Total Saponins of Rubus Parvifolius L. Exhibited Anti-Leukemia Effect in vivo through STAT3 and eIF4E Signaling Pathways / 中国结合医学杂志

OBJECTIVE@#To investigate the anti-leukemia effect of total saponins of Rubus parvifolius L. (TSRP) on K562 cell xenografts in nude mice and the mechanisms of action.@*METHODS@#The K562 cell xenografts in nude mice were established, and then randomly divided into 5 groups, the control group, the cytosine arabinoside group(Ara-c) and 3 TSRP groups (20, 40 and 100 mg/kg). The tumor volume and mass of each group of nude mice were measured and the anti-tumor rates of TSRP were calculated subsequently. The apoptosis status of tumor cells was detected by hematoxylin-eosin (HE) and terminal dexynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL) staining analysis. Finally, the activities of apoptosis related signaling of signal transducer and activator of transcription 3 (STAT3), eukaryotic initiation factor 4E (eIF4E) and B-cell lymphoma-2 (bcl-2) were determined with immunohistochemistry tests.@*RESULTS@#Subcutaneous injection of K562 cells induced tumor formation in nude mice, and the TSRP treated group showed a signifificant inhibitory effect on tumor formation. The nude mice treated with TSRP showed a signifificant decrease in tumor growth rate and tumor weight in comparison to the control group (all P<0.05). The HE staining and TUNEL assay showed that TSRP induced cell death by apoptosis. The immunohistochemical assay showed down-regulation of the bcl-2 gene in the TSRP treated cells. The phosphorylation levels of eIF4E and STAT3 were decreased obviously after the treatment of TSRP.@*CONCLUSION@#TSRP had an excellent tumor-suppressing effect on K562 cells in the nude mice xenograft model, suggesting that TSPR can be developed as a promising anti-chronic myeloide leukemia drug.

Study on purification process of total saponins of Rubus parvifolius L.with macroreticular resin / 中成药

Objective: To study the technological parameters of the purification process of total saponins of Rubus parvifolius L. with macroreticular resin. Methods: The adsorptive characteristics and elutive parameters of the process were studied by taking the elutive and purified ratio of total saponins of Rubus parvifolius L. as marker. Results: 19.3mL of the extractive of total saponins of Rubus parvifolius L. was purified with a column of macroreticular resin (R1cm?H20cm,dried weight 2.68g) and was washed with 100mL of distilled water, then was eluted with 100mL of 50% ethanol. Conclusion: With macroreticular resin to adsorb and purify, the elutive ratio of total saponins of Rubus parvifolius L. was over 79.2% and the purity reached 55.3%. So this process of applying macroreticular resin to adsorb and purify total saponins of Rubus parvifolius L. is feasible.