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Copper pyrithione complexes with endoplasmic reticulum localisation showing anticancer activity via ROS generation.

Atreyee Mishra1, Dominic J Black1, Thomas S Bradford1

  • 1Durham University, Department of Chemistry Durham DH1 3LE UK james.walton@durham.ac.uk.

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|October 16, 2025
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New copper pyrithione derivatives show significantly higher anticancer activity than cisplatin against pancreatic and breast cancer. These novel compounds generate reactive oxygen species (ROS) and exhibit selective toxicity, offering a promising alternative to platinum-based drugs.

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Area of Science:

  • Medicinal Chemistry
  • Oncology
  • Materials Science

Background:

  • Platinum-based chemotherapy agents, while effective, suffer from significant systemic toxicity.
  • Copper complexes present a viable alternative due to potentially lower toxicity profiles.
  • Copper pyrithione demonstrated early anticancer potential but requires further investigation.

Purpose of the Study:

  • To synthesize and evaluate novel copper pyrithione derivatives for enhanced anticancer efficacy.
  • To assess the selectivity of these derivatives against cancer cell lines compared to healthy cells.
  • To elucidate the mechanism of action, including reactive oxygen species (ROS) generation and cellular localization.

Main Methods:

  • Synthesis of a series of copper pyrithione derivatives.
  • In vitro evaluation of cytotoxicity against pancreatic and breast cancer cell lines.
  • Assessment of selectivity against non-cancerous cell lines.
  • Analysis of reactive oxygen species (ROS) generation.
  • Utilizing a fluorescent analogue for cellular localization studies.

Main Results:

  • Copper pyrithione derivatives exhibited 1-2 orders of magnitude higher activity than cisplatin.
  • The compounds demonstrated good selectivity, sparing healthy cells.
  • Reactive oxygen species (ROS) generation was identified as a probable mechanism of action.
  • A fluorescent analogue localized to the endoplasmic reticulum, an unusual target for metal-based therapeutics.

Conclusions:

  • Novel copper pyrithione derivatives represent a highly promising class of anticancer agents.
  • These compounds offer superior efficacy and selectivity compared to cisplatin.
  • The unique endoplasmic reticulum localization suggests novel therapeutic strategies and warrants further investigation.