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2016 ; 6
(ä): 28423
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Trehalose, sucrose and raffinose are novel activators of autophagy in human
keratinocytes through an mTOR-independent pathway
#MMPMID27328819
Chen X
; Li M
; Li L
; Xu S
; Huang D
; Ju M
; Huang J
; Chen K
; Gu H
Sci Rep
2016[Jun]; 6
(ä): 28423
PMID27328819
show ga
Trehalose is a natural disaccharide that is found in a diverse range of organisms
but not in mammals. Autophagy is a process which mediates the sequestration,
lysosomal delivery and degradation of proteins and organelles. Studies have shown
that trehalose exerts beneficial effects through inducing autophagy in mammalian
cells. However, whether trehalose or other saccharides can activate autophagy in
keratinocytes is unknown. Here, we found that trehalose treatment increased the
LC3-I to LC3-II conversion, acridine orange-stained vacuoles and GFP-LC3B (LC3B
protein tagged with green fluorescent protein) puncta in the HaCaT human
keratinocyte cell line, indicating autophagy induction. Trehalose-induced
autophagy was also observed in primary keratinocytes and the A431 epidermal
cancer cell line. mTOR signalling was not affected by trehalose treatment,
suggesting that trehalose induced autophagy through an mTOR-independent pathway.
mTOR-independent autophagy induction was also observed in HaCaT and HeLa cells
treated with sucrose or raffinose but not in glucose, maltose or sorbitol treated
HaCaT cells, indicating that autophagy induction was not a general property of
saccharides. Finally, although trehalose treatment had an inhibitory effect on
cell proliferation, it had a cytoprotective effect on cells exposed to UVB
radiation. Our study provides new insight into the saccharide-mediated regulation
of autophagy in keratinocytes.