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Published online 21 August 2000. doi:10.1083/jcb.150.4.887
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© The Rockefeller University Press, 0021-9525/2000/8/887/ $5.00
The Journal of Cell Biology, Volume 150, Number 4, August 21, 2000 887-894


Report

Cross-talk between Two Cysteine Protease Families: Activation of Caspase-12 by Calpain in Apoptosis

Toshiyuki Nakagawaa and Junying Yuana
a Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115

Correspondence to: Junying Yuan, Department of Cell Biology, Harvard Medical School, 240 Longwood Ave., Boston, MA 02115. Tel:(617) 432-4170 Fax:(617) 432-4177 E-mail:jyuan{at}hms.harvard.edu.

Calpains and caspases are two cysteine protease families that play important roles in regulating pathological cell death. Here, we report that m-calpain may be responsible for cleaving procaspase-12, a caspase localized in the ER, to generate active caspase-12. In addition, calpain may be responsible for cleaving the loop region in Bcl-xL and, therefore, turning an antiapoptotic molecule into a proapoptotic molecule. We propose that disturbance to intracellular calcium storage as a result of ischemic injury or amyloid ß peptide cytotoxicity may induce apoptosis through calpain- mediated caspase-12 activation and Bcl-xL inactivation. These data suggest a novel apoptotic pathway involving calcium-mediated calpain activation and cross-talks between calpain and caspase families.

Key Words: calcium, Alzheimer's disease, Bcl-xL, endoplasmic reticulum, ER stress


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