Immunohistochemical and Electrophysiological Demonstration of Substance P in Human Vestibular Ganglion Cells

Abstract

This study was performed in order to determine the immunohistochemical expression and distribution pattern as well as the electrophysiological actions of substance P in human vestibular ganglion cells. Substance P-like immunostaining was mainly found in the cytoplasm of small vestibular ganglion cells. in contrast, nerve fibers were not labelled. Using intracellular recording techniques, substance P produced a slow depolarization of membrane potentials accompanied by an increase in membrane resistance. Furthermore, an enhanced firing response to depolarization occurred.

Key Words:

• substance P
• Immunohistochemistry
• Electrophysiology
• Human
• vestibular ganglion