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Updated: May 19, 2026
21:08
Engineering Cell-permeable Protein
Published on: December 28, 2009
Certain protein transducing agents convert translocated proteins into cell killers
Siergiej Tcherniuk1, Anne-Laure Fiser, Madiha Derouazi
1Institute of Structural Biology, CNRS-CEA-UJF, UMR, Grenoble, France.
Acta Biochimica Polonica
|September 5, 2012
Summary
Delivering proteins into cells using transducing agents can be toxic. A novel peptide, Wr-T, showed no toxicity, but the cytotoxic effect of protein VPg was confirmed, urging caution with cell-penetrating agents.
Area of Science:
- Biotechnology
- Cell Biology
- Drug Delivery
Background:
- Most proteins cannot enter cells, limiting therapeutic applications.
- Intracytoplasmic delivery of protein therapeutics requires efficient delivery systems.
Purpose of the Study:
- To evaluate the efficacy and safety of protein transduction for delivering a cytotoxic protein (VPg) into cells.
- To assess the toxicity of various protein transduction agents and the VPg protein itself.
Main Methods:
- In vitro protein transduction using commercial agents and a novel peptide (Wr-T).
- Assessment of cell viability following protein delivery.
- Comparison of toxicity between control proteins and VPg protein.
Main Results:
- Commercial transduction agents induced cell death with both control and VPg proteins.
- The novel transducing peptide Wr-T demonstrated no toxicity across a range of concentrations.
- VPg protein exhibited significant cytotoxicity, while control proteins did not, when delivered using Wr-T.
Conclusions:
- Protein transduction agent efficacy and safety must be carefully evaluated.
- The cytotoxic effects observed were attributable to the delivered protein (VPg), not the transduction method itself.
- Results highlight the importance of interpreting cell-penetrating agent data cautiously.
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