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Critical role for free radicals on sprint exercise-induced CaMKII and AMPKα phosphorylation in human skeletal muscle.
MedLine Citation:
PMID:  23288553     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The extremely high energy demand elicited by sprint exercise is satisfied by an increase in oxygen consumption combined with a high glycolytic rate, leading to a marked lactate accumulation, increased AMP/ATP ratio, reduced NAD(+)/NADH.H(+) and muscle pH, which are accompanied by marked Thr(172)-AMPKα phosphorylation during the recovery period. To determine the role played by Reactive nitrogen and oxygen species (RNOS) on Thr(172)-AMPKα phosphorylation in response to cycling sprint exercise, nine voluntaries performed a single 30s sprint (Wingate test) in two occasions: one two hours after the ingestion of placebo (P) and another following the intake of antioxidants (A) (α-lipoic acid, vitamin C, and vitamin E), with a double blind design. Vastus lateralis muscle biopsies were obtained before, immediately after, 30 and 120 min post-sprint. Performance, muscle metabolism was similar during both sprints. The NAD(+)/NADH.H(+) ratio was similarly reduced (84%), and the AMP/ATP ratio similarly increased (x21 fold) immediately after the sprints. Thr(286)-CaMKII and Thr(172)-AMPKα phosphorylations were increased after the control sprint (P), but not when the sprints were preceded by the ingestion of antioxidants. Ser(485)-AMPKα1/Ser(491)-AMPKα2 phosphorylation, a known inhibitory mechanism of Thr(172)-AMPKα phosphorylation, was increased only in A. In conclusion, RNOS play a crucial role in AMPK-mediated signaling after sprint exercise in human skeletal muscle. Antioxidant ingestion two hours prior to sprint exercise abrogates the Thr(172)-AMPKα phosphorylation response observed after the ingestion of placebo by reducing CaMKII and increasing Ser(485)-AMPKα1/Ser(491)-AMPKα2 phosphorylation. Sprint performance, muscle metabolism, and the AMP/ATP and NAD(+)/NADH.H(+) ratios are not affected by the acute ingestion of antioxidants.
Authors:
David Morales-Alamo; Jesus Gustavo Ponce-Gonzalez; Amelia Guadalupe-Grau; Lorena Rodriguez-Garcia; Alfredo Santana; Roser Cussó; Mario Guerrero; Cecilia Dorado; Borja Guerra; Jose A L Calbet
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-3
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  -     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1University of Las Palmas de Gran Canaria.
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