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Department of Medicine, Chest Institute, Tokyo Women’s Medical College, Tokyo, Japan
Neutrophils constitutively undergo apoptosis at both normal and inflamed sites: an important process that limits the toxic potential of the neutrophil. However, the signal pathway for neutrophil apoptosis is currently unknown. In this study, we evaluated the role of p38-mitogen-activated protein kinase (MAPK) in the spontaneous apoptosis of neutrophils in vitro. We found that p38-MAPK was constitutively tyrosine phosphorylated and activated during spontaneous apoptosis of neutrophils. Inhibition of p38-MAPK by SB203580 and an antisense oligonucleotide delayed apoptosis by approximately 24 h. The antioxidants catalase and N-acetylcysteine delayed neutrophil apoptosis, but failed to inhibit phosphorylation and activation of p38-MAPK. Granulocyte-macrophage CSF and anti-Fas Ab, which altered the rate of apoptosis, did not affect phosphorylation and activation of p38-MAPK. These results suggest that the constitutive phosphorylation and activation of p38-MAPK are involved in the program of spontaneous apoptosis in neutrophils.
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