Allergen-induced proteolytic cleavage of annexin-1 and activation of cytosolic phospholipase A2 in the lungs of a mouse model of asthma

Proteomics
Youn Wook ChungIck Young Kim

Abstract

To identify proteins that might play an important role in allergen-induced asthma, we analyzed lung extracts prepared from allergen (ovalbumin)-challenged animals in a mouse model of this condition. The combination of two-dimensional gel electrophoresis and mass spectrometry revealed that annexin-1, a 37 kDa anti-inflammatory protein that inhibits the activity of cytosolic phospholipase A(2) (cPLA(2)), was down-regulated by allergen challenge in the lungs of ovalbumin-sensitized mice. Immunoblot analysis showed that this effect of ovalbumin challenge was attributable to proteolytic cleavage of annexin-1. The ovalbumin-induced degradation of annexin-1 was blocked by pretreatment of mice with the antioxidant N-acetylcysteine (NAC) or with sodium selenite, both of which have previously been shown to exert anti-inflammatory effects in this asthma model. Ovalbumin challenge also both increased the expression of cPLA(2) in lung tissue and reduced the extent of the interaction between cPLA(2) and annexin-1, and these effects were inhibited by NAC or selenite. Moreover, the concentrations of cysteinyl leukotrienes in bronchoalveolar lavage fluid and of leukotriene B(4) in lung tissue were increased by ovalbumin challenge in a NAC- or s...Continue Reading

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