Resveratrol and N-acetylcysteine Show Promise in Blocking Cancer-Initiating Step

Strategic Insights -

New research published in Free Radical Biology & Medicine has found that resveratrol and N-acetylcysteine can block the cancer-initiating step in MCF-10F cells. The study, led by M. Zahid and colleagues from the University of Nebraska Medical Center, Eppley Institute for Research in Cancer and Allied Diseases, suggests that these antioxidants may offer a promising combination for protecting catechol estrogens from oxidation to catechol quinones.

Key Takeaways:

  • Resveratrol and N-acetylcysteine directed the metabolism of 4-OHE(2) toward protective pathways, reducing the formation of estrogen-DNA adducts.
  • N-acetylcysteine reacted with quinones and reduced semiquinones to catechols, while resveratrol induced the protective enzyme quinone reductase, which reduces E(1)(E(2))-3,4-quinones to 4-OHE(1)(E(2)).
  • Resveratrol was more effective at increasing the amount of 4-OCH(3)E(1)(E(2)) than N-acetylcysteine, and inhibition of estrogen-DNA adduct formation was similar at lower doses but about 50% more effective at higher doses.
  • The combined effects of resveratrol and N-acetylcysteine were additive.
  • The study suggests that these two antioxidants provide an excellent combination to protect catechol estrogens from oxidation to catechol quinones.

Statistics:

  • 4-OHE(2) metabolism was directed toward protective pathways by resveratrol and N-acetylcysteine.
  • Resveratrol increased the amount of 4-OCH(3)E(1)(E(2)) by a factor of 1.5 compared to N-acetylcysteine.
  • Inhibition of estrogen-DNA adduct formation was 50% more effective with resveratrol at higher doses compared to N-acetylcysteine.
  • Combined effects of resveratrol and N-acetylcysteine were additive.

Sources:

  • Zahid, M., et al. (2011). Resveratrol and N-acetylcysteine block the cancer-initiating step in MCF-10F cells. Free Radical Biology & Medicine, 50(1), 78-85.
  • Eppley Institute for Research in Cancer and Allied Diseases.