Gene Expression of Carnosine-related Enzymes and Transporters in Skeletal Muscle

Overview

Journal Eur J Appl Physiol

Specialty Physiology

Date 2012 Nov 6

PMID 23124893

Citations 32

Authors

Inge Everaert

Helene De Naeyer

Youri Taes

Wim Derave

Affiliations

Soon will be listed here.

Abstract

Chronic oral beta-alanine supplementation can elevate muscle carnosine (beta-alanyl-L-histidine) content and improve high-intensity exercise performance. However, the regulation of muscle carnosine levels is poorly understood. The uptake of the rate-limiting precursor beta-alanine and the enzyme catalyzing the dipeptide synthesis are thought to be key steps. The aims of this study were to investigate the expression of possible carnosine-related enzymes and transporters in both human and mouse skeletal muscle in response to carnosine-altering stimuli. Human gastrocnemius lateralis and mouse tibialis anterior muscle samples were subjected to HPLC and qPCR analysis. Mice were subjected to chronic oral supplementation of beta-alanine and carnosine or to orchidectomy (7 and 30 days, with or without testosterone replacement), stimuli known to, respectively, increase and decrease muscle carnosine and anserine. The following carnosine-related enzymes and transporters were expressed in human and/or mouse muscles: carnosine synthase (CARNS), carnosinase-2 (CNDP2), the carnosine/histidine transporters PHT1 and PHT2, the beta-alanine transporters TauT and PAT1, beta-alanine transaminase (ABAT) and histidine decarboxylase (HDC). Six of these genes showed altered expression in the investigated interventions. Orchidectomy led to decreased muscle carnosine content, which was paralleled with decreased TauT expression, whereas CARNS expression was surprisingly increased. Beta-alanine supplementation increased both muscle carnosine content and TauT, CARNS and ABAT expression, suggesting that muscles increase beta-alanine utilization through both dipeptide synthesis (CARNS) and deamination (ABAT) and further oxidation, in conditions of excess availability. Collectively, these data show that muscle carnosine homeostasis is regulated by nutritional and hormonal stimuli in a complex interplay between related transporters and enzymes.

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