Overexpression of ornithine decarboxylase decreases ventricular systolic function during induction of cardiac hypertrophy

Emanuele Giordano, Rebecca A. Hillary, Thomas C. Vary, Anthony E. Pegg, Andrew D. Sumner, Claudio M. Caldarera, Xue Qian Zhang, Jianliang Song, Jufang Wang, Joseph Y. Cheung, Lisa M. Shantz

Research output: Contribution to journalArticle

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Abstract

Ornithine decarboxylase (ODC), the first enzyme of polyamine metabolism, is rapidly upregulated in response to agents that induce a pathological cardiac hypertrophy. Transgenic mice overexpressing ODC in the heart (MHC-ODC mice) experience a much more dramatic left ventricular hypertrophy in response to β-adrenergic stimulation with isoproterenol (ISO) compared to wild-type (WT) controls. ISO also induced arginase activity in transgenic hearts but not in controls. The current work studies the cooperation between the cardiac polyamines and L-arginine (L-Arg) availability in MHC-ODC mice. Although ISO-induced hypertrophy is well-compensated, MHC-ODC mice administered L-Arg along with ISO showed a rapid onset of systolic dysfunction and died within 48 h. Myocytes isolated from MHC-ODC mice administered L-Arg/ISO exhibited reduced contractility and altered calcium transients, suggesting an alteration in [Ca 2+] homeostasis, and abbreviated action potential duration, which may contribute to arrhythmogenesis. The already elevated levels of spermidine and spermine were not further altered in MHC-ODC hearts by L-Arg/ISO treatment, suggesting alternative L-Arg utilization pathways lead to dysregulation of intracellular calcium. MHCODC mice administered an arginase inhibitor (Nor-NOHA) along with ISO died almost as rapidly as L-Arg/ISO-treated mice, while the iNOS inhibitor S-methyl-isothiourea (SMT) was strongly protective against L-Arg/ISO. These results point to the induction of arginase as a protective response to β-adrenergic stimulation in the setting of high polyamines. Further, NO generated by exogenously supplied L-Arg may contribute to the lethal consequences of L-Arg/ISO treatment. Since considerable variations in human cardiac polyamine and L-Arg content are likely, it is possible that alterations in these factors may influence myocyte contractility.

Original languageEnglish (US)
Pages (from-to)507-518
Number of pages12
JournalAmino Acids
Volume42
Issue number2-3
DOIs
StatePublished - Feb 1 2012

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Ornithine Decarboxylase
Ventricular Function
Cardiomegaly
Isoproterenol
Polyamines
Arginase
Adrenergic Agents
Muscle Cells
Calcium
Spermidine
Spermine
Left Ventricular Hypertrophy
Metabolism
Hypertrophy
Transgenic Mice
Action Potentials
Arginine
Homeostasis
Availability

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Clinical Biochemistry
  • Organic Chemistry

Cite this

Giordano, Emanuele ; Hillary, Rebecca A. ; Vary, Thomas C. ; Pegg, Anthony E. ; Sumner, Andrew D. ; Caldarera, Claudio M. ; Zhang, Xue Qian ; Song, Jianliang ; Wang, Jufang ; Cheung, Joseph Y. ; Shantz, Lisa M. / Overexpression of ornithine decarboxylase decreases ventricular systolic function during induction of cardiac hypertrophy. In: Amino Acids. 2012 ; Vol. 42, No. 2-3. pp. 507-518.
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abstract = "Ornithine decarboxylase (ODC), the first enzyme of polyamine metabolism, is rapidly upregulated in response to agents that induce a pathological cardiac hypertrophy. Transgenic mice overexpressing ODC in the heart (MHC-ODC mice) experience a much more dramatic left ventricular hypertrophy in response to β-adrenergic stimulation with isoproterenol (ISO) compared to wild-type (WT) controls. ISO also induced arginase activity in transgenic hearts but not in controls. The current work studies the cooperation between the cardiac polyamines and L-arginine (L-Arg) availability in MHC-ODC mice. Although ISO-induced hypertrophy is well-compensated, MHC-ODC mice administered L-Arg along with ISO showed a rapid onset of systolic dysfunction and died within 48 h. Myocytes isolated from MHC-ODC mice administered L-Arg/ISO exhibited reduced contractility and altered calcium transients, suggesting an alteration in [Ca 2+] homeostasis, and abbreviated action potential duration, which may contribute to arrhythmogenesis. The already elevated levels of spermidine and spermine were not further altered in MHC-ODC hearts by L-Arg/ISO treatment, suggesting alternative L-Arg utilization pathways lead to dysregulation of intracellular calcium. MHCODC mice administered an arginase inhibitor (Nor-NOHA) along with ISO died almost as rapidly as L-Arg/ISO-treated mice, while the iNOS inhibitor S-methyl-isothiourea (SMT) was strongly protective against L-Arg/ISO. These results point to the induction of arginase as a protective response to β-adrenergic stimulation in the setting of high polyamines. Further, NO generated by exogenously supplied L-Arg may contribute to the lethal consequences of L-Arg/ISO treatment. Since considerable variations in human cardiac polyamine and L-Arg content are likely, it is possible that alterations in these factors may influence myocyte contractility.",
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Giordano, E, Hillary, RA, Vary, TC, Pegg, AE, Sumner, AD, Caldarera, CM, Zhang, XQ, Song, J, Wang, J, Cheung, JY & Shantz, LM 2012, 'Overexpression of ornithine decarboxylase decreases ventricular systolic function during induction of cardiac hypertrophy', Amino Acids, vol. 42, no. 2-3, pp. 507-518. https://doi.org/10.1007/s00726-011-1023-y

Overexpression of ornithine decarboxylase decreases ventricular systolic function during induction of cardiac hypertrophy. / Giordano, Emanuele; Hillary, Rebecca A.; Vary, Thomas C.; Pegg, Anthony E.; Sumner, Andrew D.; Caldarera, Claudio M.; Zhang, Xue Qian; Song, Jianliang; Wang, Jufang; Cheung, Joseph Y.; Shantz, Lisa M.

In: Amino Acids, Vol. 42, No. 2-3, 01.02.2012, p. 507-518.

Research output: Contribution to journalArticle

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T1 - Overexpression of ornithine decarboxylase decreases ventricular systolic function during induction of cardiac hypertrophy

AU - Giordano, Emanuele

AU - Hillary, Rebecca A.

AU - Vary, Thomas C.

AU - Pegg, Anthony E.

AU - Sumner, Andrew D.

AU - Caldarera, Claudio M.

AU - Zhang, Xue Qian

AU - Song, Jianliang

AU - Wang, Jufang

AU - Cheung, Joseph Y.

AU - Shantz, Lisa M.

PY - 2012/2/1

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N2 - Ornithine decarboxylase (ODC), the first enzyme of polyamine metabolism, is rapidly upregulated in response to agents that induce a pathological cardiac hypertrophy. Transgenic mice overexpressing ODC in the heart (MHC-ODC mice) experience a much more dramatic left ventricular hypertrophy in response to β-adrenergic stimulation with isoproterenol (ISO) compared to wild-type (WT) controls. ISO also induced arginase activity in transgenic hearts but not in controls. The current work studies the cooperation between the cardiac polyamines and L-arginine (L-Arg) availability in MHC-ODC mice. Although ISO-induced hypertrophy is well-compensated, MHC-ODC mice administered L-Arg along with ISO showed a rapid onset of systolic dysfunction and died within 48 h. Myocytes isolated from MHC-ODC mice administered L-Arg/ISO exhibited reduced contractility and altered calcium transients, suggesting an alteration in [Ca 2+] homeostasis, and abbreviated action potential duration, which may contribute to arrhythmogenesis. The already elevated levels of spermidine and spermine were not further altered in MHC-ODC hearts by L-Arg/ISO treatment, suggesting alternative L-Arg utilization pathways lead to dysregulation of intracellular calcium. MHCODC mice administered an arginase inhibitor (Nor-NOHA) along with ISO died almost as rapidly as L-Arg/ISO-treated mice, while the iNOS inhibitor S-methyl-isothiourea (SMT) was strongly protective against L-Arg/ISO. These results point to the induction of arginase as a protective response to β-adrenergic stimulation in the setting of high polyamines. Further, NO generated by exogenously supplied L-Arg may contribute to the lethal consequences of L-Arg/ISO treatment. Since considerable variations in human cardiac polyamine and L-Arg content are likely, it is possible that alterations in these factors may influence myocyte contractility.

AB - Ornithine decarboxylase (ODC), the first enzyme of polyamine metabolism, is rapidly upregulated in response to agents that induce a pathological cardiac hypertrophy. Transgenic mice overexpressing ODC in the heart (MHC-ODC mice) experience a much more dramatic left ventricular hypertrophy in response to β-adrenergic stimulation with isoproterenol (ISO) compared to wild-type (WT) controls. ISO also induced arginase activity in transgenic hearts but not in controls. The current work studies the cooperation between the cardiac polyamines and L-arginine (L-Arg) availability in MHC-ODC mice. Although ISO-induced hypertrophy is well-compensated, MHC-ODC mice administered L-Arg along with ISO showed a rapid onset of systolic dysfunction and died within 48 h. Myocytes isolated from MHC-ODC mice administered L-Arg/ISO exhibited reduced contractility and altered calcium transients, suggesting an alteration in [Ca 2+] homeostasis, and abbreviated action potential duration, which may contribute to arrhythmogenesis. The already elevated levels of spermidine and spermine were not further altered in MHC-ODC hearts by L-Arg/ISO treatment, suggesting alternative L-Arg utilization pathways lead to dysregulation of intracellular calcium. MHCODC mice administered an arginase inhibitor (Nor-NOHA) along with ISO died almost as rapidly as L-Arg/ISO-treated mice, while the iNOS inhibitor S-methyl-isothiourea (SMT) was strongly protective against L-Arg/ISO. These results point to the induction of arginase as a protective response to β-adrenergic stimulation in the setting of high polyamines. Further, NO generated by exogenously supplied L-Arg may contribute to the lethal consequences of L-Arg/ISO treatment. Since considerable variations in human cardiac polyamine and L-Arg content are likely, it is possible that alterations in these factors may influence myocyte contractility.

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