title: Transport of HRP through Reissner's membrane in experimental endolymphatic hydrops.
abstract: Unilateral endolymphatic hydrops was produced in guinea pigs by cauterization of the endolymphatic sac. Measurements of compound action potential (CAP), cochlear microphonics (CM) and negative summating potential (-SP) confirmed endolymphatic hydrops three months after surgery. In both control and hydropic ears, reaction product of HRP was observed only on the perilymphatic surface of the epithelial cells of Reissner's membrane after 10 min perfusion, while it was observed on both the endolymphatic and perilymphatic surfaces after 30 min perfusion. Epithelial tight junctions were not stained and labelled pinocytotic vesicles were observed in the epithelial cells. These findings suggest that the transport of HRP through Reissner's membrane is unchanged in endolymphatic hydrops and that the epithelial junctions are tight regardless of the distension of Reissner's membrane.
authors.affiliation: Department of Otolaryngology, Osaka University Medical School, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sakagami
authors.forename: K
authors.initials: K
authors.lastname: Fukazawa
authors.forename: K
authors.initials: K
authors.lastname: Kitamura
authors.forename: K
authors.initials: K
authors.lastname: Doi
authors.forename: N
authors.initials: N
authors.lastname: Mori
authors.forename: T
authors.initials: T
authors.lastname: Matsunaga
mesh_terms: D000818:Animals; D001692:Biological Transport; D003053:Cochlear Duct / Q000378:metabolism* / Q000648:ultrastructure; D004487:Edema / Q000378:metabolism* / Q000473:pathology; D004712:Endolymphatic Sac / Q000378:metabolism* / Q000648:ultrastructure; D004848:Epithelium / Q000378:metabolism; D006168:Guinea Pigs; D006651:Histocytochemistry; D006735:Horseradish Peroxidase / Q000493:pharmacokinetics*; D007365:Intercellular Junctions / Q000378:metabolism / Q000648:ultrastructure; D012835:Silver Nitrate; D015837:Vestibular Diseases / Q000378:metabolism* / Q000473:pathology
chemical_list: D012835:Silver Nitrate; D006735:Horseradish Peroxidase