SHM Converge Scientific Abstract ePoster Gallery-Neuroprotective Effects of Hypoxic Post-Conditioning After Ischemic Stroke

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This study examined whether hypoxic postconditioning (HPC), a brief sublethal hypoxic exposure after ischemic injury, can protect the brain after ischemic stroke by reducing inflammation and promoting white matter repair. Using a mouse middle cerebral artery occlusion (MCAO) model, the researchers exposed animals to hypoxia after ischemia and assessed brain blood flow, neurological function, inflammatory markers, microglial phenotype, and white matter integrity over acute and chronic phases.<br /><br />The results showed that HPC reduced infarct size and lowered pro-inflammatory immune cell infiltration in the early phase after stroke. In particular, it decreased neutrophils and macrophages near the infarct and shifted microglia/macrophages toward an anti-inflammatory, neuroprotective phenotype, with increased CD206 and reduced CD16 expression. HPC also reduced inflammatory cytokines such as eotaxin, MIP-1γ, and TNF RII, which are associated with worse recovery.<br /><br />In the later phase after ischemia, HPC improved white matter integrity. It increased myelin-related markers such as MBP and NF200 and reduced white matter lesions detected by Luxol fast blue staining. HPC also promoted oligodendrocyte progenitor differentiation and maturation, suggesting enhanced remyelination and repair of injured white matter. However, it did not significantly affect axonal injury or oligodendrocyte apoptosis at the examined earlier time point.<br /><br />Overall, the study concludes that HPC provides neuroprotection after ischemic stroke by suppressing inflammation, promoting protective microglial responses, and enhancing oligodendrocyte-driven white matter repair. These findings suggest HPC may be a promising strategy for improving recovery after stroke, especially by targeting white matter injury.

Asset Subtitle

Ho Jun Yun

Meta Tag

Author List Changhong Ren, Ho Jun Yun, Sijie Li, Wantong Yu

Category Research

Concept Ischemic Stroke

Concept White Matter Injury

Concept Hypoxic Post-Conditioning

Concept Microglia

Concept Oligodendrocyte

Distinguished Non-Finalist

Presenter Organization Wayne State University School of Medicine

Presenting Author Ho Jun Yun

Track Translating Research into Practice

Keywords

hypoxic postconditioning

ischemic stroke

inflammation

white matter repair

microglial phenotype

MCAO mouse model

oligodendrocyte progenitor cells

remyelination

neuroprotection

infarct reduction

Ischemic Stroke

White Matter Injury

Hypoxic Post-Conditioning

Microglia

Oligodendrocyte