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Mast cell activation is differentially affected by heat shock
Esmaeil Mortaz1, Frank A Redegeld, Maurice W van der Heijden
1Department of Pharmacology and Pathophysiology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands.
Experimental Hematology
|July 26, 2005
Summary
Heat shock inhibits mast cell degranulation by disrupting calcium signaling pathways. This effect is linked to altered kinase and phosphatase activity, impacting allergic responses.
Area of Science:
- Immunology
- Cellular Biology
Background:
- Mast cells are crucial in allergic reactions, releasing mediators upon IgE receptor activation.
- Heat shock has previously been shown to suppress cytokine production in mast cells.
Purpose of the Study:
- To investigate the effects of heat shock on mast cell activation and mediator release.
- To elucidate the signaling mechanisms underlying heat shock-induced suppression of mast cell degranulation.
Main Methods:
- Mouse bone marrow-derived mast cells (BMMC) were subjected to heat shock.
- Degranulation (beta-hexosaminidase release) and leukotriene C4 (LTC4) production were measured.
- Signal transduction pathways, including calcium mobilization and protein phosphorylation, were analyzed.
Main Results:
- Heat shock inhibited BMMC degranulation but did not affect LTC4 production.
- Heat shock suppressed calcium mobilization and tyrosine phosphorylation of Syk and SHIP.
- Increased phosphorylation of SHP-1 and -2, along with enhanced tyrosine phosphatase activity, was observed.
Conclusions:
- Heat shock inhibits mast cell degranulation by interfering with IgE receptor-mediated signaling.
- The observed inhibition is attributed to a shift in the balance between kinase and phosphatase activity.