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Ring-substituted analogs of 3,3′-diindolylmethane (DIM) induce apoptosis and necrosis in androgen-dependent and –independent prostate cancer cells

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Summary

We recently reported that novel ring-substituted analogs of 3,3′-diindolylmethane (ring-DIMs) have anti-androgenic and growth inhibitory effects in androgen-dependent prostate cancer cells. The objectives of this study were to confirm the ability of 4,4′- and 7,7′-dibromo- and dichloro-substituted ring-DIMs to inhibit androgen-stimulated proliferation of androgen-dependent LNCaP human prostate cancer cells using a non-invasive, real-time monitoring technique. In addition, their ability to induce apoptotic and necrotic cell death in androgen-dependent as well as -independent (PC-3) prostate cancer cells was studied. Prostate cancer cells were treated with increasing concentrations of DIM and ring-DIMs (0.3–30 μM) and effects on cell proliferation were measured in real-time using an xCELLigence cellular analysis system. Chromatin condensation and loss of membrane integrity were determined by Hoechst and propidium iodide staining, respectively. Apoptotic protein markers were measured by immunoblotting and activation of caspases determined using selective fluorogenic substrates. Intra- and extracellular concentrations of DIM and ring-DIMs were assessed by electrospray ionization tandem mass spectrometry. Ring-DIMs inhibited androgen-stimulated LNCaP cell proliferation and induced apoptosis and necrosis in LNCaP and PC-3 cells with 2–4 fold greater potencies than DIM. DIM and the ring-DIMs increased caspases −3, −8 and −9 activity, elevated expression of Fas, FasL, DR4 and DR5 protein, and induced PARP cleavage in both cell lines. The cytotoxicity of the most potent ring-DIM, 4,4′-dibromoDIM, but not the other compounds was decreased by an inhibitor of caspase −3. The 4,4′-dibromoDIM was primarily found in the extracellular medium, whereas all other compounds were present to a much larger extent in the cell. In conclusion, ring-DIMs inhibited prostate cancer cell growth and induced cell death in LNCaP and PC-3 cells with greater potencies than DIM; they also structure-dependently activated different cell death pathways suggesting that these compounds have clinical potential as chemopreventive and chemotherapeutic agents in prostate cancer, regardless of hormone-dependency.

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Acknowledgments

This work was made possible by an operating grant from the Canadian Institutes of Health Research (CIHR grant no. MOP-115019). The authors declare to have no conflict of interest.

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Authors and Affiliations

  1. INRS – Institut Armand-Frappier, Université du Québec, 531 boulevard des Prairies, Laval, QC, Canada

    A. A. Goldberg, K. Abdelbaqi & J. T. Sanderson

  2. Department of Biology, Concordia University, Montreal, QC, Canada

    V. I. Titorenko & A. Beach

  3. Veterinary Physiology and Pharmacology, A&M University, College Station, TX, USA

    S. Safe

  4. Institute for Bioscience and Technology, Houston, TX, USA

    S. Safe

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  1. A. A. Goldberg
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  4. K. Abdelbaqi
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  6. J. T. Sanderson
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Correspondence to J. T. Sanderson.

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Goldberg, A.A., Titorenko, V.I., Beach, A. et al. Ring-substituted analogs of 3,3′-diindolylmethane (DIM) induce apoptosis and necrosis in androgen-dependent and –independent prostate cancer cells. Invest New Drugs 32, 25–36 (2014). https://doi.org/10.1007/s10637-013-9979-y

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  • DOI: https://doi.org/10.1007/s10637-013-9979-y

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