Abstract:
:Current and voltage responses elicited by increasing or decreasing the concentration of L-glutamate or its analog kainate around isolated cone horizontal cells were measured with patch pipettes using the whole cell recording configuration. Application of these photoreceptor transmitter agonists induced inward currents in voltage-clamp experiments (for negative holding potentials) and depolarizing responses in current-clamp experiments. Continuous exposure to either drug produced inward currents which were maintained for as long as superfusion with the drugs continued. Reducing the concentration of the agonists by pressure ejection of pulses of drug-free Ringer's solution onto the cells completely turned off the drug-induced currents. Under current-clamp conditions, pulses of control Ringer's elicited hyperpolarizing responses of large amplitude (40-80 mV). The data demonstrate the ability to simulate in vitro the horizontal cell's photoresponses and thus support the use of cultured cells as a model system for studying horizontal cell physiology and pharmacology.
journal_name
Brain Resjournal_title
Brain researchauthors
Perlman I,Knapp AG,Dowling JEdoi
10.1016/0006-8993(89)90935-9subject
Has Abstractpub_date
1989-05-15 00:00:00pages
16-25issue
1eissn
0006-8993issn
1872-6240pii
0006-8993(89)90935-9journal_volume
487pub_type
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