Transport pathways in rat lingual epithelium.

Published

Journal Article

Measurements of ion transport across isolated lingual epithelium of rat were correlated with electrophysiological recordings from taste nerves. At hyperosmotic concentrations of NaCl, sodium ions enter the mucosal membrane of the isolated epithelium partially through an amiloride-inhibitable pathway and exit the serosal membrane through a Na+-K+-ATPase. At hyposmotic concentrations of KCl, potassium ions enter the mucosal membrane through a K+ pathway that is inhibited by 4-aminopyridine and exit at the serosal membrane through a K+ pathway that is inhibited by BaCl2. The inhibition of sodium transport by amiloride and potassium transport by 4-aminopyridine is consistent with previously published electrophysiological recordings from the chorda tympani nerve bundle (CT) and recordings from nucleus of the solitary tract (NST) obtained here. The responses to NaCl are greater than the responses to KCl at equimolar concentrations over the entire concentration range both in epithelial and neural measurements. At hyposmotic concentrations of NaCl the epithelial responses include inward sodium and outward chloride components. Isolated rat tongue is only slightly stimulated by D-glucose or sucrose as are the CT and NTS responses. These data suggest that events in taste transduction can be understood, in part, by measuring the epithelial responses of isolated rat tongue.

Full Text

Duke Authors

Cited Authors

  • Simon, SA; Robb, R; Schiffman, SS

Published Date

  • February 1, 1988

Published In

Volume / Issue

  • 29 / 2

Start / End Page

  • 257 - 267

PubMed ID

  • 2834749

Pubmed Central ID

  • 2834749

International Standard Serial Number (ISSN)

  • 0091-3057

Digital Object Identifier (DOI)

  • 10.1016/0091-3057(88)90154-2

Language

  • eng

Conference Location

  • United States