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J. Exp. Med.,
Volume 188, Number 9, November 2, 1998 1657-1668
By

From the * Arthritis and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal and
Skin Diseases and the To characterize gene expression in activated mast cells more comprehensively than heretofore,
we surveyed the changes in genetic transcripts by the method of serial analysis of gene expression in the RBL-2H3 line of rat mast cells before and after they were stimulated through their
receptors with high affinity for immunoglobulin E (Fc
National Center for Biotechnology Information, National Library of Medicine,
National Institutes of Health, Bethesda, Maryland 20892
RI). A total of 40,759 transcripts derived from 11,300 genes were analyzed. Among the diverse genes that had not been previously associated with mast cells and that were constitutively expressed were those for the cytokine
macrophage migration inhibitory factor neurohormone receptors such as growth hormone-
releasing factor and melatonin and components of the exocytotic machinery. In addition, several dozen transcripts were differentially expressed in response to antigen-induced clustering of
the Fc
RI. Included among these were the genes for preprorelaxin, mitogen-activated protein
kinase kinase 3, and the dual specificity protein phosphatase, rVH6. Significantly, the majority
of genes differentially expressed in this well-studied model of mast cell activation have not been identified before this analysis.
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