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Oligopeptides impairing the Myc-Max heterodimerization inhibit lung cancer cell proliferation by reducing Myc

Igea D'Agnano1, Alessandra Valentini, Giuliana Gatti

  • 1CNR, Istituto di Tecnologie Biomediche, Segrate-Milano, Italy. igea.dagnano@inmm.cnr.it

Journal of Cellular Physiology
|September 26, 2006
PubMed

Insights

Small peptides targeting the Myc-Max interaction inhibit cancer cell growth. A nine-amino acid peptide effectively reduced Myc transcriptional activity in lung cancer cells, offering a potential new cancer therapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • The deregulated CMYC gene drives cell transformation and is linked to cancer progression and poor patient outcomes.
  • The transcription factor Myc, crucial for cell growth, functions by forming heterodimers with its partner, Max.

Purpose of the Study:

  • To develop novel anti-tumoral therapeutics by inhibiting Myc activity.
  • To synthesize and evaluate small peptides targeting the Myc-Max interaction in lung cancer cells.

Main Methods:

  • Synthesis of three small peptides mimicking the leucine zipper (LZ) region of Max.
  • In vitro assessment of peptide efficacy in competing Myc-Max interaction.
  • In vivo evaluation of peptide internalization, cell growth inhibition, and transcriptional activity in lung cancer cell lines.

Main Results:

  • All three synthesized peptides effectively competed the Myc-Max interaction in vitro.
  • Peptides were internalized by lung cancer cells and significantly inhibited cell growth in those with high Myc expression.
  • A specific nine-amino acid peptide demonstrated potent inhibition of Myc transcriptional activity in vivo, indicating a stable interaction.

Conclusions:

  • Small peptides targeting the Myc-Max interaction are effective in inhibiting cancer cell growth.
  • A short, specific peptide shows promise for developing novel therapeutic strategies against Myc-overexpressing tumors.

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