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(Stroke. 2006;37:3014.)
© 2006 American Heart Association, Inc.

Original Contributions

Baicalein and 12/15-Lipoxygenase in the Ischemic Brain

Klaus van Leyen, PhD; Hahn Young Kim, MD; Seong-Ryong Lee, MD; Guang Jin, MD, PhD; Ken Arai, PhD Eng H. Lo, PhD

From Stroke and Neurovascular Research Group (K.v.L., G.J., K.A., E.H.L.), Department of Radiology, Massachusetts General Hospital, Charlestown, Mass.

Correspondence to Klaus van Leyen, PhD, Massachusetts General Hospital, Neuroprotection Research Laboratory, 149 13th St., R. 2401, Charlestown, MA 02129. E-mail klaus_vanleyen{at}hms.harvard.edu

Background and Purpose— The natural product baicalein is a specific inhibitor of 12/15-lipoxygenase, but it also has antioxidant properties. The current study was designed to test if the neuroprotective properties of baicalein are related to its lipoxygenase inhibition.

Methods— The presence of 12/15-lipoxygenase in the ischemic mouse brain was demonstrated by immunohistochemistry. A mouse model of transient middle cerebral artery occlusion was used to study lipoxygenase-dependent protection of the ischemic brain by baicalein. Rat primary neurons were subjected to oxidative stress in the presence or absence of baicalein.

Results— In a mouse model of transient middle cerebral artery occlusion, 12/15-lipoxygenase is increased in the peri-infarct area surrounding the primary infarction, predominantly in neurons. Oxidative toxicity in primary rat neurons is reduced by baicalein. C57Bl6J mice are protected against transient focal ischemia by intraperitoneal injection of baicalein, and a similar degree of protection is seen in 12/15-lipoxygenase knockout mice compared with wild-type mice. In contrast, the 12/15-LOX knockout mice are not further protected by baicalein.

Conclusion— Baicalein protects against ischemia/reperfusion injury by inhibiting the 12/15-lipoxygenase pathway to neuronal cell death.

Key Words: antioxidant • baicalein • ischemia • lipoxygenase neuron

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