Onion (Allium cepa) extract attenuates brain edema
Soo-Wang Hyun1, Mi Jang, Se Won Park
1Department of Physiology, Ajou University School of Medicine, Suwon, Republic of Korea.
Nutrition (Burbank, Los Angeles County, Calif.)
|July 10, 2012
Summary
Onion extract effectively reduces brain edema and protects the blood-brain barrier (BBB) in a mouse model of stroke. Its antioxidant properties appear key to preventing BBB dysfunction during brain ischemia.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Brain ischemia, often caused by stroke, leads to dangerous edema and blood-brain barrier (BBB) dysfunction.
- Understanding protective mechanisms against ischemia-reperfusion injury is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the neuroprotective effects of onion extract on brain edema and BBB integrity following ischemia.
- To explore the role of antioxidant mechanisms in mediating these protective effects.
Main Methods:
- Middle cerebral artery occlusion (MCAO) model in mice to induce brain ischemia.
- Intravenous administration of onion extract prior to MCAO.
- Assessment of brain water content, Evans blue extravasation, tight junction protein integrity, and oxidative stress markers (malondialdehyde, glutathione peroxidase, catalase).
Main Results:
- Onion extract significantly reduced brain edema and BBB hyperpermeability (decreased Evans blue extravasation).
- The extract preserved the integrity of tight junction proteins (zonula occludens-1 and occludin).
- Onion extract mitigated oxidative stress by reducing malondialdehyde and enhancing antioxidant enzyme activities (catalase, glutathione peroxidase).
Conclusions:
- Onion extract demonstrates significant efficacy in preventing brain edema and BBB disruption in an MCAO mouse model.
- The protective effects are likely mediated by the extract's potent antioxidant properties.
- Onion extract shows potential as a therapeutic agent for maintaining BBB function during ischemic events.
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