Traumatic Brain Injury Model
Objective: To evaluate structural and functional protection of white matter in a murine model of traumatic brain injury using HDAC inhibition and assess microglia/macrophage polarization
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Protocol Steps
Traumatic Brain Injury Induction
Induce moderate or severe traumatic brain injury in murine subjects to create white matter injury model
Note: Model designed to damage white matter and contribute to long-term neurological deficits
View evidence from paper
“Moderate or severe traumatic brain injury (TBI) damages white matter, thereby contributing to long-term neurological deficits”
HDAC Inhibitor Treatment
Administer Scriptaid to inhibit histone deacetylases and promote white matter protection
Note: Treatment shifts microglia/macrophage polarization toward M2 phenotype
View evidence from paper
“Scriptaid protects white matter up to 35 d after TBI, as shown by reductions in abnormally dephosphorylated neurofilament protein”
Assessment of Neurofilament Phosphorylation
Measure abnormally dephosphorylated neurofilament protein levels as indicator of white matter protection
Note: Reductions in abnormal dephosphorylation indicate protective effects
View evidence from paper
“reductions in abnormally dephosphorylated neurofilament protein, increases in myelin basic protein”
Assessment of Myelin Basic Protein
Measure myelin basic protein levels to assess myelin preservation
Note: Increases in myelin basic protein indicate white matter protection
View evidence from paper
“increases in myelin basic protein, anatomic preservation of myelinated axons, and improved nerve conduction”
Anatomic Assessment of Myelinated Axons
Evaluate anatomic preservation of myelinated axons through histological or imaging analysis
Note: Direct assessment of structural white matter integrity
View evidence from paper
“anatomic preservation of myelinated axons, and improved nerve conduction”
Nerve Conduction Assessment
Measure nerve conduction velocity or function as functional indicator of white matter integrity
Note: Improved nerve conduction indicates functional protection
View evidence from paper
“improved nerve conduction”
Microglia/Macrophage Phenotype Analysis
Assess microglia/macrophage polarization toward M2 phenotype following Scriptaid treatment
Note: M2 phenotype associated with anti-inflammatory effects and white matter protection
View evidence from paper
“Scriptaid shifted microglia/macrophage polarization toward the protective M2 phenotype and mitigated inflammation”
Primary Coculture Studies
Conduct in vitro studies using primary cocultures of microglia and oligodendrocytes to assess mechanism
Note: Scriptaid increases GSK3β expression in microglia, which phosphorylates and inactivates PTEN
View evidence from paper
“In primary cocultures of microglia and oligodendrocytes, Scriptaid increased expression of microglial glycogen synthase kinase 3 beta (GSK3β)”
Assessment of GSK3β/PTEN/PI3K/Akt Signaling
Measure signaling pathway activation including GSK3β upregulation, PTEN phosphorylation, and PI3K/Akt enhancement
Note: GSK3β phosphorylates and inactivates PTEN, enhancing PI3K/Akt signaling
View evidence from paper
“GSK3β, which phosphorylated and inactivated phosphatase and tensin homologue (PTEN), thereby enhancing phosphatidylinositide 3-kinases (PI3K)/Akt signaling”
Oligodendrocyte Preservation Assessment
Evaluate preservation of oligodendrocytes in response to M2-polarized microglia
Note: Increased preservation of neighboring oligodendrocytes associated with microglial M2 phenotype
View evidence from paper
“increased preservation of neighboring oligodendrocytes. These findings are consistent with recent findings that microglial phenotypic switching modulates white matter repair”