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Updated: Aug 28, 2025
Author Spotlight: Enhancing Cerebral Ischemia Research with a Simplified Rat Model
Published on: July 5, 2024
Propofol ameliorates ischemic brain injury by blocking TLR4 pathway in mice
Kazuha Mitsui1, Masakazu Kotoda1, Sohei Hishiyama1
1Department of Anesthesiology, Faculty of Medicine, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi 409-3898, Japan.
Abstract:
Ischemic brain injury is one of the most serious perioperative complications. However, effective preventative methods have not yet been established. This study aimed to investigate whether propofol has neuroprotective effects against ischemic brain injury, with a specific focus on Toll-like receptor 4 (TLR4). Focal brain ischemia was induced via a combination of left common carotid artery occlusion and distal left middle cerebral artery coagulation in mice. Either propofol (10 mg/kg) or vehicle was intravenously injected 10 min prior to the induction of brain ischemia in wild-type and TLR4 knockout mice. Infarct volume, pro-inflammatory cytokine expression, inflammatory cell infiltration, and neurobehavioral function were assessed. Propofol administration significantly reduced infarct volume in wild-type mice (26.9 ± 2.7 vs 15.7 ± 2.0 mm3 at day 7), but not in TLR4 knockout mice. Compared with the control mice, the propofol-treated wild-type mice exhibited lower levels of IL-6 (0.57 ± 0.23 vs 1.00 ± 0.39 at 24 h), and smaller numbers of TLR4-expressing microglia in the penumbra (11.7 ± 3.1 vs 25.1 ± 4.7 cells/0.1 mm2). In conclusion, propofol administration prior to ischemic brain insult attenuated brain injury by blocking the TLR4-dependent pathway and suppressing pro-inflammatory cytokine production.
Insights
Propofol offers neuroprotection against ischemic brain injury by inhibiting the Toll-like receptor 4 (TLR4) pathway. This reduces inflammation and brain damage in a mouse model.
Area of Science:
- Neuroscience
- Anesthesiology
- Immunology
Background:
- Ischemic brain injury is a severe perioperative complication with limited preventative strategies.
- The Toll-like receptor 4 (TLR4) pathway is implicated in inflammatory responses following brain ischemia.
Purpose of the Study:
- To investigate the neuroprotective potential of propofol against ischemic brain injury.
- To elucidate the role of the Toll-like receptor 4 (TLR4) pathway in propofol's neuroprotective effects.
Main Methods:
- Focal cerebral ischemia was induced in mice using carotid artery occlusion and middle cerebral artery coagulation.
- Propofol or vehicle was administered intravenously before ischemia induction in wild-type and TLR4 knockout mice.
- Infarct volume, pro-inflammatory cytokine levels (IL-6), inflammatory cell infiltration, and neurobehavioral function were assessed.
Main Results:
- Propofol significantly reduced infarct volume in wild-type mice but not in TLR4 knockout mice.
- Propofol treatment decreased IL-6 levels and reduced TLR4-expressing microglia in the ischemic penumbra of wild-type mice.
- Neurobehavioral function was improved in propofol-treated wild-type mice compared to controls.
Conclusions:
- Propofol exhibits neuroprotective effects against ischemic brain injury.
- These protective effects are mediated through the inhibition of the TLR4-dependent inflammatory pathway.
- Propofol may serve as a potential therapeutic agent for preventing perioperative ischemic brain injury.
