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2017 ; 8
(ä): 749
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Salidroside, A Natural Antioxidant, Improves ?-Cell Survival and Function via
Activating AMPK Pathway
#MMPMID29093682
Ju L
; Wen X
; Wang C
; Wei Y
; Peng Y
; Ding Y
; Feng L
; Shu L
Front Pharmacol
2017[]; 8
(ä): 749
PMID29093682
show ga
Aim: The enhanced oxidative stress contributes to progression of type 2 diabetes
mellitus (T2DM) and induces ?-cell failure. Salidroside is a natural antioxidant
extracted from medicinal food plant Rhodiola rosea. This study was aimed to
evaluate protective effects of salidroside on ?-cells against diabetes associated
oxidative stress. Methods and Results: In diabetic db/db and high-fat
diet-induced mice, we found salidroside ameliorated hyperglycemia and relieved
oxidative stress. More importantly, salidroside increased ?-cell mass and ?-cell
replication of diabetic mice. Mechanism study in Min6 cells revealed that, under
diabetic stimuli, salidroside suppressed reactive oxygen species production and
restore mitochondrial membrane potential (??m) via reducing NOX2 expression and
inhibiting JNK-caspase 3 apoptotic cascade subsequently to protect ?-cell
survival. Simultaneously, diabetes associated oxidative stress also activated
FOXO1 and triggered nuclear exclusion of PDX1 which resulted in ?-cell
dysfunction. This deleterious result was reversed by salidroside by activating
AMPK-AKT to inhibit FOXO1 and recover PDX1 nuclear localization. The efficacy of
salidroside in improving ?-cell survival and function was further confirmed in
isolated cultured mouse islets. Moreover, the protective effects of salidroside
on ?-cells against diabetic stimuli can be abolished by an AMPK inhibitor
compound C, which indicated functions of salidroside on ?-cells were AMPK
activation dependent. Conclusion: These results confirmed beneficial metabolic
effects of salidroside and identified a novel role for salidroside in preventing
?-cell failure via AMPK activation. Our finding highlights the potential value of
Rhodiola rosea as a dietary supplement for diabetes control.