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Erschienen in: Annals of Surgical Oncology 5/2007

01.05.2007 | Lab Research

TAT-Bim Induces Extensive Apoptosis in Cancer Cells

verfasst von: Hiroyuki Kashiwagi, Jonathan E. McDunn, Peter S. Goedegebuure, Mary C. Gaffney, Katherine Chang, Kathryn Trinkaus, David Piwnica-Worms, Richard S. Hotchkiss, William G. Hawkins

Erschienen in: Annals of Surgical Oncology | Ausgabe 5/2007

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Abstract

Background

Suppression of apoptosis is central to the development of cancer and is associated with resistance to modern adjuvant treatments. Therefore, molecules and pathways of apoptotic processes are critical targets for the development of anti-cancer therapeutics. Since apoptosis is executed by intracellular proteins, molecular approaches must incorporate a method to deliver the treatment into the tumor cells.

Methods

We utilized a peptide that contains two domains, a peptide transduction domain derived from the HIV-1 TAT protein and a biological effector domain, the BH3 domain from the pro-apoptotic Bcl-2 family member Bim. We examined whether this construct (TAT-Bim) induced apoptosis in several cancer cell lines (T-cell lymphoma (EL4), pancreatic cancer (Panc-02), and melanoma (B16)) and whether TAT-Bim treatment synergized with radiation. A mutant TAT-Bim peptide with no biologic activity (TAT-Bim-inactive) was used as a control. C57/BL6 mice were challenged with syngeneic cancer cell lines and the effects of intratumoral TAT-Bim injection on tumor growth and host survival were determined.

Results

TAT-Bim was internalized by all cancer cells within two hours. TAT-Bim resulted in apoptosis in a dose dependent fashion in all cell lines and sublethal irradiation augmented the effects of TAT-Bim induced apoptosis. TAT-Bim significantly slowed tumor growth in murine models of pancreatic cancer and melanoma.

Conclusion

TAT-Bim exemplifies a strategy for cancer therapy that involves inducing apoptosis by antagonizing the endogenous anti-apoptotic machinery. Small peptide therapeutics, in combination with traditional adjuvant therapies such as radiation, may provide a valuable ‘second hit’ and drive tumor cells into programmed cell death.
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Metadaten
Titel
TAT-Bim Induces Extensive Apoptosis in Cancer Cells
verfasst von
Hiroyuki Kashiwagi
Jonathan E. McDunn
Peter S. Goedegebuure
Mary C. Gaffney
Katherine Chang
Kathryn Trinkaus
David Piwnica-Worms
Richard S. Hotchkiss
William G. Hawkins
Publikationsdatum
01.05.2007
Verlag
Springer-Verlag
Erschienen in
Annals of Surgical Oncology / Ausgabe 5/2007
Print ISSN: 1068-9265
Elektronische ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-006-9298-z

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