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Characterization of Mitochondrial Content and Respiratory Capacities of Broiler Chicken Skeletal Muscles with Different Muscle Fiber Compositions

Mitochondrial content is regarded a useful feature to distinguish muscle-fiber types in terms of energy metabolism in skeletal muscles. Increasing evidence suggests that specific mitochondrial bioenergetic phenotypes exist in metabolically different muscle fibers. A few studies have examined the ene... Full description

Journal Title: The Journal of Poultry Science 2018, Vol.advpub(0)
Main Author: Hakamata, Yuki
Other Authors: Watanabe, Kouichi , Amo, Taku , Toyomizu, Masaaki , Kikusato, Motoi
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 1346-7395 ; DOI: 10.2141/jpsa.0170141
Link: https://jlc.jst.go.jp/DN/JLC/92000191888?from=PrimoCentral
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recordid: jstageDN/JLC/92000191888
title: Characterization of Mitochondrial Content and Respiratory Capacities of Broiler Chicken Skeletal Muscles with Different Muscle Fiber Compositions
format: Article
creator:
  • Hakamata, Yuki
  • Watanabe, Kouichi
  • Amo, Taku
  • Toyomizu, Masaaki
  • Kikusato, Motoi
subjects:
  • Carnitine Palmitoyltransferase System
  • Citrate Synthase
  • Mitochondrial Content
ispartof: The Journal of Poultry Science, 2018, Vol.advpub(0)
description: Mitochondrial content is regarded a useful feature to distinguish muscle-fiber types in terms of energy metabolism in skeletal muscles. Increasing evidence suggests that specific mitochondrial bioenergetic phenotypes exist in metabolically different muscle fibers. A few studies have examined the energetic properties of skeletal muscle in domestic fowls; however, no information on muscle bioenergetics in broiler chickens selectively bred for faster growth is available. In this study, we aimed to characterize the mitochondrial contents and functions of chicken skeletal muscle consisting entirely of type I (oxidative) (M. pubo-ischio-femoralis pars medialis), type IIA (glycolytic/oxidative) (M. pubo-ischio-femoralis pars lateralis), and type IIB (glycolytic) (M. pectoralis superficialis) muscle fibers. Citrate synthase (CS) activity was the highest in type IIA muscle tissues and isolated mitochondria, among the muscle tissues tested. Although no difference was registered in mitochondrial CS activity between type IIB and type I muscles, tissue CS activity was significantly higher in the latter. Histochemical staining for NADH tetrazolium reductase and the ratio of muscle-tissue to mitochondrial CS activity indicated that type I, type IIA, and type IIB muscle-fiber types showed decreasing mitochondrial content. Mitochondria from type I muscle exhibited a higher coupled respiration rate induced by pyruvate/malate, palmitoyl-CoA/malate, and palmitoyl-carnitine, as respiratory substrates, than type IIB-muscle mitochondria, while the response of mitochondria from type IIA muscle to those substrates was comparable to that of mitochondria from type I muscle. Type IIA-muscle mitochondria exhibited the highest carnitine palmitoyltransferase-2 level among all tissues tested, which may contribute to the higher fatty acid oxidation in these mitochondria. The results suggest that mitochondrial abundance is one of the features differentiating metabolic characteristics of different chicken skeletal muscle types. Moreover, the study demonstrated that type IIA-muscle mitochondria may have distinct metabolic capacities.
language: eng
source:
identifier: ISSN: 1346-7395 ; DOI: 10.2141/jpsa.0170141
fulltext: fulltext
issn:
  • 1346-7395
  • 13467395
url: Link


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identifierISSN: 1346-7395 ; DOI: 10.2141/jpsa.0170141
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titleCharacterization of Mitochondrial Content and Respiratory Capacities of Broiler Chicken Skeletal Muscles with Different Muscle Fiber Compositions
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