Role of galectin-3 in mast cell functions: galectin-3-deficient mast cells exhibit impaired mediator release and defective JNK expression - PubMed

Role of galectin-3 in mast cell functions: galectin-3-deficient mast cells exhibit impaired mediator release and defective JNK expression

Huan-Yuan Chen et al. J Immunol. 2006.

Abstract

Galectin-3 is a member of the beta-galactoside-binding animal lectin family expressed in various cell types, including mast cells. To determine the role of galectin-3 in the function of mast cells, we studied bone marrow-derived mast cells (BMMC) from wild-type (gal3(+/+)) and galectin-3-deficient (gal3(-/-)) mice. Cells from the two genotypes showed comparable expression of IgE receptor and c-Kit. However, upon activation by FcepsilonRI cross-linkage, gal3(-/-) BMMC secreted a significantly lower amount of histamine as well as the cytokine IL-4, compared with gal3(+/+) BMMC. In addition, we found significantly reduced passive cutaneous anaphylaxis reactions in gal3(-/-) mice compared with gal3(+/+) mice. These results indicate that there is a defect in the response of mast cells in gal3(-/-) mice. Unexpectedly, we found that gal3(-/-) BMMC contained a dramatically lower basal level of JNK1 protein compared with gal3(+/+) BMMC, which is probably responsible for the lower IL-4 production. The decreased JNK1 level in gal3(-/-) BMMC is accompanied by a lower JNK1 mRNA level, suggesting that galectin-3 regulates the transcription of the JNK gene or processing of its RNA. All together, these results point to an important role of galectin-3 in mast cell biology.

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