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Matrix metalloproteinase-9 production, a newly identified function of mast cell progenitors, is downregulated by
1Department of Veterinary Clinic, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, Japan.
Abstract:
Mast cell precursors invade from the peripheral blood into local tissues where they differentiate to their mature phenotypes. However, the mechanism of this migration process has been unclear. We clearly demonstrated here the production and release of matrix metalloproteinase-9 (MMP-9), a matrix-degrading enzyme necessary for leukocyte transmigration, by interleukin-3-dependent mouse mast cell progenitors: bone marrow-derived cultured mast cells and IC-2 mast cells. Because several interleukin-3-independent mast cell lines with active mutations in the c-kit gene did not release MMP-9, the possible involvement of c-kit receptor activation in downregulation of MMP-9 production was predicted. c-kit receptor activation by stem cell factor led to a significant decrease in MMP-9 production of cultured mast cells and IC-2 mast cells transfected with the c-kit gene. Thus, the present results suggest that mast cell precursors are able to produce MMP-9, which may be essential for mast cell migration into tissues, and that stem cell factor may downregulate the MMP-9 production, resulting in engagement of mast cells to matrix components.
Insights
Mast cell precursors release matrix metalloproteinase-9 (MMP-9) for tissue migration. Stem cell factor signaling via c-kit receptor activation downregulates MMP-9, influencing mast cell engagement with tissue matrices.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Mast cell precursors migrate from peripheral blood to tissues, differentiating into mature cells.
- The precise mechanisms governing mast cell precursor migration remain incompletely understood.
Purpose of the Study:
- To elucidate the role of matrix metalloproteinase-9 (MMP-9) in mast cell precursor migration.
- To investigate the influence of c-kit receptor activation on MMP-9 production.
Main Methods:
- Assessed MMP-9 production and release by interleukin-3-dependent mouse mast cell progenitors (cultured mast cells and IC-2 cells).
- Compared MMP-9 release in interleukin-3-independent mast cell lines with c-kit mutations.
- Examined the effect of stem cell factor-induced c-kit receptor activation on MMP-9 production in mast cells.
Main Results:
- Interleukin-3-dependent mast cell progenitors produced and released MMP-9, a key enzyme for leukocyte transmigration.
- Interleukin-3-independent mast cell lines lacking functional c-kit did not release MMP-9.
- Activation of the c-kit receptor by stem cell factor significantly decreased MMP-9 production in mast cells.
Conclusions:
- Mast cell precursors possess the capacity to produce MMP-9, crucial for their migration into tissues.
- Stem cell factor-mediated c-kit activation downregulates MMP-9 production, potentially regulating mast cell adhesion to matrix components.