Protective Effect of Protocatechuic Aldehyde on Cerebral Ischemia/Reperfusion Injury in Rats through Blood-Brain...

Area of Science:

• Neuroscience
• Pharmacology
• Biochemistry

Background:

• Cerebral ischemia causes blood-brain barrier (BBB) destruction, leading to edema and infarction, impacting treatment efficacy.
• Damage to the BBB is a critical factor in stroke outcomes and therapeutic success.

Purpose of the Study:

• To investigate the protective effects of protocatechuic aldehyde (PAL) on BBB structure and function following middle cerebral artery occlusion/reperfusion (MCAO/R) in a rat model.
• To assess PAL's impact on neurological deficits, infarct volume, and BBB integrity markers.

Main Methods:

• Rats underwent MCAO/R after 5-day pretreatment with PAL (10 and 20 mg/kg).
• Evaluated infarct volume, neurological scores, Evans blue extravasation, nitric oxide (NO) levels, NO synthase activities, and expression of AQP-4, occludin, claudin-5, and MMP-3.
• Analyzed BBB ultrastructure using electron microscopy.

Main Results:

• PAL significantly reduced neurological deficit scores, infarct volume, and Evans blue extravasation.
• Electron microscopy confirmed PAL's improvement of BBB ultrastructure and alleviation of injury.
• PAL increased occludin and claudin-5 expression, while decreasing AQP-4 and MMP-3.
• NO release and NO synthase activities were significantly inhibited by PAL.

Conclusions:

• Protocatechuic aldehyde demonstrates significant neuroprotective effects against cerebral ischemia/reperfusion injury.
• PAL attenuates BBB damage by enhancing tight junction proteins and reducing vascular permeability.
• PAL's ability to protect the BBB makes it a promising therapeutic candidate for stroke treatment.