Basophils and mast cells are similar but unique secretory cells with a
well-documented role in immediate-hypersensitivity reactions. The
presence of these cells in various cell- mediated hypersensitivity
reactions, in tissues of multiple diseases, and as a component of the
host reaction to injury and repair in numerous circumstances is well
known. Release of stored and newly generated mediators of inflammation
from basophils and mast cells contributes to the cascade of pathogenetic
events in circumstances under which these release reactions occur.
Despite insights acquired through studies of these pathologic events,
the role of basophils and mast cells and their secretory products in
health is not known. In this book, I review much of the structural
information regarding basophils and mast cells of multiple species.
Ultrastructural studies of rat mast cells historically precede and
quantitatively exceed similar studies of basophils and mast cells of
other species. Therefore, I first review these background studies as an
entity. Then I discuss the contents of two prominent organelles-granules
and lipid bodies-in basophils and mast cells of several species. The
ultrastructural morphology of basophils and mast cells in three species
is presented in detail to establish appropriate guidelines for their
recognition and to provide general rules for analysis which are
appropriate for the identification of these cells in other species as
well.