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https://www.readbyqxmd.com/read/28274315/-vegf-overespression-promotes-the-proliferation-and-differentiation-of-human-adipose-derived-stem-cells
#1
Youbai Chen, Qixu Zhang, E Butler Charles, Yewen Wu, Liping Zhang, Jiangling Dong, Yan Han
Objective To investigate the effect of vascular endothelial growth factor (VEGF) overexpression on the phenotype, proliferation and multilineage differentiation ability of human adipose-derived stem cells (hADSCs). Methods Passage-2 hADSCs were transfected with pIRES2-EGFP-VEGF plasmid using DOTAP liposomal technique, whereas hADSCs in control group were transfected in absence of plasmid. The success of transfection was confirmed by immunofluorescent cytochemistry. Phenotype differences between the two groups were detected using flow cytometry...
March 2017: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/28243087/cationic-liposomes-promote-antigen-cross-presentation-in-dendritic-cells-by-alkalizing-the-lysosomal-ph-and-limiting-the-degradation-of-antigens
#2
Jie Gao, Lukasz J Ochyl, Ellen Yang, James J Moon
Cationic liposomes (CLs) have been widely examined as vaccine delivery nanoparticles since they can form complexes with biomacromolecules, promote delivery of antigens and adjuvant molecules to antigen-presenting cells (APCs), and mediate cellular uptake of vaccine components. CLs are also known to trigger antigen cross-presentation - the process by which APCs internalize extracellular protein antigens, degrade them into minimal CD8(+) T-cell epitopes, and present them in the context of major histocompatibility complex-I (MHC-I)...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28239294/transfection-studies-with-colloidal-systems-containing-highly-purified-bipolar-tetraether-lipids-from-sulfolobus-acidocaldarius
#3
Konrad H Engelhardt, Shashank Reddy Pinnapireddy, Elias Baghdan, Jarmila Jedelská, Udo Bakowsky
Lipid vectors are commonly used to facilitate the transfer of nucleic acids into mammalian cells. In this study, two fractions of tetraether lipids from the archaea Sulfolobus acidocaldarius were extracted and purified using different methods. The purified lipid fractions polar lipid fraction E (PLFE) and hydrolysed glycerol-dialkyl-nonitol tetraether (hGDNT) differ in their structures, charge, size, and miscibility from conventional lipids. Liposomes were prepared by mixing tetraether lipids with cholesterol (CH) and 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP) resulting in stable vectors for gene delivery...
2017: Archaea: An International Microbiological Journal
https://www.readbyqxmd.com/read/28223236/effect-of-hyaluronic-acid-binding-to-lipoplexes-on-intravitreal-drug-delivery-for-retinal-gene-therapy
#4
Thomas F Martens, Karen Peynshaert, Thaís Leite Nascimento, Elias Fattal, Marcus Karlstetter, Thomas Langmann, Serge Picaud, Jo Demeester, Stefaan C De Smedt, Katrien Remaut, Kevin Braeckmans
Intravitreal administration of nanomedicines could be valuable for retinal gene therapy, if their mobility in the vitreous and therapeutic efficacy in the target cells can be guaranteed. Hyaluronic acid (HA) as an electrostatic coating of polymeric gene nanomedicines has proven to be beneficial on both accounts. While electrostatic coating provides an easy way of coating cationic nanoparticles, the stability of electrostatic complexes in vivo is uncertain. In this study, therefore, we compare electrostatic with covalent coating of gene nanocarriers with HA for retinal gene therapy via intravitreal administration...
February 20, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28197373/systemic-activation-of-antigen-presenting-cells-via-rna-loaded-nanoparticles
#5
Elias J Sayour, Gabriel De Leon, Christina Pham, Adam Grippin, Hanna Kemeny, Joshua Chua, Jianping Huang, John H Sampson, Luis Sanchez-Perez, Catherine Flores, Duane A Mitchell
While RNA-pulsed dendritic cell (DC) vaccines have shown promise, the advancement of cellular therapeutics is fraught with developmental challenges. To circumvent the challenges of cellular immunotherapeutics, we developed clinically translatable nanoliposomes that can be combined with tumor-derived RNA to generate personalized tumor RNA-nanoparticles (NPs) with considerable scale-up capacity. RNA-NPs bypass MHC restriction, are amenable to central distribution, and can provide near immediate immune induction...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28131717/aptamer-functionalized-hybrid-nanoparticle-for-the-treatment-of-breast-cancer
#6
David Powell, Sruti Chandra, Kyra Dodson, Farhana Shaheen, Kylar Wilt, Shubha Ireland, Muniruzzaman Syed, Srikanta Dash, Thomas Wiese, Tarun Mandal, Anup Kundu
PURPOSE: Resistance to chemotherapeutic agents such as doxorubicin is a major reason for cancer treatment failure. At present the treatment option for metastatic breast cancer is very poor. Therefore, development of an effective therapeutic strategy to circumvent MDR of metastatic breast cancer is highly anticipated. The MDR of metastatic breast cancer cells was accompanied with the overexpression of P-gp transporter. Even though the overexpression of P-gp could be minimized by silencing with siRNA, the question is how they can be selectively targeted to the cancer cells...
January 25, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28126014/attachment-of-class-b-cpg-odn-onto-dotap-dc-chol-liposome-in-nasal-vaccine-formulations-augments-antigen-specific-immune-responses-in-mice
#7
Rui Tada, Shoko Muto, Tomoko Iwata, Akira Hidaka, Hiroshi Kiyono, Jun Kunisawa, Yukihiko Aramaki
BACKGROUND: To overcome infectious diseases, the development of mucosal vaccines would be an effective strategy, since mucosal surfaces are the entry site for most pathogens. In general, protein antigens show inherently poor immunogenicity when administered by the mucosal route. Therefore, co-administration of an appropriate mucosal adjuvant is required to exert immune responses toward pathogen-derived antigens effectively. However, the development of a safe and effective mucosal adjuvant system is still challenging...
January 26, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28112858/cooperative-strategies-for-enhancing-performance-of-photothermal-therapy-ptt-agent-optimizing-its-photothermal-conversion-and-cell-internalization-ability
#8
Baoji Du, Chongbo Ma, Guanyu Ding, Xu Han, Dan Li, Erkang Wang, Jin Wang
Photothermal conversion ability (PCA) and cell internalization ability (CIA) are two key factors for determining the performance of photothermal agents. The previous studies mostly focus on improving the PCA by exploring new photothermal nanomaterials. Herein, the authors take the hybrids of graphene and gold nanostar (GGN) as an example to investigate the gradually enhanced phototherapy effect by changing the PCA and CIA of photothermal therapy (PTT) agent simultaneously. Based on the GGN, the GGN and the reduced GGN protected by bovine serum albumin (BSA) or BSA-FA (folic acid) are prepared, which are named as GGNB, rGGNB, and rGGNB-FA, respectively...
January 23, 2017: Small
https://www.readbyqxmd.com/read/28035828/a-hepatic-carcinoma-selective-nucleic-acid-nanovector-assembled-by-endogenous-molecules-based-on-modular-strategy
#9
Fang Xie, Luchen Zhang, Jinliang Peng, Chong Li, Jun Pu, Yuhong Xu, Zixiu Du
We rationally formulated a nucleic acid nano-vector platform utilizing endogenous molecules in the following steps: nucleic acids are initially packed by a multifunctional peptide and a cationic liposome to form positively charged ternary complexes through electrostatic interaction; then the ternary complexes were coated with hyaluronic acid (HA) to form negatively charged quaternary nanocomplexes (Q-complexes). Among the components of Q-complexes, the multifunctional peptide was composed of a polysixteen-arginine (R16) and a hepatic tumor-targeted cell penetrating peptide (KRPTMRFRYTWNPMK); the cationic lipid component included DOTAP and fusogenic lipid DOPE; the HA component shielded the cationic ternary complexes and actively targeted the CD44 overexpressed on the surface of tumor cells...
December 30, 2016: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/27934088/biomimetic-light-harvesting-antenna-based-on-the-self-assembly-of-conjugated-polyelectrolytes-embedded-within-lipid-membranes
#10
Christina F Calver, Kirk S Schanze, Gonzalo Cosa
Here we report a biomimetic light-harvesting antenna based on negatively charged poly(phenylene ethynylene) conjugated polyelectrolytes assembled within a positively charged lipid membrane scaffold constructed by the lipid 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP). Light harvested by the polymers was transferred via through-space mechanisms to a lipophilic energy acceptor (the cyanine dye DiI) whose effective molar absorption was enhanced by up to 18-fold due to the antenna effect. Absorption amplification of DiI was found to be due primarily to direct energy transfer from polymers...
November 22, 2016: ACS Nano
https://www.readbyqxmd.com/read/27912212/knockdown-of-inhibitory-guanine-nucleotide-binding-protein-gi%C3%AE-2-by-antisense-oligodeoxynucleotides-attenuates-the-development-of-hypertension-and-tachycardia-in-spontaneously-hypertensive-rats
#11
Yousra Ali El-Basyuni, Yuan Li, Madhu B Anand-Srivastava
BACKGROUND: We previously showed that the levels of both Giα-2 and Giα-3 proteins were augmented in spontaneously hypertensive rats (SHRs) before the onset of hypertension. In addition, intraperitoneal injection of pertussis toxin, which inactivates both Giα proteins, prevented the development of hypertension in SHRs. The aim of the present study was to determine the specific contributions of Giα-2 and Giα-3 proteins to the development of hypertension. METHODS AND RESULTS: Antisense oligodeoxynucleotide of Giα-2 and Giα-3 encapsulated in PEG/DOTAP/DOPE cationic liposomes were administrated intravenously into 3-week-old prehypertensive SHRs and Wistar Kyoto rats, whereas the control Wistar Kyoto rats and SHRs received PBS, empty liposomes, or sense...
October 26, 2016: Journal of the American Heart Association
https://www.readbyqxmd.com/read/27896589/lipid-nanoparticles-loaded-with-an-antisense-oligonucleotide-gapmer-against-bcl-2-for-treatment-of-lung-cancer
#12
Xinwei Cheng, Qibing Liu, Hong Li, Chen Kang, Yang Liu, Tianqi Guo, Ke Shang, Chengyun Yan, Guang Cheng, Robert J Lee
PURPOSE: Bcl-2 is an anti-apoptotic gene that is frequently overexpressed in human cancers. G3139 is an antisense oligonucleotide against bcl-2 that has shown limited efficacy in clinical trials. Here, we report the synthesis of a new antisense oligonucleotide containing additional chemical modifications and its delivery using nanoparticles. METHODS: An oligonucleotide G3139-GAP was synthesized, which has 2'-O-methyl nucleotides at the 5' and 3' ends based on a "gapmer" design...
November 28, 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27702492/hyaluronic-acid-conjugated-micelles-possessing-cd44-targeting-potential-for-gene-delivery
#13
Wen Jen Lin, Wei-Chi Lee, Ming-Jium Shieh
The high- and low-molecular weight hyaluronic acid (HHA and LHA) were used to conjugate with PLGA-PEG copolymers which were applied to encapsulate DOTAP/pDNA (D/P) lipoplex as a CD44-targeted micelle delivery system. The size and zeta potential of DNA loaded micelles were measured. The cytotoxicity and cellular transfection of DNA loaded micelles were performed in CD44-positive MDA-MB-231 and MCF-7 cancer cells and CD44-negative HepG2 cells. The endocytosis mechanism of micelles was investigated further. The DNA loaded HA-conjugated micelles possessed negative-charged character which prevented erythrocytes from agglutination...
January 2, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27694054/the-biological-activity-of-cationic-liposomes-in-drug-delivery-and-toxicity-test-in-animal-models
#14
Panpan Qi, Mei Cao, Liju Song, Chong Chen, Mingdong Liu, Ningzhe Li, Daoyan Wu, Jingshan Peng, Guoku Hu, Jian Zhao
In the study we made use of DOTAP (1,2-dioleoyl-3-trimethylammonium), DOPE (1,2-dioleoyl-snglycero-3-phosphoethanolamine) and PEG-PE (polyethylene glycol- polyethylene) to make cationic PEG-liposomes by ultrasonic dispersion method. The plasmid pGPU6 combined with cationic PEG-liposomes or Liopofectamin 2000 was used to transfect PC3 cells to judge the transfection efficiency. HE staining showed that the pGUP6-shAurora B plasmid/liposomes complex could significantly inhibit tumor growth in mice tumor model...
October 2016: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/27631392/exploring-the-hydration-method-for-loading-sirna-on-liposomes-the-interplay-between-stability-and-biological-activity-in-human-undiluted-ascites-fluid
#15
George R Dakwar, Kevin Braeckmans, Wim Ceelen, Stefaan C De Smedt, Katrien Remaut
Delivery of small interfering RNA (siRNA) is recently gaining tremendous attention for the treatment of ovarian cancer. The present study investigated the potential of different liposomal formulations composed of (2,3-dioleoyloxy-propyl)-trimethylammonium (DOTAP) and 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE) encapsulating siRNA (hydration method) for their ability to knockdown luciferase (Luc) activity in human ovarian cancer SKOV-3 cells. Fluorescence single particle tracking (fSPT) and fluorescence correlation spectroscopy (FCS) in human-undiluted ascites fluid obtained from a peritoneal carcinomatosis patient revealed that cationic hydra-lipoplexes (HYDRA-LPXs) and HYDRA-LPXs decorated with stable DSPE-PEG (DSPE HYDRA-LPXs) showed high stability during at least 24 h...
April 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/27600702/co-localization-of-fluorescent-labeled-lipid-nanoparticles-with-specifically-tagged-subcellular-compartments-by-single-particle-tracking-at-low-nanoparticle-to-cell-ratios
#16
Matthew Tiffany, Francis C Szoka
We utilized quantitative high-resolution single particle tracking to study the internalization and endosomal sorting of lipid nanoparticles (LNPs) by HeLa cells in vitro to gain a better understanding of how cells process LNPs that are used for siRNA delivery. We compared the trafficking of three formulations that have been demonstrated to deliver siRNA into cells. They were composed of either a tritratable anionic lipid, formulation of cholesterol hemisuccinate (CHEMS), or a titratatable cationic lipid formulation of 1,2-dilinoleyloxy-3-dimethylaminopropane (DLinDMA) or a non-titratable cationic formulation lipid formulation of 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP)...
November 2016: Journal of Drug Targeting
https://www.readbyqxmd.com/read/27593989/pegylation-of-lipoplexes-the-right-balance-between-cytotoxicity-and-sirna-effectiveness
#17
Anna Lechanteur, Tania Furst, Brigitte Evrard, Philippe Delvenne, Pascale Hubert, Géraldine Piel
The delivery of small interfering RNA (siRNA) is an attractive therapeutic approach to treat several pathologies, such as viral infections or cancers. However, the stability and the efficacy of these biotherapies are still a major obstacle to their use. Cationic liposomes (DOTAP/Chol/DOPE 1/0.75/0.5M ratio) have been complexed to siRNA (lipoplexes) in order to be administrated by the vaginal route, in the context of HPV16 induced cervical preneoplastic lesions. To overcome the constraint of the cervico-vaginal mucus, PEGylation is required to allow the diffusion of lipoplexes through it...
October 10, 2016: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27585903/endocytic-transport-of-polyplex-and-lipoplex-sirna-vectors-in-hela-cells
#18
Mihael Lazebnik, Rahul K Keswani, Daniel W Pack
PURPOSE: siRNA may be delivered as electrostatic complexes with cationic lipids (lipoplexes) or polycations (polyplexes). The purpose of this project was to determine the effect of cellular internalization mechanism(s) on siRNA-mediated gene silencing efficiency. METHODS: Lipoplexes were formed comprising siRNA and N-[1-(2,3-dioleoyloxy)propyl]-N,N,N-trimethylammonium methyl-sulfate (DOTAP), cholesterol and dioleoyl phosphatidylethanolamine (DOPE), and polyplexes comprised siRNA with polyethylenimine (PEI)...
September 1, 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27476941/cargo-free-nanoparticles-containing-cationic-lipids-induce-reactive-oxygen-species-and-cell-death-in-hepg2-cells
#19
Chul-Ho Yun, Chun-Sik Bae, Taeho Ahn
Nanoparticles (NPs) containing cationic monovalent lipids such as 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP) and N-(1-[2,3-dioleyloxy]propyl)-N,N,N-trimethylammonium chloride (DOTMA), have been widely used for the delivery of nucleic acid such as small-interfering RNA and polypeptide to cells as cancer therapies and vaccine development. Several previous reports have suggested that cationic liposomes induce reactive oxygen species (ROS) and ROS-mediated toxicity in cells. Here, we systematically investigated the effects of DOTAP- or DOTMA-containing NPs without any cargo on the human carcinoma cells, HepG2...
2016: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27436311/lipoplexes-from-non-viral-cationic-vectors-dotap-dope-liposomes-and-gemini-micelles
#20
Sara Falsini, Sandra Ristori
This chapter describes the topic of gene therapy based on colloidal drug delivery, as an alternative to the use of viral carriers. Non-viral vectors are promising transfection agents and do not suffer from limitations related to toxicity and immunogenic effects. In particular, lipid-based aggregates are generally considered biocompatible and versatile nanocarriers whose composition can be designed to include a cationic molecule which ensures strong interaction with nucleic acid. Herein the main issues related to complex formation and in vitro administration are illustrated with key examples, such as liposome-DNA plasmid (pDNA) association and micelles-siRNA complexes...
2016: Methods in Molecular Biology
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