Related Experiment Video
Updated: Aug 19, 2026
2-Vessel Occlusion/Hypotension: A Rat Model of Global Brain Ischemia
Published on: June 22, 2013
[Effects of volatile anesthetics on microtubule-associated protein 2 degradation during forebrain ischemia in the
1Department of Anesthesiology and Reanimatology, School of Medicine, Gunma University, Maebashi.
Abstract:
One of the most prominent phenomena that occurs during the early phase of cerebral ischemia has been shown to be the immunohistochemical collapse of cytoskeletal proteins. Among these, microtubule-associated protein 2 (MAP 2) has been shown to be vulnerable to ischemic injuries. In order to select a suitable volatile anaesthetic from the standpoint of cytoskeletal protein breakdown during cerebral ischemia, we compared the effect of isoflurane, halothane and sevoflurane on MAP 2 degradation during 20 min of forebrain ischemia in the rat. Under 1 MAC of three volatile anesthetics, forebrain ischemia was induced by the occlusion of the bilateral common carotid artery combined with a lowering of mean arterial pressure to 50 mmHg. Immediately after cerebral ischemia, four regions of the brain, the frontoparietal cortex, brainstem, hippocampus and cerebellum, were removed separately and homogenized. Subsequently, MAP 2 from each region was quantitatively measured using an enzyme-linked immunosorbent assay. MAP 2 in the frontoparietal cortex and hippocampus was significantly protected from degradation with isoflurane anaesthesia more than with halothane and sevoflurane anaesthesia.
Insights
Isoflurane anesthesia better protects microtubule-associated protein 2 (MAP 2) from degradation during cerebral ischemia compared to halothane and sevoflurane. This finding is crucial for selecting anesthetics to minimize brain injury during stroke.
Area of Science:
- Neuroscience
- Anesthesiology
- Cell Biology
Background:
- Cerebral ischemia causes cytoskeletal protein breakdown, particularly microtubule-associated protein 2 (MAP 2).
- The choice of anesthetic may influence the extent of MAP 2 degradation during ischemic events.
Purpose of the Study:
- To compare the neuroprotective effects of isoflurane, halothane, and sevoflurane on MAP 2 degradation during cerebral ischemia.
- To identify the most suitable volatile anesthetic for minimizing cytoskeletal damage in ischemic conditions.
Main Methods:
- Forebrain ischemia was induced in rats for 20 minutes under 1 MAC of isoflurane, halothane, or sevoflurane.
- MAP 2 levels were quantified in four brain regions (frontoparietal cortex, brainstem, hippocampus, cerebellum) using ELISA post-ischemia.
Main Results:
- Isoflurane anesthesia significantly protected MAP 2 from degradation in the frontoparietal cortex and hippocampus compared to halothane and sevoflurane.
- MAP 2 degradation varied across brain regions, with greater protection observed in the cortex and hippocampus under isoflurane.
Conclusions:
- Isoflurane demonstrates superior neuroprotective potential against MAP 2 degradation during cerebral ischemia compared to halothane and sevoflurane.
- These findings suggest isoflurane may be a preferred anesthetic choice to mitigate cytoskeletal damage in patients experiencing ischemic events.
