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Related Concept Videos

Hypoxia01:23

Hypoxia

2.6K
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
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Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

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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.
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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Biological Effects of Radiation02:59

Biological Effects of Radiation

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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

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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...
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Induction and Testing of Hypoxia in Cell Culture
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Induction and Testing of Hypoxia in Cell Culture

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Hypoxia and Predicting Radiation Response.

Richard P Hill1, Robert G Bristow2, Anthony Fyles3

  • 1Ontario Cancer Institute and Campbell Family Institute for Cancer Research, Princess Margaret Cancer Centre, Toronto, Ontario, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Canada; Department of Radiation Oncology, University of Toronto, Toronto, Canada.

Seminars in Radiation Oncology
|September 19, 2015
PubMed
Summary
This summary is machine-generated.

Hypoxic (low-oxygen) regions in solid tumors drive cancer progression and treatment resistance. Identifying tumors where hypoxia is a key factor is crucial for effective precision cancer medicine strategies.

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Diffuse Optical Spectroscopy for the Quantitative Assessment of Acute Ionizing Radiation Induced Skin Toxicity Using a Mouse Model
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Area of Science:

  • Oncology
  • Cancer Biology
  • Radiation Oncology

Background:

  • Hypoxic regions are common in solid tumors and influence tumor biology.
  • Hypoxia affects gene expression, genomic instability, invasion, metastasis, and survival.
  • Hypoxia can protect tumor cells from radiation therapy.

Purpose of the Study:

  • To review the role of tumor hypoxia in cancer progression and treatment response.
  • To discuss the challenges and strategies for targeting hypoxia in precision cancer medicine.
  • To highlight the importance of considering dynamic changes in tumor hypoxia during treatment.

Main Methods:

  • Literature review of experimental studies and clinical trials on tumor hypoxia.
  • Analysis of the biological consequences of hypoxia in various cancer types.
  • Discussion of precision medicine approaches for hypoxia-targeted therapies.

Main Results:

  • Hypoxia contributes to aggressive tumor phenotypes and resistance to therapy.
  • Clinical trials show benefits of hypoxia-targeted treatments in some cancers.
  • Not all hypoxic tumors require or benefit from hypoxia-targeted treatments.

Conclusions:

  • Understanding tumor hypoxia is critical for developing effective cancer treatments.
  • Precision medicine strategies are needed to identify patients who will benefit from hypoxia-targeted therapies.
  • Dynamic monitoring of tumor hypoxia during treatment is essential for optimal patient outcomes.