The Center's Central Hypothesis posits that layer 3 pyramidal cells (PCs) in subjects with schizophrenia have a cell type-autonomous pathology that is refiected in altered somatodendritic morphology and that differs in severity across regions in the cortical visual working memory and attention network. These abnormalities of layer 3 PCs result in locally reduced excitatory drive, refiected in reduced markers of metabolic activity in layer 3 PCs and reduced activity-dependent markers in reciprocally-connected layer 3 parvalbumin (PV)-expressing basket cells. This model leads to several novel predicfions. For example, that deflcits in layer 3 PC somal volume and dendritic spine density are present in mulfiple cortical regions, but moderated by region-specific factors (Aim 1). To date only limited analyses of primary visual cortex (VI) have been conducted, and the posterior parietal cortex (PPC) has not been examined. Our preliminary data indicate that impairments in dorsolateral prefrontal cortex (DLPFC) are associated with reduced markers of local network activity within PCs and PV basket cells. Functional data indicate impaired activity within VI and PPC during visual tasks in subjects with schizophrenia. Thus, our model predicts that markers of neuronal acfivity are also altered within VI and PPC (Aim 2). Finally, reducfions in pre-synapfic proteins such as synaptophysin and synapsini, that are known to impair glutamatergic bouton funcfion, behavior, and cognifion, have been previously observed in schizophrenia. Our model predicts that reductions in these proteins predominate in intracortical glutamatergic boutons within layer 3 across V1-PPC-DLPFC and are posifively correlated with the magnitude of the underlying somatodendrific abnormalifies within regions in the network (Aim 3). This project serves as an essenfial link between disease-related molecular findings in these same neurons, layers and regions (Project 1) and abnormal information processing in disease (Project 5). This project will constrain the interpretation of how normative functional connectivity (Projects 4 &5) is altered in disease (Project 5) and will guide predicfions for future studies using markers specific for projections between PPC and DLPFC that may be identified in Project 3.

Public Health Relevance

Individuals with schizophrenia have impairments in attention and working memory, the ability to retain informafion in mind, which are important determinants of day-to-day funcfion. This project will determine if individuals with schizophrenia have impairments in the neuronal structures in three key brain regions that form the circuits responsible for attention and working memory.

National Institute of Health (NIH)
National Institute of Mental Health (NIMH)
Specialized Center (P50)
Project #
Application #
Study Section
Special Emphasis Panel (ZMH1-ERB-L (01))
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
University of Pittsburgh
United States
Zip Code
Asafu-Adjei, Josephine K; Sampson, Allan R (2018) Covariate adjusted classification trees. Biostatistics 19:42-53
Chung, Daniel W; Chung, Youjin; Bazmi, H Holly et al. (2018) Altered ErbB4 splicing and cortical parvalbumin interneuron dysfunction in schizophrenia and mood disorders. Neuropsychopharmacology 43:2478-2486
Enwright Iii, J F; Huo, Z; Arion, D et al. (2018) Transcriptome alterations of prefrontal cortical parvalbumin neurons in schizophrenia. Mol Psychiatry 23:1606-1613
Huang, Ge; Ramachandran, Suchitra; Lee, Tai Sing et al. (2018) Neural Correlate of Visual Familiarity in Macaque Area V2. J Neurosci 38:8967-8975
Coffman, Brian A; Haigh, Sarah M; Murphy, Timothy K et al. (2018) Reduced auditory segmentation potentials in first-episode schizophrenia. Schizophr Res 195:421-427
Pafundo, Diego E; Miyamae, Takeaki; Lewis, David A et al. (2018) Presynaptic Effects of N-Methyl-D-Aspartate Receptors Enhance Parvalbumin Cell-Mediated Inhibition of Pyramidal Cells in Mouse Prefrontal Cortex. Biol Psychiatry 84:460-470
Hoftman, Gil D; Dienel, Samuel J; Bazmi, Holly H et al. (2018) Altered Gradients of Glutamate and Gamma-Aminobutyric Acid Transcripts in the Cortical Visuospatial Working Memory Network in Schizophrenia. Biol Psychiatry 83:670-679
Dorph-Petersen, Karl-Anton; Lewis, David A (2017) Postmortem structural studies of the thalamus in schizophrenia. Schizophr Res 180:28-35
Glausier, Jill R; Lewis, David A (2017) GABA and schizophrenia: Where we stand and where we need to go. Schizophr Res 181:2-3
Rocco, Brad R; DeDionisio, Adam M; Lewis, David A et al. (2017) Alterations in a Unique Class of Cortical Chandelier Cell Axon Cartridges in Schizophrenia. Biol Psychiatry 82:40-48

Showing the most recent 10 out of 36 publications