Panax notoginseng saponins can inhibit the proliferation and induce apoptosis in K562 cells. - GreenMedInfo Summary
[Effects of Panax notoginseng saponins on proliferation, apoptosis and cell cycle of K562 cells in vitro and the mechanisms].
Nan Fang Yi Ke Da Xue Xue Bao. 2015 Aug ;35(8):1103-9. PMID: 26277504
Yuyun Li
OBJECTIVE: To investigate the effects of Panax notoginseng saponins (PNS) on the proliferation, apoptosis and cell cycle of K562 cells and explore the molecular mechanisms underlying these effects.
METHODS: PNS-induced growth inhibition of K562 cells was detected by MTT assay; the cell apoptosis was evaluated by AO/EB staining and Annexin V-FITC/ PI staining; flow cytometry was used to detect cell cycle changes in the treated cells. The mRNA expressions of the molecules in mTOR signaling pathway were examined by RT-PCR, and the cellular expressions of cleaved caspeas-3, cyclin D1 and major proteins in mTOR signaling pathway were detected using Western blotting.
RESULTS: MTT assay showed that treatment with 100-800µg/mL PNS significantly inhibited the proliferation, promoted the cell apoptosis, and caused cell cycle arrest in G0/G1 phase in K562 cells. Western blotting revealed increased protein expression of cleaved caspase-3 and decreased expression of cyclin D1 in PNS-treated cells, in which the proteinsexpressions of mTOR, p-mTOR, p-p70S6K and p-4E-BP 1 and the mRNA expression of mTOR were all decreased.
CONCLUSION: PNS can inhibit the proliferation, induce apoptosis and cause cell cycle arrest in K562 cells possibly by up-regulating cleaved caspase 3 and down-regulating cyclin D1 and mTOR signaling pathway.
