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A novel assay for discovery and characterization of pro-apoptotic drugs and for monitoring apoptosis in patient sera

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Abstract

We have developed an apoptosis assay based on measurement of a neoepitope of cytokeratin-18 (CK18-Asp396) exposed after caspase-cleavage and detected by the monoclonal antibody M30. The total amount of caspase-cleaved CK18 which has accumulated in cells and tissue culture media during apoptosis is measured by ELISA. The sensitivity is sufficient for use in the 96-well format to allow high-through-put screening of drug libraries. We here describe strategies allowing classification of pro-apoptotic compounds according to their profiles of induction of apoptosis in the presence of pharmacological inhibitors. The time course of induction of CK18 cleavage can furthermore be used to distinguish structurally similar compounds. We propose that compounds that induce rapid CK18 cleavage have mechanisms of actions distinct from conventional genotoxic and microtubuli-targeting agents, and we present one example of an agent that induces almost immediate mitochondrial depolarization and cytochrome c release. Finally, CK18-Asp396 cleavage products are released from cells in tissue culture, and presumably from tumor cells in vivo. These products can be measured in sera from cancer patients. We present evidence suggesting that it will be possible to use the M30-ELISA assay for measuring chemotherapy-induced apoptosis in patient sera, opening possibilities for monitoring therapy.

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Authors and Affiliations

  1. Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Institute and Hospital, Stockholm, Sweden

    K. Bivén, H. Erdal, M. Hägg, T. Ueno, R. Zhou, M. C. Shoshan & S. Linder

  2. Department of Cancer Research, Bayer Pharmaceutical Division, 400 Morgan Lane, West Haven, CT-065156-4175, Connecticut, USA

    M. Lynch, B. Rowley, J. Wood & C. Zhang

  3. Breast Oncology, Tokyo Metropolitan Komagome Hospital, Tokyo, Japan

    M. Toi

Authors
  1. K. Bivén
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  2. H. Erdal
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  3. M. Hägg
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  4. T. Ueno
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  5. R. Zhou
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  6. M. Lynch
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  7. B. Rowley
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  8. J. Wood
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  9. C. Zhang
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  10. M. Toi
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  11. M. C. Shoshan
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  12. S. Linder
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Correspondence to S. Linder.

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Bivén, K., Erdal, H., Hägg, M. et al. A novel assay for discovery and characterization of pro-apoptotic drugs and for monitoring apoptosis in patient sera. Apoptosis 8, 263–268 (2003). https://doi.org/10.1023/A:1023672805949

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  • DOI: https://doi.org/10.1023/A:1023672805949

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