Gene transfer of inducible nitric oxide synthase affords cardioprotection by upregulating heme oxygenase-1 via a nuclear factor-κb-dependent pathway

Qianhong Li, Yiru Guo, Qinghui Ou, Chuanjue Cui, Wen Jian Wu, Wei Tan, Xiaoping Zhu, Lilibeth B. Lanceta, Santosh K. Sanganalmath, Buddhadeb Dawn, Ken Shinmura, Gregg D. Rokosh, Shuyan Wang, Roberto Bolli

Research output: Contribution to journalArticle

Abstract

BACKGROUND-: Although inducible nitric oxide synthase (iNOS) is known to impart powerful protection against myocardial infarction, the mechanism for this salubrious action remains unclear. METHODS AND RESULTS-: Adenovirus-mediated iNOS gene transfer in mice resulted 48 to 72 hours later in increased expression not only of iNOS protein but also of heme oxygenase (HO)-1 mRNA and protein; HO-2 protein expression did not change. iNOS gene transfer markedly reduced infarct size in wild-type mice, but this effect was completely abrogated in HO-1 mice. At 48 hours after iNOS gene transfer, nuclear factor-κB was markedly activated. In transgenic mice with cardiomyocyte-restricted expression of a dominant negative mutant of IκBα (IκBα), both basal HO-1 levels and upregulation of HO-1 by iNOS gene transfer were suppressed. Chromatin immunoprecipitation analysis of mouse hearts provided direct evidence that nuclear factor-κB subunits p50 and p65 were recruited to the HO-1 gene promoter (-468 to-459 bp) 48 hours after iNOS gene transfer. CONCLUSIONS-: This study demonstrates for the first time the existence of a close functional coupling between cardiac iNOS and cardiac HO-1: iNOS upregulates HO-1 by augmenting nuclear factor-κB binding to the region of the HO-1 gene promoter from-468 to-459 bp, and HO-1 then mediates the cardioprotective effects of iNOS. These results also reveal an important role of nuclear factor-κB in both basal and iNOS-induced expression of cardiac HO-1. Collectively, the present findings significantly expand our understanding of the regulation of cardiac HO-1 and of the mechanism whereby iNOS exerts its cardioprotective actions.

Original languageEnglish (US)
Pages (from-to)1222-1230
Number of pages9
JournalCirculation
Volume120
Issue number13
DOIs
StatePublished - Sep 2009
Externally publishedYes

Fingerprint

Heme Oxygenase-1
Nitric Oxide Synthase Type II
Genes
Up-Regulation
Transfer Factor
Proteins
Chromatin Immunoprecipitation
Cardiac Myocytes
Adenoviridae
Transgenic Mice
Myocardial Infarction

Keywords

  • Gene therapy
  • Heme oxygenase-1
  • Myocardial infarction
  • NF-kappaB
  • Nitric oxide synthase

ASJC Scopus subject areas

  • Physiology (medical)
  • Cardiology and Cardiovascular Medicine

Cite this

Gene transfer of inducible nitric oxide synthase affords cardioprotection by upregulating heme oxygenase-1 via a nuclear factor-κb-dependent pathway. / Li, Qianhong; Guo, Yiru; Ou, Qinghui; Cui, Chuanjue; Wu, Wen Jian; Tan, Wei; Zhu, Xiaoping; Lanceta, Lilibeth B.; Sanganalmath, Santosh K.; Dawn, Buddhadeb; Shinmura, Ken; Rokosh, Gregg D.; Wang, Shuyan; Bolli, Roberto.

In: Circulation, Vol. 120, No. 13, 09.2009, p. 1222-1230.

Research output: Contribution to journalArticle

Li, Q, Guo, Y, Ou, Q, Cui, C, Wu, WJ, Tan, W, Zhu, X, Lanceta, LB, Sanganalmath, SK, Dawn, B, Shinmura, K, Rokosh, GD, Wang, S & Bolli, R 2009, 'Gene transfer of inducible nitric oxide synthase affords cardioprotection by upregulating heme oxygenase-1 via a nuclear factor-κb-dependent pathway', Circulation, vol. 120, no. 13, pp. 1222-1230. https://doi.org/10.1161/CIRCULATIONAHA.108.778688
Li, Qianhong ; Guo, Yiru ; Ou, Qinghui ; Cui, Chuanjue ; Wu, Wen Jian ; Tan, Wei ; Zhu, Xiaoping ; Lanceta, Lilibeth B. ; Sanganalmath, Santosh K. ; Dawn, Buddhadeb ; Shinmura, Ken ; Rokosh, Gregg D. ; Wang, Shuyan ; Bolli, Roberto. / Gene transfer of inducible nitric oxide synthase affords cardioprotection by upregulating heme oxygenase-1 via a nuclear factor-κb-dependent pathway. In: Circulation. 2009 ; Vol. 120, No. 13. pp. 1222-1230.
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abstract = "BACKGROUND-: Although inducible nitric oxide synthase (iNOS) is known to impart powerful protection against myocardial infarction, the mechanism for this salubrious action remains unclear. METHODS AND RESULTS-: Adenovirus-mediated iNOS gene transfer in mice resulted 48 to 72 hours later in increased expression not only of iNOS protein but also of heme oxygenase (HO)-1 mRNA and protein; HO-2 protein expression did not change. iNOS gene transfer markedly reduced infarct size in wild-type mice, but this effect was completely abrogated in HO-1 mice. At 48 hours after iNOS gene transfer, nuclear factor-κB was markedly activated. In transgenic mice with cardiomyocyte-restricted expression of a dominant negative mutant of IκBα (IκBα), both basal HO-1 levels and upregulation of HO-1 by iNOS gene transfer were suppressed. Chromatin immunoprecipitation analysis of mouse hearts provided direct evidence that nuclear factor-κB subunits p50 and p65 were recruited to the HO-1 gene promoter (-468 to-459 bp) 48 hours after iNOS gene transfer. CONCLUSIONS-: This study demonstrates for the first time the existence of a close functional coupling between cardiac iNOS and cardiac HO-1: iNOS upregulates HO-1 by augmenting nuclear factor-κB binding to the region of the HO-1 gene promoter from-468 to-459 bp, and HO-1 then mediates the cardioprotective effects of iNOS. These results also reveal an important role of nuclear factor-κB in both basal and iNOS-induced expression of cardiac HO-1. Collectively, the present findings significantly expand our understanding of the regulation of cardiac HO-1 and of the mechanism whereby iNOS exerts its cardioprotective actions.",
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T1 - Gene transfer of inducible nitric oxide synthase affords cardioprotection by upregulating heme oxygenase-1 via a nuclear factor-κb-dependent pathway

AU - Li, Qianhong

AU - Guo, Yiru

AU - Ou, Qinghui

AU - Cui, Chuanjue

AU - Wu, Wen Jian

AU - Tan, Wei

AU - Zhu, Xiaoping

AU - Lanceta, Lilibeth B.

AU - Sanganalmath, Santosh K.

AU - Dawn, Buddhadeb

AU - Shinmura, Ken

AU - Rokosh, Gregg D.

AU - Wang, Shuyan

AU - Bolli, Roberto

PY - 2009/9

Y1 - 2009/9

N2 - BACKGROUND-: Although inducible nitric oxide synthase (iNOS) is known to impart powerful protection against myocardial infarction, the mechanism for this salubrious action remains unclear. METHODS AND RESULTS-: Adenovirus-mediated iNOS gene transfer in mice resulted 48 to 72 hours later in increased expression not only of iNOS protein but also of heme oxygenase (HO)-1 mRNA and protein; HO-2 protein expression did not change. iNOS gene transfer markedly reduced infarct size in wild-type mice, but this effect was completely abrogated in HO-1 mice. At 48 hours after iNOS gene transfer, nuclear factor-κB was markedly activated. In transgenic mice with cardiomyocyte-restricted expression of a dominant negative mutant of IκBα (IκBα), both basal HO-1 levels and upregulation of HO-1 by iNOS gene transfer were suppressed. Chromatin immunoprecipitation analysis of mouse hearts provided direct evidence that nuclear factor-κB subunits p50 and p65 were recruited to the HO-1 gene promoter (-468 to-459 bp) 48 hours after iNOS gene transfer. CONCLUSIONS-: This study demonstrates for the first time the existence of a close functional coupling between cardiac iNOS and cardiac HO-1: iNOS upregulates HO-1 by augmenting nuclear factor-κB binding to the region of the HO-1 gene promoter from-468 to-459 bp, and HO-1 then mediates the cardioprotective effects of iNOS. These results also reveal an important role of nuclear factor-κB in both basal and iNOS-induced expression of cardiac HO-1. Collectively, the present findings significantly expand our understanding of the regulation of cardiac HO-1 and of the mechanism whereby iNOS exerts its cardioprotective actions.

AB - BACKGROUND-: Although inducible nitric oxide synthase (iNOS) is known to impart powerful protection against myocardial infarction, the mechanism for this salubrious action remains unclear. METHODS AND RESULTS-: Adenovirus-mediated iNOS gene transfer in mice resulted 48 to 72 hours later in increased expression not only of iNOS protein but also of heme oxygenase (HO)-1 mRNA and protein; HO-2 protein expression did not change. iNOS gene transfer markedly reduced infarct size in wild-type mice, but this effect was completely abrogated in HO-1 mice. At 48 hours after iNOS gene transfer, nuclear factor-κB was markedly activated. In transgenic mice with cardiomyocyte-restricted expression of a dominant negative mutant of IκBα (IκBα), both basal HO-1 levels and upregulation of HO-1 by iNOS gene transfer were suppressed. Chromatin immunoprecipitation analysis of mouse hearts provided direct evidence that nuclear factor-κB subunits p50 and p65 were recruited to the HO-1 gene promoter (-468 to-459 bp) 48 hours after iNOS gene transfer. CONCLUSIONS-: This study demonstrates for the first time the existence of a close functional coupling between cardiac iNOS and cardiac HO-1: iNOS upregulates HO-1 by augmenting nuclear factor-κB binding to the region of the HO-1 gene promoter from-468 to-459 bp, and HO-1 then mediates the cardioprotective effects of iNOS. These results also reveal an important role of nuclear factor-κB in both basal and iNOS-induced expression of cardiac HO-1. Collectively, the present findings significantly expand our understanding of the regulation of cardiac HO-1 and of the mechanism whereby iNOS exerts its cardioprotective actions.

KW - Gene therapy

KW - Heme oxygenase-1

KW - Myocardial infarction

KW - NF-kappaB

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