Summary
This paper investigates how light exposure during darkness disrupts circadian photoreception through intrinsically photosensitive retinal ganglion cells (ipRGCs), which are most sensitive to ~480 nm (blue) light, potentially suppressing melatonin and promoting tumor growth. For healthcare and lighting designers, this underscores the importance of minimizing blue-wavelength light exposure during nighttime hours, particularly in hospital and home environments for cancer patients.
Key Findings
- ipRGCs in rats and monkeys show peak spectral sensitivity around 480 nm, even when synaptic input from rods and cones is blocked, confirming their autonomous photosensitivity.
- Nocturnal light exposure, particularly at short (blue) wavelengths, is implicated in circadian disruption and may promote tumor biology through melatonin suppression pathways.
Categories
Sleep & Circadian Health: Paper examines how light exposure during darkness disrupts circadian photoreception via ipRGCs, with direct implications for melatonin suppression and cancer risk.
The Science of Light: Focuses on ipRGC spectral sensitivity (~480 nm peak) and photoreceptor biology underlying circadian disruption by nocturnal light exposure.
Patient Recovery: Explores relationships between light-at-night-induced circadian disruption and tumor biology, with implications for cancer treatment and patient outcomes.
Author(s)
SA Jasser, DE Blask, GC Brainard
Publication Year
2006
Number of Citations
105
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 twoāprocess 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
Patient Recovery
- An overview of the effects of light on human circadian rhythms: Implications for new light sources and lighting systems design
- Application of different circadian lighting metrics in a health residence
- Melatonin and cortisol in individuals with spinal cord injury
- Sustainable lighting for healthcare facilities: More than just lumens per watt
- Green light analgesia in mice is mediated by visual activation of enkephalinergic neurons in the ventrolateral geniculate nucleus