NMDA receptors are involved in temporal integration in the oculomotor system of the cat

Neuroreport. 1994 Jun 27;5(11):1333-6.

Abstract

Spontaneous eye movements were recorded before and after a microinjection (0.1-0.2 microliter) of either APV (an NMDA receptor antagonist) or NBQX (a non-NMDA receptor antagonist) into the nucleus prepositus hypoglossi (NPH) of the alert cat. A unilateral injection of APV caused bilateral failure of the horizontal gaze-holding system: in the light, each saccade was followed by a post-saccadic drift. A unilateral injection of NBQX caused no sign of gaze-holding failure; in the light, spontaneous eye movements were unaffected; in complete darkness, a nystagmus with linear slow phases directed towards the injected side was observed. We conclude that NMDA receptors of the NPH neurones are involved in the gaze-holding system.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 2-Amino-5-phosphonovalerate / pharmacology*
  • Animals
  • Cats
  • Darkness
  • Eye Movements / physiology
  • Oculomotor Nerve / microbiology*
  • Quinoxalines / pharmacology*
  • Receptors, N-Methyl-D-Aspartate / drug effects*

Substances

  • Quinoxalines
  • Receptors, N-Methyl-D-Aspartate
  • 2,3-dioxo-6-nitro-7-sulfamoylbenzo(f)quinoxaline
  • 2-Amino-5-phosphonovalerate