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2016 ; 6
(ä): 28476
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Amber Light (590?nm) Induces the Breakdown of Lipid Droplets through
Autophagy-Related Lysosomal Degradation in Differentiated Adipocytes
#MMPMID27346059
Choi MS
; Kim HJ
; Ham M
; Choi DH
; Lee TR
; Shin DW
Sci Rep
2016[Jun]; 6
(ä): 28476
PMID27346059
show ga
Lipolysis in the adipocytes provides free fatty acids for other tissues in
response to the energy demand. With the rapid increase in obesity-related
diseases, finding novel stimuli or mechanisms that regulate lipid metabolism
becomes important. We examined the effects of visible light (410, 457, 505, 530,
590, and 660?nm) irradiation on lipolysis regulation in adipocytes differentiated
from human adipose-derived stem cells (ADSCs). Interestingly, 590?nm (amber)
light irradiation significantly reduced the concentration of lipid droplets
(LDs). We further investigated the lipolytic signaling pathways that are involved
in 590?nm light irradiation-induced breakdown of LDs. Immunoblot analysis
revealed that 590?nm light irradiation-induced phosphorylation of
hormone-sensitive lipase (HSL) was insufficient to promote reduction of LDs. We
observed that 590?nm light irradiation decreased the expression of perilipin 1.
We found that 590?nm light irradiation, but not 505?nm, induced conversion of LC3
I to LC3 II, a representative autophagic marker. We further demonstrated that the
lysosomal inhibitors leupeptin/NH4Cl inhibited 590?nm light irradiation-induced
reduction of LDs in differentiated adipocytes. Our data suggest that 590?nm light
irradiation-induced LD breakdown is partially mediated by autophagy-related
lysosomal degradation, and can be applied in clinical settings to reduce obesity.