Preparation and Drug Release in vitro of Danshensu Liposomes / 中国药师

Objective:o prepare Danshensu liposomes and investigate drug release characteristics in vitro. Methods: Danshensu liposomes were prepared by a reverse-phase evaporation method. The encapsulation efficiency was used as the index, an orthogonal test was adopted to investigate the effect of concentration of soybean lecithin, ratio of lipid-Danshensu and pH value of solution on the preparation procedure of Danshensu liposomes. The particle size of the liposomes was also investigated by a transmission electron micro-scope ( TEM) . The concentration of Danshensu was determined by HPLC, and the difference of release characteristics in Danshensu li-posomes and Danshensu solution was measured by a dialysis method. Results:The optimum preparation technology was as follows:the concentration of soybean lecithin was 40 mg·ml-1 ,the ratio of drug-lipid was 1: 10,and the pH value of solution was 6. 6. The mor-phology of the prepared liposomes showed spheric structure with uniform diameter, and the average particle size was ( 174 ± 36 ) nm and the encapsulation efficiency was 38. 9%. The linear range of Danshensu was 2. 0-20. 0 mg·L-1(r=0. 9984). The drug release of liposomes in vitro was slower than that of free Danshensu solution in 24 h. Conclusion:Danshensu liposomes with fine morphology have sustained release property.

ROS is not involved in induction of cell death by Ent-11 alpha-hydroxy-15-oxo-kaur-16-en-19-oic-acid in HepG2 cells / 中国中药杂志

<p><b>OBJECTIVE</b>To identify the role of reactive oxygen species (ROS) formation on cell death induced by Ent-11alpha-hydroxy-15-oxo-kaur-16-en-19-oic-acid (5F) in HepG2 cells.</p><p><b>METHOD</b>MTT assay was used to determine the effect of 5F on proliferation of HepG2 cells, and apoptotic morphological changes were assessed using Hoechst/PI assay. To evaluate intracellular ROS levels, a GENMED kit was used. HepG2 cells were treated with 5F for 24 h or with 1 mmol x L(-1) GSH for 1 h prior to treatment with 5F for 24 h, then cytoplasmic mono- and oligonucleosomes were assessed with Cell Death Detection ELISA kit.</p><p><b>RESULT</b>The cytotoxicity of 5F on HepG2 cells was elevated with increasing 5F concentrations, as evidenced by the cell viability assay, and the apoptotic changes such as chromatin condensation were confirmed by Hoechst/PI staining. The decrease in ROS generation was observed in HepG2 cells following treatment with 5F. Cytoplasmic mono- and oligonucleosomes induced by 5F were not changed by decreasing basal level of ROS-mediated signaling with GSH. Further more, induction of ROS production by cisplatinum (CDDP) was canceled by treatment with 5F and 5F revealed a additive effect to cell killing by CDDP.</p><p><b>CONCLUSION</b>5F can not only induce apoptosis through non-ROS-depandent pathway, and can abate oxidant stress.</p>

Effect of 5F from Pteris semipinnata on expression of Nr1d1 in HO-8910PM cell line / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the effects of PsL5F (ent-11alpha-hydroxy-15-oxo-kaur-16-en-19-oic-acid, an extract from Pteris semipinnata L) on the expression of nuclear receptor subfamily 1, group D, member 1 (Nr1d1) in highly metastatic ovarian carcinoma HO-8910PM cells, and its mechanisms.</p><p><b>METHOD</b>Microarray Chip was used to examine the level of Nr1d1 mRNA expression on HO-8910PM cells treated with PsL5F. Fluorescent quantitative real-time PCR assay and Western blot were performed to verify the effects of PsL5F on Nr1d1 mRNA and protein expression.</p><p><b>RESULT</b>After 24 h treatment of 100 micromol x L(-1) PsL5F, the mRNA and protein levels of Nr1d1 in HO-8910PM cells were 35.34 +/- 1.07 and 7.71 +/- 0.43 times compared to those of control group (P < 0.01, P < 0.01), respectively.</p><p><b>CONCLUSION</b>PsL5F can up-regulate significantly the expression of Nr1d1 in HO-8910PM cells. Antitumor effects and its mechanisms of PsL5F in HO-8910PM cells may be involved in the up-regulation of Nr1d1 expression.</p>