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RI Expression Through a STAT6-Dependent Mechanism1



Departments of
*
Biology and
Microbiology and Immunology, Virginia Commonwealth University, Richmond, VA 23284
Mast cell activation by IgE-mediated stimuli is a central event in
atopic disease. The regulation of the mast cell high affinity receptor,
Fc
RI, is poorly understood. We show that IL-4 can inhibit Fc
RI
expression on mouse bone marrow-derived mast cells and fetal
liver-derived mast cell progenitors. This effect could be observed at
2.5 ng/ml IL-4 and was dose dependent. IL-4-mediated inhibition of
cultured BMMC required 4 days of stimulation and was sustained at
maximum levels for at least 21 days. The inhibition of Fc
RI
expression resulted in decreased sensitivity to IgE-mediated
stimulation, as measured by serotonin release, and the induction of
mRNA for IL-4, IL-5, IL-6, and IL-13. Additionally, IL-4 could abrogate
the IgE-mediated increase in Fc
RI expression. Lastly, IL-4-mediated
inhibition was dependent upon expression of the STAT6 transcription
factor, as STAT6-deficient bone marrow-derived mast cells did not
decrease Fc
RI levels in response to IL-4. These data argue for a
homeostatic role of IL-4 in the regulation of Fc
RI expression, a
role that could be critical to understanding atopic
disease.
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