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Anti-apoptotic Effects of House Dust Mite, S100A8 and S100A9 on Spontaneous Apoptosis of Neutrophils in Coculture with Immune Cells and in the Presence of T Helper Cytokines

  • Kim, In Sik (Department of Biomedical Laboratory Science, School of Medicine, Eulji University) ;
  • Lee, Ji-Sook (Department of Clinical Laboratory Science, Wonkwang Health Science University)
  • Received : 2015.04.22
  • Accepted : 2015.06.08
  • Published : 2015.06.30

Abstract

House dust mite (HDM) as a major allergen and damage-associated molecular pattern (DAMP) such as S100A8 and S100A9 trigger the pathogenesis and severity of allergic disease such as asthma. Regulation of neutrophil apoptosis is an important immune response and its dysregulation is involved in pathogenesis of allergic diseases. In this study, we examined the effects of HDM, S100A8 and S100A9 on spontaneous apoptosis of normal neutrophils. We considered the importance of the difference between in vitro and in vivo results and developed a new in vitro system consisting of a combination of immune cells and T helper (Th) cytokines. Extract of Dermatophagoides pteronyssinus (DP), S100A8, and S100A9 inhibited neutrophil apoptosis in culture of neutrophils alone without other leukocytes. DP and S100A8 more strongly suppressed neutrophil apoptosis in combinations of neutrophils, eosinophils, lymphocytes or monocytes than in a culture of neutrophils alone. Anti-apoptotic effect of S100A9 in the mixture of immune cells was similar to that in neutrophils. DP, S100A8, and S100A9 blocked neutrophil apoptosis, regardless of pretreatment with a T helper (Th) 1 cytokine (IFN-$\gamma$), Th2 cytokines (IL-4 and IL-10), a Th9 cytokine (IL-9), a Th17 cytokine (IL-17), a Treg-producing cytokine (TGF-$\beta$). These findings may enable elucidation of allergy pathogenesis due to HDM and DAMP.

Keywords

References

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