Propofol prevents endothelial dysfunction induced by glucose overload.

Area of Science:

• Endothelial Cell Biology
• Anesthesiology
• Cardiovascular Research

Background:

• Surgical hyperglycemia impairs endothelial function.
• General anesthetics like propofol are commonly used during surgery.
• The specific effects of propofol on glucose-induced endothelial dysfunction require elucidation.

Purpose of the Study:

• To investigate the impact of propofol on glucose overload-induced dysfunction in bovine aortic endothelial cells (BAECs).
• To determine the mechanisms by which propofol affects superoxide anion (O2-) production and nitric oxide (NO) signaling.
• To assess propofol's influence on intracellular calcium (Ca2+) dynamics and glucose uptake in BAECs.

Main Methods:

• BAECs were subjected to D-glucose overload (23 mM).
• Superoxide anion accumulation was measured using MCLA chemiluminescence.
• Nitric oxide production was assessed via diaminofluorescence-2 (DAF-2) assay.
• ATP-induced Ca2+ oscillations and capacitative Ca2+ entry (CCE) were monitored.
• Intracellular glucose concentrations were quantified.

Main Results:

• D-glucose overload increased superoxide anion production, which was inhibited by propofol (IC50: 0.21 µM).
• Propofol reversed the attenuation of ATP-induced NO production caused by glucose overload (EC50: 0.60 µM).
• Propofol restored glucose overload-impaired Ca2+ oscillations and CCE (EC50: 0.31 µM and 1.0 µM, respectively).
• Propofol partially reduced the increased intracellular glucose concentration induced by overload.
• Propofol's effects on NO and Ca2+ were linked to superoxide reduction, unlike xanthine/xanthine oxidase controls.

Conclusions:

• Anesthetic concentrations of propofol protect BAECs from glucose overload-induced dysfunction.
• Propofol's protective effects are primarily mediated by reducing superoxide anion accumulation.
• Propofol's mechanism involves restoring Ca2+-dependent NO production and inhibiting cellular glucose uptake.