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Antagonizing STAT3 dimerization with a rhodium(III) complex.

Dik-Lung Ma1, Li-Juan Liu, Ka-Ho Leung

  • 1Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong (China). edmondma@hkbu.edu.hk.

Angewandte Chemie (International Ed. in English)
|June 4, 2014
PubMed
Summary
This summary is machine-generated.

Kinetically inert rhodium complexes show potential as cancer drugs by inhibiting signal transducer and activator of transcription 3 (STAT3) dimerization. These novel compounds demonstrated significant anti-tumor activity in melanoma mouse models.

Keywords:
antitumor agentscytotoxicitydimerizationprotein-protein interactionsrhodium

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Area of Science:

  • Organometallic Chemistry
  • Medicinal Chemistry
  • Cancer Biology

Background:

  • Platinum and ruthenium complexes are established chemotherapeutics.
  • Kinetically inert metal complexes offer alternative therapeutic strategies.
  • Signal transducer and activator of transcription 3 (STAT3) is a key regulator in cancer development.

Purpose of the Study:

  • To explore substitutionally inert Group 9 organometallic compounds as direct inhibitors of STAT3 dimerization.
  • To identify potent STAT3 inhibitors from a series of cyclometalated rhodium(III) and iridium(III) complexes.
  • To evaluate the anti-tumor efficacy of identified STAT3 inhibitors in preclinical models.

Main Methods:

  • Synthesis and characterization of cyclometalated rhodium(III) and iridium(III) complexes.
  • In vitro assays to assess STAT3 inhibition, including SH2 domain targeting, phosphorylation, and dimerization.
  • In vivo evaluation of anti-tumor activity using a mouse xenograft model of melanoma.

Main Results:

  • A specific rhodium(III) complex was identified as a potent inhibitor of STAT3.
  • The rhodium(III) complex directly targeted the STAT3 SH2 domain, inhibiting its phosphorylation and dimerization.
  • The rhodium(III) complex demonstrated significant anti-tumor activity in a melanoma xenograft model.

Conclusions:

  • Substitutionally inert rhodium(III) complexes can effectively inhibit STAT3.
  • Rhodium(III) complexes targeting STAT3 represent a promising new class of anti-cancer agents.
  • These findings support the development of rhodium complexes as novel chemotherapeutics with potent anti-tumor activity.