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Bilateral Common Carotid Artery Occlusion as an Adequate Preconditioning Stimulus to Induce Early Ischemic Tolerance to Focal Cerebral Ischemia
Published on: May 9, 2013
Resistance to cerebral ischemia in developing gerbils
1Department of Neurosurgery, Juntendo University, Tokyo, Japan.
Summary
Young gerbils show remarkable tolerance to cerebral ischemia, with neuronal survival after bilateral carotid occlusion (BCO) significantly higher than in adult animals. This enhanced ischemic tolerance is not linked to improved collateral circulation.
Area of Science:
- Neuroscience
- Ischemic Stroke Research
- Developmental Biology
Background:
- Cerebral ischemia, particularly during development, poses significant risks to neuronal survival.
- Understanding age-dependent differences in ischemic tolerance is crucial for developing effective neuroprotective strategies.
- Previous research suggested enhanced collateral circulation in developing animals might confer protection.
Purpose of the Study:
- To investigate age-related differences in tolerance to cerebral ischemia in gerbils.
- To determine the role of rectal temperature regulation during reperfusion on neuronal survival.
- To examine the contribution of collateral circulation to ischemic tolerance in developing gerbils.
Main Methods:
- Gerbils of varying ages (2-12 weeks) underwent bilateral carotid occlusion (BCO) for different durations.
- Rectal and cranial temperatures were controlled during BCO; rectal temperature was monitored during reperfusion.
- Neuronal density in the hippocampal CA1 subfield was assessed 7 days post-ischemia; cerebral ischemia extent was evaluated using [14C]iodoantipyrine autoradiography.
Main Results:
- Two-week-old gerbils exhibited hypothermia during reperfusion if unregulated, while older gerbils showed hyperthermia.
- Five-minute BCO caused near-complete CA1 neuron destruction in 12-week-old gerbils.
- Most CA1 neurons survived 30 min of BCO in 2-week-old gerbils without temperature regulation and 15 min with regulation, despite severe forebrain ischemia in both age groups.
Conclusions:
- Developing gerbils demonstrate significantly greater tolerance to cerebral ischemia compared to adult gerbils.
- Ischemic tolerance in young gerbils is not attributable to a more developed collateral circulation between the vertebrobasilar and carotid systems.
- Thermoregulation during reperfusion influences neuronal survival in developing gerbils, but the primary protective factor appears to be developmental stage itself.
