Andrographolide Improves ApoE4-Mediated Blood-Brain Barrier Injury by Alleviating Inflammation

Area of Science:

• Neuroscience
• Pharmacology
• Biochemistry

Background:

• Alzheimer's disease (AD) is linked to apolipoprotein E4 (ApoE4), which damages the blood-brain barrier (BBB).
• Increased BBB permeability is a key factor in AD development.
• Andrographolide (Andro), from Andrographis paniculata, possesses anti-inflammatory and antioxidant properties with potential neuroprotective effects.

Purpose of the Study:

• To investigate the protective effects and mechanisms of Andro on BBB injury.
• To evaluate Andro's efficacy in both zebrafish and cell co-culture models of BBB damage.

Main Methods:

• Utilized an atorvastatin-mediated zebrafish brain injury model.
• Employed an ApoE4-mediated cell co-culture model of BBB injury.
• Assessed the impact of Andro on signaling pathways and protein expression.

Main Results:

• Andro inhibited the CypA/NF-κB/MMP-9 signaling pathway.
• Andro counteracted ApoE4's inhibitory effects on tight junction proteins (occludin, claudin-5, ZO-1).
• Andro reduced the secretion of cell adhesion molecules (VCAM-1, ICAM-1), mitigating neuroinflammation.

Conclusions:

• Andrographolide demonstrates significant protective effects on the blood-brain barrier.
• Andro's mechanism involves inhibiting inflammatory pathways and maintaining BBB integrity.
• Andro is a promising natural product for protecting the BBB and potentially treating AD.