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Flavonoids activate wild-type p53

B Plaumann1, M Fritsche, H Rimpler

  • 1Abteilung Virologie, Institut für Medizinische Mikrobiologie and Hygiene der Universität, Frieburg, Germany.

Oncogene
|October 17, 1996
PubMed
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Flavonoids like apigenin, luteolin, and quercetin induce tumor suppressor protein p53 accumulation and apoptosis in cells. This suggests a p53-dependent role for flavonoids in controlling cell cycle arrest and tumor growth inhibition.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Flavonoids, found in edible plants, exhibit a dual role in cancer, acting as both anticarcinogens and potential carcinogens.
  • Their influence on cellular processes like mutagenesis and carcinogenesis necessitates further investigation.

Purpose of the Study:

  • To investigate the impact of specific flavonoids (apigenin, luteolin, quercetin) on the tumor suppressor protein p53.
  • To elucidate the effects on p53 accumulation, cell cycle arrest, apoptosis, and biological activity.

Main Methods:

  • Incubation of non-tumour cell line C3H10T1/2CL8 with apigenin, luteolin, and quercetin.
  • Analysis of p53 accumulation, cell cycle progression, and apoptosis induction.
  • Comparison with p53 knockout fibroblasts to assess p53 dependency.

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Main Results:

  • Flavonoid treatment induced p53 accumulation and apoptosis in C3H10T1/2CL8 cells.
  • Apoptosis occurred outside the G2/M phase, and G2/M arrest was found to be p53-dependent.
  • Observed differences in p53 accumulation kinetics and biological activity among the tested flavonoids.

Conclusions:

  • The tumor suppressor protein p53 is functionally linked to flavonoid-induced cell cycle arrest and apoptosis.
  • Flavonoids' effects on inhibiting tumor growth and inducing apoptosis are mediated through p53.
  • The study highlights the complex, p53-mediated mechanisms underlying flavonoid actions in cancer research.