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Small molecule Hedgehog pathway antagonists.

Trieu N Trinh1, Eileen A McLaughlin2, Christopher P Gordon3

  • 1Chemistry, Priority Research Centre for Chemical Biology, University of Newcastle, University Drive Callaghan, NSW 2308, Australia. Adam.McCluskey@newcastle.edu.au.

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Summary
This summary is machine-generated.

Researchers developed novel Hedgehog signaling pathway (HSP) inhibitors using l-tryptophan and amine scaffolds. These compounds effectively modulate Gli expression, offering new therapeutic strategies for HSP-related conditions.

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • The Hedgehog signaling pathway (HSP) plays a crucial role in embryonic development and is implicated in various cancers.
  • Quinolone-1-(2H)-one derivatives have previously shown potential as HSP inhibitors.
  • Targeting Gli transcription factors is a key strategy for modulating HSP activity.

Purpose of the Study:

  • To develop novel classes of HSP inhibitors based on l-tryptophan and benzo[1,3]dioxol-5-ylmethyl-[2-(1H-indol-3-yl)-ethyl]-amine scaffolds.
  • To identify compounds that inhibit Gli expression and downstream HSP targets.
  • To characterize the inhibitory mechanism of newly synthesized compounds.

Main Methods:

  • Synthesis of focused compound libraries based on l-tryptophan and benzo[1,3]dioxol-5-ylmethyl-[2-(1H-indol-3-yl)-ethyl]-amine scaffolds.
  • Inhibition assays to evaluate Gli activity at a 10 μM compound concentration.
  • Quantitative real-time PCR to measure mRNA expression of Ptch1 and Gli2 in Shh LIGHT2 cells.
  • In vitro assays to determine IC50 values and assess direct interaction with Smo.

Main Results:

  • Six l-tryptophan based inhibitors and two stimulators of Gli were identified.
  • Compounds 2,4-dichloro-13 and indole 16 modulated Ptch1 and Gli2 mRNA expression.
  • Two potent sub-micromolar inhibitors (compounds 29 and 30) of Gli expression were discovered, with IC50 values of 0.5 μM and 0.24 μM, respectively.
  • Compounds 29 and 30 demonstrated inhibition downstream of Smo, not directly on Smo.

Conclusions:

  • Novel HSP inhibitors based on l-tryptophan and benzo[1,3]dioxol-5-ylmethyl-[2-(1H-indol-3-yl)-ethyl]-amine scaffolds were successfully developed.
  • Compounds 29 and 30 represent promising lead compounds for further investigation in HSP-targeted therapies.
  • The identified inhibitors act downstream of Smo, providing new insights into HSP pathway modulation.