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Diindolylmethane Derivatives: New Selective Blockers for T-Type Calcium Channels.

Dan Wang1,2, Pratik Neupane1, Lotten Ragnarsson1

  • 1Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia.

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Summary
This summary is machine-generated.

Indole-3-carbinol (I3C) derivatives, 3,3'-diindolylmethane (DIM) and DIM-one, selectively block T-type calcium channels. This activity correlates with their anti-proliferative effects on cancer cells, with DIM-one showing preferential activity against colon cancer.

Keywords:
3,3′-diindolylmethaneT-type calcium channelsnatural anticancer agentselective blockers

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Cancer Research

Background:

  • Indole-3-carbinol (I3C) and its metabolite 3,3 '-diindolylmethane (DIM) are natural compounds with demonstrated anti-cancer properties, particularly in breast cancer.
  • T-type calcium channels (CaV channels) are implicated in various physiological processes and have been explored as therapeutic targets in cancer.

Purpose of the Study:

  • To investigate the calcium channel blocking activity of DIM, its derivative DIM-one, and related analogs.
  • To determine the structure-activity relationships of these compounds concerning their effects on T-type CaV channels and cancer cell proliferation.

Main Methods:

  • High-throughput screening using a FLIPR cell-based assay to measure inhibition of T-type calcium channel window current.
  • Electrophysiology to further characterize the effects of DIM and DIM-one on specific CaV channel subtypes.
  • Assessment of anti-proliferative activity against breast (MCF-7) and colon (HT-29) cancer cell lines.

Main Results:

  • DIM, DIM-one, and analog IX were identified as selective blockers of CaV3.3 channels.
  • DIM also inhibited CaV3.1 and CaV3.3 channels, while IX affected CaV3.2 and CaV3.3.
  • DIM-one preferentially blocked CaV3.1 channels. Oxidation of DIM altered its selectivity from breast to colon cancer cells.

Conclusions:

  • DIM and its derivatives exhibit selective T-type calcium channel blocking activities.
  • The observed anti-proliferative effects are linked to calcium channel modulation.
  • DIM-one demonstrates potential as a selective agent against colon cancer.