Nox4-derived reactive oxygen species mediate cardiomyocyte injury in early type 1 diabetes

Rita M. Maalouf, Assaad A. Eid, Yves C. Gorin, Karen Block, Gladys Patricia Escobar, Steven Bailey, Hanna E. Abboud

Research output: Contribution to journalArticlepeer-review

80 Scopus citations

Abstract

Oxidative stress contributes to diabetic cardiomyopathy. This study explored the role of the NADPH oxidase Nox4 as a source of reactive oxygen species (ROS) involved in the development of diabetic cardiomyopathy. Phosphorothioated antisense (AS) or sense (S) oligonucleotides for Nox4 were administered for 2 wk to rats made diabetic by streptozotocin. NADPH oxidase activity, ROS generation, and the expression of Nox4, but Nox1 or Nox2, were increased in left ventricular tissue of the diabetic rats. Expression of molecular markers of hypertrophy and myofibrosis including fibronectin, collagen, α-smooth muscle actin, and β-myosin heavy chain were also increased. These parameters were attenuated by the administration of AS but not S Nox4. Moreover, the impairment of contractility observed in diabetic rats was prevented in AS-but not S-treated animals. Exposure of cultured cardiac myocytes to 25 mM glucose [high glucose (HG)] increased NADPH oxidase activity, the expression of Nox4, and molecular markers of cardiac injury. These effects of HG were prevented in cells infected with adenoviral vector containing a dominant negative form of Nox4. This study provides strong evidence that Nox4 is an important source of ROS in the left ventricle and that Nox4-derived ROS contribute to cardiomyopathy at early stages of type 1 diabetes.

Original languageEnglish (US)
Pages (from-to)C597-C604
JournalAmerican Journal of Physiology - Cell Physiology
Volume302
Issue number3
DOIs
StatePublished - Feb 2012

Keywords

  • Cardiac injury
  • NADPH oxidases
  • Oxidative stress

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

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