title: Hippocampal Y2 receptor-mediated mossy fiber plasticity is implicated in nicotine abstinence-related social anxiety-like behavior in an outbred rat model of the novelty-seeking phenotype.
abstract: Experimentally naïve outbred rats display varying rates of locomotor reactivity in response to the mild stress of a novel environment. Namely, some display high rates (HR) whereas some display low rates (LR) of locomotor reactivity. Previous reports from our laboratory show that HRs, but not LRs, develop locomotor sensitization to a low dose nicotine challenge and exhibit increased social anxiety-like behavior following chronic intermittent nicotine training. Moreover, the hippocampus, specifically hippocampal Y2 receptor (Y2R)-mediated neuropeptide Y signaling is implicated in these nicotine-induced behavioral effects observed in HRs. The present study examines the structural substrates of the expression of locomotor sensitization to a low dose nicotine challenge and associated social anxiety-like behavior following chronic intermittent nicotine exposure during adolescence in the LRHR hippocampi. Our data showed that the expression of locomotor sensitization to the low dose nicotine challenge and the increase in social anxiety-like behavior were accompanied by an increase in mossy fiber terminal field size, as well as an increase in spinophilin mRNA levels in the hippocampus in nicotine pre-trained HRs compared to saline pre-trained controls. Furthermore, a novel, selective Y2R antagonist administered systemically during 1 wk of abstinence reversed the behavioral, molecular and neuromorphological effects observed in nicotine-exposed HRs. These results suggest that nicotine-induced neuroplasticity within the hippocampus may regulate abstinence-related negative affect in HRs, and implicate hippocampal Y2R in vulnerability to the behavioral and neuroplastic effects of nicotine in the novelty-seeking phenotype.
authors.affiliation: Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, United States. Electronic address: caydin@umich.edu.
authors.forename: Cigdem
authors.initials: C
authors.lastname: Aydin
authors.affiliation: Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, United States.
authors.forename: Ozge
authors.initials: O
authors.lastname: Oztan
authors.affiliation: Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, United States.
authors.forename: Ceylan
authors.initials: C
authors.lastname: Isgor
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D005106:Exploratory Behavior / Q000187:drug effects*; D006624:Hippocampus / Q000737:chemistry; D008297:Male; D008840:Microfilament Proteins / Q000032:analysis; D019599:Mossy Fibers, Hippocampal / Q000187:drug effects*; D009043:Motor Activity / Q000187:drug effects; D009419:Nerve Tissue Proteins / Q000032:analysis; D009473:Neuronal Plasticity / Q000187:drug effects*; D009538:Nicotine / Q000494:pharmacology*; D010641:Phenotype; D010698:Phobic Disorders / Q000503:physiopathology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017476:Receptors, Neuropeptide Y / Q000187:drug effects* / Q000502:physiology; D000099273:Neurabins
chemical_list: D008840:Microfilament Proteins; D009419:Nerve Tissue Proteins; D009538:Nicotine; D017476:Receptors, Neuropeptide Y; D000099273:Neurabins; C095889:neuropeptide Y2 receptor
keywords: Behavioral sensitization; Hippocampus; Mossy fiber; Neuroplasticity; Social anxiety; Y2 receptor