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The Journal of Neurophysiology Vol. 82 No. 4 October 1999, pp. 1786-1792
Copyright ©1999 by the American Physiological Society
1Laboratory for Neuronal Recognition
Molecules,
Kashiwadani, Hideki,
Yasnory F. Sasaki,
Naoshige Uchida, and
Kensaku Mori.
Synchronized Oscillatory Discharges of Mitral/Tufted Cells With
Different Molecular Receptive Ranges in the Rabbit Olfactory Bulb. J. Neurophysiol. 82: 1786-1792, 1999. Individual glomeruli in the mammalian olfactory bulb represent
a single or a few type(s) of odorant receptors. Signals from different
types of receptors are thus sorted out into different glomeruli. How
does the neuronal circuit in the olfactory bulb contribute to the
combination and integration of signals received by different glomeruli?
Here we examined electrophysiologically whether there were functional
interactions between mitral/tufted cells associated with different
glomeruli in the rabbit olfactory bulb. First, we made simultaneous
recordings of extracellular single-unit spike responses of
mitral/tufted cells and oscillatory local field potentials in the
dorsomedial fatty acid-responsive region of the olfactory bulb in
urethan-anesthetized rabbits. Using periodic artificial inhalation, the
olfactory epithelium was stimulated with a homologous series of
n-fatty acids or n-aliphatic aldehydes.
The odor-evoked spike discharges of mitral/tufted cells tended to
phase-lock to the oscillatory local field potential, suggesting that
spike discharges of many cells occur synchronously during odor
stimulation. We then made simultaneous recordings of spike discharges
from pairs of mitral/tufted cells located 300-500 µm apart and
performed a cross-correlation analysis of their spike responses to odor
stimulation. In ~27% of cell pairs examined, two cells with distinct
molecular receptive ranges showed synchronized oscillatory discharges
when olfactory epithelium was stimulated with one or a mixture of
odorant(s) effective in activating both. The results suggest that the
neuronal circuit in the olfactory bulb causes synchronized spike
discharges of specific pairs of mitral/tufted cells associated with
different glomeruli and the synchronization of odor-evoked spike
discharges may contribute to the temporal binding of signals derived
from different types of odorant receptor.
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