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https://www.readbyqxmd.com/read/29149721/biological-safety-and-tissue-distribution-of-16-mercaptohexadecyl-trimethylammonium-bromide-modified-cationic-gold-nanorods
#1
Monika Zarska, Michal Sramek, Filip Novotny, Filip Havel, Andrea Babelova, Blanka Mrazkova, Oldrich Benada, Milan Reinis, Ivan Stepanek, Kamil Musilek, Jiri Bartek, Monika Ursinyova, Ondrej Novak, Rastislav Dzijak, Kamil Kuca, Jan Proska, Zdenek Hodny
The exceptionally high cellular uptake of gold nanorods (GNRs) bearing cationic surfactants makes them a promising tool for biomedical applications. Given the known specific toxic and stress effects of some preparations of cationic nanoparticles, the purpose of this study was to evaluate, in an in vitro and in vivo in mouse, the potential harmful effects of GNRs coated with (16-mercaptohexadecyl)trimethylammonium bromide ((MTAB)GNRs). Interestingly, even after cellular accumulation of high amounts of (MTAB)GNRs sufficient for induction of photothermal effect, no genotoxicity (even after longer-term accumulation), induction of autophagy, destabilization of lysosomes (dominant organelles of their cellular destination), alterations of actin cytoskeleton, or in cell migration could be detected in vitro...
November 1, 2017: Biomaterials
https://www.readbyqxmd.com/read/29141534/characterization-methods-for-solid-lipid-nanoparticles-sln-and-nanostructured-lipid-carriers-nlc
#2
Velichka Andonova, Petya Peneva
BACKGROUND: Solid lipid nanoparticles (SLN) and the next generation of nanostructured lipid carriers (NLC) seem to be a very promising alternative to other colloidal carriers such as liposomes, microemulsions, and polymeric nanoparticles. These combine the advantages of the cited nanocarriers and can improve the dissolution rate in biological fluids, increase the drug absorption, improve the tissue distribution in the target organ, enhance the drug bioavailability and ensure controlled drug release...
November 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29138462/the-antibacterial-and-anti-inflammatory-activity-of-chicken-cathelicidin-2-combined-with-exogenous-surfactant-for-the-treatment-of-cystic-fibrosis-associated-pathogens
#3
Brandon J H Banaschewski, Brandon Baer, Christina Arsenault, Teah Jazey, Edwin J A Veldhuizen, Johan Delport, Tracey Gooyers, James F Lewis, Henk P Haagsman, Ruud A W Veldhuizen, Cory Yamashita
Cystic fibrosis (CF) is characterized by recurrent airway infections with antibiotic-resistant bacteria and chronic inflammation. Chicken cathelicin-2 (CATH-2) has been shown to exhibit antimicrobial activity against antibiotic-resistant bacteria and to reduce inflammation. In addition, exogenous pulmonary surfactant has been suggested to enhance pulmonary drug delivery. It was hypothesized that CATH-2 when combined with an exogenous surfactant delivery vehicle, bovine lipid extract surfactant (BLES), would exhibit antimicrobial activity against CF-derived bacteria and downregulate inflammation...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29117504/experimentally-designed-lyophilized-dry-emulsion-tablets-for-enhancing-the-antihyperlipidemic-activity-of-atorvastatin-calcium-preparation-in-vitro-evaluation-and-in-vivo-assessment
#4
Alaa H Salama, Mona Basha, Sally El Awdan
This article presents the development of lyophilized orally disintegrating tablets prepared with the dry emulsion technique to enhance the in-vitro dissolution and in-vivo performance of the poorly bioavailable drug atorvastatin calcium (ATV). Tablets were fabricated by freeze-drying o/w emulsions of ATV. The Emulsions were prepared using a matrix former solution (alginate or gelatin, 2 or 4%) containing a sugar alcohol (mannitol) and a collapse protectant (glycine) as the water phase and Labrafac® as the oil phase in the presence of surfactant (synperonic® PE/P 84 or synperonic® F108) under proper homogenization...
November 5, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29096375/solid-lipid-nanoparticles-for-delivery-of-andrographolide-across-the-blood-brain-barrier-in-vitro-and-in-vivo-evaluation
#5
Giulia Graverini, Vieri Piazzini, Elisa Landucci, Daniela Pantano, Pamela Nardiello, Fiorella Casamenti, Domenico E Pellegrini-Giampietro, Anna Rita Bilia, Maria Camilla Bergonzi
Andrographolide is a major diterpenoid of Andrographis paniculata and possesses several biological activities, including protection against oxidative stress mediated neurotoxicity, inflammation-mediated neurodegeneration, and cerebral ischemia. However, this molecule shows low bioavailability, poor water solubility, and high chemical and metabolic instability. The present study reports preparation of solid lipid nanoparticles (SLN) to deliver andrographolide (AG) into the brain. SLN were prepared using Compritol 888 ATO as solid lipid and Brij 78 as surfactant and applying emulsion/evaporation/solidifying method as preparative procedure...
October 27, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29076741/correlating-in-vitro-solubilization-and-supersaturation-profiles-with-in-vivo-exposure-for-lipid-based-formulations-of-the-cetp-inhibitor-cp-532-623
#6
Claire L McEvoy, Natalie L Trevaskis, Orlagh M Feeney, Glenn A Edwards, Michael E Perlman, Catherine M Ambler, Christopher J H Porter
Lipid based formulations (LBFs) are a promising formulation strategy for many poorly water-soluble drugs and have been shown previously to enhance the oral exposure of CP-532,623, an oral cholesteryl ester transfer protein inhibitor. In the current study, an in vitro lipid digestion model was used to probe the relationship between drug solubilization and supersaturation on in vitro dispersion and digestion of LBF containing long chain (LC) lipids and drug absorption in vivo. After in vitro digestion of LBF based on LC lipids, the proportion of CP-532,623 maintained in the solubilized state in the aqueous phase of the digest was highest in formulations containing Kolliphor RH 40, and in most cases outperformed equivalent formulations based on MC lipids...
November 9, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29046150/complex-interplay-between-solubilization-digestion-supersaturation-and-absorption-of-poorly-soluble-drugs-with-lipid-based-formulations
#7
Vincent Jannin
Lipid-based formulations (LBFs) can be effective oral drug delivery systems for poorly water-soluble chemical entities, provided they are designed with careful selection of the excipients, based on their role in the delivery system and in relation to the drug properties [1]. LBFs comprise four types of formulations (type I, II, III A and B, IV) containing mixture of oils, surfactants and hydrophilic cosolvents, some of which are able to self-emulsify in contact with the gastrointestinal medium [2]. Key considerations in the selection step must be the series of mechanisms underpinning oral bioavailability enhancement...
October 18, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/29043919/beyond-survival-5-year-neurodevelopmental-follow-up-of-a-cohort-of-preterm-infants-in-colombo-sri-lanka
#8
S P Sumanasena, D V Vipulaguna, M M Mendis, N S Gunawardena
BACKGROUND: There is a lack of information on long-term neurodevelopmental outcome in preterm neonates in low- and middle-income countries. OBJECTIVES: To describe the developmental attainments of preterm neonates followed up for 5 years and to identify the risk factors for impairment. METHOD: A prospective descriptive cohort study was undertaken in neonates of 34 weeks gestation born within a period of 12 months at a single tertiary maternity and neonatal unit in Colombo, Sri Lanka...
October 18, 2017: Paediatrics and International Child Health
https://www.readbyqxmd.com/read/29042870/update-of-minimally-invasive-surfactant-therapy
#9
REVIEW
Gyu-Hong Shim
To date, preterm infants with respiratory distress syndrome (RDS) after birth have been managed with a combination of endotracheal intubation, surfactant instillation, and mechanical ventilation. It is now recognized that noninvasive ventilation (NIV) such as nasal continuous positive airway pressure (CPAP) in preterm infants is a reasonable alternative to elective intubation after birth. Recently, a meta-analysis of large controlled trials comparing conventional methods and nasal CPAP suggested that CPAP decreased the risk of the combined outcome of bronchopulmonary dysplasia or death...
September 2017: Korean Journal of Pediatrics
https://www.readbyqxmd.com/read/29035425/inhaled-versus-systemic-corticosteroids-for-the-treatment-of-bronchopulmonary-dysplasia-in-ventilated-very-low-birth-weight-preterm-infants
#10
REVIEW
Sachin S Shah, Arne Ohlsson, Henry L Halliday, Vibhuti S Shah
BACKGROUND: This is an update of a review published in 2012. A related review "Inhaled versus systemic corticosteroids for preventing bronchopulmonary dysplasia in ventilated very low birth weight preterm neonates" has been updated as well. Bronchopulmonary dysplasia (BPD) is a serious and common problem among very low birth weight infants, despite the use of antenatal steroids and postnatal surfactant therapy to decrease the incidence and severity of respiratory distress syndrome. Due to their anti-inflammatory properties, corticosteroids have been widely used to treat or prevent BPD...
October 16, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29022536/short-term-outcomes-of-inborn-v-outborn-very-low-birth-weight-neonates-1-500-g-in-the-neonatal-nursery-at-groote-schuur-hospital-cape-town-south-africa
#11
L Gibbs, L Tooke, M C Harrison
BACKGROUND: The Groote Schuur Hospital (GSH) neonatal nursery provides level 3 care for the Metro West Health District in the Western Cape Province of South Africa. Worldwide, very-low-birth-weight (VLBW) neonates delivered in level 3 neonatal units have better outcomes than those transported from other facilities. OBJECTIVES: To identify the characteristics and outcomes of VLBW neonates at GSH, with emphasis on differences between inborns and outborns. METHODS: This was a retrospective cohort study...
September 22, 2017: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/28964949/investigation-of-novel-supersaturating-drug-delivery-systems-of-chlorthalidone-the-use-of-polymer-surfactant-complex-as-an-effective-carrier-in-solid-dispersions
#12
Maria Terezinha França, Rafael Pereira Nicolay, Manoela Klüppel Riekes, Juliana Munari Oliveira Pinto, Hellen Karine Stulzer
Supersaturating drug delivery systems (SDDS), as solid dispersions (SDs), stand out among strategies to enhance bioavailability of poorly soluble drugs. After oral administration, their dissolution in gastrointestinal fluids often leads to supersaturation, which drives to a rapid and sustained absorption. Polymers and surfactants play important roles in SDs through inhibiting precipitation caused by transitions from amorphous into crystalline form, in supersaturated solutions, and also through improving SDs physical stability...
September 28, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28943208/preparation-of-mixed-monoterpenes-edge-activated-pegylated-transfersomes-to-improve-the-in-vivo-transdermal-delivery-efficiency-of-sinomenine-hydrochloride
#13
Juan Wang, Yan Wei, Ya-Rong Fei, Li Fang, Hang-Sheng Zheng, Chao-Feng Mu, Fan-Zhu Li, Yong-Sheng Zhang
Surfactants generally have been used as edge activators of transfersomes. However, surfactants edge activated transfersomes frequently lead to cutaneous irritation, skin lipid loss and other side effects after dermal administration. In this study, mixed monoterpenes edge activated PEGylated transfersomes (MMPTs) were prepared by ethanol injection process with sinomenine hydrochloride as a model drug. The formulation of MMPTs was optimized by an orthogonal design. We investigated skin permeation/deposition characteristics and pharmacokinetics of sinomenine hydrochloride loaded in MMPTs by comparing with liposomes using in vitro skin tests and in vivo cutaneous microdialysis...
November 25, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28937237/selective-inhibition-of-nf-kappab-and-surfactant-therapy-in-experimental-meconium-induced-lung-injury
#14
J Kopincova, P Mikolka, M Kolomaznik, P Kosutova, A Calkovska, D Mokra
Meconium aspiration syndrome (MAS) in newborns is characterized mainly by respiratory failure due to surfactant dysfunction and inflammation. Previous meta-analyses did not prove any effect of exogenous surfactant treatment nor glucocorticoid administration on final outcome of children with MAS despite oxygenation improvement. As we supposed there is the need to intervene in both these fields simultaneously, we evaluated therapeutic effect of combination of exogenous surfactant and selective inhibitor of NF-kappaB (IKK-NBD peptide)...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28936523/mesoporous-zno-nanocapsules-for-the-induction-of-enhanced-antigen-specific-immunological-responses
#15
Sumbul Afroz, Himadri Medhi, Somedutta Maity, Gillipsie Minhas, Srikanth Battu, Jeevan Giddaluru, Koushi Kumar, Pradip Paik, Nooruddin Khan
The application of nanotechnology in vaccinology has fuelled rapid advancement towards the design and development of nanovaccines. Nanoparticles have been found to enhance vaccine efficacy through the spatiotemporal orchestration of antigen delivery to secondary lymphoid organs and antigen-presentation by Antigen Presenting Cells (APCs) synchronized with stimulation of innate and adaptive immune responses. Metal based nanoparticles (MNPs) have been extensively engineered for the generation of nanovaccines owing to their intrinsic adjuvant-like properties and immunomodulatory functions...
October 5, 2017: Nanoscale
https://www.readbyqxmd.com/read/28922658/impact-of-minimally-invasive-surfactant-therapy-in-preterm-infants-at-29-32-weeks-gestation
#16
Peter A Dargaville, Sanoj K M Ali, Hamish D Jackson, Christopher Williams, Antonio G De Paoli
BACKGROUND: Most preterm infants born at 29-32 weeks gestation now avoid intubation in early life, and thus lack the usual conduit through which exogenous surfactant is given if needed. OBJECTIVE: The aim of this work was to examine whether a technique of minimally invasive surfactant therapy used selectively at 29-32 weeks gestation would improve outcomes. METHODS: We studied the impact of selective administration of surfactant (poractant alfa 100-200 mg/kg) by thin catheter in infants with respiratory distress syndrome on continuous positive airway pressure (CPAP)...
September 19, 2017: Neonatology
https://www.readbyqxmd.com/read/28917151/a-novel-self-nanoemulsifying-formulation-for-sunitinib-evaluation-of-anticancer-efficacy
#17
R Nazari-Vanani, N Azarpira, H Heli, K Karimian, N Sattarahmady
Breast cancer is the top cancer and a main cause of death among women. The incidence of this cancer is increasing in the world. Sunitinib maleate is an oral, small-molecule, multi-targeted receptor tyrosine kinase inhibitor that inhibits tumor cell proliferation and angiogenesis, and has been administrated as an anticancer drug. Self-nanoemulsifying drug delivery system (SNEDDS) is an isotopic mixture of an oil, a surfactant and usually a co-surfactant, which can spontaneously form fine oil-in-water nanoemulsion in aqueous media...
September 7, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28890215/piperine-pro-nanolipospheres-as-a-novel-oral-delivery-system-of-cannabinoids-pharmacokinetic-evaluation-in-healthy-volunteers-in-comparison-to-buccal-spray-administration
#18
Irina Cherniakov, Dvora Izgelov, Dinorah Barasch, Elyad Davidson, Abraham J Domb, Amnon Hoffman
Nowadays, therapeutic indications for cannabinoids, specifically Δ(9)-tetrahydrocannabinol (THC) and Cannabidiol (CBD) are widening. However, the oral consumption of the molecules is very limited due to their highly lipophilic nature that leads to poor solubility at the aqueous environment. Additionally, THC and CBD are prone to extensive first pass mechanisms. These absorption obstacles render the molecules with low and variable oral bioavailability. To overcome these limitations we designed and developed the advanced pro-nanolipospheres (PNL) formulation...
September 8, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28874611/how-should-aerosols-be-delivered-during-invasive-mechanical-ventilation
#19
Rajiv Dhand
The delivery of aerosols to mechanically ventilated patients presents unique challenges and differs from inhaled drug delivery in spontaneously breathing patients in several respects. Successful aerosol delivery during invasive mechanical ventilation requires careful consideration of a host of factors that influence the amount of drug inhaled by the patient. Pressurized metered-dose inhalers and nebulizers (jet, ultrasonic, and vibrating mesh) are the most commonly used aerosol delivery devices in these patients, although other delivery devices, such as dry powder inhalers, soft mist inhalers, and intratracheal nebulizing catheters, could also be adapted for in-line use...
October 2017: Respiratory Care
https://www.readbyqxmd.com/read/28856015/antenatal-corticosteroid-treatment-for-the-prevention-of-peri-intraventricular-haemorrhage-in-preterm-newborns-a-retrospective-cohort-study-using-transfontanelle-ultrasonography
#20
Bianca A Almeida, Livia T Rios, Edward Araujo Júnior, Luciano M Nardozza, Antonio F Moron, Marília G Martins
OBJECTIVE: The objective of this study was to assess the correlation between antenatal corticosteroids and peri-intraventricular haemorrhage (PIVH) using transfontanelle ultrasonography, as well as to evaluate the risk factors for its incidence. METHODS: We performed a retrospective cohort study using medical records of preterm newborns. The protocol for maternal corticoid administration for foetal lung maturation included dexamethasone 4 mg (intramuscular) 8/8 hours per 48 hours, with one cycle per week...
June 2017: Journal of Ultrasonography
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