Published Online
on December 29, 2003

A more recent version of this article appeared on February 1, 2004

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Submitted on September 29, 2003
Revised on October 31, 2003

Kallikrein Gene Transfer Protects Against Ischemic Stroke by Promoting Glial Cell Migration and Inhibiting Apoptosis

Chun-Fang Xia; Hang Yin; Cesar V. Borlongan; Lee Chao; and Julie Chao^*

From the Department of Biochemistry and Molecular Biology (C.-F.X., H.Y., L.C., J.C.), Medical University of South Carolina, Charleston, and the Department of Neurology and Institute of Molecular Medicine and Genetics (C.V.B.), Medical College of Georgia, Augusta.

^* To whom correspondence should be addressed. E-mail: chaoj{at}musc.edu.

Abstract--Kallikrein/kinin has been shown to protect against ischemia/reperfusion-induced myocardial infarction and apoptosis. In the present study, we examined the potential neuroprotective action of kallikrein gene transfer in cerebral ischemia. Adult, male Sprague-Dawley rats were subjected to a 1-hour occlusion of the middle cerebral artery followed by intracerebroventricular injection of adenovirus harboring either the human tissue kallikrein gene or the luciferase gene. Kallikrein gene transfer significantly reduced ischemia-induced locomotor deficit scores and cerebral infarction after cerebral ischemia injury. Expression of recombinant human tissue kallikrein was identified and localized in monocytes/macrophages of rat ischemic brain by double immunostaining. Morphological analyses showed that kallikrein gene transfer enhanced the survival and migration of glial cells into the ischemic penumbra and core, as identified by immunostaining with glial fibrillary acidic protein. Cerebral ischemia markedly increased apoptotic cells, and kallikrein gene delivery reduced apoptosis to near-normal levels as seen in sham control rats. In primary cultured glial cells, kinin stimulated cell migration but inhibited hypoxia/reoxygenation-induced apoptosis in a dose-dependent manner. The effects of kinin on both migration and apoptosis were abolished by icatibant, a bradykinin B₂ receptor antagonist. Enhanced cell survival after kallikrein gene transfer occurred in conjunction with markedly increased cerebral nitric oxide levels and phospho-Akt and Bcl-2 levels but reduced caspase-3 activation, NAD(P)H oxidase activity, and superoxide production. These results indicate that kallikrein gene transfer provides neuroprotection against cerebral ischemia injury by enhancing glial cell survival and migration and inhibiting apoptosis through suppression of oxidative stress and activation of the Akt-Bcl-2 signaling pathway.

Key words: ischemia • stroke • kinins • gene transfer • apoptosis

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