The purpose of this study was to design and prepare a biocompatible microemulsion of Andrographis paniculata(BMAP) containing both fat-soluble and water-soluble constituents. We determined the contents of active const...The purpose of this study was to design and prepare a biocompatible microemulsion of Andrographis paniculata(BMAP) containing both fat-soluble and water-soluble constituents. We determined the contents of active constituents of BMAP and evaluated its bioavailability. The biocompatible microemulsion(BM), containing lecithin and bile salts, was optimized in the present study, showing a good physical stability. The mean droplet size was 19.12 nm, and the average polydispersity index(PDI) was 0.153. The contents of andrographolide and dehydroandrographolide in BMAP, as determined by high performance liquid chromatography(HPLC), were higher than that in ethanol extraction. The pharmacokinetic results of BMAP showed that the AUC0-7 and AUC0→∞ values of BMAP were 2.267 and 27.156 μg·m L-1·h 1, respectively, and were about 1.41-fold and 6.30-fold greater than that of ethanol extraction, respectively. These results demonstrated that the bioavailability of and rographolide extracted by BMAP was significantly higher than that extracted by ethanol. In conclusion, the BMAP preparation displayed ann improved dose form for future clinical applications.展开更多
Huperzine A(Hup-A) is a poorly water-soluble drug with low oral bioavailability. A selfmicroemulsifying drug delivery system(SMEDDS) was used to enhance the oral bioavailability and lymphatic uptake and transport of H...Huperzine A(Hup-A) is a poorly water-soluble drug with low oral bioavailability. A selfmicroemulsifying drug delivery system(SMEDDS) was used to enhance the oral bioavailability and lymphatic uptake and transport of Hup-A. A single-pass intestinal perfusion(SPIP) technique and a chylomicron flow-blocking approach were used to study its intestinal absorption, mesenteric lymph node distribution and intestinal lymphatic uptake. The value of the area under the plasma concentration–time curve(AUC) of Hup-A SMEDDS was significantly higher than that of a Hup-A suspension(P <0.01).The absorption rate constant(K_a) and the apparent permeability coefficient(P_(app)) for Hup-A in different parts of the intestine suggested a passive transport mechanism, and the values of K_a and P_(app) of Hup-A SMEDDS in the ileum were much higher than those in other intestinal segments. The determination of Hup-A concentration in mesenteric lymph nodes can be used to explain the intestinal lymphatic absorption of Hup-A SMEDDS. For Hup-A SMEDDS, the values of AUC and maximum plasma concentration(C_(max)) of the blocking model were significantly lower than those of the control model(P<0.05). The proportion of lymphatic transport of Hup-A SMEDDS and Hup-A suspension were about 40% and 5%,respectively, suggesting that SMEDDS can significantly improve the intestinal lymphatic uptake and transport of Hup-A.展开更多
The extremely low bioavailability of oral paclitaxel(PTX)mainly due to the complicated gastrointestinal environment,the obstruction of intestinal mucus layer and epithelium barrier.Thus,it is of great significance to ...The extremely low bioavailability of oral paclitaxel(PTX)mainly due to the complicated gastrointestinal environment,the obstruction of intestinal mucus layer and epithelium barrier.Thus,it is of great significance to construct a coordinative delivery system which can overcome multiple intestinal physicochemical obstacles simultaneously.In this work,a high-density PEGylation-based glycocholic acid-decorated micelles(PTX@GNPs)was constructed by a novel polymer,9-Fluorenylmethoxy carbonyl-poly ethylene glycocholic acid(Fmoc-PEG-GCA).The Fmoc motif in this polymer could encapsulate PTX viaπ-πstacking to form the core of micelles,and the low molecular weight and non-long hydrophobic chain of Fmoc ensures the high-density of PEG.Based on this versatile and flexible carriers,PTX@GNPs possess mucus trapping escape ability due to the flexible PEG,and excellent intestine epithelium targeting attributed to the high affinity of GCA with apical sodium-dependent bile acid transporter.The in vitro and in vivo results showed that this oral micelle could enhance oral bioavailability of PTX,and exhibited similar antitumor efficacy to Taxol injection via intravenous route.In addition,oral PTX@GNPs administered with lower dosage within shorter interval could increase in vivo retention time of PTX,which supposed to remodel immune microenvironment and enhance oral chemotherapy efficacy by synergistic effect.展开更多
制备紫杉醇-五味子乙素微乳(Paclitaxel-Schisandrin B microemulsions,PSM),评价其稳定性、急性毒性和抗肿瘤作用。利用激光粒度及Zeta电位分布测定仪和SephadexG50色谱柱,测定了PSM的粒径为(98.2±12.6)nm、Zeta电位为(-29.6±...制备紫杉醇-五味子乙素微乳(Paclitaxel-Schisandrin B microemulsions,PSM),评价其稳定性、急性毒性和抗肿瘤作用。利用激光粒度及Zeta电位分布测定仪和SephadexG50色谱柱,测定了PSM的粒径为(98.2±12.6)nm、Zeta电位为(-29.6±5.8)mv和对紫杉醇运载率可达98.2%±0.5%(n=3)。在冷藏(7℃)避光条件下保存1年,粒度、药物运载率几乎无改变。通过比较PSM与紫杉醇的毒性及使用S180肉瘤动物模型,发现与游离紫杉醇相比,PSM显著提高了紫杉醇的抗肿瘤作用,同时显著减轻了紫杉醇的急性毒性。由此可推测PSM有可能成为一种优于紫杉醇注射剂的抗肿瘤药物,抗肿瘤作用更强同时毒性显著减轻。展开更多
基金supported by the National Nature Science Foundation of China(No.81102815)New Teacher Fund for Doctor Station,the Ministry of Education of China(No.20110013120017)
文摘The purpose of this study was to design and prepare a biocompatible microemulsion of Andrographis paniculata(BMAP) containing both fat-soluble and water-soluble constituents. We determined the contents of active constituents of BMAP and evaluated its bioavailability. The biocompatible microemulsion(BM), containing lecithin and bile salts, was optimized in the present study, showing a good physical stability. The mean droplet size was 19.12 nm, and the average polydispersity index(PDI) was 0.153. The contents of andrographolide and dehydroandrographolide in BMAP, as determined by high performance liquid chromatography(HPLC), were higher than that in ethanol extraction. The pharmacokinetic results of BMAP showed that the AUC0-7 and AUC0→∞ values of BMAP were 2.267 and 27.156 μg·m L-1·h 1, respectively, and were about 1.41-fold and 6.30-fold greater than that of ethanol extraction, respectively. These results demonstrated that the bioavailability of and rographolide extracted by BMAP was significantly higher than that extracted by ethanol. In conclusion, the BMAP preparation displayed ann improved dose form for future clinical applications.
基金supported by the National Natural Science Foundation of China(Grant Nos.8127410081573615)+2 种基金Natural Science Foundation of Anhui Province of China(Grant No.1408085QH189)Key Project for the Excellent Higher Education of Anhui Province of China(Grant No.2013SQRL019ZD)Research Project for the Science and Technology of Bozhou city of China(Grant No.BK2015005)
文摘Huperzine A(Hup-A) is a poorly water-soluble drug with low oral bioavailability. A selfmicroemulsifying drug delivery system(SMEDDS) was used to enhance the oral bioavailability and lymphatic uptake and transport of Hup-A. A single-pass intestinal perfusion(SPIP) technique and a chylomicron flow-blocking approach were used to study its intestinal absorption, mesenteric lymph node distribution and intestinal lymphatic uptake. The value of the area under the plasma concentration–time curve(AUC) of Hup-A SMEDDS was significantly higher than that of a Hup-A suspension(P <0.01).The absorption rate constant(K_a) and the apparent permeability coefficient(P_(app)) for Hup-A in different parts of the intestine suggested a passive transport mechanism, and the values of K_a and P_(app) of Hup-A SMEDDS in the ileum were much higher than those in other intestinal segments. The determination of Hup-A concentration in mesenteric lymph nodes can be used to explain the intestinal lymphatic absorption of Hup-A SMEDDS. For Hup-A SMEDDS, the values of AUC and maximum plasma concentration(C_(max)) of the blocking model were significantly lower than those of the control model(P<0.05). The proportion of lymphatic transport of Hup-A SMEDDS and Hup-A suspension were about 40% and 5%,respectively, suggesting that SMEDDS can significantly improve the intestinal lymphatic uptake and transport of Hup-A.
基金supported by grants from National Natural Science Foundation of China(No.82073778,China)CAMS Innovation Fund for Medical Sciences(CIFMS)(2021-I2M-1-026,China)+1 种基金Beijing Key Laboratory of Non-Clinical Drug Metabolism and PK/PD study(Z141102004414062,China)National Natural Science Foundation of China(No.82104106)。
文摘The extremely low bioavailability of oral paclitaxel(PTX)mainly due to the complicated gastrointestinal environment,the obstruction of intestinal mucus layer and epithelium barrier.Thus,it is of great significance to construct a coordinative delivery system which can overcome multiple intestinal physicochemical obstacles simultaneously.In this work,a high-density PEGylation-based glycocholic acid-decorated micelles(PTX@GNPs)was constructed by a novel polymer,9-Fluorenylmethoxy carbonyl-poly ethylene glycocholic acid(Fmoc-PEG-GCA).The Fmoc motif in this polymer could encapsulate PTX viaπ-πstacking to form the core of micelles,and the low molecular weight and non-long hydrophobic chain of Fmoc ensures the high-density of PEG.Based on this versatile and flexible carriers,PTX@GNPs possess mucus trapping escape ability due to the flexible PEG,and excellent intestine epithelium targeting attributed to the high affinity of GCA with apical sodium-dependent bile acid transporter.The in vitro and in vivo results showed that this oral micelle could enhance oral bioavailability of PTX,and exhibited similar antitumor efficacy to Taxol injection via intravenous route.In addition,oral PTX@GNPs administered with lower dosage within shorter interval could increase in vivo retention time of PTX,which supposed to remodel immune microenvironment and enhance oral chemotherapy efficacy by synergistic effect.
文摘制备紫杉醇-五味子乙素微乳(Paclitaxel-Schisandrin B microemulsions,PSM),评价其稳定性、急性毒性和抗肿瘤作用。利用激光粒度及Zeta电位分布测定仪和SephadexG50色谱柱,测定了PSM的粒径为(98.2±12.6)nm、Zeta电位为(-29.6±5.8)mv和对紫杉醇运载率可达98.2%±0.5%(n=3)。在冷藏(7℃)避光条件下保存1年,粒度、药物运载率几乎无改变。通过比较PSM与紫杉醇的毒性及使用S180肉瘤动物模型,发现与游离紫杉醇相比,PSM显著提高了紫杉醇的抗肿瘤作用,同时显著减轻了紫杉醇的急性毒性。由此可推测PSM有可能成为一种优于紫杉醇注射剂的抗肿瘤药物,抗肿瘤作用更强同时毒性显著减轻。