Abstract:
:Emerging studies have shown that mitochondrial DNA (mtDNA) is a potential target for cancer therapy. Herein, six cyclometalated Ir(III) complexes Ir1-Ir6 containing a series of extended planar diimine ligands have been designed and assessed for their efficacy as anticancer agents. Ir1-Ir6 show much higher cytotoxicity than cisplatin and they can effectively localize to mitochondria. Among them, complexes Ir3 and Ir4 with dipyrido[3,2- a:2',3'- c]phenazine (dppz) ligands can bind to DNA tightly in vitro, intercalate to mtDNA in situ, and induce mtDNA damage. Ir3- and Ir4-impaired mitochondria exhibit decline of mitochondrial membrane potential, disability of adenosine triphosphate generation, disruption of mitochondrial energetic and metabolic status, which subsequently cause protective mitophagy, G0/G1 phase cell cycle arrest, and apoptosis. In vivo antitumor evaluations also show that Ir4 can inhibit tumor xenograft growth effectively. Overall, our work proves that targeting the mitochondrial genome may present an effective strategy to develop metal-based anticancer agents to overcome cisplatin resistance.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Cao JJ,Zheng Y,Wu XW,Tan CP,Chen MH,Wu N,Ji LN,Mao ZWdoi
10.1021/acs.jmedchem.8b01704subject
Has Abstractpub_date
2019-04-11 00:00:00pages
3311-3322issue
7eissn
0022-2623issn
1520-4804journal_volume
62pub_type
杂志文章abstract::We present an analysis of the chemical fragments from lead-like ligands in the Protein Data Bank (PDB) that form hydrogen bonds to the side chains of Asp, Glu, Arg, and His, which are the most common residues found in ligand binding sites. A fragment is defined as the largest ring assembly containing the atoms involve...
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journal_title:Journal of medicinal chemistry
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