Related Experiment Video
Updated: May 18, 2026
11:24
Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation
Published on: July 3, 2015
Radiation responses and resistance.
1Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO, USA.
International Review of Cell and Molecular Biology
|September 11, 2012
Summary
Ionizing radiation is a cancer treatment, but it triggers survival mechanisms like increased cell proliferation. Understanding and blocking these radiation-induced survival pathways could improve cancer therapy outcomes.
Area of Science:
- Oncology
- Radiation Biology
- Cancer Therapeutics
Background:
- Ionizing radiation is a widely used cancer therapy due to its cytotoxic effects.
- However, radiation exposure can activate cellular protective and survival mechanisms.
- These adaptive responses can lead to tumor regrowth and treatment resistance.
Purpose of the Study:
- To investigate the pro-survival mechanisms induced by ionizing radiation in cancer cells.
- To understand how these mechanisms contribute to tumor repopulation post-treatment.
- To identify potential strategies for overcoming radiation resistance.
Main Methods:
- Review of existing literature on radiation biology and cancer cell survival.
- Analysis of cellular responses to ionizing radiation, including proliferation, angiogenesis, and motility.
- Discussion of therapeutic implications for enhancing radiotherapy efficacy.
Main Results:
- Radiation exposure stimulates cancer cell proliferation and alters tumor vasculature.
- Changes in cell motility are observed, potentially aiding in tumor spread or repopulation.
- These adaptive mechanisms promote cell survival and contribute to treatment failure.
Conclusions:
- The pro-survival effects of radiation present a significant challenge in radiotherapy.
- Targeting radiation-induced proliferation, vascular remodeling, and altered cell motility is crucial.
- Developing strategies to inhibit these mechanisms could significantly improve radiotherapy outcomes.
Related Concept Videos
02:59Biological Effects of Radiation
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 produce ions...
01:19Resistance
When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
01:17Radiation: Applications
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
01:35Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
01:05Absorption of Radiation
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
01:09Radiation Pressure: Problem Solving
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...