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Leukotriene formation by mouse connective tissue mast cells
B A Jakschik1, L F Harrington, R Malaviya
1Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, MO 63110.
Eicosanoids
|January 1, 1992
Summary
Mouse peritoneal mast cells can produce leukotriene C4, a key inflammatory mediator. This production requires co-culture with fibroblasts and is enhanced by IL-3, demonstrating mast cell involvement in inflammatory responses.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Mast cells are crucial in allergic and inflammatory responses.
- Leukotriene C4 (LTC4) is a potent mediator released during mast cell degranulation.
- Previous studies suggested but did not definitively prove mast cell synthesis of LTC4.
Purpose of the Study:
- To investigate the capacity of mouse peritoneal mast cells to synthesize leukotriene C4.
- To identify factors influencing leukotriene production by mast cells.
Main Methods:
- Peritoneal cells from various mouse strains, including mast cell-deficient mice, were stimulated with IgE/antigen.
- Purified mast cells were co-cultured with 3T3 fibroblasts.
- Leukotriene C4 production was measured.
- Western blot analysis was used to detect 5-lipoxygenase expression.
Main Results:
- IgE/antigen stimulation induced leukotriene C4 release from wild-type mouse peritoneal cells, but not from mast cell-deficient mice.
- Purified mast cells initially showed no detectable LTC4 synthesis, which was restored upon co-culture with fibroblasts.
- Interleukin-3 (IL-3) enhanced LTC4 synthesis.
- A 5-lipoxygenase inhibitor blocked leukotriene formation, and 5-lipoxygenase was detected in mast cells.
Conclusions:
- Mouse peritoneal (connective tissue) mast cells are capable of synthesizing significant amounts of leukotriene C4.
- Mast cell leukotriene synthesis is dependent on interactions with other cells, such as fibroblasts.
- These findings highlight the direct role of mast cells in producing inflammatory mediators.