Cholinergic disinhibition in area CA1 of the rat hippocampus is not mediated by receptors located on inhibitory neurons

Abstract

We studied the effects of carbamylcholine (carbachol; CCh) on monosynaptic inhibitory postsynaptic potentials (IPSPs) evoked in the presence of the excitatory amino acid receptor antagonists 6,7-dinitroquinoxaline-2,3-dione (DNQX) and D,L-2-amino-5-phosphonovalerate (APV). CCh (30 μM) blocked late afterhyperpolarizations but did not depress GABA A receptor-mediated fast monosynaptic IPSPs or GABA B receptor-mediated late monosynaptic IPSPs. In the presence of CCh the GABA B receptor agonist ( ± )-baclofen (2 mM) reversibly hyperpolarized pyramidal neurons and depressed monosynaptic IPSPs as under control conditions. Phorbol-12,13-diacetate (PDAc; 10 μM) increased fast and depressed late monosynaptic IPSPs, and prevented depression of IPSPs by baclofen. These results suggest that cholinergic disinhibition in area CA1 of the hippocampus results from decreased synaptic excitation of inhibitory neurons.