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Increased inducible nitric oxide synthase (iNOS) expression in human myocardial infarction

  • Verena WilmesEmail author
  • Stefanie Scheiper
  • Winta Roehr
  • Constanze Niess
  • Stefan Kippenberger
  • Katja Steinhorst
  • Marcel A. Verhoff
  • Silke Kauferstein
Original Article

Abstract

Increased inducible nitric oxide synthase (iNOS) expression has been reported in heart failure, cardiomyopathies, and arteriosclerosis. iNOS is expressed in the heart upon inflammatory stimuli and produces excessive amounts of nitric oxide (NO). The overproduction of NO is cytotoxic and involved in cardiovascular diseases. Furthermore, iNOS produces superoxide anion which proceeds with NO to the harmful oxidant peroxynitrite, causing oxidative stress in the heart. The aim of the study was to gain new insights into the role of iNOS in human myocardial infarction (MI) and its contribution to oxidative stress in the heart. Furthermore, we investigated the unaffected myocardium of the infarction hearts, to study if iNOS expression is increased, probably as an indicator for oxidative stress. Our results show a significant increase (p = 0.013) of the iNOS expression in the affected regions of MI hearts (n = 9) in comparison with healthy control hearts (n = 4). In the unaffected regions of MI hearts, an increase in the iNOS expression in some samples was found as well. Our study demonstrated the direct detection of iNOS mRNA in human myocardial tissue. The balance between beneficial and deleterious effects of iNOS may be particularly influenced by the presence or absence of concurrent oxidative stress.

Keywords

Myocardial infarction (MI) Oxidative stress Inducible nitric oxide synthase (iNOS) Reactive oxygen species (ROS) 

Notes

Acknowledgments

We thank Christine Elbert for her technical assistance and the Foundation Forensisches Forum.

Funding

Foundation Forensisches Forum

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Verena Wilmes
    • 1
    Email author
  • Stefanie Scheiper
    • 1
  • Winta Roehr
    • 1
  • Constanze Niess
    • 1
  • Stefan Kippenberger
    • 2
  • Katja Steinhorst
    • 2
  • Marcel A. Verhoff
    • 1
  • Silke Kauferstein
    • 1
  1. 1.Institute of Legal Medicine, University Hospital of FrankfurtGoethe University Frankfurt/MainFrankfurt am MainGermany
  2. 2.Department of Dermatology, University Hospital of FrankfurtGoethe University Frankfurt/MainFrankfurtGermany

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