Radiation Response
Radiation Response - Related Videos
06:53
Quantification of γH2AX Foci in Response to Ionising Radiation
0 Views •
Cited by 23 •
2010
Quantification of DNA double-strand streaks using γH2AX formation as a molecular marker has become an invaluable tool in radiation biology. Here we demonstrate the use of an immunofluorescence assay for quantification of γH2AX foci after exposure of cells to radiation.
08:17
Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
0 Views •
Cited by 9 •
2015
Stereotactic ablative body radiation therapy (SBRT) involves the precise delivery of high-dose radiation to cancer tumor targets. A novel SBRT platform offers a first-of-its-kind gimbaled radiation accelerator mounted within a pivoting O-ring gantry capable of dynamic image-guided tumor tracking. Here, we describe dynamic tumor tracking for lung targets.
02:59
Biological Effects of Radiation
0 Views •
2020
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...
01:17
Radiation: Applications
0 Views •
2023
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...
06:21
Diffuse Optical Spectroscopy for the Quantitative Assessment of Acute Ionizing Radiation Induced Skin Toxicity Using a Mouse Model
0 Views •
Cited by 13 •
2016
We present a diffuse optical spectroscopic (DOS) approach that provides quantitative optical biomarkers of skin response to radiation. We describe DOS instrumentation design, optical parameters extraction algorithms and the animal handling procedures required to yield representative data from a pre-clinical mouse model of radiation induced erythema.
FAQs
Ionizing radiation can transfer energy directly to cellular molecules, including DNA, or act indirectly by generating reactive oxygen species. These chemically reactive molecules can damage DNA and other cellular components, creating signals that activate protective responses. Distinguishing direct molecular injury from oxidative damage helps researchers interpret why different radiation exposures produce different biological effects.
The response depends on how much energy is delivered, whether the exposure is ionizing or nonionizing, and the condition of the affected cells. These variables influence the extent of molecular damage and how effectively cells respond. Consequently, cells may repair injury, pause division through checkpoints, enter senescence, or undergo apoptosis rather than producing one uniform outcome.
DNA repair pathways attempt to correct radiation-associated damage, while cell-cycle checkpoints temporarily regulate progression through division. Together, these responses give cells an opportunity to limit the transmission of damaged DNA. If damage persists or cannot be adequately managed, the response may shift toward senescence or apoptosis, outcomes that influence tissue injury and radiation sensitivity.
Radiation response research compares how tumor cells and healthy tissues react to molecular damage, repair signaling, and cell-fate decisions. Differences in these responses can help explain why treatment may control a tumor while also affecting surrounding tissue. This knowledge supports efforts to predict treatment sensitivity and improve the balance between therapeutic effects and tissue injury.
In cancer radiotherapy, understanding radiation response helps researchers predict how tumors and healthy tissues will react to exposure. The relevant outcomes include DNA damage, repair activity, cell-cycle control, senescence, and apoptosis. Applying this biological information can guide research aimed at improving tumor control while reducing unintended injury to normal tissue.
Radiation response studies provide a biological basis for evaluating potential harm from environmental or occupational exposure. Researchers examine how radiation type, dose, and cellular condition relate to DNA damage, tissue injury, and longer-term consequences. These findings also inform investigation of radioprotection, which focuses on reducing or limiting harmful biological effects after exposure.