Barbiturates decrease the expression of vascular endothelial growth factor in hypoxic cultures of porcine brain...

Area of Science:

• Neuroscience
• Molecular Biology
• Pharmacology

Background:

• Hypoxia increases vascular endothelial growth factor (VEGF) production, enhancing brain microvascular endothelial cell (BMEC) permeability via autocrine signaling.
• Barbiturates, methohexital (MH) and thiopental (TP), have demonstrated a dose-dependent reduction in hypoxia-induced BMEC permeability.

Purpose of the Study:

• To investigate the effect of MH and TP on VEGF expression during hypoxia in BMEC.
• To elucidate the mechanism by which barbiturates influence hypoxia-induced VEGF synthesis and its impact on BMEC permeability.

Main Methods:

• BMEC cultures were subjected to hypoxic conditions.
• VEGF expression levels and mRNA stabilization were analyzed in the presence and absence of MH and TP.
• Permeability assays were conducted under both normoxic and hypoxic conditions with and without barbiturate treatment.

Main Results:

• Both MH and TP significantly decreased hypoxia-induced VEGF expression in BMEC in a concentration-dependent manner.
• Barbiturates were found to impair hypoxia-induced VEGF mRNA stabilization.
• MH and TP did not affect VEGF-induced permeability changes during normoxia, indicating a direct effect on hypoxia-induced VEGF synthesis.

Conclusions:

• Barbiturates inhibit hypoxia-induced VEGF expression in BMEC, partly by affecting VEGF mRNA stabilization.
• The reduction in VEGF-mediated permeability by barbiturates may contribute to their neuroprotective effects by reducing brain edema formation.