Clozapine reverses dysfunction of glutamatergic neurons derived from clozapine-responsive schizophrenia patients
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ABSTRACT:
PROVIDER: PRJEB50039 | ENA |
REPOSITORIES: ENA
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Project description:Clozapine is an atypical antipsychotic drug used to treat treatment-resistant schizophrenia. Its side effects, including liver enzyme abnormalities, experienced by many patients preclude its more common use as a first-line therapy for schizophrenia. Toxicoproteomic approaches have been demonstrated to effectively guide the identification of toxicological mechanisms. Here, to further our understanding of the molecular effects of clozapine, we performed a data-independent acquisition (DIA)-based quantitative proteomics investigation of clozapine-treated human liver spheroid cultures. In total, we quantified 4,479 proteins across the five treatment groups (vehicle; 15 µM, 30 µM, and 60 µM clozapine; and 10 ng/mL TNFα + IL-1β). Clozapine (60 µM) treatment yielded 36 differentially expressed proteins (FDR < 0.05). Gene-set enrichment analysis indicated perturbation of several gene sets, including interferon gamma signaling (e.g., interferon gamma receptor 1) and prominent autophagy-related processes (e.g., upregulation of sequestosome-1 (SQSTM1), MAP1LC3B/LC3B2, GABARAPL2, and nuclear receptor coactivator 4). The effects of clozapine on autophagy were confirmed by targeted mass spectrometry and western blotting using conventional SQSTM1 and LC3B markers. Combined with prior literature, our work suggests a broad contribution of autophagy to both the therapeutic and side effects of clozapine. Overall, this study demonstrates how proteomics can contribute to the elucidation of physiological and toxicological mechanisms of drugs.
2022-12-13 | PXD038007 | Pride
Project description:Clozapine is an atypical antipsychotic drug for treatment-resistant schizophrenia. Its side effects, including liver enzyme abnormalities, experienced by many patients preclude a more common use as a first-line therapy of schizophrenia. Toxicoproteomics approaches have been demonstrated to effectively guide the identification of toxicological mechanisms. Here, to further our understanding of Clozapine's molecular effects we performed a Data-independent Acquisition (DIA)-based quantitative proteomics investigation of Clozapine-treated human liver spheroid cultures. In total, we quantified 4,479 proteins across five treatment groups (vehicle, 15 µM, 30 µM, 60 µM Clozapine, and 10 ng/mL TNFa + IL-1a). 60 µM Clozapine treatment yielded 36 differentially expressed proteins (fdr < 0.05). Gene-set enrichment analysis indicated perturbation of several gene-sets, which included interferon gamma signaling (e.g., IFNGR1) and prominently autophagy related processes (e.g., upregulation of SQSTM1, MAP1LC3B/LC3B2, GABARAPL2, and NCOA4). Clozapine's effects on autophagy were confirmed using conventional SQSTM1 and LC3B markers by targeted mass-spectrometry and Western Blot.
2022-12-09 | PXD034257 | Pride
Project description:The epigenome of human brain cells encompasses key information in understanding brain function in both healthy and diseased states. To further explore this, we used ATAC-seq to profile chromatin structure in four distinct populations of cells (glutamatergic neurons, GABAergic neurons, oligodendrocytes, and microglia/astrocytes), from three different regions of the brain. Chromatin accessibility was found to vary vastly by cell type and, more moderately, by brain region, with glutamatergic neurons showing the greatest regional variability. Transcription factor footprinting pointed to cell-specific transcriptional regulators and inferred cell-specific regulation of protein coding genes, long intergenic noncoding RNAs, and microRNAs. In vivo transgenic mouse experiments validated the cell type specificity of a number of human-derived regulatory sequences. Open chromatin regions in glutamatergic neurons were enriched for neuropsychiatric risk variants, particularly those associated with schizophrenia. Combining differential chromatin accessibility analysis using ATAC-seq data from bulk tissue increased our statistical power to confirm glutamatergic neurons as the cell type most affected in schizophrenia. Jointly, these findings illustrate the utility of studying the cell type specific epigenome in complex tissues such as the human brain and implicate an association among chromatin accessibility in glutamatergic neurons and genetic risk for schizophrenia.
2020-08-20 | GSE143666 | GEO
Project description:Although antipsychotics are routinely used in the treatment of schizophrenia for last decades, their precise mechanism of action is still unclear. In this study we investigated changes in PC12 cells’ proteome under the influence of clozapine, risperidone and haloperidol to identify protein pathways regulated by the antipsychotics. Analysis of the protein profiles in two time points: after 12 and 24 h of incubation with drugs revealed significant alterations in 510 proteins. Further canonical pathway analysis determined signal transduction pathways and biological processes regulatednby drug treatment. Interestingly, all tested drugs have caused changes in PC12 proteome which correspond to inhibition of cytokines: tumor necrosis factor (TNF) and transforming growth factor beta 1 (TGF-β1), what can be linked to the immunological and viral hypothesis of schizophrenia. We found, that the 12-hour incubation with clozapine caused up-regulation of protein kinase A signalling and translation machinery. After 24 h of treatment with clozapine, the inhibition of the actin cytoskeleton signalling and Rho proteins signalling was revealed. Obtained results suggests that mammalian target of rapamycin complex 1 (mTORC1) and 2 (mTORC2) play a central role in the signal transduction of clozapine.
2021-09-08 | PXD014422 | Pride
Project description:We report changes in gene expression in schizophrenia developmental glutamatergic neurons by genome-wide transcriptome analysis.
2022-12-31 | GSE184102 | GEO
Project description:Schizophrenia is a complex and severe neuropsychiatric disorder, with a wide range of debilitating symptoms. Several aspects of its multifactorial complexity are still unknown, and some are accepted to be an early developmental deficiency with a more specifically neurodevelopmental origin. Understanding timepoints of disturbances during neural cell differentiation processes could lead to an insight into the development of the disorder. In this context, human brain organoids and neural cells differentiated from patient-derived induced pluripotent stem cells are of great interest as a model to study the developmental origins of the disease. Here we evaluated the differential expression of proteins of schizophrenia patient-derived neural progenitors, early neurons, and brain organoids. Using bottom-up shotgun proteomics with a label-free approach for quantitative analysis. Multiple dysregulated proteins were found in pathways related to synapses, in line with postmortem tissue studies of schizophrenia patients. However, organoids and immature neurons exhibit impairments in pathways never before found in patient-derived induced pluripotent stem cell studies, such as spliceosomes and amino acid metabolism. In conclusion, here we provide comprehensive, large-scale, protein-level data that may uncover underlying mechanisms of the developmental origins of schizophrenia.
2023-03-11 | PXD026593 | Pride
Project description:Genome-wide DNA methylation profile of peripheral blood leukocyte samples taken from patients under clozapine treatment. The Infinium MethylationEPIC BeadChip was analyzed to obtain DNA methylation profiles in samples from 31 patients with psychotic disorders under treatment with clozapine and 56 patients with psychiatric disorders naïve to psychopharmacological treatment
2022-02-24 | GSE197136 | GEO
Project description:While the pathophysiology of schizophrenia has been extensively investigated using homogenized postmortem brain samples, few studies have examined changes in brain samples with techniques that may attribute perturbations to specific cell types. To fill this gap, we performed microarray assays on mRNA isolated from anterior cingulate cortex (ACC) superficial and deep pyramidal neurons from 12 schizophrenia and 12 control subjects using laser capture microdissection. Among all the annotated genes, we identified 134 significantly increased and 130 decreased genes in superficial pyramidal neurons, while 93 significantly increased and 101 decreased genes were found in deep pyramidal neurons, in schizophrenia compared to control subjects. In these differentially expressed genes, we detected lamina-specific changes of 55 and 31 genes in superficial and deep neurons in schizophrenia, respectively. Gene set enrichment analysis (GSEA) was applied to the entire pre-ranked differential expression gene lists to gain a complete pathway analysis throughout all annotated genes. Our analysis revealed over-represented groups of gene sets in schizophrenia, particularly in immunity and synapse related pathways in pyramidal neurons, suggesting the disruption of these pathways plays an important role in schizophrenia. We also detected other pathways previously demonstrated in schizophrenia pathophysiology, including cytokine and chemotaxis, post-synaptic signaling, and glutamatergic synapses. In addition, we observed several novel pathways, including ubiquitin-independent protein catabolic process. We also used a bioinformatics approach to compare our differential expression gene profiles with 51 antipsychotic treatment datasets, demonstrating that our results were not influenced by antipsychotic treatment. Taken together, we found pyramidal neuron-specific changes in neuronal immunity, synaptic dysfunction, and olfactory dysregulation in schizophrenia, providing new insights for the cell-subtype specific pathophysiology of chronic schizophrenia.
2020-02-20 | GSE145554 | GEO
Project description:Genome binding/occupancy profiling was carried out by high throughput sequencing in human developmental cortical interneurons and developmental glutamatergic neurons derived from healthy control vs schizophrenia iPSCs
2022-12-21 | GSE184165 | GEO
Project description:This SuperSeries is composed of the following subset Series:; GSE6467: Twelve weeks expression data of the antipsychotics Clozapine and Haloperidol in the mouse brain (Affymetrix, GCRMA). GSE6511: Four weeks expression data of the antipsychotics Clozapine and Haloperidol in the mouse brain (Affymetrix, GCRMA). Experiment Overall Design: Refer to individual Series
2008-06-14 | E-GEOD-6512 | biostudies-arrayexpress