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Related Concept Videos

Cancer Therapies02:49

Cancer Therapies

Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
However, cancer treatments can pose several challenges, as therapies used to kill cancer cells are generally also toxic to normal cells. Moreover, cancer cells mutate rapidly and can develop resistance to chemical agents or radiation therapy. Besides, all types of cancer cells may not respond to the same therapy. Some cancer cells respond to one...
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

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.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...

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Related Experiment Video

Updated: Jul 5, 2026

Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance
07:07

Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance

Published on: February 14, 2025

Hypoxic tumor cell radiosensitization through nitric oxide.

Mark De Ridder1, Dirk Verellen, Valeri Verovski

  • 1UZ Brussel, Oncologisch Centrum, Dienst Radiotherapie, Laarbeeklaan 101, B-1090 Brussels, Belgium. mark.deridder@uzbrussel.be

Nitric Oxide : Biology and Chemistry
|May 14, 2008
PubMed
Summary
This summary is machine-generated.

Tumor hypoxia causes radioresistance. Endogenous nitric oxide (NO) production via inducible nitric oxide synthase (iNOS) radiosensitizes hypoxic tumor cells at non-toxic levels, offering a new therapeutic strategy.

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Induction and Testing of Hypoxia in Cell Culture
07:01

Induction and Testing of Hypoxia in Cell Culture

Published on: August 12, 2011

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Last Updated: Jul 5, 2026

Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance
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Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance

Published on: February 14, 2025

Induction and Testing of Hypoxia in Cell Culture
07:01

Induction and Testing of Hypoxia in Cell Culture

Published on: August 12, 2011

Area of Science:

  • Oncology
  • Radiation Oncology
  • Cancer Biology

Background:

  • Tumor hypoxia is a key factor in radioresistance and treatment failure.
  • Current oxygenation and chemical radiosensitizer strategies face limitations due to diffusion, consumption, and toxicity.
  • Nitric oxide (NO) is an effective radiosensitizer, but achieving therapeutic levels in vivo is challenging.

Purpose of the Study:

  • To investigate overcoming NO-related limitations by exploring endogenous NO production within tumors.
  • To determine if inducible nitric oxide synthase (iNOS) can radiosensitize hypoxic tumor cells via endogenous NO generation.
  • To elucidate the regulatory mechanisms controlling iNOS-mediated radiosensitization.

Main Methods:

  • Investigated iNOS activation by pro-inflammatory cytokines in hypoxic tumor cells.
  • Assessed radiosensitizing effects of endogenously produced NO at non-toxic concentrations.
  • Analyzed the transcriptional regulation of iNOS by hypoxia and NF-kappaB.
  • Explored the role of tumor-associated immune cells in radiosensitization.

Main Results:

  • Demonstrated that iNOS activation leads to endogenous NO production, radiosensitizing tumor cells.
  • Showed that this radiosensitization occurs at non-toxic extracellular NO concentrations.
  • Identified hypoxia and NF-kappaB as transcriptional regulators of this effect.
  • Observed potential contribution of immune cells to bystander tumor cell radiosensitization.

Conclusions:

  • Endogenous NO production by iNOS offers a promising approach to overcome hypoxia-induced radioresistance.
  • The findings support combining immunostimulatory and radiosensitizing strategies for enhanced cancer therapy.
  • This approach may improve treatment outcomes by targeting radioresistant hypoxic tumors.