Sensory and Sensorimotor Gating Deficits after Neonatal Ventral Hippocampal Lesions in Rats

Neonatal ventral hippocampal lesions (NVHLs) in rats lead to reduced prepulse inhibition (PPI) of startle and other behavioral deficits in adulthood that model abnormalities in schizophrenia patients. A neurophysiological deficit in schizophrenia patients and their first-degree relatives is reduced...

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Veröffentlicht in:Developmental neuroscience 2012-09, Vol.34 (2-3), p.240-249
Hauptverfasser: Swerdlow, Neal R., Light, Gregory A., Breier, Michelle R., Shoemaker, Jody M., Saint Marie, Richard L., Neary, Alaina C., Geyer, Mark A., Stevens, Karen E., Powell, Susan B.
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container_end_page 249
container_issue 2-3
container_start_page 240
container_title Developmental neuroscience
container_volume 34
creator Swerdlow, Neal R.
Light, Gregory A.
Breier, Michelle R.
Shoemaker, Jody M.
Saint Marie, Richard L.
Neary, Alaina C.
Geyer, Mark A.
Stevens, Karen E.
Powell, Susan B.
description Neonatal ventral hippocampal lesions (NVHLs) in rats lead to reduced prepulse inhibition (PPI) of startle and other behavioral deficits in adulthood that model abnormalities in schizophrenia patients. A neurophysiological deficit in schizophrenia patients and their first-degree relatives is reduced gating of the P50 event-related potential (ERP). N40 ERP gating in rats may be a cross-species analog of P50 gating, and is disrupted in experimental manipulations related to schizophrenia. Here, we tested whether N40 gating as well as PPI is disrupted after NVHLs, using contemporaneous measures of these two conceptually related phenomena. Male rat pups received sham or ibotenic acid NVHLs on postnatal day 7. PPI was tested on days 35 and 56, after which rats were equipped with cortical surface electrodes for ERP measurements. One week later, PPI and N40 gating were measured in a single test, using paired S1-S2 clicks spaced 500 ms apart to elicit N40 gating. Compared to sham-lesioned rats, those with NVHLs exhibited PPI deficits on days 35 and 56. NVHL rats also exhibited reduced N40 gating and reduced PPI, when measured contemporaneously at day 65. Deficits in PPI and N40 gating appeared most pronounced in rats with larger lesions, focused within the ventral hippocampus. In this first report of contemporaneous measures of two important schizophrenia-related phenotypes in NVHL rats, NVHLs reproduce both sensory (N40) and sensorimotor (PPI) gating deficits exhibited in schizophrenia. In this study, lesion effects were detected prior to pubertal onset, and were sustained well into adulthood.
doi_str_mv 10.1159/000336841
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A neurophysiological deficit in schizophrenia patients and their first-degree relatives is reduced gating of the P50 event-related potential (ERP). N40 ERP gating in rats may be a cross-species analog of P50 gating, and is disrupted in experimental manipulations related to schizophrenia. Here, we tested whether N40 gating as well as PPI is disrupted after NVHLs, using contemporaneous measures of these two conceptually related phenomena. Male rat pups received sham or ibotenic acid NVHLs on postnatal day 7. PPI was tested on days 35 and 56, after which rats were equipped with cortical surface electrodes for ERP measurements. One week later, PPI and N40 gating were measured in a single test, using paired S1-S2 clicks spaced 500 ms apart to elicit N40 gating. Compared to sham-lesioned rats, those with NVHLs exhibited PPI deficits on days 35 and 56. NVHL rats also exhibited reduced N40 gating and reduced PPI, when measured contemporaneously at day 65. Deficits in PPI and N40 gating appeared most pronounced in rats with larger lesions, focused within the ventral hippocampus. In this first report of contemporaneous measures of two important schizophrenia-related phenotypes in NVHL rats, NVHLs reproduce both sensory (N40) and sensorimotor (PPI) gating deficits exhibited in schizophrenia. In this study, lesion effects were detected prior to pubertal onset, and were sustained well into adulthood.</abstract><cop>Basel, Switzerland</cop><pub>S. Karger AG</pub><pmid>22572564</pmid><doi>10.1159/000336841</doi><tpages>10</tpages></addata></record>
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subjects Acoustic Stimulation
Animal models
Animals
Animals, Newborn
Brain Injuries - physiopathology
Electrodes
Event-related potentials
Gating
Hippocampus
Hippocampus - drug effects
Hippocampus - injuries
Hippocampus - physiopathology
Ibotenic acid
Ibotenic Acid - pharmacology
Male
Mental disorders
Neonates
Nervous system
Rats
Rats, Sprague-Dawley
Reflex, Startle - drug effects
Reflex, Startle - physiology
Schizophrenia
Sensorimotor gating
Sensory Gating - drug effects
Sensory Gating - physiology
title Sensory and Sensorimotor Gating Deficits after Neonatal Ventral Hippocampal Lesions in Rats
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