Enhancing excitatory projections from the ventral subiculum to the nucleus accumbens shell contribute to the MK-801-induced impairment of prepulse inhibition. (13th July 2020)

• Record Type: Journal Article
• Authors: Xue, Cheng; Li, Xiao-Hui; Liu, Meng-Qi; Yang, Xing-Cheng; Li, Guo-Hai; Xu, Ru-Jing; Wang, Jia; Zhang, Wei-Ning
• Is Part Of: Neuroscience letters. Volume 731(2020)
• Publication Date: 2020-07-13
• Subjects: Prepulse inhibition (PPI) -- Ventral subiculum (vSub) -- Cholera toxin subunit B (CTB) -- Nucleus accumbens (NAC) -- MK-801; Neurology -- Periodicals; Neurology -- Periodicals; Research -- Periodicals; Neurologie -- Périodiques; Neuroanatomie -- Périodiques; Neuropharmacologie -- Périodiques; Neurophysiologie -- Périodiques; Neurology; Periodicals; Electronic journals; 617.48
• DOI: 10.1016/j.neulet.2020.135024
• Languages: English
• ISSNs: 0304-3940

Abstract

Highlights: Increase neuronal activity in vSub while constant in dSub during PPI disruption. Inhibition of the hyperexcitable vSub ameliorates PPI impairment. Enhanced excitatory projections from the vSub to NAC shell drive the PPI deficiency. Abstract: Prepulse inhibition (PPI), a measure of sensorimotor gating, has been shown to be disrupted in several animal models of neuropsychiatric disorders, such as schizophrenia. The neural circuits involving the hippocampus and nucleus accumbens (NAC) have been studied in rats to uncover the neurochemical and neuroanatomical substrates that regulate PPI. Majority of the studies of the hippocampus on PPI to date have been focused on CA1, CA2, and dentate gyrus (DG) area. Little is known about the role of the subiculum, which maintains the hippocampal formation intact, on the sensorimotor gating. In this study, the PPI disruption was induced by intraperitoneal injection of MK-801 in rats, and the neuronal activity in the dorsal and ventral subiculum by c-Fos immunostaining was examined. The projections from the subiculum to the nucleus accumbens (NAC) were detected by retrograde tracing of cholera toxin B subunit, in the PPI dysfunctional animals. The results showed an increase in neuronal activity in the ventral subiculum (vSub) while remaining constant in the dorsal subiculum during PPI disruption. The excitatory projections from the vSub to the NAC shell were significantly enhanced when PPI was disrupted. Muscimol Inhibition of vSub could significantly ameliorate the MK801-induced PPI deficit. This data suggests that the enhancement of neuronal activity in the vSub was associated with the PPI impairment, possibly due to the enhanced excitatory output from vSub the NAC shell.