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Updated: May 20, 2026
A Model for Encephalomyosynangiosis Treatment after Middle Cerebral Artery Occlusion-Induced Stroke in Mice
Published on: June 22, 2022
A pentapeptide monocyte locomotion inhibitory factor protects brain ischemia injury by targeting the
Yuefan Zhang1, Jun Chen, Fan Li
1Department of Pharmacology, School of Pharmacy, Second Military Medical University, Shanghai, China.
Background And Purpose:
Ischemic stroke is a major cause of death worldwide but lacks viable treatment or treatment targets. Monocyte locomotion inhibitory factor (MLIF) is a small heat-stable pentapeptide produced by Entamoeba histolytica in axenic culture, which is supposed to protect the brain from ischemic injury; the mechanism, however, remains unknown. In this study, we further investigated the mechanism underlying the protective role of MLIF in brain ischemia.
Methods:
A middle cerebral artery occlusion model in rats was used for detecting the effect of MLIF in the brain ischemia in vivo. To identify targets of MLIF in brain endothelial cells, we performed immunoprecipitation of biotin-conjugated MLIF and mass spectrometry.
Results:
MLIF can protect the brain from ischemic injury in vivo, yielding decreased ischemic volume, prolonged survival, and improved neurological outcome. In vitro studies showed that MLIF displayed protective effects through inhibition of expression of pathological inflammatory adhesion molecules and enhancing endothelial nitric oxide synthase expression and nitric oxide release in the cerebrovascular endothelium. The target screening experiments demonstrated binding of MLIF to the ribosomal protein translation elongation factor eEF1A1. MLIF enhanced endothelial nitric oxide synthase expression through stabilization of endothelial nitric oxide synthase mRNA, and eEF1A1 was shown to be necessary for this enhanced expression. Knockdown of eEF1A1 or inhibition of endothelial nitric oxide synthase attenuated MLIF-mediated inhibition of adhesion molecule expression.
Conclusions:
In this study, we identified a new potential pharmacologically targetable mechanism underlying MLIF's protective effects in brain ischemia through the eEF1A1/endothelial nitric oxide synthase pathway.
Insights
Monocyte locomotion inhibitory factor (MLIF) protects the brain from ischemic stroke by stabilizing endothelial nitric oxide synthase mRNA via the eEF1A1 protein, offering a new therapeutic target.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Ischemic stroke is a leading cause of global mortality with limited treatment options.
- Monocyte locomotion inhibitory factor (MLIF) is a peptide with potential neuroprotective properties, but its mechanism of action is unclear.
Purpose of the Study:
- To elucidate the mechanism by which MLIF protects the brain against ischemic injury.
- To identify molecular targets of MLIF in cerebrovascular endothelial cells.
Main Methods:
- In vivo middle cerebral artery occlusion model in rats.
- Immunoprecipitation of biotin-conjugated MLIF followed by mass spectrometry to identify binding partners.
- In vitro studies assessing inflammatory molecule expression, endothelial nitric oxide synthase (eNOS) expression, and nitric oxide (NO) release.
Main Results:
- MLIF demonstrated significant neuroprotection in vivo, reducing infarct volume and improving survival and neurological outcomes.
- MLIF inhibited pro-inflammatory adhesion molecules and enhanced eNOS expression and NO release in cerebrovascular endothelium.
- MLIF directly binds to eukaryotic elongation factor 1 alpha 1 (eEF1A1).
- eEF1A1 is essential for MLIF-mediated stabilization of eNOS mRNA, leading to increased eNOS expression.
- Knockdown of eEF1A1 or inhibition of eNOS abrogated MLIF's protective effects.
Conclusions:
- MLIF confers neuroprotection against ischemic stroke via a novel pathway involving eEF1A1 and eNOS.
- The eEF1A1/eNOS pathway represents a promising, pharmacologically targetable mechanism for treating ischemic stroke.
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