Removing Short Wavelengths From Polychromatic White Light Attenuates Circadian Phase Resetting in Rats

Overview

Journal Front Neurosci

Date 2019 Sep 26

PMID 31551702

Citations 5

Authors

Bojana Gladanac

James Jonkman

Colin M Shapiro

Theodore J Brown

Martin R Ralph

Robert F Casper

Shadab A Rahman

Affiliations

Soon will be listed here.

Abstract

Visible light is the principal stimulus for resetting the mammalian central circadian pacemaker. Circadian phase resetting is most sensitive to short-wavelength (blue) visible light. We examined the effects of removing short-wavelengths < 500 nm from polychromatic white light using optical filters on circadian phase resetting in rats. Under high irradiance conditions, both long- (7 h) and short- (1 h) duration short-wavelength filtered (< 500 nm) light exposure attenuated phase-delay shifts in locomotor activity rhythms by (∼40-50%) as compared to unfiltered light exposure. However, there was no attenuation in phase resetting under low irradiance conditions. Additionally, the reduction in phase-delay shifts corresponded to regionally specific attenuation in molecular markers of pacemaker activation in response to light exposure, including c-FOS, Per1 and Per2. These results demonstrate that removing short-wavelengths from polychromatic white light can attenuate circadian phase resetting in an irradiance dependent manner. These results have important implications for designing and optimizing lighting interventions to enhance circadian adaptation.

Citing Articles

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