Related Experiment Video
Updated: Apr 18, 2026
Stab-Wound Mouse Model for Studying Hemorrhage and Inflammation in Traumatic Brain Injury
Published on: February 21, 2025
PGE2 receptor agonist misoprostol protects brain against intracerebral hemorrhage in mice
1Department of Pathology, First Clinical Hospital, Harbin Medical University, Harbin, China; Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University, School of Medicine, Baltimore, MD, USA.
Abstract:
Intracerebral hemorrhage (ICH) is a devastating form of stroke. Misoprostol, a synthetic prostaglandin E1 (PGE1) analog and PGE2 receptor agonist, has shown protection against cerebral ischemia. In this study, we tested the efficacy of misoprostol in the 12-month-old mice subjected to 1 of 2 complementary ICH models, the collagenase model (primary study) and blood model (secondary study, performed in an independent laboratory). We also investigated its potential mechanism of action. Misoprostol posttreatment decreased brain lesion volume, edema, and brain atrophy and improved long-term functional outcomes. In the collagenase-induced ICH model, misoprostol decreased cellular inflammatory response; attenuated oxidative brain damage and gelatinolytic activity; and decreased high-mobility group box 1 (HMGB1) expression, Src kinase activity, and interleukin-1β expression without affecting cyclooxygenase-2 expression. Furthermore, HMGB1 inhibition with glycyrrhizin decreased Src kinase activity, gelatinolytic activity, neuronal death, and brain lesion volume. Src kinase inhibition with 4-amino-5-(4-chlorophenyl)-7-(t-butyl)pyrazolo[3,4-d]pyrimidine (PP2) decreased gelatinolytic activity and brain edema and improved neurologic function but did not decrease HMGB1 protein level. These results indicate that misoprostol protects brain against ICH injury through mechanisms that may involve the HMGB1, Src kinase, and matrix metalloproteinase-2/9 pathways.
Insights
Misoprostol treatment reduced brain damage and improved outcomes after intracerebral hemorrhage (ICH) in mice. It works by affecting pathways involving HMGB1, Src kinase, and matrix metalloproteinases, offering potential therapeutic benefits for stroke.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Intracerebral hemorrhage (ICH) is a severe type of stroke with limited treatment options.
- Misoprostol, a prostaglandin E1 (PGE1) analog, has demonstrated neuroprotective effects in cerebral ischemia models.
Purpose of the Study:
- To evaluate the efficacy of misoprostol posttreatment in mouse models of ICH.
- To elucidate the underlying mechanisms of misoprostol's neuroprotective effects in ICH.
Main Methods:
- Two ICH models were used: collagenase-induced (primary) and blood-induced (secondary).
- Mice received misoprostol treatment after ICH induction.
- Investigated effects on brain lesion volume, edema, atrophy, inflammation, oxidative stress, and specific molecular pathways (HMGB1, Src kinase, MMPs).
Main Results:
- Misoprostol significantly reduced brain lesion volume, edema, and atrophy, improving long-term functional outcomes.
- It decreased inflammatory response, oxidative damage, and gelatinolytic activity in the collagenase model.
- Misoprostol attenuated HMGB1 expression, Src kinase activity, and IL-1β levels, but not COX-2.
- HMGB1 inhibition reduced neuronal death and lesion volume; Src kinase inhibition improved function but did not affect HMGB1 levels.
Conclusions:
- Misoprostol demonstrates significant neuroprotective effects in ICH mouse models.
- The protective mechanisms involve the HMGB1, Src kinase, and matrix metalloproteinase-2/9 pathways.
- Misoprostol represents a potential therapeutic agent for treating intracerebral hemorrhage.
