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Updated: Jun 1, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
Published on: November 11, 2016
Molecular basis of chronopharmaceutics
Shigehiro Ohdo1, Satoru Koyanagi, Naoya Matsunaga
1Department of Pharmaceutics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan. ohdo@phar.kyushu-u.ac.jp
Biological rhythms influence health and disease. Understanding chronopharmacology, the study of how drug timing affects pharmacokinetics and pharmacodynamics, can optimize treatment effectiveness and safety.
Area of Science:
- Chronobiology
- Pharmacology
- Genetics
Background:
- Physiological processes, including metabolism and sleep-wake cycles, exhibit 24-hour biological rhythms.
- Disruptions in these circadian variations can trigger or worsen diseases.
- Chronotherapeutics, optimizing drug efficacy and safety through timed administration, is a growing field.
Purpose of the Study:
- To review the biological rhythm regulatory systems.
- To explore the application of chronobiology in pharmaceutics.
- To examine the impact of Clock gene variability on drug pharmacokinetics and pharmacodynamics.
Main Methods:
- Review of existing literature on circadian rhythms, chronopharmacology, and Clock genes.
- Analysis of the molecular mechanisms underlying circadian regulation.
- Discussion of intra- and inter-individual variations in Clock gene expression.
Main Results:
- The suprachiasmatic nucleus acts as the mammalian circadian pacemaker, regulated by Clock genes.
- CLOCK mutations affect gene expression, leading to phenotypic changes impacting drug parameters.
- Both pharmacodynamics and pharmacokinetics of drugs are influenced by circadian rhythms.
Conclusions:
- Chronopharmacological principles are crucial for personalized medicine.
- Understanding Clock gene variability can lead to tailored drug therapies.
- Optimizing drug delivery timing based on biological rhythms enhances therapeutic outcomes.
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