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Theaflavin-3,3'-digallate triggers apoptosis in osteosarcoma cells via the caspase pathway

Yat-Yin Law1,2,3, Yi-Hsien Hsieh1,4, Yih-Shou Hsieh2

  • 1Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan.

Journal of Cancer
|June 19, 2025
PubMed

Insights

Theaflavin-3,3-digallate (TF3) effectively reduces osteosarcoma cell viability and tumor growth. TF3 triggers apoptosis by activating the caspase pathway and modulating key proteins involved in cell death.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Osteosarcoma presents a significant clinical challenge with limited treatment options.
  • Inducing apoptosis in cancer cells is a key therapeutic strategy.
  • Theaflavin-3,3-digallate (TF3), a compound from tea, shows potential anti-cancer effects.

Purpose of the Study:

  • To investigate the apoptotic effects of TF3 on osteosarcoma cells.
  • To elucidate the molecular pathways through which TF3 induces apoptosis.
  • To evaluate TF3's efficacy in an in vivo osteosarcoma model.

Main Methods:

  • Cell viability assays (MTT) on 143B and U2OS osteosarcoma cell lines.
  • Western blot analysis to assess protein expression changes.
  • Establishment of an osteosarcoma xenograft mouse model for in vivo studies.

Main Results:

  • TF3 significantly decreased osteosarcoma cell viability.
  • TF3 upregulated cleaved caspase-3 and caspase-9, indicating caspase pathway activation.
  • TF3 modulated pro-apoptotic (Bax, Bak1) and anti-apoptotic (Mcl-1, survivin) proteins, and increased DNA damage marker (H2Ax).
  • TF3 treatment led to a significant reduction in tumor volume in the xenograft model.

Conclusions:

  • TF3 effectively induces apoptosis in osteosarcoma cells through the intrinsic caspase pathway.
  • TF3 demonstrates therapeutic potential for osteosarcoma treatment.
  • Further research into TF3 as an anti-osteosarcoma agent is warranted.
Keywords:
apoptosiscaspaseosteosarcomareactive oxygen speciestheaflavin-3,3'-digallate

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