The functional networks of prepulse inhibition

• Verfasst von: Rohleder, Cathrin [VerfasserIn]
• Verfasst von: Leweke, F. Markus [VerfasserIn]
• Titel: The functional networks of prepulse inhibition
• Titelzusatz: neuronal connectivity analysis based on FDG-PET in awake and unrestrained rats
• Verf.angabe: Cathrin Rohleder, Dirk Wiedermann, Bernd Neumaier, Alexander Drzezga, Lars Timmermann, Rudolf Graf, F. Markus Leweke and Heike Endepols
• E-Jahr: 2016
• Jahr: 21 July 2016
• Umfang: 10 S.
• Fussnoten: Gesehen am 09.07.2019
• Titel Quelle: Enthalten in: Frontiers in behavioral neuroscience
• Ort Quelle: Lausanne : Frontiers Research Foundation, 2007
• Jahr Quelle: 2016
• Band/Heft Quelle: 10(2016) Artikel-Nummer 148, 10 Seiten
• ISSN Quelle: 1662-5153
• DOI: doi:10.3389/fnbeh.2016.00148
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Behavioral PET
• Sach-SW: cerebral glucose consumption
• Sach-SW: Metabolic connectivity
• Sach-SW: PPI modulation
• Sach-SW: PPI Network
• K10plus-PPN: 1668815389

Abstract

Prepulse inhibition (PPI) is a neuropsychological process during which a weak sensory stimulus (“prepulse”) attenuates the motor response (“startle reaction”) to a subsequent strong startling stimulus. It is measured as a surrogate marker of sensorimotor gating in patients suffering from neuropsychological diseases such as schizophrenia, as well as in corresponding animal models. A variety of studies has shown that PPI of the acoustical startle reaction comprises three brain circuitries for: i) startle mediation, ii) PPI mediation and iii) modulation of PPI mediation. While anatomical connections and information flow in the startle and PPI mediation pathways are well known, spatial and temporal interactions of the numerous regions involved in PPI modulation are incompletely understood. We therefore combined [18F]fluoro-2-deoxyglucose positron-emission-tomography (FDG-PET) with PPI and resting state control paradigms in awake rats. A battery of subtractive, correlative as well as seed-based functional connectivity analyses revealed a default mode-like network (DMN) active during resting state only. Furthermore, two functional networks were observed during PPI: Metabolic activity in the lateral circuitry was positively correlated with PPI effectiveness and involved the auditory system and emotional regions. The medial network was negatively correlated with PPI effectiveness, i.e. associated with startle, and recruited a spatial/cognitive network. Our study provides evidence for two distinct neuronal networks, whose continuous interplay determines PPI effectiveness in rats, probably by either protecting the prepulse or facilitating startle processing. Discovering similar networks affected in neuropsychological disorders may help to better understand mechanisms of sensorimotor gating deficits and provide new perspectives for therapeutic strategies.