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Related Concept Videos

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Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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Selenium Modulates Cancer Cell Response to Pharmacologic Ascorbate.

Connor S R Jankowski1,2,3, Joshua D Rabinowitz2,3,4

  • 1Department of Molecular Biology, Princeton University, Princeton, New Jersey.

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This summary is machine-generated.

High-dose vitamin C (ascorbate) kills cancer cells via hydrogen peroxide, not dehydroascorbate. Selenium protects against this effect, and its deficiency enhances vitamin C

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Area of Science:

  • Redox biology
  • Cancer therapy
  • Nutritional biochemistry

Background:

  • High-dose ascorbate (vitamin C) exhibits anticancer properties.
  • Proposed mechanisms include hydrogen peroxide generation or glutathione depletion.
  • The precise redox mechanisms and modulators are not fully elucidated.

Purpose of the Study:

  • To elucidate the specific redox mechanisms underlying high-dose ascorbate's anticancer effects.
  • To investigate the role of selenium in mediating ascorbate's cytotoxicity and anticancer activity.
  • To explore the potential of dietary selenium modulation for enhancing cancer therapy.

Main Methods:

  • In vitro studies assessing ascorbate's metabolic effects and cytotoxicity.
  • Investigation of selenium's modulatory role using selenoenzymes (GPX1, GPX4) and NADPH.
  • In vivo experiments using dietary selenium deficiency in glioblastoma xenograft mouse models.

Main Results:

  • Ascorbate's cytotoxic and metabolic effects are mediated by hydrogen peroxide, independent of dehydroascorbate.
  • Antioxidant selenoenzymes, particularly GPX1, suppressed ascorbate's effects, powered by NADPH.
  • Dietary selenium deficiency significantly enhanced ascorbate's efficacy against glioblastoma in vivo.

Conclusions:

  • Selenoproteins are critical regulators of cancer redox homeostasis.
  • Cancer sensitivity to ascorbate and other free radical-inducing therapies is influenced by selenium status.
  • Dietary selenium manipulation offers a potential strategy to improve the efficacy of pro-oxidant cancer therapies.