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Cationic lipid

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https://www.readbyqxmd.com/read/28539583/transient-receptor-potential-canonical-5-channels-plays-an-essential-role-in-hepatic-dyslipidemia-associated-with-cholestasis
#1
Khadija M Alawi, David Tandio, Jin Xu, Pratish Thakore, Georgia Papacleovoulou, Elizabeth S Fernandes, Cristina Legido-Quigley, Catherine Williamson, Susan D Brain
Transient receptor potential canonical 5 (TRPC5), a calcium-permeable, non-selective cation channel is expressed in the periphery, but there is limited knowledge of its regulatory roles in vivo. Endogenous modulators of TRPC5 include a range of phospholipids that have an established role in liver disease, including lysophosphatidylcholine (LPC). Cholestasis is characterized by impairment of excretion of bile acids, leading to elevation of hepatic bile acids. We investigated the contribution of TRPC5 in a murine model of cholestasis...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28538154/effect-of-ca-2-to-sphingomyelin-investigated-by-sum-frequency-generation-vibrational-spectroscopy
#2
Rong-Juan Feng, Lu Lin, Yi-Yi Li, Ming-Hua Liu, Yuan Guo, Zhen Zhang
The interactions between Ca(2+) ions and sphingomyelin play crucial roles in a wide range of cellular activities. However, little is known about the molecular details of the interactions at interfaces. In this work, we investigated the interactions between Ca(2+) ions and egg sphingomyelin (ESM) Langmuir monolayers at the air/water interface by subwavenumber high-resolution broadband sum frequency generation vibrational spectroscopy (HR-BB-SFG-VS). We show that Ca(2+) ions can induce ordering of the acyl chains in the ESM monolayer...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28532079/nerve-growth-factor-loaded-heparinized-cationic-solid-lipid-nanoparticles-for-regulating-membrane-charge-of-induced-pluripotent-stem-cells-during-differentiation
#3
Yung-Chih Kuo, Rajendiran Rajesh
Nerve growth factor (NGF)-loaded heparinized cationic solid lipid nanoparticles (NGF-loaded HCSLNs) were developed using heparin-stearic acid conjugate, cacao butter, cholesterol, stearylamine (SA), and esterquat 1 (EQ 1). The effect of cationic lipids and lipid matrix composition on the particle size, particle structure, surface molecular composition, chemical structure, electrophoretic mobility, and zeta potential of HCSLNs was investigated. The effect of HCSLNs on the membrane charge of induced pluripotent stem cells (iPSCs) was also studied...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531236/psychosine-enhances-the-shedding-of-membrane-microvesicles-implications-in-demyelination-in-krabbe-s-disease
#4
Ludovic D'Auria, Cory Reiter, Emma Ward, Ana Lis Moyano, Michael S Marshall, Duc Nguyen, Giuseppe Scesa, Zane Hauck, Richard van Breemen, Maria I Givogri, Ernesto R Bongarzone
In prior studies, our laboratory showed that psychosine accumulates and disrupts lipid rafts in brain membranes of Krabbe's disease. A model of lipid raft disruption helped explaining psychosine's effects on several signaling pathways important for oligodendrocyte survival and differentiation but provided more limited insight in how this sphingolipid caused demyelination. Here, we have studied how this cationic inverted coned lipid affects the fluidity, stability and structure of myelin and plasma membranes...
2017: PloS One
https://www.readbyqxmd.com/read/28528666/role-of-nonneuronal-trpv4-signaling-in-inflammatory-processes
#5
Pradeep Rajasekhar, Daniel P Poole, Nicholas A Veldhuis
Transient receptor potential (TRP) ion channels are important signaling components in nociceptive and inflammatory pathways. This is attributed to their ability to function as polymodal sensors of environmental stimuli (chemical and mechanical) and as effector molecules in receptor signaling pathways. TRP vanilloid 4 (TRPV4) is a nonselective cation channel that is activated by multiple endogenous stimuli including shear stress, membrane stretch, and arachidonic acid metabolites. TRPV4 contributes to many important physiological processes and dysregulation of its activity is associated with chronic conditions of metabolism, inflammation, peripheral neuropathies, musculoskeletal development, and cardiovascular regulation...
2017: Advances in Pharmacology
https://www.readbyqxmd.com/read/28524089/green-synthesized-zinc-oxide-zno-nanoparticles-induce-oxidative-stress-and-dna-damage-in-lathyrus-sativus-l-root-bioassay-system
#6
Kamal K Panda, Dambaru Golari, A Venugopal, V Mohan M Achary, Ganngam Phaomei, Narasimham L Parinandi, Hrushi K Sahu, Brahma B Panda
Zinc oxide nanoparticles (ZnONP-GS) were synthesised from the precursor zinc acetate (Zn(CH₃COO)₂) through the green route using the milky latex from milk weed (Calotropis gigantea L. R. Br) by alkaline precipitation. Formation of the ZnONP-GS was monitored by UV-visible spectroscopy followed by characterization and confirmation by energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Both the ZnONP-GS and the commercially available ZnONP-S (Sigma-Aldrich) and cationic Zn(2+) from Zn(CH₃COO)₂ were tested in a dose range of 0-100 mg·L(-1) for their potency (i) to induce oxidative stress as measured by the generation reactive oxygen species (ROS: O₂(•-), H₂O₂ and (•)OH), cell death, and lipid peroxidation; (ii) to modulate the activities of antioxidant enzymes: catalase (CAT), superoxide dismutase (SOD), guaiacol peroxidase (GPX), and ascorbate peroxidase (APX); and (iii) to cause DNA damage as determined by Comet assay in Lathyrus sativus L...
May 18, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28511875/visible-light-switched-cytosol-release-of-sirna-by-amphiphilic-fullerene-derivative-to-enhance-rnai-efficacy-in-vitro-and-in-vivo
#7
Jing Wang, Lifei Xie, Tao Wang, Fengxin Wu, Jie Meng, Jian Liu, Haiyan Xu
Cationic macromolecules are attractive for use as small interfering RNA (siRNA) carriers due to their performance in non-immunological reactions, customization during synthesis, and low costs compared to viral carriers. However, their low transfection efficiency substantially hinders their application in both clinical practices and academic research, which is mostly attributable to the low capacity of siRNA/cationic macromolecule complexes to escape lysosomes. To address this challenge, we designed an amphiphilic fullerene derivative (C60-Dex-NH2) for efficient and controllable siRNA delivery...
May 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28511142/tailoring-nanostructured-lipid-carriers-for-the-delivery-of-protein-antigens-physicochemical-properties-versus-immunogenicity-studies
#8
Thomas Courant, Emilie Bayon, Hei Lanne Reynaud-Dougier, Christian Villiers, Mathilde Menneteau, Patrice N Marche, Fabrice P Navarro
New vaccine formulations are still highly anticipated in the near-future to face incoming health challenges, such as emergence or reemergence of severe infectious diseases, immunosenescence associated with elderly or the spread of pathogens resistant to antibiotics. In particular, new nanoparticle-based adjuvants are promising for sub-unit vaccines in order to elicit potent and long lasting immune responses with a better control on their safety. In this context, an innovative delivery system of protein antigens has been designed based on the chemical grafting of the antigen onto the shell of Nanostructured Lipid Carriers (NLC)...
May 3, 2017: Biomaterials
https://www.readbyqxmd.com/read/28508949/zn-ii-dipicolylamine-based-metallo-lipids-as-novel-non-viral-gene-vectors
#9
Rong-Chuan Su, Qiang Liu, Wen-Jing Yi, Zhi-Gang Zhao
In this study, a series of Zn(II)-dipicolylamine (Zn-DPA) based cationic lipids bearing different hydrophobic tails (long chains, α-tocopherol, cholesterol or diosgenin) were synthesized. Structure-activity relationship (SAR) of these lipids was studied in detail by investigating the effects of several structural aspects including the type of hydrophobic tails, the chain length and saturation degree. In addition, several assays were used to study their interactions with plasmid DNA, and results reveal that these lipids could condense DNA into nanosized particles with appropriate size and zeta-potentials...
May 16, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/28504657/engineering-liposomal-nanoparticles-for-targeted-gene-therapy
#10
REVIEW
C Zylberberg, K Gaskill, S Pasley, S Matosevic
Recent mechanistic studies have attempted to deepen our understanding of the process by which liposome-mediated delivery of genetic material occurs. Understanding the interactions between lipid nanoparticles and cells is still largely elusive. Liposome-mediated delivery of genetic material faces systemic obstacles alongside entry into the cell, endosomal escape, lysosomal degradation and nuclear uptake. Rational design approaches for targeted delivery have been developed to reduce off-target effects and enhance transfection...
May 15, 2017: Gene Therapy
https://www.readbyqxmd.com/read/28501692/trans-chalcone-added-in-topical-formulation-inhibits-skin-inflammation-and-oxidative-stress-in-a-model-of-ultraviolet-b-radiation-skin-damage-in-hairless-mice
#11
Renata M Martinez, Felipe A Pinho-Ribeiro, David L Vale, Vinicius S Steffen, Fabiana T M C Vicentini, Josiane A Vignoli, Marcela M Baracat, Sandra R Georgetti, Waldiceu A Verri, Rubia Casagrande
Trans-chalcone (TC) is a common precursor of flavonoids. However, the pharmacological properties of TC remain to be fully understood. The present study investigated whether topical formulation containing TC (TFcTC) presents therapeutic effect in UVB radiation-induced skin damage using disease, enzyme activity, antioxidant activity, protein and mRNA parameters. Control topical formulation (CTF) and TFcTC were applied in hairless mice before and after exposure to UVB radiation. Dorsal skin samples were collected after UVB exposure to evaluate: i) skin edema (weight) was measured by punch biopsy; ii) spectrophotometric assays were used to measure myeloperoxidase (MPO) and catalase activities, ferric (FRAP) and ABTS cation reducing antioxidant power, superoxide anion production and levels of reduced glutathione (GSH); iii) enzymography was used to measure matrix metalloproteinase-9 (MMP-9) activity; iv) chemiluminescence was used to measure the lipid peroxidation (LPO); v) enzyme-linked immunosorbent assay (ELISA) was used to measure tumor necrosis factor alpha (TNF-α) levels; vi) reverse transcription quantitative PCR (RT-qPCR) was used to measure cyclooxygenase-2 (COX-2), gp91(phox) (NADPH oxidase sub-unity), glutathione peroxidase-1 (Gpx1), glutathione reductase (Gr), nuclear factor erythroid 2-related factor 2 (Nrf2), and heme oxygenase-1 (HO-1) mRNA expression...
May 2, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28497975/adjuvants-based-on-synthetic-mycobacterial-cord-factor-analogues-biophysical-properties-of-neat-glycolipids-and-nano-self-assemblies-with-dda
#12
Rie S Kallerup, Henrik Franzyk, Mikkel L Schiøth, Sarah Justesen, Birte Martin-Bertelsen, Fabrice Rose, Cecilie M Madsen, Dennis Christensen, Karen S Korsholm, Anan Yaghmur, Camilla Foged
Synthetic mycobacterial cord factor analogues, e.g., trehalose 6,6'-dibehenate (TDB), are highly promising adjuvants due to their strong immunopotentiating capabilities, but their biophysical properties have remained poorly characterized. Here, we report the synthesis of an array of synthetic TDB analogues varying in acyl chain length, degree of acylation and headgroup display, which was subjected to biophysical characterization of neat non-dispersed self-assembled nanostructures in excess buffer and as aqueous dispersions with cationic dimethyldioctadecylammonium (DDA) bromide...
May 12, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28496125/enhancing-specific-disruption-of-intracellular-protein-complexes-by-hydrocarbon-stapled-peptides-using-lipid-based-delivery
#13
D Thean, J S Ebo, T Luxton, Xue'Er Cheryl Lee, T Y Yuen, F J Ferrer, C W Johannes, D P Lane, C J Brown
Linear peptides can mimic and disrupt protein-protein interactions involved in critical cell signaling pathways. Such peptides however are usually protease sensitive and unable to engage with intracellular targets due to lack of membrane permeability. Peptide stapling has been proposed to circumvent these limitations but recent data has suggested that this method does not universally solve the problem of cell entry and can lead to molecules with off target cell lytic properties. To address these issues a library of stapled peptides was synthesized and screened to identify compounds that bound Mdm2 and activated cellular p53...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28495624/mechanistic-insight-into-interaction-of-sodium-dodecyl-sulphate-to-asialylated-form-of-glycoprotein-a-mimic-of-membrane-protein-lipid-system
#14
Nida Zaidi, Rizwan Hasan Khan
The SDS-glycoprotein system is mimic of membrane protein-lipid system. Fate of glycoprotein, conformation and the interactive forces involved in membrane milieu are expected to be decided by the net charge on glycoprotein that may change during acidic environment in a range of pathological states, including cancer, stroke, and ischemia. Asialofetuin (ASF; asialylated form of glycoprotein) and SDS interaction is studied when glycoprotein bears varying range of net charge (i.e. at different pH's) by steady state and time-resolved spectroscopic, calorimetric and microscopic approaches...
May 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28494740/nucleic-acids-based-nanotherapeutics-crossing-the-blood-brain-barrier
#15
Noha Nafee, Noha Gouda
The restless endeavors revealing the molecular pathways underlying many neurodegenerative diseases and brain tumors have paved the way for the introduction of the selective exogenous gene-based therapeutics. The implicated active biomolecules encompass mainly negatively-charged nucleic acids ranging from DNA, mRNA, non-coding RNAs (small-interfering RNA, siRNA, and microRNA, miRNA), to antisense oligonucleotides. They selectively interfere with the genes translational and/or transcriptional processes. Although many reviews previously addressed brain targeting, a thorough correlation between the molecular properties of these biomacromolecules, the nature of blood brain barrier (BBB) in the accompanying pathological condition, the intracellular targets, as well as the design of the delivery system which will transport the bioactive cargo to the target cells attempting efficient delivery to the active sites in the brain will be appraised...
May 10, 2017: Current Gene Therapy
https://www.readbyqxmd.com/read/28487432/deciphering-mcr-2-colistin-resistance
#16
Jian Sun, Yongchang Xu, Rongsui Gao, Jingxia Lin, Wenhui Wei, Swaminath Srinivas, Defeng Li, Run-Shi Yang, Xing-Ping Li, Xiao-Ping Liao, Ya-Hong Liu, Youjun Feng
Antibiotic resistance is a prevalent problem in public health worldwide. In general, the carbapenem β-lactam antibiotics are considered a final resort against lethal infections by multidrug-resistant bacteria. Colistin is a cationic polypeptide antibiotic and acts as the last line of defense for treatment of carbapenem-resistant bacteria. Very recently, a new plasmid-borne colistin resistance gene, mcr-2, was revealed soon after the discovery of the paradigm gene mcr-1, which has disseminated globally. However, the molecular mechanisms for MCR-2 colistin resistance are poorly understood...
May 9, 2017: MBio
https://www.readbyqxmd.com/read/28482159/cascading-effects-of-nanoparticle-coatings-surface-functionalization-dictates-the-assemblage-of-complexed-proteins-and-subsequent-interaction-with-model-cell-membranes
#17
Eric S Melby, Samuel E Lohse, Ji Eun Park, Ariane M Vartanian, Rebecca A Putans, Hannah B Abbott, Robert J Hamers, Catherine J Murphy, Joel A Pedersen
Interactions of functionalized nanomaterials with biological membranes are expected to be governed by not only nanoparticle physiochemical properties, but also coatings or "coronas" of biomacromolecules acquired after emersion in biological fluids. Here, we prepared a library of 4-5 nm gold nanoparticles (AuNPs) coated with either ω-functionalized thiols or polyelectrolyte wrappings to examine the influence of surface functional groups on the assemblage of proteins complexing the nanoparticles and its subsequent impact on attachment to model biological membranes...
May 8, 2017: ACS Nano
https://www.readbyqxmd.com/read/28476616/preparation-of-liposomes-containing-small-gold-nanoparticles-using-electrostatic-interactions
#18
Gennaro A Dichello, Takahiro Fukuda, Toru Maekawa, Raymond L D Whitby, Sergey V Mikhalovsky, Mohammed Alavijeh, Ananth S Pannala, Dipak K Sarker
The development of liposome-nanoparticle colloid systems offers a versatile approach towards the manufacture of multifunctional therapeutic platforms. A strategy to encapsulate small metallic nanoparticles (<4nm) within multilamellar vesicles, effected by exploiting electrostatic interactions was investigated. Two liposome-gold nanoparticle (lipo-GNP) systems were prepared by the reverse-phase evaporation method employing cationic or anionic surface functionalised particles in combination with oppositely charged lipid compositions with subsequent post-formulation PEGylation...
May 3, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28476090/identifying-the-selectivity-of-antimicrobial-peptides-to-cell-membranes-by-sum-frequency-generation-spectroscopy
#19
Thaddeus W Golbek, Johannes Franz, J Elliott Fowler, Karl F Schilke, Tobias Weidner, Joe E Baio
Cationic amphiphilic peptides have been engineered to target both Gram-positive and Gram-negative bacteria while avoiding damage to other cell types. However, the exact mechanism of how these peptides target, bind, and disrupt bacterial cell membranes is not understood. One specific peptide that has been engineered to selectively capture bacteria is WLBU2 (sequence: RRWVRRVRRWVRRVVRVVRRWVRR). It has been suggested that WLBU2 activity stems from the fact that when interacting with bacterial cell membranes the peptide assumes an α-helical structure and inserts itself into the membrane...
May 5, 2017: Biointerphases
https://www.readbyqxmd.com/read/28476070/peripheral-inflammation-alters-n-arachidonoylphosphatidylethanolamine-20-4-nape-induced-modulation-of-nociceptive-spinal-cord-synaptic-transmission
#20
Vladimir Nerandzic, Petra Mrozkova, Pavel Adamek, Diana Spicarova, Istvan Nagy, Jiri Palecek
BACKGROUND AND PURPOSE: Endocannabinoids play an important role in modulating spinal nociceptive signalling, crucial for the development of pain. The cannabinoid receptor 1 (CB1) and the transient receptor potential cation channel subfamily V member 1 (TRPV1) are both activated by the endocannabinoid anandamide that is a product of biosynthesis from the endogenous lipid precursor N-arachidonoylphosphatidylethanolamine (20:4-NAPE). Here we are first to report CB1 receptor- and TRPV1-mediated effects of 20:4-NAPE application on spinal synaptic transmission in control and inflammatory conditions...
May 5, 2017: British Journal of Pharmacology
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