Characterizing stroke-related cellular changes in the surviving neurons of mouse ischemic stroke

Area of Science:

• Neuroscience
• Molecular Biology
• Genomics

Background:

• Ischemic stroke necessitates rapid restoration of cerebral blood flow to minimize neuronal damage.
• Understanding cellular and molecular changes post-stroke is crucial for developing effective treatments.

Purpose of the Study:

• To characterize cellular and molecular alterations in the acute and subacute phases following distal middle cerebral artery occlusion (dMCAO) in mice.
• To identify novel therapeutic targets within the penumbra region.

Main Methods:

• Employed single-nucleus RNA sequencing (snRNA-seq) and single-cell RNA sequencing (scRNA-seq) on mouse models of dMCAO.
• Utilized immunohistochemistry to validate sequencing findings.
• Investigated the role of the cAMP response element-binding (CREB) pathway using viral vectors.

Main Results:

• Identified dynamic shifts in microglia from homeostatic to disease-associated states.
• Observed a decline in glutamatergic neurons and an increase in endothelial cells post-stroke.
• Highlighted the involvement of neuronal death, autophagy, and cAMP biosynthesis pathways, with elevated Syngap1, Ikbkb, and Rock1 expression.
• Confirmed activation of the Syngap1 and CREB pathways, with CREB suppression reducing neuronal survival.

Conclusions:

• Single-nucleus RNA sequencing provides a detailed map of cellular responses to ischemic stroke.
• Autophagy and cAMP pathways in the penumbra are promising therapeutic targets for stroke treatment.
• The CREB pathway plays a critical role in neuroprotection and autophagy following ischemic injury.