title: A procedure for in situ hybridization combined with retrograde labeling of neurons: application to the study of cell adhesion molecule expression in Dil-labeled rat pyramidal neurons.
abstract: We have devised a simple method that combines retrograde labeling of projecting neurons and in situ hybridization histochemistry to examine mRNA expression in the retrogradely labeled neurons. First, projecting neurons were retrogradely labeled in vivo by injection of the lipophilic neuronal tracer Dil. The fluorescence of the labeled neurons in the brain slices was photoconverted into stable DAB precipitate by green light illumination. The slices were cut into thinner sections and processed for detection of specific mRNA by in situ hybridization. Using this highly sensitive method, we demonstrate here that the corticospinal tract neurons in newborn rats express mRNA for the cell adhesion molecule L1. TAG-1 mRNA was not detected in these neurons. Therefore, the present method provides an important tool to study the molecular expression of projection neurons during the development of neuronal circuitry.
authors.affiliation: Department of Anatomy, Fukui Medical School, Japan.
authors.forename: K E
authors.initials: KE
authors.lastname: Fujimori
authors.forename: R
authors.initials: R
authors.lastname: Takauji
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshihara
authors.forename: A
authors.initials: A
authors.lastname: Tamada
authors.forename: K
authors.initials: K
authors.lastname: Mori
authors.forename: N
authors.initials: N
authors.lastname: Tamamaki
mesh_terms: D000345:Affinity Labels; D000818:Animals; D002232:Carbocyanines; D015815:Cell Adhesion Molecules / Q000032:analysis* / Q000096:biosynthesis / Q000235:genetics; D015816:Cell Adhesion Molecules, Neuronal; D058969:Contactin 2; D005456:Fluorescent Dyes; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D039841:Leukocyte L1 Antigen Complex; D008562:Membrane Glycoproteins / Q000032:analysis / Q000096:biosynthesis / Q000235:genetics; D019006:Neural Cell Adhesion Molecules / Q000032:analysis / Q000096:biosynthesis / Q000235:genetics; D017966:Pyramidal Cells / Q000737:chemistry* / Q000648:ultrastructure; D011712:Pyramidal Tracts / Q000737:chemistry / Q000648:ultrastructure; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000345:Affinity Labels; D002232:Carbocyanines; D015815:Cell Adhesion Molecules; D015816:Cell Adhesion Molecules, Neuronal; C548676:Cntn2 protein, rat; D058969:Contactin 2; D005456:Fluorescent Dyes; D039841:Leukocyte L1 Antigen Complex; D008562:Membrane Glycoproteins; D019006:Neural Cell Adhesion Molecules; D012333:RNA, Messenger; C024286:3,3'-dioctadecylindocarbocyanine