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George R Pettit1, Noeleen Melody1, Jean-Charles Chapuis1

  • 1Department of Chemistry and Biochemistry , Arizona State University , P.O. Box 871604, Tempe , Arizona 85287-1604 , United States.

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Researchers explored isoquinstatins as potential anticancer agents, modifying dolastatin 10. Some isoquinstatins showed potent cancer cell growth inhibition, with one derivative proving significantly more effective than its analogue.

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Cancer Research

Background:

  • Dolastatin 10 is a potent anticancer agent and the parent molecule of the antibody drug conjugate (ADC) Adcetris.
  • Previous studies explored quinoline-type structural modifications of dolastatin 10, leading to quinstatins.
  • Antibody drug conjugates (ADCs) represent a successful therapeutic strategy in cancer treatment.

Purpose of the Study:

  • To extend the study of quinstatins by replacing the quinoline ring with an isoquinoline moiety.
  • To synthesize novel isoquinstatins and their N-terminal desmethyl derivatives.
  • To prepare linker-desmethylisoquinstatin conjugates for potential monoclonal antibody attachment.

Main Methods:

  • Synthesis of isoquinstatins (4-6) and N-terminal desmethylisoquinstatins (7-9).
  • Conjugation of desmethylisoquinstatins to linker units to form conjugates (11-13).
  • In vitro evaluation of isoquinstatins against six human cancer cell lines, determining GI50 values.

Main Results:

  • Isoquinstatins exhibited GI50 values comparable to or slightly higher than their quinstatin counterparts.
  • Desmethylisoquinstatin 5 (7) demonstrated significantly greater potency than its desmethylquinstatin 5 analogue.
  • Isoquinstatin 8 (6) showed slightly less potency compared to its quinstatin 8 counterpart.
  • The evaluated isoquinstatins acted as potent inhibitors of cancer cell growth.

Conclusions:

  • The replacement of the quinoline ring with an isoquinoline in dolastatin 10 analogues yields potent anticancer agents.
  • Specific structural modifications, such as N-terminal demethylation, can enhance cytotoxic potency.
  • Isoquinstatins represent a promising class of compounds for further development in cancer therapy, including potential use in ADCs.