Project description:Analysis of the dentate gyrus of traumatic brain injury model. Results provide insight into the molecular mechanism underlying TBI.
Project description:Background: Traumatic brain injury (TBI) often results in diverse molecular responses, challenging traditional proteomic studies that measure average changes at tissue levels and fail to capture the complexity and heterogeneity of the affected tissues. Spatial proteomics offers a solution by providing insights into sub-region-specific alterations within tissues. This study focuses on the hippocampal sub-regions, analyzing proteomic expression profiles in mice at the acute (1 day) and subacute (7 days) phases of post-TBI to understand subregion-specific vulnerabilities and long-term consequences. Methods: Three mice brains were collected from each group including Sham, 1-day post-TBI and 7-day post-TBI. Hippocampal subregions were extracted using Laser Microdissection (LMD); and subsequently analyzed by label-free quantitative proteomics. Results: The spatial analysis reveals region-specific protein abundance changes, highlighting the elevation of FN1, LGALS3BP, HP, and MUG-1 in the stratum moleculare (SM), suggesting potential immune cell enrichment post-TBI. Notably, established markers of chronic traumatic encephalopathy, IGHM and B2M, exhibit specific upregulation in the dentate gyrus bottom (DG2) independent of direct mechanical injury. Metabolic pathway analysis identifies disturbances in glucose and lipid metabolism, coupled with activated cholesterol synthesis pathways enriched in SM at 7-Day post-TBI and subsequently in deeper DG1 and DG2 suggesting a role in neurogenesis and onset of recovery. Coordinated activation of neuroglia and microtubule dynamics in DG2 suggest recovery mechanisms in less affected regions. Cluster analysis revealed spatial variations post-TBI, indicative of dysregulated neuronal plasticity and neurogenesis and further predisposition to neurological disorders. TBI-induced protein upregulation (MUG-1, PZP, GFAP, TJP, STAT-1 and CD44) across hippocampal sub-regions indicates shared molecular responses and links to neurological disorders. Spatial variations were demonstrated by proteins dysregulated in both or either of the time-points exclusively in each subregion (ELAVL2, CLIC1 in PL, CD44 and MUG-1 in SM, and SHOC2, LGALS3 in DG). Conclusions: Utilizing advanced spatial proteomics techniques, the study unveils the dynamic molecular responses in distinct hippocampal subregions post-TBI. It uncovers region-specific vulnerabilities and dysregulated neuronal processes, and potential recovery-related pathways that contribute to our understanding of TBI’s neurological consequences and provides valuable insights for biomarker discovery and therapeutic targets.
Project description:The dentate gyrus of the hippocampus is a brain region involved in learning, memory formation, and spatial coding. We performed single-cell RNA-sequencing of the dentate gyrus of young and old mice to identify the age-induced changes.
Project description:In vivo high frequency stimulated of left dentate gyrus was performed on anaesthetised rats followed by RNA-seq to study long-term potentiation. Both left and right dentate gyrus was collected, sequenced and compared against each other for naive rats and for rats 30 min, 2 hours, and 5 hours post-HFS.
Project description:Analysis of the dentate gyrus of amygdala electrical stimulation model of temporal lobe epilepsy. Results provide insight into the molecular mechanism underlying epileptogenesis.
Project description:The gene expression patterns in the dentate gyrus of wild-type mice during postnatal development were examined using Affymetrix GeneChip arrays.
Project description:This project continues our acute TBI studies and initiates chronic studies -- characterizing the temporal genomic profile of the injured brain up to 12 months post-TBI. Thus, the primary objective of this proposal is to determine the long-term effects of traumatic brain injury on gene expression in the hippocampus and cortex, two brain regions known to be particularly vulnerable to TBI.