Circular RNA PTPN4 Contributes to Blood-Brain Barrier Disruption during Early Epileptogenesis.

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Circular RNAs (circRNAs) regulate gene expression and are implicated in brain development and pathology.
• Epilepsy involves complex molecular changes affecting brain function and integrity.

Purpose of the Study:

• To investigate the role of CircPTPN4 in epileptogenesis and blood-brain barrier (BBB) integrity.
• To elucidate the molecular mechanism underlying CircPTPN4's function in epilepsy.

Main Methods:

• Murine temporal lobe epilepsy model.
• Analysis of CircPTPN4 expression in brain tissue and plasma.
• Investigation of CircPTPN4's effect on brain microvascular endothelial cells (BMECs) and BBB integrity.
• Molecular mechanism studies involving RNA sequencing, miRNA analysis, and pathway analysis (p38/MAPK).

Main Results:

• CircPTPN4 expression is elevated in early epileptogenesis.
• CircPTPN4 overexpression disrupts tight junctions in BMECs, impairing BBB integrity.
• CircPTPN4 acts as a molecular sponge for miR-145a-5p, upregulating ECE-1 and subsequently ET-1 production.
• Activation of the p38/MAPK pathway by ET-1 downregulates tight junction proteins.
• Knockdown of CircPTPN4 ameliorates BBB disruption and reduces seizure frequency.

Conclusions:

• The CircPTPN4/miR-145a-5p/ECE-1 axis is a key player in early epileptogenesis and BBB dysfunction.
• CircPTPN4 serves as a potential diagnostic biomarker for early-stage epilepsy.
• Targeting CircPTPN4 offers a therapeutic strategy for preserving BBB integrity and managing epilepsy.