Ultrastructural characteristics and conduction velocity of olfactory receptor neuron axons in the olfactory marker protein-null mouse

Edwin R. Griff, Charles A. Greer, Frank Margolis, Matthew Ennis, Michael T. Shipley

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Olfactory receptor neuron (ORN) axon diameters and the conduction velocity of the compound action potential along ORN axons were studied in olfactory marker protein (OMP)-null mice and genotypically matched controls. The compound action potential was distinguished from postsynaptic field potentials by its shorter latency, its persistence following application of cobalt or kynurenic acid that blocked postsynaptic responses, and its ability to follow paired-pulse stimulation at 300 Hz. Blockade of the postsynaptic field responses by kynurenic acid indicates that in the mouse, as in the rat, glutamate is the olfactory nerve transmitter. The mean conduction velocity of ORNs in wild-type control mice was 0.47±0.19 (S.E.M.) m/s (n=5), similar to the conduction velocity reported for other mammals. The mean diameter of ORN axons in control mice was 0.202±0.005 and 0.261±0.006 μm in the OMP-null mice. This increase in fiber diameter in the OMP-nulls predicts an increase in impulse conduction velocity. However, the mean conduction velocity of OMP-null mice, 0.38±0.03 m/s (n=6), was not significantly different from control (P>0.1). The conduction velocity predicted by the increase in fiber diameter in OMP-null mice was within the 95% confidence interval of the measured value. Thus, OMP-null ORNs are normal with respect to the conduction velocity of their axons. The number of axodendritic synapses in the glomeruli of OMP-null mice is higher than in congenic wild-type mice. Copyright (C) 2000.

Original languageEnglish (US)
Pages (from-to)227-236
Number of pages10
JournalBrain Research
Volume866
Issue number1-2
DOIs
StatePublished - Jun 2 2000
Externally publishedYes

Fingerprint

Olfactory Receptor Neurons
Axons
Olfactory Marker Protein
Kynurenic Acid
Action Potentials
Olfactory Nerve
Congenic Mice
Synaptic Potentials
Cobalt
Synapses
Glutamic Acid
Mammals
Mouse Omp protein
Confidence Intervals

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Molecular Biology
  • Developmental Biology
  • Clinical Neurology

Cite this

Ultrastructural characteristics and conduction velocity of olfactory receptor neuron axons in the olfactory marker protein-null mouse. / Griff, Edwin R.; Greer, Charles A.; Margolis, Frank; Ennis, Matthew; Shipley, Michael T.

In: Brain Research, Vol. 866, No. 1-2, 02.06.2000, p. 227-236.

Research output: Contribution to journalArticle

Griff, Edwin R. ; Greer, Charles A. ; Margolis, Frank ; Ennis, Matthew ; Shipley, Michael T. / Ultrastructural characteristics and conduction velocity of olfactory receptor neuron axons in the olfactory marker protein-null mouse. In: Brain Research. 2000 ; Vol. 866, No. 1-2. pp. 227-236.
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