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Ischemic tolerance in murine cortical cell culture: critical role for NMDA receptors
1Center for the Study of Nervous System Injury and Department of Neurology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Abstract:
Murine cortical cultures containing both neurons and glia (days in vitro 13-15) were exposed to periods of oxygen-glucose deprivation (5-30 min) too brief to induce neuronal death. Cultures "preconditioned" by sublethal oxygen-glucose deprivation exhibited 30-50% less neuronal death than controls when exposed to a 45-55 min period of oxygen-glucose deprivation 24 hr later. This preconditioning-induced neuroprotection was specific in that neuronal death induced by exposure to excitotoxins or to staurosporine was not attenuated. Neuroprotection was lost if the time between the preconditioning and severe insult were decreased to 7 hr or increased to 72 hr and was blocked if the NMDA antagonist 100 microM 3-((D)-2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid was applied during the preconditioning insult. This was true even if the duration of preconditioning was increased as far as possible (while still remaining sublethal). A similar preconditioning effect was also produced by sublethal exposure to high K+, glutamate, or NMDA but not to kainate or trans-1-aminocyclopentane-1, 3-dicarboxylic acid.
Insights
Preconditioning murine cortical cultures with brief oxygen-glucose deprivation protects neurons from subsequent lethal insults. This neuroprotection is specific and requires NMDA receptor activation during preconditioning.
Area of Science:
- Neuroscience
- Cell Biology
Background:
- Neuronal damage from oxygen-glucose deprivation (OGD) is a significant concern.
- Understanding endogenous protective mechanisms is crucial for developing neuroprotective strategies.
Purpose of the Study:
- To investigate the neuroprotective effects of sublethal oxygen-glucose deprivation (OGD) preconditioning in murine cortical cultures.
- To determine the specificity and underlying mechanisms of OGD-induced neuroprotection.
Main Methods:
- Murine cortical cultures were subjected to sublethal OGD (5-30 min) followed by a lethal OGD insult 24 hours later.
- Neuroprotection was assessed by quantifying neuronal death.
- The role of NMDA receptors was investigated using an NMDA antagonist.
Main Results:
- Sublethal OGD preconditioning reduced neuronal death by 30-50% after a subsequent lethal OGD insult.
- Neuroprotection was specific to OGD-induced death and not observed with excitotoxins or staurosporine.
- Protection was dependent on the timing between insults and was blocked by NMDA receptor antagonism during preconditioning.
Conclusions:
- Brief, sublethal oxygen-glucose deprivation can induce significant neuroprotection against subsequent severe ischemic insults in cortical neurons.
- NMDA receptor activation during the preconditioning stimulus is critical for establishing this protective effect.
- This preconditioning phenomenon offers a potential therapeutic avenue for conditions involving neuronal ischemia.