AIM: To study the anti-HBV effect of liposome-encapsulated matrine (Lip-M) in vitro and in vivo. METHODS: 2.2.15 cell line was cultured in vitro observe the effect of Lip-M and matrine on the secretion of HBsAg and HB...AIM: To study the anti-HBV effect of liposome-encapsulated matrine (Lip-M) in vitro and in vivo. METHODS: 2.2.15 cell line was cultured in vitro observe the effect of Lip-M and matrine on the secretion of HBsAg and HBeAg. The toxicity of Lip-M and matrine to 2.2.15 cell line was also studied by MTT method. In in vivo study, drug treatment experiment was carried out on the 13th day after ducks were infected with duck hepatitis B virus (DHBV). The ducks were randomly divided into 4 groups with 5-6 ducks in each group. Lip-M and matrine were given to DHBV-infected ducks respectively by gastric perfusion. Four groups were observed: group of Lip-M (20 mg/kg), group of Lip-M (10 mg/kg), group of matrine (20 mg/kg) and group of blank model. The drug was given once daily for 20 d continuously, and normal saline was used as control. The blood was drawn from the posterior tibial vein of all ducks before treatment (T0), after the medication for 5 (T5), 10 (T10), 15 (T15), 20 (T20) d and withdrawl of the drug for 3 d (P3). The serum samples were separated and stored at -70 ℃, DHBV-DNA was detected by the dot-blot hybridization. RESULTS: After addition of Lip-M and matrine to 2.2.15 cell line for eleven d, the median toxic concentration (TC50) of Lip-M and matrine was 7.29 mg/mL and 1.33 mg/mL respectively. The median concentration (IC50) of Lip-M to inhibit HBsAg and HBeAg expression was 0.078 mg/mL and 3.35 mg/mL respectively. The treatment index (TI) value of Lip-M for HBsAg and HBeAg was 93.46 and 2.17 respectively, better than that of matrine. The DHBV-infected duck model treatment test showed that the duck serum DHBV-DNA levels were markedly reduced in the group of Lip-M (20 mg/kg) after treated by gastric perfusion for 10, 15 and 20 d (0.43±0.22 vs 0.95±0.18, t = 4.70, P= 0.001<0.01.0.40±0.12 vs 0.95±0.18, t = 6.34, P= 0.000<0.01. 0.22±0.10 vs 0.95±0.18, t = 8.30, P= 0.000<0.01), compared to the group of matrine (20 mg/kg) (0.43±0.22 vs 0.79±0.19, t = 3.17, P= 0.01<0.05. 0.40±0.12 vs 0.73±0.24, t = 3.21, P=展开更多
为探究北斗卫星导航系统全球组网成功后的实际定位性能,对卫星连续跟踪情况、GDOP和PDOP值以及4 h PPP坐标解的残差以及北斗2号(BDS2)星座和北斗2/3(BDS2/3)组合星座进行研究分析。该研究肯定了北斗的定位性能,并认为完整的全星座北斗...为探究北斗卫星导航系统全球组网成功后的实际定位性能,对卫星连续跟踪情况、GDOP和PDOP值以及4 h PPP坐标解的残差以及北斗2号(BDS2)星座和北斗2/3(BDS2/3)组合星座进行研究分析。该研究肯定了北斗的定位性能,并认为完整的全星座北斗卫星系统的定位性能将会优于GPS卫星系统。展开更多
基金Supported by the Natural Science Foundation of Guangdong Province, No.B990353
文摘AIM: To study the anti-HBV effect of liposome-encapsulated matrine (Lip-M) in vitro and in vivo. METHODS: 2.2.15 cell line was cultured in vitro observe the effect of Lip-M and matrine on the secretion of HBsAg and HBeAg. The toxicity of Lip-M and matrine to 2.2.15 cell line was also studied by MTT method. In in vivo study, drug treatment experiment was carried out on the 13th day after ducks were infected with duck hepatitis B virus (DHBV). The ducks were randomly divided into 4 groups with 5-6 ducks in each group. Lip-M and matrine were given to DHBV-infected ducks respectively by gastric perfusion. Four groups were observed: group of Lip-M (20 mg/kg), group of Lip-M (10 mg/kg), group of matrine (20 mg/kg) and group of blank model. The drug was given once daily for 20 d continuously, and normal saline was used as control. The blood was drawn from the posterior tibial vein of all ducks before treatment (T0), after the medication for 5 (T5), 10 (T10), 15 (T15), 20 (T20) d and withdrawl of the drug for 3 d (P3). The serum samples were separated and stored at -70 ℃, DHBV-DNA was detected by the dot-blot hybridization. RESULTS: After addition of Lip-M and matrine to 2.2.15 cell line for eleven d, the median toxic concentration (TC50) of Lip-M and matrine was 7.29 mg/mL and 1.33 mg/mL respectively. The median concentration (IC50) of Lip-M to inhibit HBsAg and HBeAg expression was 0.078 mg/mL and 3.35 mg/mL respectively. The treatment index (TI) value of Lip-M for HBsAg and HBeAg was 93.46 and 2.17 respectively, better than that of matrine. The DHBV-infected duck model treatment test showed that the duck serum DHBV-DNA levels were markedly reduced in the group of Lip-M (20 mg/kg) after treated by gastric perfusion for 10, 15 and 20 d (0.43±0.22 vs 0.95±0.18, t = 4.70, P= 0.001<0.01.0.40±0.12 vs 0.95±0.18, t = 6.34, P= 0.000<0.01. 0.22±0.10 vs 0.95±0.18, t = 8.30, P= 0.000<0.01), compared to the group of matrine (20 mg/kg) (0.43±0.22 vs 0.79±0.19, t = 3.17, P= 0.01<0.05. 0.40±0.12 vs 0.73±0.24, t = 3.21, P=
