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https://www.readbyqxmd.com/read/29458204/a-review-of-implantable-biosensors-for-closed-loop-glucose-control-and-other-drug-delivery-applications
#1
Kee Scholten, Ellis Meng
Closed-loop drug delivery promises autonomous control of pharmacotherapy through the continuous monitoring of biomarker levels. For decades, researchers have strived for portable closed-loop systems, capable of treating ambulatory patients with chronic conditions such as diabetes mellitus. After years of development, the first of these systems have left the laboratory and entered commercial use. This long-awaited advance reflects recent development of chronically stable implantable biosensors, able to accurately measure biomarker levels in vivo...
February 16, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29458203/precision-pharmacology-for-alzheimer-s-disease
#2
REVIEW
Harald Hampel, Andrea Vergallo, Lisi Flores Aguilar, Norbert Benda, Karl Broich, A Claudio Cuello, Jeffrey Cummings, Bruno Dubois, Howard J Federoff, Massimo Fiandaca, Remy Genthon, Marion Haberkamp, Eric Karran, Mark Mapstone, George Perry, Lon S Schneider, Lindsay A Welikovitch, Janet Woodcock, Filippo Baldacci, Simone Lista
The complex multifactorial nature of polygenic Alzheimer's disease (AD) presents significant challenges for drug development. AD pathophysiology is progressing in a non-linear dynamic fashion across multiple systems levels - from molecules to organ systems - and through adaptation, to compensation, and decompensation to systems failure. Adaptation and compensation maintain homeostasis: a dynamic equilibrium resulting from the dynamic non-linear interaction between genome, epigenome, and environment. An individual vulnerability to stressors exists on the basis of individual triggers, drivers, and thresholds accounting for the initiation and failure of adaptive and compensatory responses...
February 16, 2018: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29458110/investigation-of-adhesive-interactions-in-the-specific-targeting-of-triptorelin-conjugated-peg-coated-magnetite-nanoparticles-to-breast-cancer-cells
#3
Jingjie Hu, Sina Youssefian, John Obayemi, Karen Malatesta, Nima Rahbar, Winston Soboyejo
The understanding of adhesive interaction at the nanoscale between functionalized nanoparticles and biological cells is of great importance to develop effective theranostic nanocarriers for targeted cancer therapy. Here, we report a combination of experimental and computational approaches to evaluate the adhesion between Triptorelin (a Luteinizing Hormone-Releasing Hormone (LHRH) agonist)-conjugated poly-(ethylene glycol) (PEG)-coated magnetite nanoparticles (Triptorelin-MNPs) and breast cells. The adhesion forces between Triptorelin-MNPs and normal/cancerous breast cells are obtained using atomic force microscopy...
February 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29458108/the-relaxin-receptor-as-a-therapeutic-target-perspectives-from-evolution-and-drug-targeting
#4
REVIEW
Ross A D Bathgate, Martina Kocan, Daniel J Scott, M Akhter Hossain, Sara V Good, Sergey Yegorov, Jan Bogerd, Paul Gooley
The peptide relaxin was first identified as an important circulating hormone during pregnancy over 90 years ago. Research over many years defined the numerous biological roles that relaxin plays throughout pregnancy in many mammalian species. These important biological actions have led to the testing of relaxin as a therapeutic agent for a number of indications. The discovery of the relaxin receptor, RXFP1, in 2002 facilitated the better understanding of the cellular targets of relaxin, its mechanism of action and enabled the development of relaxin mimetics and screening for small molecule agonists...
February 16, 2018: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29457898/synthesis-and-biological-evaluation-of-e-4-hydroxy-3-methylbut-2-enyl-phosphate-hmbp-aryloxy-triester-phosphoramidate-prodrugs-as-activators-of-v%C3%AE-9-v%C3%AE-2-t-cells-immune-response
#5
Martin S Davey, Roshni Malde, Rory C Mykura, Alfie T Baker, Taher E Taher, Cécile S Le Duff, Benjamin E Willcox, Youcef Mehellou
The aryloxy triester phosphoramidate prodrug approach has been used with success in drug discovery. Herein, we describe the first application of this prodrug technology to the monophosphate derivative of the phosphoantigen HMBPP and one of its analogues. Some of these prodrugs exhibited specific and potent activation of Vγ9/Vδ2 T-cells, which were then able to lyse bladder cancer cells in vitro. This work highlights the promise of this prodrug technology in the discovery of novel immunotherapeutics.
February 19, 2018: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29457894/small-molecule-allosteric-modulators-of-g-protein-coupled-receptors-drug-target-interactions
#6
Shaoyong Lu, Jian Zhang
G-protein-coupled receptors (GPCRs) are the largest class of signaling receptors that are most frequently targeted by therapeutic drugs. Allosteric modulators bound to GPCRs at allosteric sites provide the potential for differential selectivity and improved safety compared with traditional orthosteric ligands. The recent breakthroughs in GPCR structural biology have made structures of GPCRs from classes A, B, C, and F complexed with small-molecule allosteric modulators available. Knowledge on the detailed receptor-modulator interactions at the allosteric sites is useful for structure-based GPCR drug design of novel therapeutics...
February 19, 2018: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29457719/fabrication-of-bsa-auncs-based-nanostructures-for-cell-fluoresce-imaging-and-target-drug-delivery
#7
Caifeng Ding, Yujuan Xu, Yanan Zhao, Hua Zhong, Xiliang Luo
Drug delivery which can offer efficient and localized drug transportation together with imaging capabilities is highly demanded in the development of cancer theranostic approaches. Herein, we report the construction of bovine serum albumin (BSA) gold nanoclusters (BSA@AuNCs) for cell fluoresce imaging and target drug delivery. BSA@AuNCs were modified with cyclic arginine-glycine-aspartate (cRGD) with the product RGD-BSA@AuNCs to enhance the cell internalization of the nanoclusters. Furthermore, doxorubicin (DOX), a widely used a chemotherapy drug, was also used to modify RGD-BSA@AuNCs...
February 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29457608/redox-responsive-ucnps-dpa-conjugated-ngo-peg-bpei-dox-for-imaging-guided-ptt-and-chemotherapy-for-cancer-treatment
#8
Arif Gulzar, Jiating Xu, Liangge Xu, Piaoping Yang, Fei He, Dan Yang, Guanghui An, Mohd Bismillah Ansari
The disulfide bond (-S-S-) is an enormously valuable functional group in a variety of chemical and biological agents that display effective reactivity or biological activities (e.g., antitumor activities). The disulfide bonds prevalent in proteins are somewhat oxidizing in the extracellular space; however, such disulfide bonds can rarely be found inside cells because of disulfide cleavage reactions facilitated by abundant free cellular thiols, including glutathione (GSH), which is the most important common thiol-containing small molecule...
February 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29457594/biodistribution-of-colloidal-gold-nanoparticles-after-intravenous-injection-effects-of-pegylation-at-the-same-particle-size
#9
Issei Takeuchi, Haruhiko Onaka, Kimiko Makino
BACKGROUND: Recently, polyethylene glycol (PEG) modified gold nanoparticles have been studied to maintaining long-term stability in biological fluids. Its biodistribution was also reported, however, comparison of bare gold nanoparticles and PEGylated gold nanoparticles with equal particle size is not sufficient. OBJECTIVE: We prepared bare gold nanoparticles and PEGylated gold nanoparticles with diameters of 20-30-nm or 50-nm to avoid the influence of particle diameter, and studied their biodistribution in the mouse...
2018: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/29457592/pegylated-graphene-oxide-fe3o4-nanocomposite-synthesis-characterization-and-evaluation-of-its-performance-as-de-novo-drug-delivery-nanosystem
#10
Abbas Jafarizad, Ali Taghizadehgh-Alehjougi, Morteza Eskandani, Maryam Hatamzadeh, Mojtaba Abbasian, Rahim Mohammad-Rezaei, Maryam Mohammadzadeh, Başak Toğar, Mehdi Jaymand
This paper describes the development of mitoxantrone-loaded PEGylated graphene oxide/magnetite nanoparticles (PEG-GO/Fe3O4-MTX), and investigation of its preliminary drug delivery performance. For this, the GO was synthesized through oxidizing graphite powder, and subsequently carboxylated using a substitution nucleophilic reaction. The carboxylated GO (GO-COOH) was then conjugated with amine end-caped PEG chains by Steglich esterification. Afterward, GO-PEG/Fe3O4 nanocomposite was synthesized through the anchoring of Fe3O4 nanoparticles onto the surface of GO-PEG during the sonication...
2018: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/29457449/catalytically-active-single-chain-polymeric-nanoparticles-exploring-their-functions-in-complex-biological-media
#11
Yiliu Liu, Silvia Pujals, Patrick J M Stals, Thomas Pauloehrl, Stanislav I Presolski, E W Meijer, Lorenzo Albertazzi, Anja R A Palmans
Dynamic single-chain polymeric nanoparticles (SCPNs) are intriguing, bioinspired architectures that result from the collapse or folding of an individual polymer chain into a nanometer-sized particle. Here we present a detailed biophysical study on the behavior of dynamic SCPNs in living cells and an evaluation of their catalytic functionality in such a complex medium. We first developed a number of delivery strategies that allowed the selective localization of SCPNs in different cellular compartments. Live/dead tests showed that the SCPNs were not toxic to cells while spectral imaging revealed that SCPNs provide a structural shielding and reduced the influence from the outer biological media...
February 19, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29457278/zwitterionic-nanocages-overcome-the-efficacy-loss-of-biologic-drugs
#12
Bowen Li, Zhefan Yuan, Peng Zhang, Andrew Sinclair, Priyesh Jain, Kan Wu, Caroline Tsao, Jingyi Xie, Hsiang-Chieh Hung, Xiaojie Lin, Tao Bai, Shaoyi Jiang
For biotherapeutics that require multiple administrations to fully cure diseases, the induction of undesirable immune response is one common cause for the failure of their treatment. Covalent binding of hydrophilic polymers to proteins is commonly employed to mitigate potential immune responses. However, while this technique is proved to partially reduce the antibodies (Abs) reactive to proteins, it may induce Abs toward their associated polymers and thus result in the loss of efficacy. Zwitterionic poly(carboxybetaine) (PCB) is recently shown to improve the immunologic properties of proteins without inducing any antipolymer Abs against itself...
February 19, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29456979/quercetin-prevents-body-weight-loss-due-to-the-using-of-superparamagnetic-iron-oxide-nanoparticles-in-rat
#13
Rezvan Enteshari Najafabadi, Nasrin Kazemipour, Abolghasem Esmaeili, Siamak Beheshti, Saeed Nazifi
Background: Superparamagnetic iron oxide nanoparticles (SPION) have been largely considered for numerous applications in biomedicine such as magnetic resonance imaging, hyperthermia, cell tracking, anticancer treatment, and targeted delivery of drugs or genes. However, they may have side effects such body weight loss. Quercetin (QT), a strong antioxidant and free radical scavenger and a natural flavonoid, has a wide range of biological and therapeutic effects. In this study, the effect of QT on prevention of weight loss due to the using of SPION has been investigated...
2018: Advanced Biomedical Research
https://www.readbyqxmd.com/read/29456858/enhanced-biostability-and-cellular-uptake-of-zinc-oxide-nanocrystals-shielded-with-a-phospholipid-bilayer
#14
B Dumontel, M Canta, H Engelke, A Chiodoni, L Racca, A Ancona, T Limongi, G Canavese, V Cauda
The widespread use of ZnO nanomaterials for biomedical applications, including therapeutic drug delivery or stimuli-responsive activation, as well as imaging, imposes a careful control over the colloidal stability and long-term behaviour of ZnO in biological media. Moreover, the effect of ZnO nanostructures on living cells, in particular cancer cells, is still under debate. This paper discusses the role of surface chemistry and charge of zinc oxide nanocrystals, of around 15 nm in size, which influence their behaviour in biological fluids and effect on cancer cells...
November 28, 2017: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/29456387/clinico-epidemiological-profile-of-pediatric-rheumatology-disorders-in-eastern-india
#15
Pratap Kumar Patra, Manish Kumar
Background: Data on rheumatological disorders in children from developing countries like India are scarce. Hence, this study aimed to understand the clinical and epidemiological profile of rheumatological disorders in children as this can help organize comprehensive evidence-based health care services. Methodology: A retrospective hospital-based study was designed in pediatric rheumatology clinic of the All India Institute of Medical Sciences, Patna, India, from January 2015 to December 2016...
January 2018: Journal of Natural Science, Biology, and Medicine
https://www.readbyqxmd.com/read/29456227/a-case-of-renal-granulomatosis-with-polyangiitis-following-intravesical-bacillus-calmette-gu%C3%A3-rin-therapy
#16
Yosra Selmi, Rania Kheder-Elfekih, Hela Jebali, Lilia Ben Fatma, Wided Smaoui, Madiha Krid, Soumaya Beji, Lamia Rais, Mohamed Karim Zouaghi
Various adverse reactions may occur after intravesical bacillus Calmette-Guérin (BCG) therapy. Although the virulence of attenuated BCG is low, serious complications such as bacterial cystitis, bladder contractures, granulomatous prostatitis, epididymitis, orchitis, and systemic reactions such as fever and malaise have been described. Disseminated granulomatosis such as hepatitis and pneumonitis have also been described, but are rare. We report here the case of a 67-year-old patient who presented with renal granulomatosis with polyangiitis following intravesical BCG therapy for superficial bladder tumor...
January 2018: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/29455987/design-and-biological-response-of-doxycycline-loaded-chitosan-microparticles-for-periodontal-disease-treatment
#17
Silvana Gjoseva, Nikola Geskovski, Simona Dimchevska Sazdovska, Riste Popeski-Dimovski, Gjorgji Petruševski, Kristina Mladenovska, Katerina Goracinova
The aim of this study was to develop chitosan (CS) microparticulated mucoadhesive drug delivery system (DDS) with improved therapeutic performance and biological responce. Ionotropic gelation/spray drying process was used for preparation of doxycycline hyclate (DOXY) loaded low and medium molecular weight (LMw and MMw) CS/sodium tripolyphosphate microparticles (CS/TPP MPs), further coated with ethyl cellulose (EC) using coacervation/solvent displacement technique. The relevant physico-chemical and biopharmaceutical properties were optimized using experimental design approach...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29455885/vincristine-resistance-in-relapsed-neuroblastoma-can-be-efficiently-overcome-by-smac-mimetic-lcl161-treatment
#18
Kristin Frommann, Birgit Appl, Patrick Hundsdoerfer, Konrad Reinshagen, Georg Eschenburg
PURPOSE: In spite of good initial therapy response neuroblastomas often spread to distant organs or relapse after periods of remission. Dysregulation of apoptosis, a hallmark of cancer, is often effected by elevated levels of antiapoptotic signals leading to resistance against chemotherapeutic drugs. Inhibitors of apoptosis proteins (IAPs) are crucial cellular apoptosis regulators. Targeting IAPs with Smac mimetics has been demonstrated as a promising strategy for treatment of neuroblastoma and other tumors...
January 31, 2018: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/29455777/palliative-treatment-of-coronary-atherosclerotic-cancer-by-drug-eluting-or-bare-metal-stents-from-oculo-stenotic-reflex-period-to-age-of-precision-medicine
#19
Elif Hande Ozcan Cetin, Ozcan Ozeke, Erdogan Ilkay, Dursun Aras, Serkan Topaloglu, Zehra Golbasi, Sinan Aydogdu, Can Ozer
Medications and treatments are said to have a palliative effect if they relieve symptoms without having a curative effect on the underlying disease such as atherosclerosis or cancer. Some authors speculated that atherosclerotic coronary artery disease (CAD) could be considered a "cancer of the coronary arterial wall". Although the percutaneous coronary intervention (PCI) has proven to be effective in decreasing mortality rates among patients with acute coronary syndromes, the previous meta-analyses of PCI versus optimal medical therapy for stable CAD have not been able to demonstrate a reduction in major adverse cardiac outcomes...
January 2018: Indian Heart Journal
https://www.readbyqxmd.com/read/29455672/non-abl-directed-inhibitors-as-alternative-treatment-strategies-for-chronic-myeloid-leukemia
#20
REVIEW
Michele Massimino, Stefania Stella, Elena Tirrò, Chiara Romano, Maria Stella Pennisi, Adriana Puma, Livia Manzella, Antonino Zanghì, Fabio Stagno, Francesco Di Raimondo, Paolo Vigneri
The introduction of ABL Tyrosine Kinase Inhibitors (TKIs) has significantly improved the outcome of Chronic Myeloid Leukemia (CML) patients that, in large part, achieve satisfactory hematological, cytogenetic and molecular remissions. However, approximately 15-20% fail to obtain optimal responses according to the current European Leukemia Network recommendation because of drug intolerance or resistance.Moreover, a plethora of evidence suggests that Leukemic Stem Cells (LSCs) show BCR-ABL1-independent survival...
February 19, 2018: Molecular Cancer
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