Danegaptide Enhances Astrocyte Gap Junctional Coupling and Reduces Ischemic Reperfusion Brain Injury in Mice

Area of Science:

• Neuroscience
• Pharmacology
• Cell Biology

Background:

• Ischemic stroke causes significant neuronal death due to arterial occlusion.
• Astrocytic connexin43 (Cx43) gap junctions influence neuronal survival during ischemia.
• Targeting Cx43 offers a potential therapeutic strategy for stroke treatment.

Purpose of the Study:

• To investigate the therapeutic potential of danegaptide (ZP1609), a Cx43 gap junction enhancer, in rodent stroke models.
• To assess danegaptide's effects on astrocytic coupling and brain infarct volume post-ischemia.

Main Methods:

• In vitro assessment of danegaptide's effects on Cx43 gap junction and hemichannel activity.
• Matrix-assisted laser desorption ionization imaging mass spectrometry (MALDI IMS) to confirm danegaptide brain penetration.
• Evaluation of danegaptide's efficacy in reducing infarct volume in mouse and rodent stroke models.

Main Results:

• Danegaptide enhanced astrocytic Cx43 coupling in vitro without affecting hemichannel activity.
• MALDI IMS confirmed danegaptide's presence in brain tissue after reperfusion, indicating blood-brain barrier crossing.
• Danegaptide administration significantly reduced infarct volume in a mouse ischemia/reperfusion model.

Conclusions:

• Danegaptide effectively enhances astrocytic connexin43 coupling.
• The dipeptide successfully crosses the blood-brain barrier and reduces ischemic stroke damage.
• Danegaptide demonstrates significant therapeutic potential for treating ischemia/reperfusion stroke.