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Development of Mitochondria-Targeted PARP Inhibitors.

Pavels Dimitrijevs1, Marina Makrecka-Kuka1, Pavel Arsenyan1

  • 1Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia.

Biomolecules
|January 28, 2026
PubMed
Summary

Researchers developed novel mitochondria-targeted PARP inhibitors by conjugating existing drugs with phosphonium. These new compounds show enhanced potency against BRCA1-deficient breast cancer cells while maintaining selectivity.

Keywords:
PARP inhibitorscardiolipin bindingmitochondrial targetingolaparibphosphonium conjugatesrucaparib

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Area of Science:

  • Oncology
  • Medicinal Chemistry
  • Mitochondrial Biology

Background:

  • Poly(ADP-ribose) polymerase (PARP) inhibitors are established anticancer drugs targeting homologous recombination-deficient (HRD) tumors.
  • Targeting mitochondria for organelle-specific drug action remains a challenge.
  • Developing mitochondria-targeted PARP inhibitors could improve efficacy and overcome resistance in HRD cancers.

Purpose of the Study:

  • To design and synthesize novel mitochondria-targeted PARP inhibitors.
  • To evaluate their ability to selectively accumulate in mitochondria and modulate PARP activity.
  • To assess their anticancer efficacy and selectivity.

Main Methods:

  • Synthesis of trialkyl(aryl)phosphonium conjugates of olaparib and rucaparib.
  • Evaluation of PARP1 inhibition, cardiolipin binding affinity, and cytotoxicity in BRCA1-deficient breast cancer cells (HCC1937) and non-malignant cardiomyocytes (H9C2).

Main Results:

  • Conjugates retained potent PARP1 inhibition (IC50 = 3.4-17 nM).
  • Specific derivatives (2d, 6c) showed strong cardiolipin binding and enhanced cytotoxicity in HCC1937 cells (IC50 = 0.93, 2.01 µM), outperforming parent drugs.
  • Reduced cytotoxicity in H9C2 cells indicated a favorable selectivity profile.

Conclusions:

  • Phosphonium conjugation successfully confers mitochondrial targeting to PARP inhibitors.
  • Mitochondria-targeted PARP inhibitors demonstrate enhanced anticancer potency and selectivity.
  • This strategy holds promise for next-generation therapeutics against HR-deficient tumors, potentially improving efficacy and overcoming resistance.