title: Presenilin-1 mRNA and beta-amyloid precursor protein mRNA are expressed in the developing rat olfactory and vestibulocochlear systems.
abstract: The mRNA expression of presenilin-1 (PS1) and beta-amyloid precursor protein (betaAPP) was investigated in the embryonic day 20 rat olfactory bulb, nasal cavity, and inner ear using in situ hybridization histochemistry. In the olfactory bulb, PS1 mRNA was strongly expressed in both olfactory bulb neuroepithelium and the differentiating olfactory bulb. In contrast, betaAPP mRNA was preferentially expressed in differentiating fields. In the nasal cavity, PS1 mRNA was strongly expressed throughout the olfactory epithelium, while betaAPP mRNA expression was concentrated in the middle part of the epithelium. In the membrane labyrinth of the inner ear, although PS1 mRNA was evenly distributed in both sensory epithelium and supporting cells, betaAPP mRNA was exclusively expressed in the sensory epithelium. These data suggest that PS1 is expressed earlier than betaAPP, and that PS1 and betaAPP co-operatively play pivotal roles in the development of the olfactory and vestibulocochlear systems.
authors.affiliation: Department of Anatomy and Neuroscience, Osaka University Medical School, Suita, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Utsumi
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: H
authors.initials: H
authors.lastname: Tanimukai
authors.forename: T
authors.initials: T
authors.lastname: Kudo
authors.forename: M
authors.initials: M
authors.lastname: Nishimura
authors.forename: M
authors.initials: M
authors.lastname: Takeda
authors.forename: M
authors.initials: M
authors.lastname: Tohyama
mesh_terms: D000544:Alzheimer Disease; D016564:Amyloid beta-Protein Precursor / Q000096:biosynthesis*; D000818:Animals; D007758:Ear, Inner / Q000737:chemistry / Q000196:embryology*; D008565:Membrane Proteins / Q000096:biosynthesis*; D009296:Nasal Cavity / Q000737:chemistry / Q000196:embryology*; D009830:Olfactory Bulb / Q000737:chemistry / Q000196:embryology*; D053764:Presenilin-1; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017208:Rats, Wistar
chemical_list: D016564:Amyloid beta-Protein Precursor; D008565:Membrane Proteins; D053764:Presenilin-1; D012333:RNA, Messenger