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Internal and Emergency Medicine

, Volume 9, Issue 2, pp 179–185 | Cite as

Role of platelets in NOX2 activation mediated by TNFα in heart failure

  • Roberto Cangemi
  • Andrea Celestini
  • Maria Del Ben
  • Pasquale Pignatelli
  • Roberto Carnevale
  • Marco Proietti
  • Cinzia Myriam Calabrese
  • Stefania Basili
  • Francesco VioliEmail author
IM - ORIGINAL

Abstract

Tumor necrosis factor (TNF) α may contribute to the deterioration of cardiovascular function in heart failure (HF) through various mechanisms, including the generation of reactive oxygen species (ROS). NADPH oxidase is the major source of ROS in the vascular system, but the interplay between TNFα and NADPH oxidase activation is elusive. As platelets possess NADPH oxidase enzyme, they represent an important tool to investigate the interplay between NADPH oxidase and TNFα in patients with HF. Serum gp91phox (NOX2), the catalytic core of NADPH oxidase, and serum TNFα were measured in 120 HF patients and in 60 healthy subjects. Compared with healthy subjects, HF patients had higher blood levels of NOX2 and TNFα with a progressive increase from NYHA I to NYHA IV classes. NOX2 levels in blood were independently associated with TNFα in HF patients. An in vitro study, performed on platelets from a subgroup of HF patients, shows that TNFα, at concentrations commonly found in HF patients’ peripheral circulation, activates platelet NOX2. Thus, TNFα increases ROS production and the extracellular levels of NOX2. These phenomena are inhibited by the NOX2-specific blocking peptide gp91ds-tat. The study provides evidence that circulating NOX2, as well as the activation of NOX2 on platelets, is increased in HF likely as a consequence of the underlying inflammatory process.

Keywords

Heart failure NADPH oxidase Oxidative stress TNFα 

Notes

Acknowledgments

This study was supported by a grant from Sapienza University of Rome (Ateneo Federato 2009 to FV).

Conflict of interest

None.

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Copyright information

© SIMI 2012

Authors and Affiliations

  • Roberto Cangemi
    • 1
  • Andrea Celestini
    • 1
  • Maria Del Ben
    • 1
  • Pasquale Pignatelli
    • 1
  • Roberto Carnevale
    • 1
  • Marco Proietti
    • 1
  • Cinzia Myriam Calabrese
    • 1
  • Stefania Basili
    • 1
  • Francesco Violi
    • 1
    Email author
  1. 1.Divisione di I Clinica MedicaSapienza University of RomeRomeItaly

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