Abstract:
:Recent studies have identified nonredundant roles for basophils in immune responses including allergy and protective immunity. It is well known that activated basophils release granule contents such as histamine and proteases as do mast cells. However, the functional significance of basophil-derived proteases remains poorly understood in contrast to those released from mast cells. For this study we generated a line of knockout (KO) mice deficient for mouse mast cell protease-11 (mMCP-11) that is preferentially expressed by basophils rather than mast cells. In spite of normal development of basophils, the mMCP-11-deficient mice showed amelioration of immunoglobulin E-mediated chronic allergic inflammation (IgE-CAI), with reduction of cutaneous swelling, microvascular permeability, and leukocyte infiltration in the skin lesion, when KO mice were compared with wild-type mice. Repeated administration of recombinant mMCP-11 in the skin induced infiltration of leukocytes, including basophils, in a tryptase activity-dependent manner. The transwell migration assay in vitro suggested that mMCP-11-mediated proteolytic products of serum protein promoted migration of basophils, eosinophils, and macrophages via 1 or more G protein-coupled receptors. Thus, basophil tryptase mMCP-11 is a crucial effector molecule for the induction of IgE-CAI. This is the first demonstration that the basophil-derived protease plays a significant role in vivo.
journal_name
Bloodjournal_title
Bloodauthors
Iki M,Tanaka K,Deki H,Fujimaki M,Sato S,Yoshikawa S,Yamanishi Y,Karasuyama Hdoi
10.1182/blood-2016-07-729392subject
Has Abstractpub_date
2016-12-22 00:00:00pages
2909-2918issue
25eissn
0006-4971issn
1528-0020pii
blood-2016-07-729392journal_volume
128pub_type
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