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Immunometabolism

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https://www.readbyqxmd.com/read/28812211/the-immune-system-in-obesity-developing-paradigms-amidst-inconvenient-truths
#1
REVIEW
Madhur Agrawal, Philip A Kern, Barbara S Nikolajczyk
PURPOSE OF REVIEW: Adipose tissue (AT) houses both innate and adaptive immune systems that are crucial for preserving AT function and metabolic homeostasis. In this review, we summarize recent information regarding progression of obesity-associated AT inflammation and insulin resistance. We additionally consider alterations in AT distribution and the immune system in males vs. females and among different racial populations. RECENT FINDINGS: Innate and adaptive immune cell-derived inflammation drives insulin resistance both locally and systemically...
August 15, 2017: Current Diabetes Reports
https://www.readbyqxmd.com/read/28806133/autophagy-dictates-metabolism-and-differentiation-of-inflammatory-immune-cells
#2
Thomas Riffelmacher, Felix Clemens Richter, Anna Katharina Simon
The role of macroautophagy/autophagy, a conserved lysosomal degradation pathway, during cellular differentiation has been well studied over the last decade. Particularly, evidence for its role during immune cell differentiation is growing. Despite the description of a variety of dramatic immune phenotypes in tissue-specific autophagy knockout models, the underlying mechanisms are still under debate. One of the proposed mechanisms is the impact of autophagy on the altered metabolic states during immune cell differentiation...
August 14, 2017: Autophagy
https://www.readbyqxmd.com/read/28804129/immunometabolism-nk-cell-subset-expands-with-your-waistline
#3
Lucy Bird
No abstract text is available yet for this article.
August 14, 2017: Nature Reviews. Immunology
https://www.readbyqxmd.com/read/28796886/macrophage-metabolism-in-atherosclerosis
#4
REVIEW
Gael F P Bories, Norbert Leitinger
A key aspect of atherosclerosis is the maladaptive inflammatory response to lipoprotein accumulation in the artery. The failure to decrease lipid accumulation, to clear apoptotic cells and to resolve inflammation ultimately leads to macrophage accumulation within the vascular wall(1,2,3,4) . Several subsets of macrophages are found inside atherosclerotic plaques(5,6,7) : Pro-inflammatory M1-like macrophages potentially participate in atherosclerosis initiation and progression; M2-like macrophages are thought to be protective due to their anti-inflammatory and profibrotic properties, presumably stabilizing the plaque(8,9;) Mox macrophages develop in response to oxidized phospholipids and present a glutathione- and potentially redox-regulating phenotype(10) ; Mhem macrophages are found in areas of plaque hemorrhage(11,12) where they are involved in heme clearance...
August 10, 2017: FEBS Letters
https://www.readbyqxmd.com/read/28791013/editorial-immunometabolic-regulations-in-adaptive-and-innate-immune-cells-shapes-and-re-directs-host-immunity
#5
EDITORIAL
Ping-Chih Ho, Christoph Hess
No abstract text is available yet for this article.
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28768434/metabolic-reprogramming-during-hepatitis-b-disease-progression-offers-novel-diagnostic-and-therapeutic-opportunities
#6
REVIEW
Jesse Jr Masson, Hugh Ww Billings, Clovis S Palmer
Metabolic remodeling occurs in immune cells during an infection. Host cells must upregulate energy production for growth, proliferation, and effector functions to limit the damage imposed by pathogens. One example, the hepatitis B virus, induces hepatic injury in human hepatocytes through dysregulation of aerobic glycolysis and lipid metabolism. Increased glycolytic metabolism mediated by elevated expression of Glut1, glucose influx, and lactate secretion is associated with this Warburg phenotype, a classic metabolic signature also observed in cancer cells...
August 2017: Antiviral Chemistry & Chemotherapy
https://www.readbyqxmd.com/read/28767543/lactate-and-immunosuppression-in-sepsis
#7
Benjamin Nolt, Fei Tu, Xiaohui Wang, Tuanzhu Ha, Randi Winter, David L Williams, Chuanfu Li
Serum lactate levels are traditionally interpreted as a marker of tissue hypoxia and often used clinically as an indicator of severity and outcome of sepsis/septic shock. Interestingly, recent studies involving the effects of tumor-derived lactate suggest that lactate itself may have an immunosuppressive effect in its local environment. This finding adds to the recent advances in immunometabolism that shed light on the importance of metabolism and metabolic intermediates in the regulation of innate immune and inflammatory responses in sepsis...
August 1, 2017: Shock
https://www.readbyqxmd.com/read/28764798/an-interaction-map-of-circulating-metabolites-immune-gene-networks-and-their-genetic-regulation
#8
Artika P Nath, Scott C Ritchie, Sean G Byars, Liam G Fearnley, Aki S Havulinna, Anni Joensuu, Antti J Kangas, Pasi Soininen, Annika Wennerström, Lili Milani, Andres Metspalu, Satu Männistö, Peter Würtz, Johannes Kettunen, Emma Raitoharju, Mika Kähönen, Markus Juonala, Aarno Palotie, Mika Ala-Korpela, Samuli Ripatti, Terho Lehtimäki, Gad Abraham, Olli Raitakari, Veikko Salomaa, Markus Perola, Michael Inouye
BACKGROUND: Immunometabolism plays a central role in many cardiometabolic diseases. However, a robust map of immune-related gene networks in circulating human cells, their interactions with metabolites, and their genetic control is still lacking. Here, we integrate blood transcriptomic, metabolomic, and genomic profiles from two population-based cohorts (total N = 2168), including a subset of individuals with matched multi-omic data at 7-year follow-up. RESULTS: We identify topologically replicable gene networks enriched for diverse immune functions including cytotoxicity, viral response, B cell, platelet, neutrophil, and mast cell/basophil activity...
August 1, 2017: Genome Biology
https://www.readbyqxmd.com/read/28757685/immunometabolism-molecular-mechanisms-diseases-and-therapies-2016
#9
EDITORIAL
Jose C Rosa Neto, Fabio S Lira, Soumen Roy, William Festuccia
No abstract text is available yet for this article.
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28755942/regulation-of-inflammation-antioxidant-production-and-methyl-carbon-metabolism-during-methionine-supplementation-in-lipopolysaccharide-challenged-neonatal-bovine-hepatocytes
#10
Qian Zhang, Heather M White
Supplementation of methionine (Met) may improve immunometabolic status, specifically during a period of inflammatory stress. The aim of the present study was to establish an inflammation model using primary neonatal bovine hepatocytes and to examine the effects of increasing concentrations of dl-Met and a maintained Met to lysine (Lys) ratio on hepatocyte inflammatory responses, antioxidant production, and Met metabolism during lipopolysaccharide (LPS) challenge. Hepatocytes isolated from 4 calves were maintained as monolayer cultures and exposed to 0, 10, or 40 µMdl-Met and 100 µM Lys (0Met100Lys, 10Met100Lys, or 40Met100Lys) or 10 µMdl-Met and 25 µM Lys (10Met25Lys)...
July 26, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28754302/immunometabolic-and-lipidomic-markers-associated-with-the-frailty-index-and-quality-of-life-in-aging-hiv-men-on-antiretroviral-therapy
#11
Hui-Ling Yeoh, Allen C Cheng, Catherine L Cherry, Jacquelyn M Weir, Peter J Meikle, Jennifer F Hoy, Suzanne M Crowe, Clovis S Palmer
Chronic immune activation persists despite antiretroviral therapy (ART) in HIV+ individuals and underpins an increased risk of age-related co-morbidities. We assessed the Frailty Index in older HIV+ Australian men on ART. Immunometabolic markers on monocytes and T cells were analyzed using flow cytometry, plasma innate immune activation markers by ELISA, and lipidomic profiling by mass spectrometry. The study population consisted of 80 HIV+ men with a median age of 59 (IQR, 56-65), and most had an undetectable viral load (92%)...
August 2017: EBioMedicine
https://www.readbyqxmd.com/read/28745372/systems-level-organization-of-non-alcoholic-fatty-liver-disease-progression-network
#12
K Shubham, L Vinay, P K Vinod
Non-Alcoholic Fatty Liver Disease (NAFLD) is a complex spectrum of diseases ranging from simple steatosis to Non-Alcoholic Steatohepatitis (NASH) with fibrosis, which can progress to cirrhosis and hepatocellular carcinoma. The pathogenesis of NAFLD is complex, involving crosstalk between multiple organs, cell-types, and environmental and genetic factors. Dysfunction of the adipose tissue plays a central role in NAFLD progression. Here, we analysed transcriptomics data obtained from the Visceral Adipose Tissue (VAT) of NAFLD patients to understand how the VAT metabolism is altered at the genome scale and co-regulated with other cellular processes during the progression from obesity to NASH with fibrosis...
July 26, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28724580/il-7-restores-t-lymphocyte-immunometabolic-failure-in-septic-shock-patients-through-mtor-activation
#13
Fabienne Venet, Julie Demaret, Benjamin J Blaise, Christelle Rouget, Thibaut Girardot, Estellie Idealisoa, Thomas Rimmelé, François Mallet, Alain Lepape, Julien Textoris, Guillaume Monneret
T lymphocyte alterations are central to sepsis pathophysiology, whereas related mechanisms remain poorly understood. We hypothesized that metabolic alterations could play a role in sepsis-induced T lymphocyte dysfunction. Samples from septic shock patients were obtained at day 3 and compared with those from healthy donors. T cell metabolic status was evaluated in the basal condition and after T cell stimulation. We observed that basal metabolic content measured in lymphocytes by nuclear magnetic resonance spectroscopy was altered in septic patients...
July 19, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28720125/profiling-of-the-perturbed-metabolomic-state-of-mouse-spleen-during-acute-and-chronic-toxoplasmosis
#14
Xiao-Qing Chen, Chun-Xue Zhou, Hany M Elsheikha, Shuai He, Gui-Xue Hu, Xing-Quan Zhu
BACKGROUND: Toxoplasma gondii, a common opportunistic protozoan, is a leading cause of illness and mortality among immunosuppressed individuals and during congenital infections. Current therapeutic strategies for toxoplasmosis are not fully effective at curtailing disease progression in these cases. Given the parasite ability to influence host immunity and metabolism, understanding of the metabolic alterations in the host's immune organs during T. gondii infection may enhance the understanding of the molecular mechanisms that define the pathophysiology of T...
July 18, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28683277/the-immunometabolism-choreography
#15
EDITORIAL
Nikla Emambokus, Anne Granger, Rosalind Mott, Taneli Helenius
No abstract text is available yet for this article.
July 5, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28657335/immunometabolic-regulation-of-vascular-redox-state-the-role-of-adipose-tissue
#16
Evangelos K Oikonomou, Charalambos Antoniades
SIGNIFICANCE: Vascular oxidative stress plays a crucial role in atherogenesis and cardiovascular disease (CVD). Recent evidence suggests that vascular redox state is under the control of complex pathophysiological mechanisms, ranging from inflammation to obesity and insulin resistance (IR). Recent advances: Adipose tissue (AT) is now recognized as a dynamic endocrine and paracrine organ that secretes several bioactive molecules, called adipokines. AT has recently been shown to regulate vascular redox state in both an endocrine and a paracrine manner through the secretion of adipokines, therefore providing a mechanistic link for the association between obesity, IR, inflammation and vascular disease...
June 28, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28649760/immunometabolism-of-human-autoimmune-diseases-from-metabolites-to-extracellular-vesicles
#17
REVIEW
Paola de Candia, Veronica De Rosa, Vincenzo Gigantino, Gerardo Botti, Antonio Ceriello, Giuseppe Matarese
Immunometabolism focuses on the mechanisms regulating the impact of metabolism on lymphocyte activity and autoimmunity outbreak. The adipose tissue is long known to release adipokines, either pro- or anti-inflammatory factors bridging nutrition and immune function. More recently, adipocytes were discovered to also release extracellular vesicles (EVs) containing a plethora of biological molecules, including metabolites and microRNAs, which can regulate cell function/metabolism in distant tissues, suggesting that immune regulatory function by the adipose tissue may be far more complex than originally thought...
June 26, 2017: FEBS Letters
https://www.readbyqxmd.com/read/28613152/reduction-of-infection-by-inhibiting-mtor-pathway-is-associated-with-reversed-repression-of-type-i-interferon-by-porcine-reproductive-and-respiratory-syndrome-virus
#18
Qinfang Liu, Laura C Miller, Frank Blecha, Yongming Sang
Type I interferons (IFNs) are critical in animal antiviral regulation. IFN-mediated signalling regulates hundreds of genes that are directly associated with antiviral, immune and other physiological responses. The signalling pathway mediated by mechanistic target of rapamycin (mTOR), a serine/threonine kinase regulated by IFNs, is key in regulation of cellular metabolism and was recently implicated in host antiviral responses. However, little is known about how animal type I IFN signalling coordinates immunometabolic reactions during antiviral defence...
June 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28591633/cytochrome-c-oxidase-activity-is-a-metabolic-checkpoint-that-regulates-cell-fate-decisions-during-t-cell-activation-and-differentiation
#19
Tatyana N Tarasenko, Susan E Pacheco, Mary Kay Koenig, Julio Gomez-Rodriguez, Senta M Kapnick, Francisca Diaz, Patricia M Zerfas, Emanuele Barca, Jessica Sudderth, Ralph J DeBerardinis, Raul Covian, Robert S Balaban, Salvatore DiMauro, Peter J McGuire
T cells undergo metabolic reprogramming with major changes in cellular energy metabolism during activation. In patients with mitochondrial disease, clinical data were marked by frequent infections and immunodeficiency, prompting us to explore the consequences of oxidative phosphorylation dysfunction in T cells. Since cytochrome c oxidase (COX) is a critical regulator of OXPHOS, we created a mouse model with isolated dysfunction in T cells by targeting a gene, COX10, that produces mitochondrial disease in humans...
June 6, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28588189/metabolic-injury-induced-nlrp3-inflammasome-activation-dampens-phospholipid-degradation
#20
Elena Rampanelli, Evelyn Orsó, Peter Ochodnicky, Gerhard Liebisch, Pieter J Bakker, Nike Claessen, Loes M Butter, Marius A van den Bergh Weerman, Sandrine Florquin, Gerd Schmitz, Jaklien C Leemans
The collateral effects of obesity/metabolic syndrome include inflammation and renal function decline. As renal disease in obesity can occur independently of hypertension and diabetes, other yet undefined causal pathological pathways must be present. Our study elucidate novel pathological pathways of metabolic renal injury through LDL-induced lipotoxicity and metainflammation. Our in vitro and in vivo analysis revealed a direct lipotoxic effect of metabolic overloading on tubular renal cells through a multifaceted mechanism that includes intralysosomal lipid amassing, lysosomal dysfunction, oxidative stress, and tubular dysfunction...
June 6, 2017: Scientific Reports
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