Abstract
It is possible to divide surface receptors on mast cells conceptually into three groups. The first consists of immune response receptors. The index receptor for this group is Fc epsilon RI, now joined by Fc gamma receptors and receptors for complement products. The second group of receptors are those that are involved in growth and differentiation, such as those for interleukin-3 and stem cell factor. The third group consists of receptors regulating mast cell trafficking and distribution. Principle among the latter group of receptors are those that engage extracellular matrix components, including the classical integrin receptors. The engagement of mast cells to matrix components not only has relevance in determining the tissue distribution of mast cells, but also appears to have a major influence on the biologic responsiveness of mast cells to immune- and growth-factor-receptor-mediated signals.
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