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Protein’s role in regulating cell death sets direction for Alzheimer’s, Parkinson’s and cancer reseach

A protein called calpain can play a key role in regulating cell death, a Queen’s University study has found. Proof has been raised by these scientists //that calpain may be used to promote cell death in cancer cells but can be directed to prevent cell death such as in neuronal cells in the case of Alzheimer’s or Parkinson’s.

Dr. Greer is a Professor of Pathology and Molecular Medicine with the Cancer Biology and Genetics division of Queen’s University’s Cancer Research Institute. 'All cells in our body have the ability to trigger an intrinsic programmed cell death response. In the case of nerve cells that have been temporarily cut off from their oxygen supply because of a stroke, or damaged by amyloid deposits, this might seem like a bad thing that could contribute to neurodegenerative disease,' says Dr. Greer who produced the study with Yinfei Tan, Nathalie Dourdin, Chao Wu, Teresa De Veyra, and John S. Elce.'On the other hand, when a cell's chromosomes are damaged by carcinogens or ultraviolet light in a way that could initiate cancer, this same programmed cell death response could save your life.'

Supported by an operating grant from the Canadian Institute of Health Research the first study, now published online and to appear in print on June 9, showed that calpain promoted programmed cell death after cells were damaged by chemicals that disrupt the endoplasmic reticulum, which is a major synthetic structure in the cell that controls the synthesis and distribution of new proteins.

In the second study, now published in JBC online, Dr. Greer and co-investigators Yinfei Tan, Chao Wu, and Teresa De Veyra, found that calpain also inhibits programmed cell death in response to other challenges, including some chemotherapeutic drugs.

This study showed that calpain contributes to the activation of AKT and JNK, two key players in the signaling pathways that control cellular responses to different death stimuli. These discov
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