EGR2 affects mixed stroke repair through BNIP3L-mediated microglial mitophagy

Area of Science:

• Neuroscience
• Molecular Biology
• Cell Biology

Background:

• Intracerebral hemorrhage (ICH) is a severe type of stroke with limited treatment options.
• The Early Growth Response 2 (EGR2) gene's role in brain diseases is under investigation.
• Understanding the molecular mechanisms of ICH is crucial for developing effective therapies.

Purpose of the Study:

• To investigate the role of EGR2 in microglial response to intracerebral hemorrhage (ICH).
• To explore the potential of EGR2 as a therapeutic target for ICH.
• To elucidate the molecular pathways involved in EGR2-mediated protection against ICH.

Main Methods:

• A cell model of ICH was established using oxyhemoglobin (OxyHb).
• Cell viability, mitochondrial membrane potential, and protein/mRNA expression (EGR2, BNIP3L, LC3, ATG7, P62) were assessed.
• Immunofluorescence and RT-qPCR were used to analyze autophagy and protein levels.

Main Results:

• OxyHb reduced microglial viability and mitochondrial membrane potential.
• Overexpression of EGR2 (oe-EGR2) increased microglial membrane potential and promoted autophagy-related protein expression.
• EGR2 promotes microglial mitophagy by upregulating BNIP3L, which was confirmed by the reversal effects of Mdivi-1 and sh-BNIP3L.

Conclusions:

• EGR2 plays a protective role in ICH by enhancing microglial mitophagy.
• Upregulation of BNIP3L by EGR2 is a key mechanism in mitigating ICH-induced damage.
• Targeting EGR2-mediated mitophagy presents a potential therapeutic strategy for intracerebral hemorrhage.