scholarly journals Insulin immuno-neutralization in fed chickens: effects on liver and muscle transcriptome

2012 ◽  
Vol 44 (5) ◽  
pp. 283-292 ◽  
Author(s):  
Jean Simon ◽  
Dragan Milenkovic ◽  
Estelle Godet ◽  
Cedric Cabau ◽  
Anne Collin ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Metabolic Pathways ◽  
Transcriptional Control ◽  
Future Studies ◽  
False Discovery ◽  
Chicken Muscle ◽  
Resistance State ◽  
Insight Into

Chickens mimic an insulin-resistance state by exhibiting several peculiarities with regard to plasma glucose level and its control by insulin. To gain insight into the role of insulin in the control of chicken transcriptome, liver and leg muscle transcriptomes were compared in fed controls and “diabetic” chickens, at 5 h after insulin immuno-neutralization, using 20.7K-chicken oligo-microarrays. At a level of false discovery rate <0.01, 1,573 and 1,225 signals were significantly modified by insulin privation in liver and muscle, respectively. Microarray data agreed reasonably well with qRT-PCR and some protein level measurements. Differentially expressed mRNAs with human ID were classified using Biorag analysis and Ingenuity Pathway Analysis. Multiple metabolic pathways, structural proteins, transporters and proteins of intracellular trafficking, major signaling pathways, and elements of the transcriptional control machinery were largely represented in both tissues. At least 42 mRNAs have already been associated with diabetes, insulin resistance, obesity, energy expenditure, or identified as sensors of metabolism in mice or humans. The contribution of the pathways presently identified to chicken physiology (particularly those not yet related to insulin) needs to be evaluated in future studies. Other challenges include the characterization of “unknown” mRNAs and the identification of the steps or networks, which disturbed tissue transcriptome so extensively, quickly after the turning off of the insulin signal. In conclusion, pleiotropic effects of insulin in chickens are further evidenced; major pathways controlled by insulin in mammals have been conserved despite the presence of unique features of insulin signaling in chicken muscle.

scholarly journals cAMP metabolism controls caspase-11 inflammasome activation and pyroptosis in sepsis

2019 ◽  
Vol 5 (5) ◽  
pp. eaav5562 ◽  
Author(s):  
Ruochan Chen ◽  
Ling Zeng ◽  
Shan Zhu ◽  
Jiao Liu ◽  
Herbert J. Zeh ◽  
...  
Keyword(s):  
Metabolic Pathways ◽  
Inflammatory Responses ◽  
Poly I:C ◽  
Inflammasome Activation ◽  
Proof Of Concept ◽  
Potential Therapeutic Target ◽  
Camp Metabolism ◽  
Camp Hydrolysis ◽  
Insight Into

The ability of cytosolic lipopolysaccharide (LPS) to activate caspase-11–dependent nonclassical inflammasome is intricately controlled to avoid excessive inflammatory responses. However, very little is known about the regulatory role of various metabolic pathways in the control of caspase-11 activation. Here, we demonstrate that l-adrenaline can act on receptor ADRA2B to inhibit the activation of the caspase-11 inflammasome by cytosolic LPS or Escherichia coli infection in macrophages. l-adrenaline–induced cAMP production via the enzyme ADCY4 promotes protein kinase A (PKA) activation, which then blocks the caspase-11–mediated proteolytic maturation of interleukin-1β, gasdermin D (GSDMD) cleavage, and consequent DAMP release. Inhibition of PDE8A-mediated cAMP hydrolysis limits caspase-11 inflammasome activation and pyroptosis in macrophages. Consequently, pharmacological modulation of the ADRA2B-ADCY4-PDE8A-PKA axis, knockout of caspase-11 (Casp11−/−), or Gsdmd inactivation (GsdmdI105N/I105N) similarly protects against LPS-induced lethality in poly(I:C)-primed mice. Our results provide previously unidentified mechanistic insight into immune regulation by cAMP and represent a proof of concept that immunometabolism constitutes a potential therapeutic target in sepsis.

Morphometric and molecular characterization of an expanding Ionian population of the fireworm Hermodice carunculata (Annelida)

2019 ◽  
Vol 99 (7) ◽  
pp. 1569-1577 ◽  
Author(s):  
Sara Righi ◽  
Isabella Maletti ◽  
Ferruccio Maltagliati ◽  
Alberto Castelli ◽  
Michele Barbieri ◽  
...  
Keyword(s):  
Demographic History ◽  
Generalist Predator ◽  
Future Studies ◽  
Mitochondrial Coi ◽  
Hermodice Carunculata ◽  
Scuba Divers ◽  
History Analysis ◽  
Individual Size ◽  
Insight Into

AbstractThe amphinomid fireworm Hermodice carunculata is a potentially invasive species reported throughout the subtropical Atlantic Ocean and the Mediterranean Sea, which is known as a generalist predator and opportunistic feeder. The ongoing climate changes and seawater warming may favour fireworm poleward range expansions and density increases. Our results provide the first investigation into a population which has purportedly been spreading widely in the Salento Peninsula (Apulia, Italy). The specimens were analysed using allometric variables and molecular markers. The best morphometric parameters to estimate individual size were determined as key information for future studies on fireworm population dynamics. To phylogeographically characterize the Apulian population, sequences of the mitochondrial COI and 16S rDNA regions were obtained from a pool of individuals and treated together with those of Atlantic specimens retrieved from GenBank. The estimates of genetic variability for Apulian population were consistent with those recently reported in the literature. Inferences on demographic history analysis confirmed a recent expansion event in Apulia, as has been recounted by fishermen and scuba divers during recent years. Overall, these results constitute a crucial step in the characterization of present-day H. carunculata populations, and provide greater insight into fireworm population ecology.

Histolocalization and physico-chemical characterization of dihydrochalcones: Insight into the role of apple major flavonoids

2013 ◽  
Vol 90 ◽  
pp. 78-89 ◽  
Author(s):  
Matthieu Gaucher ◽  
Thomas Dugé de Bernonville ◽  
David Lohou ◽  
Sylvain Guyot ◽  
Thomas Guillemette ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Physico Chemical ◽  
Insight Into

scholarly journals Characterization of Three Small Proteins inBrucella abortusLinked to Fucose Utilization

2018 ◽  
Vol 200 (18) ◽  
Author(s):  
James A. Budnick ◽  
Lauren M. Sheehan ◽  
Lin Kang ◽  
Pawel Michalak ◽  
Clayton C. Caswell
Keyword(s):  
Brucella Abortus ◽  
Transcriptional Control ◽  
Sugar Transport ◽  
Genetic System ◽  
Growth Conditions ◽  
Content Type ◽  
Small Regulatory Rna ◽  
Small Proteins

ABSTRACTElucidating the function of proteins <50 amino acids in length is no small task. Nevertheless, small proteins can play vital roles in the lifestyle of bacteria and influence the virulence of pathogens; thus, the investigation of the small proteome is warranted. Recently, our group identified theBrucella abortusprotein VtlR as a transcriptional activator of four genes, one of which is the well-studied small regulatory RNA AbcR2, while the other three genes encode hypothetical small proteins, two of which are highly conserved among the orderRhizobiales. This study provides evidence that all three genes encode authentic small proteins and that all three are highly expressed under oxidative stress, low-pH, and stationary-phase growth conditions. Fractionation of the cells revealed that the proteins are localized to the membranes ofB. abortus. We demonstrate that the small proteins under the transcriptional control of VtlR are not accountable for attenuation observed with theB. abortusvtlRdeletion strain. However, there is an association between VtlR-regulated genes and growth inhibition in the presence of the sugarl-fucose. Subsequent transcriptomic analyses revealed thatB. abortusinitiates the transcription of a locus encoding a putative sugar transport and utilization system when the bacteria are cultured in the presence ofl-fucose. Altogether, our observations characterize the role of the VtlR-controlled small proteins BAB1_0914, BAB2_0512, and BAB2_0574 in the biology ofB. abortus, particularly in the capacity of the bacteria to utilizel-fucose.IMPORTANCEDespite being one of the most common zoonoses worldwide, there is currently no human vaccine to combat brucellosis. Therefore, a better understanding of the pathogenesis and biology ofBrucellaspp., the causative agent of brucellosis, is essential for the discovery of novel therapeutics against these highly infectious bacteria. In this study, we further characterize the virulence-associated transcriptional regulator VtlR inBrucella abortus. Our findings not only shed light on our current understanding of a virulence related genetic system inBrucellaspp. but also increase our knowledge of small proteins in the field of bacteriology.

scholarly journals Discovery and characterization of a novel family of prokaryotic nanocompartments involved in sulfur metabolism

2020 ◽  
Author(s):  
Robert J. Nichols ◽  
Benjamin LaFrance ◽  
Naiya R. Phillips ◽  
Luke M. Oltrogge ◽  
Luis E. Valentin-Alvarado ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Biochemical Characterization ◽  
Sulfur Metabolism ◽  
Physiological Role ◽  
Enzymatic Characterization ◽  
Cysteine Desulfurase ◽  
Future Studies ◽  
Pcc 7942

AbstractProkaryotic nanocompartments, also known as encapsulins, are a recently discovered proteinaceous organelle in prokaryotes that compartmentalize cargo enzymes. While initial studies have begun to elucidate the structure and physiological roles of encapsulins, bioinformatic evidence suggests that a great diversity of encapsulin nanocompartments remains unexplored. Here, we describe a novel encapsulin in the freshwater cyanobacterium Synechococcus elongatus PCC 7942. This nanocompartment is upregulated upon sulfate starvation and encapsulates a cysteine desulfurase enzyme via an N-terminal targeting sequence. Using cryoelectron microscopy, we have determined the structure of the nanocompartment complex to 2.2 Å resolution. Lastly, biochemical characterization of the complex demonstrated that the activity of the cysteine desulfurase is enhanced upon encapsulation. Taken together, our discovery, structural analysis, and enzymatic characterization of this prokaryotic nanocompartment provide a foundation for future studies seeking to understand the physiological role of this encapsulin in various bacteria.

scholarly journals Optimization of SPME-GC-MS and Characterization of Floral Scents from Aquilegia Japonica and A. Amurensis Flowers

2020 ◽  
Author(s):  
Hua-Ying Wang ◽  
Wei Zhang ◽  
Jian-Hua Dong ◽  
Hao Wu ◽  
Yuan-Hong Wang ◽  
...  
Keyword(s):  
Solid Phase ◽  
Floral Scent ◽  
Rapid Evolution ◽  
Model Species ◽  
Floral Scents ◽  
Future Studies ◽  
Volatile Organic ◽  
New Ideas

Abstract The floral scent of plants plays a key role in plant reproduction through the communication between plants and pollinators. Aquilegia as a model species for studying evolution, however, there have been few studies on the floral scents and relationships between floral scents and pollination for Aquilegia taxa. In this study, three types of solid-phase micro-extraction (SPME) fiber coatings (DVB/PDMS, CAR/PDMS, DVB/CAR/PDMS) were evaluated for their performance in extracting volatile organic compounds (VOCs) from flowers of Aquilegia amurensis, which can to contribute to the future studies of elucidating the role of floral scents in the pollination process. In total, 55 VOCs were identified, and among them, 50, 47 and 45 VOCs were extracted by the DVB/CAR/PDMS fiber, CAR/PDMS fiber and DVB/PDMS fibers, respectively. Only 30 VOCs were detected in A. japonica taxa. Furthermore, the relative contents of 8 VOCs were significant different (VIP > 1 and p < 0.05) between the A. amurensis and A. japonica. Therefore, the results can be applied in new studies of the relationships between the chemical composition of floral scents and the processes of attraction of pollinator. It may provide new ideas for rapid evolution and frequent interspecific hybridization of Aquilegia

scholarly journals The pathophysiology of sepsis—2021 update: Part 1, immunology and coagulopathy leading to endothelial injury

2021 ◽  
Author(s):  
Judith Jacobi
Keyword(s):  
Treatment Options ◽  
Endothelial Injury ◽  
Coagulation Cascade ◽  
Secondary Infections ◽  
Sepsis And Septic Shock ◽  
Risk And Benefit ◽  
Insight Into ◽  
Related Mortality

Abstract Disclaimer In an effort to expedite the publication of articles related to the COVID-19 pandemic, AJHP is posting these manuscripts online as soon as possible after acceptance. Accepted manuscripts have been peer-reviewed and copyedited, but are posted online before technical formatting and author proofing. These manuscripts are not the final version of record and will be replaced with the final article (formatted per AJHP style and proofed by the authors) at a later time. Purpose To provide an overview of current literature on the pathophysiology of sepsis, with a focus on mediators of endothelial injury and organ dysfunction. Summary Sepsis is a dysregulated response to infection that triggers cascades of interconnected systems. Sepsis has been a significant cause of mortality worldwide, and the recent viral pandemic that may produce severe sepsis and septic shock has been a major contributor to sepsis-related mortality. Understanding of the pathophysiology of sepsis has changed dramatically over the last several decades. Significant insight into the components of the inflammatory response that contribute to endothelial injury and trigger coagulation pathways has been achieved. Similarly, characterization of anti-inflammatory pathways that may lead to secondary infections and poor outcome has illustrated opportunities for improved therapies. Description of an increasing number of important mediators and pathways has occurred and may point the way to novel therapies to address immune dysregulation. Pharmacists will need a fundamental understanding of the overlapping pathways of the immune response to fully prepare for use of novel treatment options. While pharmacists typically understand coagulation cascade how to utilize anticoagulants, the issues in sepsis related coagulopathy and role of mediators such as cytokines and complement and role of activated platelets and neutrophils require a different perspective. Conclusion Pharmacists can benefit from understanding both the cellular and organ system issues in sepsis to facilitate assessment of potential therapies for risk and benefit.

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