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https://www.readbyqxmd.com/read/28531877/folate-n-acetyl-glucosamine-conjugated-mesoporous-silica-nanoparticles-for-targeting-breast-cancer-cells-a-comparative-study
#1
Pramod Kumar, Prajakta Tambe, Kishore M Paknikar, Virendra Gajbhiye
Folate receptors (FR) have been well recognized as a marker to target nano-sized carriers for cancer diagnosis and therapy. In contrast, influx transport systems (e.g. GLUT transporters) that transport essential amino acids and nutrients to cancer cells have not been exploited much for targeted delivery. In this study, folic acid- or n-acetyl glucosamine- functionalized mesoporous silica nanoparticles loaded with doxorubicin (DOX-FA-MSNPs or DOX-NAG-MSNPs) were prepared, characterized and compared for targeting along with cytotoxicity towards MCF-7 and MDA-MB-231 human breast cancer cells...
May 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28528003/acinetobacter-baumannii-k11-and-k83-capsular-polysaccharides-have-the-same-6-deoxy-l-talose-containing-pentasaccharide-k-units-but-different-linkages-between-the-k-units
#2
Johanna J Kenyon, Alexander S Shashkov, Sof'ya N Senchenkova, Mikhail M Shneider, Bin Liu, Anastasiya V Popova, Nikolay P Arbatsky, Konstantin A Miroshnikov, Lei Wang, Yuriy A Knirel, Ruth M Hall
Acinetobacter baumannii produces a variety of capsular polysaccharides (CPS) via genes located at the chromosomal K locus and some KL gene clusters include genes for the synthesis of specific sugars. The structures of K11 and K83 CPS produced by isolates LUH5545 and LUH5538, which carry related KL11a and KL83 gene clusters, respectively, were established by sugar analysis and one- and two-dimensional (1)H and (13)C NMR spectroscopy. Both CPS contain L-rhamnose (L-Rha) and 6-deoxy-L-talose (L-6dTal), and both KL gene clusters include genes for dTDP-L-Rhap synthesis and a tle (talose epimerase) gene encoding an epimerase that converts dTDP-L-Rhap to dTDP-L-6dTalp...
May 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28526845/chemical-structure-of-the-lipid-a-component-of-pseudomonas-sp-strain-pamc-28618-from-thawing-permafrost-in-relation-to-pathogenicity
#3
Han-Gyu Park, Ganesan Sathiyanarayanan, Cheol-Hwan Hwang, Da-Hee Ann, Jung-Ho Kim, Geul Bang, Kyoung-Soon Jang, Hee Wook Ryu, Yoo Kyung Lee, Yung-Hun Yang, Yun-Gon Kim
Climate change causes permafrost thawing, and we are confronted with the unpredictable risk of newly discovered permafrost microbes that have disease-causing capabilities. Here, we first characterized the detailed chemical structure of the lipid A moiety from a Pseudomonas species that was isolated from thawing arctic permafrost using MALDI-based mass spectrometric approaches (i.e., MALDI-TOF MS and MALDI-QIT-TOF MS(n)). The MALDI multi-stage mass spectrometry (MS) analysis of lipid A extracted from the Pseudomonas sp...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526214/high-glucose-environment-induced-intracellular-o-glcnac-glycosylation-and-reduced-galectin-7-expression-in-keratinocytes-implications-on-impaired-diabetic-wound-healing
#4
Shu-Mei Huang, Ching-Shuang Wu, Min-Hsi Chiu, Hui-Jun Yang, Gwo-Shing Chen, Cheng-Che E Lan
BACKGROUND: Diabetes is an important global health issue due to its increasing prevalence and association with various complications. Impaired wound healing is a serious complication associated with diabetes that frequently results in infection and amputation. Galectin-7 (Gal-7) has been reported to play an important role during skin wound healing. Previously, we had demonstrated that high glucose environment alters physiologic functions of keratinocytes and contributes to impaired wound healing in diabetic condition...
April 30, 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/28524084/bordetella-holmesii-lipid-a-structures-and-corresponding-genomic-sequences-comparison-in-three-clinical-isolates-and-the-reference-strain-atcc-51541
#5
Valérie Bouchez, Sami AlBitar-Nehmé, Alexey Novikov, Nicole Guiso, Martine Caroff
Bordetella holmesii can cause invasive infections but can also be isolated from the respiratory tract of patients with whooping-cough like symptoms. For the first time, we describe the lipid A structure of B. holmesii reference strain ATCC 51541 (alias NCTC12912 or CIP104394) and those of three French B. holmesii clinical isolates originating from blood (Bho1) or from respiratory samples (FR4020 and FR4101). They were investigated using chemical analyses, gas chromatography-mass spectrometry (GC-MS), and matrix-assisted laser desorption ionization-mass spectrometry (MALDI-MS)...
May 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28522607/nleb-ssek-effectors-from-citrobacter-rodentium-escherichia-coli-and-salmonella-enterica-display-distinct-differences-in-host-substrate-specificity
#6
Samir El Qaidi, Kangming Chen, Adnan Halim, Lina Siukstaite, Christian Rueter, Ramon Hurtado-Guerrero, Henrik Clausen, Philip R Hardwidge
Many Gram-negative bacterial pathogens use a syringe-like apparatus called a type III secretion system to inject virulence factors into host cells. Some of these effectors are enzymes that modify host proteins to subvert their normal functions. NleB is a glycosyltransferase that modifies host proteins with N-acetyl-D-glucosamine to inhibit antibacterial and inflammatory host responses. NleB is conserved among the attaching/effacing pathogens enterohemorrhagic E. coli (EHEC), enteropathogenic E. coli (EPEC), and Citrobacter rodentium...
May 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28522411/halloysite-and-chitosan-oligosaccharide-nanocomposite-for-wound-healing
#7
Giuseppina Sandri, Carola Aguzzi, Silvia Rossi, Maria Cristina Bonferoni, Giovanna Bruni, Cinzia Boselli, Antonia Icaro Cornaglia, Federica Riva, Cesar Viseras, Carla Caramella, Franca Ferrari
Halloysite is a natural nanotubular clay mineral (HNTs, Halloysite Nano Tubes) chemically identical to kaolinite and, due to its good biocompatibility, is an attractive nanomaterial for a vast range of biological applications. Chitosan oligosaccharides are homo- or heterooligomers of N-acetylglucosamine and D-glucosamine, that accelerate wound healing by enhancing the functions of inflammatory and repairing cells. The aim of the work was the development of a nanocomposite based on HNTs and chitosan oligosaccharides, to be used as pour powder to enhance healing in the treatment of chronic wounds...
May 15, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28522202/a-new-metabolic-route-for-the-fermentative-production-of-5-aminovalerate-from-glucose-and-alternative-carbon-sources
#8
João M P Jorge, Fernando Pérez-García, Volker F Wendisch
Here, a new metabolic pathway for the production of 5-aminovalerate (5AVA) from l-lysine via cadaverine as intermediate was established and this three-step-pathway comprises l-lysine decarboxylase (LdcC), putrescine transaminase (PatA) and γ-aminobutyraldehyde dehydrogenase (PatD). Since Corynebacterium glutamicum is used for industrial l-lysine production, the pathway was established in this bacterium. Upon expression of ldcC, patA and patD from Escherichia coli in C. glutamicum wild type, production 5AVA was achieved...
April 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28522003/lactobacillus-plantarum-cidca-8327-an-%C3%AE-glucan-producing-strain-isolated-from-kefir-grains
#9
M V Gangoiti, A I Puertas, M F Hamet, P J Peruzzo, M G Llamas, M Medrano, A Prieto, M T Dueñas, A G Abraham
Lactobacillus plantarum CIDCA 8327 is an exopolysaccharide (EPS)-producer strain isolated from kefir with promising properties for the development of functional foods. The aim of the present study was to characterize the structure of the EPS synthesized by this strain grown in skim milk or semidefined medium (SDM). Additionally, genes involved in EPS synthesis were detected by PCR. L. plantarum produces an EPS with a molecular weight of 10(4)Da in both media. When grown in SDM produce an heteropolysaccharide composed mainly of glucose, glucosamine and rhamnose meanwhile the EPS produced in milk was composed exclusively of glucose indicating the influence of the sugar source...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28502704/ketogenic-diet-leads-to-o-glcnac-modification-in-the-btbr-t-tf-j-mouse-model-of-autism
#10
Christopher Newell, Virginia L Johnsen, Nellie C Yee, Warren J Xu, Matthias S Klein, Aneal Khan, Jong M Rho, Jane Shearer
BACKGROUND: Protein O-linked-β-N-acetyl glucosamine (O-GlcNAc) is a post-translational modification to Ser/Thr residues that integrates energy supply with demand. Abnormal O-GlcNAc patterning is evident in several neurological disease states including epilepsy, Alzheimer's disease and autism spectrum disorder (ASD). A potential treatment option for these disorders includes the high-fat, low-carbohydrate, ketogenic diet (KD). The goal of this study was to determine whether the KD induces changes in O-GlcNAc in the BTBR(T+tf/j) (BTBR) mouse model of ASD...
May 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28502673/glucosamine-modulates-propranolol-pharmacokinetics-via-intestinal-permeability-in-rats
#11
Hanadi A Al Shaker, Nidal A Qinna, Mujtaba Badr, Mahmoud M H Al Omari, Nasir Idkaidek, Khalid Z Matalka, Adnan A Badwan
Propranolol (PROP) undergoes extensive first-pass metabolism by the liver resulting in a relatively low bioavailability (13-23%); thus, multiple oral doses are required to achieve therapeutic effect. Since some studies have reported that glucosamine (GlcN) can increase the bioavailability of some drugs, therefore, it is aimed to study whether GlcN can change the pharmacokinetic parameters of PROP, thus modulating its bioavailability. When PROP was orally co-administered with GlcN (200mg/kg) to rats, PROP area under curve (AUC) and maximum concentration (Cmax) were significantly decreased by 43% (p<0...
May 11, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28498332/design-synthesis-molecular-docking-analysis-and-carbonic-anhydrase-ix-inhibitory-evaluations-of-novel-n-substituted-%C3%AE-d-glucosamine-derivatives-that-incorporate-benzenesulfonamides
#12
Feng-Ran Li, Zhan-Fang Fan, Su-Jiao Qi, Yan-Shi Wang, Jian Wang, Yang Liu, Mao-Sheng Cheng
A series of novel N-substituted-β-d-glucosamine derivatives that incorporate benzenesulfonamides were designed using a fragment-based drug design strategy. Each derivative was synthesized and evaluated in vitro for its inhibitory activity against human carbonic anhydrase (hCA) IX; several derivatives displayed desirable potency profiles against this enzyme. The molecular docking studies provided the design rationale and predicted potential binding modes for carbonic anhydrase (CA) IX and three target compounds, including the most potent inhibitor, compound 7f (IC50 = 10...
May 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28497240/in-vivo-anticancer-efficacy-and-toxicity-studies-of-a-novel-polymer-conjugate-n-acetyl-glucosamine-nag-peg-doxorubicin-for-targeted-cancer-therapy
#13
Smita Pawar, Ketan Mahajan, Pradeep Vavia
A novel polymer-drug conjugate, polyethylene glycol-N-(acetyl)-glucosamine-doxorubicin (PEG-NAG-DOX) was evaluated in this study for its in vivo potential for treatment of tumours demonstrating improved efficacy and reduced toxicity. The proposed polymer-drug conjugate comprised of polyethylene glycol-maleimide (mPEG-MAL, 30000 Da) as a carrier, doxorubicin (DOX) as an anticancer drug and N-acetyl glucosamine (NAG) as a targeting moiety as well as penetration enhancer. Doxorubicin has a potent and promising anticancer activity; however, severe cardiotoxicity limits its application in cancer treatment...
May 11, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28488115/redesign-of-antifungal-polyene-glycosylation-engineered-biosynthesis-of-disaccharide-modified-npp
#14
Hye-Jin Kim, Seung-Hoon Kang, Si-Sun Choi, Eung-Soo Kim
Polyene macrolides such as nystatin A1 and amphotericin B have been known to be potent antifungal antibiotics for several decades. Because the therapeutic application of polyenes is restricted by severe side effects such as nephrotoxicity, various chemical and biological studies to modify the polyene structure have been conducted to develop less-toxic polyene antifungals. A newly discovered nystatin-like polyene compound NPP was shown to contain an aglycone that was identical to nystatin but harbored a unique di-sugar moiety, mycosaminyl-N-acetyl-glucosamine, which led to higher solubility and reduced hemolytic toxicity...
May 9, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28487126/o-glcnac-modification-inhibits-the-calpain-mediated-cleavage-of-%C3%AE-synuclein
#15
Paul M Levine, Cesar A De Leon, Ana Galesic, Aaron Balana, Nicholas P Marotta, Yuka E Lewis, Matthew R Pratt
The major protein associated with Parkinson's disease (PD) is α-synuclein, as it can form toxic amyloid-aggregates that are a hallmark of many neurodegenerative diseases. α-Synuclein is a substrate for several different posttranslational modifications (PTMs) that have the potential to affect its biological functions and/or aggregation. However, the biophysical effects of many of these modifications remain to be established. One such modification is the addition of the monosaccharide N-acetyl-glucosamine, O-GlcNAc, which has been found on several α-synuclein serine and threonine residues in vivo...
April 29, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28486482/antibiofilm-and-antibacterial-effects-of-specific-chitosan-molecules-on-staphylococcus-aureus-isolates-associated-with-bovine-mastitis
#16
Abdelhamid Asli, Eric Brouillette, Céline Ster, Mariana Gabriela Ghinet, Ryszard Brzezinski, Pierre Lacasse, Mario Jacques, François Malouin
Staphylococcus aureus is one of the major pathogens causing bovine intramammary infections (IMIs) and mastitis. Mastitis is the primary cause for the use of antibiotics in dairy farms but therapeutic failure is often observed. One of the reasons for the lack of effectiveness of antibiotic therapy despite the observed susceptibility of bacterial isolates in vitro are bacterial biofilms. In this study, we used chitosan of well-defined molecular weight (0.4-0.6, 1.3, 2.6 and 4.0 kDa) and investigated their antibiofilm and antibacterial activities in in vitro and in vivo models related to S...
2017: PloS One
https://www.readbyqxmd.com/read/28482153/catalytic-cycle-of-the-n-acetylglucosaminidase-nagz-from-pseudomonas-aeruginosa
#17
Iván Acebrón, Kiran V Mahasenan, Stefania De Benedetti, Mijoon Lee, Cecilia Artola-Recolons, Dusan Hesek, Huan Wang, Juan A Hermoso, Shahriar Mobashery
The N-acetylglucosaminidase NagZ of Pseudomonas aeruginosa catalyzes the first cytoplasmic step in recycling of muropeptides, cell-wall-derived natural products. This reaction regulates gene expression for the β-lactam resistance enzyme, β-lactamase. The enzyme catalyzes hydrolysis of N-acetyl-β-d-glucosamine-(1→4)-1,6-anhydro-N-acetyl-β-d-muramyl-peptide (1) to N-acetyl-β-d-glucosamine (2) and 1,6-anhydro-N-acetyl-β-d-muramyl-peptide (3). The structural and functional aspects of catalysis by NagZ were investigated by a total of seven X-ray structures, three computational models based on the X-ray structures, molecular-dynamics simulations and mutagenesis...
May 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28481047/enhanced-chondrogenic-differentiation-of-stem-cells-using-an-optimized-electrospun-nanofibrous-plla-peg-scaffolds-loaded-with-glucosamine
#18
Samaneh Mirzaei, Akbar Karkhaneh, Masoud Soleimani, Abdolreza Ardeshirylajimi, Hasti Seyyed Zonouzi, Hana Hanaee-Ahvaz
Recently, tissue engineering has become one of the most important approaches in medical research for the treatment of injuries and lesions. In the present study, Poly (L-lactide) acid (PLLA), and Poly ethylene glycol (PEG) with different ratios and PEG molecular weights were used in order to produce appropriate nanofibrous scaffolds using the electrospinning technique for cartilage tissue engineering applications. Glucosamine was also incorporated into the polymeric scaffolds to enhance the biological properties...
May 8, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28480412/using-arthroscopy-to-observe-the-effect-of-liver-softening-medicine-on-knee-osteoarthritis
#19
Chong-Hua Dai, Jun Sun, Xin-Feng Gu, Yu-Xin Zheng
BACKGROUND: Arthroscopy was used to observe the clinical effect of liver-softening medicine for treating knee osteoarthritis (OA). MATERIALS AND METHODS: Forty knee OA patients with cartilage classifications of Outerbridge grade II, III, or II plus III determined via arthroscopy were randomly assigned to a treatment of liver-softening medicine plus glucosamine or a control treatment of glucosamine alone. Clinical observation and determination of the comprehensive effect score were performed at 60, 120, and 180 days...
2017: African Journal of Traditional, Complementary, and Alternative Medicines: AJTCAM
https://www.readbyqxmd.com/read/28474843/n-glycan-in-cockroach-allergen-regulates-human-basophil-function
#20
Danh C Do, Shuang Yang, Xu Yao, Robert G Hamilton, John T Schroeder, Peisong Gao
INTRODUCTION: Cockroach allergen exposure elicits cockroach sensitization and poses an increased risk for asthma. However, the major components in cockroach allergen and the mechanisms underlying the induction of cockroach allergen-induced allergy and asthma remain largely elusive. We sought to examine the role of cockroach-associated glycan in regulating human basophil function. METHODS: N-linked glycans from naturally purified cockroach allergen Bla g 2 were characterized by MALDI-TOF mass spectrometry...
February 20, 2017: Immunity, Inflammation and Disease
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