, Volume 26, Issue 5, pp 215–222 | Cite as

Dexamethasone Inhibits Apoptosis of Human Neutrophils Induced by Reactive Oxygen Species

  • Lina M. Ruiz
  • Gabriel Bedoya
  • James Salazar
  • Diana García de O
  • Pablo J. Patiño


Neutrophils are completely differentiated cells that die in tissues a few days after they migrate from the vascular compartment as a consequence of a rigouous apoptotic program. Many of the mediators produced during an inflammatory response delay neutrophil apoptosis allowing a more efficient removal of microorganisms but also favoring the tissue damage by reactive oxygen species (ROS) and lysosomal proteins released by neutrophils. Glucocorticoids delay the apoptosis of neutrophils but the mechanisms are not completely understood. To investigate the inhibition of glucocorticoids on neutrophil apoptosis we have used the glucose/glucose oxidase (G/GO) system as a constant source of hydrogen peroxide. When neutrophils are incubated in the presence of the G/GO system, a significant acceleration of their apoptotic response is observed. Preincubation with 10−6 M, 10−7 M, 10−8 M or 10−9 M of dexamethasone, negatively modulated the spontaneous and G/GO induced apoptosis of neutrophils. Then the G/GO system is a useful model to simulate the oxidative stress of neutrophils, and that the effect of DXM on neutrophil apoptosis depends, at least in part, on blocking the proapoptotic effect of ROS.

Neutrophils apoptosis reactive oxygen species dexamethasone 


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Copyright information

© Plenum Publishing Corporation 2002

Authors and Affiliations

  • Lina M. Ruiz
    • 1
  • Gabriel Bedoya
    • 2
  • James Salazar
    • 3
  • Diana García de O
    • 1
  • Pablo J. Patiño
    • 1
  1. 1.Group of Primary Immunodeficiencies, School of MedicineUniversity of AntioquiaMedellinColombia
  2. 2.Group of Molecular Genetics, School of MedicineUniversity of AntioquiaMedellinColombia
  3. 3.Institute of BiologyUniversity of AntioquiaMedellinColombia

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