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Updated: Jan 9, 2026

Author Spotlight: Enhancing Cerebral Ischemia Research with a Simplified Rat Model
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4-Methylumbelliferone (4-MU) Improves Learning and Memory After Cerebral Ischemia/Reperfusion Injury in Rats.

Shaghayegh Tamouk1, Hamzeh Mirshekari Jahangiri1, Elham Kashafi Jahromi2

  • 1Physiology Research Center, Iran University of Medical Sciences, Tehran, Iran, iums.ac.ir.

Behavioural Neurology
|December 8, 2025
PubMed
Summary

4-methylumbelliferone (4-MU) reduces brain damage and memory loss after stroke in rats. This neuroprotective effect is linked to downregulating HAS1 and HAS2, offering hope for new stroke treatments.

Keywords:
4-methylumbelliferoneMCAOhyaluronan synthasesischemic strokelearning and memory impairmentsneuronal death

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Biochemistry

Background:

  • Stroke is a leading cause of death and disability.
  • Cerebral ischemia causes oxidative stress, inflammation, and memory deficits.
  • Novel therapeutic strategies, like 4-methylumbelliferone (4-MU), are being investigated for neuroprotection.

Purpose of the Study:

  • To investigate the neuroprotective effects of 4-MU against cerebral ischemia-reperfusion (I/R) injury.
  • To evaluate the impact of 4-MU on learning and memory impairments in a rat model.
  • To explore the molecular mechanisms underlying 4-MU's therapeutic potential.

Main Methods:

  • Male Wistar rats underwent middle cerebral artery occlusion (MCAO) to induce ischemia.
  • 4-MU treatment (25 mg/kg) was administered.
  • Learning and memory were assessed using automated shuttle box and Morris water maze (MWM) tests.
  • Infarct volume, cell death, and protein expression were analyzed via TTC staining, Nissl staining, and Western blot.

Main Results:

  • 4-MU significantly reduced infarct volume and improved learning and memory deficits.
  • Treatment with 4-MU downregulated HAS1 and HAS2 expression.
  • 4-MU modulated pro-inflammatory (TNF-α, IL-1β) and anti-inflammatory (IL-10) cytokines.
  • Markers of oxidative stress in the brain were reduced by 4-MU treatment.

Conclusions:

  • 4-MU demonstrates significant neuroprotective effects against cerebral I/R injury.
  • The observed benefits of 4-MU are associated with the downregulation of HAS1 and HAS2.
  • 4-MU holds promise as a therapeutic agent for mitigating stroke-induced brain damage and cognitive impairments.