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Eosinophils are involved in [[Type I Hypersensitivity|type I hypersensitivity]] reactions.
Eosinophils are involved in [[Type I Hypersensitivity|type I hypersensitivity]] reactions.
In an infection or allergic reaction, eosinophil numbers are increased by the release of [[Leukopoiesis#Eosinophils|Il-3, Il-5 and GM-CSF]] by Th2 and [[Mast Cells|mast cells]]. This causes more eosinophils to be released into the blood stream. The eosinophils are then attracted to the required site of action by chemicals known as eotaxins which are released by mast cells. Histamine and its breakdown products also act as attractants. These same products activate the eosinophil increasing its affinity to bind to [[IgE]].
In an infection or allergic reaction, eosinophil numbers are increased by the release of [[Leukopoiesis#Eosinophils|IL-3, IL-5 and GM-CSF]] by T<sub>H</sub>2 and [[Mast Cells|mast cells]]. This causes more eosinophils to be released into the blood stream. The eosinophils are then attracted to the required site of action by chemicals known as eotaxins which are released by mast cells. Histamine and its breakdown products also act as attractants. These same products activate the eosinophil increasing its affinity to bind to [[IgE]].
Large numbers of eosinophils in a tissue give the tissue a greenish colour.
Large numbers of eosinophils in a tissue give the tissue a greenish colour.