Adenosine monophosphate-activated protein kinase status modulates kinetics of post-mortem pH decline and meat quality in pig Longissimus muscle

Abstract : AMP-activated protein kinase (AMPK) is a sensor of cellular energy status involved in regulation of glycogen metabolism and it influences meat quality by modulating post-mortem (p.m.) energy metabolism. This study aimed at evaluating the relationships between AMPK activity in the pig Longissimus muscle (LM) and the kinetics of p.m. pH decline. A total of 117 pigs exhibiting a high variability in muscle glycolytic potential (GP) (84 up to 212 µmol lactate/g fresh muscle) were used. Samples of LM were taken just after exsanguination (T0) to represent the in vivo situation, and then at 30 min (T30) and 24h p.m.. GP, pH at T30 (pH1) and at 24h (pHu) were determined. Total AMPK and its level of activation (pAMPK/total AMPK) were quantified at both T0 and T30 by immunoblotting. AMPK activation at T30 was positively correlated with pHu (r=0.40, p<0.001) and negatively with GP (r=-0.42, p<0.001) and pH1 (r=-0.23, p=0.01). A stepwise regression method (R2=0.52, p<0.001) identified GP, pH1 and pAMPK/total AMPK at T30 as the best predictors of pHu. Phosphorylation status of AMPK was also involved in the determination of pH1, but the model explained less variability of this trait (R2=0.22, p<0.001). Moreover, AMPK status at T0 and T30 were highly correlated (r=0.69, p<0.001), suggesting that a high in vivo level of phosphorylation of this enzyme could increase the rate and reduce the extent of pH decline. Altogether, this indicates that the control of AMPK activity during the rearing period seems to be an interesting way for modulating pork quality
Type de document :
Communication dans un congrès
57. International Congress of Meat Science and Technology, Aug 2011, Ghent (BE), Belgium. pp.4, 2011
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https://hal-agrocampus-ouest.archives-ouvertes.fr/hal-00841076
Contributeur : Catherine Cliquet <>
Soumis le : mercredi 3 juillet 2013 - 17:17:57
Dernière modification le : mercredi 21 mars 2018 - 16:08:10

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  • HAL Id : hal-00841076, version 1

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Justine Faure, B. Lebret, P. Ecolan, S. Metayer-Coustard, L. Lefaucheur. Adenosine monophosphate-activated protein kinase status modulates kinetics of post-mortem pH decline and meat quality in pig Longissimus muscle. 57. International Congress of Meat Science and Technology, Aug 2011, Ghent (BE), Belgium. pp.4, 2011. 〈hal-00841076〉

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