Preparation of podophyllotoxin nanostructured lipid carriers and its effects on immortalized human cervical epithelial cells with HPV infection in vitro / 南方医科大学学报

<p><b>OBJECTIVE</b>To study the effect of podophyllotoxin nanostructured lipid carriers (POD-NLC) on immortalized human cervical epithelial cells (H8) infected with HPV in vitro.</p><p><b>METHODS</b>POD-NLC was prepared by emulsion evaporation method and characterized using transmission electron microscopy, Zetasizer analyzer and high-performance liquid chromatography (HPLC). H8 cells were treated with different concentrations (0.0001-1 µg/ml) of POD-NLC, free POD, or blank nanostructured lipid carriers (NLC), and the cell proliferation was assessed using MTT assay to evaluate the cytotoxic effects. The changes of cell morphology were observed using fluorescence microscopy, and the cell cycle changes and cell apoptosis were analyzed using flow cytometry.</p><p><b>RESULTS</b>POD-NLC showed a spherical or elliptical shape with good stability in vitro. The average particle size of POD-NLC was 85.6∓10.25 nm, with a Zeta potential of 26.2∓4.1 mV and entrapment efficiency of POD of (88.56∓3.1)%. POD-NLC caused a significant inhibition of H8 cell proliferation in a concentration- and time-dependent manner. At an equivalent concentration, POD-NLC produced a stronger inhibitory effect on cell proliferation than POD. The inhibition rate of H8 cells after a 48-h exposure to POD-NLC and POD reached 95.8% and 65.6%, respectively, and at the highest concentration of 1 µg/ml, the IC(50) of POD-NLC and POD was 0.015 µg/ml and 0.13 µg/ml, respectively. Blank NLC did not obviously affect the proliferation of H8 cells. POD-NLC and POD both caused obvious increases in G(2)/M phase cell percentages and induced typical apoptotic changes of the cells, and their effects were comparable (P>0.05).</p><p><b>CONCLUSION</b>Compared with POD, POD-NLC has more potent effect in inhibiting H8 cell proliferation and inducing cell apoptosis, suggesting its potential in the treatment of cervical HPV infection.</p>

Effect of wet dressing with Jingjielianqiao decoction on healing of acute radiation-induced skin ulcers in rats / 南方医科大学学报

<p><b>OBJECTIVE</b>To observe the pharmacodynamics of Jingjielianqiao decoction in promoting the healing of acute radiation-induced skin ulcers in mice.</p><p><b>METHODS</b>Skin ulcers were induced in mice by radiation, and Jingjielianqiao decoction, rivanol or normal saline was applied for the treatment. The swelling of the legs was measured in mice using volumetric method, and the ulcer area after treatment was compared among the 3 groups.</p><p><b>RESULTS</b>No significant difference was found in the anti-inflammatory effects between Jingjielianqiao decoction group and rivanol group (P>0.05), but a significant difference was noted between Jingjielianqiao decoction group and normal saline group and also between rivanol group and normal saline group (P<0.01). Significant differences were observed in the ulcer healing among the 3 groups (P<0.01).</p><p><b>CONCLUSION</b>Jingjielianqiao decoction can significantly suppress radiation-induced acute inflammation and shows better effect than rivanol in promoting the healing of acute radiation-induced skin ulcer in rats.</p>