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The pattern of cerebrovascular substance P (SP) and calcitonin gene-related peptide (CGRP) immunoreactive (-IR) innervation was investigated in the newt. SP-IR nerves supplying the cerebral arterial tree and choroid plexus were positive for CGRP, but negative for vasoactive intestinal polypeptide or neuropeptide Y. It is suggested that cerebrovascular SP- and CGRP-IR axons are sensory in nature. The supply of SP- and CGRP-IR nerves to the major cerebral arteries is relatively poor. Nevertheless, numerous SP- and CGRP-IR axons, which are contained in the fiber bundles on the cerebral carotid artery and the basilar artery, spread widely over the microvascular-epithelial regions of the choroid plexuses. It must be considered in relation to the significant role of SP- and CGRP-IR neuronal mechanisms responsible to the microcirculation, cerebrospinal fluid (CSF) production and transport action within the choroid plexus in the nutrition of the newt brain via the CSF.

journal of veterinary medical science

Innervation of Two Peptidergic (Substance P and Calcitonin gene-related peptide) Nerves in the Cerebral Arteries and Choroid Plexus of the Japanese Newt (Triturus pyrrhogaster).