AIM: To observe the effect of receptor-interacting protein 2 (Rip2) overexpression on human pan-creatic cancer cell line Panc-1.METHODS: pEGFP-C2 and pEGFP-Rip2 plasmids were respectively transfected into the Panc-1 cells using JetPRIME reagent.The cells were divided into control group, pEGFP-C2 group and pEGFP-Rip2 group. The apoptosis in the cells was detected 48 h after transfection by flow cytometry.Rip2 level and the expression of apoptosis-related proteins, Bax, cytoplasmic cytochrome c ( Cyt-c) and Bcl-2, were analyzed by Western blot.The activity of caspase-3 was measured by colorimetric method.RESULTS: Rip2 protein expression significantly increased in the cells transfected with control and pEGFP-C2 plasmids.The apoptotic rate in pEGFP-Rip2 group was higher than that in control group and pEGFP-C2 group, whereas no significant difference of apoptotic rate was observed between control group and pEGFP-C2 group.The protein expression of Bax and cytoplasmic Cyt-c was remarkably increased and the protein expression of Bcl-2 was obviously decreased in pEGFP-Rip2 group as compared with control group and pEGFP-C2 group.The activity of caspase-3 in pEGFP-Rip2 group was obviously increased as compared with control group and pEGFP-C2 group.CON-CLUSION: Overexpression of Rip2 is able to induce apoptosis in the Panc-1 cells, and the mechanism may be related to the up-regulation of Bax and cytoplasmic Cyt-c protein expression, down-regulation of Bcl-2 protein expression and en-hancement of caspase-3 activity, thus activating intrinsic apoptotic pathway.

In this study, an analytical method was developed and used to quantify simultaneously protocatechuic acid, neochlorogenic acid, cryptochlorogenic acid and 1, 3-dicaffeoylquinic acid--four bioactive compounds contained in Fructus Xanthii using UPLC. The contents of four phenolic components of 28 batches of samples collected from different product areas and markets were determined and compared by means of this established method. The mobile phase was composed of methanol and water containing 0.1% phosphoric acid. Chromatography was monitored at dual-wavelengths--220 and 327 nm. Flow rate was 0.4 mL x min(-1) and column temperature was 35 degrees C. The correlation coefficient between concentration and chromatographic peak area of protocatechuic acid, neochlorogenic acid, cryptochlorogenic acid and 1, 3-dicaffeoylquinic acid was over 0.9999 in the range of 0.3570-35.70, 2.500-250.0, 1.060-106.1, 1.010-101.0 microg x mL(-1), respectively. The average recoveries of the four compounds were 97.68%, 99.55%, 97.92% and 100.4%, respectively. In conclusion, the established method can rapidly attain an accurate and reproducible result used to control the quality of Fructus Xanthii.