Related Experiment Videos
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.
Abstract:
Programmed cell death, or apoptosis, is a tightly regulated process mediated by selective cleavage of proteins by caspases, resulting in ordered destruction of the cell. In addition to structural proteins, proteins that mediate anti-apoptotic signal transduction are also substrates; their destruction eliminates potential futile attempts to escape execution. We asked whether cAMP response element binding protein (CREB), a transcription factor that mediates nerve growth factor (NGF) survival signals, is a target for caspases during apoptosis. CREB was specifically cleaved by caspases in neuroblastoma extracts, and in cells induced to undergo apoptosis by staurosporine. The destruction of CREB eliminates a key factor that could reverse apoptosis.
Insights
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.