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Related Experiment Video

Updated: Jun 28, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Published on: November 11, 2016

Glucocorticoids and the circadian clock.

Thomas Dickmeis¹

¹Institute of Toxicology and Genetics, Forschungszentrum Karlsruhe, Eggenstein-Leopoldshafen, Germany. thomas.dickmeis@itg.fzk.de

The Journal of Endocrinology

|October 31, 2008

Summary

Glucocorticoids, essential hormones for homeostasis, exhibit a daily rhythm controlled by the circadian clock. This biological timing system regulates hormone release, impacting daily physiological functions.

Area of Science:

Endocrinology
Chronobiology
Neuroscience

Background:

Glucocorticoids are vital adrenal cortex hormones regulating homeostasis and stress response.
Their release follows a diurnal pattern, peaking at the start of the activity phase.
This rhythm is orchestrated by the endogenous circadian clock, preparing the body for daily environmental shifts.

Purpose of the Study:

To elucidate the mechanisms of circadian control over glucocorticoid production and secretion.
To investigate the roles of the central circadian pacemaker and the adrenal gland clock in this regulation.
To explore the feedback mechanisms between glucocorticoids and peripheral circadian clocks.

Main Methods:

The study focuses on the hypothalamic-pituitary-adrenal (HPA) axis and autonomic nervous system pathways.

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Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Published on: September 17, 2016

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Last Updated: Jun 28, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Published on: November 11, 2016

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Published on: September 17, 2016

It examines the function of the suprachiasmatic nucleus (SCN) as the central circadian pacemaker.

It investigates the intrinsic circadian clock within the adrenal gland and its regulation by adrenocorticotropic hormone (ACTH).

Main Results:

Circadian control of glucocorticoid release involves both central (SCN) and peripheral (adrenal) clocks.
The HPA axis and autonomic nervous system mediate central circadian regulation.
The adrenal gland clock modulates sensitivity to ACTH, influencing hormone secretion.

Conclusions:

The circadian clock precisely regulates glucocorticoid release, essential for daily physiological timing.
Rhythmically released glucocorticoids may synchronize peripheral clocks, fine-tuning tissue-specific functions.
This intricate interplay ensures optimal adaptation to daily environmental cycles.