Impaired regulation of neuronal nitric oxide synthase and heart rate during exercise in mice lacking one nNOS allele

We tested the hypothesis that a single allele deletion of neuronal nitric oxide synthase (nNOS) would impair the neural control of heart rate following physical training, and that this phenotype could be restored following targeted gene transfer of nNOS. Voluntary wheel-running (+EX) in heterozygous...

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Veröffentlicht in:The Journal of physiology 2004-08, Vol.558 (3), p.963-974
Hauptverfasser: Danson, E. J. F., Mankia, K. S., Golding, S., Dawson, T., Everatt, L., Cai, S., Channon, K. M., Paterson, D. J.
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container_issue 3
container_start_page 963
container_title The Journal of physiology
container_volume 558
creator Danson, E. J. F.
Mankia, K. S.
Golding, S.
Dawson, T.
Everatt, L.
Cai, S.
Channon, K. M.
Paterson, D. J.
description We tested the hypothesis that a single allele deletion of neuronal nitric oxide synthase (nNOS) would impair the neural control of heart rate following physical training, and that this phenotype could be restored following targeted gene transfer of nNOS. Voluntary wheel-running (+EX) in heterozygous nNOS knockout mice ( nNOS +/− , +EX; n = 52; peak performance 9.1 ± 1.8 km day −1 ) was undertaken and compared to wild-type mice ( n = 38; 9.5 ± 0.8 km day −1 ). In anaesthetized wild-type mice, exercise increased phenylephrine-induced bradycardia by 67% (measured as heart rate change, in beats per minute, divided by the change in arterial blood pressure, in mmHg) or pulse interval response to phenylephrine by 52% (measured as interbeat interval change, in milliseconds, divided by the change in blood pressure). Heart rate changes or interbeat interval changes in response to right vagal nerve stimulation were also enhanced by exercise in wild-type atria ( P < 0.05), whereas both in vivo and in vitro responses to exercise were absent in nNOS +/− mice. nNOS inhibition attenuated heart rate responses to vagal nerve stimulation in all atria ( P < 0.05) and normalized the responses in wild-type, +EX with respect to wild-type with no exercise (−EX) atria. Atrial nNOS mRNA and protein were increased in wild-type, +EX compared to wild-type, −EX ( P < 0.05), although exercise failed to have any effect in nNOS +/− atria. In vivo nNOS gene transfer using adenoviruses targeted to atrial ganglia enhanced choline acetyltransferase–nNOS co-localization ( P < 0.05) and increased phenylephrine-induced bradycardia in vivo and heart rate responses to vagal nerve stimulation in vitro compared to gene transfer of enhanced green fluorescent protein (eGFP, P < 0.01). This difference was abolished by nNOS inhibition ( P < 0.05). In conclusion, genomic regulation of NO bioavailability from nNOS in cardiac autonomic ganglia in response to training is dependent on both alleles of the gene. Although basal expression of nNOS is normal, polymorphisms of nNOS may interfere with neural regulation of heart rate following training. Targeted gene transfer of nNOS can restore this impairment.
doi_str_mv 10.1113/jphysiol.2004.062299
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In anaesthetized wild-type mice, exercise increased phenylephrine-induced bradycardia by 67% (measured as heart rate change, in beats per minute, divided by the change in arterial blood pressure, in mmHg) or pulse interval response to phenylephrine by 52% (measured as interbeat interval change, in milliseconds, divided by the change in blood pressure). Heart rate changes or interbeat interval changes in response to right vagal nerve stimulation were also enhanced by exercise in wild-type atria ( P < 0.05), whereas both in vivo and in vitro responses to exercise were absent in nNOS +/− mice. nNOS inhibition attenuated heart rate responses to vagal nerve stimulation in all atria ( P < 0.05) and normalized the responses in wild-type, +EX with respect to wild-type with no exercise (−EX) atria. Atrial nNOS mRNA and protein were increased in wild-type, +EX compared to wild-type, −EX ( P < 0.05), although exercise failed to have any effect in nNOS +/− atria. In vivo nNOS gene transfer using adenoviruses targeted to atrial ganglia enhanced choline acetyltransferase–nNOS co-localization ( P < 0.05) and increased phenylephrine-induced bradycardia in vivo and heart rate responses to vagal nerve stimulation in vitro compared to gene transfer of enhanced green fluorescent protein (eGFP, P < 0.01). This difference was abolished by nNOS inhibition ( P < 0.05). In conclusion, genomic regulation of NO bioavailability from nNOS in cardiac autonomic ganglia in response to training is dependent on both alleles of the gene. Although basal expression of nNOS is normal, polymorphisms of nNOS may interfere with neural regulation of heart rate following training. 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J. F.</creatorcontrib><creatorcontrib>Mankia, K. S.</creatorcontrib><creatorcontrib>Golding, S.</creatorcontrib><creatorcontrib>Dawson, T.</creatorcontrib><creatorcontrib>Everatt, L.</creatorcontrib><creatorcontrib>Cai, S.</creatorcontrib><creatorcontrib>Channon, K. M.</creatorcontrib><creatorcontrib>Paterson, D. J.</creatorcontrib><title>Impaired regulation of neuronal nitric oxide synthase and heart rate during exercise in mice lacking one nNOS allele</title><title>The Journal of physiology</title><addtitle>J Physiol</addtitle><description><![CDATA[We tested the hypothesis that a single allele deletion of neuronal nitric oxide synthase (nNOS) would impair the neural control of heart rate following physical training, and that this phenotype could be restored following targeted gene transfer of nNOS. Voluntary wheel-running (+EX) in heterozygous nNOS knockout mice ( nNOS +/− , +EX; n = 52; peak performance 9.1 ± 1.8 km day −1 ) was undertaken and compared to wild-type mice ( n = 38; 9.5 ± 0.8 km day −1 ). In anaesthetized wild-type mice, exercise increased phenylephrine-induced bradycardia by 67% (measured as heart rate change, in beats per minute, divided by the change in arterial blood pressure, in mmHg) or pulse interval response to phenylephrine by 52% (measured as interbeat interval change, in milliseconds, divided by the change in blood pressure). Heart rate changes or interbeat interval changes in response to right vagal nerve stimulation were also enhanced by exercise in wild-type atria ( P < 0.05), whereas both in vivo and in vitro responses to exercise were absent in nNOS +/− mice. nNOS inhibition attenuated heart rate responses to vagal nerve stimulation in all atria ( P < 0.05) and normalized the responses in wild-type, +EX with respect to wild-type with no exercise (−EX) atria. Atrial nNOS mRNA and protein were increased in wild-type, +EX compared to wild-type, −EX ( P < 0.05), although exercise failed to have any effect in nNOS +/− atria. In vivo nNOS gene transfer using adenoviruses targeted to atrial ganglia enhanced choline acetyltransferase–nNOS co-localization ( P < 0.05) and increased phenylephrine-induced bradycardia in vivo and heart rate responses to vagal nerve stimulation in vitro compared to gene transfer of enhanced green fluorescent protein (eGFP, P < 0.01). This difference was abolished by nNOS inhibition ( P < 0.05). In conclusion, genomic regulation of NO bioavailability from nNOS in cardiac autonomic ganglia in response to training is dependent on both alleles of the gene. Although basal expression of nNOS is normal, polymorphisms of nNOS may interfere with neural regulation of heart rate following training. 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J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Impaired regulation of neuronal nitric oxide synthase and heart rate during exercise in mice lacking one nNOS allele</atitle><jtitle>The Journal of physiology</jtitle><addtitle>J Physiol</addtitle><date>2004-08</date><risdate>2004</risdate><volume>558</volume><issue>3</issue><spage>963</spage><epage>974</epage><pages>963-974</pages><issn>0022-3751</issn><eissn>1469-7793</eissn><abstract><![CDATA[We tested the hypothesis that a single allele deletion of neuronal nitric oxide synthase (nNOS) would impair the neural control of heart rate following physical training, and that this phenotype could be restored following targeted gene transfer of nNOS. Voluntary wheel-running (+EX) in heterozygous nNOS knockout mice ( nNOS +/− , +EX; n = 52; peak performance 9.1 ± 1.8 km day −1 ) was undertaken and compared to wild-type mice ( n = 38; 9.5 ± 0.8 km day −1 ). In anaesthetized wild-type mice, exercise increased phenylephrine-induced bradycardia by 67% (measured as heart rate change, in beats per minute, divided by the change in arterial blood pressure, in mmHg) or pulse interval response to phenylephrine by 52% (measured as interbeat interval change, in milliseconds, divided by the change in blood pressure). Heart rate changes or interbeat interval changes in response to right vagal nerve stimulation were also enhanced by exercise in wild-type atria ( P < 0.05), whereas both in vivo and in vitro responses to exercise were absent in nNOS +/− mice. nNOS inhibition attenuated heart rate responses to vagal nerve stimulation in all atria ( P < 0.05) and normalized the responses in wild-type, +EX with respect to wild-type with no exercise (−EX) atria. Atrial nNOS mRNA and protein were increased in wild-type, +EX compared to wild-type, −EX ( P < 0.05), although exercise failed to have any effect in nNOS +/− atria. In vivo nNOS gene transfer using adenoviruses targeted to atrial ganglia enhanced choline acetyltransferase–nNOS co-localization ( P < 0.05) and increased phenylephrine-induced bradycardia in vivo and heart rate responses to vagal nerve stimulation in vitro compared to gene transfer of enhanced green fluorescent protein (eGFP, P < 0.01). This difference was abolished by nNOS inhibition ( P < 0.05). In conclusion, genomic regulation of NO bioavailability from nNOS in cardiac autonomic ganglia in response to training is dependent on both alleles of the gene. Although basal expression of nNOS is normal, polymorphisms of nNOS may interfere with neural regulation of heart rate following training. Targeted gene transfer of nNOS can restore this impairment.]]></abstract><cop>9600 Garsington Road , Oxford , OX4 2DQ , UK</cop><pub>The Physiological Society</pub><pmid>15155789</pmid><doi>10.1113/jphysiol.2004.062299</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record>
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subjects Alleles
Animals
Heart Rate - genetics
Heart Rate - physiology
Mice
Mice, Inbred C57BL
Mice, Knockout
Nitric Oxide Synthase - deficiency
Nitric Oxide Synthase - genetics
Nitric Oxide Synthase - physiology
Nitric Oxide Synthase Type I
Physical Conditioning, Animal - physiology
Research Papers
title Impaired regulation of neuronal nitric oxide synthase and heart rate during exercise in mice lacking one nNOS allele
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