Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 7 de 7
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Yao Xue Xue Bao ; 51(8): 1309-15, 2016 08.
Artigo em Chinês | MEDLINE | ID: mdl-29906035

RESUMO

In this study, we used Shirasu porous glass membrane(SPG) as a template and hydroxy camptothecin (HCPT) as a model drug to prepare the comet-shaped Me PEG [methoxyl poly(ethylene glycol)]- PLGA [poly(lactic-co-glycolic acid)-HCPT amphiphilic block copolymer. Our method was optimized by the orthogonal design method. The partical size, zeta potential, drug-loaded content, yield, shape and status of the obtained comet-shaped Me PEG-PLGA-HCPT particles were further characterized by dynamic light scattering(DLS), scanning electron microscopy(SEM)/transmission electron microscopy (TEM), X-ray diffraction(XRD) and differential scanning calorimetry (DSC) et al, respectively. In vitro release was preliminary evaluated. MTT assay to preliminary evaluate the cytotoxicity of particles against human liver BEL-7402 cells. Based on these experimental results, the optimal preparation conditions contain: weight ratio of HCPT to Me PEG-PLGA was 1:1, nitrogen pressure was 100 k Pa and SPG membrane pore size was 1.1 µm. The particles exhibited a comet-shaped shape, fairly uniform size and were well dispersed. The drug-loading content was 46.2%, with yield of 96.4%, and zeta-31.4 m V. The distribution of HCPT in particles was very uniform, and HCPT showed a amorphous state existed in particles. The release behavior in vitro showed sustained releasing, and with the drug loading content in proportion to the release of the drug. MTT test indicated that the HCPT-loaded comet-shaped particles had enhanced the cytotoxicity against human liver BEL-7402 cells relatively to the HCPT-loaded spherical particles in vitro. The results showed a promising potential application of the preparation in clinical treatment of tumor.


Assuntos
Camptotecina/administração & dosagem , Portadores de Fármacos/química , Ácido Láctico/química , Ácido Poliglicólico/química , Varredura Diferencial de Calorimetria , Linhagem Celular , Humanos , Nanopartículas , Tamanho da Partícula , Copolímero de Ácido Poliláctico e Ácido Poliglicólico , Difração de Raios X
2.
J Biomed Mater Res B Appl Biomater ; 100(5): 1179-89, 2012 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-22454303

RESUMO

A composite rod for fracture fixation using chitosan (CHI)/hydroxylapatite (HA) was prepared by means of in situ precipitation, which had a layer-by-layer structure, good mechanical properties, and cell compatibilities. The CHI/HA composite rods were precipitated from the chitosan solution with calcium and phosphorus precursors, followed by treatment with a tripolyphosphate-trisodium phosphate solution (pH >13) to crosslink the CHI and to hydrolyze the calcium phosphates to nanocrystalline HA. The results of FTIR, XRD, and TEM measurements confirmed that HA had been formed within the CHI matrix. The effects of the CHI/HA ratios (20/0, 20/1, 20/2, 20/4, and 20/5, w/w) on the mechanical properties were investigated. At the CHI/HA ratio of 20/4 (w/w), the bending strength and modulus of the rods were 133 MPa and 6.8 GPa, respectively. Pre-osteoblast MC3T3-E1 cells were cultured in an extract of the CHI/HA rods (20/4, w/w) to study the cell compatibilities of the composite. The observations indicated that the CHI/HA composite could promote the growth of MC3T3-E1 cells better than the composite without HA (p < 0.05). Furthermore, the co-cultivation of the cells and the CHI/HA composite showed that cells fully spread on the surface of the composite with an obvious cytoskeleton organization, which also revealed that the CHI/HA composite had a good biocompatibility.


Assuntos
Substitutos Ósseos/química , Quitosana/química , Durapatita/química , Teste de Materiais , Nanopartículas/química , Animais , Linhagem Celular , Fraturas Ósseas/terapia , Camundongos
3.
Biochem Biophys Res Commun ; 379(2): 643-8, 2009 Feb 06.
Artigo em Inglês | MEDLINE | ID: mdl-19121628

RESUMO

Carbon nanotubes (CNTs) have potential applications in biosensors, tissue engineering, and biomedical devices because of their unique physico-chemical, electronic and mechanical properties. However, there is limited literature data available concerning the biological properties and toxicity of CNTs. This study aimed to assess the toxicity exhibited by multi-walled CNTs (MWCNTs) and to elucidate possible molecular mechanisms underlying the biological effects of MWCNTs in A549 cells. Exposing A549 cells to MWCNTs led to cell death, changes in cell size and complexity, reactive oxygen species (ROS) production, interleukin-8 (IL-8) gene expression and nuclear factor (NF)-kappaB activation. Treatment of A549 cells with antioxidants prior to adding MWCNTs decreased ROS production and abrogated expression of IL-8 mRNA. Pretreatment of A549 cells with NF-kappaB inhibitors suppressed MWCNTs-induced IL-8 mRNA expression. These results indicate that MWCNTs are able to induce expression of IL-8 in A549 cells, at least in part, mediated by oxidative stress and NF-kappaB activation.


Assuntos
Interleucina-8/metabolismo , NF-kappa B/metabolismo , Nanotubos de Carbono/toxicidade , Estresse Oxidativo , Espécies Reativas de Oxigênio/metabolismo , Apoptose , Linhagem Celular Tumoral , Expressão Gênica , Humanos , Inflamação/induzido quimicamente , Inflamação/imunologia , Interleucina-8/genética , NF-kappa B/antagonistas & inibidores , Regulação para Cima
4.
Yao Xue Xue Bao ; 42(4): 376-80, 2007 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-17633203

RESUMO

This study is to investigate the effect of curcumin on the induction of glutathione S-transferases (GST) and NADP(H):quinone oxidoreductase (NQO) and explore their possible molecular mechanism. The activity of GST, NQO and cellular reduced glutathione (GSH) content were measured by spectrophotometrical methods. Cellular changes in the distribution of NF-E2 related factor 2 (Nrf2) were detected by Western blotting analysis. Nrf2-AREs (antioxidant-responsive elements) binding activity was examined by electrophoretic mobility shift assay (EMSA). Treatment of HT-29 human colon adenocarcinoma cells with curcumin dramatically induced the activity of GST and NQO at the range of 10-30 micromol x L(-1). Curcumin exposure caused a significant increase in cellular GSH content rapidly as early as 3 h. Moreover, curcumin triggered the accumulation of Nrf2 in nucleus, and increased Nrf2 content in ARE complexes. These results demonstrated that induction of GST and NQO activity by curcumin may be mediated by translocation of transcription factor Nrf2 from cytoplasm to nuclear and increased binding activity of Nrf2-ARE complexes.


Assuntos
Curcumina/farmacologia , Glutationa Transferase/metabolismo , NAD(P)H Desidrogenase (Quinona)/metabolismo , Fator 2 Relacionado a NF-E2/metabolismo , Antineoplásicos/farmacologia , Antioxidantes/metabolismo , Núcleo Celular/metabolismo , Indução Enzimática/efeitos dos fármacos , Glutationa/metabolismo , Células HT29 , Humanos , Elementos de Resposta/efeitos dos fármacos , Transdução de Sinais
5.
Phytother Res ; 21(10): 948-53, 2007 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-17602436

RESUMO

Phellinus linteus (PL) mushroom has been reported to possess antioxidant activity. The present study was designed to investigate whether an ethanol extract obtained from PL might ameliorate oxidative stress and enhance antioxidant enzyme activities in primary rat hepatocytes, which were overloaded with iron using ferric nitrilotriacetate (FeNTA) complex. FeNTA enables hepatocytes to accumulate substantially redox-active iron and stimulates the production of injurious hydroxyl radicals, which in turn, initiate oxidative stress-mediated cytotoxicity. The results showed that pretreatment of hepatocytes with PL extract (50, 100 and 200 microg/mL) for 24 h significantly reversed FeNTA-induced cell viability loss, lactate dehydrogenase leakage (LDH), lipid peroxidation (LPO) and protein carbonyl formation in a dose-dependent manner. It was further observed that PL extract produced an inhibitory effect on intracellular reactive oxygen species (ROS) formation caused by FeNTA. Concomitantly, the amount of GSH content and the activities of glutathione reductase (GSH Rd) and glutathione peroxidase (GSH Px) in hepatocytes pretreated with PL extract increased substantially compared with those treated with FeNTA alone. These results suggest that PL may be useful in protecting against FeNTA-induced oxidative damage and also be capable of attenuating cytotoxicity of other oxidants.


Assuntos
Antioxidantes/farmacologia , Basidiomycota/química , Compostos Férricos/toxicidade , Ácido Nitrilotriacético/análogos & derivados , Estresse Oxidativo/efeitos dos fármacos , Polissacarídeos/farmacologia , Animais , Antioxidantes/isolamento & purificação , Antioxidantes/toxicidade , Células Cultivadas , Misturas Complexas/isolamento & purificação , Misturas Complexas/farmacologia , Misturas Complexas/toxicidade , Glutationa/metabolismo , Hepatócitos/efeitos dos fármacos , Hepatócitos/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Masculino , Ácido Nitrilotriacético/toxicidade , Phellinus , Extratos Vegetais , Polissacarídeos/isolamento & purificação , Carbonilação Proteica/efeitos dos fármacos , Ratos , Ratos Sprague-Dawley , Espécies Reativas de Oxigênio/metabolismo
6.
Zhongguo Yi Xue Ke Xue Yuan Xue Bao ; 28(5): 690-4, 2006 Oct.
Artigo em Chinês | MEDLINE | ID: mdl-17121233

RESUMO

OBJECTIVE: To study the effectiveness of treating hepatocellular carcinoma (HCC) in mice with locally administered epirubicin-loaded poly( D, L) - lactic acid microspheres (EPI-PLA-MS ). METHODS: EPI-PLA-MS was prepared with double emulsion solvent evaporation technique. Five groups of mice (n = 8 in each group) were intraperitoneally injected with five different doses of free epirubicin (FEPI), and the maximum tolerated dose (MTD) was calculated. Then 15 mice with transplanted subcutaneous H22 HCC were divided into three groups (n = 5), which were respectively intratumorally injected with normal saline (NS), blank microspheres, and EPI-PLA-MS (with 9 mg/kg of EPI). After two weeks the tumors were excised and weighed. Another 15 mice with transplanted H22 ascites HCC were divided into three groups (n = 5), which were intraperitonealy injected with the same drugs, and the increased life span were registered exactly. RESULTS: The MTD of intraperitoneally injected FEPI was 9 mg/kg. The tumour-inhibiting rates was 40.35% and 36.09% when EPI-PLA-MS were administered by intratumoral injection to the mice with subcutaneous H22 HCC. It significantly prolonged the survival time of mice with H22 ascites HCC and the increased life span by 153.49% and 142.22% when EPI-PLA-MS were intraperitoneally administered. CONCLUSION: EPI-PLA-MS is a new sustained-release preparation with high-efficacy and low-toxicity in treating HCC and has shown promising prospects when administered locally.


Assuntos
Antibióticos Antineoplásicos/administração & dosagem , Epirubicina/administração & dosagem , Neoplasias Hepáticas Experimentais/tratamento farmacológico , Animais , Preparações de Ação Retardada , Portadores de Fármacos , Injeções Intraperitoneais , Ácido Láctico/farmacologia , Masculino , Camundongos , Camundongos Endogâmicos , Microesferas , Poliésteres , Polímeros/farmacologia
7.
Yao Xue Xue Bao ; 40(1): 57-64, 2005 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-15881329

RESUMO

AIM: To study the stability of insulin-loaded polybutylcyanoacrylate nanoparticles (IPN) in an oily medium (soybean oil containing 0.5% (v/v) Tween-20 and 5% (v/v) Vitamin E) along with the hypoglycemic effect following their oral administration to streptozotocin (STZ) induced diabetic rats. METHODS: The stability of IPN in the process was appraised by measurement of the amount of undegraded insulin associated to nanoparticles, the average size and the span of IPN, as well as the release of insulin from IPN. IPN in an aqueous medium (containing 0.5% (v/v) Tween-20) at pH 2.0 was also investigated as control. RESULTS: The study showed that IPN in the oily medium was more stable than that in the aqueous medium over one year of storage in the dark at (25 +/- 2) degrees C and the in vitro stability of IPN in the oily medium against degradation by proteolytic enzymes was much better than that in the aqueous medium. The apparent bioavailability of an oral administration of IPN (50 u x kg(-1)) in the oily medium versus an (sc) injection of insulin (2 u x kg(-1)) was 22.4%, much higher than that of IPN in the aqueous medium (15.5%), based on decreased areas above curve (AAC) determination for the blood glucose depression from time zero to 144 h of a single oral administration of IPN to STZ-diabetic rats. CONCLUSION: IPN in soybean oil containing Tween-20 (0.5% v/v) and Vitamin E (5% v/v) could be considered as an effective and stable delivery system for oral insulin.


Assuntos
Diabetes Mellitus Experimental/metabolismo , Sistemas de Liberação de Medicamentos , Embucrilato , Insulina/farmacologia , Administração Oral , Animais , Disponibilidade Biológica , Glicemia/metabolismo , Portadores de Fármacos , Estabilidade de Medicamentos , Hipoglicemiantes/administração & dosagem , Hipoglicemiantes/farmacocinética , Hipoglicemiantes/farmacologia , Insulina/administração & dosagem , Insulina/farmacocinética , Masculino , Nanoestruturas , Tamanho da Partícula , Polímeros , Ratos , Ratos Wistar , Óleo de Soja
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...