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Characterisation of L-Type Amino Acid Transporter 1 (LAT1) Expression in Human Skeletal Muscle by Immunofluorescent Microscopy

Abstract

The branch chain amino acid leucine is a potent stimulator of protein synthesis in skeletal muscle. Leucine rapidly enters the cell via the L-Type Amino Acid Transporter 1 (LAT1); however, little is known regarding the localisation and distribution of this transporter in human skeletal muscle. Therefore, we applied immunofluorescence staining approaches to visualise LAT1 in wild type (WT) and LAT1 muscle-specific knockout (mKO) mice, in addition to basal human skeletal muscle samples. LAT1 positive staining was visually greater in WT muscles compared to mKO muscle. In human skeletal muscle, positive LAT1 staining was noted close to the sarcolemmal membrane (dystrophin positive staining), with a greater staining intensity for LAT1 observed in the sarcoplasmic regions of type II fibres (those not stained positively for myosin heavy-chain 1, Type II-25.07 +/- 5.93, Type I-13.71 +/- 1.98, p < 0.01), suggesting a greater abundance of this protein in these fibres. Finally, we observed association with LAT1 and endothelial nitric oxide synthase (eNOS), suggesting LAT1 association close to the microvasculature. This is the first study to visualise the distribution and localisation of LAT1 in human skeletal muscle. As such, this approach provides a validated experimental platform to study the role and regulation of LAT1 in human skeletal muscle in response to various physiological and pathophysiological models.

Type Journal
ISBN 2072-6643 (Electronic) 2072-6643 (Linking)
Authors Hodson, N.; Brown, T.; Joanisse, S.; Aguirre, N.; West, D. W. D.; Moore, D. R.; Baar, K.; Breen, L.; Philp, A.
Responsible Garvan Author Dr Andy Philp
Publisher Name Nutrients
Published Date 2017-12-26
Published Volume 10
Published Issue 1
Published Pages pii: E23
Status Published in-print
DOI 10.3390/nu10010023
URL link to publisher's version https://www.ncbi.nlm.nih.gov/pubmed/29278358