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adipose crosstalk

Michaël R Laurent
An overview of selected papers related to bone published in 2017 is provided. PURPOSE: This paper accompanies a lecture at the 2018 Belgian Bone Club annual Clinical Update Symposium held in Brussels on January 20th, discussing the best papers (in the opinion of the author) published in the previous year. METHODS: A PubMed search using the keyword "bone" and articles published in 2017. RESULTS: Hot topics include screening for osteoporosis, novel anabolic drugs such as romosozumab and abaloparatide for osteoporosis and rare metabolic bone diseases, as well as long-term efficacy of denosumab and possible risk of multiple vertebral fractures following its discontinuation...
March 15, 2018: Archives of Osteoporosis
Claire E Macdougall, Elizabeth G Wood, Jakob Loschko, Valeria Scagliotti, Féaron C Cassidy, Mark E Robinson, Niklas Feldhahn, Leandro Castellano, Mathieu-Benoit Voisin, Federica Marelli-Berg, Carles Gaston-Massuet, Marika Charalambous, M Paula Longhi
Visceral adipose tissue (VAT) has multiple roles in orchestrating whole-body energy homeostasis. In addition, VAT is now considered an immune site harboring an array of innate and adaptive immune cells with a direct role in immune surveillance and host defense. We report that conventional dendritic cells (cDCs) in VAT acquire a tolerogenic phenotype through upregulation of pathways involved in adipocyte differentiation. While activation of the Wnt/β-catenin pathway in cDC1 DCs induces IL-10 production, upregulation of the PPARγ pathway in cDC2 DCs directly suppresses their activation...
March 6, 2018: Cell Metabolism
Russell T Turner, Stephen A Martin, Urszula T Iwaniec
PURPOSE OF REVIEW: Mesenchymal stem cells (MSCs) located in the bone marrow have the capacity to differentiate into multiple cell lineages, including osteoblast and adipocyte. Adipocyte density within marrow is inversely associated with bone mass during aging and in some pathological conditions, contributing to the prevailing view that marrow adipocytes play a largely negative role in bone metabolism. However, a negative association between marrow adipocytes and bone balance is not universal...
February 28, 2018: Current Osteoporosis Reports
Abdelkrim Khadir, Sina Kavalakatt, Preethi Cherian, Samia Warsame, Jehad Ahmed Abubaker, Mohammed Dehbi, Ali Tiss
Heat shock protein 60 (HSP60) is a key protein in the crosstalk between cellular stress and inflammation. However, the status of HSP60 in diabetes and obesity is unclear. In the present study, we investigated the hypothesis that HSP60 expression levels in the adipose tissue of human obese adults with and without diabetes are different and physical exercise might affect these levels. Subcutaneous adipose tissue (SAT) and blood samples were collected from obese adults with and without diabetes ( n  = 138 and n  = 92, respectively, at baseline; n  = 43 for both groups after 3 months of physical exercise)...
2018: Frontiers in Endocrinology
Isabel Quesada, Jimena Cejas, Rodrigo García, Beatriz Cannizzo, Analía Redondo, Claudia Castro
AIM: Perivascular adipose tissue (PVAT) is in intimate contact with the vessel wall and extravascular PVAT-derived inflammatory mediators may adversely influence atherosclerotic plaque formation and stability through outside-to-inside signalling. We sought to investigate the role of PVAT on the atheroma development in an experimental animal model of Metabolic Syndrome (MS) associated with oxidative stress and low-grade inflammatory state. We also studied the effect of Pioglitazone an insulin sensitizer, on the aortic wall and its surrounding PVAT, considering a bi-directional communication between both layers...
February 21, 2018: Cardiovascular Therapeutics
Alexandre Caron, Syann Lee, Joel K Elmquist, Laurent Gautron
Interactions between the brain and distinct adipose depots have a key role in maintaining energy balance, thereby promoting survival in response to metabolic challenges such as cold exposure and starvation. Recently, there has been renewed interest in the specific central neuronal circuits that regulate adipose depots. Here, we review anatomical, genetic and pharmacological studies on the neural regulation of adipose function, including lipolysis, non-shivering thermogenesis, browning and leptin secretion. In particular, we emphasize the role of leptin-sensitive neurons and the sympathetic nervous system in modulating the activity of brown, white and beige adipose tissues...
February 16, 2018: Nature Reviews. Neuroscience
Ngoc Ly T Nguyen, Bingzhong Xue, Timothy J Bartness
White adipose tissue (WAT) and brown adipose tissue (BAT) have sympathetic nervous system (SNS) and sensory innervations. Previous studies from our laboratory revealed central neuroanatomical evidence of WAT sensory and BAT SNS crosstalk with double labeling of inguinal WAT (IWAT) sensory and interscapular BAT (IBAT) SNS neurons. We previously demonstrated that WAT lipolysis increases IBAT temperature, but this effect is absent when IWAT afferents are surgically denervated, which severs both sensory and SNS nerves...
February 12, 2018: Physiology & Behavior
Peng Zhao, Kai In Wong, Xiaoli Sun, Shannon M Reilly, Maeran Uhm, Zhongji Liao, Yuliya Skorobogatko, Alan R Saltiel
The noncanonical IKK family member TANK-binding kinase 1 (TBK1) is activated by pro-inflammatory cytokines, but its role in controlling metabolism remains unclear. Here, we report that the kinase uniquely controls energy metabolism. Tbk1 expression is increased in adipocytes of HFD-fed mice. Adipocyte-specific TBK1 knockout (ATKO) attenuates HFD-induced obesity by increasing energy expenditure; further studies show that TBK1 directly inhibits AMPK to repress respiration and increase energy storage. Conversely, activation of AMPK under catabolic conditions can increase TBK1 activity through phosphorylation, mediated by AMPK's downstream target ULK1...
February 8, 2018: Cell
Lauriane Bougaret, Laetitia Delort, Hermine Billard, Camille Le Huede, Céline Boby, Anne De la Foye, Adrien Rossary, Ali Mojallal, Odile Damour, Céline Auxenfans, Marie Paule Vasson, Florence Caldefie-Chezet
BACKGROUND: Obesity is a well-known risk factor of breast cancer in post-menopausal women that also correlates with a diminished therapeutic response. The influence of adipocytes and their secretome, i.e. adipokines, on the efficacy of hormone therapy has yet to be elucidated. METHODS: We investigated, ex vivo, whether mature adipocytes, differentiated from adipose stem cells of normal-weight (MA20) or obese (MA30) women, and their secretions, were able to counteract the effects of tamoxifen (Tx) which is known to decrease neoplastic cell proliferation...
2018: PloS One
Lin Chang, Wenhao Xiong, Xiangjie Zhao, Yanbo Fan, Yanhong Guo, Minerva Garcia-Barrio, Jifeng Zhang, Zhisheng Jiang, Jiandie D Lin, Y Eugene Chen
Background -The perivascular adipose tissue (PVAT), surrounding vessels, constitutes a distinct functional integral layer of the vasculature required to preserve vascular tone under physiological conditions. However, there is little information regarding the relationship between PVAT and blood pressure regulation, including its potential contributions to circadian blood pressure variation. Methods -Using unique brown adipocyte-specific aryl hydrocarbon receptor nuclear translocator-like protein 1 (Bmal1) and angiotensinogen (Agt) knock out mice we determined the vasoactivity of homogenized PVAT in aortic rings and how brown-adipocyte peripheral expression of Bmal1 and Agt in PVAT regulate the amplitude of diurnal change in blood pressure in mice...
January 25, 2018: Circulation
Yan Tian, Jia Xu, Xiao Du, Xianghui Fu
Noncoding RNAs (ncRNAs), including microRNAs, long noncoding RNAs and circular RNAs, regulate various biological processes and are involved in the initiation and progression of human diseases. Insulin, a predominant hormone secreted from pancreatic β cells, is an essential factor in regulation of systemic metabolism through multifunctional insulin signaling. Insulin production and action are tightly controlled. Dysregulations of insulin production and action can impair metabolic homeostasis, and eventually lead to the development of multiple metabolic diseases, especially diabetes...
January 22, 2018: Cancer Letters
Min-Hsiung Pan, Jia-Ching Wu, Chi-Tang Ho, Ching-Shu Lai
Obesity is a current global epidemic that has led to a marked increase in metabolic diseases. However, its treatment remains a challenge. Obesity is a multifactorial disease, which involves the dysfunction of neuropeptides, hormones, and inflammatory adipokines from the brain, gut, and adipose tissue. An understanding of the mechanisms and signal interactions in the crosstalk between organs and tissue in the coordination of whole-body energy metabolism would be helpful to provide therapeutic and putative approaches to the treatment and prevention of obesity and related complications...
January 5, 2018: BioFactors
Jong Hun Kim, Eunjung Lee, Randall H Friedline, Sujin Suk, Dae Young Jung, Sezin Dagdeviren, Xiaodi Hu, Kunikazu Inashima, Hye Lim Noh, Jung Yeon Kwon, Aya Nambu, Jun R Huh, Myoung Sook Han, Roger J Davis, Amy S Lee, Ki Won Lee, Jason K Kim
Obesity-mediated inflammation is a major cause of insulin resistance, and macrophages play an important role in this process. The 78-kDa glucose-regulated protein (GRP78) is a major endoplasmic reticulum chaperone that modulates unfolded protein response (UPR), and mice with GRP78 heterozygosity were resistant to diet-induced obesity. Here, we show that mice with macrophage-selective ablation of GRP78 (Lyz-GRP78-/-) are protected from skeletal muscle insulin resistance without changes in obesity compared with wild-type mice after 9 wk of high-fat diet...
December 14, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Raquel Costa-Almeida, Dominika Berdecka, Márcia T Rodrigues, Rui L Reis, Manuela E Gomes
Poor clinical outcomes of tendon repair, together with limited regenerative capacity of the tissue, have triggered the search for alternative regenerative medicine strategies. Human adipose-derived stem cells (hASCs) are being investigated as a promising cell source in contributing for tendon repopulation and reconstruction. However, the mechanisms involved in a potential beneficial effect in tendon regeneration are still to be uncovered. To gain further insights on the bi-directional crosstalk occurring between stem cells and the native tendon niche, it was used an indirect (trans-well) system for co-culturing human tendon explants and hASCs...
April 2018: Journal of Cellular Biochemistry
Raquel Costa-Almeida, Isabel Calejo, Rui L Reis, Manuela E Gomes
Tendon injuries constitute an unmet clinical challenge owing to the limited intrinsic regenerative ability of this tissue. Cell-based therapies aim at improving tendon healing through the delicate orchestration of tissue rebuilding and regain of function. Hence, human adipose-derived stem cells (hASCs) have been proposed as a promising cell source for boosting tendon regeneration. In this work, we investigated the influence of hASCs on native human tendon-derived cells (hTDCs) through the establishment of a direct contact co-culture system...
December 7, 2017: Journal of Cellular Physiology
Laura M Bond, James M Ntambi
Uncoupling protein-1 (UCP1) facilitates thermogenesis in brown and beige adipocytes and can promote energy expenditure by decreasing mitochondrial respiratory efficiency. Defects in UCP1 and brown adipose tissue thermogenesis subject animals to chronic cold stress and elicit compensatory responses to generate heat. How UCP1 regulates white adipose tissue (WAT) lipid biology and tissue crosstalk is not completely understood. Here, we probed the effect of UCP1 deficiency on FA metabolism in inguinal and epididymal WAT and investigated how these metabolic perturbations influence hepatic lipid homeostasis...
February 2018: Journal of Lipid Research
Qingzhang Zhu, Philipp E Scherer
Excess adiposity can induce adverse sequelae in multiple cell types and organ systems. The transition from the lean to the obese state is characterized by fundamental cellular changes at the level of the adipocyte. These changes affect the local microenvironment within the respective adipose tissue but can also affect nonadipose systems. Adipocytes within fat pads respond to chronic nutrient excess through hyperplasia or hypertrophy, which can differentially affect interorgan crosstalk between various adipose depots and other organs...
February 2018: Nature Reviews. Nephrology
Lucía Robado de Lope, Olwen Leaman Alcíbar, Ana Amor López, Marta Hergueta-Redondo, Héctor Peinado
During metastasis, tumour cells must communicate with their microenvironment by secreted soluble factors and extracellular vesicles. Different stromal cell types (e.g. bone marrow-derived cells, endothelial cells and fibroblasts) influence the growth and progression of tumours. In recent years, interest has extended to other cell types in the tumour microenvironment such as adipocytes and adipose tissue-derived mesenchymal stem cells. Indeed, obesity is becoming pandemic in some developing countries and it is now considered to be a risk factor for cancer progression...
January 5, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Hui Zhao, Qianwen Shang, Zhenzhen Pan, Yang Bai, Zequn Li, Huiying Zhang, Qiu Zhang, Chun Guo, Lining Zhang, Qun Wang
Adipose-derived stem cells (ADSCs) play critical roles in controlling obesity-associated inflammation and metabolic disorders. Exosomes from ADSCs exert protective effects in several diseases, but their roles in obesity and related pathological conditions remain unclear. Here we showed that treatment of obese mice with ADSC-derived exosomes facilitated their metabolic homeostasis including improved insulin sensitivity (27.8% improvement), reduced obesity and alleviated hepatic steatosis. ADSC-derived exosomes drove M2 macrophage polarization, inflammation reduction and beiging in white adipose tissues (WAT) of diet-induced obese mice...
November 13, 2017: Diabetes
O Dikker, S Bekpinar, Gul Ozdemirler, Mujdat Uysal, Muberra Vardar, Sevgi Atar, Murat Usta, Berrin Huner
Introduction Crosstalk between bone and adipose tissues is implicated in several pathologic conditions related to bone metabolism. Omentin-1, a 34-kD protein, is released from omental adipose tissue. A few studies indicated the effect of omentin-1 on bone health and bone mineral density (BMD) and the interaction of omentin-1 with vitamin D. Therefore, this study aimed to investigate the relationship between omentin-1, vitamin D, and BMD in postmenopausal women with osteoporosis compared with non-osteoporotic counterparts...
November 8, 2017: Experimental and Clinical Endocrinology & Diabetes
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