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Heme Binding Biguanides Target Cytochrome P450-Dependent Cancer Cell Mitochondria.

Cell chemical biology | 2017

The mechanisms by which cancer cell-intrinsic CYP monooxygenases promote tumor progression are largely unknown. CYP3A4 was unexpectedly associated with breast cancer mitochondria and synthesized arachidonic acid (AA)-derived epoxyeicosatrienoic acids (EETs), which promoted the electron transport chain/respiration and inhibited AMPKα. CYP3A4 knockdown activated AMPKα, promoted autophagy, and prevented mammary tumor formation. The diabetes drug metformin inhibited CYP3A4-mediated EET biosynthesis and depleted cancer cell-intrinsic EETs. Metformin bound to the active-site heme of CYP3A4 in a co-crystal structure, establishing CYP3A4 as a biguanide target. Structure-based design led to discovery of N1-hexyl-N5-benzyl-biguanide (HBB), which bound to the CYP3A4 heme with higher affinity than metformin. HBB potently and specifically inhibited CYP3A4 AA epoxygenase activity. HBB also inhibited growth of established ER+ mammary tumors and suppressed intratumoral mTOR. CYP3A4 AA epoxygenase inhibition by biguanides thus demonstrates convergence between eicosanoid activity in mitochondria and biguanide action in cancer, opening a new avenue for cancer drug discovery.

Pubmed ID: 28919040 RIS Download

Associated grants

  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM037922
  • Agency: NCI NIH HHS, United States
    Id: P30 CA077598
  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM110790
  • Agency: NIDDK NIH HHS, United States
    Id: P01 DK038226
  • Agency: NCATS NIH HHS, United States
    Id: UL1 TR000114
  • Agency: NCI NIH HHS, United States
    Id: R01 CA157971
  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM057353
  • Agency: NIEHS NIH HHS, United States
    Id: P30 ES013508
  • Agency: NCATS NIH HHS, United States
    Id: UL1 TR000135
  • Agency: NHLBI NIH HHS, United States
    Id: R25 HL088728
  • Agency: NIGMS NIH HHS, United States
    Id: R35 GM118030
  • Agency: NHLBI NIH HHS, United States
    Id: U01 HL117664
  • Agency: NCI NIH HHS, United States
    Id: P30 CA016520
  • Agency: NIGMS NIH HHS, United States
    Id: R35 GM118145
  • Agency: NCI NIH HHS, United States
    Id: F31 CA177119
  • Agency: NIEHS NIH HHS, United States
    Id: R01 ES025767
  • Agency: NCI NIH HHS, United States
    Id: R01 CA113570

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