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The effects of propofol on NMDA- or nitric oxide-mediated neurotoxicity in vitro
S Shibuta1, V Sriranganathan, T Inoue
1Department of Anesthesiology, Osaka University Medical School, Suita-city, Japan.
Abstract:
Acute brain ischemia causes neurotoxic cascades including NMDA receptors and NO. Propofol, an i.v. anesthetic, is thought to have a neuroprotective effect. We investigated the influence of propofol on NMDA/NO neurotoxicity using Shibuta's established model of primary brain cultures. Cortical neurons prepared from E16 were used after 13-14 days in culture. The neurons were exposed to various concentrations of propofol with NMDA or NO-donor. The survival rates of neurons exposed to 30 microM NMDA with or without 300 microM propofol were 12.1 +/- 2.2% and 11.9 +/- 2.2%, respectively. The survival rates exposed to 30 microM NO-donor with or without 300 microM propofol were 11.2 +/- 4.2% and 14.0 +/- 3.9%, respectively. These results suggest that neuroprotective effect of propofol is limited and propofol does not offer advantages over thiopental against NMDA/NO-induced cytotoxicity.
Insights
Propofol, an anesthetic, shows limited neuroprotection against NMDA receptor and nitric oxide (NO) toxicity in brain cells. It offers no advantage over thiopental in preventing this cytotoxicity.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Acute brain ischemia triggers neurotoxic pathways involving N-methyl-D-aspartate (NMDA) receptors and nitric oxide (NO).
- Propofol, a widely used intravenous anesthetic, is hypothesized to possess neuroprotective properties against such insults.
Purpose of the Study:
- To investigate the effect of propofol on NMDA and NO-induced neurotoxicity in primary cortical neuron cultures.
- To compare the potential neuroprotective efficacy of propofol against NMDA/NO cytotoxicity.
Main Methods:
- Primary cortical neurons from embryonic day 16 (E16) were cultured for 13-14 days.
- Neurons were exposed to varying concentrations of propofol alongside NMDA or an NO-donor.
- Neuronal survival rates were quantified to assess the impact of propofol treatment.
Main Results:
- Propofol did not significantly alter neuronal survival when co-administered with NMDA (12.1% vs. 11.9% survival).
- Propofol also failed to improve survival rates when neurons were exposed to an NO-donor (11.2% vs. 14.0% survival).
- These findings indicate a limited role for propofol in mitigating NMDA/NO-induced neurotoxicity.
Conclusions:
- Propofol exhibits minimal neuroprotective effects against NMDA and NO-mediated neurotoxicity in this experimental model.
- Propofol does not demonstrate superior neuroprotective advantages compared to thiopental in the context of NMDA/NO-induced cytotoxicity.