Abstract:
OBJECTIVE:We tested the hypothesis that skeletal muscle of endurance-trained male runners would exhibit elevated autophagy and mitophagy markers, which would be associated with greater metabolic flexibility following a high-fat meal (HFM). METHODS:Muscle biopsies were collected to determine differences in autophagy and mitophagy protein markers and metabolic flexibility under fasting conditions and 4 h following a HFM between endurance-trained male runners (n = 10) and sedentary, non-obese controls (n = 9). RESULTS:Maximal oxygen consumption (ml·kg·min-1) was approximately 50% higher (p < 0.05) in endurance-trained runners compared with sedentary controls (65.8 ± 2.3 and 43.1 ± 3.4, respectively). Autophagy markers were similar between groups. Mitophagy and mitochondrial dynamics protein markers were significantly higher in skeletal muscle of endurance-trained runners compared with sedentary controls in the fasted state, although unaffected by the HFM. Skeletal muscle metabolic flexibility was similar between groups when fasted (p > 0.05), but increased in response to the HFM in endurance-trained athletes only (p < 0.005). Key mitophagy markers, phospho-Pink1Thr257 and phospho-ParkinS65 (r = 0.64, p < 0.005), and phospo-ParkinSer65 and phospho-Drp1Ser616 (r = 0.70, p < 0.05) were correlated only within the endurance-trained group. Autophagy and mitophagy markers were not correlated with metabolic flexibility. CONCLUSION:In summary, mitophagy may be enhanced in endurance-trained runners based on elevated markers of mitophagy and mitochondrial dynamics. The HFM did not alter autophagy or mitophagy in either group. The absence of a relationship between mitophagy markers and metabolic flexibility suggests that mitophagy is not a key determinant of metabolic flexibility in a healthy population, but further investigation is warranted.
journal_name
Mol Metabjournal_title
Molecular metabolismauthors
Tarpey MD,Davy KP,McMillan RP,Bowser SM,Halliday TM,Boutagy NE,Davy BM,Frisard MI,Hulver MWdoi
10.1016/j.molmet.2017.10.006subject
Has Abstractpub_date
2017-12-01 00:00:00pages
1597-1609issue
12issn
2212-8778pii
S2212-8778(17)30664-6journal_volume
6pub_type
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journal_title:Molecular metabolism
pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Molecular metabolism
pub_type: 杂志文章
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journal_title:Molecular metabolism
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journal_title:Molecular metabolism
pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1016/j.molmet.2018.05.013
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
doi:10.1016/j.molmet.2015.12.006
更新日期:2016-01-14 00:00:00
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journal_title:Molecular metabolism
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doi:10.1016/j.molmet.2016.04.003
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doi:10.1016/j.molmet.2020.101041
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doi:10.1016/j.molmet.2019.05.004
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journal_title:Molecular metabolism
pub_type: 杂志文章
doi:10.1016/j.molmet.2016.05.001
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journal_title:Molecular metabolism
pub_type: 杂志文章,评审
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journal_title:Molecular metabolism
pub_type: 杂志文章
doi:10.1016/j.molmet.2014.09.006
更新日期:2014-09-28 00:00:00
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journal_title:Molecular metabolism
pub_type: 杂志文章
doi:10.1016/j.molmet.2019.04.010
更新日期:2019-07-01 00:00:00
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journal_title:Molecular metabolism
pub_type: 杂志文章
doi:10.1016/j.molmet.2017.11.003
更新日期:2018-01-01 00:00:00
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journal_title:Molecular metabolism
pub_type: 杂志文章
doi:10.1016/j.molmet.2015.04.005
更新日期:2015-05-02 00:00:00
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pub_type: 杂志文章
doi:10.1016/j.molmet.2020.101057
更新日期:2020-12-01 00:00:00