title: High affinity D- and L-serine transporter Asc-1: cloning and dendritic localization in the rat cerebral and cerebellar cortices.
abstract: System asc transporter Asc-1, expressed in the brain, transports D- and L-serine with high affinity. To determine the localization of Asc-1 in the rat brain, we isolated a cDNA for the rat orthologue of Asc-1. The encoded protein designated as rAsc-1 (rat Asc-1) exhibited 98% sequence identity to mouse Asc-1 (mAsc-1). Based on amino acid sequences of rAsc-1 and mAsc-1, two polyclonal antibodies against Asc-1 were generated and used for the immunohistochemical analysis on the cerebral and cerebellar cortices of rats and mice. Asc-1 immunoreactivity was detected in neurons, including cerebellar Purkinje neurons and pyramidal neurons in the neocortex and hippocampus. It was clearly localized in dendrites as well as somata. The localization of Asc-1 in brain suggests the significant contribution of Asc-1 to amino acid mobilization in brains including the synaptic clearance of D-serine and the neuronal uptake of L-serine that is essential for survival and dendrite growth of Purkinje neurons in particular.
authors.affiliation: First Department of Physiology, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Matsuo
authors.forename: Yoshikatsu
authors.initials: Y
authors.lastname: Kanai
authors.forename: Motohide
authors.initials: M
authors.lastname: Tokunaga
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nakata
authors.forename: Arthit
authors.initials: A
authors.lastname: Chairoungdua
authors.forename: Hisako
authors.initials: H
authors.lastname: Ishimine
authors.forename: Shingo
authors.initials: S
authors.lastname: Tsukada
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Ooigawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nawashiro
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Jun
authors.initials: J
authors.lastname: Fukuda
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Endou
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002525:Cerebellar Cortex / Q000378:metabolism*; D002540:Cerebral Cortex / Q000378:metabolism*; D003001:Cloning, Molecular / Q000379:methods; D003712:Dendrites / Q000235:genetics / Q000378:metabolism*; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D008969:Molecular Sequence Data; D011485:Protein Binding; D051381:Rats; D017207:Rats, Sprague-Dawley; D017386:Sequence Homology, Amino Acid; D012694:Serine / Q000032:analysis / Q000378:metabolism*; D014157:Transcription Factors / Q000032:analysis* / Q000235:genetics
chemical_list: D014157:Transcription Factors; C459902:Trip4 protein, mouse; D012694:Serine