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. 2025 Feb 4;37(2):477-495.e11.
doi: 10.1016/j.cmet.2024.10.021. Epub 2024 Nov 26.

Mitochondrial calcium uptake declines during aging and is directly activated by oleuropein to boost energy metabolism and skeletal muscle performance

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Free article

Mitochondrial calcium uptake declines during aging and is directly activated by oleuropein to boost energy metabolism and skeletal muscle performance

Gaia Gherardi et al. Cell Metab. .
Free article

Abstract

Mitochondrial calcium (mtCa2+) uptake via the mitochondrial calcium uniporter (MCU) couples calcium homeostasis and energy metabolism. mtCa2+ uptake via MCU is rate-limiting for mitochondrial activation during muscle contraction, but its pathophysiological role and therapeutic application remain largely uncharacterized. By profiling human muscle biopsies, patient-derived myotubes, and preclinical models, we discovered a conserved downregulation of mitochondrial calcium uniporter regulator 1 (MCUR1) during skeletal muscle aging that associates with human sarcopenia and impairs mtCa2+ uptake and mitochondrial respiration. Through a screen of 5,000 bioactive molecules, we identify the natural polyphenol oleuropein as a specific MCU activator that stimulates mitochondrial respiration via mitochondrial calcium uptake 1 (MICU1) binding. Oleuropein activates mtCa2+ uptake and energy metabolism to enhance endurance and reduce fatigue in young and aged mice but not in muscle-specific MCU knockout (KO) mice. Our work demonstrates that impaired mtCa2+ uptake contributes to mitochondrial dysfunction during aging and establishes oleuropein as a novel food-derived molecule that specifically targets MCU to stimulate mitochondrial bioenergetics and muscle performance.

Keywords: MCU; MCUR1; aging; calcium signaling; endurance; energy; fatigue; mitochondria; polyphenols; sarcopenia; skeletal muscle.

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Conflict of interest statement

Declaration of interests The authors A.W., F.B., B. Brinon, G.E.J., A.H., E.M., D.B., J.N.F., and U.D.M. are employees of Nestlé Research, which is part of the Société des Produits Nestlé SA (SPN). SPN has filed patents on the use of oleuropein for muscle and mitochondrial health. K.M.G. has received reimbursement for speaking at conferences sponsored by companies selling nutritional products and is part of an academic consortium that has received research funding from Bayer, Société des Produits Nestlé SA, BenevolentAI Bio Ltd., and Danone.

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