title: Localization of three types of arginine vasotocin receptors in the brain and pituitary of the newt Cynops pyrrhogaster.
abstract: The distribution of three types of arginine vasotocin (AVT) receptors in the brain and pituitary of the newt Cynops pyrrhogaster, namely, the V1a-, V2-, and V3/V1b-type receptors, was studied by means of in situ hybridization and immunohistochemistry. mRNA signals and immunoreactive cells for the V1a-type receptor were observed in the telencephalon (mitral layer of the olfactory bulb, dorsal and medial pallium, lateral and medial amygdala, bed nucleus of the decussation of the fasciculus telencephali, bed nucleus of the stria terminalis), diencephalon (anterior preoptic area, magnocellular preoptic nucleus, suprachiasmatic nucleus, ventral thalamus, dorsal and ventral hypothalamic nucleus), mesencephalon (tegmentum, interpeduncular nucleus), and medulla oblongata (median reticular formation, nucleus motorius tegmenti). Cells expressing the V2-type receptor were found in the telencephalon (medial pallium, lateral and medial amygdala, bed nucleus of the decussation of the fasciculus telencephali), and mesencephalon (tegmentum trigemini and facialis). In the paraphysis (possibly the main site of cerebrospinal fluid production), only V2-type receptor mRNA signal and immunoreactivity were detected. V3/V1b-type receptor mRNA was expressed in the diencephalon (dorsal hypothalamic nucleus, nucleus tuberculi posterioris), mesencephalon (tegmentum, interpeduncular nucleus), and medulla oblongata (raphe nucleus), whereas V3/V1b-type-receptor-like immunoreactivity was scarcely detectable in the entire brain. The V3/V1b-type receptor was predominantly expressed in the anterior pituitary. V3/V1b-type receptor and proopiomelanocortin mRNAs were co-localized in the distal lobe of the pituitary. This is the first report of the distribution of three types of AVT receptor in the brain and pituitary of non-mammalian vertebrates.
authors.affiliation: Department of Biology, Faculty of Education and Integrated Arts and Sciences, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan. i-hasunuma@aoni.waseda.jp
authors.forename: Itaru
authors.initials: I
authors.lastname: Hasunuma
authors.forename: Fumiyo
authors.initials: F
authors.lastname: Toyoda
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Kadono
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Hideo
authors.initials: H
authors.lastname: Namiki
authors.forename: Sakae
authors.initials: S
authors.lastname: Kikuyama
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D004027:Diencephalon / Q000737:chemistry / Q000166:cytology; D005455:Fluorescent Antibody Technique; D017403:In Situ Hybridization; D008526:Medulla Oblongata / Q000737:chemistry / Q000166:cytology; D008636:Mesencephalon / Q000737:chemistry / Q000166:cytology; D010903:Pituitary Gland, Anterior / Q000737:chemistry* / Q000166:cytology*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger; D017483:Receptors, Vasopressin / Q000032:analysis* / Q000302:isolation & purification; D012455:Salamandridae / Q000378:metabolism*; D015398:Signal Transduction; D013687:Telencephalon / Q000737:chemistry / Q000166:cytology
chemical_list: D012333:RNA, Messenger; D017483:Receptors, Vasopressin; C034862:vasotocin receptor