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Metabolism of perfused pig intercostal muscles evaluated by 31P-magnetic resonance spectroscopy

This study presents a perfused preparation for evaluation of metabolism in pig intercostal muscle in vitro . Preserved vessels and nerves to an intercostal segment including two adjacent ribs allowed for tissue perfusion and electrical stimulation with measurement of contraction force, oxygen consum...

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Published in:Experimental physiology 2006-07, Vol.91 (4), p.755-763
Main Authors: Pedersen, Brian Lindegaard, Arendrup, Henrik, Secher, Niels H., Quistorff, Bjørn
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Arendrup, Henrik
Secher, Niels H.
Quistorff, Bjørn
description This study presents a perfused preparation for evaluation of metabolism in pig intercostal muscle in vitro . Preserved vessels and nerves to an intercostal segment including two adjacent ribs allowed for tissue perfusion and electrical stimulation with measurement of contraction force, oxygen consumption and 31 P-magnetic resonance spectroscopy ( 31 P-MRS). When perfused at rest with Krebs–Ringer buffer, the preparation maintained physiological levels of phosphocreatine (PCr), inorganic phosphate (P i ), ATP and pH at a stable oxygen consumption of 0.51 ± 0.01 μmol min −1 g −1 for more than 2 h. Tonic stimulation of the nerve caused anaerobic energy consumption as PCr and pH decreased, and both variables recovered after the contraction with half-time values of ∼7 min. Force increased to 0.040 N g −1 (range, 0.031–0.103 N g −1 ) and it gradually decreased by about 70% during the subsequent 5 min of stimulation. The calculated free ADP concentration increased from 7.4 ± 2.1 nmol g −1 at rest to 28 ± 12 nmol g −1 (mean ± s.d. ) by the end of the stimulation. Thus anaerobic ATP turnover was zero at rest, 6.1 ± 2 μmol min −1 g −1 during the first minute of stimulation and 3.5 ± 0.5 μmol min −1 g −1 during the two last minutes, corresponding to the drop in force. When the preparation was left unperfused, anaerobic ATP turnover averaged 0.40 ± 0.15 μmol min −1 g −1 for the first 10 min. The preparation can also be applied to human intercostal muscles, as demonstrated in one preliminary experiment. The results demonstrate a stable and functional in vitro preparation of intact perfused intercostal muscles in the pig.
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Thus anaerobic ATP turnover was zero at rest, 6.1 ± 2 μmol min −1 g −1 during the first minute of stimulation and 3.5 ± 0.5 μmol min −1 g −1 during the two last minutes, corresponding to the drop in force. When the preparation was left unperfused, anaerobic ATP turnover averaged 0.40 ± 0.15 μmol min −1 g −1 for the first 10 min. The preparation can also be applied to human intercostal muscles, as demonstrated in one preliminary experiment. 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Thus anaerobic ATP turnover was zero at rest, 6.1 ± 2 μmol min −1 g −1 during the first minute of stimulation and 3.5 ± 0.5 μmol min −1 g −1 during the two last minutes, corresponding to the drop in force. When the preparation was left unperfused, anaerobic ATP turnover averaged 0.40 ± 0.15 μmol min −1 g −1 for the first 10 min. The preparation can also be applied to human intercostal muscles, as demonstrated in one preliminary experiment. The results demonstrate a stable and functional in vitro preparation of intact perfused intercostal muscles in the pig.</abstract><cop>Oxford, UK</cop><pub>The Physiological Society</pub><pmid>16675500</pmid><doi>10.1113/expphysiol.2006.033274</doi><tpages>9</tpages></addata></record>
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subjects Adenosine Diphosphate - metabolism
Adenosine Triphosphate - metabolism
Animals
Energy Metabolism - physiology
In Vitro Techniques
Intercostal Muscles - metabolism
Magnetic Resonance Spectroscopy - methods
Metabolic Clearance Rate
Models, Animal
Muscle Contraction - physiology
Muscle, Skeletal - blood supply
Muscle, Skeletal - metabolism
Oxygen - metabolism
Oxygen Consumption - physiology
Perfusion - methods
Phosphorus Isotopes
Swine
title Metabolism of perfused pig intercostal muscles evaluated by 31P-magnetic resonance spectroscopy
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