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Apoptosis-inducing activity of vitamin C and vitamin K. *

Apoptosis-inducing activity of vitamins C and K and of their analogs are reviewed. Vitamin C shows both reducing and oxidizing activities, depending on the environment in which this vitamin is present. Higher concentrations of vitamin C induce apoptotic cell death in various tumor cell lines including oral squamous cell carcinoma and salivary gland tumor cell lines, possibly via its prooxidant action. The apoptosis-inducing activity of ascorbate is stimulated by Cu2+, lignin and ion chelator, and inhibited by catalase, Fe3+, Co2+ and saliva. On the other hand, at lower concentrations, ascorbic acid displays an antioxidant property, preventing the spontaneous and stress or antitumor agent-induced apoptosis.
Sodium 5,6-benzylidene-L-ascorbate, intravenous administration of which induces degeneration of human inoperable tumors and rat hepatocellular carcinoma in vivo, induces apoptotic or non-apoptotic cell death, depending on the types of target cells. On the other hand, elevation of intracellular concentration of ascorbic acid by treatment with ascorbate 2-phosphate or dehydroascorbic acid makes the cells resistant to the oxidative stress-induced apoptosis. Vitamin K2, which has a geranylgeranyl group as a side chain,and vitamin K3 induces apoptosis of various cultured cells including osteoclasts and osteoblasts, by elevating peroxide and superoxide radicals. Synergistic apoptosis-inducing actions have been found between vitamins C and K, and between these vitamins and antiproliferative agents. The possible therapeutic application of these vitamins is discussed.

* Legal Disclaimer: Chelation and Hyperbaric Therapy, Stem Cell Therapy, and other treatments and modalities mentioned or referred to in this web site are medical techniques that may or may not be considered “mainstream”. As with any medical treatment, results will vary among individuals, and there is no implication or guarantee that you will heal or achieve the same outcome as patients herein.

As with any procedure, there could be pain or other substantial risks involved. These concerns should be discussed with your health care provider prior to any treatment so that you have proper informed consent and understand that there are no guarantees to healing.

THE INFORMATION IN THIS WEBSITE IS OFFERED FOR GENERAL EDUCATIONAL PURPOSES ONLY AND DOES NOT IMPLY OR GIVE MEDICAL ADVICE. No Doctor/Patient relationship shall be deemed to have arisen simply by reading the information contained on these pages, and you should consult with your personal physician/care giver regarding your medical treatment before undergoing any sort of treatment or therapy.

Published on 05-26-2008