目的优化四氢姜黄素脂质制剂处方。方法考察四氢姜黄素在不同类型脂质处方中的溶解度和溶出度,以确定适宜的处方类型,采用D-最优混料设计考察不同处方在简化体外消化试验中四氢姜黄素时间-浓度曲线的曲线下面积(AUC),探索不同载药量对...目的优化四氢姜黄素脂质制剂处方。方法考察四氢姜黄素在不同类型脂质处方中的溶解度和溶出度,以确定适宜的处方类型,采用D-最优混料设计考察不同处方在简化体外消化试验中四氢姜黄素时间-浓度曲线的曲线下面积(AUC),探索不同载药量对脂解条件下制剂体外性能的影响。结果最佳条件为蓖麻油7.6%,吐温8080%,Transcutol HP 12.4%,载药处方具有体外消化试验中最大的释放曲线AUC。最佳载药量为60%饱和载药量,即213 mg/g。结论该方法稳定可靠,预测性好,可用于四氢姜黄素脂质制剂处方。展开更多
目的:通过网状Meta分析,评价四种两性霉素B静脉剂型在治疗真菌感染方面的疗效和安全性。方法:检索中英文电子数据库(PubMed、Scopus、Web of Science、the Cochrane Library、Embase、中国知网、万方数据库、维普数据库和中国生物医学...目的:通过网状Meta分析,评价四种两性霉素B静脉剂型在治疗真菌感染方面的疗效和安全性。方法:检索中英文电子数据库(PubMed、Scopus、Web of Science、the Cochrane Library、Embase、中国知网、万方数据库、维普数据库和中国生物医学文献数据库),纳入比较两性霉素B与三唑类或棘白菌素类药物治疗真菌感染的随机对照试验(RCT)进行网状Meta分析。检索时间为建库至2023年8月5日,文献质量采用GRADE分级。结果:共纳入16篇文献,涉及4365例患者。在疗效方面,两性霉素B脂质体>两性霉素B脱氧胆酸盐>两性霉素B胶体分散体,差异有统计学意义(P<0.05),两性霉素B脂质体复合物与其他剂型相比差异暂无统计学意义(P>0.05);在总不良反应发生率方面,四种两性霉素B静脉剂型的差异无统计学意义(P>0.05)。亚组分析结果显示,两性霉素B脱氧胆酸盐相比两性霉素B胶体分散体具有更高的神经系统毒性,差异有统计学意义(P<0.05)。结论:四种两性霉素B静脉剂型中,脂质体剂型的疗效优于脱氧胆酸盐传统剂型;胶体分散体剂型的疗效显著低于传统剂型,同时神经系统毒性也较低。由于研究纳入文献数量有限,可能存在发表偏倚,故仍需更多大样本量、高质量的临床研究进一步证实本研究的结果和结论。展开更多
AIM:To study the anti-hepatocarcinoma effects of 5-fluorouracil (5-Fu) encapsulated by galactosylceramide liposomes (5-Fu-GCL) in vivo and in vitro. METHODS: Tumor-bearing animal model and HepA cell line were respecti...AIM:To study the anti-hepatocarcinoma effects of 5-fluorouracil (5-Fu) encapsulated by galactosylceramide liposomes (5-Fu-GCL) in vivo and in vitro. METHODS: Tumor-bearing animal model and HepA cell line were respectively adopted to evaluate the anti-tumor effects of 5-Fu-GCL in vivo and in vitro. Tumor cell growth inhibition effects of 5-Fu-GCL in vitro were assessed by cell viability assay and MTT assay. In vivo experiment, the inhibitory effects on tumor growth were evaluated by tumor inhibition rate and animal survival days. High performance liquid chromatography was used to detect the concentration-time course of 5-Fu-GCL in intracellular fluid in vitro and the distribution of 5-Fu-GCL in liver tumor tissues in vivo. Apoptosis and cell cycle of tumor cells were demonstrated by flow cytometry. RESULTS: In vitro experiment, 5-Fu-GCL (6.25-100 μmol/L) and free 5-Fu significantly inhibited HepA cell growth. Furthermore, IC50 of 5-Fu-GCL (34.5 μmol/L) was lower than that of free 5-Fu (51.2 μmol/L). In vivo experiment, 5-Fu-GCL (20, 40, 80 mg/kg) significantly suppressed the tumor growth in HepA bearing mice model. Compared with free 5-Fu, the area under curve of 5-Fu-GCL in intracellular fluid increased 2.6 times. Similarly, the distribution of 5-Fu-GCL in liver tumor tissues was significantly higher than that of free 5-Fu. After being treated with 5-Fu-GCL, the apoptotic rate and the proportion of HepA cells in the S phase increased, while the proportion in the G0/G1 and G2/M phases decreased. CONCLUSION: 5-Fu-GCL appears to have anti-hepatocarcinoma effects and its drug action is better than free 5-Fu. Its mechanism is partly related to increased drug concentrations in intracellular fluid and liver tumor tissues, enhanced tumor cell apoptotic rate and arrest of cell cycle in S phase.展开更多
Antioxidants are used to minimize lipid oxidation. Antioxidants can act as metal chelators and free radical or oxygen scavengers, which can slow the progression of lipid oxidation. Lipid oxidation may have negative ef...Antioxidants are used to minimize lipid oxidation. Antioxidants can act as metal chelators and free radical or oxygen scavengers, which can slow the progression of lipid oxidation. Lipid oxidation may have negative effects on the quality of meat and meat products, causing changes in sensory attributes such as color, texture, odor and flavor, and nutritional quality. Several synthetic antioxidants have been used to successfully prevent lipid oxidation in the meat industry, but consumers are concerned about the health risks related to consumption of some synthetic antioxidants. Therefore, there has been a growing interest in natural antioxidants. Nowadays, compounds obtained from natural sources such as grains, oilseeds, spices, fruit and vegetables have been investigated to decrease the lipid oxidation. In this review, the potential effects of natural antioxidants were evaluated that are widely used in meat and meat products.展开更多
Objective To investigate the role of acyl-coenzyme A:cholesterol acyltransferase inhibitor(ACATI) in apoptosis induced by lipids and whether lipids-induced apoptosis is accompanied by increase of free cholesterol in e...Objective To investigate the role of acyl-coenzyme A:cholesterol acyltransferase inhibitor(ACATI) in apoptosis induced by lipids and whether lipids-induced apoptosis is accompanied by increase of free cholesterol in endoplasmic reticulum(ER),in order to further understand the mechanism of lipids-induced apoptosis in advanced atherosclerosis.Methods Human vascular smooth muscle cells(VSMCs) and phorbol 12-myristate 13-acetate(PMA) differentiated THP-1 macrophages were used.Tritiated thymidine incorporation was applied to detect cell proliferation.Cytotoxicity was assessed by lactate dehydrogenase(LDH) release.4',6-diamidino-2-phenylindole(DAPI) staining,caspase-3,-7 assay,and Annexin-V/propidium iodide(PI) staining were used to detect apoptosis.High performance liquid chromatography was used in intracellular free cholesterol and cholesterol ester assay.ER free cholesterol was quantified.Results Different lipids had different effects on proliferation and cytotoxicity of VSMCs.25-hydroxycholesterol(25OHC) had biphasic effects on the proliferation of VSMCs.At low concentration,it stimulated cell proliferation,but turned to proliferation inhibition as concentration reached 15 μg/mL.25OHC and acetylated low density lipoprotein(AcLDL) could respectively induce apoptosis in human VSMCs and PMA differentiated THP-1 macrophages,which was aggravated by ACATI,accompanied by increase of intracellular free cholesterol content.There was also an increase of cholesterol content in ER with AcLDL-induced apoptosis in THP-1 macrophages.Conclusions Lipids could induce apoptosis,accompanied by increase of intracellular free cholesterol content,which could be augmented by ACATI,suggesting that insults resulting in ER free cholesterol rise might be the initiator of apoptosis.展开更多
Objective： The purpose of the study is to investigate the effects of up-regulation of Raf kinase inhibitor protein （RKIP） on the chemosensitivity of cervical cancer Hela cells. Methods： Eukaryotic expression plasm...Objective： The purpose of the study is to investigate the effects of up-regulation of Raf kinase inhibitor protein （RKIP） on the chemosensitivity of cervical cancer Hela cells. Methods： Eukaryotic expression plasmid pcDNA3.1（±）-ssRKIP containing human overall length RKIPcDNA was transfected into cervical cancer Hela cell by lipofectin assay, establishing a stable cell line containing a target gene by G418. Expression of RKIP in Hela cells was measured by Western blot analysis. After treatment with cisplatin of different concentrations and intervals of time, the effect of RKIP on the proliferation of Hela cells was evaluated by MTT method. The flow cytometry was used to investigate whether the RKIP could inhibit apoptosis in Hela cells induced by cisplatin. Results： The expression of RKIP in Hela cells transfected with pcDNA3.1-ssRKIP was increased obviously. After different concentrations of cisplatin treatment cells for 24, 48 and 72 h, the growth inhibition rate in Hela cells transfected with pcDNA3.1-ssRKIP was significantly higher than in control cells （P 〈 0.05）. With 5 pg/mL cisplatin treatment for 24 h, pcDNA3.1-ssRKIP-transfected Hela cells had an obviously higher percentage of apoptosis （23.2 ± 0.24）% than non-transfected cells （12.4 ± 0.31）% and empty vector-transfected cells （13.4 ± 0.47）%. Without treatment of cisplatin, the percentage of apoptosis for Hela cells transfected with pcDNA3.1-ssRKIP was （5.7 ± 0.12）%, which was still higher than those of the non-transfected cells （2.9 ± 0.21）% and empty vector-transfected cells （3 ± 0.08）%. Conclusion： Higher expres- sion of RKIP gene can improve chemosensitivitv of cervical cancer Hela cells to cisplatin.展开更多
文摘目的优化四氢姜黄素脂质制剂处方。方法考察四氢姜黄素在不同类型脂质处方中的溶解度和溶出度,以确定适宜的处方类型,采用D-最优混料设计考察不同处方在简化体外消化试验中四氢姜黄素时间-浓度曲线的曲线下面积(AUC),探索不同载药量对脂解条件下制剂体外性能的影响。结果最佳条件为蓖麻油7.6%,吐温8080%,Transcutol HP 12.4%,载药处方具有体外消化试验中最大的释放曲线AUC。最佳载药量为60%饱和载药量,即213 mg/g。结论该方法稳定可靠,预测性好,可用于四氢姜黄素脂质制剂处方。
文摘目的:通过网状Meta分析,评价四种两性霉素B静脉剂型在治疗真菌感染方面的疗效和安全性。方法:检索中英文电子数据库(PubMed、Scopus、Web of Science、the Cochrane Library、Embase、中国知网、万方数据库、维普数据库和中国生物医学文献数据库),纳入比较两性霉素B与三唑类或棘白菌素类药物治疗真菌感染的随机对照试验(RCT)进行网状Meta分析。检索时间为建库至2023年8月5日,文献质量采用GRADE分级。结果:共纳入16篇文献,涉及4365例患者。在疗效方面,两性霉素B脂质体>两性霉素B脱氧胆酸盐>两性霉素B胶体分散体,差异有统计学意义(P<0.05),两性霉素B脂质体复合物与其他剂型相比差异暂无统计学意义(P>0.05);在总不良反应发生率方面,四种两性霉素B静脉剂型的差异无统计学意义(P>0.05)。亚组分析结果显示,两性霉素B脱氧胆酸盐相比两性霉素B胶体分散体具有更高的神经系统毒性,差异有统计学意义(P<0.05)。结论:四种两性霉素B静脉剂型中,脂质体剂型的疗效优于脱氧胆酸盐传统剂型;胶体分散体剂型的疗效显著低于传统剂型,同时神经系统毒性也较低。由于研究纳入文献数量有限,可能存在发表偏倚,故仍需更多大样本量、高质量的临床研究进一步证实本研究的结果和结论。
基金supported by the key project of the National Natural Science Foundation of China(No.30430790)the major project of the national science and technology of China for new drugs development(No.2009ZX09310-004)~~
基金Supported by the Key Teacher Foundation of Ministry of Education of China, No. 1869 Young Teacher Foundation of Department of Education of Anhui Province, No. 2000jp112
文摘AIM:To study the anti-hepatocarcinoma effects of 5-fluorouracil (5-Fu) encapsulated by galactosylceramide liposomes (5-Fu-GCL) in vivo and in vitro. METHODS: Tumor-bearing animal model and HepA cell line were respectively adopted to evaluate the anti-tumor effects of 5-Fu-GCL in vivo and in vitro. Tumor cell growth inhibition effects of 5-Fu-GCL in vitro were assessed by cell viability assay and MTT assay. In vivo experiment, the inhibitory effects on tumor growth were evaluated by tumor inhibition rate and animal survival days. High performance liquid chromatography was used to detect the concentration-time course of 5-Fu-GCL in intracellular fluid in vitro and the distribution of 5-Fu-GCL in liver tumor tissues in vivo. Apoptosis and cell cycle of tumor cells were demonstrated by flow cytometry. RESULTS: In vitro experiment, 5-Fu-GCL (6.25-100 μmol/L) and free 5-Fu significantly inhibited HepA cell growth. Furthermore, IC50 of 5-Fu-GCL (34.5 μmol/L) was lower than that of free 5-Fu (51.2 μmol/L). In vivo experiment, 5-Fu-GCL (20, 40, 80 mg/kg) significantly suppressed the tumor growth in HepA bearing mice model. Compared with free 5-Fu, the area under curve of 5-Fu-GCL in intracellular fluid increased 2.6 times. Similarly, the distribution of 5-Fu-GCL in liver tumor tissues was significantly higher than that of free 5-Fu. After being treated with 5-Fu-GCL, the apoptotic rate and the proportion of HepA cells in the S phase increased, while the proportion in the G0/G1 and G2/M phases decreased. CONCLUSION: 5-Fu-GCL appears to have anti-hepatocarcinoma effects and its drug action is better than free 5-Fu. Its mechanism is partly related to increased drug concentrations in intracellular fluid and liver tumor tissues, enhanced tumor cell apoptotic rate and arrest of cell cycle in S phase.
文摘Antioxidants are used to minimize lipid oxidation. Antioxidants can act as metal chelators and free radical or oxygen scavengers, which can slow the progression of lipid oxidation. Lipid oxidation may have negative effects on the quality of meat and meat products, causing changes in sensory attributes such as color, texture, odor and flavor, and nutritional quality. Several synthetic antioxidants have been used to successfully prevent lipid oxidation in the meat industry, but consumers are concerned about the health risks related to consumption of some synthetic antioxidants. Therefore, there has been a growing interest in natural antioxidants. Nowadays, compounds obtained from natural sources such as grains, oilseeds, spices, fruit and vegetables have been investigated to decrease the lipid oxidation. In this review, the potential effects of natural antioxidants were evaluated that are widely used in meat and meat products.
基金Supported by National Natural Science Foundation of China (30700373)
文摘Objective To investigate the role of acyl-coenzyme A:cholesterol acyltransferase inhibitor(ACATI) in apoptosis induced by lipids and whether lipids-induced apoptosis is accompanied by increase of free cholesterol in endoplasmic reticulum(ER),in order to further understand the mechanism of lipids-induced apoptosis in advanced atherosclerosis.Methods Human vascular smooth muscle cells(VSMCs) and phorbol 12-myristate 13-acetate(PMA) differentiated THP-1 macrophages were used.Tritiated thymidine incorporation was applied to detect cell proliferation.Cytotoxicity was assessed by lactate dehydrogenase(LDH) release.4',6-diamidino-2-phenylindole(DAPI) staining,caspase-3,-7 assay,and Annexin-V/propidium iodide(PI) staining were used to detect apoptosis.High performance liquid chromatography was used in intracellular free cholesterol and cholesterol ester assay.ER free cholesterol was quantified.Results Different lipids had different effects on proliferation and cytotoxicity of VSMCs.25-hydroxycholesterol(25OHC) had biphasic effects on the proliferation of VSMCs.At low concentration,it stimulated cell proliferation,but turned to proliferation inhibition as concentration reached 15 μg/mL.25OHC and acetylated low density lipoprotein(AcLDL) could respectively induce apoptosis in human VSMCs and PMA differentiated THP-1 macrophages,which was aggravated by ACATI,accompanied by increase of intracellular free cholesterol content.There was also an increase of cholesterol content in ER with AcLDL-induced apoptosis in THP-1 macrophages.Conclusions Lipids could induce apoptosis,accompanied by increase of intracellular free cholesterol content,which could be augmented by ACATI,suggesting that insults resulting in ER free cholesterol rise might be the initiator of apoptosis.
基金Supported by a grant from the Qingdao Public Sphere Sci-technical Support Project(No.09-1-1-13-nsh)
文摘Objective： The purpose of the study is to investigate the effects of up-regulation of Raf kinase inhibitor protein （RKIP） on the chemosensitivity of cervical cancer Hela cells. Methods： Eukaryotic expression plasmid pcDNA3.1（±）-ssRKIP containing human overall length RKIPcDNA was transfected into cervical cancer Hela cell by lipofectin assay, establishing a stable cell line containing a target gene by G418. Expression of RKIP in Hela cells was measured by Western blot analysis. After treatment with cisplatin of different concentrations and intervals of time, the effect of RKIP on the proliferation of Hela cells was evaluated by MTT method. The flow cytometry was used to investigate whether the RKIP could inhibit apoptosis in Hela cells induced by cisplatin. Results： The expression of RKIP in Hela cells transfected with pcDNA3.1-ssRKIP was increased obviously. After different concentrations of cisplatin treatment cells for 24, 48 and 72 h, the growth inhibition rate in Hela cells transfected with pcDNA3.1-ssRKIP was significantly higher than in control cells （P 〈 0.05）. With 5 pg/mL cisplatin treatment for 24 h, pcDNA3.1-ssRKIP-transfected Hela cells had an obviously higher percentage of apoptosis （23.2 ± 0.24）% than non-transfected cells （12.4 ± 0.31）% and empty vector-transfected cells （13.4 ± 0.47）%. Without treatment of cisplatin, the percentage of apoptosis for Hela cells transfected with pcDNA3.1-ssRKIP was （5.7 ± 0.12）%, which was still higher than those of the non-transfected cells （2.9 ± 0.21）% and empty vector-transfected cells （3 ± 0.08）%. Conclusion： Higher expres- sion of RKIP gene can improve chemosensitivitv of cervical cancer Hela cells to cisplatin.
