Abstract
We have used immunohistochemistry to examine the subcellular localization of monoamine oxidase type B (MAO-B) in the taste bud of the rat circumvallate papilla. Electron microscopy showed that MAO-B was localized to the outer membranes of mitochondria in nerve terminals of afferent and efferent fibers, as well as in taste bud cells. MAO-B also existed on the mitochondrial outer membranes within myelinated and unmyelinated axons in the lamina propria beneath the taste bud. It is suggested that MAO-B-containing mitochondria are localized in peripheral branches and their terminals of sensory neurons for taste. The present study is the first to reveal the localization of MAO-B in sensory organs.
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