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Exercise induces isoform-specific increase in 5'AMP-activated protein kinase activity in human skeletal muscle
Research Division, Joslin Diabetes Center, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
Research Division, Joslin Diabetes Center, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
Research Division, Joslin Diabetes Center, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
Research Division, Joslin Diabetes Center, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
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2000 (English)In: Biochemical and Biophysical Research Communications - BBRC, ISSN 0006-291X, E-ISSN 1090-2104, Vol. 273, no 3, p. 1150-1155Article in journal (Refereed) Published
Abstract [en]

The 5'AMP-activated protein kinase (AMPK) is stimulated by contractile activity in rat skeletal muscle. AMPK has emerged as an important signaling intermediary in the regulation of cell metabolism being linked to exercise-induced changes in muscle glucose and fatty acid metabolism. In the present study, we determined the effects of exercise on isoform-specific AMPK activity (alpha1 and alpha2) in human skeletal muscle. Needle biopsies of vastus lateralis muscle were obtained from seven healthy subjects at rest, after 20 and 60 min of cycle ergometer exercise at 70% of VO(2)max, and 30 min following the 60 min exercise bout. In comparison to the resting state, AMPK alpha2 activity significantly increased at 20 and 60 min of exercise, and remained at a higher level with 30 min of recovery. AMPK alpha1 activity tended to slightly decrease with 20 min of exercise at 70%VO(2)max; however, the change was not statistically significant. AMPK alpha1 activities were at basal levels at 60 min of exercise and 30 min of recovery. On a separate day, the same subjects exercised for 20 min at 50% of VO(2)max. Exercise at this intensity did not change alpha2 activity, and similar to exercise at 70% of VO(2)max, there was no significant change in alpha1 activity. In conclusion, exercise at a higher intensity for only 20 min leads to increases in AMPK alpha2 activity but not alpha1 activity. These results suggest that the alpha2-containing AMPK complex, rather than alpha1, may be involved in the metabolic responses to exercise in human skeletal muscle.

Place, publisher, year, edition, pages
San Diego, CA, USA: Academic Press, 2000. Vol. 273, no 3, p. 1150-1155
Keywords [en]
AMPK, exercise, glucose transport, skeletal
National Category
Medical and Health Sciences Physiology
Identifiers
URN: urn:nbn:se:oru:diva-64016DOI: 10.1006/bbrc.2000.3073ISI: 000088363700062PubMedID: 10891387Scopus ID: 2-s2.0-0000368683OAI: oai:DiVA.org:oru-64016DiVA, id: diva2:1172728
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Funding Agency:

NIAMS NIH HHS

Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2018-01-16Bibliographically approved

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Ljungqvist, Olle

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