We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Dark nights reverse metabolic disruption caused by dim light at night.
- Authors
Fonken, L.K.; Weil, Z.M.; Nelson, R.J.
- Abstract
Objective The increasing prevalence of obesity and related metabolic disorders coincides with increasing exposure to light at night. Previous studies report that mice exposed to dim light at night (dLAN) develop symptoms of metabolic syndrome. This study investigated whether mice returned to dark nights after dLAN exposure recover metabolic function. Design and Methods Male Swiss-Webster mice were assigned to either: standard light-dark (LD) conditions for 8 weeks (LD/LD), dLAN for 8 weeks (dLAN/dLAN), LD for 4 weeks followed by 4 weeks of dLAN (LD/dLAN), and dLAN for 4 weeks followed by 4 weeks of LD (dLAN/LD). Results After 4 weeks in their respective lighting conditions both groups initially placed in dLAN increased body mass gain compared to LD mice. Half of the dLAN mice (dLAN/LD) were then transferred to LD and vice versa (LD/dLAN). Following the transfer dLAN/dLAN and LD/dLAN mice gained more weight than LD/LD and dLAN/LD mice. At the conclusion of the study dLAN/LD mice did not differ from LD/LD mice with respect to weight gain and had lower fat pad mass compared to dLAN/dLAN mice. Compared to all other groups dLAN/dLAN mice decreased glucose tolerance as indicated by an intraperitoneal glucose tolerance test at week 7, indicating that dLAN/LD mice recovered glucose metabolism. dLAN/dLAN mice also increased MAC1 mRNA expression in peripheral fat as compared to both LD/LD and dLAN/LD mice, suggesting peripheral inflammation is induced by dLAN, but not sustained after return to LD. Conclusion These results suggest that re-exposure to dark nights ameliorates metabolic disruption caused by dLAN exposure.
- Subjects
METABOLISM; NIGHT; OBESITY; METABOLIC disorders; METABOLIC syndrome; LABORATORY mice
- Publication
Obesity (19307381), 2013, Vol 21, Issue 6, p1159
- ISSN
1930-7381
- Publication type
Article
- DOI
10.1002/oby.20108