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https://www.readbyqxmd.com/read/29156336/magnesium-lithospermate-b-loaded-pegylated-solid-lipid-nanoparticles-for-improved-oral-bioavailability
#1
Xuqi Kang, Hui Chen, Shujuan Li, Liyong Jie, Jingbo Hu, Xiaojuan Wang, Jing Qi, Xiaoying Ying, Yongzhong Du
Magnesium lithospermate B (MLB) is an active polyphenol acid with multiple pharmacological activities and poor oral bioavailability. The present research aimed to construct MLB loaded solid lipid nanoparticles (MLB-SLNs) for oral delivery to enhance its bioavailability. MLB-SLNs were prepared by solvent diffusion method and subsequently modified with polyethylene glycol monostearate (PEG-SA) superficially. The particle sizes of MLB-SLNs varied from 82.57 to 53.50nm with an improved drug loading capacity (up to 16...
November 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29156048/unmet-needs-in-clinical-and-basic-hepatitis-b-virus-research
#2
Tung-Hung Su, Jia-Horng Kao
Chronic hepatitis B (CHB) has become a treatable and controllable disease. The current nucleos(t)ide analogue (NUC) and pegylated interferon therapies effectively help slow disease progression and reduce the risk of cirrhosis, hepatocellular carcinoma (HCC), and CHB-associated mortality. Long-term viral suppression is easily achievable by NUC therapy, with limited adverse reactions. However, several unmet requirements still exist, including safety and risk-stratified HCC surveillance among patients who received long-term NUC therapy...
November 16, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29156046/toward-a-cure-for-hepatitis-b-virus-infection-combination-therapy-involving-viral-suppression-and-immune-modulation-and-long-term-outcome
#3
Di Wu, Qin Ning
Chronic hepatitis B virus (HBV) infection remains a major global health burden. Currently, the approved therapeutic regimens include nucleos(t)ide analogues (NAs) and either interferon or pegylated interferon. NA therapy is generally safe and well tolerated, but the rate of posttreatment virologic relapse is high, making NA treatment a lifetime commitment. The benefits of pegylated interferon treatment include a finite duration, more-durable response and absence of viral resistance. However, sustained response to interferon alone is achieved only in a minority of patients, and side effects are common, which limit its clinical use...
November 16, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29154875/optimization-of-pegylation-reaction-time-and-molar-ratio-of-rhg-csf-toward-increasing-bioactive-potency-of-monopegylated-protein
#4
Jamila Behi, RymHassiki, Nadia Ben Said, Balkiss Bouhaouala-Zahar, Mohamed Lamine Benkhoud
PEGylation is one of the strategies used for enhancing in vivo residence time of recombinant human Granulocyte Colony-Stimulating Factor (rhG-CSF) and therefore reducing in dose frequency to better fit with patient comfort treatment. In this study, three methoxy polyethylene glycol propionaldehydes (mPEG- ALD) of 10, 20 and 30kDa MW were utilized to produce biologically active monoPEGylated rhG-CSF with enhanced molecular weight. PEGylation reactions were carried out at room temperature and pH 5.0 in the presence of cyanoborohydride and two mPEG-ALD: protein molar ratios (3:1 and 5:1)...
November 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29154484/memantine-loaded-pegylated-biodegradable-nanoparticles-for-the-treatment-of-glaucoma
#5
Elena Sánchez-López, Maria Antonia Egea, Benjamin Michael Davis, Li Guo, Marta Espina, Amelia Maria Silva, Ana Cristina Calpena, Eliana Maria Barbosa Souto, Nivedita Ravindran, Miren Ettcheto, Antonio Camins, Maria Luisa García, Maria Francesca Cordeiro
Glaucoma is a multifactorial neurodegenerative disease associated with retinal ganglion cells (RGC) loss. Increasing reports of similarities in glaucoma and other neurodegenerative conditions have led to speculation that therapies for brain neurodegenerative disorders may also have potential as glaucoma therapies. Memantine is an N-methyl-d-aspartate (NMDA) antagonist approved for Alzheimer's disease treatment. Glutamate-induced excitotoxicity is implicated in glaucoma and NMDA receptor antagonism is advocated as a potential strategy for RGC preservation...
November 20, 2017: Small
https://www.readbyqxmd.com/read/29153714/polyphosphonate-ligands-from-synthesis-to-design-of-hybrid-pegylated-nanoparticles-toward-phototherapy-studies
#6
Maelle Monteil, Hanane Moustaoui, Gennaro Picardi, Fatima Aouidat, Nadia Djaker, Marc Lamy de La Chapelle, Marc Lecouvey, Jolanda Spadavecchia
The use of phosphonate ligands to modify the nanoparticle (NPs) surface has attracted a strong interest in the last years for the design of highly functional hybrid materials. Here, we applied a methodology to synthesize bisphosphonates having functionalized PEG side chains with a specific length in order to design a novel class of hybrid nanomaterials composed by tetraphosphonate-complex-gold COOH-terminated PEG-coated NPs (Bis-PO-PEG-AuNPs). The synthetic approach consist in three steps: (1) Complexation between new phosphonate ligands (Bis PO) and tetrachloroauric acid (HAuCl4) to form gold clusters; (2) adsorption of COOH-terminated PEG molecules (PEG) onto Bis PO-Au complex; (3) reduction of metal ions in that vicinity, growth of gold particles and colloidal stabilization...
November 2, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29153606/pegylated-interferon-beta-in-the-treatment-of-the-theiler-s-murine-encephalomyelitis-virus-mouse-model-of-multiple-sclerosis
#7
Francesca Gilli, Darlene B Royce, Krista D DiSano, Andrew R Pachner
We evaluated the effects of pegylated-interferonβ-1a (pegIFNβ) therapy on intrathecal antibody responses, disability progression, and viral load in the CNS in mice infected with the Theiler's virus (TMEV), an animal model of progressive disability in Multiple Sclerosis (MS). The lack of a direct antiviral activity in the CNS, the absence of any effect upon the intrathecal immune response, and the failure to treat disease progression, indicate that the immunomodulatory effects of pegIFNβ-1a likely occur in the systemic circulation rather than within the CNS...
December 15, 2017: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/29152858/in-vitro-evaluation-of-anti-aggregation-and-degradation-behavior-of-pegylated-polymeric-nanogels-under-in-vivo-like-conditions
#8
Yinan Chen, George R Dakwar, Kevin Braeckmans, Twan Lammers, Wim E Hennink, Josbert M Metselaar
The in vivo stability and biodegradability of nanocarriers crucially determine therapeutic efficacy as well as safety when used for drug delivery. This study aims to evaluate optimized in vitro techniques predictive for in vivo nanocarrier behavior. Polymeric biodegradable nanogels based on hydroxyethyl methacrylamide-oligoglycolates-derivatized poly(hydroxyethyl methacrylamide-co-N-(2-azidoethyl)methacrylamide) and with various degrees of PEGylation and crosslinking densities are prepared. Three techniques are chosen and refined for specific in vitro evaluation of the nanocarrier performance: (1) fluorescence single particle tracking (fSPT) to study the stability of nanogels in human plasma, (2) tangential flow filtration (TFF) to study the degradation and filtration of nanogel degradation products, and (3) fluorescence fluctuation spectroscopy (FFS) to evaluate and compare the degradation behavior of nanogels in buffer and plasma...
November 20, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/29152762/optimizing-lonafarnib-treatment-for-the-management-of-chronic-delta-hepatitis-the-lowr-hdv-1-study
#9
Cihan Yurdaydin, Onur Keskin, Çağdaş Kalkan, Fatih Karakaya, Aysun Çalişkan, Ersin Karatayli, Senem Karatayli, A Mithat Bozdayi, Christopher Koh, Theo Heller, Ramazan Idilman, Jeffrey S Glenn
BACKGROUND AND RATIONALE: In a proof-of-concept (POC) study, the oral prenylation inhibitor lonafarnib (LNF) decreased HDV RNA during 4 weeks of treatment. Here we explored optimal LNF regimens. METHODS: 15 patients (5 groups; 3 per group) completed dosing as follows: 1) LNF 200 mg BID (12 weeks); 2) LNF 300 mg BID (12 weeks); 3) LNF 100 mg TID (5 weeks); 4) LNF 100 mg BID + pegylated interferon alfa (PEG-IFNα) 180 mcg QW (8 weeks); and 5) LNF 100 mg BID + ritonavir (RTV) 100 mg QD (8 weeks)...
November 20, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29152412/histomorphological-responses-after-therapy-with-pegylated-interferon-%C3%AE-2a-in-patients-with-essential-thrombocythemia-et-and-polycythemia-vera-pv
#10
Lucia Masarova, C Cameron Yin, Jorge E Cortes, Marina Konopleva, Gautam Borthakur, Kate J Newberry, Hagop M Kantarjian, Carlos E Bueso-Ramos, Srdan Verstovsek
Background: Pegylated interferon alfa-2a (PEG-IFN-α-2a) is a potent immunomodulating agent capable of inducing high rate of hematologic and even complete molecular remission in patients with essential thrombocythemia (ET) and polycythemia vera (PV). We recently reported results of a phase 2 trial of PEG-IFN-α-2a in 83 patients with ET and PV after a median follow-up of 83 months. Here we report an analysis of bone marrow (BM) responses in these patients. Methods: Among 83 patients, 58 (70%, PV 25, ET 31) had evaluable BM samples...
2017: Experimental Hematology & Oncology
https://www.readbyqxmd.com/read/29151826/renal-clearable-pegylated-porphyrin-nanoparticles-for-image-guided-photodynamic-cancer-therapy
#11
Liang Cheng, Dawei Jiang, Anyanee Kamkaew, Hector F Valdovinos, Hyung-Jun Im, Liangzhu Feng, Christopher G England, Shreya Goel, Todd E Barnhart, Zhuang Liu, Weibo Cai
Noninvasive dynamic positron emission tomography (PET) imaging was used to investigate the balance between renal clearance and tumor uptake behaviors of polyethylene glycol (PEG)-modified porphyrin nanoparticles (TCPP-PEG) with various molecular weights. TCPP-PEG10K nanoparticles with clearance behavior would be a good candidate for PET image-guided photodynamic therapy.
September 13, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/29149425/correction-to-efficacy-and-safety-of-full-length-pegylated-recombinant-factor-viii-with-extended-half-life-in-previously-treated-patients-with-hemophilia-a-comparison-of-data-between-the-general-and-japanese-study-populations
#12
Keiji Nogami, Midori Shima, Katsuyuki Fukutake, Teruhisa Fujii, Masashi Taki, Tadashi Matsushita, Satoshi Higasa, Tetsuji Sato, Michio Sakai, Morio Arai, Haruhiko Uchikawa, Werner Engl, Brigitt Abbuehl, Barbara A Konkle
The authors would like to correct the error in Table 2 in the original publication of the article. The "Blood type" is not described in any part of "Results" and "Discussion" and had no impact on the conclusion hence the bottom of the table is removed.
November 17, 2017: International Journal of Hematology
https://www.readbyqxmd.com/read/29148719/effect-of-antigen-retrieval-methods-on-non-specific-binding-of-anti-body-metal-nanoparticle-conjugates-on-ffpe-tissue
#13
Yuying Zhang, Xinping Wang, Sven Perner, Ágnes Bánkfalvi, Sebastian Schlücker
Immunohistochemical analysis of FFPE tissues provides important diagnostic and prognostic information in pathology. Metal nanoparticles (NPs) and in particular surface-enhanced Raman scattering (SERS) nanotags as a new class of labelling reagents are promising to be used for multiplexed protein profiling on tissue sections. However, non-specific binding of NPs onto the tissue specimens greatly hampers their clinical applications. In this study, we found that the antigen retrieval method strongly influences the extent of non-specific binding of the antibody-SERS NP conjugates to the tissue...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148698/chelator-free-conjugation-of-99mtc-and-gd3-to-pegylated-nanographene-oxide-for-dual-modality-spect-mr-imaging-of-lymph-nodes
#14
Tianye Cao, Xiaobao Zhou, Yingying Zheng, Yuyun Sun, Jian Zhang, Wei Chen, Jianping Zhang, Zhiguo Zhou, Shi-Ping Yang, Yingjian Zhang, Hong Yang, Ming-Wei Wang
PEGylated ultra-small nanographene oxide (usNGO-PEG) has exhibited great potential in nanotheranostics due to its newly-discovered physicochemical properties derived from the rich functional groups and  bonds. Herein, we developed a general, simple and kit-like preparation approach for 99mTcI- and Gd-anchored NGO-PEG using a chelator-free strategy. In this strategy, [99mTcI(CO)3(OH2)3]+ (abbreviated to 99mTcI) and GdCl3 were mixed with usNGO-PEG to yield 99mTc- and Gd-usNGO-PEG via the synergistic coordination of N and O atoms from NGO and PEG with 99mTcI and Gd3+ without additional exogenous chelators...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29147682/synthesis-and-application-of-injectable-bioorthogonal-dendrimer-hydrogels-for-local-drug-delivery
#15
Leyuan Xu, Remy C Cooper, Juan Wang, W Andrew Yeudall, Hu Yang
We developed novel dendrimer hydrogels (DH)s on the basis of bioorthogonal chemistry, in which polyamidoamine (PAMAM) dendrimer generation 4.0 (G4) functionalized with strained alkyne dibenzocyclooctyne (DBCO) via PEG spacer (Mn = 2,000 g/mol) underwent strain-promoted azide-alkyne cycloaddition (SPAAC) with polyethylene glycol bisazide (PEG-BA) (Mn= 20,000 g/mol) to generate a dendrimer-PEG cross-linked network. This platform offers a high degree of functionality and modularity. A wide range of structural parameters including dendrimer generation, degree of PEGylation, loading density of clickable DBCO groups, PEG-BA chain length as well as the ratio of clickable dendrimer to PEG-BA and their concentrations can be readily manipulated to tune chemical and physical properties of DHs...
August 14, 2017: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/29147645/real-world-cure-rates-for-hepatitis-c-virus-treatments-that-include-simeprevir-and-or-sofosbuvir-are-comparable-to-clinical-trial-results
#16
Kian Bichoupan, Neeta Tandon, James F Crismale, Joshua Hartman, David Del Bello, Neal Patel, Sweta Chekuri, Alyson Harty, Michel Ng, Keith M Sigel, Meena B Bansal, Priya Grewal, Charissa Y Chang, Jennifer Leong, Gene Y Im, Lawrence U Liu, Joseph A Odin, Nancy Bach, Scott L Friedman, Thomas D Schiano, Ponni V Perumalswami, Douglas T Dieterich, Andrea D Branch
AIM: To assess the real-world effectiveness and cost of simeprevir (SMV), and/or sofosbuvir (SOF)-based therapy for chronic hepatitis C virus (HCV) infection. METHODS: The real-world performance of patients treated with SMV/SOF ± ribavirin (RBV), SOF/RBV, and SOF/RBV with pegylated-interferon (PEG) were analyzed in a consecutive series of 508 patients with chronic HCV infection treated at a single academic medical center. Patients with genotypes 1 through 4 were included...
November 12, 2017: World Journal of Virology
https://www.readbyqxmd.com/read/29146135/multivalent-oleanolic-acid-human-serum-albumin-conjugate-as-nonglycosylated-neomucin-for-influenza-virus-capture-and-entry-inhibition
#17
Yang Yang, Hao-Jie He, Hao Chang, Yao Yu, Mei-Bing Yang, Yun He, Zhen-Chuan Fan, Suri S Iyer, Peng Yu
We report the synthesis of multivalent oleanolic acid (OA) protein conjugates as nonglycosylated neomucin mimic for the capture and entry inhibition of influenza viruses. Oleanolic acid derivatives bearing an amine-terminated linker were synthesized by esterification of carboxylic acid and further grafted onto the human serum albumin (HSA) via diethyl squarate method. The binding of hemagglutinin (HA) on the virion surface to the synthetic neomucin was evaluated by hemagglutination inhibition assay. The influenza virus capture ability of the PEGylated OA-HSA conjugate was further investigated by Dynamic Light Scattering (DLS), virus capture assay and Isothermal Titration Calorimeter (ITC) techniques...
October 28, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29145802/effectiveness-of-current-and-future-regimens-for-treating-genotype-3-hepatitis-c-virus-infection-a-large-scale-systematic-review
#18
Hosnieh Fathi, Andrew Clark, Nathan R Hill, Geoffrey Dusheiko
BACKGROUND: Six distinct genetic variants (genotypes 1 - 6) of hepatitis C virus (HCV) exist globally. Certain genotypes are more prevalent in particular countries or regions than in others but, globally, genotype 3 (GT3) is the second most common. Patients infected with HCV GT1, 2, 4, 5 or 6 recover to a greater extent, as measured by sustained virological response (SVR), following treatment with regimens based on direct-acting antivirals (DAAs) than after treatment with older regimens based on pegylated interferon (Peg-IFN)...
November 16, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29144019/pegylated-precision-segments-based-on-sequence-defined-thiolactone-oligomers
#19
Sensu Celasun, Filip E Du Prez, Hans G Börner
A straightforward access route to multifunctional block copolymers, combining a poly(ethylene glycol) (PEG) block and a monodisperse segment with discrete monomer sequence based on thiolactone chemistry, is described. Exploiting an inverse conjugation strategy on a PEG preloaded poly(styrene) synthesis resin enables the convenient introduction of a predefined PEG-block at the α-terminus of thiolactone-based sequence-defined oligomers. Reaction conditions for the stepwise, submonomer synthesis at polar solid supports are optimized, using sequential synthesis on a model resin that enables to isolate and determine the purity of the oligomer segments by liquid chromatography-electrospray ionization mass spectrometry analysis...
November 16, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29143777/margination-of-fluorescent-polylactic-acid-polyaspartamide-based-nanoparticles-in-microcapillaries-in-vitro-the-effect-of-hematocrit-and-pressure
#20
Emanuela Fabiola Craparo, Rosa D'Apolito, Gaetano Giammona, Gennara Cavallaro, Giovanna Tomaiuolo
The last decade has seen the emergence of vascular-targeted drug delivery systems as a promising approach for the treatment of many diseases, such as cardiovascular diseases and cancer. In this field, one of the major challenges is carrier margination propensity (i.e., particle migration from blood flow to vessel walls); indeed, binding of these particles to targeted cells and tissues is only possible if there is direct carrier-wall interaction. Here, a microfluidic system mimicking the hydrodynamic conditions of human microcirculation in vitro is used to investigate the effect of red blood cells (RBCs) on a carrier margination in relation to RBC concentration (hematocrit) and pressure drop...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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