Insulin and contraction increase nutritive blood flow in rat muscle in vivo determined by microdialysis of l-[14C]glucose
Identifieur interne : 002727 ( Pmc/Curation ); précédent : 002726; suivant : 002728Insulin and contraction increase nutritive blood flow in rat muscle in vivo determined by microdialysis of l-[14C]glucose
Auteurs : John M B. Newman ; Renee M. Ross ; Stephen M. Richards ; Michael G. Clark ; Stephen RattiganSource :
- The Journal of Physiology [ 0022-3751 ] ; 2007.
Abstract
In the present study, a mathematical model using the microdialysis outflow: inflow (O/I) ratio of the novel analogue
Url:
DOI: 10.1113/jphysiol.2007.138818
PubMed: 17884927
PubMed Central: 2375457
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Insulin and contraction increase nutritive blood flow in rat muscle <italic>in vivo</italic> determined by microdialysis of l-[<sup>14</sup>C]glucose</title><author><name sortKey="Newman, John M B" sort="Newman, John M B" uniqKey="Newman J" first="John M B" last="Newman">John M B. Newman</name></author><author><name sortKey="Ross, Renee M" sort="Ross, Renee M" uniqKey="Ross R" first="Renee M" last="Ross">Renee M. Ross</name></author><author><name sortKey="Richards, Stephen M" sort="Richards, Stephen M" uniqKey="Richards S" first="Stephen M" last="Richards">Stephen M. Richards</name></author><author><name sortKey="Clark, Michael G" sort="Clark, Michael G" uniqKey="Clark M" first="Michael G" last="Clark">Michael G. Clark</name></author><author><name sortKey="Rattigan, Stephen" sort="Rattigan, Stephen" uniqKey="Rattigan S" first="Stephen" last="Rattigan">Stephen Rattigan</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">17884927</idno><idno type="pmc">2375457</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2375457</idno><idno type="RBID">PMC:2375457</idno><idno type="doi">10.1113/jphysiol.2007.138818</idno><date when="2007">2007</date><idno type="wicri:Area/Pmc/Corpus">002728</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">002728</idno><idno type="wicri:Area/Pmc/Curation">002727</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">002727</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Insulin and contraction increase nutritive blood flow in rat muscle <italic>in vivo</italic> determined by microdialysis of l-[<sup>14</sup>C]glucose</title><author><name sortKey="Newman, John M B" sort="Newman, John M B" uniqKey="Newman J" first="John M B" last="Newman">John M B. Newman</name></author><author><name sortKey="Ross, Renee M" sort="Ross, Renee M" uniqKey="Ross R" first="Renee M" last="Ross">Renee M. Ross</name></author><author><name sortKey="Richards, Stephen M" sort="Richards, Stephen M" uniqKey="Richards S" first="Stephen M" last="Richards">Stephen M. Richards</name></author><author><name sortKey="Clark, Michael G" sort="Clark, Michael G" uniqKey="Clark M" first="Michael G" last="Clark">Michael G. Clark</name></author><author><name sortKey="Rattigan, Stephen" sort="Rattigan, Stephen" uniqKey="Rattigan S" first="Stephen" last="Rattigan">Stephen Rattigan</name></author></analytic><series><title level="j">The Journal of Physiology</title><idno type="ISSN">0022-3751</idno><idno type="eISSN">1469-7793</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>In the present study, a mathematical model using the microdialysis outflow: inflow (O/I) ratio of the novel analogue <sc>l</sc>-[<sup>14</sup>C]glucose has been developed which allows the calculation of the nutritive (and non-nutritive) flow in muscle as a proportion of total blood flow. Anaesthetized rats had microdialysis probes carrying <sc>l</sc>-[<sup>14</sup>C]glucose inserted through a calf muscle group (tibialis/plantaris/gastrocnemius). The nutritive fraction of total blood flow was determined under basal conditions and in response to contraction (electrical field stimulation), insulin (hyperinsulinaemic euglycaemic clamp with 10 mU min<sup>−1</sup> kg<sup>−1</sup> insulin) or saline control from limb blood flow and the microdialysis O/I ratio of <sc>l</sc>-[<sup>14</sup>C]glucose. Both contraction and insulin infusion decreased the O/I ratio of <sc>l</sc>-[<sup>14</sup>C]glucose and increased total limb blood flow. Calculations based on mathematical models using <sc>l</sc>-[<sup>14</sup>C]glucose O/I and limb blood flow revealed that during basal conditions, the nutritive fraction of total flow was 0.38 ± 0.06, indicating that basal flow was predominantly non-nutritive. Contraction and insulin increased the nutritive fraction to 0.82 ± 0.24 (<italic>P</italic> < 0.05) and 0.52 ± 0.12 (<italic>P</italic> < 0.05). Thus the increase in limb blood flow from insulin was fully accommodated by nutritive flow, while contraction increased nutritive flow at the expense of non-nutritive flow. This novel method using microdialysis and the O/I ratio of <sc>l</sc>-[<sup>14</sup>C]glucose allows the determination of the nutritive fraction of total flow in muscle as well as the proportion of total flow that may be redistributed in response to contraction and insulin.</p></div></front></TEI><pmc article-type="research-article" xml:lang="EN"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">J Physiol</journal-id><journal-id journal-id-type="publisher-id">tjp</journal-id><journal-title>The Journal of Physiology</journal-title><issn pub-type="ppub">0022-3751</issn><issn pub-type="epub">1469-7793</issn><publisher><publisher-name>Blackwell Publishing Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">17884927</article-id><article-id pub-id-type="pmc">2375457</article-id><article-id pub-id-type="doi">10.1113/jphysiol.2007.138818</article-id><article-categories><subj-group subj-group-type="heading"><subject>Skeletal Muscle and Exercise</subject></subj-group></article-categories><title-group><article-title>Insulin and contraction increase nutritive blood flow in rat muscle <italic>in vivo</italic> determined by microdialysis of l-[<sup>14</sup>C]glucose</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Newman</surname><given-names>John M B</given-names></name></contrib><contrib contrib-type="author"><name><surname>Ross</surname><given-names>Renee M</given-names></name></contrib><contrib contrib-type="author"><name><surname>Richards</surname><given-names>Stephen M</given-names></name></contrib><contrib contrib-type="author"><name><surname>Clark</surname><given-names>Michael G</given-names></name></contrib><contrib contrib-type="author"><name><surname>Rattigan</surname><given-names>Stephen</given-names></name></contrib><aff><institution>Biochemistry, Medical School, University of Tasmania</institution><addr-line>Private Bag 58, Hobart 7001, Tasmania, Australia</addr-line></aff></contrib-group><author-notes><corresp id="cor1"><bold>Corresponding author</bold> J. M. B. Newman: Biochemistry, Medical School, University of Tasmania, Private Bag 58, Hobart 7001, Tasmania, Australia. Email: <email>j.newman@utas.edu.au</email></corresp></author-notes><pub-date pub-type="ppub"><day>15</day><month>11</month><year>2007</year></pub-date><pub-date pub-type="epub"><day>20</day><month>9</month><year>2007</year></pub-date><volume>585</volume><issue>Pt 1</issue><fpage>217</fpage><lpage>229</lpage><history><date date-type="received"><day>17</day><month>6</month><year>2007</year></date><date date-type="accepted"><day>17</day><month>9</month><year>2007</year></date></history><copyright-statement>© 2007 The Authors. Journal compilation © 2007 The Physiological Society</copyright-statement><copyright-year>2007</copyright-year><abstract><p>In the present study, a mathematical model using the microdialysis outflow: inflow (O/I) ratio of the novel analogue <sc>l</sc>-[<sup>14</sup>C]glucose has been developed which allows the calculation of the nutritive (and non-nutritive) flow in muscle as a proportion of total blood flow. Anaesthetized rats had microdialysis probes carrying <sc>l</sc>-[<sup>14</sup>C]glucose inserted through a calf muscle group (tibialis/plantaris/gastrocnemius). The nutritive fraction of total blood flow was determined under basal conditions and in response to contraction (electrical field stimulation), insulin (hyperinsulinaemic euglycaemic clamp with 10 mU min<sup>−1</sup> kg<sup>−1</sup> insulin) or saline control from limb blood flow and the microdialysis O/I ratio of <sc>l</sc>-[<sup>14</sup>C]glucose. Both contraction and insulin infusion decreased the O/I ratio of <sc>l</sc>-[<sup>14</sup>C]glucose and increased total limb blood flow. Calculations based on mathematical models using <sc>l</sc>-[<sup>14</sup>C]glucose O/I and limb blood flow revealed that during basal conditions, the nutritive fraction of total flow was 0.38 ± 0.06, indicating that basal flow was predominantly non-nutritive. Contraction and insulin increased the nutritive fraction to 0.82 ± 0.24 (<italic>P</italic> < 0.05) and 0.52 ± 0.12 (<italic>P</italic> < 0.05). Thus the increase in limb blood flow from insulin was fully accommodated by nutritive flow, while contraction increased nutritive flow at the expense of non-nutritive flow. This novel method using microdialysis and the O/I ratio of <sc>l</sc>-[<sup>14</sup>C]glucose allows the determination of the nutritive fraction of total flow in muscle as well as the proportion of total flow that may be redistributed in response to contraction and insulin.</p></abstract></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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