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Cationic lipid

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https://www.readbyqxmd.com/read/29028315/nanoparticles-of-short-cationic-peptidopolysaccharide-self-assembled-by-hydrogen-bonding-with-antibacterial-effect-against-multi-drug-resistant-bacteria
#1
Zheng Hou, Yogesh Vikhe Shankar, Yang Liu, Feiqing Ding, Jothy Lachumy Subramanion, Vikashini Ravikumar, Rubí Zamudio-Vázquez, Damien Keogh, Huiwen Lim, Moon Yue Feng Tay, Surajit Bhattacharjya, Scott A Rice, Jian Shi, Hongwei Duan, Xue-Wei Liu, Yuguang Mu, Nguan Soon Tan, Kam Michael Chiu Tam, Kevin Pethe, Mary B Chan-Park
Cationic antimicrobial peptides (AMPs) and polymers are active against many multi-drug resistant (MDR) bacteria but only a limited number of these compounds are in clinical use due to their unselective toxicity. The typical strategy for achieving selective antibacterial efficacy with low mammalian cell toxicity is through balancing the ratio of cationicity to hydrophobicity. Herein, we report a cationic nanoparticle self-assembled from chitosan-graft-oligolysine (CSM5-K5) chains with ultra-low molecular weight (1450 Daltons) that selectively kills bacteria...
October 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29023168/development-and-characterization-of-cationic-solid-lipid-nanoparticles-for-co-delivery-of-pemetrexed-and-mir-21-antisense-oligonucleotide-to-glioblastoma-cells
#2
Berrin Küçüktürkmen, Asuman Bozkır
The practical use of solid lipid nanoparticles (SLNs) in research has been highlighted in the literature, but few reports have combined SLNs with miRNA-based therapy and chemotherapy. We aimed to prepare cationic SLNs (cSLNs) to load anti-miR-21 oligonucleotide and pemetrexed for glioblastoma therapy in vitro. cSLNs were employed to encapsulate both pemetrexed and anti-miR-21 by a high pressure homogenization method, and then the properties of cSLNs were characterized. We studied cellular uptake and cytotoxicity properties of cSLNs in U87MG cells...
October 12, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29021491/effects-of-sterol-like-additives-on-phase-transition-behavior-of-ion-pair-amphiphile-bilayers
#3
Wei-Han Chang, Yun-Ting Chuang, Cheng-Yeh Yu, Chien-Hsiang Chang, Yu-Min Yang
The incorporation of additive in lipid bilayers is one of the ordinary approaches for modulating their properties. Additive effect on phase transition of ion-pair amphiphile (IPA) bilayers, however, is not known. In this work, four double-chained IPAs with different hydrocarbon chain lengths and symmetry were designed and synthesized from single-chained cationic and anionic surfactants by the precipitation method. By using differential scanning calorimetry (DSC), the thermotropic transition behavior from gel phase (Lβ) through rippled phase (Pβ') if any to liquid-crystalline phase (Lα) was studied for bilayers of these lipid-like IPAs in excess water...
October 11, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/29020107/diacetylenic-lipids-in-the-design-of-stable-lipopolymers-able-to-complex-and-protect-plasmid-dna
#4
C Facundo Temprana, M Jimena Prieto, Daniela E Igartúa, A Lis Femia, M Silvia Amor, Silvia Del Valle Alonso
Different viral and non-viral vectors have been designed to allow the delivery of nucleic acids in gene therapy. In general, non-viral vectors have been associated with increased safety for in vivo use; however, issues regarding their efficacy, toxicity and stability continue to drive further research. Thus, the aim of this study was to evaluate the potential use of the polymerizable diacetylenic lipid 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine (DC8,9PC) as a strategy to formulate stable cationic lipopolymers in the delivery and protection of plasmid DNA...
2017: PloS One
https://www.readbyqxmd.com/read/29019911/the-effects-of-alkyl-chain-combinations-on-the-structural-and-mechanical-properties-of-biomimetic-ion-pair-amphiphile-bilayers
#5
Cheng-Hao Chen, Ching-An Tian, Chi-Cheng Chiu
Ion pair amphiphile (IPA), a lipid-like complex composed of a pair of cationic and anionic surfactants, has great potentials in various pharmaceutical applications. In this work, we utilized molecular dynamics (MD) simulation to systematically examine the structural and mechanical properties of the biomimetic bilayers consist of alkyltrimethyl-ammonium-alkylsulfate (CmTMA⁺-CnS(-)) IPAs with various alkyl chain combinations. Our simulations show an intrinsic one-atom offset for the CmTMA⁺ and CnS(-) alignment, leading to the asymmetric index definition of ΔC = m - (n + 1)...
October 11, 2017: Bioengineering
https://www.readbyqxmd.com/read/29018449/mechanisms-cofactors-and-augmenting-factors-involved-in-anaphylaxis
#6
REVIEW
Rosa Muñoz-Cano, Mariona Pascal, Giovanna Araujo, M J Goikoetxea, Antonio L Valero, Cesar Picado, Joan Bartra
Anaphylaxis is an acute and life-threatening systemic reaction. Many triggers have been described, including food, drug, and hymenoptera allergens, which are the most frequently involved. The mechanisms described in anaphylactic reactions are complex and implicate a diversity of pathways. Some of these mechanisms may be key to the development of the anaphylactic reaction, while others may only modify its severity. Although specific IgE, mast cells, and basophils are considered the principal players in anaphylaxis, alternative mechanisms have been proposed in non-IgE anaphylactic reactions...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28994235/lipo-protein-emulsion-structure-in-the-diet-affects-protein-digestion-kinetics-intestinal-mucosa-parameters-and-microbiota-composition
#7
Marion Oberli, Véronique Douard, Martin Beaumont, Daphné Jaoui, Fabienne Devime, Sandy Laurent, Catherine Chaumontet, Damien Mat, Steven Le Feunteun, Camille Michon, Anne-Marie Davila, Gilles Fromentin, Daniel Tomé, Isabelle Souchon, Marion Leclerc, Claire Gaudichon, François Blachier
SCOPE: Food structure is a key factor controlling digestion and nutrient absorption. We tested the hypothesis that protein emulsion structure in the diet may affect digestive and absorptive processes. METHODS & RESULTS: Rats (n = 40) were fed for 3 weeks two diets chemically identical but based on lipid-protein liquid-fine (LFE) or gelled-coarse (GCE) emulsions that differ at the macro- and micro-structure levels. After an overnight fasting, they ingested a (15) N-labeled LFE or GCE test meal and were euthanized 0, 15min, 1h and 5h later...
October 10, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28990784/cooperative-hydrogen-bond-dynamics-at-a-zwitterionic-lipid-water-interface-revealed-by-2d-hd-vsfg-spectroscopy
#8
Ken-Ichi Inoue, Prashant C Singh, Satoshi Nihonyanagi, Shoichi Yamaguchi, Tahei Tahara
Molecular-level elucidation of hydration at biological membrane interfaces is of great importance for understanding biological processes. We studied ultrafast hydrogen-bond dynamics at a zwitterionic phosphatidylcholine/water interface by two-dimensional heterodyne-detected vibrational sum frequency generation (2D HD-VSFG) spectroscopy. The obtained 2D spectra confirm that the anionic phosphate and cationic choline sites are individually hydrated at the interface. Furthermore, the data show that the dynamics of water at the zwitterionic lipid interface is not a simple sum of the dynamics of the water species that hydrate to the separate phosphate and choline...
October 9, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28989703/an-amphipathic-trans-acting-phosphorothioate-rna-element-delivers-an-uncharged-phosphorodiamidate-morpholino-sequence-in-mdx-mouse-myotubes
#9
H V Jain, J F Boehler, D Verthelyi, K Nagaraju, S L Beaucage
An efficient method for the delivery of uncharged polyA-tailed phosphorodiamidate morpholino sequences (PMO) in mammalian cells consists of employing a synthetic 8-mer amphipathic trans-acting poly-2'-O-methyluridylic thiophosphate triester element (2'-OMeUtaPS) as a transfection reagent. Unlike the dTtaPS DNA-based element, this RNA element is potent at delivering polyA-tailed PMO sequences to HeLa pLuc 705 cells or to myotube muscle cells. However, much like dTtaPS, the 2'-OMeUtaPS-mediated internalization of PMO sequences occurs through an energy-dependent mechanism; macropinocytosis appears to be the predominant endocytic pathway used for cellular uptake...
2017: RSC Advances
https://www.readbyqxmd.com/read/28986869/magnetofection%C3%A2-of-nmda-receptor-subunits-glun1-and-glun2a-expression-vectors-in-non-neuronal-host-cells
#10
Nadine Bruneau, Pierre Szepetowski
The functional study of reconstituted NMDA receptors (NMDARs) in host cells requires that the corresponding vectors for the expression of the NMDAR subunits are co-transfected with high efficiency. Magnetofection™ is a technology used to deliver nucleic acids to cells. It is driven and site-specifically guided by the attractive forces of magnetic fields acting on magnetic nanoparticles that are associated with nucleic acid vectors. In magnetofection™, cationic lipids form self-assembled complexes with the nucleic acid vectors of interest...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28976532/interfacial-and-structural-characteristics-of-polyelectrolyte-multilayers-used-as-cushions-for-supported-lipid-bilayers
#11
M Wlodek, M Kolasinska-Sojka, M Wasilewska, O Bikondoa, W H Briscoe, P Warszynski
The surface properties of polyelectrolyte multilayers (PEMs) obtained via sequential adsorption of oppositely charged polyions from their solutions and used as cushions for supported lipid bilayers were investigated. Five types of polyelectrolytes were used: cationic polyethyleneimine (PEI), poly(diallyldimethylammonium)chloride (PDADMAC), and poly-l-lysine hydrobromide (PLL); and anionic polysodium 4-styrenesulfonate (PSS) and poly-l-glutamic acid sodium (PGA). The wettability and surface free energy of the PEMs were determined by contact angle measurements using sessile drop analysis...
October 4, 2017: Soft Matter
https://www.readbyqxmd.com/read/28968121/co-spreading-of-anionic-phospholipids-with-peptides-of-the-structure-kx-4k-at-the-air-water-interface-influence-of-lipid-headgroup-structure-and-hydrophobicity-of-the-peptide-on-monolayer-behavior
#12
André Hädicke, Christian Schwieger, Alfred Blume
Mixtures of anionic phospholipids (PG, PA, PS, and CL) with cationic peptides were co-spread from a common organic solvent at the air-water interface. The compression of the mixed film was combined with epifluorescence microscopy or infrared reflection adsorption spectroscopy (IRRAS) to gain information on the interactions of the peptide with the different lipids. To evaluate the influence of the amino acid X of peptides with the sequence (KX)4K on the binding, 1,2-dipalmitoyl-sn-glycero-3-phosphoglycerol (DPPG) was mixed with different peptides with increasing hydrophobicity of the uncharged amino acid X...
October 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28965917/phospholipid-composition-of-packed-red-blood-cells-and-that-of-extracellular-vesicles-show-a-high-resemblance-and-stability-during-storage
#13
Eva Laurén, Feven Tigistu-Sahle, Sami Valkonen, Melissa Westberg, Anne Valkeajärvi, Juha Eronen, Pia Siljander, Ville Pettilä, Reijo Käkelä, Saara Laitinen, Erja Kerkelä
Red blood cells (RBCs) are stored up to 35-42days at 2-6°C in blood banks. During storage, the RBC membrane is challenged by energy depletion, decreasing pH, altered cation homeostasis, and oxidative stress, leading to several biochemical and morphological changes in RBCs and to shedding of extracellular vesicles (EVs) into the storage medium. These changes are collectively known as RBC storage lesions. EVs accumulate in stored RBC concentrates and are, thus, transfused into patients. The potency of EVs as bioactive effectors is largely acknowledged, and EVs in RBC concentrates are suspected to mediate some adverse effects of transfusion...
September 28, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28962904/simultaneous-membrane-interaction-of-amphipathic-peptide-monomers-self-aggregates-and-cargo-complexes-detected-by-fluorescence-correlation-spectroscopy
#14
Luís Vasconcelos, Tõnis Lehto, Fatemeh Madani, Vlad Radoi, Mattias Hällbrink, Vladana Vukojević, Ülo Langel
Peptides able to translocate cell membranes while carrying macromolecular cargo, as cell-penetrating peptides (CPPs), can contribute to the field of drug delivery by enabling the transport of otherwise membrane impermeable molecules. Formation of non-covalent complexes between amphipathic peptides and oligonucleotides is driven by electrostatic and hydrophobic interactions. Here we investigate and quantify the coexistence of distinct molecular species in multiple equilibria, namely peptide monomer, peptide self-aggregates and peptide/oligonucleotide complexes...
September 26, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28961003/membrane-order-is-a-key-regulator-of-divalent-cation-induced-clustering-of-pi-3-5-p2-and-pi-4-5-p2
#15
Maria J Sarmento, Ana Coutinho, Aleksander Fedorov, Manuel Prieto, Fábio Fernandes
Although the evidence for the presence of functionally important nanosized phosphorylated phosphoinositide (PIP)-rich domains within cellular membranes has accumulated, very limited information is available regarding the structural determinants for compartmentalization of these phospholipids. Here, we used a combination of fluorescence spectroscopy and microscopy techniques to characterize differences in divalent cation-induced clustering of PI(4,5)P2 and PI(3,5)P2. Through these methodologies we were able to detect differences in divalent cation-induced clustering efficiency and cluster size...
October 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28955768/vesicle-fusion-with-bilayer-lipid-membrane-controlled-by-electrostatic-interaction
#16
Azusa Oshima, Koji Sumitomo
The fusion of proteoliposomes is a promising approach for incorporating membrane proteins in artificial lipid membranes. In this study, we employed an electrostatic interaction between vesicles and supported bilayer lipid membranes (s-BLMs) to control the fusion process. We combined large unilamellar vesicles (LUVs) containing anionic lipids, which we used instead of proteoliposomes, and s-BLMs containing cationic lipids to control electrostatic interaction. Anionic LUVs were never adsorbed or ruptured on the SiO2 substrate with a slight negative charge, and selectively fused with cationic s-BLMs...
September 2017: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/28955328/co-delivery-of-dual-toll-like-receptor-agonists-and-antigen-in-poly-lactic-co-glycolic-acid-polyethylenimine-cationic-hybrid-nanoparticles-promote-efficient-in-vivo-immune-responses
#17
Mahboubeh Ebrahimian, Maryam Hashemi, Mohsen Maleki, Gholamreza Hashemitabar, Khalil Abnous, Mohammad Ramezani, Alireza Haghparast
Strategies to design delivery vehicles are critical in modern vaccine-adjuvant development. Nanoparticles (NPs) encapsulating antigen(s) and adjuvant(s) are promising vehicles to deliver antigen(s) and adjuvant(s) to antigen-presenting cells (APCs), allowing optimal immune responses against a specific pathogen. In this study, we developed a novel adjuvant delivery approach for induction of efficient in vivo immune responses. Polyethylenimine (PEI) was physically conjugated to poly(lactic-co-glycolic) acid (PLGA) to form PLGA/PEI NPs...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28953347/highly-potent-antibacterial-organometallic-peptide-conjugates
#18
Bauke Albada, Nils Metzler-Nolte
Resistance of pathogenic bacteria against currently marketed antibiotics is again increasing. To meet the societal need for effective cures, scientists are faced with the challenge of developing more potent but equally bacteria-specific drugs. Currently, most efforts are directed toward the modification of existing antibiotics, but ideally, compounds with a new mode of action are required. In this Account, we detail our findings in the area of novel metal-based antibiotics. Our strategy is based on the modification of simple antimicrobial peptides (AMPs) with organometallic agents, resulting in organometallic AMPs (OM-AMPs)...
September 27, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28949267/hansen-solubility-parameters-hsp-for-pre-screening-formulation-of-solid-lipid-nanoparticles-sln-in-vitro-testing-of-curcumin-loaded-sln-in-mcf-7-and-bt-474-cell-lines
#19
Doktorovova Slavomira, Eliana B Souto, Amélia M Silva
Curcumin, a phenolic compound from turmeric rhizome (Curcuma longa), has many interesting pharmacological effects, but shows very low aqueous solubility. Consequently, several drug delivery systems based on polymeric and lipid raw-materials have been proposed to increase its bioavailability. Solid lipid nanoparticles (SLN), consisting of solid lipid matrix and a surfactant layer can load poorly water-soluble drugs like curcumin, deliver them at defined rates and enhance their intracellular uptake. In the present work we demonstrate that, despite the drug's affinity to lipids frequently used in SLN production, the curcumin amount loaded in most SLN formulations may be too low to exhibit anticancer properties...
September 26, 2017: Pharmaceutical Development and Technology
https://www.readbyqxmd.com/read/28944659/t2-weighted-magnetic-resonance-imaging-of-hepatic-tumor-guided-by-spio-loaded-nanostructured-lipid-carriers-and-ferritin-reporter-genes
#20
Chen-Ying Lu, Jian-Song Ji, Xiu-Liang Zhu, Pei-Feng Tang, Qian Zhang, Nan-Nan Zhang, Zu-Hua Wang, Xiao-Juan Wang, Wei-Qian Chen, Jing-Bo Hu, Yong-Zhong Du, Ri-Sheng Yu
Nowadays, there is a high demand for supersensitive contrast agents for the early diagnostics of hepatocarcinoma. It has been recognized that accurate imaging information is able to be achieved by constructing hepatic tumor specific targeting probes, though it still faces challenges. Here, a AGKGTPSLETTP peptide (A54)-functionalized superparamagnetic iron oxide (SPIO)-loaded nanostructured lipid carrier (A54-SNLC), which can be specifically uptaken by hepatoma carcinoma cell (Bel-7402) and exhibited ultralow imaging signal intensity with varied Fe concentration on T2-weighted imaging (T2WI), was first prepared as an effective gene carrier...
October 4, 2017: ACS Applied Materials & Interfaces
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