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Formosanin C suppresses cancer cell proliferation and migration by impeding autophagy machinery

Man-Ling Chu1, Pei-Wen Lin1, Yu-Wen Liu1

  • 1M.Sc. Program in Tropical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.

The Kaohsiung Journal of Medical Sciences
|March 3, 2023
PubMed

Insights

Formosanin C (FC) is a natural compound that both induces and blocks autophagy, leading to cancer cell apoptosis and reduced motility. This dual action highlights FC

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Formosanin C (FC), a natural compound from Paris formosana Hayata, exhibits anticancer properties.
  • FC is known to induce autophagy and apoptosis in human lung cancer cells.
  • FC-induced mitochondrial membrane potential (MMP) depolarization suggests potential mitophagy involvement.

Purpose of the Study:

  • To elucidate the effects of FC on autophagy and mitophagy.
  • To investigate the role of autophagy in FC-mediated cancer cell death and motility.
  • To clarify the dual role of FC in autophagic progression.

Main Methods:

  • Treatment of lung and colon cancer cells with FC.
  • Analysis of autophagosome markers (LC3 II) and autophagic flux.
  • Assessment of mitochondrial membrane potential (MMP) and mitophagy markers (COX IV, p-Parkin).
  • Confocal microscopy to detect colocalization of LC3 with mitochondrial markers.
  • Evaluation of cell proliferation, motility, apoptosis, and EMT pathways.

Main Results:

  • FC treatment led to a continuous increase in LC3 II without degradation, indicating blocked autophagic progression, while also inducing early-stage autophagy.
  • FC increased MMP and upregulated COX IV and p-Parkin, but no LC3 colocalization with these markers was observed, suggesting disrupted mitochondria dynamics rather than direct mitophagy induction.
  • FC suppressed cell proliferation and motility via apoptosis and EMT pathways, respectively.

Conclusions:

  • FC acts as both an inducer and a blocker of autophagy, contributing to cancer cell apoptosis and reduced motility.
  • FC disrupts mitochondria dynamics, a mechanism requiring further investigation.
  • FC shows potential for combined therapeutic strategies with existing anticancer drugs.
Keywords:
autophagyformosanin Clung cancermitophagy

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