Thymosin beta 4 attenuates PrP(106-126)-induced human brain endothelial cells dysfunction

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• The blood-brain barrier (BBB) is crucial for CNS protection, formed by endothelial cells with tight junctions.
• Prion diseases involve abnormal prion protein (PrP) accumulation, potentially leading to neurodegeneration.
• Thymosin beta 4 (Tβ4) is a neuroprotective peptide, but its role in prion diseases is unknown.

Purpose of the Study:

• To investigate the effect of Tβ4 on prion-induced BBB dysfunction in a human cerebral endothelial cell model.
• To determine if Tβ4 can mitigate the detrimental effects of PrP on BBB integrity.

Main Methods:

• Utilized hCMEC/D3 human cerebral endothelial cells to model the BBB.
• Administered PrP (106-126) fragment to induce BBB dysfunction.
• Assessed the impact of Tβ4 on tight junction proteins, actin dynamics (F-actin/G-actin ratio), and vascular permeability.

Main Results:

• Tβ4 increased tight junction protein expression in endothelial cells.
• Tβ4 reduced the F-actin to G-actin ratio, indicating altered actin dynamics.
• Tβ4 significantly improved vascular permeability dysfunction induced by PrP (106-126).
• PrP (106-126) was shown to disrupt tight junctions and cytoskeleton arrangement.

Conclusions:

• Tβ4 demonstrates a barrier-stabilizing role in the context of prion-induced BBB dysfunction.
• Tβ4 may offer a therapeutic strategy to prevent neurodegenerative diseases associated with prion pathology and BBB breakdown.