共查询到20条相似文献,搜索用时 15 毫秒
1.
由于具有高效靶向药物传递的潜力,病毒颗粒已成为药物和生命科学领域的研究焦点.病毒颗粒具有病毒性载体和非病毒性载体的优点,同时克服了两者的局限性.病毒颗粒药物传递系统具有无毒、生物相容性、生物可降解性和非自动免疫等特点.研究表明,病毒颗粒能够在细胞间转运多种具有生物活性的分子,例如核酸或者基因、多肽、蛋白质以及其它抗癌药物等,因此在疾病治疗方面可能具有重要作用.如何制备携带有生物活性材料和治疗试剂的病毒颗粒和确定病毒颗粒药物的最佳剂型是目前该领域中挑战性的课题.本文综述了病毒颗粒技术多方面的特征及应用前景. 相似文献
2.
Ruei-Min Lu Min-Shan Chen De-Kuan Chang Chien-Yu Chiu Wei-Chuan Lin Shin-Long Yan Yi-Ping Wang Yuan-Sung Kuo Chen-Yun Yeh Albert Lo Han-Chung Wu 《PloS one》2013,8(6)
Targeted delivery of drugs to tumors represents a significant advance in cancer diagnosis and therapy. Therefore, development of novel tumor-specific ligands or pharmaceutical nanocarriers is highly desirable. In this study, we utilized phage display to identify a new targeting peptide, SP90, which specifically binds to breast cancer cells, and recognizes tumor tissues from breast cancer patients. We used confocal and electron microscopy to reveal that conjugation of SP90 with liposomes enables efficient delivery of drugs into cancer cells through endocytosis. Furthermore, in vivo fluorescent imaging demonstrated that SP90-conjugated quantum dots possess tumor-targeting properties. In tumor xenograft and orthotopic models, SP90-conjugated liposomal doxorubicin was found to improve the therapeutic index of the chemotherapeutic drug by selectively increasing its accumulation in tumors. We conclude that the targeting peptide SP90 has significant potential in improving the clinical benefits of chemotherapy in the treatment and the diagnosis of breast cancer. 相似文献
3.
R. Ravichandran 《NanoBioTechnology》2009,5(1-4):17-33
In recent years, there has been a considerable interest in the development of novel drug delivery systems using nanotechnology. Nanoparticles represent a promising drug delivery system of controlled and targeted release. In this context, nanosuspensions will be effective in increasing the solubility and bioavailability of poorly soluble drugs. This review focuses on advantages, method of preparation, physical characteristics, and evaluation of drug nanosuspensions. 相似文献
4.
This work is focused on production of enteric-coated micro-particles for oral administration, using a water-in-oil-in-water
solvent evaporation technique. The active agent theophylline was first encapsulated in cellulose acetate phthalate (CAP),
a pH-sensitive well-known polymer, which is insoluble in acid media but dissolves at neutral pH (above pH 6). In this first
step, CAP was chosen with the aim optimizing the preparation and characterization methods. The desired release pattern has
been obtained (low release at low pH, higher release at neutral pH) but in presence of a low encapsulation efficiency. Then,
the CAP was replaced by a novel-synthesized pH-sensitive poly(methyl methacrylate–acrylic acid) copolymer, poly(MMA–AA). In
this second step, the role of two process parameters was investigated, i.e., the percentage of emulsion stabilizer (polyvinyl
alcohol, PVA) and the stirring power for the double emulsion on the encapsulation efficiency. The encapsulation efficiency
was found to increase with PVA percentage and to decrease with the stirring power. By increasing the PVA content and by decreasing
the stirring power, a high stable double emulsion was obtained, and this explains the increase in encapsulation efficiency
found. 相似文献
5.
Shlapakova T. I. Tyagunova E. E. Kostin R. K. Danilova D. A. 《Russian Journal of Bioorganic Chemistry》2021,47(2):376-379
Russian Journal of Bioorganic Chemistry - Currently, brain tumors are becoming more common and their clinical picture is aggravated by serious complications. According to the statistics of the... 相似文献
6.
Colon-specific drug delivery systems (CDDS) are desirable for the treatment of a range of local diseases such as ulcerative colitis, Crohn’s disease, irritable bowel syndrome, chronic pancreatitis, and colonic cancer. In addition, the colon can be a potential site for the systemic absorption of several drugs to treat non-colonic conditions. Drugs such as proteins and peptides that are known to degrade in the extreme gastric pH, if delivered to the colon intact, can be systemically absorbed by colonic mucosa. In order to achieve effective therapeutic outcomes, it is imperative that the designed delivery system specifically targets the drugs into the colon. Several formulation approaches have been explored in the development colon-targeted drug delivery systems. These approaches involve the use of formulation components that interact with one or more aspects of gastrointestinal (GI) physiology, such as the difference in the pH along the GI tract, the presence of colonic microflora, and enzymes, to achieve colon targeting. This article highlights the factors influencing colon-specific drug delivery and colonic bioavailability, and the limitations associated with CDDS. Further, the review provides a systematic discussion of various conventional, as well as relatively newer formulation approaches/technologies currently being utilized for the development of CDDS.KEY WORDS: colon targeting, factors affecting colon delivery, future trends, novel approaches, traditional approaches 相似文献
7.
Yingnan Si Seulhee Kim Eric Zhang Yawen Tang Renata Jaskula‐Sztul James M. Markert Herbert Chen Lufang Zhou Xiaoguang Liu 《Biotechnology journal》2020,15(1)
Exosomes hold great potential to deliver therapeutic reagents for cancer treatment due to its inherent low antigenicity. However, several technical barriers, such as low productivity and ineffective cancer targeting, need to be overcome before wide clinical applications. The present study aims at creating a new biomanufacturing platform of cancer‐targeted exosomes for drug delivery. Specifically, a scalable, robust, high‐yield, cell line based exosome production process is created in a stirred‐tank bioreactor, and an efficient surface tagging technique is developed to generate monoclonal antibody (mAb)‐exosomes. The in vitro characterization using transmission electron microscopy, NanoSight, and western blotting confirm the high quality of exosomes. Flow cytometry and confocal laser scanning microscopy demonstrate that mAb‐exosomes have strong surface binding to cancer cells. Furthermore, to validate the targeted drug delivery efficiency, romidepsin, a histone deacetylase inhibitor, is loaded into mAb‐exosomes. The in vitro anti‐cancer toxicity study shows high cytotoxicity of mAb‐exosome‐romidepsin to cancer cells. Finally, the in vivo study using tumor xenograft animal model validates the cancer targeting specificity, anti‐cancer efficacy, and drug delivery capability of the targeted exosomes. In summary, new techniques enabling targeted exosomes for drug delivery are developed to support large‐scale animal studies and to facilitate the translation from research to clinics. 相似文献
8.
A. A. Rosenkranz V. G. Lunin O. V. Sergienko D. G. Gilyazova O. L. Voronina D. E. Jans A. A. Kofner M. A. Shumiantseva A. F. Mironov A. S. Sobolev 《Russian Journal of Genetics》2003,39(2):198-206
A number of drugs are regarded as possessing local activity because their effects take place at an extremely short distance from their location site in the cell. The response of different cellular compartments to these effects is different. Such substances as photosensitizers (PSs), which are used in photodynamic cancer therapy, should be targeted to the cell compartments where their effect is the most pronounced. This study describes the construction and properties of the chimeric modular recombinant transporters (MRTs) expressed in Escherichia coli and used for PS targeting. These constructs include (1) the -melanocyte-stimulating hormone as a ligand module, which is internalized by the target cells (mouse melanoma); (2) the optimized SV40 large T-antigen nuclear localization signal; (3) the hemoglobin-like protein from E. coli as a carrier module; (4) the endosomolytic module, the translocation domain of the diphtheria toxin. These MRTs were used for PS targeting to the mouse melanoma cell nuclei, the most PS-damaged intracellular compartment, which resulted in a PS photocytotoxic effect increase of several orders of magnitude. In our opinion, MRTs, which target locally active drugs into the desired cell compartment and thereby enhance the drug response, represent a new generation of the pharmacological agents. 相似文献
9.
外泌体是由细胞分泌、粒径为30~ 150 nm的纳米囊泡.外泌体具有优越的生物相容性、良好的载药功能以及便于修饰的膜表面,是一种具有潜力的药物递送载体.在肿瘤治疗研究中,可利用具有靶向识别功能的外泌体来降低脱靶效应,减少不良反应,达到增强治疗效果的目的 .归纳了用不同修饰方法增强外泌体靶向性的研究进展,总结了近五年来利... 相似文献
10.
Liposome, a kind of nanoscale vesicle, is applied in the drug delivery systems (DDS) extensively because of its low toxicity, biodegradability and biocompatibility. However, defects of liposome drugs, such as low rates of drug release, insufficiency in active targeting and inefficient bioavailability still remain to be solved. Therefore, stimuli-responsive liposomes are brought to DDS to improve the efficacy of controlled drug release, assure specific release in targeted sites and alleviate side-effects as much as possible. Stimuli-responsive liposomes could maintain stability in circulation, tissues and cells under physiological conditions. Once delivered, they could be activated by relevant internal or external stimuli to release cargos accurately in target areas. This review highlights the design, functional principles and recent advances on application of pH-sensitive liposomes and thermosensitive liposomes respectively, which are two typical stimuli-responsive liposomes. Common targeting modifications of liposomes are discussed as well. We also summarize recent challenges of stimuli-responsive liposomes and their further applications. 相似文献
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12.
Rutian Li Wei Wu Qin Liu Puyuan Wu Li Xie Zhenshu Zhu Mi Yang Xiaoping Qian Yin Ding Lixia Yu Xiqun Jiang Wenxian Guan Baorui Liu 《PloS one》2013,8(7)
Aims
The matrix metalloproteinase (MMP) 2/9, also known as collagenases IV and gelatinases A/B, play a key role in cancer invasion and metastasis. However, the clinical trials of the MMP inhibitors (MMPIs) ended up with disappointing results. In this paper, we synthesized a gelatinase-responsive copolymer (mPEG-PCL) by inserting a gelatinase cleavable peptide (PVGLIG) between mPEG and PCL blocks of mPEG-PCL for anticancer drug delivery to make use of MMP2/9 as an intelligent target for drug delivery.Materials and Methods
mPEG-pep-PCL copolymer was synthesized via ring-opening copolymerization and double-amidation. To evaluate whether Nanoparticles (NPs) prepared from this copolymer are superior to NPs prepared from mPEG-PCL, NPs prepared from mPEG-PCL copolymer were used as positive control. Docetaxel-loading NPs using mPEG-pep-PCL and mPEG-PCL were prepared by nano-precipitation method, mentioned as Gel-NPs and Con-NPs, respectively. The morphologic changes of the NPs after treatment with gelatinases were observed macroscopically by spectrophotometer and microscopically by transmission electron microscopy (TEM) and atomic force microscopy (AFM). The cellular uptake amount and cytotoxicity of Gel-NPs and Con-NPs, respectively, in cell lines with different levels of gelatinase expression were studied. Moreover, the cytotoxicity study on the primary cancer cells isolated from pericardial fluids from a patient with late-stage lung cancer was conducted.Results
The Gel-NPs aggregated in response to gelatinases, which was confirmed macroscopically and microscopically. The cellular uptake amount of Gel-NPs was correlated with the level of gelatinases. The in vitro antitumor effect of Gel-NPs was also correlated with the level of gelatinases and was superior to Taxotere (commercially available docetaxel) as well as the Con-NPs. The cytotoxicity study on the primary lung cancer cells also confirmed the effectiveness of Gel-NPs.Conclusion
The results in this study preliminarily demonstrated the effectiveness of gelatinase-responsive targeting strategy and the prospect of this intelligent nano-drug delivery system though further studies are needed. 相似文献13.
生物可降解聚合物纳米粒给药载体 总被引:4,自引:0,他引:4
生物可降解聚合物纳米粒用于给药载体具有广阔的前景。本文综述了生物可降解聚合物纳米粒给药载体领域的最新进展 :包括纳米粒表面修饰特性、药物释放、载多肽和蛋白质等生物大分子药物传输中的潜在应用。 相似文献
14.
新型纳米靶向给药系统的研究与开发对于难治愈性疾病(尤其是肿瘤)的治疗具有重大意义,而其发展很大程度上取决于载体材料 的设计。构思巧妙、设计合理的载体材料能使载体实现靶向功能,将药物定位浓集于病灶部位,并最大限度地发挥高效低毒的作用。基于 不同的靶向策略,包括被动靶向、主动靶向和响应肿瘤微环境的靶向,综述了近年来一些新型纳米载体材料的设计,为新型纳米靶向给药 系统的研究提供参考。 相似文献
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生物可降解嵌段共聚物在给药载体中的应用 总被引:3,自引:0,他引:3
生物可降解嵌段聚合物因具有双亲性 ,靶向药物到特定部位等优点大大推动了作为给药载体系统的发展。本文综述了生物可降解嵌段聚合物在表面修饰、水凝胶、胶束、生物大分子载体系统中的应用 相似文献
17.
Neurochemical Research - Parkinson’s disease (PD) is a common central nervous system disorder (CNS) characterized by cell loss in the substantia nigra. Severe loss of dopaminergic neurons and... 相似文献
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This work sets out to study the effect of hydrophobic molecules on the morphology of aqueous solutions of amphiphilic block copolymer, which has potential drug delivery applications. The effect is studied both experimentally and by using simulations. Using cryogenic TEM observations, micelles can clearly be visualised and their core size measured. While pure polymer solutions form into spherical micelles with a narrow size distribution, addition of small amounts of hydrophobic drug molecules leads to distortions in shape, a wider size distribution, and larger average core diameter. Simulations are based on a mesoscale dynamic density functional method with Gaussian chain Hamiltonian and mean-field interactions, as implemented in the MesoDyn code. With parameters for the amphiphilic system established in earlier work, and mean-field interactions for the drug molecule derived from structure–property relationships, we obtain good agreement with the TEM observations for the effect of the hydrophobic molecules on the morphology. The simulations clearly show how increasing drug concentration leads to an increase in micelle size, a wider distribution and more elongated rather than spherical micelles. 相似文献
20.
Russian Journal of Bioorganic Chemistry - Targeted drug delivery is a new method in the therapy of various diseases, especially cancer. Typically the therapeutic drug is encapsulated into the... 相似文献