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Mitochondrial tissu...
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Ponsot, Elodie,1973-Serv. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France; Hôpital Civil de Strasbourg, Serv. Explorations Fonctionnelles R., 1 place de l'hôpital, Strasbourg Cedex, France
(författare)
Mitochondrial tissue specificity of substrates utilization in rat cardiac and skeletal muscles
- Artikel/kapitelEngelska2005
Förlag, utgivningsår, omfång ...
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2005
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Hoboken, USA :John Wiley & Sons,2005
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:oru-43581
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https://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-43581URI
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https://doi.org/10.1002/jcp.20245DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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As energetic metabolism is crucial for muscles, they develop different adaptations to respond to fluctuating demand among muscle types. Whereas quantitative characteristics are known, no study described simultaneously quantitative and qualitative differences among muscle types in terms of substrates utilization patterns. This study thus defined the pattern of substrates preferential utilization by mitochondria from glycolytic gastrocnemius (GAS) and oxidative soleus (SOL) skeletal muscles and from heart left ventrical (LV) in rats. We measured in situ, ADP (2 mM)-stimulated, mitochondrial respiration rates from skinned fibers in presence of increasing concentrations of pyruvate (Pyr) + malate (Mal), palmitoyl-carnitine (Palm-C) + Mal, glutamate (Glut) + Mal, glycerol-3-phosphate (G3-P), lactate (Lact) + Mal. Because the fibers oxygen uptake (Vs) followed Michaelis-Menten kinetics in function of substrates level we determined the Vs and Km, representing maximal oxidative capacity and the mitochondrial sensibility for each substrate, respectively. Vs were in the order GAS < SOL < LV for Pyr, Glu, and Palm-C substrates, whereas in the order SOL = LV < GAS with G3-P. Moreover, the relative capacity to oxidize Palm-C is extremely higher in LV than in SOL. Vs was not stimulated by the Lact substrate. The Km was equal for Pyr among muscles, but much lower for G3-P in GAS and lower for Palm-C in LV. These results demonstrate qualitative mitochondrial tissue specificity for metabolic pathways. Mitochondria of glycolytic muscle fibers are well adapted to play a central role for maintaining a satisfactory cytosolic redox state in these fibers, whereas mitochondria of LV developed important capacities to use fatty acids.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Zoll, JServ. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France
(författare)
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N'guessan, BServ. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France
(författare)
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Ribera, FServ. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France
(författare)
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Lampert, EServ. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France
(författare)
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Richard, RServ. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France
(författare)
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Veksler, VService de Cardiologie, Hôpitaux Civils de Colmar, Colmar Cedex, France
(författare)
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Ventura-Clapier, RU-446 INSERM, Faculté de Pharmacie, Châtenay-Malabry, France
(författare)
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Mettauer, BServ. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France; Service de Cardiologie, Hôpitaux Civils de Colmar, Colmar Cedex, France
(författare)
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Serv. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France; Hôpital Civil de Strasbourg, Serv. Explorations Fonctionnelles R., 1 place de l'hôpital, Strasbourg Cedex, FranceServ. Explorations Fonctionnelles R., Département de Physiologie, Strasbourg, France
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Cellular PhysiologyHoboken, USA : John Wiley & Sons203:3, s. 479-860021-95411097-4652
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Ponsot, Elodie, ...
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Zoll, J
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N'guessan, B
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Ribera, F
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Lampert, E
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Richard, R
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visa fler...
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Veksler, V
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Ventura-Clapier, ...
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Mettauer, B
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- MEDICIN OCH HÄLSOVETENSKAP
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Örebro universitet