Hypoxia Prolongs Neutrophil Survival in Vitro

FEBS Lett. 1995 Sep 25;372(2-3):233-7. doi: 10.1016/0014-5793(95)00986-j.

Abstract

Neutrophil apoptosis represents a major mechanism involved in the resolution of inflammation. Since hypoxia induces apoptosis in several cell lines and is of particular relevance in many disease states, we studied the effect of oxygen concentration on neutrophil survival in vitro. Hypoxia caused a dramatic decrease in neutrophil apoptosis (% apoptosis 20 h: 78.7 +/- 2.2% in 21% O2, 61.4 +/- 6.5% in 2.5% O2, 23.1 +/- 3.2% in 0% O2, n = 5). This was additive to the effect of GM-CSF (50 U/ml), not associated with induction of bcl-2 expression, and was not mimicked by methionine (5 mM), superoxide dismutase (200 micrograms/ml) or Trolox (10 mM) but was mimicked by catalase (250 micrograms/ml). Hence, hypoxia has a bcl-2-independent effect on neutrophil apoptosis that may adversely affect the clearance of these cells from an inflammatory focus.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Hypoxia*
  • Cell Survival / physiology
  • Cells, Cultured
  • Humans
  • Neutrophils / physiology*