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https://www.readbyqxmd.com/read/28636894/effects-of-hpmc-substituent-pattern-on-water-up-take-polymer-and-drug-release-an-experimental-and-modelling-study
#1
Diego Caccavo, Gaetano Lamberti, Anna Angela Barba, Susanna Abrahmsén-Alami, Anna Viridén, Anette Larsson
The purpose of this study was to investigate the hydration behavior of two matrix formulations containing the cellulose derivative hydroxypropyl methylcellulose (HPMC). The two HPMC batches investigated had different substitution pattern along the backbone; the first one is referred to as heterogeneous and the second as homogenous. The release of both the drug molecule theophylline and the polymer was determined. Additionally, the water concentrations at different positions in the swollen gel layers were determined by Magnetic Resonance Imaging...
June 18, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28636892/topical-bioavailability-of-diclofenac-from-locally-acting-dermatological-formulations
#2
S F Cordery, A Pensado, W S Chiu, M Z Shehab, A L Bunge, M B Delgado-Charro, R H Guy
Assessment of the bioavailability of topically applied drugs designed to act within or beneath the skin is a challenging objective. A number of different, but potentially complementary, techniques are under evaluation. The objective of this work was to evaluate in vitro skin penetration and stratum corneum tape-stripping in vivo as tools with which to measure topical diclofenac bioavailability from three approved and commercialized products (two gels and one solution). Drug uptake into, and its subsequent clearance from, the stratum corneum of human volunteers was used to estimate the input rate of diclofenac into the viable skin layers...
June 18, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28636889/complications-of-hematopoietic-stem-transplantation-fungal-infections
#3
REVIEW
Ali S Omrani, Reem S Almaghrabi
Patients undergoing allogeneic hematopoietic stem cell transplantation (HSCT) are at increased risk of invasive fungal infections, especially during the early neutropenic phase and severe graft-versus-host disease. Mold-active prophylaxis should be limited to the highest risk groups. Empiric antifungal therapy for HSCT with persistent febrile neutropenia is associated with unacceptable response rates, unnecessary antifungal therapy, increased risk of toxicity, and inflated costs. Empiric therapy should not be a substitute for detailed work up to identify the cause of fever in such patients...
June 13, 2017: Hematology/oncology and Stem Cell Therapy
https://www.readbyqxmd.com/read/28636828/pharmacokinetic-drug-evaluation-of-extended-release-lorcaserin-for-the-treatment-of-obesity
#4
Kathryn Hurren, Marissa W Dunham
Lorcaserin is a serotonin 2C receptor antagonist that was FDA approved in 2012. Lorcaserin is recently available as an extended-release (ER) formulation for the treatment of obesity as an adjunct to lifestyle modification. Areas covered: The pharmacokinetics, pharmacodynamics, efficacy, and safety of lorcaserin ER will be reviewed. Expert opinion: Lorcaserin ER 20mg daily provides drug exposure bioequivalent to lorcaserin immediate release (IR) 10mg twice daily. Lorcaserin IR is associated with 3.3% and 3.0% placebo-subtracted weight loss in patients without and with diabetes, respectively...
June 21, 2017: Expert Opinion on Drug Metabolism & Toxicology
https://www.readbyqxmd.com/read/28636825/a-new-mixed-all-atom-coarse-grained-model-application-to-melittin-aggregation-in-aqueous-solution
#5
Mee Y Shelley, Myvizhi Esai Selvan, Jun Zhao, Volodymyr Babin, Chenyi Liao, Jianing Li, John Clarence Shelley
We introduce a new mixed resolution, all-atom/coarse-grained approach (AACG) for modeling peptides in aqueous solution and apply it to characterizing the aggregation of melittin. All of the atoms in peptidic components are represented while a single site is used for each water molecule. With the full flexibility of the peptide retained, our AACG method achieves speedups by a factor of 3-4 for CPU time reduction and another factor of roughly 7 for diffusion. An Ewald treatment permits the inclusion of long-range electrostatic interactions...
June 21, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28636657/novel-sirna-formulation-to-effectively-knockdown-mutant-p53-in-osteosarcoma
#6
Anup K Kundu, Swathi V Iyer, Sruti Chandra, Amit S Adhikari, Tomoo Iwakuma, Tarun K Mandal
OBJECTIVES: The tumor suppressor p53 plays a crucial role in the development of osteosarcoma. The primary objective of this study is to develop and optimize lipid based nanoparticle formulations that can carry siRNA and effectively silence mutant p53 in 318-1, a murine osteosarcoma cell line. METHODS: The nanoparticles were composed of a mixture of two lipids (cholesterol and DOTAP) and either PLGA or PLGA-PEG and prepared by using an EmulsiFlex-B3 high pressure homogenizer...
2017: PloS One
https://www.readbyqxmd.com/read/28636629/minimal-oscillating-subnetwork-in-the-huang-ferrell-model-of-the-mapk-cascade
#7
Otto Hadač, František Muzika, Vladislav Nevoral, Michal Přibyl, Igor Schreiber
Prompted by the recent growing evidence of oscillatory behavior involving MAPK cascades we present a systematic approach of analyzing models and elucidating the nature of biochemical oscillations based on reaction network theory. In particular, we formulate a minimal biochemically consistent mass action subnetwork of the Huang-Ferrell model of the MAPK signalling that provides an oscillatory response when a parameter controlling the activation of the top-tier kinase is varied. Such dynamics are either intertwined with or separated from the earlier found bistable/hysteretic behavior in this model...
2017: PloS One
https://www.readbyqxmd.com/read/28636480/the-emerging-role-of-pimavanserin-in-the-management-of-parkinson-s-disease-psychosis
#8
Neal Hermanowicz, Gustavo Alva, Fernando Pagan, Alberto J Espay, Amita Patel, Katya Cruz Madrid, Daniel Kremens, Jim Kenney, Sheila Arquette, Gary Tereso, Maria Lopes, Carolyn Farnum
A panel of experts drawn from neurology, psychiatry, geropsychiatry, geriatrics, and pharmacy representatives of 3 health plans convened in New York City on July 30, 2016, with the objective of sharing opinions, ideas, and information regarding the optimal management of Parkinson's disease psychosis (PDP). Three key points emerged from the discussion: (1) Because of the nature of Parkinson's disease and PDP, finding appropriate treatment can prove challenging; (2) emerging therapies may present an opportunity for effective disease management; and (3) moving forward, provider and patient education regarding PDP and available treatment options is essential for well-managed symptoms and better quality of life...
June 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/28636463/optimization-of-an-anti-her2-nanobody-expression-using-the-taguchi-method
#9
Alireza Farasat, Fatemeh Rahbarizadeh, Davoud Ahmadvand, Fatemeh Yazdian
Despite being widely used in immunotherapy of cancer, whole antibodies are limited by several disadvantages. This has led to the advent of novel biomolecules such as nanobodies. Taguchi method is a statistical experimental design to study the effect of multiple variables in biological processes. In an effort to overexpress a recombinant anti-HER2 nanobody, we carried out a detailed study to find optimal condition of temperature, induction, culture media, vector and host strain, using Taguchi methodology. A total of 16 various experiments were designed...
June 21, 2017: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/28636365/sustainable-elastomers-from-renewable-biomass
#10
Zhongkai Wang, Liang Yuan, Chuanbing Tang
Sustainable elastomers have undergone explosive growth in recent years, partly due to the resurgence of biobased materials prepared from renewable natural resources. However, mounting challenges still prevail: How can the chemical compositions and macromolecular architectures of sustainable polymers be controlled and broadened? How can their processability and recyclability be enabled? How can they compete with petroleum-based counterparts in both cost and performance? Molecular-biomass-derived polymers, such as polymyrcene, polymenthide, and poly(ε-decalactone), have been employed for constructing thermoplastic elastomers (TPEs)...
June 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28636359/relativistic-approximations-to-paramagnetic-nmr-chemical-shift-and-shielding-anisotropy-in-transition-metal-systems
#11
Syed Awais Rouf, Jiří Mareš, Juha Vaara
We apply approximate relativistic methods to calculate the magnetic property tensors, i.e., the g-tensor, zero-field splitting (ZFS) tensor (D), and hyperfine coupling (HFC) tensors, for the purpose of constructing paramagnetic nuclear magnetic resonance (pNMR) shielding tensors. The chemical shift and shielding anisotropy are calculated by applying a modern implementation of the classic Kurland-McGarvey theory (J. Magn. Reson. 1970, 2, 286), which formulates the shielding tensor in terms of the g- and HFC tensors obtained for the ground multiplet, in the case of higher than doublet multiplicity defined by the ZFS interaction...
June 21, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28636347/the-structure-and-dynamics-of-alginate-gels-crosslinked-by-polyvalent-ions-probed-via-solid-state-nmr-spectroscopy
#12
Jiří Brus, Martina Urbanová, Jiri Czernek, Miroslava Pavelkova, Katerina Kubova, Jakub Vyslouzil, Sabina Abbrent, Rafal Konefal, Jiri Horsky, David Vetchy, Jan Vysloužil, Pavel Kulich
Alginate gels are an outstanding biomaterial widely applicable in tissue engineering, medicine, and pharmacy for cell transplantation, wound healing and efficient bioactive agent delivery, respectively. This contribution provides new and comprehensive insight into the atomic-resolution structure and dynamics of polyvalent ion-crosslinked alginate gels in microbead formulations. By applying various advanced solid-state NMR (ssNMR) spectroscopy techniques, we verified the homogenous distribution of the crosslinking ions in the alginate gels and the high degree of ion exchange...
June 21, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28636319/green-catanionic-gemini-surfactant-lichenysin-mixture-improved-surface-antimicrobial-and-physiological-properties
#13
Albert Ruiz, Aurora Pinazo, Lourdes Pérez, Angeles Manresa, Ana M M Marqués
Catanionic surfactant mixtures form a wide variety of organized assemblies and aggregates with improved physicochemical and biological properties. The green catanionic mixture C3(CA)2:lichenysin (molar ratio 8:2) showed antimicrobial synergies against Yersinia enterocolitica, Bacillus subtilis, Escherichia coli O157:H7 and Candida albicans. Flow cytometry and viability studies indicated that this catanionic mixture increases the probability of Y. enterocolitica (38.2%) and B. subtilis (17.1%) cells entering a viable but nonculturable state...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636264/desmopressin-in-haemophilia-the-need-for-a-standardised-clinical-response-and-individualised-test-regimen
#14
S C M Stoof, L M Schütte, F W G Leebeek, M H Cnossen, M J H A Kruip
INTRODUCTION: Due to interindividual variation in desmopressin response, non-severe haemophilia A patients require desmopressin testing prior to therapeutic treatment. However, adequate response or frequency of blood sampling is not standardised in international guidelines. Consequently, various definitions and blood sampling protocols are currently applied. Interestingly, sustainability of desmopressin response is not incorporated into these definitions. AIM: To study desmopressin response rates in a cohort of non-severe haemophilia A patients using currently accepted desmopressin response definitions...
June 21, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28636208/a-phase-i-trial-of-prn1008-a-novel-reversible-covalent-inhibitor-of-bruton-s-tyrosine-kinase-in-healthy-volunteers
#15
Patrick F Smith, Janakan Krishnarajah, Philip A Nunn, Ron J Hill, Dane Karr, D Tam, Mohammad Masjedizadeh, Jens O Funk, Steve G Gourlay
AIM: To evaluate the safety, tolerability, and PK/PD of PRN1008, a novel BTK inhibitor, in healthy volunteers, and thus determine the dose range for future clinical studies. METHODS: This was a two-part randomized, placebo controlled study in healthy volunteers using a liquid formulation. Part I was a single ascending dose design with dose levels of 50 to 1200 mg (n=6 active, 2 placebo per cohort); Part II was a multiple ascending dose design, with dose regimens ranging from 300 mg to 900 mg daily, either qd or bd for 10 days...
June 21, 2017: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28636123/sem-imaging-of-the-stimulatory-response-of-raw264-7-cells-against-porphyromonas-gingivalis-using-a-simple-technique-employing-new-conductive-materials
#16
Chisato Takahashi, Yoshiki Umemura, Ayako Naka, Hiromitsu Yamamoto
In the medical biology, it is essential to understand not only biological morphology but also the interaction between biological materials and agents. To study these, electron microscopy (EM) is often utilized. However, sample preparation techniques for EM require a high level of skill and a considerable time. Here, we conducted EM using a simple technique employing a conductive liquid, BEL-1, and compared the results with another simple technique employing an ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4 ])...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28636048/supramolecular-surface-functionalization-via-catechols-for-the-improvement-of-cell-material-interactions
#17
S Spaans, P P K H Fransen, B D Ippel, D F A de Bont, H M Keizer, N A M Bax, C V C Bouten, P Y W Dankers
Optimization of cell-material interactions is crucial for the success of synthetic biomaterials in guiding tissue regeneration. To do so, catechol chemistry is often used to introduce adhesiveness into biomaterials. Here, a supramolecular approach based on ureido-pyrimidinone (UPy) modified polymers is combined with catechol chemistry in order to achieve improved cellular adhesion onto supramolecular biomaterials. UPy-modified hydrophobic polymers with non-cell adhesive properties are developed that can be bioactivated via a modular approach using UPy-modified catechols...
June 21, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28635496/internet-based-peer-support-for-m%C3%A3-ni%C3%A3-re-s-disease-a-summary-of-web-based-data-collection-impact-evaluation-and-user-evaluation
#18
Ilmari Pyykkő, Vinaya Manchaiah, Hilla Levo, Erna Kentala, Martti Juhola
OBJECTIVE: This paper presents a summary of web-based data collection, impact evaluation, and user evaluations of an Internet-based peer support program for Ménière's disease (MD). DESIGN: The program is written in html-form. The data are stored in a MySQL database and uses machine learning in the diagnosis of MD. The program works interactively with the user and assesses the participant's disorder profile in various dimensions (i.e., symptoms, impact, personal traits, and positive attitude)...
February 9, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28635319/a-case-of-topical-ruxolitinib-treatment-failure-in-alopecia-areata
#19
Maya Deeb, Renée A Beach
Alopecia areata (AA) is an autoimmune-mediated, nonscarring form of hair loss. Despite its prevalence, current management options are limited, especially when the disease has progressed to alopecia totalis (AT) or alopecia universalis (AU). Recent evidence that janus kinase (JAK) signaling contributes to AA pathogenesis prompted the investigation of JAK inhibitors such as tofacitinib and ruxolitinib as possible oral treatments. However, the potential for significant adverse effects with systemic JAK inhibition makes local administration a more attractive option...
June 1, 2017: Journal of Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/28635153/topical-silymarin-administration-for-prevention-of-capecitabine-induced-hand-foot-syndrome-a-randomized-double-blinded-placebo-controlled-clinical-trial
#20
Sepideh Elyasi, Farzaneh Sadat Rezazadeh Shojaee, Abolghasem Allahyari, Gholamreza Karimi
Hand-foot syndrome (HFS) is a frequent dose-limiting adverse reaction of capecitabine in patient with gastrointestinal cancers. Silymarin is a polyphenolic flavonoid extracted from the Silybum marianum that exhibits strong antioxidant and antiinflammatory activities. In this study, we evaluated silymarin efficacy in prevention of capecitabine-induced HFS in patients with gastrointestinal cancers, as the first human study. During this pilot, randomized, double-blinded, placebo-controlled clinical trial, the effect of silymarin gel 1%, which is applied on the palms and soles twice daily starting at the first day of chemotherapy for 9 weeks, on HFS occurrence was assessed...
June 21, 2017: Phytotherapy Research: PTR
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