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Enediyne-activated, EGFR-targeted human β-defensin 1 has therapeutic efficacy against non-small cell lung carcinoma

Wen-Juan Liu1, Kun-Li Zhu2, Jian Xu3

  • 1Shandong Provincial Key Laboratory of Radiation Oncology, Shandong Cancer Hospital and Institute, Shandong Cancer Hospital affiliated to Shandong University, Shandong Academy of Medical Sciences, Jinan, 250117, China.

Laboratory Investigation; a Journal of Technical Methods and Pathology
|September 13, 2018
PubMed

Insights

A novel fusion protein, Ec-LDP(AE)-DF, targets lung cancer cells by leveraging human beta-defensin-1 and an EGFR-targeting peptide. This potent agent induces apoptosis and inhibits tumor growth in preclinical models.

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Development

Background:

  • Human beta-defensins (HBDs) possess oncolytic properties, with a fragment of HBD1 (DF) showing antitumor effects.
  • Targeted drug delivery using fusion proteins can enhance therapeutic efficacy, but this approach has not been explored for HBDs.
  • Epidermal growth factor receptor (EGFR) is a validated target in non-small cell lung cancer (NSCLC).

Purpose of the Study:

  • To design and synthesize a novel fusion protein incorporating an HBD1 fragment (DF), an EGFR-targeting oligopeptide (Ec), and lidamycin (LDM).
  • To evaluate the efficacy and mechanism of action of the fusion protein, particularly its enediyne-integrated analog (Ec-LDP(AE)-DF), against NSCLC.
  • To assess the potential of Ec-LDP(AE)-DF as a targeted therapeutic agent for NSCLC.

Main Methods:

  • Construction and purification of fusion proteins: Ec-LDP-DF and Ec-LDP(AE)-DF.
  • In vitro studies: Cytotoxicity assays on NSCLC cell lines, cell cycle analysis, apoptosis induction, and assessment of EGFR phosphorylation.
  • In vivo studies: Treatment of human lung carcinoma xenografts in athymic mice to evaluate tumor growth inhibition and tolerability.

Main Results:

  • The fusion protein Ec-LDP-DF effectively bound to EGFR-expressing tumor cells.
  • The enediyne-energized fusion protein Ec-LDP(AE)-DF demonstrated extremely potent cytotoxicity against NSCLC cell lines (IC50 < 10-10 M).
  • Ec-LDP(AE)-DF significantly inhibited xenograft tumor growth in mice at well-tolerated doses, inducing cell cycle arrest and apoptosis in a dose-dependent manner, and abolished EGF-stimulated EGFR phosphorylation.

Conclusions:

  • The novel fusion protein Ec-LDP(AE)-DF is a highly potent and targeted therapeutic agent for NSCLC.
  • This agent effectively inhibits tumor growth by inducing cell cycle arrest and apoptosis and by targeting EGFR signaling.
  • Ec-LDP(AE)-DF represents a promising new strategy for NSCLC treatment, building upon the oncolytic potential of defensins.

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