title: [The source of transitory innervation of suprachiasmatic nucleus by tyrosine hydroxylase-immunoreactive fibers during the postnatal period in rats].
abstract: Suprachiasmatic nucleus in the rats during early postnatal development is transitorily innervated by tyrosine hydroxylase-immunoreactive fibers that are neither catecholamine- nor serotoninergic. The goal of this immunocytochemical investigation was to find out if tyrosine hydroxylase-immunoreactive neurons of anterior hypothalamus could be the source of this innervation. According to the obtained immunocytochemical data, multiple multipolar tyrosine hydroxylase-immunoreactive neurons are localized around the suprachiasmatic nucleus in the rats at days 2 and 10 of postnatal development. Most of them were observed ventrally and laterally to the nucleus. The axons of the neurons are oriented towards the suprachiasmatic nucleus. Further investigation demonstrated considerably decreased number of tyrosine hydroxylase-immunoreactive neurons surrounding the suprachiasmatic nucleus in the adult animals as compared to early postnatal period, which correlates to the number of tyrosine hydroxylase-immunoreactive fibers in this nucleus. Hence, tyrosine hydroxylase-immunoreactive neurons in the ventral region of anterior hypothalamus can be considered as a potential source of transitory innervation of suprachiasmatic nucleus by tyrosine hydroxylase-immunoreactive fibers during early postnatal development.
authors.affiliation: Anokhin Institute of Normal Physiology, Russian Academy of Medical Sciences, Baltiiskaya ul. 8, Moscow, 125315 Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Mirochnik
authors.forename: I G
authors.initials: IG
authors.lastname: Makarenko
authors.forename: M V
authors.initials: MV
authors.lastname: Ugriumov
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D005260:Female; D008297:Male; D009412:Nerve Fibers / Q000276:immunology / Q000378:metabolism*; D009474:Neurons / Q000276:immunology / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D012737:Sex Factors; D013493:Suprachiasmatic Nucleus / Q000502:physiology*; D014446:Tyrosine 3-Monooxygenase / Q000276:immunology / Q000378:metabolism*
chemical_list: D014446:Tyrosine 3-Monooxygenase
vernacular_title: Istochnik tranzitornoĭ innervatsii suprakhiazmaticheskogo iadra tirozingidroksilaza-immunoreaktivnymi voloknami v postnatal'nom periode u krys.