ArticlebioRxiv : the preprint server for biology2024
Chemogenetic control of GABAergic activity within the interpeduncular nucleus reveals dissociable behavioral components of the nicotine withdrawal phenotype.
Article in bioRxiv : the preprint server for biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Chronic exposure to nicotine results in the development of a dependent state such that a withdrawal syndrome is elicited upon cessation of nicotine. The habenulo-interpeduncular (Hb-IPN) circuit contains a high concentration of nAChRs and has been identified as a main circuit involved in nicotine withdrawal. Here we investigated the contribution of two distinct subpopulations of IPN GABAergic neurons to nicotine withdrawal behaviors. Using a chemogenetic approach to specifically target Amigo1-expressing or Epyc-expressing neurons within the IPN, we found that activity of the Amigo1 and not the Epyc subpopulation of GABAergic neurons is critical for anxiety-like behaviors both in naïve mice and in those undergoing nicotine withdrawal. Moreover, data revealed that stimulation of Amigo1 neurons in nicotine-naïve mice elicits opposite effects on affective and somatic signs of withdrawal. Taken together, these results suggest that somatic and affective behaviors constitute dissociable components of the nicotine withdrawal phenotype and are likely supported by distinct subpopulations of neurons within the IPN.
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