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Induction of Ym1/2 in mouse bone marrow‐derived mast cells by IL‐4 and identification of Ym1/2 in connective tissue type‐like mast cells derived from bone marrow cells cultured with IL‐4 and stem cell factor
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Induction of Ym1/2 in mouse bone marrow‐derived mast cells by IL‐4 and identification of Ym1/2 in connective tissue type‐like mast cells derived from bone marrow cells cultured with IL‐4 and stem cell factor
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Induction of Ym1/2 in mouse bone marrow‐derived mast cells by IL‐4 and identification of Ym1/2 in connective tissue type‐like mast cells derived from bone marrow cells cultured with IL‐4 and stem cell factor
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Journal Article
Induction of Ym1/2 in mouse bone marrow‐derived mast cells by IL‐4 and identification of Ym1/2 in connective tissue type‐like mast cells derived from bone marrow cells cultured with IL‐4 and stem cell factor
2005
Overview
Mast cells play an important role in allergic inflammation by releasing various bioactive mediators. The function of mast cells is enhanced by various stimuli, partly due to the induction of specific genes and their products. Although many inducible genes have been identified, a significant number of genes remain to be identified. Therefore, this study used PCR‐selected cDNA subtraction to establish the profile of induced genes in the connective tissue (CT) type‐like mast cells derived from bone marrow cells cultured in the presence of IL‐4 and stem cell factor. Two hundred and fifty cDNA clones were obtained from the CT type‐like mast cells by PCR‐selected cDNA subtraction. Among them, Ym1/2, a chitinase‐like protein, is one of the most abundantly induced genes. Ym1 is produced by activated macrophages in a parasitic infection, whereas its isotype, Ym2, is highly upregulated in allergic lung disease. In order to differentiate which isotype is expressed in bone marrow cells, specific primers for bone marrow‐derived mast cells (BMMC), and CT type‐like mast cells were used for RT‐PCR. The results showed that Ym1 was constitutively expressed in bone marrow cells and gradually decreased in the presence of IL‐3, whereas Ym2 was induced only in the presence of IL‐4. CT type‐like mast cells from bone marrow cells expressed Ym1 throughout the culture period and Ym2 was induced only by the addition of IL‐4 into BMMC, indicating that IL‐4 is essential for the expression of Ym1/2 genes.
Publisher
Nature Publishing Group,Blackwell Science Ltd
