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Volume 16, Number 15,
Issue of August 1, 1996
pp. 4625-4637
Copyright ©1996 Society for Neuroscience
Electrophysiological Characterization of Chemosensory Neurons
from the Mouse Vomeronasal Organ
Received March 18, 1996; revised May 1, 1996; accepted May 2, 1996.
Emily R. Liman and
David P. Corey
Department of Neurology and Howard Hughes Medical Institute,
Harvard Medical School, and Massachusetts General Hospital, Boston,
Massachusetts 02114
The mechanism of sensory transduction in chemosensory neurons of
the vomeronasal organ (VNO) is not known. Based on molecular data, it
is likely to be different from that mediating sensory transduction in
the main olfactory system. To begin to understand this system, we have
characterized the electrophysiological properties of dissociated mouse
VNO neurons with patch-clamp recording. Sensory neurons were
distinguished from nonsensory neurons by the presence of a dendrite, by
immunoreactivity for olfactory marker protein, and by the firing of
action potentials. The resting potential of VNO neurons was
approximately 60 mV, and the average input resistance was 3 G .
Current injections as small as 1-2 pA elicited steady trains of action
potentials that showed no sign of adaptation during a 2 sec stimulus
duration. The voltage-gated conductances in VNO neurons are distinct
from those in olfactory neurons. The Na+ current
is composed of two components; the major component was TTX-sensitive
(Ki = 3.6 nM). The
outward K+ current activates at 30 mV with
kinetics 10 times slower than for K+ currents in
olfactory neurons. The Ca2+ current is composed
of at least two components: an L-type current and a T-type current that
activates at 60 mV and is not found in olfactory neurons. We find no
evidence for cyclic nucleotide-gated channels in VNO neurons under a
variety of experimental conditions, including those that produced large
responses in mouse olfactory neurons, which is further evidence for a
novel transduction pathway.
Key words:
mouse;
olfactory;
vomeronasal;
sensory
transduction;
patch-clamp;
voltage-gated channel;
cyclic
nucleotide-gated channel
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