Summary
This review explains how a central pacemaker in the suprachiasmatic nucleus (SCN) coordinates daily rhythms in physiology and behavior across virtually all body cells through neuronal and humoral signals. Understanding this architecture has direct implications for lighting design, as light is the primary entrainment cue for the SCN, and disruption of circadian timing is linked to metabolic, cardiovascular, and neurological disease.
Key Findings
- The SCN contains approximately 100,000 neurons in humans, each housing a self-sustained, cell-autonomous molecular oscillator
- Virtually all ~35 trillion human body cells possess their own circadian clocks, structurally indistinguishable from SCN neuron clocks
- Physiological processes oscillating on a circadian basis include sleep-wake cycles, metabolism, heart rate, blood pressure, body temperature, renal activity, and hormone/cytokine secretion
- Circadian rhythms are endogenously driven rather than purely reactive to environmental cues, highlighting the importance of consistent light-dark cycle exposure
Categories
Sleep & Circadian Health: Reviews the endogenous circadian timing system including sleep-wake cycles, SCN pacemaker function, and entrainment mechanisms.
The Science of Light: Discusses light as the primary timing cue for the central pacemaker and the molecular oscillator architecture relevant to lighting standards and circadian entrainment.
Author(s)
T Bollinger, U Schibler
Publication Year
2014
Number of Citations
196
Related Publications
Sleep & Circadian Health
- Phototransduction by retinal ganglion cells that set the circadian clock
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- The two‐process model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
- Strange vision: ganglion cells as circadian photoreceptors
The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice