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Comparative antimutagenic and anticancer activity of three fractions of black tea polyphenols thearubigins

Udayan Bhattacharya1, Sibabrata Mukhopadhyay, Ashok K Giri

  • 1Molecular and Human Genetics Division, Indian Institute of Chemical Biology, Kolkata, India.

Nutrition and Cancer
|September 17, 2011
PubMed

Insights

Black tea polyphenols, thearubigins (TR), were fractionated to assess their health benefits. The TR-2 fraction demonstrated significant antimutagenic and anticancer effects without harming normal cells, suggesting its therapeutic potential.

Area of Science:

  • Food Science
  • Biochemistry
  • Pharmacology

Background:

  • Black tea polyphenols, including theaflavins (TF) and thearubigins (TR), are known for their potential health benefits.
  • Thearubigins (TR) represent a complex mixture of polyphenols with largely uncharacterized biological activities.

Purpose of the Study:

  • To fractionate thearubigins (TR) from black tea.
  • To evaluate the antimutagenic and anticancer properties of isolated TR fractions.
  • To identify the most active TR fraction and investigate its mechanism of action.

Main Methods:

  • Chromatographic separation was used to isolate three fractions (TR-1, TR-2, TR-3) from thearubigins (TR).
  • Antimutagenic activity was assessed using the Ames assay on four Salmonella strains.
  • Anticancer activity was evaluated on human leukemic U937 cells and normal peripheral blood mononuclear cells.
  • Apoptosis induction was studied using flow cytometry and confocal microscopy.

Main Results:

  • All three TR fractions (TR-1, TR-2, TR-3) exhibited significant antimutagenic and anticancer activities.
  • None of the fractions showed significant toxicity to normal human cells at concentrations up to 100 μg/ml.
  • The TR-2 fraction was identified as the most potent among the tested fractions.
  • Apoptosis induction was suggested as a key mechanism underlying the observed anticancer effects.

Conclusions:

  • Fractionation of thearubigins (TR) yields components with distinct biological activities.
  • The TR-2 fraction possesses notable antimutagenic and anticancer properties with a favorable safety profile.
  • This study provides the first evidence for the specific activities of TR fractions, highlighting TR-2 as a promising therapeutic agent.

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