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Physiological Reviews, Vol. 82, No. 4, October 2002, pp. 875-891; 10.1152/physrev.00010.2002.
Copyright ©2002 by the American Physiological Society
Department of Neurobiology, Pharmacology, and Physiology, University of Chicago, Chicago, Illinois
Schwartz, E. A.
Transport-Mediated Synapses in the Retina. Physiol. Rev. 82: 875-891, 2002.
Most synapses rely on regulated exocytosis
for determining the concentration of transmitter in the synaptic cleft.
However, this mechanism may not be universal. Several synapses in the
retina appear to use a synaptic machinery in which transmitter
transporters play an essential role. Two types of
transport-mediated synapses have been proposed. These synapses have
been best observed in horizontal cells and cones of nonmammalian
retinas. Horizontal cells use a transporter to mediate a bidirectional
shuttle, whose balance point is set by ion concentrations and voltage.
Nonmammalian cones combine exocytosis and the activity of a
transporter. Because exocytosis is voltage independent over most of a
cone's physiological voltage range, a voltage-dependent
transporter determines the concentration of transmitter in the synaptic
cleft. These two synapses may be models for transport-mediated
synapses that operate in other parts of the brain.
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