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Glycosylated Albumin

Andreas Naschberger, Barbara G Fürnrohr, Tihana Lenac Rovis, Suzana Malic, Klaus Scheffzek, Hans Dieplinger, Bernhard Rupp
The monoclonal antibody N14 is used as a detection antibody in ELISA kits for the human glycoprotein afamin, a member of the albumin family, which has recently gained interest in the capture and stabilization of Wnt signalling proteins, and for its role in metabolic syndrome and papillary thyroid carcinoma. As a rare occurrence, the N14 Fab is N-glycosylated at Asn26L at the onset of the VL1 antigen-binding loop, with the α-1-6 core fucosylated complex glycan facing out of the L1 complementarity-determining region...
December 1, 2016: Acta Crystallographica. Section D, Structural Biology
Jianying Chen, Xiaohu Li, Mengyu Feng, Kun Luo, Juan Yang, Bo Zhang
Development of novel materials for enrichment of glycopeptides is the key to a comprehensive analysis of the glycoproteome, which is closely related to several major diseases and biomarker findings. We synthesized phenylboronic acid (PBA) bound to SiO2 microspheres by a thiol-ene click chemistry method (this material was denoted as click PBA) and used it to separate cis-diol-containing molecules and enrich glycopeptides in hydrophilic interaction chromatography mode. Successful preparation of click PBA was confirmed by elemental analysis, X-ray photoelectron spectroscopy, N2 adsorption-desorption isotherms, and high-resolution scanning electron microscopy...
November 29, 2016: Analytical and Bioanalytical Chemistry
Dongpo Xu, Guoquan Yan, Mingxia Gao, Chunhui Deng, Xiangmin Zhang
Glycosylation and phosphorylation as the commonest and most important posttranslational modifications of proteins play critical roles in biological processes. Specific and sensitive strategies have been developed to identify the glycosylation and phosphorylation of proteins by mass spectrometry but most of these methods have mainly focused on enriching glycopeptides or phosphopeptides separately, and few of them can enrich both of them. In this work, highly selective SiO2-NH2@TiO2 hollow microspheres were designed and synthesized for the simultaneous selective enrichment of both phosphopeptides and glycopeptides...
November 29, 2016: Analytical and Bioanalytical Chemistry
Z Q Li, J P Zhang
Objective: To characterize the clinic features of fulminant type 1 diabetes mellitus(FT1DM). Methods: It was a retrospective study analyzing the clinical and laboratory data of patients diagnosed as FT1DM and type 1 diabetes in the Department of Endocrinology in China-Japan Friendship Hospital from January 2011 to November 2015. Results: A total of 125 newly diagnosed type 1 diabetic patients were included in the study, 14 of them (11.2%) met with the criteria of FT1DM. The age at onset was (35.8±8.3) years...
November 1, 2016: Zhonghua Nei Ke za Zhi [Chinese Journal of Internal Medicine]
Paola Sebastiani, Bharat Thyagarajan, Fangui Sun, Lawrence S Honig, Nicole Schupf, Stephanie Cosentino, Mary F Feitosa, Mary Wojczynski, Anne B Newman, Monty Montano, Thomas T Perls
OBJECTIVES: To determine reference values for laboratory tests in individuals aged 85 and older. DESIGN: Cross-sectional cohort study. SETTING: International. PARTICIPANTS: Long Life Family Study (LLFS) participants (N~5,000, age: range 25-110, median 67, 45% male). MEASUREMENTS: Serum biomarkers were selected based on association with aging-related diseases and included complete blood count, lipids (triglycerides, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, total cholesterol), 25-hydroxyvitamin D2 and D3, vitamin D epi-isomer, diabetes mellitus-related biomarkers (adiponectin, insulin, insulin-like growth factor 1, glucose, glycosylated hemoglobin, soluble receptor for advanced glycation endproduct), kidney disease-related biomarkers (albumin, creatinine, cystatin), endocrine biomarkers (dehydroepiandrosterone, sex-hormone binding globulin, testosterone), markers of inflammation (interleukin 6, high-sensitivity C-reactive protein, N-terminal pro b-type natriuretic peptide), ferritin, and transferrin...
November 2016: Journal of the American Geriatrics Society
Susmita Barman, Krishnapura Srinivasan
The cause and effect relationship between diabetes and zinc is complex and unclear. This animal study has examined the potential of zinc supplementation in beneficial modulating hyperglycemia, insulin secretion, and metabolic abnormalities associated with diabetes. The study was conducted in streptozotocin-induced diabetic rats. Groups of hyperglycemic rats were subjected to dietary interventions for 6 weeks with zinc supplementation (5 times and 10 times the normal level). Supplemental-zinc-fed diabetic groups showed significant control on hyperglycemia and hypoinsulinemia...
August 7, 2016: Canadian Journal of Physiology and Pharmacology
Søren B van Witteloostuijn, Søren L Pedersen, Knud J Jensen
Peptides and proteins constitute a vast pool of excellent drug candidates. Evolution has equipped these molecules with superior drug-like properties such as high specificity and potency. However, native peptides and proteins suffer from an inadequate pharmacokinetic profile, and their outstanding pharmacological potential can only be realized if this issue is addressed during drug development. To overcome this challenge, a variety of half-life extension techniques relying on covalent chemical modification have been developed...
November 21, 2016: ChemMedChem
Kyung Jin Yun, Hye Ji Kim, Mee Kyoung Kim, Hyuk Sang Kwon, Ki Hyun Baek, Young Jung Roh, Ki Ho Song
BACKGROUND: Some patients with type 2 diabetes mellitus (T2DM) do not develop diabetic kidney disease (DKD) despite the presence of advanced diabetic retinopathy (DR). We aimed to investigate the presence of DKD and its risk factors in patients with T2DM and advanced DR. METHODS: We conducted a cross-sectional study in 317 patients with T2DM and advanced DR. The phenotypes of DKD were divided into three groups according to the urine albumin/creatinine ratio (uACR, mg/g) and estimated glomerular filtration rate (eGFR, mL/min/1...
September 20, 2016: Diabetes & Metabolism Journal
Parvin Akbarzadehlaleh, Mona Mirzaei, Mahdiyeh Mashahdi-Keshtiban, Karim Shamsasenjan, Hamidreza Heydari
Human serum albumin (HSA) is a non-glycosylated, negatively charged protein (Mw: about 65-kDa) that has one free cystein residue (Cys 34), and 17 disulfide bridges that these bridges have main role in its stability and longer biological life-time (15 to 19 days). As HSA is a multifunctional protein, it can also bind to other molecules and ions in addition to its role in maintaining colloidal osmotic pressure (COP) in various diseases. In critical illnesses changes in the level of albumin between the intravascular and extravascular compartments and the decrease in its serum concentration need to be compensated using exogenous albumin; but as the size of HSA is an important parameter in retention within the circulation, therefore increasing its molecular size and hydrodynamic radius of HSA by covalent attachment of poly ethylene glycol (PEG), that is known as PEGylation, provides HSA as a superior volume expander that not only can prevent the interstitial edema but also can reduce the infusion frequency...
September 2016: Advanced Pharmaceutical Bulletin
Ying Li, Gao Yang, Jinwei Qiang, Songqi Cai, Hao Zhou
OBJECTIVE: To investigate the incidence of insulin resistance (IR) and diabetes in patients with chronic hepatic schistosomiasis japonica (HSJ) and portosystemic shunts (PSS). METHODS: Pre- and post-contrasted computed tomography images obtained from patients with HSJ and control subjects were reviewed by two radiologists who identified and graded any shunting vessels. Anthropometric measurements, hepatic enzymes, lipid profile, blood levels of albumin, glucose, insulin and homeostasis model assessment (HOMA-2) index of all participants were also assessed...
September 29, 2016: Journal of International Medical Research
Petra Darebna, Petr Novak, Radek Kucera, Ondrej Topolcan, Miloslav Sanda, Radoslav Goldman, Petr Pompach
: Alternations in the glycosylation of proteins have been described in connection with several cancers, including hepatocellular carcinoma (HCC) and colorectal cancer. Analytical tools, which use combination of liquid chromatography and mass spectrometry, allow precise and sensitive description of these changes. In this study, we use MRM and FT-ICR operating in full-MS scan, to determine ratios of intensities of specific glycopeptides in HCC, colorectal cancer, and liver metastasis of colorectal cancer...
September 16, 2016: Journal of Proteomics
Paulina Strugała, Anna Dudra, Janina Gabrielska
We investigated the effects of acylated cyanidin-3-O-β-(6″-O-E-p-coumaroyl-sambubioside)-5-O-β-glucoside (C3-cs-5G) and nonacylated cyanidin, cyanidin-3,5-di-O-β-glucoside (C3,5G) and cyanidin-3-O-β-glucoside (C3G), on cell-mimic membranes (MM) that reflected the membrane lipid composition of tumor cells. The relationship between structural derivatives of cyanidin (Cy-d), membrane interactivity, their antioxidant activity, and interaction with albumin were characterized. Studies showed that Cy-d caused an increase in packing order mainly in the hydrophilic region of the membranes...
October 5, 2016: Journal of Agricultural and Food Chemistry
Michael W Traxlmayr, Jonathan D Kiefer, Raja R Srinivas, Elisabeth Lobner, Alison W Tisdale, Naveen K Mehta, Nicole J Yang, Bruce Tidor, K Dane Wittrup
The Sso7d protein from the hyperthermophilic archaeon Sulfolobus solfataricus is an attractive binding scaffold because of its small size (7 kDa), high thermal stability (Tm of 98 °C), and absence of cysteines and glycosylation sites. However, as a DNA-binding protein, Sso7d is highly positively charged, introducing a strong specificity constraint for binding epitopes and leading to nonspecific interaction with mammalian cell membranes. In the present study, we report charge-neutralized variants of Sso7d that maintain high thermal stability...
October 21, 2016: Journal of Biological Chemistry
Ying Zhang, Ye Peng, Zhichao Bin, Huijie Wang, Haojie Lu
N-linked protein glycosylation is involved in regulation of a wide variety of cellular processes and associated with numerous diseases. Highly specific identification of N-glycome remains a challenge while its biological significance is acknowledged. The relatively low abundance of glycan in complex biological mixtures, lack of basic sites for protonation, and suppression by other highly abundant proteins/peptides lead to the particularly poor detection sensitivity of N-glycans in the MS analysis. Therefore, the highly specific purification procedure becomes a crucial step prior to MS analysis of the N-glycome...
August 31, 2016: Analytica Chimica Acta
Guangyan Qing, Xiuling Li, Peng Xiong, Cheng Chen, Mimi Zhan, Xinmiao Liang, Taolei Sun
Glycoproteomics identifies and catalogs protein glycosylation and explores its impact on protein conformations and biofunctions. However, these studies are restricted by the bottleneck to enrich low-abundance glycopeptides from complex biosamples and the difficulties in analyzing glycan structures by mass spectrometry. Here, we report dipeptide as a simple but promising carbohydrate binding platform to tackle these problems. We build a hydropathy-index-based strategy for sequence optimization and screen out three optimal dipeptide sequences from 54 types of dipeptides...
August 31, 2016: ACS Applied Materials & Interfaces
Md Kamal Hossain, Katherine A Wall
Aberrantly glycosylated mucin 1 (MUC1) is a recognized tumor-specific antigen on epithelial cell tumors. A wide variety of MUC1 glycopeptide anti-cancer vaccines have been formulated by many research groups. Some researchers have used MUC1 alone as an immunogen whereas other groups used different antigenic carrier proteins such as bovine serum albumin or keyhole limpet hemocyanin for conjugation with MUC1 glycopeptide. A variety of adjuvants have been used with MUC1 glycopeptides to improve their immunogenicity...
July 26, 2016: Vaccines
Funmilola Clara Thomas, William Mullen, Riccardo Tassi, Adela Ramírez-Torres, Manikhandan Mudaliar, Tom N McNeilly, Ruth N Zadoks, Richard Burchmore, P David Eckersall
A peptidomic investigation of milk from an experimental model of Streptococcus uberis mastitis in dairy cows has incorporated a study of milk high abundance and acute phase (APP) proteins as well as analysis of low molecular weight peptide biomarkers. Intramammary infection (IMI) with S. uberis caused a shift in abundance from caseins, β-lactoglobulin and α-lactalbumin to albumin, lactoferrin and IgG with the increase in lactoferrin occurring last. The APP response of haptoglobin, mammary associated serum amyloid A3 and C-reactive protein occurred between 30-48 hours post challenge with peak concentrations of APPs at 72-96 hours post challenge and declined thereafter at a rate resembling the fall in bacterial count rather than the somatic cell count...
August 16, 2016: Molecular BioSystems
Philip I Burgess, Simon P Harding, Marta García-Fiñana, Nicholas A V Beare, Gerald Msukwa, Theresa J Allain
PURPOSE: To describe the prevalence, incidence, and progression of retinopathy and to report associations with demographic, clinical, and biochemical variables in people with diabetes in Southern Malawi. DESIGN: Prospective cohort study. PARTICIPANTS: Subjects were systematically sampled from 2 primary care diabetes clinics. METHODS: We performed the first prospective cohort study of diabetic retinopathy from Sub-Saharan Africa over 24 months...
September 2016: Ophthalmology
Chenshu Huang, Shaolin Li
OBJECTIVE: To investigate the relationship between blood neutrophil lymphocyte ratio (NLR) and postmenopausal osteoporosis in Chinese women without diabetes. METHODS: Two hundred and thirty three postmenopausal women without diabetes were included in this study. The clinical data of patients including age, and body mass index (BMI) were recorded. Blood samples were obtained to determine Blood urea nitrogen (BUN), Uric acid (UA), Albumin (ALB), Creatinine (CREA), Total Cholesterol(TC), Triglyceride (TG), Fasting plasma glucose (FPG), Glycosylated Hemoglobin (HbAlc), 25-hydroxyitamin D (25-OHD) level...
May 2016: Pakistan Journal of Medical Sciences Quarterly
Soha M Abd El Dayem, Ahmed A Battah, Amal El Shehaby
AIM: To evaluate cardiac affection in type 1 diabetes in relation to Omentin. PATIENTS AND METHODS: Sixty two diabetics and 30 volunteer of the same age and sex were included as a control group. Blood sample was taken for assessment of omentin and oxidized low density lipoprotein (OxLDL), glycosylated hemoglobin (HbA1) and lipid profile. Urine sample was taken for assessment of albumin/creatinine ratio. 24 hour holter was also done. T-test, simple correlation followed by stepwise multiple regression analysis was used for analysis of data...
December 15, 2015: Open Access Macedonian Journal of Medical Sciences
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