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Related Concept Videos

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
Management of Insomnia01:19

Management of Insomnia

The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...

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Related Experiment Video

Updated: Jun 20, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Imaging multidimensional therapeutically relevant circadian relationships.

Jamil Singletary1, Patricia A Wood, Jovelyn Du-Quiton

  • 1Medical Chronobiology Laboratory, WJB Dorn VA Medical Center, University of South Carolina, SC 29209, USA.

International Journal of Biomedical Imaging
|August 19, 2009
PubMed
Summary

Circadian rhythms influence cancer cell proliferation. Timing drug delivery based on these rhythms can optimize cancer therapy effectiveness and minimize side effects.

Related Experiment Videos

Last Updated: Jun 20, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Area of Science:

  • Chronobiology
  • Cancer Biology
  • Pharmacology

Background:

  • Circadian clocks regulate cellular proliferation in both normal and cancerous tissues.
  • The timing of antiproliferative drug administration impacts therapeutic outcomes and toxicity.
  • Understanding temporal relationships is crucial for optimizing cancer therapy.

Purpose of the Study:

  • To investigate the temporal dynamics of circadian clocks in relation to cellular proliferation and drug targeting.
  • To develop methods for visualizing the temporal unfolding of drug effects within circadian cycles.
  • To enhance the understanding of the therapeutic index for antiproliferative cancer therapies.

Main Methods:

  • Concurrent measurement of target levels and pathway components in normal and malignant tissues across the circadian cycle.
  • Creation of multidimensional multimedia depictions to visualize temporal relationships.
  • Development of systems and methods for generating these temporal visualizations.

Main Results:

  • Demonstrated the impact of circadian timing on drug efficacy and toxicity.
  • Provided novel multidimensional visualizations of temporal drug effects.
  • Established a framework for analyzing circadian influences on cancer therapy.

Conclusions:

  • Circadian clock timing is a critical factor in the efficacy and safety of antiproliferative cancer drugs.
  • Multidimensional temporal depictions offer a powerful tool for understanding complex biological rhythms.
  • Optimizing drug administration schedules based on circadian rhythms holds significant therapeutic potential.