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1 Dept. of Anatomy and Neurobiology and Program in Neuroscience, Univ. of Maryland School of Medicine, Baltimore, Maryland, United States
* To whom correspondence should be addressed. E-mail: akeller{at}umaryland.edu.
We have previously shown that the GABAergic nucleus zona incerta (ZI) suppresses vibrissae-evoked responses in the posterior medial (POm) thalamus of the rodent somatosensory system. We proposed that this inhibitory incerto-thalamic pathway regulates POm responses during different behavioral states. Here we tested the hypothesis that the cholinergic reticular activating system, implicated in regulating states of arousal, modulates ZI activity. We show that stimulation of brainstem cholinergic nuclei (laterodorsal tegmental and pedunculopontine tegmental) results in suppression of spontaneous firing of ZI neurons. Iontophoretic application of the cholinergic agonist carbachol to ZI neurons suppresses both their spontaneous firing and their vibrissae-evoked responses. We also found that carbachol application to an in vitro slice preparation suppresses spontaneous firing of neurons in the ventral sector of ZI (ZIv). Finally, we demonstrate that the majority of ZIv neurons contain parvalbumin and project to POm. Based on these results, we present the state dependent gating hypothesis, which states that differing behavioral states--regulated by the brainstem cholinergic system--modulate ZI activity, thereby regulating the response properties of higher-order nuclei such as POm.
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