Volume 17, Number 10,
Issue of May 15, 1997
pp. 3392-3400
Copyright ©1997 Society for Neuroscience
Partition of Transient and Sustained Inhibitory Glycinergic Input
to Retinal Ganglion Cells
Received Dec. 23, 1996; accepted Feb. 24, 1997.
Yi Han,
Jian Zhang, and
Malcolm M. Slaughter
Departments of Physiology, Biophysical Sciences, and Ophthalmology,
School of Medicine, State University of New York, Buffalo, New York
14214
Physiological and pharmacological properties of possible subtypes
of the native glycine receptor were investigated in retinal neurons
using whole-cell voltage-clamp techniques. Two discrete inhibitory
glycine responses were identified in ganglion cells. The responses
could be distinguished pharmacologically: one was sensitive to
strychnine and the other to 5,7-dichlorokynurenic acid. The two
responses had different kinetics: the former had a fast onset and fast
desensitization, whereas the latter had a slower onset and was much
more sustained. The physiological and pharmacological distinctions
suggest that the responses are mediated by different receptors. These
receptors transduce glycinergic synaptic signals to ganglion cells,
where they serve as low- and high-pass filters, respectively, of
EPSPs.
Key words:
glycine receptors;
inhibition;
strychnine;
5,7-dichlorokynurenic acid;
ganglion cells;
retina