Plant Foods for Human Nutrition

, Volume 57, Issue 1, pp 53–61 | Cite as

Vitamin C and quercetin modulate DNA-damaging effect of N-methyl-N′-nitro-N-nitrosoguanidine (MNNG)

  • J. Błasiak
  • A. Trzeciak
  • A. Gąsiorowska
  • J. Drzewoski
  • E. Małecka-Panas


The effects of natural compounds, vitamin C and quercetin, present in fruitsand vegetables, on the DNA damaging activity of a food carcinogen N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) were examinedusing the comet assay. Vitamin C, at a concentration of 50 μM,inhibited MNNG-induced DNA damage in human lymphocytes. Quercetin,up to a concentration of 10 μM, increased the extent of DNA damage,but at concentrations above 10 μM decreased damage below controlvalues. Furthermore, quercetin had a strong antioxidant activity againstoxidative damage evoked by H2O2 at 10 μM. The resultsobtained suggest that vitamin C and quercetin may have anti- orpro-oxidative properties depending on the state of the cell.

Comet assay DNA damage Lymphocytes MNNG Quercetin Vitamin C 


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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • J. Błasiak
    • 1
  • A. Trzeciak
    • 1
  • A. Gąsiorowska
    • 2
  • J. Drzewoski
    • 2
  • E. Małecka-Panas
    • 2
  1. 1.Department of Molecular GeneticsUniversity of LodzLodzPoland
  2. 2.Department of Digestive Tract Diseases and Metabolic DisturbancesMedical University of LodzLodzPoland

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