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Microparticules

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https://www.readbyqxmd.com/read/30547277/microparticulate-p2x7-and-gsdm-d-mediated-regulation-of-functional-il-1%C3%AE-release
#1
Srabani Mitra, Anasuya Sarkar
The pro-inflammatory cytokine IL-1β is a secreted protein that is cleaved by caspase-1 during inflammasome activation upon recognition of internal and external insults to cells. Purinergic receptor P2X7 has been described to be involved in the release pathway of bioactive mature IL-1β by activated immune cells. Microparticle (MP) shedding has also been recently recognized as a manner of cytokine IL-1β release. However, the understanding of purinergic receptor roles in the MP-mediated IL-1β release process is still rudimentary...
December 13, 2018: Purinergic Signalling
https://www.readbyqxmd.com/read/30478052/citrate-based-materials-fuel-human-stem-cells-by-metabonegenic-regulation
#2
Chuying Ma, Xinggui Tian, Jimin P Kim, Denghui Xie, Xiang Ao, Dingying Shan, Qiaoling Lin, Maria R Hudock, Xiaochun Bai, Jian Yang
A comprehensive understanding of the key microenvironmental signals regulating bone regeneration is pivotal for the effective design of bioinspired orthopedic materials. Here, we identified citrate as an osteopromotive factor and revealed its metabonegenic role in mediating citrate metabolism and its downstream effects on the osteogenic differentiation of human mesenchymal stem cells (hMSCs). Our studies show that extracellular citrate uptake through solute carrier family 13, member 5 (SLC13a5) supports osteogenic differentiation via regulation of energy-producing metabolic pathways, leading to elevated cell energy status that fuels the high metabolic demands of hMSC osteodifferentiation...
November 26, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/30238304/composite-microparticles-based-on-natural-mucoadhesive-polymers-with-promising-structural-properties-to-protect-and-improve-the-antifungal-activity-of-miconazole-nitrate
#3
G Tejada, M C Lamas, M Sortino, V A Alvarez, D Leonardi
Oropharyngeal candidiasis is a recurrent oral infection caused by Candida species. Gel formulation containing miconazole nitrate is the most common approach for treating oral candidiasis. However, traditional oral topical antifungal therapies have many limitations, including short contact time with the oral mucosa and the necessity to administrate various doses per day. Thus, the aim of this work was to formulate composited microparticulated systems based on combinations of mucoadhesive cationic, anionic, and nonionic polymers that could protect and modify the drug release rate and therefore avoid a fast dilution of the drug by saliva...
September 20, 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/30126483/effects-of-pollution-on-marine-organisms
#4
Alan J Mearns, Donald J Reish, Matt Bissell, Ann Michelle Morrison, Mary Ann Rempel-Hester, Courtney Arthur, Nicolle Rutherford, Rachel Pryor
This review covers selected 2017 articles on the biological effects of pollutants and human physical disturbances on marine and estuarine plants, animals, ecosystems and habitats. The review, based largely on journal articles, covers field and laboratory measurement activities (bioaccumulation of contaminants, field assessment surveys, toxicity testing and biomarkers) as well as pollution issues of current interest including endocrine disrupters, emerging contaminants, wastewater discharges, marine debris, dredging and disposal etc...
October 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/30120971/influence-of-initial-protein-structures-and-xanthan-gum-on-the-oxidative-stability-of-o-w-emulsions-stabilized-by-whey-protein
#5
Chanchan Sun, Bin Liang, Huanjing Sheng, Ruijun Wang, Jiang Zhao, Zesheng Zhang, Min Zhang
In this article, oil-in-water (O/W) emulsions stabilized by natural whey protein concentrate (WPC) and microparticulated whey protein (MWP) and their mixtures with xanthan gum (XG) were prepared to investigate the lipid oxidative stability of O/W emulsions with the same interfacial composition but different interfacial structures. High-performance size exclusion chromatography, Fourier transform infrared spectrometry, X-ray diffraction analysis and steady-state fluorescence spectroscopy were used to reveal the differences in the structures of natural whey protein and the microparticulated whey proteins (MWP, pH 3...
December 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30090896/effect-of-microparticulation-and-xanthan-gum-on-the-stability-and-lipid-digestion-of-oil-in-water-emulsions-stabilized-by-whey-protein
#6
Chanchan Sun, Rui Liu, Huanjing Sheng, Ruijun Wang, Zesheng Zhang, Jiang Zhao, Min Zhang
Since lipid digestion is an interfacial process, food emulsions are increasingly being seen as a mechanism for controlling lipid uptake. Oil-in-water emulsions stabilized by whey protein (WP) and protein-xanthan gum (XG) mixtures were designed to investigate the influence of interfacial structures on lipid digestion using an in vitro digestion model. The interfacial layers with different structures were designed using microparticulated whey protein (MWP) and MWP-XG mixtures. The increase in the volume average diameter of proteins indicated that the WPs aggregated to form micro-particles during microparticulation...
September 19, 2018: Food & Function
https://www.readbyqxmd.com/read/30086083/simple-lc-ms-ms-methods-using-core-shell-octadecylsilyl-microparticulate-for-the-quantitation-of-total-and-free-daptomycin-in-human-plasma
#7
Yukari Miyadera, Takafumi Naito, Takahiro Yamada, Junichi Kawakami
BACKGROUND: Daptomycin, a cyclic lipopeptide antibiotic, displays high plasma protein binding. This study developed the simple method of liquid chromatographic separation using a core-shell octadecylsilyl microparticulate coupled to tandem mass spectrometry for the quantitation of total and free daptomycin in human plasma. METHODS: Free daptomycin in plasma was obtained by centrifugal ultrafiltration. Deproteinized plasma specimens were directly separated using a core-shell octadecylsilyl microparticulate with isocratic elution...
October 2018: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/30048728/enzyme-structure-and-function-protection-from-gastrointestinal-degradation-using-enteric-coatings
#8
Ruben Gracia, Cristina Yus, Olga Abian, Gracia Mendoza, Silvia Irusta, Victor Sebastian, Vanesa Andreu, Manuel Arruebo
Bovine Serum Albumin (BSA) and Horseradish Peroxidase (HRP) have been encapsulated within microparticulated matrices composed of Eudragit RS100 by the water-in-oil-in-water double emulsion solvent evaporation method. Good encapsulation efficiencies were achieved for BSA and HRP, 88.4 and 95.8%, respectively. The stability of the loaded proteins was confirmed by using circular dichroism and fluorescence. The gastroresistance of the protein-loaded microparticles was evaluated under simulated gastric conditions demonstrating the preservation of the structural integrity of the proteins loaded inside the particles...
November 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30019728/correction-development-of-a-microparticulate-system-containing-brazilian-propolis-by-product-and-gelatine-for-ascorbic-acid-delivery-evaluation-of-intestinal-cell-viability-and-radical-scavenging-activity
#9
Lizziane Maria Belloto de Francisco, Diana Pinto, Hélen Cássia Rosseto, Lucas de Alcântara Sica de Toledo, Rafaela Said Dos Santos, Paulo Costa, Francisca Rodrigues, M Beatriz P P Oliveira, Bruno Sarmento, Marcos Luciano Bruschi
Correction for 'Development of a microparticulate system containing Brazilian propolis by-product and gelatine for ascorbic acid delivery: evaluation of intestinal cell viability and radical scavenging activity' by Lizziane Maria Belloto de Francisco et al., Food Funct., 2018, DOI: 10.1039/c8fo00863a.
August 15, 2018: Food & Function
https://www.readbyqxmd.com/read/29993073/development-of-a-microparticulate-system-containing-brazilian-propolis-by-product-and-gelatine-for-ascorbic-acid-delivery-evaluation-of-intestinal-cell-viability-and-radical-scavenging-activity
#10
Lizziane Maria Belloto de Francisco, Diana Pinto, Hélen Cássia Rosseto, Lucas de Alcântara Sica de Toledo, Rafaela Said Dos Santos, Paulo Costa, Francisca Rodrigues, M Beatriz P P Oliveira, Bruno Sarmento, Marcos Luciano Bruschi
The use of propolis by-product (PBP) microparticles (MP) as delivery systems can be a promising tool to surpass drawbacks related to low stability of ascorbic acid (AA). The objective of this study was to develop and characterize MP prepared with PBP containing AA. The MP was characterized regarding morphology, particle size, polydispersity index (PDI), association efficiency (AE), drug loading (DL), infrared and Raman spectroscopy as well as antioxidant and radical scavenging activity, in vitro release, and cellular studies...
August 15, 2018: Food & Function
https://www.readbyqxmd.com/read/29978475/application-of-the-solubility-parameter-concept-to-assist-with-oral-delivery-of-poorly-water-soluble-drugs-a-pearrl-review
#11
REVIEW
Sandra Jankovic, Georgia Tsakiridou, Felix Ditzinger, Niklas J Koehl, Daniel J Price, Alexandra-Roxana Ilie, Lida Kalantzi, Kristof Kimpe, René Holm, Anita Nair, Brendan Griffin, Christoph Saal, Martin Kuentz
OBJECTIVES: Solubility parameters have been used for decades in various scientific fields including pharmaceutics. It is, however, still a field of active research both on a conceptual and experimental level. This work addresses the need to review solubility parameter applications in pharmaceutics of poorly water-soluble drugs. KEY FINDINGS: An overview of the different experimental and calculation methods to determine solubility parameters is provided, which covers from classical to modern approaches...
July 5, 2018: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/29955853/erratum-to-clinoptilolite-in-dextran-sulphate-sodium-induced-murine-colitis-efficacy-and-safety-of-a-microparticulate-preparation
#12
(no author information available yet)
No abstract text is available yet for this article.
October 12, 2018: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/29893623/mis416-as-a-sirna-delivery-system-with-the-ability-to-target-antigen-presenting-cells
#13
Francesco Mainini, David S Larsen, Gill A Webster, Sarah L Young, Michael R Eccles
MIS416 is a microparticulate formulation derived from propionibacterium acnes cell wall skeletons with intrinsic adjuvant activity. Conjugates of MIS416-SS-peptide containing a disulfide linkage facilitate the cytoplasmic delivery and release of peptides in antigen-presenting cells (APCs). We hypothesized that MIS416-siRNA (small interfering RNA) conjugates, containing a disulfide linkage between MIS416 and the siRNA, would allow cytoplasmic release of siRNA in APCs. MIS416-SS-siStat3 conjugates added to cell culture medium of monolayers of DCs in culture flasks successfully targeted Stat3 mRNA in DCs in vitro without transfection, downregulating Stat3 mRNA and protein levels...
August 2018: Nucleic Acid Therapeutics
https://www.readbyqxmd.com/read/29797461/development-of-inhalable-superparamagnetic-iron-oxide-nanoparticles-spions-in-microparticulate-system-for-antituberculosis-drug-delivery
#14
Margarida S Miranda, Márcia T Rodrigues, Rui M A Domingues, Rui R Costa, Elvira Paz, Carlos Rodríguez-Abreu, Paulo Freitas, Bernardo G Almeida, Maria Alice Carvalho, Carine Gonçalves, Catarina M Ferreira, Egídio Torrado, Rui L Reis, Jorge Pedrosa, Manuela E Gomes
Tuberculosis (TB) is an infectious disease which affects millions of people worldwide. Inhalable polymeric dry powders are promising alternatives as anti-TB drug carriers to the alveoli milieu and infected macrophages, with potential to significantly improve the therapeutics efficiency. Here, the development of a magnetically responsive microparticulate system for pulmonary delivery of an anti-TB drug candidate (P3) is reported. Microparticles (MPs) are developed based on a cast method using calcium carbonate sacrificial templates and incorporate superparamagnetic iron oxide nanoparticles to concentrate MPs in alveoli and enable drug on demand release upon actuation of an external alternate magnetic field (AMF)...
August 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29751274/engineering-mesenchymal-stem-cell-spheroids-by-incorporation-of-mechanoregulator-microparticles
#15
Fatemeh Abbasi, Mohammad Hossein Ghanian, Hossein Baharvand, Bahman Vahidi, Mohamadreza Baghaban Eslaminejad
Mechanical forces throughout human mesenchymal stem cell (hMSC) spheroids (mesenspheres) play a predominant role in determining cellular functions of cell growth, proliferation, and differentiation through mechanotransductional mechanisms. Here, we introduce microparticle (MP) incorporation as a mechanical intervention method to alter tensional homeostasis of the mesensphere and explore MSC differentiation in response to MP stiffness. The microparticulate mechanoregulators with different elastic modulus (34 kPa, 0...
August 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29735044/microparticulated-whey-protein-pectin-complex-a-texture-controllable-gel-for-low-fat-mayonnaise
#16
Chanchan Sun, Rui Liu, Bin Liang, Tao Wu, Wenjie Sui, Min Zhang
This article reports caloric value changes, stability and rheological properties of mayonnaises affected by fat mimetic based on Microparticulated whey protein (MWP) and high-methoxy pectin. Lipid was partially substituted at different levels of 20%, 40%, 60%, 80% and 100%, and the samples were referred to as FM20, FM40, FM60, FM80 and FFM, respectively. The full fat (FF) mayonnaise was used as a control experiment. For rheological properties, the addition of fat mimetic resulted in the gradual decrease of pseudoplastic behavior, relative thixotropic area and viscosity index, while elasticity index exhibited the opposite trend...
June 2018: Food Research International
https://www.readbyqxmd.com/read/29663290/pulmonary-administration-of-microparticulate-antisense-oligonucleotide-aso-for-the-treatment-of-lung-inflammation
#17
Ruhi V Ubale, Prathap Nagaraja Shastri, Carl Oettinger, Martin J D'Souza
Targeted delivery to the lung for controlling lung inflammation is an area that we have explored in this study. The purpose was to use microparticles containing an antisense oligonucleotide (ASO) to NF-κB to inhibit the production of proinflammatory cytokines. Microparticles were prepared using the B-290 Buchi Spray Dryer using albumin as the microparticle matrix. Physicochemical characterization of the microparticles showed the size ranged from 2 to 5 μm, the charge was - 38.4 mV, and they had a sustained release profile over 72 h...
May 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29559402/synergistic-effect-of-plga-nanoparticles-and-submicron-triglyceride-droplets-in-enhancing-the-intestinal-solubilisation-of-a-lipophilic-weak-base
#18
Paul Joyce, Clive A Prestidge
A novel hybrid microparticulate system composed of poly(lactic-co-glycolic) acid (PLGA) nanoparticles and submicron medium-chain triglyceride (MCT) droplets was fabricated to overcome the pH-dependent solubility and precipitation challenges associated with a model poorly water-soluble weak base, cinnarizine (CIN). Molecular CIN was confined within both the lipid and polymer phase of PLGA-lipid hybrid (PLH) and PLGA-lipid-mannitol hybrid (PLMH) particles, which offered significant biopharmaceutical advantages in comparison to the unformulated drug, submicron MCT droplets and PLGA nanoparticles...
June 15, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29504239/development-of-a-m-cell-targeted-microparticulate-platform-bsk02%C3%A2-for-oral-immunization-against-the-ovarian-cancer-antigen-sperm-protein-17
#19
Juha-Pekka Mattila, Leonardo Mirandola, Maurizio Chiriva-Internati
Although it only accounts for approximately 5% of all female cancer cases, ovarian cancer (OC) ranks as the fifth leading cause of death due to cancer in women. We have evaluated the potential of an orally administered microparticulate vaccine incorporating an immunodominant epitope peptide derived from the cancer/testis antigen sperm protein 17 (SP17) aberrantly expressed in OC, to retard the progression of the disease. The peptide antigen and the immune-stimulatory toll-like receptor 9 ligand CpG oligonucleotide were incorporated into spray dried microparticles composed of enteric and sustained release polymers together with the Aleuria aurantia lectin targeting microfold cells present in the gut-associated lymphoid tissue...
March 4, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29484995/biodegradable-microspheres-as-intravitreal-delivery-systems-for-prolonged-drug-release-what-is-their-eminence-in-the-nanoparticle-era
#20
REVIEW
Elisabetta Gavini, Maria C Bonferoni, Giovanna Rassu, Antonella Obinu, Franca Ferrari, Paolo Giunchedi
Drug administration to the posterior segment of the eye has many challenges due to the natural barriers and consequent problems of low and unpredictable bioavailability. There is an increasing need for managing severe posterior eye diseases, such as age-related macular degeneration, diabetic retinopathy, etc. Most of these diseases, if left untreated, lead to blindness. Traditional ocular formulations and topical administrations are almost inefficient and the drug delivery to the back of the eye requires direct administrations through intravitreal injections of innovative drug delivery systems...
2018: Current Drug Delivery
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