title: Neuropeptide Y-immunoreactive neuronal system and colocalization with FMRFamide in the optic lobe and peduncle complex of the octopus (Octopus vulgaris).
abstract: The distribution of neuropeptide Y (NPY)-like immunoreactivity and its colocalization with FMRFamide were investigated in the optic lobe and peduncle complex of the octopus ( Octopus vulgaris) by using immunohistochemical techniques. In the optic lobe cortex, NPY-immunoreactive (NPY-IR) fibers were observed in the plexiform layer, although no NPY-IR somata were observed in the outer or inner granular cell layers. In the optic lobe medulla, NPY-IR somata were seen in the cell islands, and abundant NPY-IR varicose fibers were observed in the neuropil. Most of the NPY-IR structures in the medulla showed FMRFamide-like immunoreactivity. In the peduncle lobe, abundant NPY-IR and FMRFamide-IR (NPY/FMRF-IR) varicose fibers were seen in the basal zone neuropil of the peduncle lobe. In the olfactory lobe, NPY/FMRF-IR varicose fibers were also abundant in the neuropil of the three lobules. NPY/FMRF-IR somata, with processes running to various neuropils, were scattered in the median and posterior lobules. In the optic gland, many NPY/FMRF-IR varicose fibers formed a honeycomb pattern. These observations suggest that NPY/FMRF-IR neurons in the optic lobes participate in the modulation of visual information and that those in the optic gland are involved in the regulation of endocrine function.
authors.affiliation: Department of Biology, Fukuoka University of Education, 729-1 Akama, Munakata, 811-4192 Japan. spiderhs@fukuoka-edu.ac.jp
authors.forename: Hirohumi
authors.initials: H
authors.lastname: Suzuki
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Miho
authors.initials: M
authors.lastname: Nakagawa
authors.forename: Haruko
authors.initials: H
authors.lastname: Uemura
mesh_terms: D000818:Animals; D019835:FMRFamide / Q000378:metabolism*; D005260:Female; D008297:Male; D009474:Neurons / Q000502:physiology; D009478:Neuropeptide Y / Q000378:metabolism*; D049831:Octopodiformes / Q000033:anatomy & histology / Q000378:metabolism*; D009899:Optic Lobe, Nonmammalian / Q000033:anatomy & histology / Q000378:metabolism*
chemical_list: D009478:Neuropeptide Y; D019835:FMRFamide