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Updated: Aug 18, 2026
Lateral Chronic Cranial Window Preparation Enables In Vivo Observation Following Distal Middle Cerebral Artery Occlusion in Mice
Published on: December 29, 2016
Decreased brain infarct following focal ischemia in mice lacking the transcription factor E2F1
J P MacManus1, C J Koch, M Jian
1Apoptosis Research Group, Institute for Biological Sciences, National Research Council of Canada, Ottawa, ON. John.MacManus@NRC.CA
Abstract:
E2F1+/- mice subjected to 2 h middle cerebral artery occlusion developed an infarct of 77.0 +/- 3.2 mm3 (mean +/- s.e.m., n = 15) in the ischemic hemisphere after 24 h reperfusion. A significantly smaller infarct of 58.8 +/- 4.8 mm3 (n = 15; p < 0.01) was found in E2F1-/- animals. Both deficient and normal mice had similar cerebral angioarchitecture and intra-ischemic decreases in regional blood flow. Similar areas of hypoxia in both groups of ischemic animals were demonstrated directly by immunohistochemical detection of nitroimidazole adducts. It was concluded that all animals received the same ischemic insult, yet the subsequent damage was different in the mutant mice. This is the first indication that the E2F1 gene plays a role in ischemic death of post-mitotic neurons.
Insights
Mice lacking the E2F1 gene showed reduced brain damage after stroke. This suggests the E2F1 gene influences neuronal death following ischemic events.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Stroke, or ischemic events, can lead to significant neuronal damage.
- The E2F1 gene is involved in cell cycle regulation and apoptosis.
- The role of E2F1 in post-mitotic neuronal death after ischemia is not well understood.
Purpose of the Study:
- To investigate the role of the E2F1 gene in neuronal death following ischemic stroke.
- To determine if E2F1 deficiency impacts infarct size in a mouse model of stroke.
Main Methods:
- Middle cerebral artery occlusion (MCAO) model in mice.
- Comparison of infarct volume in E2F1+/- (wild-type) and E2F1-/- (deficient) mice.
- Assessment of cerebral blood flow and hypoxia using immunohistochemistry.
Main Results:
- E2F1+/- mice developed an average infarct volume of 77.0 mm3.
- E2F1-/- mice exhibited a significantly smaller infarct volume of 58.8 mm3 (p < 0.01).
- Cerebral angioarchitecture, blood flow, and hypoxia levels were similar between groups, indicating comparable ischemic insult.
Conclusions:
- The E2F1 gene plays a significant role in the ischemic death of post-mitotic neurons.
- E2F1 deficiency confers neuroprotection against ischemic brain injury.
- This study provides the first evidence linking E2F1 to neuronal survival after stroke.
