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https://www.readbyqxmd.com/read/28900103/yeej-is-an-inverse-autotransporter-from-escherichia-coli-that-binds-to-peptidoglycan-and-promotes-biofilm-formation
#1
Marta Martinez-Gil, Kelvin G K Goh, Elze Rackaityte, Chizuko Sakamoto, Bianca Audrain, Danilo G Moriel, Makrina Totsika, Jean-Marc Ghigo, Mark A Schembri, Christophe Beloin
Escherichia coli is a commensal or pathogenic bacterium that can survive in diverse environments. Adhesion to surfaces is essential for E. coli colonization, and thus it is important to understand the molecular mechanisms that promote this process in different niches. Autotransporter proteins are a class of cell-surface factor used by E. coli for adherence. Here we characterized the regulation and function of YeeJ, a poorly studied but widespread representative from an emerging class of autotransporter proteins, the inverse autotransporters (IAT)...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28887782/development-of-acrodat-%C3%A2-a-new-software-medical-device-to-assess-disease-activity-in-patients-with-acromegaly
#2
Aart J van der Lely, Roy Gomez, Andreas Pleil, Xavier Badia, Thierry Brue, Michael Buchfelder, Pia Burman, David Clemmons, Ezio Ghigo, Jens Otto Lunde Jørgensen, Anton Luger, Joli van der Lans-Bussemaker, Susan M Webb, Christian J Strasburger
PURPOSE: Despite availability of multimodal treatment options for acromegaly, achievement of long-term disease control is suboptimal in a significant number of patients. Furthermore, disease control as defined by biochemical normalization may not always show concordance with disease-related symptoms or patient's perceived quality of life. We developed and validated a tool to measure disease activity in acromegaly to support decision-making in clinical practice. METHODS: An international expert panel (n = 10) convened to define the most critical indicators of disease activity...
September 8, 2017: Pituitary
https://www.readbyqxmd.com/read/28870484/higher-protein-intake-is-associated-with-improved-muscle-strength-in-elite-senior-athletes
#3
Filippo Giorgio Di Girolamo, Roberta Situlin, Nicola Fiotti, Marcello Tence, Paolo De Colle, Filippo Mearelli, Marco Alessandro Minetto, Ezio Ghigo, Massimo Pagani, Daniela Lucini, Fabio Pigozzi, Piero Portincasa, Gabriele Toigo, Gianni Biolo
OBJECTIVE: The optimal protein intake for elderly individuals who exercise regularly has not yet been clearly defined. The aim of this study was to test the hypothesis that protein intake level is associated with muscle strength in elderly elite athletes. METHODS: We evaluated 50 elite senior athletes (38 men and 12 women) participating in the European Master Games 2011 in an observational cross-sectional study. Participants were divided into two groups-lower (LPI) or higher (HPI) protein intake-according to the median value of their ratio of urinary urea nitrogen to urinary creatinine (i...
October 2017: Nutrition
https://www.readbyqxmd.com/read/28851936/putrescine-independent-wound-response-phenotype-is-produced-by-odc-like-rnai-in-planarians
#4
Lucia Cassella, Alessandra Salvetti, Paola Iacopetti, Chiara Ippolito, Claudio Ghezzani, Gregory Gimenez, Eric Ghigo, Leonardo Rossi
Despite increasing evidence indicates polyamines as a convergence point for signaling pathways, including cell growth and differentiation, a unifying concept to interpret their role is still missing. The activity of ornithine decarboxylase (ODC), the rate-limiting enzyme in polyamine biosynthesis, is tightly regulated by a complex molecular machinery, and the demonstration of the existence of multiple ODC paralogs, lacking decarboxylation activity, suggests additional layers of complexity to the intricate ODC regulatory pathway...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28801243/peroxiredoxin-2-plays-a-pivotal-role-as-multimodal-cytoprotector-in-the-early-phase-of-pulmonary-hypertension
#5
Enrica Federti, Alessandro Matté, Alessandra Ghigo, Immacolata Andolfo, Cimino James, Angela Siciliano, Christophe Leboeuf, Anne Janin, Francesco Manna, Soo Young Choi, Achille Iolascon, Elisabetta Beneduce, Davide Melisi, Dae Won Kim, Sonia Levi, Lucia De Franceschi
Pulmonary-artery-hypertension (PAH) is a life-threatening and highly invalidating chronic disorder. Chronic oxidation contributes to lung damage and disease progression. Peroxiredoxin-2 (Prx2) is a typical 2-cysteine (Cys) peroxiredoxin but its role on lung homeostasis is yet to be fully defined. Here, we showed that Prx2(-/-) mice displayed chronic lung inflammatory disease associated with (i) abnormal pulmonary vascular dysfunction; and (ii) increased markers of extracellular-matrix remodeling. Hypoxia was used to induce PAH...
August 9, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28801233/t-cell-zone-resident-macrophages-silently-dispose-of-apoptotic-cells-in-the-lymph-node
#6
Myriam Baratin, Léa Simon, Audrey Jorquera, Clément Ghigo, Doulaye Dembele, Jonathan Nowak, Rebecca Gentek, Stephan Wienert, Frederick Klauschen, Bernard Malissen, Marc Dalod, Marc Bajénoff
In lymph nodes (LNs), dendritic cells (DCs) are thought to dispose of apoptotic cells, a function pertaining to macrophages in other tissues. We found that a population of CX3CR1(+) MERTK(+) cells located in the T cell zone of LNs, previously identified as DCs, are efferocytic macrophages. Lineage-tracing experiments and shield chimeras indicated that these T zone macrophages (TZM) are long-lived macrophages seeded in utero and slowly replaced by blood monocytes after birth. Imaging the LNs of mice in which TZM and DCs express different fluorescent proteins revealed that TZM-and not DCs-act as the only professional scavengers, clearing apoptotic cells in the LN T cell zone in a CX3CR1-dependent manner...
August 15, 2017: Immunity
https://www.readbyqxmd.com/read/28754382/recent-advances-in-studying-single-bacteria-and-biofilm-mechanics
#7
REVIEW
Catherine Even, Christian Marlière, Jean-Marc Ghigo, Jean-Marc Allain, Alba Marcellan, Eric Raspaud
Bacterial biofilms correspond to surface-associated bacterial communities embedded in hydrogel-like matrix, in which high cell density, reduced diffusion and physico-chemical heterogeneity play a protective role and induce novel behaviors. In this review, we present recent advances on the understanding of how bacterial mechanical properties, from single cell to high-cell density community, determine biofilm tri-dimensional growth and eventual dispersion and we attempt to draw a parallel between these properties and the mechanical properties of other well-studied hydrogels and living systems...
July 21, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28729453/pi3k-and-calcium-signaling-in-cardiovascular-disease
#8
REVIEW
Alessandra Ghigo, Muriel Laffargue, Mingchuan Li, Emilio Hirsch
Receptor signaling relays on intracellular events amplified by secondary and tertiary messenger molecules. In cardiomyocytes and smooth muscle cells, cyclic AMP (cAMP) and subsequent calcium (Ca(2+)) fluxes are the best characterized receptor-regulated signaling events. However, most of receptors able to modify contractility and other intracellular responses signal through a variety of other messengers, and whether these signaling events are interconnected has long remained unclear. For example, the PI3K (phosphoinositide 3-kinase) pathway connected to the production of the lipid second messenger PIP3/PtdIns(3,4,5)P3 (phosphatidylinositol (3,4,5)-trisphosphate) is potentially involved in metabolic regulation, activation of hypertrophy, and survival pathways...
July 21, 2017: Circulation Research
https://www.readbyqxmd.com/read/28654509/pi3ks-in-diabetic-cardiomyopathy
#9
Mingchuan Li, Alessandra Murabito, Alessandra Ghigo, Emilio Hirsch
Diabetic cardiomyopathy is a heart disease in diabetic patients, identified as ventricular dysfunction in the absence of coronary artery disease and hypertension. The molecular mechanisms underlying diabetic cardiomyopathy are still poorly understood. The protein and lipid kinase phosphoinositide 3-kinases (PI3Ks) have been suggested to regulate cardiac injury during diabetes. In this review, we will summarize the role of different PI3K isoforms and of their downstream signaling in the pathogenesis of diabetic cardiomyopathy, including the regulation of cardiac metabolism, contractility, hypertrophy, myocardial cell death and inflammation...
June 22, 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28617451/biological-and-chemical-strategies-for-exploring-inter-and-intra-kingdom-communication-mediated-via-bacterial-volatile-signals
#10
Mohamed A Farag, Geun Cheol Song, Yong-Soon Park, Bianca Audrain, Soohyun Lee, Jean-Marc Ghigo, Joseph W Kloepper, Choong-Min Ryu
Airborne chemical signals emitted by bacteria influence the behavior of other bacteria and plants. We present an overview of in vitro methods for evaluating bacterial and plant responses to bacterial volatile compounds (BVCs). Three types of equipment have been used to physically separate the bacterial test strains from either other bacterial strains or plants (in our laboratory we use either Arabidopsis or tobacco plant seedlings): a Petri dish containing two compartments (BI Petri dish); two Petri dishes connected with tubing; and a microtiter-based assay...
July 2017: Nature Protocols
https://www.readbyqxmd.com/read/28581446/tregs-restrain-dendritic-cell-autophagy-to-ameliorate-autoimmunity
#11
Themis Alissafi, Aggelos Banos, Louis Boon, Tim Sparwasser, Alessandra Ghigo, Kajsa Wing, Dimitrios Vassilopoulos, Dimitrios Boumpas, Triantafyllos Chavakis, Ken Cadwell, Panayotis Verginis
Design of efficacious Treg-based therapies and establishment of clinical tolerance in autoimmune diseases have proven to be challenging. The clinical implementation of Treg immunotherapy has been hampered by various impediments related to the stability and isolation procedures of Tregs as well as the specific in vivo targets of Treg modalities. Herein, we have demonstrated that Foxp3+ Tregs potently suppress autoimmune responses in vivo through inhibition of the autophagic machinery in DCs in a cytotoxic T-lymphocyte-associated protein 4-dependent (CTLA4-dependent) manner...
June 30, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28560284/data-demonstrating-the-anti-oxidant-role-of-hemopexin-in-the-heart
#12
Giada Ingoglia, Can Martin Sag, Nikolai Rex, Lucia De Franceschi, Francesca Vinchi, James Cimino, Sara Petrillo, Stefan Wagner, Klaus Kreitmeier, Lorenzo Silengo, Fiorella Altruda, Lars S Maier, Emilio Hirsch, Alessandra Ghigo, Emanuela Tolosano
The data presented in this article are related to the research article entitled Hemopexin counteracts systolic dysfunction induced by heme-driven oxidative stress (G. Ingoglia, C. M. Sag, N. Rex, L. De Franceschi, F. Vinchi, J. Cimino, S. Petrillo, S. Wagner, K. Kreitmeier, L. Silengo, F. Altruda, L. S. Maier, E. Hirsch, A. Ghigo and E. Tolosano, 2017) [1]. Data show that heme induces reactive oxygen species (ROS) production in primary cardiomyocytes. H9c2 myoblastic cells treated with heme bound to human Hemopexin (Hx) are protected from heme accumulation and oxidative stress...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28542503/biofilm-microenvironment-induces-a-widespread-adaptive-amino-acid-fermentation-pathway-conferring-strong-fitness-advantage-in-escherichia-coli
#13
Sylvie Létoffé, Sabina Chalabaev, José Dugay, Franziska Stressmann, Bianca Audrain, Jean-Charles Portais, Fabien Letisse, Jean-Marc Ghigo
Bacterial metabolism has been studied primarily in liquid cultures, and exploration of other natural growth conditions may reveal new aspects of bacterial biology. Here, we investigate metabolic changes occurring when Escherichia coli grows as surface-attached biofilms, a common but still poorly characterized bacterial lifestyle. We show that E. coli adapts to hypoxic conditions prevailing within biofilms by reducing the amino acid threonine into 1-propanol, an important industrial commodity not known to be naturally produced by Enterobacteriaceae...
May 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28456423/staphylococcus-aureus-promotes-smed-pgrp-2-smed-setd8-1-methyltransferase-signalling-in-planarian-neoblasts-to-sensitize-anti-bacterial-gene-responses-during-re-infection
#14
Cedric Torre, Prasad Abnave, Landry Laure Tsoumtsa, Giovanna Mottola, Catherine Lepolard, Virginie Trouplin, Gregory Gimenez, Julie Desrousseaux, Stephanie Gempp, Anthony Levasseur, Laetitia Padovani, Emmanuel Lemichez, Eric Ghigo
Little is known about how organisms exposed to recurrent infections adapt their innate immune responses. Here, we report that planarians display a form of instructed immunity to primo-infection by Staphylococcus aureus that consists of a transient state of heightened resistance to re-infection that persists for approximately 30days after primo-infection. We established the involvement of stem cell-like neoblasts in this instructed immunity using the complementary approaches of RNA-interference-mediated cell depletion and tissue grafting-mediated gain of function...
June 2017: EBioMedicine
https://www.readbyqxmd.com/read/28455708/macrophages-in-invertebrates-from-insects-and-crustaceans-to-marine-bivalves
#15
REVIEW
Prasad Abnave, Xavier Muracciole, Eric Ghigo
Macrophages are critical components of the antimicrobial response. The recent explosion of knowledge on the evolutionary, genetic, and biochemical aspects of the interaction between macrophages and microbes has renewed scientific interest in macrophages. The conservation of immune components or mechanisms between organisms during the evolutionary process allows us to elucidate antimicrobial mechanisms or discover new immune functions through the study of basal-branching organisms, such as invertebrates. As a result, immunity in non-vertebrates has attracted the attention of researchers in the last few decades...
2017: Results and Problems in Cell Differentiation
https://www.readbyqxmd.com/read/28451983/therapeutic-targeting-of-pdes-and-pi3k-in-heart-failure-with-preserved-ejection-fraction-hfpef
#16
REVIEW
Valentina Sala, Jean Piero Margaria, Alessandra Murabito, Fulvio Morello, Alessandra Ghigo, Emilio Hirsch
PURPOSE OF REVIEW: Heart Failure with preserved Ejection Fraction (HFpEF) is a prevalent disease with considerable individual and societal burden. HFpEF patients often suffer from multiple pathological conditions thatcomplicate management and adversely affect outcome, including pulmonary hypertension and chronic obstructive pulmonary disease (COPD). To date, no treatment proved to be fully effective in reducing morbidity and mortality in HFpEF, possibly due to an incomplete understanding of the underlying molecular mechanisms...
June 2017: Current Heart Failure Reports
https://www.readbyqxmd.com/read/28419317/high-dose-and-high-frequency-lanreotide-autogel-in-acromegaly-a-randomized-multicenter-study
#17
Andrea Giustina, Gherardo Mazziotti, Salvatore Cannavò, Roberto Castello, Giorgio Arnaldi, Giovanna Bugari, Renato Cozzi, Diego Ferone, Anna Maria Formenti, Enza Gatti, Silvia Grottoli, Pietro Maffei, Filippo Maffezzoni, Marcella Montini, Massimo Terzolo, Ezio Ghigo
Context: Increase in drug frequency or dose is recommended for acromegaly patients with partial response to long-acting somatostatin receptor ligands (SRLs). However, the efficacy and safety data with lanreotide (LAN) Autogel (LAN-ATG) at high dose (HD) or high frequency (HF) are still scanty. Objective: To evaluate the biochemical efficacy and safety of HF and HD LAN-ATG in patients with active acromegaly. Design: Twenty-four-week prospective, multicenter, randomized, open-label trial...
July 1, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28400318/hemopexin-counteracts-systolic-dysfunction-induced-by-heme-driven-oxidative-stress
#18
Giada Ingoglia, Can Martin Sag, Nikolai Rex, Lucia De Franceschi, Francesca Vinchi, James Cimino, Sara Petrillo, Stefan Wagner, Klaus Kreitmeier, Lorenzo Silengo, Fiorella Altruda, Lars S Maier, Emilio Hirsch, Alessandra Ghigo, Emanuela Tolosano
Heart failure is a leading cause of morbidity and mortality in patients affected by different disorders associated to intravascular hemolysis. The leading factor is the presence of pathologic amount of pro-oxidant free heme in the bloodstream, due to the exhaustion of the natural heme scavenger Hemopexin (Hx). Here, we evaluated whether free heme directly affects cardiac function, and tested the therapeutic potential of replenishing serum Hx for increasing serum heme buffering capacity. The effect of heme on cardiac function was assessed in vitro, on primary cardiomyocytes and H9c2 myoblast cell line, and in vivo, in Hx(-/-) mice and in genetic and acquired mouse models of intravascular hemolysis...
April 8, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28343317/do-glucocorticoids-induce-addiction-in-humans
#19
R Giordano, F Guaraldi, M Mazzoli, E Ghigo
No abstract text is available yet for this article.
August 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28292655/a-one-dimensional-arterial-network-model-for-bypass-graft-assessment
#20
A R Ghigo, S Abou Taam, X Wang, P-Y Lagrée, J-M Fullana
We propose an arterial network model based on one-dimensional hemodynamic equations to study the behavior of different vascular surgical bypass grafts in the case of an arterial occlusive pathology: a stenosis of the Right Iliac artery. We investigate the performances of three different bypass grafts (Aorto-Femoral, Axillo-Femoral and cross-over Femoral) depending on the degree of obstruction of the stenosis. Numerical simulations show that all bypass grafts are efficient since we retrieve in each case the healthy hemodynamics downstream of the stenosed region while ensuring at the same time a global healthy circulation...
March 11, 2017: Medical Engineering & Physics
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