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Proceedings: The actions of GABA on d.c. and field potential recordings from the rat cuneate nucleus.

GABA is thought to be a presynaptic inhibitory transmitter in mammals largely because the GABA antagonists picrotoxin and bicuculline block presynaptic inhibition (Eccles, Schmidt & Willis, 1963; Levy, Repkin & Anderson, 1971). The present experiments are an attempt to demonstrate that exogenous GABA will enhance or mimic presynaptic inhibition, as previous attempts to do this have only been partially successful (Curtis & Ryall, 1966; Schmidt, 1971). Experiments were performed on 20 rats prepared as described previously (Collins, Hill & Roberts, 1975). In addition, d.c. potentials were recorded from a micropipette inserted into the cuneate nucleus. The exposed dorsal surface of the medulla was continuously superfused with a Krebs bicarbonate solution to which solutions of amino acids were added. Changes in the Nand P-waves of the cuneate field potential were measured from computer averaged records. GABA (0.01-0.5 M) in the superfusion solution reduced the size of the N-wave and increased the