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Isoflurane reduces microtubule-associated protein 2 degradation compared with halothane during forebrain ischaemia in
1Department of Anaesthesiology and Reanimatology, Gunma University School of Medicine, Japan.
Abstract:
One of the most prominent features of the early phase of cerebral ischaemia is the immunohistochemical collapse of cytoskeletal proteins. Among these proteins, microtubule-associated protein 2 (MtP2) has been shown to be vulnerable to ischaemic injuries. In order to identify a suitable volatile anaesthetic on the basis of cytoskeletal protein breakdown during cerebral ischaemia, we have compared the effects of isoflurane and halothane on MtP2 degradation in rats. Under equipotent isoflurane or halothane anaesthesia, forebrain ischaemia was induced by occlusion of the bilateral common carotid artery, combined with a decrease in mean arterial pressure to 50 mm Hg. After 20 min of ischaemia, the frontoparietal cortex, brainstem, hippocampus and cerebellum were removed separately and homogenized. MtP2 from each region was measured using an enzyme-linked immunosorbent assay. MtP2 degradation in the frontoparietal cortex and hippocampus was significantly (P < 0.05 and P < 0.01) less with isoflurane anaesthesia (75.6 (SD 10.7)% and 72.3 (12.8)%, respectively) than with halothane (65.0 (13.1)% and 54.7 (13.9)%, respectively).
Insights
Isoflurane anesthesia better protects microtubule-associated protein 2 (MtP2) from degradation during cerebral ischemia compared to halothane. This suggests isoflurane may be a more suitable anesthetic for patients undergoing procedures where brain protection is critical.
Area of Science:
- Neuroscience
- Anesthesiology
- Biochemistry
Background:
- Cerebral ischemia causes cytoskeletal protein breakdown, particularly microtubule-associated protein 2 (MtP2).
- MtP2's vulnerability makes it a target for assessing anesthetic neuroprotection.
Purpose of the Study:
- To compare the neuroprotective effects of isoflurane and halothane on MtP2 degradation during cerebral ischemia.
- To identify a potentially more suitable volatile anesthetic for brain protection.
Main Methods:
- Rats underwent forebrain ischemia under equipotent isoflurane or halothane anesthesia.
- Bilateral common carotid artery occlusion and induced hypotension (50 mm Hg) were used to induce ischemia.
- MtP2 levels were measured via ELISA in homogenized brain regions (cortex, brainstem, hippocampus, cerebellum) after 20 minutes of ischemia.
Main Results:
- Isoflurane anesthesia significantly reduced MtP2 degradation in the frontoparietal cortex and hippocampus compared to halothane.
- MtP2 levels were higher with isoflurane (75.6% and 72.3%) than halothane (65.0% and 54.7%) in these regions, respectively (P < 0.05 and P < 0.01).
Conclusions:
- Isoflurane provides superior protection against MtP2 degradation during cerebral ischemia compared to halothane.
- These findings suggest isoflurane may offer better neuroprotection in ischemic conditions.
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