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CREB is cleaved by caspases during neural cell apoptosis
F François1, M J Godinho, M L Grimes
1Institute of Molecular Biosciences, Massey University, Private Bag 11222, Palmerston North, New Zealand.
FEBS Letters
|December 20, 2000
Summary
Programmed cell death involves caspase-mediated protein cleavage. Researchers found that cAMP response element binding protein (CREB), crucial for survival signals, is cleaved by caspases during apoptosis, preventing cell survival attempts.
Area of Science:
- Molecular Biology
- Cell Biology
- Neuroscience
Background:
- Apoptosis is a regulated process of cell death involving caspase enzymes.
- Anti-apoptotic proteins are cleaved during apoptosis to prevent cell survival.
- cAMP response element binding protein (CREB) mediates nerve growth factor (NGF) survival signals.
Purpose of the Study:
- To investigate if CREB is a caspase substrate during apoptosis.
- To determine the role of CREB cleavage in the apoptotic process.
Main Methods:
- Analysis of neuroblastoma cell extracts.
- Induction of apoptosis using staurosporine in cells.
- Assessing CREB cleavage by caspases.
Main Results:
- CREB was specifically cleaved by caspases in neuroblastoma extracts.
- CREB was also cleaved in cells undergoing staurosporine-induced apoptosis.
- The destruction of CREB by caspases was confirmed.
Conclusions:
- CREB is a direct caspase substrate during apoptosis.
- Cleavage of CREB by caspases eliminates a key factor that promotes cell survival.
- This finding provides insight into the regulation of apoptosis and survival signaling pathways.