Generation of a new congenic mouse strain with enhanced chymase expression in mast cells.

Generation of a new congenic mouse strain with enhanced chymase expression in mast cells.
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DOI:
10.1371/journal.pone.0084340
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Zhao ZJ
Zhao ZJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Jin X;Zhao W;Shi K;Ho WT;Zhao ZJ

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Mast cells are effector cells best known for their roles in IgE-associated allergy, but they also play a protective role in defense against pathogens. These cells express high levels of proteases including chymase, tryptase and carboxypeptidase. In the present study, we identified a congenic strain of C57BL/6 mice expressing an extraordinarily high level of chymases Mcp-2 and Mcp-4 in mast cells. The overexpression was associated with variant Mcp-2 and Mcp-4 genes originated from DBA/2 mice that also expressed high levels of the two enzymes. Real time PCR analysis revealed that Mcp-2 and Mcp-4 were selectively overexpressed as tryptases, Cpa3 and several other chymases were kept at normal levels. Reporter gene assays demonstrated that single-nucleotide polymorphisms (SNPs) in the promoter region of Mcp-2 gene may be partly responsible for the increased gene transcription. Our study provides a new model system to study the function of mast cell chymases. The data also suggest that expression of chymases differs considerably in different strains of mice and the increased chymase activity may be responsible for some unique phenotypes observed in DBA/2 mice.
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