P. and M.P. prepared the first draft of the tables. All authors contributed to literature search and to writing of the subsequent versions of the manuscript.

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Correspondence to Sergej Pirkmajer or Alexander V. Chibalin.

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Pirkmajer, S., Petrič, M. & Chibalin, A.V. The role of AMPK in regulation of Na+,K+-ATPase in skeletal muscle: does the gauge always plug the sink?. J Muscle Res Cell Motil 42, 77–97 (2021). https://doi.org/10.1007/s10974-020-09594-3

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  • DOI: https://doi.org/10.1007/s10974-020-09594-3

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