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adipocyte tissue macrophage

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https://www.readbyqxmd.com/read/28445821/the-ampk-mtor-pathway-is-involved-in-d-dopachrome-tautomerase-gene-transcription-in-adipocytes-differentiated-from-sgbs-cells-a-human-preadipocyte-cell-line
#1
Takeo Iwata, Kyoko Kuribayashi, Masahiko Nakasono, Noriko Saito-Tarashima, Noriaki Minakawa, Noriko Mizusawa, Rie Kido, Katsuhiko Yoshimoto
In adipose tissue, D-dopachrome tautomerase (DDT), a cytokine with structural similarity to macrophage migration inhibitory factor, is mainly expressed in adipocytes rather than preadipocytes and acts as an anti-obesity adipokine in an autocrine manner. However, its transcriptional regulation is largely unknown. In order to explore molecules affecting DDT transcription, a chemical library screening using HEK293 cells stably expressing a DDT promoter-reporter construct was performed. Several derivatives of 5-aminoimidazole-4-carboxamide-1-β-d-ribofuranoside (AICAR), an AMP-activated protein kinase (AMPK) activator, were identified as transcriptional activators of the DDT gene...
April 23, 2017: Cytokine
https://www.readbyqxmd.com/read/28445487/bmt-decreases-hfd-induced-weight-gain-associated-with-decreased-preadipocyte-number-and-insulin-secretion
#2
Saeed Katiraei, Lisa R Hoving, Lianne van Beek, Sharida Mohamedhoesein, Françoise Carlotti, Janna A van Diepen, Patrick C N Rensen, Mihai G Netea, Ko Willems van Dijk, Jimmy F P Berbée, Vanessa van Harmelen
Experimental bone marrow transplantation (BMT) in mice is commonly used to assess the role of immune cell-specific genes in various pathophysiological settings. The application of BMT in obesity research is hampered by the significant reduction in high-fat diet (HFD)-induced obesity. We set out to characterize metabolic tissues that may be affected by the BMT procedure and impair the HFD-induced response. Male C57BL/6 mice underwent syngeneic BMT using lethal irradiation. After a recovery period of 8 weeks they were fed a low-fat diet (LFD) or HFD for 16 weeks...
2017: PloS One
https://www.readbyqxmd.com/read/28441086/hematopoietic-to-mesenchymal-transition-of-adipose-tissue-macrophages-is-regulated-by-integrin-%C3%AE-1-and-fabricated-fibrin-matrices
#3
Kathleen M Gavin, Susan M Majka, Wendy M Kohrt, Heidi L Miller, Timothy M Sullivan, Dwight J Klemm
Some bona fide adult adipocytes arise de novo from a bone marrow-derived myeloid lineage. These studies further demonstrate that adipose tissue stroma contains a resident population of myeloid cells capable of adipocyte and multilineage mesenchymal differentiation. These resident myeloid cells lack hematopoietic markers and express mesenchymal and progenitor cell markers. Because bone marrow mesenchymal progenitor cells have not been shown to enter the circulation, we hypothesized that myeloid cells acquire mesenchymal differentiation capacity in adipose tissue...
April 3, 2017: Adipocyte
https://www.readbyqxmd.com/read/28438715/impact-of-physical-exercise-on-visceral-adipose-tissue-fatty-acid-profile-and-inflammation-in-response-to-a-high-fat-diet-regimen
#4
Sílvia Rocha-Rodrigues, Amaia Rodríguez, Inês O Gonçalves, Ana Moreira, Elisabete Maciel, Sónia Santos, Maria R Domingues, Gema Frühbeck, António Ascensão, José Magalhães
PURPOSE: Studies associate specific fatty-acids (FA) with the pathophysiology of inflammation. We aimed to analyze the impact of exercise on adipose tissue FA profile in response to a high-fat diet (HFD) and to ascertain whether these exercise-induced changes in specific FA have repercussions on obesity-related inflammation. METHODS: Sprague-Dawley rats were assigned into sedentary, voluntary physical-activity (VPA) and endurance training (ET) groups fed a standard (S, 35kcal% fat) or high-fat (71kcal% fat) diets...
April 21, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28427135/-effects-of-allogeneic-bone-marrow-mesenchymal-stem-cells-on-polarization-of-peritoneal-macrophages-in-rats-with-sepsis
#5
Y H Zheng, B Xiong, Y Y Deng, W Lai, S Y Zheng, H N Bian, Z A Liu, Z F Huang, C W Sun, H H Li, H M Luo, L H Ma, H X Chen
Objective: To explore the effects of allogeneic bone marrow mesenchymal stem cells (BMSCs) on polarization of peritoneal macrophages isolated from rats with sepsis induced by endotoxin/lipopolysaccharide (LPS). Methods: (1) BMSCs were isolated, cultured and purified from 5 SD rats with whole bone marrow adherent method. The third passage of cells were collected for morphologic observation, detection of expressions of stem cell surface markers CD29, CD44, CD45, and CD90 with flow cytometer, and identification of osteogenic and adipogenic differentiation...
April 20, 2017: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/28424360/intermittent-hypoxia-in-obstructive-sleep-apnoea-mediates-insulin-resistance-through-adipose-tissue-inflammation
#6
Aoife M Murphy, Amandine Thomas, Sophie J Crinion, Brian D Kent, Murtaza M Tambuwala, Aurelie Fabre, Jean-Louis Pepin, Helen M Roche, Claire Arnaud, Silke Ryan
Obstructive sleep apnoea (OSA) is increasingly associated with insulin resistance. The underlying pathophysiology remains unclear but intermittent hypoxia (IH)-mediated inflammation and subsequent dysfunction of the adipose tissue has been hypothesised to play a key role.We tested this hypothesis employing a comprehensive translational approach using a murine IH model of lean and diet-induced obese mice, an innovative IH system for cell cultures and a tightly controlled patient cohort.IH led to the development of insulin resistance in mice, corrected for the degree of obesity, and reduced insulin-mediated glucose uptake in 3T3-L1 adipocytes, associated with inhibition of the insulin-signalling pathway and downregulation of insulin-receptor substrate-1 mRNA...
April 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28424185/very-long-chain-%C3%AF-3-fatty-acid-supplements-and-adipose-tissue-functions-a-randomized-controlled-trial
#7
Kazanna C Hames, Maria Morgan-Bathke, Debra A Harteneck, Lendia Zhou, John D Port, Ian R Lanza, Michael D Jensen
Background: Increased omega-3 (n-3) fatty acid consumption is reported to benefit patients with metabolic syndrome, possibly due to improved adipose tissue function.Objective: We tested the effects of high-dose, very-long-chain ω-3 fatty acids on adipose tissue inflammation and insulin regulation of lipolysis.Design: A double-blind, placebo-controlled study compared 6 mo of 3.9 g eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)/d (4.2 g total ω-3/d; n = 12) with a placebo (4.2 g oleate/d; n = 9) in insulin-resistant adults...
April 19, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28422570/an-induced-adipocyte-sheet-reduces-inflammatory-reactions-during-remodeling-of-xenogeneic-scaffolds-in-vivo
#8
Tong Yi, Qiang Wang, Fan Fan, Gouhui Fan
Surgical therapy of cardiovascular diseases frequently requires replacement of diseased tissues with prosthetic devices or grafts. Calcification is the main reason for the degeneration of implanted grafts. However, some factors reduce stenosis and attenuate calcification of implanted grafts. In this study, we used an autologous induced adipocyte cell-sheet (IACS) as a drug delivery system to determine whether its secretion ability has a beneficial effect on the remodeling process of grafts in a rat subcutaneous model...
April 19, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28420992/deficient-adipogenesis-of-scleroderma-patient-and-healthy-african-american-monocytes
#9
Rebecca Lee, Charles Reese, Gustavo Carmen-Lopez, Beth Perry, Michael Bonner, Marina Zemskova, Carole L Wilson, Kristi L Helke, Richard M Silver, Stanley Hoffman, Elena Tourkina
Monocytes from systemic sclerosis (SSc, scleroderma) patients and healthy African Americans (AA) are deficient in the regulatory protein caveolin-1 leading to enhanced migration toward chemokines and fibrogenic differentiation. While dermal fibrosis is the hallmark of SSc, loss of subcutaneous adipose tissue is a lesser-known feature. To better understand the etiology of SSc and the predisposition of AA to SSc, we studied the adipogenic potential of SSc and healthy AA monocytes. The ability of SSc and healthy AA monocytes to differentiate into adipocyte-like cells (ALC) is inhibited compared to healthy Caucasian (C) monocytes...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28420164/the-angiogenesis-inhibitor-als-l1023-from-lemon-balm-leaves-attenuates-high-fat-diet-induced-nonalcoholic-fatty-liver-disease-through-regulating-the-visceral-adipose-tissue-function
#10
Jeongjun Kim, Haerim Lee, Jonghoon Lim, Jaeho Oh, Soon Shik Shin, Michung Yoon
Similar to neoplastic tissues, growth and development of adipose tissue are thought to be angiogenesis-dependent. Since visceral adipose tissue (VAT) is associated with development and progression of nonalcoholic fatty liver disease (NAFLD), we hypothesized that angiogenesis inhibition would attenuate obesity-induced NAFLD. We fed C57BL/6J mice a low-fat diet (LFD, chow 10% kcal fat), a high-fat diet (HFD, 45% kcal fat) or HFD supplemented with the lemon-balm extract ALS-L1023 (HFD-ALS) for 15 weeks. ALS-L1023 reduced endothelial cell-tube formation in vitro...
April 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28414329/alternatively-activated-macrophages-do-not-synthesize-catecholamines-or-contribute-to-adipose-tissue-adaptive-thermogenesis
#11
Katrin Fischer, Henry H Ruiz, Kevin Jhun, Brian Finan, Douglas J Oberlin, Verena van der Heide, Anastasia V Kalinovich, Natasa Petrovic, Yochai Wolf, Christoffer Clemmensen, Andrew C Shin, Senad Divanovic, Frank Brombacher, Elke Glasmacher, Susanne Keipert, Martin Jastroch, Joachim Nagler, Karl-Werner Schramm, Dasa Medrikova, Gustav Collden, Stephen C Woods, Stephan Herzig, Dirk Homann, Steffen Jung, Jan Nedergaard, Barbara Cannon, Matthias H Tschöp, Timo D Müller, Christoph Buettner
Adaptive thermogenesis is the process of heat generation in response to cold stimulation. It is under the control of the sympathetic nervous system, whose chief effector is the catecholamine norepinephrine (NE). NE enhances thermogenesis through β3-adrenergic receptors to activate brown adipose tissue and by 'browning' white adipose tissue. Recent studies have reported that alternative activation of macrophages in response to interleukin (IL)-4 stimulation induces the expression of tyrosine hydroxylase (TH), a key enzyme in the catecholamine synthesis pathway, and that this activation provides an alternative source of locally produced catecholamines during the thermogenic process...
April 17, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28414311/a-self-sustained-loop-of-inflammation-driven-inhibition-of-beige-adipogenesis-in-obesity
#12
Kyoung-Jin Chung, Antonios Chatzigeorgiou, Matina Economopoulou, Ruben Garcia-Martin, Vasileia I Alexaki, Ioannis Mitroulis, Marina Nati, Janine Gebler, Tjalf Ziemssen, Susan E Goelz, Julia Phieler, Jong-Hyung Lim, Katia P Karalis, Thalia Papayannopoulou, Matthias Blüher, George Hajishengallis, Triantafyllos Chavakis
In obesity, inflammation of white adipose tissue (AT) is associated with diminished generation of beige adipocytes ('beige adipogenesis'), a thermogenic and energy-dissipating function mediated by beige adipocytes that express the uncoupling protein UCP1. Here we delineated an inflammation-driven inhibitory mechanism of beige adipogenesis in obesity that required direct adhesive interactions between macrophages and adipocytes mediated by the integrin α4 and its counter-receptor VCAM-1, respectively; expression of the latter was upregulated in obesity...
April 17, 2017: Nature Immunology
https://www.readbyqxmd.com/read/28414075/vitamin-b2-deficiency-enhances-the-pro-inflammatory-activity-of-adipocyte-consequences-for-insulin-resistance-and-metabolic-syndrome-development
#13
Agnieszka Irena Mazur-Bialy, Ewa Pocheć
AIMS: Adipose tissue is an endocrine organ important for regulation of such physiological processes as energy metabolism or lipids homeostasis. In an obesity state, it participates in the induction of chronic systemic inflammation accompanied by pro-inflammatory cytokines and fatty acid elevation. For this reasons, adipose tissue is involved in, e.g., insulin resistance, type 2 diabetes or hyperlipidemia development. In our previous study, we have shown that riboflavin deficiency induces a pathological pro-inflammatory response of macrophages, the main component of adipose tissue...
April 14, 2017: Life Sciences
https://www.readbyqxmd.com/read/28410190/dietary-oleuropein-inhibits-tumor-angiogenesis-and-lymphangiogenesis-in-the-b16f10-melanoma-allograft-model-a-mechanism-for-the-suppression-of-high-fat-diet-induced-solid-tumor-growth-and-lymph-node-metastasis
#14
Hyerim Song, Do Young Lim, Jae In Jung, Han Jin Cho, So Young Park, Gyoo Taik Kwon, Young-Hee Kang, Ki Won Lee, Myung-Sook Choi, Jung Han Yoon Park
Previously, we reported that high-fat-diet (HFD)-induced obesity stimulates melanoma progression in the B16F10 allograft model. In this study, we examined whether oleuropein (OL), the most abundant phenolic compound in olives, inhibits HFD-induced melanoma progression. Four-week-old male C57BL/6N mice were fed a HFD-diet with or without OL. After 16 weeks of feeding, B16F10-luc cells were subcutaneously injected and the primary tumor was resected 3 weeks later. OL suppressed HFD-induced solid tumor growth. In the tumor tissues, OL reduced HFD-induced expression of angiogenesis (CD31, VE-cadherin, VEGF-A, and VEGFR2), lymphangiogenesis (LYVE-1, VEGF-C, VEGF-D, and VEGFR3), and hypoxia (HIF-1α and GLUT-1) markers as well as HFD-induced increases in lipid vacuoles and M2 macrophages (MΦs)...
March 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/28399645/prohibitin-at-the-crossroads-of-obesity-linked-diabetes-and-cancer
#15
Suresh Mishra, Bl Grégoire Nyomba
The promoter of a gene that is selectively expressed in just a few cell types provides unique opportunities to study: (1) the pleiotropic function of a protein in two different cell types including the cell compartment specific function, and (2) the crosstalk between two cell/tissue types at the systemic level. This is not possible with a ubiquitous or a highly specific gene promoter. The adipocyte protein-2 ( aP2) is one such gene. It is primarily expressed in adipocytes, but also selectively in monocytic macrophages and dendritic cells, among various immune cell types...
January 1, 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28395010/inflammation-and-metabolic-cardiomyopathy
#16
Kazuhiko Nishida, Kinya Otsu
Excessive feeding is associated with an increase in the incidence of chronic metabolic diseases, such as obesity, insulin resistance, and type 2 diabetes. Metabolic disturbance induces chronic low-grade inflammation in metabolically-important organs, such as the liver and adipose tissue. Many of the inflammatory signalling pathways are directly triggered by nutrients. The pro-inflammatory mediators in adipocytes and macrophages infiltrating adipose tissue promote both local and systemic pro-inflammatory status...
March 15, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28388816/adipose-tissue-macrophages-in-rheumatoid-arthritis-prevalence-disease-related-indicators-and-associations-with-cardiometabolic-risk-factors
#17
Jon T Giles, Antony W Ferrante, Rachel Broderick, Afshin Zartoshti, Janine Rose, Kendall Downer, Hui-Zhu Zhang, Robert J Winchester
Objective Adipose tissue macrophages (ATMs) are a potent source of inflammatory cytokines with profound effects on adipose tissue function, yet their potential role in rheumatoid arthritis (RA) pathobiology is largely unstudied. Methods Periumbilical subcutaneous adipose tissue was obtained from 36 RA patients and 22 non-RA controls frequency matched on demographics and BMI. Samples were stained for the macrophage marker CD68 and the average proportion of ATMs, crown-like structures (CLSs: peri-adipocyte aggregates of three or more ATMs), and fibrosis were compared between groups...
April 7, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28382382/sucnr1-mediated-chemotaxis-of-macrophages-aggravates-obesity-induced-inflammation-and-diabetes
#18
Janna A van Diepen, Joris H Robben, Guido J Hooiveld, Claudia Carmone, Mohammad Alsady, Lily Boutens, Melissa Bekkenkamp-Grovenstein, Anneke Hijmans, Udo F H Engelke, Ron A Wevers, Mihai G Netea, Cees J Tack, Rinke Stienstra, Peter M T Deen
AIMS/HYPOTHESIS: Obesity induces macrophages to drive inflammation in adipose tissue, a crucial step towards the development of type 2 diabetes. The tricarboxylic acid (TCA) cycle intermediate succinate is released from cells under metabolic stress and has recently emerged as a metabolic signal induced by proinflammatory stimuli. We therefore investigated whether succinate receptor 1 (SUCNR1) could play a role in the development of adipose tissue inflammation and type 2 diabetes. METHODS: Succinate levels were determined in human plasma samples from individuals with type 2 diabetes and non-diabetic participants...
April 5, 2017: Diabetologia
https://www.readbyqxmd.com/read/28377871/weight-loss-independent-changes-in-adipose-tissue-macrophage-and-t-cell-populations-after-sleeve-gastrectomy-in-mice
#19
Henriette Frikke-Schmidt, Brian F Zamarron, Robert W O'Rourke, Darleen A Sandoval, Carey N Lumeng, Randy J Seeley
OBJECTIVE: In addition to adipocytes, adipose tissue contains large numbers of immune cells. A wide range of evidence links the activity of these cells to regulation of adipocyte and systemic metabolic function. Bariatric surgery improves several aspects of metabolic derangements and at least some of these effects occur in a weight-loss independent manner. We sought to investigate the impact of vertical sleeve gastrectomy (VSG) on adipose immune cell frequencies. METHODS: We analyzed the frequencies of immune cells within distinct adipose tissue depots in obese mice that had VSG or sham surgery with a portion of the latter group pair-fed such that their body mass was matched to the VSG animals...
April 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/28374574/a-comparative-assessment-of-adipose-derived-stem-cells-from-subcutaneous-and-visceral-fat-as-a-potential-cell-source-for-knee-osteoarthritis-treatment
#20
Yan Tang, Zhang-Yi Pan, Ying Zou, Yi He, Peng-Yuan Yang, Qi-Qun Tang, Feng Yin
The intra-articular injection of adipose-derived stem cells (ASCs) is a novel potential therapy for patients with osteoarthritis (OA). However, the efficacy of ASCs from different regions of the body remains unknown. This study investigated whether ASCs from subcutaneous or visceral adipose tissue provide the same improvement of OA. Mouse and human subcutaneous and visceral adipose tissue were excised for ASC isolation. Morphology, proliferation, surface markers and adipocyte differentiation of subcutaneous ASCs (S-ASCs) and visceral ASCs (V-ASCs) were analysed...
April 4, 2017: Journal of Cellular and Molecular Medicine
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