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Systematic Chemical Mutagenesis Identifies a Potent Novel Apratoxin A/E Hybrid with Improved in Vivo Antitumor

Qi-Yin Chen1, Yanxia Liu, Hendrik Luesch

  • 1Department of Medicinal Chemistry, University of Florida , Gainesville, Florida 32610, United States.

ACS Medicinal Chemistry Letters
|November 15, 2011
PubMed

Insights

Apratoxins, marine natural products, inhibit cancer cell growth by blocking protein transport and downregulating key receptors. Medicinal chemistry efforts yielded a potent, less toxic inhibitor with demonstrated efficacy in preclinical models.

Area of Science:

  • Marine Natural Products Chemistry
  • Cancer Biology
  • Drug Discovery

Background:

  • Apratoxins are marine natural products with cytotoxic properties.
  • They function by inhibiting cotranslational translocation in the secretory pathway.
  • This mechanism offers a novel approach to targeting cancer cells, especially those dependent on autocrine signaling loops.

Purpose of the Study:

  • To investigate the structure-activity relationships of apratoxins.
  • To identify modifications that enhance potency and reduce toxicity.
  • To evaluate the therapeutic potential of novel apratoxin derivatives in cancer models.

Main Methods:

  • Total synthesis of apratoxins and their analogs.
  • Alanine scanning and epimerization studies to probe structure-activity relationships.
  • Assessment of receptor tyrosine kinase and vascular endothelial growth factor A (VEGF-A) downregulation.
  • In vivo efficacy testing in a colorectal tumor xenograft model.

Main Results:

  • Apratoxins were found to downregulate critical receptors and growth factor ligands, impacting cancer cell proliferation.
  • Structural modifications, including amino acid substitutions, influenced the selectivity of secretion inhibition.
  • A novel apratoxin derivative demonstrated significant in vivo efficacy against colorectal tumors.
  • This derivative exhibited reduced toxicity compared to apratoxin A.

Conclusions:

  • Apratoxins represent a promising class of compounds targeting the secretory pathway for cancer therapy.
  • Structural optimization can lead to potent and selective inhibitors with improved therapeutic profiles.
  • The developed apratoxin analog shows potential for clinical development due to its efficacy and safety in preclinical studies.

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