Molecular Circadian Rhythm Shift Due to Bright Light Exposure Before Bedtime is Related to Subthreshold Bipolarity

Overview

Journal Sci Rep

Specialty Science

Date 2016 Aug 23

PMID 27545669

Citations 15

Authors

Chul-Hyun Cho

Joung-Ho Moon

Ho-Kyoung Yoon

Seung-Gul Kang

Dongho Geum

Gi-Hoon Son

Jong-Min Lim

Leen Kim

Eun-Il Lee

Heon-Jeong Lee

Affiliations

Soon will be listed here.

Abstract

This study examined the link between circadian rhythm changes due to bright light exposure and subthreshold bipolarity. Molecular circadian rhythms, polysomnography, and actigraphy data were studied in 25 young, healthy male subjects, divided into high and low mood disorder questionnaire (MDQ) score groups. During the first 2 days of the study, the subjects were exposed to daily-living light (150 lux) for 4 hours before bedtime. Saliva and buccal cells were collected 5 times a day for 2 consecutive days. During the subsequent 5 days, the subjects were exposed to bright light (1,000 lux), and saliva and buccal cell samples were collected in the same way. Molecular circadian rhythms were analyzed using sine regression. Circadian rhythms of cortisol (F = 16.956, p < 0.001) and relative PER1/ARNTL gene expression (F = 122.1, p < 0.001) showed a delayed acrophase in both groups after bright light exposure. The high MDQ score group showed a significant delay in acrophase compared to the low MDQ score group only in salivary cortisol (F = 8.528, p = 0.008). The high MDQ score group showed hypersensitivity in cortisol rhythm shift after bright light exposure, suggesting characteristic molecular circadian rhythm changes in the high MDQ score group may be related to biological processes downstream from core circadian clock gene expression.

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