Preserving mitochondrial function by inhibiting GRP75 ameliorates neuron injury under ischemic stroke

Area of Science:

• Neuroscience
• Cell Biology
• Pathophysiology

Background:

• Ischemic stroke causes neuron damage, often linked to mitochondrial dysfunction.
• Mitochondrial calcium overload is a key factor in this dysfunction, but its mechanisms remain unclear.
• Understanding these mechanisms is crucial for developing effective stroke treatments.

Purpose of the Study:

• To investigate the role of heat shock protein 75 kDa glucose-regulated protein (GRP75) in mitochondrial dysfunction during ischemic stroke.
• To explore whether GRP75 inhibition can mitigate mitochondrial calcium overload and preserve function.
• To provide evidence for potential therapeutic strategies targeting GRP75 in ischemic diseases.

Main Methods:

• In vivo middle cerebral artery obstruction (MCAO) model in rodents.
• In vitro oxygen and glucose deprivation (OGD) model.
• Assessment of mitochondrial morphology, calcium levels, and overall function.
• Evaluation of GRP75 expression levels.

Main Results:

• Both MCAO and OGD models induced significant mitochondrial dysfunction and fragmentation.
• Hypoxia conditions led to the upregulation of GRP75.
• Inhibition of GRP75 effectively reduced mitochondrial calcium overload.
• GRP75 inhibition preserved mitochondrial function in the context of ischemia.

Conclusions:

• GRP75 plays a critical role in mediating mitochondrial calcium overload and dysfunction in ischemic stroke.
• Targeting GRP75 presents a promising therapeutic avenue for mitigating neuronal damage in ischemic stroke.
• Further translational studies are warranted to explore GRP75 inhibition for clinical applications in stroke treatment.