Screening active components from Rubus amabilis for pancreatic β-cells protection. - GreenMedInfo Summary
Screening active components fromfor pancreaticβ-cells protection.
Pharm Biol. 2020 Dec ;58(1):674-685. PMID: 32659127
CONTEXT: species (Rosaceae) have been used in folk medicine to treat diabetes due to their hypoglycaemic activity.
OBJECTIVE: To screen the active components that act as hypoglycaemic agents inFocke and the underlying mechanisms.
MATERIALS AND METHODS: Aqueous stem extract ofwas incubated with MIN6β-cells, PBS was used as the blank control. Then the cells were washed, cell membrane-bound components were dissociated and identified by UPLC/MS. Total procyanidins (PCs) inwas enriched and the cytotoxicity and anti-proliferation onβ-cell were evaluated by MTT assay. PCs at 25, 50, and 75 μg/mL was applied for 24 h to determine its effects on palmitate (PA)-induced apoptosis and GSIS. Western blotting was employed to detect the protein expression of PI3K/Akt/FoxO1 signalling. The antioxidant indices were also measured.
RESULTS: β-Cell membrane-bound components were identified as three procyanidin B dimers and a C trimer. PCs showed no significant cytotoxicity up to a concentrations of 100 μg/mL. PCs treatment reversed the elevated apoptosis rate and impaired GSIS induced by PA. PCs markedly decreased the intracellularROS and MDA production and increased the SOD activity. Moreover, PCs promoted the phosphorylation of Akt and FoxO1, and regulated Pdx-1 and Bax expression in MIN6 cells.The active components that act as hypoglycaemic agents inare procyanidins, which protected MIN6 cells against PA-induced apoptosis by activating PI3K/Akt/FoxO1 signalling. These results indicate thatβ-cell extraction, combined with UPLC/MS, is a valid method for screening antidiabetic components from herbal medicines.