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Both the neuregulin 1 (Nrg1) and alpha7 nicotinic acetylcholine receptor (alpha7*nAChRs) genes have been linked to schizophrenia and associated sensory-motor gating deficits. The prominence of nicotine addiction in schizophrenic patients is reflected in the normalization of gating deficits by nicotine self-administration. To assess the role of presynaptic type III Nrg1 at hippocampal-accumbens synapses, an important relay in sensory-motor gating, we developed a specialized preparation of chimeric circuits in vitro. Synaptic relays from Nrg1(tm1Lwr) heterozygote ventral hippocampal slices to wild-type (WT) nucleus accumbens neurons (1) lack a sustained, alpha7*nAChRs-mediated phase of synaptic potentiation seen in comparable WT/WT circuits and (2) are deficient in targeting alpha7*nAChRs to presynaptic sites. Thus, selective alteration of the level of presynaptic type III Nrg1 dramatically affects the modulation of glutamatergic transmission at ventral hippocampal to nucleus accumbens synapses.

the journal of neuroscience/the journal of neuroscience

Presynaptic Type III Neuregulin 1 Is Required for Sustained Enhancement of Hippocampal Transmission by Nicotine and for Axonal Targeting of α7 Nicotinic Acetylcholine Receptors