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Blood brain barrier and liposomes

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https://www.readbyqxmd.com/read/27884636/an-in-vitro-and-in-vivo-study-of-peptide-functionalized-nanoparticles-for-brain-targeting-the-importance-of-selective-blood-brain-barrier-uptake
#1
Gerard H Bode, Gregory Coué, Christian Freese, Karin E Pickl, Maria Sanchez-Purrà, Berta Albaiges, Salvador Borrós, Ewoud C van Winden, Leto-Aikaterini Tziveleka, Zili Sideratou, Johan F Engbersen, Smriti Singh, Krystyna Albrecht, Jürgen Groll, Martin Möller, Andy J G Pötgens, Christoph Schmitz, Eleonore Fröhlich, Christian Grandfils, Frank M Sinner, C James Kirkpatrick, Harry W M Steinbusch, Hans-Georg Frank, Ronald E Unger, Pilar Martinez-Martinez
Targeted delivery of drugs across endothelial barriers remains a formidable challenge, especially in the case of the brain, where the blood-brain barrier severely limits entry of drugs into the central nervous system. Nanoparticle-mediated transport of peptide/protein-based drugs across endothelial barriers shows great potential as a therapeutic strategy in a wide variety of diseases. Functionalizing nanoparticles with peptides allows for more efficient targeting to specific organs. We have evaluated the hemocompatibilty, cytotoxicity, endothelial uptake, efficacy of delivery and safety of liposome, hyperbranched polyester, poly(glycidol) and acrylamide-based nanoparticles functionalized with peptides targeting brain endothelial receptors, in vitro and in vivo...
November 21, 2016: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/27799765/getting-into-the-brain-liposome-based-strategies-for-effective-drug-delivery-across-the-blood-brain-barrier
#2
REVIEW
Débora B Vieira, Lionel F Gamarra
This review summarizes articles that have been reported in literature on liposome-based strategies for effective drug delivery across the blood-brain barrier. Due to their unique physicochemical characteristics, liposomes have been widely investigated for their application in drug delivery and in vivo bioimaging for the treatment and/or diagnosis of neurological diseases, such as Alzheimer's, Parkinson's, stroke, and glioma. Several strategies have been used to deliver drug and/or imaging agents to the brain...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27797175/liposome-based-systemic-glioma-targeted-drug-delivery-enabled-by-all-d-peptides
#3
Man Ying, Changyou Zhan, Songli Wang, Bingxin Yao, Xuefeng Hu, Xianfei Song, Mingfei Zhang, Xiaoli Wei, Yan Xiong, Weiyue Lu
As the most aggressive brain tumor, chemotherapy of malignant glioma remains to be extremely challenging in clinic. The blood-brain barrier (BBB) and blood-brain tumor barrier (BBTB) are physiological and pathological barriers preventing therapeutic drugs from reaching the glioma region. In addition, vasculogenic mimicry (VM) formed by invasive glioma cells instead of endothelial cells and angiogenesis are very common in glioma, leading to the poor prognosis and recurrence of glioma. An ideal drug delivery system for glioma chemotherapy needs to traverse the BBB and BBTB and then target VM, angiogenesis, and glioma cells...
October 31, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27784243/brain-drug-delivery-systems-for-the-stroke-intervention-and-recovery
#4
Tiantian Luo, Ju Wang, Shilei Hao, Tingwang Guo, Peng Ren, Zhongjun Cheng, Feiyan Gao, Yuhua Gong, Bochu Wang
BACKGROUND: Stroke remains the second commonest cause of death and leading cause of adult disability worldwide. Ischemic events account for nearly 85% of all strokes, and hemorrhages account for nearly 15%. Stroke intervention and recovery have been identified as the important factors in the functional outcome of patients with completed stroke. However, the only FDA approved treatment for ischemic strokes is tissue plasminogen activator, and no effective targeted therapy for hemorrhagic stroke exists yet...
October 25, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27769888/retro-inverso-peptide-inhibitor-nanoparticles-as-potent-inhibitors-of-aggregation-of-the-alzheimer-s-a%C3%AE-peptide
#5
Maria Gregori, Mark Taylor, Elisa Salvati, Francesca Re, Simona Mancini, Claudia Balducci, Gianluigi Forloni, Vanessa Zambelli, Silvia Sesana, Maria Michael, Christos Michail, Claire Tinker-Mill, Oleg Kolosov, Michael Scherer, Stephen Harris, Nigel J Fullwood, Massimo Masserini, David Allsop
Aggregation of Amyloid-β peptide (Aβ) is a key event in the pathogenesis of Alzheimer's disease (AD). We investigated the effects of nanoliposomes decorated with the retro-inverso peptide RI-OR2-TAT (Ac-rGffvlkGrrrrqrrkkrGy-NH2) on the aggregation and toxicity of Aβ. Remarkably low concentrations of these peptide inhibitor nanoparticles (PINPs) were required to inhibit the formation of Aβ oligomers and fibrils in vitro, with 50% inhibition occurring at a molar ratio of ~1:2000 of liposome-bound RI-OR2-TAT to Aβ...
October 18, 2016: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/27702684/lipopeptide-based-micellar-and-liposomal-carriers-influence-of-surface-charge-and-particle-size-on-cellular-uptake-into-blood-brain-barrier-cells
#6
Karl Sydow, Heike Nikolenko, Dorothea Lorenz, Rainer H Müller, Margitta Dathe
Lipopeptide-based micelles and liposomes were found to differ in cell recognition and uptake mode into blood brain barrier (BBB) endothelial cells. Here we analyse the role of size and surface charge of micelles and liposomes composed of different lipopeptide sequences with respect to uptake into human brain capillary (HBMEC) and aortic (HAoEC) endothelial cells. Comparable to the dipalmitoylated apolipoprotein E-derived P2A2, lipopeptides of cationic poly-arginine (P2Rn), poly-lysine (P2Kn) and an anionic glutamic-acid sequence (P2En) self assemble into micelles (12-14nm in diameter) with high surface charge density, and bind to small (SUVs, about 24nm in diameter) and large (LUV, about 100nm in diameter) liposomes at variable lipid to peptide ratios...
December 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27700119/biomimetic-apoe-reconstituted-high-density-lipoprotein-nanocarrier-for-blood-brain-barrier-penetration-and-amyloid-beta-targeting-drug-delivery
#7
Qingxiang Song, Huahua Song, Jianrong Xu, Jialin Huang, Meng Hu, Xiao Gu, Juan Chen, Gang Zheng, Hongzhuan Chen, Xiaoling Gao
Amyloid beta (Aβ) and its aggregation forms in the brain have been suggested as key targets for the therapy of Alzheimer's disease (AD). Therefore, the development of nanocarriers which possess both blood-brain barrier permeability and Aβ-targeting ability is of great importance for the intervention of AD. Here we constructed a biomimetic nanocarrier named apolipoprotein E (ApoE)-reconstituted high density lipoprotein nanocarrier (ANC) from recombinant ApoE and synthetic lipids to achieve the above goals...
October 4, 2016: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/27644895/targeting-vincristine-plus-tetrandrine-liposomes-modified-with-dspe-peg2000-transferrin-in-treatment-of-brain-glioma
#8
Xiao-Li Song, Shuang Liu, Ying Jiang, Li-Yan Gu, Yao Xiao, Xin Wang, Lan Cheng, Xue-Tao Li
Glioma is the most frequent primary tumor, and the treatment efficiency is unsatisfactory for the obstacle of the blood brain barrier (BBB), the multidrug resistance (MDR) and the properties of cancer cell invasion and vasculogenic mimicry (VM) formation. In this study, a kind of TF modified vincristine plus tetrandrine liposomes was developed to overcome those limitations. In vitro results showed that TF modified vincristine plus tetrandrine liposomes with suitable physicochemical property could enhance the transport across the BBB, increase the cellular uptake, inhibit the MDR, and block the cancer cell invasion and VM channels...
September 16, 2016: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27616018/nanoliposome-containing-cyclosporin-a-reduced-neuroinflammation-responses-and-improved-neurological-activities-in-cerebral-ischemia-reperfusion-in-rat
#9
Alireza Partoazar, Sanaz Nasoohi, Sayed Mehdi Rezayat, Kambiz Gilani, Shahram Ejtemaei Mehr, Amir Amani, Nastaran Rahimi, Ahmad Reza Dehpour
Cyclosporin A (CsA) is known as a neuroprotective agent against cerebral ischemia/reperfusion (I/R) in animal models. However, the significant therapeutic effects of CsA have been observed in high systemic doses or manipulating the blood brain barrier (BBB), resulting in systemic side effects and toxicity. Since the liposome nanocarries have been developed for efficient delivery of peptide and proteins, liposomal CsA (Lipo-CsA) could improve cerebral (I/R) injuries. In this study, the liposomal CsA formulation (CsA at dose of 2...
September 12, 2016: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/27612797/investigating-the-passage-of-tetramethylpyrazine-loaded-liposomes-across-blood-brain-barrier-models-in-vitro-and-ex-vivo
#10
Hongmei Xia, Zhiqing Cheng, Yongfeng Cheng, Yinxiang Xu
Tetramethylpyrazine (TMP) is a natural product extracted from Rhizoma Chuanxiong. Liposomes are an excellent delivery method that is suitable for the penetration of the blood-brain barrier (BBB). TMP-loaded liposomes are suitable for the treatment of cerebral ischemic diseases. We measured the morphology, particle size, zeta-potential, entrapment efficiency, and content of TMP-loaded liposome. The electrochemical method was adopted to determine entrapment efficiency for the first time. In addition, their diffusion through BBB models, which were built not only by in vitro cell culture but also by the ex vivo mouse subcutaneous-mucous-membrane (mSMM) method, was explored...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27554805/therapeutic-strategies-for-alzheimer-s-and-parkinson-s-diseases-by-means-of-drug-delivery-systems
#11
REVIEW
S Cunha, M H Amaral, J M Sousa Lobo, A C Silva
Alzheimer's and Parkinson's diseases are prevalent neurodegenerative disorders worldwide, which are essentially related to aging. Within the remarkable era of nanomedicine, nowadays several delivery systems have been suggested to improve the treatment of these disorders, namely, liposomes, micelles, nanoparticles (polymeric, lipid, metallic and inorganic), exosomes, dendrimers and fullerenes. The advantage that has been claimed to these delivery systems is that they facilitate the passage of drugs through the blood brain barrier (BBB), enabling targeting before body degradation, and increasing therapeutic efficacy, comparied to conventional pharmaceutical dosage forms...
2016: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/27553779/delivery-of-copper-chelating-trientine-teta-to-the-central-nervous-system-by-surface-modified-liposomes
#12
Robin Tremmel, Philipp Uhl, Frieder Helm, Dominik Wupperfeld, Max Sauter, Walter Mier, Wolfgang Stremmel, Götz Hofhaus, Gert Fricker
The existence of the blood-brain barrier (BBB) complicates the treatment of many central nervous system (CNS) disorders, including the copper storage disease, Wilson's disease. Its CNS symptoms represent a serious problem, since therapeutics for Wilson's disease do not cross the BBB. One strategy to overcome this obstacle is the transfer of drugs across the BBB with colloidal carrier systems like liposomes. The aim of the present study was to encapsulate triethylenetetramine (TETA), a copper chelating agent, into surface modified liposomes and to investigate their permeation across the BBB...
October 15, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27501362/delivery-of-therapeutic-sirna-to-the-cns-using-cationic-and-anionic-liposomes
#13
Heather R Bender, Sarah Kane, Mark D Zabel
Prion diseases result from the misfolding of the normal, cellular prion protein (PrP(C)) to an abnormal protease resistant isomer called PrP(Res). The emergence of prion diseases in wildlife populations and their increasing threat to human health has led to increased efforts to find a treatment for these diseases. Recent studies have found numerous anti-prion compounds that can either inhibit the infectious PrP(Res) isomer or down regulate the normal cellular prion protein. However, most of these compounds do not cross the blood brain barrier to effectively inhibit PrP(Res) formation in brain tissue, do not specifically target neuronal PrP(C), and are often too toxic to use in animal or human subjects...
2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27498281/double-targeted-polymersomes-and-liposomes-for-multiple-barrier-crossing
#14
M Sánchez-Purrà, V Ramos, V A Petrenko, V P Torchilin, S Borrós
In order to treat metastasis in the brain, drug delivery systems must overcome multiple physical barriers between the point of administration and the target, such as the Blood-brain barrier, that hinder their free access across them. Multiple targeting approaches arise as a promising alternative to this barrier and target certain tissues inside the brain at a time. Herein, two surface modification methods are presented to obtain dual-targeted vesicle-like carriers functionalized with an MCF-7-specific phage protein and a BBB-specific peptide, providing the system the ability to cross a BBB model, target breast cancer cells and deliver its payload...
September 25, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27477722/nano-theranostics-and-nitroxyl-radical-labeled-antitumor-agents-for-magnetic-resonance-imaging
#15
Ichio Aoki
The advent of functional contrast agents and nanoparticle drug delivery systems (nano-DDS) is opening new pathways to understanding pathophysiology using magnetic resonance imaging (MRI). Nitroxyl radical compounds are promising functional contrast agents for redox evaluation. We have developed a novel nitroxyl radical theranostic compound for noninvasive real-time imaging of blood-brain barrier-permeable antitumor drugs. Divalent manganese ions (Mn(2+)) can also be used as an intracellular functional MRI contrast agent...
2016: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/27446492/label-free-cest-mri-detection-of-citicoline-liposome-drug-delivery-in-ischemic-stroke
#16
Huanling Liu, Anna Jablonska, Yuguo Li, Suyi Cao, Dexiang Liu, Hanwei Chen, Peter Cm Van Zijl, Jeff W M Bulte, Miroslaw Janowski, Piotr Walczak, Guanshu Liu
ABSTRACT Citicoline (CDPC) is a natural supplement with well-documented neuroprotective effects in the treatment of neurodegenerative diseases. In the present study, we sought to exploit citicoline as a theranostic agent with its inherent chemical exchange saturation transfer (CEST) MRI signal, which can be directly used as an MRI guidance in the citicoline drug delivery. Our in vitro CEST MRI results showed citicoline has two inherent CEST signals at +1 and +2 ppm, attributed to exchangeable hydroxyl and amine protons, respectively...
2016: Theranostics
https://www.readbyqxmd.com/read/27418824/charge-effect-of-a-liposomal-delivery-system-encapsulating-simvastatin-to-treat-experimental-ischemic-stroke-in-rats
#17
Mireia Campos-Martorell, Mary Cano-Sarabia, Alba Simats, Mar Hernández-Guillamon, Anna Rosell, Daniel Maspoch, Joan Montaner
BACKGROUND AND AIMS: Although the beneficial effects of statins on stroke have been widely demonstrated both in experimental studies and in clinical trials, the aim of this study is to prepare and characterize a new liposomal delivery system that encapsulates simvastatin to improve its delivery into the brain. MATERIALS AND METHODS: In order to select the optimal liposome lipid composition with the highest capacity to reach the brain, male Wistar rats were submitted to sham or transitory middle cerebral arterial occlusion (MCAOt) surgery and treated (intravenous [IV]) with fluorescent-labeled liposomes with different net surface charges...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27379232/biomaterials-for-the-treatment-of-alzheimer-s-disease
#18
REVIEW
Darya Hadavi, André A Poot
Alzheimer's disease (AD) as a progressive and fatal neurodegenerative disease represents a huge unmet need for treatment. The low efficacy of current treatment methods is not only due to low drug potency but also due to the presence of various obstacles in the delivery routes. One of the main barriers is the blood-brain barrier. The increasing prevalence of AD and the low efficacy of current therapies have increased the amount of research on unraveling of disease pathways and development of treatment strategies...
2016: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/27374198/brain-tumor-targeted-therapy-by-systemic-delivery-of-sirna-with-transferrin-receptor-mediated-core-shell-nanoparticles
#19
Lin Wei, Xi-Ying Guo, Ting Yang, Min-Zhi Yu, Da-Wei Chen, Jian-Cheng Wang
Treatment of brain tumor remains a great challenge worldwide. Development of a stable, safe, and effective siRNA delivery system which is able to cross the impermeable blood-brain barrier (BBB) and target glioma cells is necessary. This study aims to investigate the therapeutic effects of intravenous administration of T7 peptide modified core-shell nanoparticles (named T7-LPC/siRNA NPs) on brain tumors. Layer-by-layer assembling of protamine/chondroitin sulfate/siRNA/cationic liposomes followed by T7 peptide modification has been carried out in order to obtain a targeted siRNA delivery system...
August 20, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27350533/use-of-pegylated-immunoliposomes-to-deliver-dopamine-across-the-blood-brain-barrier-in-a-rat-model-of-parkinson-s-disease
#20
Young-Sook Kang, Hyun-Joo Jung, Ji-Suk Oh, Dae-Yong Song
AIM: To treat neurodegenerative disorders such as Parkinson's disease (PD), drugs must be able to cross the blood-brain barrier (BBB). Patients with PD are deficient in dopamine (DA), a neurotransmitter that cannot pass through the BBB. Liposomes modified by adding polyethylene glycol (PEGylated liposomes (PLs)) can be conjugated with antibody to form DA-PEGylated immunoliposomes (DA-PILs), and we tested their use as carriers of DA for treating PD. METHODS: PEGylated liposomes (PLs) were prepared by evaporation method, and [(3) H]dopamine was encapsulated within the dried lipid film using a freeze/thaw cycle to form DA-PL...
October 2016: CNS Neuroscience & Therapeutics
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