Cited by 132Bioactive Compounds and Antitumor AgentsAntioxidant Activity and Oxidative StressVitamin K Research Studies

Oxygen free radical generating mechanisms in the colon: do the semiquinones of vitamin K play a role in the aetiology of colon cancer?

Valko, Marián, Morris, Harry, Mazúr, Milan, Rapta, Peter, Bilton, Rodney F·2001·Biochimica et Biophysica Acta (BBA) - General Subjects

Abstract

It is proposed that bile acids (deoxycholic acid), the K vitamins, iron(II) complexes and oxygen interact to induce an oncogenic effect in the colon by the generation of free radicals. In the relatively low oxidising/reducing conditions of the colonic lumen the K vitamins exist in the reduced form; however, if absorbed into the mucosa they have the capacity to be chemically oxidised and to enter into a redox cycle yielding oxygen radicals. The semiquinone radical of K(1) (phylloquinone) has been stabilised in bile acid mixed micelles and investigated by electron paramagnetic resonance spectroscopy and quantum chemical calculations. The estimated half-life of the radical was about 30 min which confirms a remarkably high stability in aqueous micellar solution. A model is presented in which the reduced K vitamins may initiate superoxide radical, O2(-*) generation leading to Fe(II) mediated Fenton reactions in the stem colon cells.

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Crossref · 10.1016/s0304-4165(01)00163-5

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Authors
Valko, M., Morris, H., Mazúr, M., Rapta, P., & Bilton, R. F.
Affiliations
  • Slovak University of Technology in Bratislava (SK)
  • Liverpool John Moores University (GB)
Corresponding author
Valko, Marián
Venue
Biochimica et Biophysica Acta (BBA) - General Subjects
Publisher
Elsevier BV
Published
2001-08
Volume
1527
Issue
3
Pages
161-166
ISSN
0304-4165 (ISSN-L)
OpenAlex
W2006276599
Cited by
124
References
30
Citations by year
2026: 5 · 2025: 3 · 2024: 2 · 2023: 3 · 2022: 2 · 2021: 2 · 2020: 6 · 2019: 5 · 2018: 4 · 2017: 6 · 2016: 5 · 2015: 12 · 2014: 11 · 2013: 12 · 2012: 11
FWCI
1.24
Type
journal article
Language
en
Open access
closed
Locations
  • Biochimica et Biophysica Acta (BBA) - General Subjects (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ministry of Education and Science (1/733/93)
  • North West Cancer Research
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Bioactive Compounds and Antitumor Agents
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
  • Health Sciences › Nursing › Nutrition and Dietetics › Vitamin K Research Studies
Keywords
oxygen free radicals, colon cancer, vitamin K, vitamin K1, semiquinone, bile acids, deoxycholic acid, iron(II) complexes, Fenton reaction, superoxide, redox cycling, colonic mucosa, radical stability, mixed micelles
MeSH terms
Bile Acids and Salts, Colon, Colonic Neoplasms, Diet, Electron Spin Resonance Spectroscopy, Half-Life, Humans, Intestinal Mucosa, Micelles, Models, Chemical, Oxidation-Reduction, Vitamin K 1, Quinones, Superoxides, Vitamin K, Molecular Structure

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