Abstract
The GLW-amide family is a neuropeptide family found in cnidarian species and is characterized by the C-terminal amino acid sequence -Gly-Leu-Trp-NH(2). To detect mammalian peptides structurally related to the GLW-amide family, we examined rat brain by immunohistochemistry with an anti-GLW-amide antibody. GLW-amide-like immunoreactivity (GLW-amide-LI) was observed in thin varicose fibers in some regions of the brain. Most neurons showing GLW-amide-LI were observed in the laterodorsal tegmental nucleus, pedunculopontine tegmental nucleus, and trigeminal/spinal ganglia. These results strongly suggest that the rat nervous system contains as yet unidentified GLW-amide-like peptides, and that GLW-amide-LI in the brain is a good marker for ascending projections from mesopontine cholinergic neurons.
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