Branched-chain Amino Acids and L-alanine Supplementation Ameliorate Calcium Dyshomeostasis in Sarcopenia: New Insights for Nutritional Interventions

Overview

Journal Front Pharmacol

Date 2024 Jul 4

PMID 38962308

Authors

Elena Conte

Paola Mantuano

Brigida Boccanegra

Paola Imbrici

Giorgia Dinoi

Roberta Lenti

Ornella Cappellari

Donato Cappetta

Antonella De Angelis

Liberato Berrino

Heather Gordish-Dressman

Gianluca Bianchini

Andrea Aramini

Marcello Allegretti

Antonella Liantonio

Annamaria De Luca

Affiliations

Soon will be listed here.

Abstract

During aging, sarcopenia and decline in physiological processes lead to partial loss of muscle strength, atrophy, and increased fatigability. Muscle changes may be related to a reduced intake of essential amino acids playing a role in proteostasis. We have recently shown that branched-chain amino acid (BCAA) supplements improve atrophy and weakness in models of muscle disuse and aging. Considering the key roles that the alteration of Ca-related homeostasis and store-operated calcium entry (SOCE) play in several muscle dysfunctions, this study has been aimed at gaining insight into the potential ability of BCAA-based dietary formulations in aged mice on various players of Ca dyshomeostasis. Seventeen-month-old male C57BL/6J mice received a 12-week supplementation with BCAAs alone or boosted with two equivalents of L-alanine (2-Ala) or with dipeptide L-alanyl-L-alanine (Di-Ala) in drinking water. Outcomes were evaluated on skeletal muscles indices vs. adult 3-month-old male C57BL/6J mice. Ca imaging confirmed a decrease in SOCE and an increase of resting Ca concentration in aged vs. adult mice without alteration in the canonical components of SOCE. Aged muscles vs adult muscles were characterized by a decrease in the expression of ryanodine receptor 1 (RyR1), the Sarco-Endoplasmic Reticulum Calcium ATPase (SERCA) pump, and sarcalumenin together with an alteration of the expression of mitsugumin 29 and mitsugumin 53, two recently recognized players in the SOCE mechanism. BCAAs, particularly the formulation BCAAs+2-Ala, were able to ameliorate all these alterations. These results provide evidence that Ca homeostasis dysfunction plays a role in the functional deficit observed in aged muscle and supports the interest of dietary BCAA supplementation in counteracting sarcopenia-related SOCE dysregulation.

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