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Histamine receptors in mammalian retinas
Author(s) -
Gastinger Matthew J.,
Barber Alistair J.,
Vardi Noga,
Marshak David W.
Publication year - 2006
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.20902
Subject(s) - histaminergic , biology , postsynaptic potential , histamine , receptor , histamine receptor , neuroscience , hypothalamus , histamine h3 receptor , microbiology and biotechnology , retina , anatomy , endocrinology , biochemistry , antagonist
Mammalian retinas are innervated by histaminergic axons that originate from perikarya in the posterior hypothalamus. To identify the targets of these retinopetal axons, we localized histamine receptors (HR) in monkey and rat retinas by light and electron microscopy. In monkeys, puncta containing HR3 were found at the tips of ON‐bipolar cell dendrites in cone pedicles and rod spherules, closer to the photoreceptors than the other neurotransmitter receptors. This is the first ultrastructural localization of any histamine receptor and the first direct evidence that HR3 is present on postsynaptic membranes in the central nervous system. In rat retinas, most HR1 were localized to dopaminergic amacrine cells. The differences in histamine receptor localization may reflect the differences in the activity patterns of the two species. J. Comp. Neurol. 495:658–667, 2006. © 2006 Wiley‐Liss, Inc.