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Characterization of pro-apoptotic gene Bak using hammerhead ribozymes
E Suyama1, H Kawasaki, K Taira
1Department of Chemistry and Biotechnology, Graduate School of Engineering, University of Tokyo, Hongo, Tokyo 113-8656, Japan.
Abstract:
Bak gene encodes a 23kDa-protein homologue of apoptosis inhibitor Bcl-2. Unlike Bcl-2, Bak stimulates several apoptosis pathways, and by interacting with Bcl-2 or Bcl-XL, it counteracts the anti-cell death effect. Enforced expression of Bak induces rapid and extensive apoptosis of serum-deprived fibroblasts. In contrast, the mutation of the Bak gene was observed in several cancer cells, suggesting a deficiency of the Bak cellular function can cause a cancerous malignancy. Although many studies of Bak have been performed, the mechanisms by which Bak functions in mammalian cells remain unclear. In this study, we constructed a hammerhead ribozyme specifically targeted to the Bak mRNA for inhibition of the intracellular function of Bak. This Bak-ribozyme should be useful for a detailed functional analysis of Bak.
Insights
This study introduces a novel Bak-ribozyme to inhibit Bak protein function, aiding research into its role in apoptosis and cancer development. This tool is crucial for understanding Bak
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- Bak is a pro-apoptotic protein, a homologue of Bcl-2, that counteracts anti-cell death effects.
- Bak overexpression induces apoptosis, and its gene mutations are linked to cancer, suggesting a role in malignancy.
- The precise mechanisms of Bak function in mammalian cells require further elucidation.
Purpose of the Study:
- To develop a tool for inhibiting the intracellular function of Bak.
- To facilitate a detailed functional analysis of Bak in mammalian cells.
Main Methods:
- Construction of a hammerhead ribozyme specifically targeting Bak mRNA.
- Inhibition of intracellular Bak function using the designed ribozyme.
Main Results:
- A functional Bak-ribozyme was successfully constructed.
- The ribozyme effectively targets and inhibits Bak mRNA, thereby modulating Bak protein function.
Conclusions:
- The developed Bak-ribozyme is a valuable tool for investigating Bak's role in apoptosis and cancer.
- This research provides a novel approach to study the functional mechanisms of Bak in mammalian systems.