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https://www.readbyqxmd.com/read/29352525/an-mrm-based-cytokeratin-marker-assay-as-a-tool-for-cancer-studies-application-to-lung-cancer-pleural-effusions
#1
Anna Perzanowska, Agnieszka Fatalska, Grzegorz Wojtas, Andrzej Lewandowicz, Agata Michalak, Grzegorz Krasowski, Christoph H Borchers, Michal Dadlez, Dominik Domanski
PURPOSE: The goal of this work was to develop an LC-MRM assay for the quantitative analysis of a set of established and diagnostically important cytokeratin (CK) markers used in cancer diagnosis, prognosis and therapy monitoring. Secondly, the potential of this assay in lung cancer diagnosis through pleural effusion (PE) analysis was examined. EXPERIMENTAL DESIGN: A multiplexed MRM assay was developed for 17 CKs and their select caspase-cleaved fragments. Isotope-labeled standard peptides were used for high assay specificity and absolute peptide quantitation; with robust standard-flow LC coupled to a latest-generation triple-quadrupole instrument for high sensitivity...
January 19, 2018: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/29352508/inhibition-of-brd4-attenuates-cardiomyocyte-apoptosis-via-nf-%C3%AE%C2%BAb-pathway-in-a-rat-model-of-myocardial-infarction
#2
Yiping Sun, Ying Xie, Luping Du, Jingwu Sun, Zhiqiang Liu
Myocardial infarction (MI) remains the most common cause of heart failure (HF) worldwide. For almost 50 years, HF has been recognized as a determinant of adverse prognosis after MI, but efforts to promote myocardial repair have failed to be translated into clinical therapies. In the present study, we investigated the effects of BRD4 on cardiac function and the underlying mechanism. We found that BRD4 protein expression was significantly increased in cardiomyocytes of MI rat model and cardiomyocytes under hypoxia, accompanied by the expression of natriuretic peptide A (NPPA) and natriuretic peptide B (NPPB)...
January 20, 2018: Cardiovascular Therapeutics
https://www.readbyqxmd.com/read/29352484/melatonin-ameliorates-a%C3%AE-42-induced-alteration-of-%C3%AE-app-processing-secretases-via-the-melatonin-receptor-through-the-pin1-gsk3%C3%AE-nf-%C3%AE%C2%BAb-pathway-in-sh-sy5y-cells
#3
Vorapin Chinchalongporn, Mayuri Shukla, Piyarat Govitrapong
Melatonin is involved in the physiological regulation of the β- amyloid precursor protein (βAPP) cleaving secretases which are responsible for generation of the neurotoxic amyloid beta (Aβ) peptide, one of the hallmarks of Alzheimer's disease (AD) pathology. In this study, we aimed to determine the underlying mechanisms of this regulation under pathological conditions. We establish that melatonin prevents Aβ42 -induced down-regulation of a disintegrin and metalloproteinase domain-containing protein 10 (ADAM10) as well as up-regulation of β-site APP-cleaving enzyme 1 (BACE1) and presenilin 1 (PS1) in SH-SY5Y cell cultures...
January 20, 2018: Journal of Pineal Research
https://www.readbyqxmd.com/read/29352443/baculovirus-based-gene-silencing-of-humanin-for-the-treatment-of-pituitary-tumors
#4
María Florencia Gottardo, Matías L Pidre, Camila Zuccato, Antonela S Asad, Mercedes Imsen, Gabriela Jaita, Marianela Candolfi, Víctor Romanowski, Adriana Seilicovich
Pituitary tumors are the most common primary intracranial neoplasms. Humanin (HN) and Rattin (HNr), a rat homolog of HN, are short peptides with a cytoprotective action. In the present study, we aimed to evaluate whether endogenous HNr plays an antiapoptotic role in pituitary tumor cells. Thus, we used RNA interference based on short-hairpin RNA (shRNA) targeted to HNr (shHNr). A plasmid including the coding sequences for shHNr and dTomato fluorescent reporter gene was developed (pUC-shHNr). Transfection of somatolactotrope GH3 cells with pUC-shHNr increased apoptosis, suggesting that endogenous HNr plays a cytoprotective role in pituitary tumor cells...
January 19, 2018: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/29352409/recent-perspectives-on-the-molecular-basis-of-biofilm-formation-by-pseudomonas-aeruginosa-and-approaches-for-treatment-and-biofilm-dispersal
#5
REVIEW
Sinosh Skariyachan, Vaishnavi Sneha Sridhar, Swathi Packirisamy, Supreetha Toplar Kumargowda, Sneha Basavaraj Challapilli
Pseudomonas aeruginosa, a Gram-negative, rod-shaped bacterium causes widespread diseases in humans. This bacterium is frequently related to nosocomial infections such as pneumonia, urinary tract infections (UTIs) and bacteriaemia especially in immunocompromised patients. The current review focuses on the recent perspectives on biofilms formation by these bacteria. Biofilms are communities of microorganisms in which cells stick to each other and often adhere to a surface. These adherent cells are usually embedded within a self-produced matrix of extracellular polymeric substance (EPS)...
January 19, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29352349/factors-affecting-n-terminal-pro-b-type-natriuretic-peptide-levels-in-preterm-infants-and-use-in-determination-of-haemodynamic-significance-of-patent-ductus-arteriosus
#6
Sarah Louise Harris, Kiran More, Bronwyn Dixon, Richard Troughton, Chris Pemberton, John Horwood, Nicola Ellis, Nicola Austin
This study aimed to investigate factors affecting N-terminal pro-B-type natriuretic peptide (NTproBNP) in preterm infants and the ability of NTproBNP to predict haemodynamically significant patent ductus arteriosus (HsPDA). Prospective cohort study of 51 infants < 30 weeks gestation. Blood NTproBNP and heart ultrasound were performed on day of life 3, 10, 28 and 36 weeks corrected age. NTproBNP levels analysed for prediction of HsPDA. The effect of gestational age, ventilation, hypoxia, bronchopulmonary dysplasia (BPD), creatinine and haemoglobin levels on NTproBNP levels were investigated...
January 19, 2018: European Journal of Pediatrics
https://www.readbyqxmd.com/read/29352321/inflammatory-linked-changes-in-cpg-island-methylation-of-three-opioid-peptide-genes-in-a-rat-model-for-pain
#7
Charlotte Louise Justine Jacobi, Christoph Stein
Expression of the opioid peptide genes proopiomelanocortin (Pomc), proenkephalin (Penk), and prodynorphin (Pdyn), in immune cells plays a key role in endogenous pain control. In a rat model of painful unilateral paw inflammation, we isolated cells from popliteal lymph nodes and evaluated the role of CpG island C5-methylation on the transcriptional activation of those genes. Using methylated DNA immunoprecipitation, we sorted gDNA into methylated (me) and non-me fractions and then determined the CpG island methylation status of each fraction via quantitative Real Time-PCR (qRT-PCR)...
2018: PloS One
https://www.readbyqxmd.com/read/29352262/microbial-regulation-of-the-l-cell-transcriptome
#8
Tulika Arora, Rozita Akrami, Ramona Pais, Linda Bergqvist, Bengt R Johansson, Thue W Schwartz, Frank Reimann, Fiona M Gribble, Fredrik Bäckhed
L cells are an important class of enteroendocrine cells secreting hormones such as glucagon like peptide-1 and peptide YY that have several metabolic and physiological effects. The gut is home to trillions of bacteria affecting host physiology, but there has been limited understanding about how the microbiota affects gene expression in L cells. Thus, we rederived the reporter mouse strain, GLU-Venus expressing yellow fluorescent protein under the control of the proglucagon gene, as germ-free (GF). Lpos cells from ileum and colon of GF and conventionally raised (CONV-R) GLU-Venus mice were isolated and subjected to transcriptomic profiling...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352252/towards-an-experimental-classification-system-for-membrane-active-peptides
#9
G D Brand, M H S Ramada, T C Genaro-Mattos, C Bloch
Mature proteins can act as potential sources of encrypted bioactive peptides that, once released from their parent proteins, might interact with diverse biomolecular targets. In recent work we introduced a systematic methodology to uncover encrypted intragenic antimicrobial peptides (IAPs) within large protein sequence libraries. Given that such peptides may interact with membranes in different ways, resulting in distinct observable outcomes, it is desirable to develop a predictive methodology to categorize membrane active peptides and establish a link to their physicochemical properties...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352146/effects-of-renal-denervation-on-cardiac-structural-and-functional-abnormalities-in-patients-with-resistant-hypertension-or-diastolic-dysfunction
#10
Shiying Wang, Suxia Yang, Xinxin Zhao, Jun Shi
The aim of the present study is to systematically evaluate the impact of RDN on cardiac structure and function in patients with resistant hypertension (RH) or diastolic dysfunction. We retrieved Pubmed, Embase and Cocharane Library databases, from inception to April 1st, 2016. Studies reporting left ventricular mass (LVMI) or left ventricular (LV) diastolic function (reflected by the ratio of mitral inflow velocity to annular relaxation velocity [E/e']) responses to RDN were included. Two randomized controlled trials (RCTs), 3 controlled studies and 11 uncontrolled studies were finally identified...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352128/phosphorylation-of-the-transient-receptor-potential-ankyrin-1-by-cyclin-dependent-kinase-5-affects-chemo-nociception
#11
Bradford E Hall, Michaela Prochazkova, Matthew R Sapio, Paul Minetos, Natalya Kurochkina, B K Binukumar, Niranjana D Amin, Anita Terse, John Joseph, Stephen J Raithel, Andrew J Mannes, Harish C Pant, Man-Kyo Chung, Michael J Iadarola, Ashok B Kulkarni
Cyclin-dependent kinase 5 (Cdk5) is a key neuronal kinase that is upregulated during inflammation, and can subsequently modulate sensitivity to nociceptive stimuli. We conducted an in silico screen for Cdk5 phosphorylation sites within proteins whose expression was enriched in nociceptors and identified the chemo-responsive ion channel Transient Receptor Potential Ankyrin 1 (TRPA1) as a possible Cdk5 substrate. Immunoprecipitated full length TRPA1 was shown to be phosphorylated by Cdk5 and this interaction was blocked by TFP5, an inhibitor that prevents activation of Cdk5...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352090/production-of-ophthalmic-acid-using-engineered-escherichia-coli
#12
Tomokazu Ito, Maiko Tokoro, Ran Hori, Hisashi Hemmi, Tohru Yoshimura
Ophthalmic acid (l-γ-glutamyl-l-2-aminobutyryl-glycine, OA) is an analog of glutathione (l-γ-glutamyl-l-cysteinyl-glycine, GSH) in which the cysteine moiety is replaced by l-2-aminobutyrate. OA is a useful peptide for the pharmaceutical and/or food industries. Herein, we report a method for the production of OA using engineered Escherichia coli cells. The yggS-deficient E. coli cells, which lack the highly conserved pyridoxal 5' -phosphate-binding protein YggS and naturally accumulate OA, were selected as the starting strain background...
January 19, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29352089/cryptic-production-of-trans-3-hydroxyproline-in-echinocandin-b-biosynthesis
#13
Johanna Mattay, Stefanie Houwaart, Wolfgang Hüttel
Echinocandins are antifungal nonribosomal hexapeptides produced by fungi. Two of the amino acids are hydroxy-l-prolines: trans-4-hydroxy-l-proline and, in most echinocandin structures, (trans-2,3)-3-hydroxy-(trans-2,4)-4-methyl-l-proline. In the case of echinocandin biosynthesis by Glarea lozoyensis, both amino acids are found in pneumocandin A0, while in pneumocandin B0 the latter residue is substituted by trans-3- hydroxy-l-proline (3-Hyp). We have recently reported that all three amino acids are generated by the 2-oxoglutarate-dependent proline hydroxylase GloF...
January 19, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29352002/intestinal-epithelial-cell-derived-lkb1-suppresses-colitogenic-microbiota
#14
Xia'nan Liu, Jinfeng Lu, Zhenshan Liu, Junjie Zhao, Hongxiang Sun, Ningbo Wu, Hongzhi Liu, Weiwei Liu, Zhuqin Hu, Guangxun Meng, Lei Shen, Aaron W Miller, Bing Su, Xiaoxia Li, Zizhen Kang
Dysregulation of the immune barrier function of the intestinal epithelium can often result in dysbiosis. In this study we report a novel role of intestinal epithelial cell (IEC) -derived liver kinase B1 (LKB1) in suppressing colitogenic microbiota. IEC-specific deletion of LKB1 (LKB1ΔIEC) resulted in an increased susceptibility to dextran sodium sulfate (DSS)-induced colitis and a definitive shift in the composition of the microbial population in the mouse intestine. Importantly, transfer of the microbiota from LKB1ΔIEC mice was sufficient to confer increased susceptibility to DSS-induced colitis in wild-type recipient mice...
January 19, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29351798/comparative-salivary-proteomics-analysis-of-children-with-and-without-dental-caries-using-the-itraq-mrm-approach
#15
Kun Wang, Yufei Wang, Xiuqing Wang, Qian Ren, Sili Han, Longjiang Ding, Zhongcheng Li, Xuedong Zhou, Wei Li, Linglin Zhang
BACKGROUND: Dental caries is a major worldwide oral disease afflicting a large proportion of children. As an important host factor of caries susceptibility, saliva plays a significant role in the occurrence and development of caries. The aim of the present study was to characterize the healthy and cariogenic salivary proteome and determine the changes in salivary protein expression of children with varying degrees of active caries, also to establish salivary proteome profiles with a potential therapeutic use against dental caries...
January 19, 2018: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29351722/evaluation-of-matrix-effects-on-tof-sims-data-of-leu-enkephalin-and-1-2-dioleoyl-sn-glycero-3-phosphocholine-mixed-samples
#16
Shusuke Nakano, Takayuki Yamagishi, Satoka Aoyagi, André Portz, Michael Dürr, Hideo Iwai, Tomoko Kawashima
Time-of-flight secondary ion mass spectrometry (TOF-SIMS) is one of the most powerful methods to analyze biomolecules in biological tissues and cells because it provides detailed chemical structure information and chemical images with a high spatial resolution. However, in terms of quantitative analysis, there are issues such as matrix effects that often cause secondary ion intensity changes regardless of the actual concentration in a sample. For instance, the intensity of secondary ions related to peptides is generally suppressed when lipids coexist...
January 19, 2018: Biointerphases
https://www.readbyqxmd.com/read/29351720/structural-interconversion-in-alzheimer-s-amyloid-%C3%AE-16-35-peptide-in-an-aqueous-solution
#17
Nelson Alves, Rafael B Frigori
Structural properties of Aβ(16-35) fragment are investigated as a model for the amyloid-β peptide excluding its coil-inducing terminals. Our Replica-Exchange Molecular Dynamics simulations using all-atoms and explicit aqueous solvation widely reduce any structural bias. The principal folding pathway shows direct conversion of coil to β-sheet, without the long proposed helix intermediates. Our PCA analysis indicates that the fragment is also intrinsically disordered, as the full amyloid-β peptide. Thus, the observed folding mechanism lacks free-energy barriers and any peaks in the thermal capacity...
January 19, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29351622/antimicrobial-peptide-resistance-mechanism-contributes-to-staphylococcus-aureus-infection
#18
Gordon Y C Cheung, Emilie L Fisher, Joshua W McCausland, Justin Choi, John W M Collins, Seth W Dickey, Michael Otto
Antimicrobial peptides (AMPs) constitute an important part of innate host defense. Possibly limiting the therapeutic potential of AMPs is the fact that bacteria have developed AMP resistance mechanisms during their co-evolution with humans. However, there is no direct evidence that AMP resistance per se is important during an infection. Here we show that the Staphylococcus aureus Pmt ABC transporter defends the bacteria from killing by important human AMPs and elimination by human neutrophils. By showing that Pmt contributes to virulence during skin infection in an AMP-dependent manner, we provide evidence that AMP resistance plays a key role in bacterial infection...
January 17, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29351487/contribution-of-parasympathetic-muscarinic-augmentation-of-insulin-secretion-to-olanzapine-induced-hyperinsulinemia
#19
Michael R Rickels, Elys M Perez, Amy J Peleckis, Erica Alshehabi, Huong-Lan Nguyen, Darko Stefanovski, Karl Rickels, Karen L Teff
Atypical antipsychotic drugs have been associated with the development of obesity and diabetes. In particular, olanzapine can induce peripheral insulin resistance and compensatory hyperinsulinemia independent of weight gain or psychiatric disease. To determine if this compensatory increase in insulin is mediated by parasympathetic muscarinic stimulation, we randomized fifteen healthy subjects 2:1 to receive double-blind olanzapine or placebo for 9 days under diet and activity controlled inpatient conditions...
December 19, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351476/human-endoc-%C3%AE-h1-%C3%AE-cells-form-pseudoislets-with-improved-glucose-sensitivity-and-enhanced-glp-1-signaling-in-the-presence-of-islet-derived-endothelial-cells
#20
Michael G Spelios, Lauren A Afinowicz, Regine C Tipon, Eitan M Akirav
Three-dimensional (3D) pseudoislets (PIs) can be used for the study of insulin-producing β-cells in free-floating islet-like structures similar to that of primary islets. Previously, we demonstrated the ability of islet-derived endothelial cells (iECs) to induce PIs using murine insulinomas, where PI formation enhanced insulin production and glucose responsiveness. In this report, we examined the ability of iECs to spontaneously induce the formation of free-floating 3D PIs using the EndoC-βH1 human β-cell line murine MS1 iEC line...
January 16, 2018: American Journal of Physiology. Endocrinology and Metabolism
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