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Polyamine transport inhibitors: design, synthesis, and combination therapies with difluoromethylornithine

Aaron Muth1, Meenu Madan, Jennifer Julian Archer

  • 1Department of Chemistry, University of Central Florida , 4000 Central Florida Boulevard, Orlando, Florida 32816-2366, United States.

Journal of Medicinal Chemistry
|January 11, 2014
PubMed

Insights

Researchers developed novel polyamine transport inhibitors (PTIs) combined with difluoromethylornithine (DFMO) to deplete cancer cells of polyamines. The optimal PTI design showed high potency in inhibiting spermidine uptake, offering a promising cancer therapy.

Area of Science:

  • Biochemistry
  • Cancer Biology
  • Medicinal Chemistry

Background:

  • Polyamines are essential for cell growth and are often overexpressed in cancer.
  • Targeting polyamine metabolism, through biosynthesis inhibition (DFMO) and transport inhibition (PTIs), is a strategy for cancer therapy.
  • Previous PTIs showed limitations in potency and stability.

Purpose of the Study:

  • To design and synthesize novel substituted benzene-based polyamine transport inhibitors (PTIs).
  • To evaluate the efficacy of these PTIs in combination with difluoromethylornithine (DFMO) against cancer cells.
  • To identify key structural features influencing PTI activity and stability.

Main Methods:

  • Synthesis of a series of substituted benzene derivatives with varying polyamine chain modifications.
  • Inhibition assays measuring spermidine uptake in DFMO-treated Chinese hamster ovary (CHO) and L3.6pl human pancreatic cancer cells.
  • Assessment of PTI sensitivity to amine oxidases and cytotoxicity.

Main Results:

  • Several design features, including polyamine chain number, sequence, linkage, and N-methylation, significantly impacted PTI performance.
  • The optimal compound, N(1),N(1'),N(1″)-(benzene-1,3,5-triyltris(methylene))tris(N(4)-(4-(methylamino)butyl)butane-1,4-diamine (6b), featured three N-methylhomospermidine motifs.
  • Compound 6b demonstrated high potency (EC50 = 1.4 μM) in inhibiting spermidine uptake, with reduced sensitivity to amine oxidases and low toxicity.

Conclusions:

  • The developed N-methylhomospermidine-based PTI (6b) is a potent inhibitor of polyamine transport.
  • This optimized PTI, when combined with DFMO, offers a promising strategy for targeting cancers with high polyamine dependency.
  • Structural modifications are crucial for enhancing PTI efficacy and overcoming resistance mechanisms.

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