Effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscle
Abstract Growing evidence shows that lactate is not merely an intermediate metabolite, but also a potential signaling molecule. However, whether daily lactate administration induces physiological adaptations in skeletal muscle remains to be elucidated. In this study, we first investigated the effect...
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doaj-64f469b3900f490691067e0c6bf2604a2020-11-25T03:51:11ZengWileyPhysiological Reports2051-817X2019-09-01717n/an/a10.14814/phy2.14224Effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscleKenya Takahashi0Yu Kitaoka1Yutaka Matsunaga2Hideo Hatta3Department of Sports Sciences The University of Tokyo Tokyo JapanDepartment of Human Sciences Kanagawa University Kanagawa JapanDepartment of Sports Sciences The University of Tokyo Tokyo JapanDepartment of Sports Sciences The University of Tokyo Tokyo JapanAbstract Growing evidence shows that lactate is not merely an intermediate metabolite, but also a potential signaling molecule. However, whether daily lactate administration induces physiological adaptations in skeletal muscle remains to be elucidated. In this study, we first investigated the effects of daily lactate administration (equivalent to 1 g/kg of body weight) for 3 weeks on mitochondrial adaptations in skeletal muscle. We demonstrated that 3‐week lactate administration increased mitochondrial enzyme activity (citrate synthase, 3‐hydroxyacyl CoA dehydrogenase, and cytochrome c oxidase) in the plantaris muscle, but not in the soleus muscle. MCT1 and MCT4 protein contents were not different after 3‐week lactate administration. Next, we examined whether lactate administration enhances training‐induced adaptations in skeletal muscle. Lactate administration prior to endurance exercise training (treadmill running, 20 m/min, 60 min/day), which increased blood lactate concentration during exercise, enhanced training‐induced mitochondrial enzyme activity in the skeletal muscle after 3 weeks. MCT protein content and blood lactate removal were not different after 3‐week lactate administration with exercise training compared to exercise training alone. In a single bout experiment, lactate administration did not change the phosphorylation state of AMPK, ACC, p38 MAPK, and CaMKII in skeletal muscle. Our results suggest that lactate can be a key factor for exercise‐induced mitochondrial adaptations, and that the efficacy of high‐intensity training is, at least partly, attributed to elevated blood lactate concentration.https://doi.org/10.14814/phy2.14224Lactatemitochondriamonocarboxylate transporterskeletal muscle |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kenya Takahashi Yu Kitaoka Yutaka Matsunaga Hideo Hatta |
spellingShingle |
Kenya Takahashi Yu Kitaoka Yutaka Matsunaga Hideo Hatta Effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscle Physiological Reports Lactate mitochondria monocarboxylate transporter skeletal muscle |
author_facet |
Kenya Takahashi Yu Kitaoka Yutaka Matsunaga Hideo Hatta |
author_sort |
Kenya Takahashi |
title |
Effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscle |
title_short |
Effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscle |
title_full |
Effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscle |
title_fullStr |
Effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscle |
title_full_unstemmed |
Effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscle |
title_sort |
effects of lactate administration on mitochondrial enzyme activity and monocarboxylate transporters in mouse skeletal muscle |
publisher |
Wiley |
series |
Physiological Reports |
issn |
2051-817X |
publishDate |
2019-09-01 |
description |
Abstract Growing evidence shows that lactate is not merely an intermediate metabolite, but also a potential signaling molecule. However, whether daily lactate administration induces physiological adaptations in skeletal muscle remains to be elucidated. In this study, we first investigated the effects of daily lactate administration (equivalent to 1 g/kg of body weight) for 3 weeks on mitochondrial adaptations in skeletal muscle. We demonstrated that 3‐week lactate administration increased mitochondrial enzyme activity (citrate synthase, 3‐hydroxyacyl CoA dehydrogenase, and cytochrome c oxidase) in the plantaris muscle, but not in the soleus muscle. MCT1 and MCT4 protein contents were not different after 3‐week lactate administration. Next, we examined whether lactate administration enhances training‐induced adaptations in skeletal muscle. Lactate administration prior to endurance exercise training (treadmill running, 20 m/min, 60 min/day), which increased blood lactate concentration during exercise, enhanced training‐induced mitochondrial enzyme activity in the skeletal muscle after 3 weeks. MCT protein content and blood lactate removal were not different after 3‐week lactate administration with exercise training compared to exercise training alone. In a single bout experiment, lactate administration did not change the phosphorylation state of AMPK, ACC, p38 MAPK, and CaMKII in skeletal muscle. Our results suggest that lactate can be a key factor for exercise‐induced mitochondrial adaptations, and that the efficacy of high‐intensity training is, at least partly, attributed to elevated blood lactate concentration. |
topic |
Lactate mitochondria monocarboxylate transporter skeletal muscle |
url |
https://doi.org/10.14814/phy2.14224 |
work_keys_str_mv |
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