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Cross-talk Between Calpain and Caspase-3 in Penumbra and Core During Focal Cerebral Ischemia-reperfusion

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Publisher Springer
Date 2007 Dec 25
PMID 18157632
Citations 12
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Abstract

Aims: Some data have shown the functional connection between calpain and caspase-3. Here, we investigated the cross-talk between calpain and caspase-3 in penumbra and core during focal cerebral ischemia-reperfusion.

Methods: The activities of calpain and the levels of calpastatin, microtubule-associated protein-2 (MAP-2), and spectrin in penumbra and core at 3 or 23 h of reperfusion (R 3 h or R 23 h) after 1-h focal cerebral ischemia in rats were determined in sham- or caspase-3 inhibitor z-DEVD-CHO-treated rats.On the other hand, the determination of the activities of caspase-3 and the levels of MAP-2 and spectrin was done in sham- or calpain-inhibitor I-treated rats.

Results: z-DEVD-CHO (600 ng/rat, i.c.v.) markedly reduced the mu- and m-calpain activities in penumbra and the m-calpain activities in core at R 3 h and R 23 h, and enhanced the calpastatin levels in penumbra at R 3 h and in core at R 3 h and R 23 h significantly; however, it had no significant effects on the mu-calpain activities in core and the calpastatin levels in penumbra at R 23 h. Calpain inhibitor I (0.8 mg/rat, i.c.v.) markedly reduced the caspase-3 activities in core at R 3 h and R 23 h, but not in penumbra. Both calpain and caspase-3 inhibitors increased the levels of MAP-2 and spectrin in penumbra and core significantly after focal cerebral ischemia-reperfusion.

Conclusions: Our data provide direct evidence to demonstrate the cross-talk between calpain and caspase-3 in penumbra and core during focal cerebral ischemia-reperfusion.

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