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1.
Mol Ther ; 26(12): 2779-2797, 2018 12 05.
Artigo em Inglês | MEDLINE | ID: mdl-30266653

RESUMO

Liver sinusoidal endothelial cells (LSECs) have great capacity for liver regeneration, and this capacity can easily switch to profibrotic phenotype, which is still poorly understood. In this study, we elucidated a potential target in LSECs for regenerative treatment that can bypass fibrosis during chronic liver injury. Proregenerative LSECs can be transformed to profibrotic phenotype after 4 weeks of carbon tetrachloride administration or 10 days of bile duct ligation. This phenotypic alternation of LSECs was mediated by extracellular regulated protein kinases 1 and 2 (Erk1/2)-Akt axis switch in LSECs during chronic liver injury; Erk1/2 was normally associated with maintenance of the LSEC proregenerative phenotype, inhibiting hepatic stellate cell (HSC) activation and promoting tissue repair by enhancing nitric oxide (NO)/reactive oxygen species (ROS) ratio and increasing expression of hepatic growth factor (HGF) and Wingless-type MMTV integration site family member 2 (Wnt2). Alternatively, Akt induced LSEC profibrotic phenotype, which mainly stimulated HSC activation and concomitant senescence by reducing NO/ROS ratio and decreasing HGF/Wnt2 expression. LSEC-targeted adenovirus or drug particle to promote Erk1/2 activity can alleviate liver fibrosis, accelerate fibrosis resolution, and enhance liver regeneration. This study demonstrated that the Erk1/2-Akt axis acted as a switch to regulate the proregenerative and profibrotic phenotypes of LSECs, and targeted therapy promoted liver regeneration while bypassing fibrosis, providing clues for a more effective treatment of liver diseases.


Assuntos
Hepatopatias/metabolismo , Hepatopatias/patologia , Regeneração Hepática , Proteína Quinase 1 Ativada por Mitógeno/metabolismo , Proteína Quinase 3 Ativada por Mitógeno/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Transdução de Sinais , Animais , Biomarcadores , Doença Crônica , Modelos Animais de Doenças , Células Endoteliais/efeitos dos fármacos , Células Endoteliais/metabolismo , Imunofluorescência , Células Estreladas do Fígado/efeitos dos fármacos , Células Estreladas do Fígado/metabolismo , Hepatócitos/efeitos dos fármacos , Hepatócitos/metabolismo , Hepatócitos/patologia , Cirrose Hepática/metabolismo , Cirrose Hepática/patologia , Hepatopatias/etiologia , Hepatopatias/terapia , Camundongos , Fenótipo , Transdução de Sinais/efeitos dos fármacos , Serina-Treonina Quinases TOR/metabolismo
2.
Biomaterials ; 113: 243-252, 2017 01.
Artigo em Inglês | MEDLINE | ID: mdl-27829203

RESUMO

Photothermal-based combination therapy using functional nanomaterials shows great promise in eradication of aggressive tumors and improvement of drug sensitivity. The therapeutic efficacy and adverse effects of drug combinations depend on the precise control of timely tumor-localized drug release. Here a polymer-dopamine nanocomposite is designed for combination therapy, thermo-responsive drug release and prevention of uncontrolled drug leakage. The thermo-sensitive co-polymer poly (2-(2-methoxyethoxy) ethyl methacrylate-co-oligo (ethylene glycol) methacrylate)-co-2-(dimethylamino) ethyl methacrylate-b-poly (D, l-lactide-co-glycolide) is constructed into core-shell structured nanoparticles for co-encapsulation of two cytotoxic drugs and absorption of small interfering RNAs against survivin. The drug-loaded nanoparticles are surface-coated with polydopamine which confers the nanoformulation with photothermal activity and protects drugs from burst release. Under tumor-localized laser irradiation, polydopamine generates sufficient heat, resulting in nanoparticle collapse and instant drug release within the tumor. The combination strategy of photothermal, chemo-, and gene therapy leads to triple-negative breast cancer regression, with a decrease in the chemotherapeutic drug dosage to about 1/20 of conventional dose. This study establishes a powerful nanoplatform for precisely controlled combination therapy, with dramatic improvement of therapeutic efficacy and negligible side effects.


Assuntos
Antineoplásicos/uso terapêutico , Preparações de Ação Retardada/uso terapêutico , Indóis/uso terapêutico , Polímeros/uso terapêutico , RNA Interferente Pequeno/uso terapêutico , Neoplasias de Mama Triplo Negativas/terapia , Animais , Antineoplásicos/administração & dosagem , Biomimética , Mama/efeitos dos fármacos , Mama/patologia , Linhagem Celular Tumoral , Terapia Combinada/métodos , Preparações de Ação Retardada/química , Feminino , Humanos , Hipertermia Induzida/métodos , Indóis/química , Proteínas Inibidoras de Apoptose/genética , Camundongos Endogâmicos BALB C , Camundongos Nus , Nanoestruturas/química , Nanoestruturas/uso terapêutico , Fototerapia/métodos , Polímeros/química , RNA Interferente Pequeno/administração & dosagem , RNA Interferente Pequeno/genética , Terapêutica com RNAi/métodos , Proteínas Repressoras/genética , Survivina , Neoplasias de Mama Triplo Negativas/genética , Neoplasias de Mama Triplo Negativas/patologia
3.
Biomaterials ; 80: 169-178, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26708642

RESUMO

Triple-negative breast cancer is a malignant cancer type with a high risk of early recurrence and distant metastasis. Unlike other breast cancers, triple-negative breast cancer is lack of targetable receptors and, therefore, patients largely receive systemic chemotherapy. However, inevitable adverse effects and acquired drug resistance severely constrain the therapeutic outcome. Here we tailor-designed a porphyrin-based micelle that was self-assembled from a hybrid amphiphilic polymer comprising polyethylene glycol, poly (d, l-lactide-co-glycolide) and porphyrin. The bilayer micelles can be simultaneously loaded with two chemotherapeutic drugs with synergistic cytotoxicity and distinct physiochemical properties, forming a uniform and spherical nanostructure. The drug-loaded micelles showed a tendency to accumulate in the tumor and can be internalized by tumor cells for drug release in acidic organelles. Under near-infrared laser irradiation, high density of self-quenched porphyrins in the hydrophobic layer absorbed light efficiently and converted into an excited state, leading to the release of sufficient heat for photothermal therapy. The integration of localized photothermal effect and synergistic chemotherapy conferred great chemosensitivity to cancer cells and achieved tumor regression using about 1/10 of traditional drug dosage. As a result, chemotherapy-associated adverse effects were successfully avoided. Our present study established a novel porphyrin-based nanoplatform with photothermal activity and expanded drug loading capacity, providing new opportunities for challenging conventional chemotherapy and fighting against stubborn triple-negative breast cancer.


Assuntos
Antineoplásicos/administração & dosagem , Mama/efeitos dos fármacos , Hipertermia Induzida/métodos , Micelas , Fotoquimioterapia/métodos , Porfirinas/química , Neoplasias de Mama Triplo Negativas/terapia , Animais , Antineoplásicos/uso terapêutico , Mama/patologia , Linhagem Celular Tumoral , Docetaxel , Doxorrubicina/administração & dosagem , Doxorrubicina/uso terapêutico , Portadores de Fármacos/química , Feminino , Humanos , Camundongos Endogâmicos BALB C , Camundongos Nus , Taxoides/administração & dosagem , Taxoides/uso terapêutico , Neoplasias de Mama Triplo Negativas/patologia
4.
Nanoscale Horiz ; 1(5): 394-398, 2016 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-32260629

RESUMO

Vaccine-based immunotherapy plays an integral role in the development of present and future clinical therapies. Despite the success, there is still a great need to improve the efficiency and safety of vaccines. Nanoparticles have been widely used for improving the efficacy of vaccines by encapsulating the vaccines or using nanoparticles as immune adjuvants. However, the methods for the preparation of nanoparticles are complex with a relatively low encapsulation efficiency of protein vaccine inside the nanocarriers and/or undefined physiochemical properties. Here, we report a new method of preparation of a vaccine by the "in situ" growth of gold clusters in the hepatitis E vaccine (HEVA). The gold cluster grafted HEVA (HEVA/Au) can be easily obtained and there is no loss of HEVA during the preparation process. More importantly, the "in situ" prepared HEVA/Au can not only enhance its immune responses in vivo, but also reduce the potential toxicity of HEVA. Furthermore, the intrinsic fluorescence of gold clusters enables the HEVA to be traceable, which may open a way to track the dynamic behavior of vaccines and further help to optimize an individual therapeutic regimen for immunotherapy.

5.
Nanoscale ; 7(46): 19722-31, 2015 Dec 14.
Artigo em Inglês | MEDLINE | ID: mdl-26556382

RESUMO

In this investigation, we have designed and synthesized a novel core-shell polymer nanoparticle system for highly effective chemo-photothermal combination therapy. A nanoscale DSPE-PEG micelle encapsulating doxorubicin (Dox-M) was designed as a core, and then modified by a polydopamine (PDA) shell for photothermal therapy and bortezomib (Btz) administration (Dox-M@PDA-Btz). The facile conjugation of Btz to the catechol-containing PDA shell can form a reversible pH-sensitive boronic acid-catechol conjugate to create a stimuli-responsive drug carrier system. As expected, the micelle@PDA core-shell nanoparticles exhibited satisfactory photothermal efficiency, which has potential for thermal ablation of malignant tissues. In addition, on account of the PDA modification, both Dox and Btz release processes were pH-dependent and NIR-dependent. Both in vitro and in vivo studies illustrated that the Dox-M@PDA-Btz nanoparticles coupled with laser irradiation could enhance the cytotoxicity, and thus combinational therapy efficacy was achieved when integrating Dox, Btz, and PDA into a single nanoplatform. Altogether, our current study indicated that the micelle@polydopamine core-shell nanoparticles could be applied for NIR/pH-responsive sustained-release and synergized chemo-photothermal therapy for breast cancer.


Assuntos
Bortezomib , Neoplasias da Mama/terapia , Doxorrubicina , Hipertermia Induzida , Indóis , Nanopartículas/química , Polímeros , Bortezomib/química , Bortezomib/farmacologia , Neoplasias da Mama/metabolismo , Neoplasias da Mama/patologia , Doxorrubicina/química , Doxorrubicina/farmacologia , Feminino , Humanos , Células MCF-7 , Micelas
6.
Oncotarget ; 6(27): 23523-32, 2015 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-26143637

RESUMO

Occluding tumor blood supply by delivering the extracellular domain of coagulation-inducing protein tissue factor (truncated tissue factor, tTF) to tumor vasculature has enormous potential to eliminate solid tumors. Yet few of the delivery technologies are moved into clinical practice due to their non-specific tissue biodistribution and rapid clearance by the reticuloendothelial system. Here we introduced a novel tTF delivery method by generating a fusion protein (tTF-pHLIP) consisting of tTF fused with a peptide with a low pH-induced transmembrane structure (pHLIP). This protein targets the acidic tumor vascular endothelium and effectively induces local blood coagulation. tTF-pHLIP, wherein pHLIP is cleverly designed to mimic the natural tissue factor transmembrane domain, triggered thrombogenic activity of the tTF by locating it to the endothelial cell surface, as demonstrated by coagulation assays and confocal microscopy. Systemic administration of tTF-pHLIP into tumor-bearing mice selectively induced thrombotic occlusion of tumor vessels, reducing tumor perfusion and impairing tumor growth without overt side effects. Our work introduces a promising strategy for using tTF as an anti-cancer drug, which has great potential value for clinical applications.


Assuntos
Neoplasias da Mama/metabolismo , Regulação Neoplásica da Expressão Gênica , Proteínas de Membrana/farmacologia , Tromboplastina/farmacologia , Animais , Antineoplásicos/química , Coagulação Sanguínea , Neoplasias da Mama/patologia , Linhagem Celular Tumoral , Membrana Celular/metabolismo , Fator X/metabolismo , Feminino , Células Endoteliais da Veia Umbilical Humana , Humanos , Bicamadas Lipídicas/química , Melanoma Experimental , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , Transplante de Neoplasias , Neovascularização Patológica/tratamento farmacológico , Perfusão , Estrutura Terciária de Proteína , Trombose/patologia
7.
ACS Nano ; 9(2): 1367-78, 2015 Feb 24.
Artigo em Inglês | MEDLINE | ID: mdl-25611071

RESUMO

Effective therapeutics against triple negative breast cancer (TNBC), which has no standard-of-care therapy, needs to be developed urgently. Here we demonstrated a strategy of integrating indocyanine green (ICG), paclitaxel (PTX), and survivin siRNA into one thermosensitive poly(2-(2-methoxyethoxy)ethyl methacrylate-co-oligo(ethylene glycol) methacrylate)-co-2-(dimethylamino)ethyl methacrylate-b-poly(D,L-lactide-co-glycolide) (P (MEO2MA-co-OEGMA-co-DMAEMA)-b-PLGA) nanoparticle (NP-IPS) for triple-punch strategy against TNBC. The NP-IPS significantly enhanced the stability of ICG. Controlled release of the PTX in tumor regions was triggered by the hyperthermia produced by laser irradiated ICG. The NP-IPS exhibited remarkable antitumor efficacy (almost complete ablation of the tumor xenografts) due to the combinational effects of chemotherapy, photothermal therapy, and gene therapy with low drug dose (ICG, 0.32 µmol/kg; PTX, 0.54 µmol/kg; siRNA, 1.5 mg/kg) and minimal side effects. Taken together, our current study demonstrates a nanoplatform for triple-therapy, which reveals a promising strategy for TNBC treatment.


Assuntos
Antineoplásicos/química , Antineoplásicos/farmacologia , Portadores de Fármacos/química , Nanomedicina/métodos , Neoplasias de Mama Triplo Negativas/tratamento farmacológico , Animais , Antineoplásicos/uso terapêutico , Linhagem Celular Tumoral , Portadores de Fármacos/metabolismo , Portadores de Fármacos/farmacocinética , Endocitose , Feminino , Humanos , Verde de Indocianina/química , Proteínas Inibidoras de Apoptose/deficiência , Proteínas Inibidoras de Apoptose/genética , Espaço Intracelular/metabolismo , Ácido Láctico/química , Metacrilatos/química , Camundongos , Camundongos Endogâmicos BALB C , Nanopartículas/química , Paclitaxel/química , Paclitaxel/farmacologia , Paclitaxel/uso terapêutico , Polietilenoglicóis/química , Ácido Poliglicólico/química , Copolímero de Ácido Poliláctico e Ácido Poliglicólico , RNA Interferente Pequeno/química , RNA Interferente Pequeno/genética , Survivina , Neoplasias de Mama Triplo Negativas/genética , Neoplasias de Mama Triplo Negativas/patologia
8.
J Colloid Interface Sci ; 413: 54-64, 2014 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-24183430

RESUMO

A novel amphiphilic copolymer (γ-PGA-co-PLA-DPPE) containing poly(γ-glutamic acid) (γ-PGA), polylactide (PLA), and 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) segments has been successfully synthesized. The chemical structures of the copolymers were characterized by Fourier-transform infrared spectroscopy (FT-IR), NMR ((1)H NMR, (13)C NMR, (31)P NMR), and thermogravimetric analysis (TGA). In order to estimate the feasibility as novel drug carriers, an anti-tumor model drug, doxorubicin hydrochloride salt (DOX) was encapsulated into the copolymers nanoparticles (NPs) by double emulsion and nanoprecipitation methods. The influence of processing factors on encapsulation efficiency and particle size using double emulsion and nanoprecipitation technique were studied. In addition, the DOX-loaded NPs exhibited pH-dependent drug release profiles in vitro. The cumulative release of DOX-loaded NPs was much faster at pH 5.0 than that at pH 7.4. In vitro cytotoxicity test of DOX-loaded NPs against Hela and C666-1 cells demonstrated that DOX-loaded NPs exhibited effectively time-delayed cytotoxicity. Confocal laser scanning microscopy (CLSM) showed that DOX-loaded NPs accumulated mostly in lysosomes instead of cell nucleus, in contrast to free DOX. Therefore, the copolymer nanoparticles were proved to be an available carrier for anti-tumor drug delivery.


Assuntos
Portadores de Fármacos , Nanopartículas , Fosfatidiletanolaminas/química , Ácido Poliglutâmico/análogos & derivados , Linhagem Celular , Doxorrubicina/administração & dosagem , Humanos , Microscopia Eletrônica de Transmissão , Fosfatidiletanolaminas/administração & dosagem , Ácido Poliglutâmico/administração & dosagem , Ácido Poliglutâmico/química , Termogravimetria
10.
J Nanosci Nanotechnol ; 13(2): 1444-7, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23646657

RESUMO

In this paper, novel cyclosporine A (CsA)-loaded amphiphilic poly(L-aspartic acid-co-L-lactic acid) (PAL)-1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) copolymer nanoparticles (NPs) were successfully fabricated using an emulsion/solvent evaporation technique. The CsA-loaded NPs were characterized by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The CsA-loaded NPs size, size distribution, encapsulation efficiency (EE) and drug-loading content (LC) were influenced by polyvinyl alcohol (PVA) concentration and the weight ratio of the copolymer to CsA. In vitro release behavior of CsA-loaded NPs showed a sustained release. With the increasing of copolymer/CsA weight ratio, the release of CsA from NPs is rapid. The poly(L-aspartic acid) derivatives NPs have a promising potential in hydrophobic drug delivery system.

11.
Biomaterials ; 34(13): 3523-33, 2013 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23410678

RESUMO

In this investigation, we have designed and synthesized a multifunctional nanogel for anti-tumor drug delivery. Thermo- and pH-responsive poly (N-isopropyl acrylamide-co-acrylic acid) nanogels (NGs) were synthesized by free radical precipitation polymerization. Positive charged chemotherapeutic drug doxorubicin (DOX) was introduced into the negatively charged swollen NGs by electrostatic adsorption at pH 7.4. Fluorescent bovine serum albumin (BSA) encapsulated gold nanoclusters (AuNCs) were conjugated onto the surface of NGs, followed by functionalization of tumor targeting peptide iRGD onto the BSA for tumor targeting. Interestingly, the DOX-encapsulated iRGD-decorated NGs maintain both thermo- and pH-responsive properties, which are favorable for achieving a controlled drug release in tumor tissues. Stable red fluorescent emission, derived from AuNCs, was used to detect and track the NGs in vitro. As expected, the iRGD motif mediated specific targeting to tumor and endothelial cells and enhanced cellular uptake of the NGs, as demonstrated by flow cytometry and confocal microscopy assays. In vitro cytotoxicity studies proved that the presence of iRGD enhanced the cytotoxic efficiency of DOX to the targeted cells. All together, our current study indicates that the NGs drug-carriers can deliver chemotherapeutic drug specifically to the tumor and endothelial cells with enhanced anti-tumor efficacy and controlled drug release.


Assuntos
Sistemas de Liberação de Medicamentos , Oligopeptídeos/química , Polietilenoglicóis/química , Polietilenoimina/química , Animais , Bovinos , Morte Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Cromatografia Líquida de Alta Pressão , Doxorrubicina/administração & dosagem , Doxorrubicina/farmacologia , Endocitose/efeitos dos fármacos , Fluorescência , Ouro/química , Células Endoteliais da Veia Umbilical Humana/efeitos dos fármacos , Células Endoteliais da Veia Umbilical Humana/metabolismo , Humanos , Hidrodinâmica , Concentração Inibidora 50 , Ligantes , Nanopartículas Metálicas/química , Nanopartículas Metálicas/ultraestrutura , Camundongos , Nanogéis , Tamanho da Partícula , Espalhamento de Radiação , Soroalbumina Bovina/metabolismo , Soluções , Análise Espectral , Frações Subcelulares/efeitos dos fármacos , Frações Subcelulares/metabolismo
12.
Biomaterials ; 33(5): 1627-39, 2012 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-22118775

RESUMO

Targeted delivery strategies are becoming increasingly important. Herein, a novel hyperbranched amphiphilic poly[(amine-ester)-co-(D,L-lactide)]/1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine copolymer (HPAE-co-PLA/DPPE) with RGD peptide (cRGDfK) and transferrin (Tf) on the periphery was synthesized and used to prepare paclitaxel-loaded nanoparticles (NPs) for dual-targeting chemotherapy. These NPs show satisfactory size distribution, high encapsulated efficiency and a pH-dependent release profile. The intrinsic fluorescence of the hyperbranched copolymer renders the detection and tracking of NPs in vitro and in vivo conveniently. In vitro cytotoxicity studies proved that the presence of cRGDfK enhanced the cytotoxic efficiency by 10 folds in α(ν)ß(3) integrin over-expressed human umbilical vein endothelial cells, while Tf improved cytotoxicity by 2 folds in Tf receptor over-expressed human cervical carcinoma cells. The drug-loaded NPs can be efficiently transported into the vascular endothelial cells and the target tumor cells. These results indicate that the cRGDfK and Tf decorated HPAE-co-PLA/DPPE could deliver chemotherapies specifically inside the cell via receptor-mediated endocytosis with greater efficacy. Therefore, such a fluorescent nanocarrier prepared from non-cytotoxic and biodegradable polymers is promising for drug delivery in tumor therapy.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Sistemas de Liberação de Medicamentos/métodos , Nanopartículas/química , Paclitaxel/farmacologia , Peptídeos Cíclicos/química , Polímeros/química , Transferrina/metabolismo , Sobrevivência Celular/efeitos dos fármacos , Portadores de Fármacos/química , Endocitose/efeitos dos fármacos , Células HeLa , Células Endoteliais da Veia Umbilical Humana/citologia , Células Endoteliais da Veia Umbilical Humana/efeitos dos fármacos , Humanos , Concentração Inibidora 50 , Espaço Intracelular/efeitos dos fármacos , Espaço Intracelular/metabolismo , Ligantes , Luz , Espectroscopia de Ressonância Magnética , Nanopartículas/ultraestrutura , Neoplasias/patologia , Polímeros/síntese química , Espalhamento de Radiação , Soluções , Espectrometria de Fluorescência , Espectroscopia de Infravermelho com Transformada de Fourier , Frações Subcelulares/efeitos dos fármacos , Frações Subcelulares/metabolismo , Fatores de Tempo
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