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Perilipin

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https://www.readbyqxmd.com/read/29150696/impact-of-prolonged-overfeeding-on-skeletal-muscle-mitochondria-in-healthy-individuals
#1
Frederico G S Toledo, Darcy L Johannsen, Jeffrey D Covington, Sudip Bajpeyi, Bret Goodpaster, Kevin E Conley, Eric Ravussin
AIMS/HYPOTHESES: Reduced mitochondrial capacity in skeletal muscle has been observed in obesity and type 2 diabetes. In humans, the aetiology of this abnormality is not well understood but the possibility that it is secondary to the stress of nutrient overload has been suggested. To test this hypothesis, we examined whether sustained overfeeding decreases skeletal muscle mitochondrial content or impairs function. METHODS: Twenty-six healthy volunteers (21 men, 5 women, age 25...
November 17, 2017: Diabetologia
https://www.readbyqxmd.com/read/29137982/adipose-tissue-complement-factor-b-promotes-adipocyte-maturation
#2
Hiroaki Matsunaga, Misaki Iwashita, Takanori Shinjo, Akiko Yamashita, Mitsudai Tsuruta, Shoichiro Nagasaka, Ataru Taniguchi, Mitsuo Fukushima, Naoya Watanabe, Fusanori Nishimura
OBJECTIVES: It is well-known that the complement system plays an essential role in host immunity. Observational studies have indicated that complement system-related molecules such as complement factor B (CfB) and other components are correlated with obesity and/or insulin resistance parameters. In this study, we investigated the role of adipocyte-derived CfB in adipose tissue metabolism. METHODS: We investigated the expression level of complement system-related genes in adipocytes...
November 11, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29118433/visualization-of-lipid-directed-dynamics-of-perilipin-1-in-human-primary-adipocytes
#3
Jesper S Hansen, Sofia de Maré, Helena A Jones, Olga Göransson, Karin Lindkvist-Petersson
Perilipin 1 is a lipid droplet coating protein known to regulate lipid metabolism in adipocytes by serving as a physical barrier as well as a recruitment site for lipases to the lipid droplet. Phosphorylation of perilipin 1 by protein kinase A rapidly initiates lipolysis, but the detailed mechanism on how perilipin 1 controls lipolysis is unknown. Here, we identify specific lipid binding properties of perilipin 1 that regulate the dynamics of lipolysis in human primary adipocytes. Cellular imaging combined with biochemical and biophysical analyses demonstrate that perilipin 1 specifically binds to cholesteryl esters, and that their dynamic properties direct segregation of perilipin 1 into topologically distinct micro domains on the lipid droplet...
November 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29118419/melatonin-promotes-triacylglycerol-accumulation-via-mt2-receptor-during-differentiation-in-bovine-intramuscular-preadipocytes
#4
Wucai Yang, Keqiong Tang, Yaning Wang, Yingying Zhang, Linsen Zan
Melatonin (N-acetyl-5-methoxytryptamine) is a derivative of tryptophan which is produced and secreted mainly by the pineal gland and regulates a variety of important central and peripheral actions. To examine the potential effects of melatonin on the proliferation and differentiation of bovine intramuscular preadipocytes (BIPs), BIPs were incubated with different concentrations of melatonin. Melatonin supplementation at 1 mM significantly increased peroxisome proliferator-activated receptor γ (PPARγ), CCAAT/enhancer-binding protein (C/EBP) β, and C/EBPα expression and promoted the differentiation of BIPs into adipocytes with large lipid droplets and high cellular triacylglycerol (TAG) levels...
November 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29110300/dissociation-of-intramyocellular-lipid-storage-and-insulin-resistance-in-trained-athletes-and-type-2-diabetes-patients-involvement-of-perilipin-5
#5
Anne Gemmink, Sabine Daemen, Bram Brouwers, Peter R Huntjens, Gert Schaart, Esther Moonen-Kornips, Johanna Jörgensen, Joris Hoeks, Patrick Schrauwen, Matthijs K C Hesselink
Intramyocellular lipids (IMCL) hamper insulin sensitivity albeit not in endurance-trained athletes (Trained). Compared to type 2 diabetes patients (T2DM), Trained subjects have high levels of Perilipin 5 (PLIN5). Here, we tested if the fraction of PLIN5 coated LDs is a determinant of skeletal muscle insulin sensitivity and contributes to the athlete's paradox. Muscle biopsies were taken from 8 Trained, Lean sedentary, Obese and T2DM subjects. Trained, Obese and T2DM subjects were matched for total IMCL content...
November 7, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29102029/-tetrandrine-has-anti-adipogenic-effect-on-3t3-l1-preadipocytes-through-the-reduced-expression-and-or-phosphorylation-levels-of-c-ebp-%C3%AE-ppar-%C3%AE-fas-perilipin-a-and-stat-3-biochem-biophys-res-%C3%A2-commun-476-4-2016-481-486
#6
https://www.readbyqxmd.com/read/29094660/investigation-of-the-perilipin-5-gene-expression-and-association-study-of-its-sequence-polymorphism-with-meat-and-carcass-quality-traits-in-different-pig-breeds
#7
M Zappaterra, M Mazzoni, P Zambonelli, R Davoli
The growing request for healthier fatty acid composition of animal products is raising the necessity of a deeper knowledge of the main factors controlling fatty acids storage in muscle and backfat. Perilipin (PLIN) 5, and the whole Perilipin family, seem to play a crucial role in the regulation of lipids deposition as code for proteins coating intracellular lipid droplets surface. Nevertheless, the knowledge of these genes in pig is still incomplete. The present research was aimed at investigating in different pig breeds the PLIN5 gene, analysing its expression level and the associations of the variability in its downstream gene region with pork meat and carcass quality traits...
November 2, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/29090233/common-variations-in-perilipin-rs1052700-and-fto-rs3751812-gene-variants-and-risk-for-obesity-and-type-2-diabetes
#8
Ramin Saravani, Hamid Reza Galavi, Nafiseh Noorzehi, Nasrin Ranjbar, Fatemeh Mollashahee-Kohkan
BACKGROUND: Perilipins are proteins that coat lipid globules in adipocytes, which are steroid-generating cells that play a central role in lipid storage and breakdown. The FTO gene is associated with type-2 diabetes (T2D) and increased fat mass. In this work the association of perilipin and FTO gene polymorphisms in T2D was investigated. METHODS: One hundred eighty-three Iranian men and women with T2D, and 174 healthy controls with no known metabolic diseases, participated in the study...
October 2017: Reports of Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/29066463/angiotensin-1-7-stimulates-brown-adipose-tissue-and-reduces-diet-induced-obesity
#9
Hidechika Morimoto, Jun Mori, Hisakazu Nakajima, Yasuhiro Kawabe, Yusuke Tsuma, Shota Fukuhara, Kazuki Kodo, Kazuya Ikoma, Satoaki Matoba, Gavin Y Oudit, Hajime Hosoi
The renin-angiotensin system is a key regulator of metabolism with beneficial effects of the angiotensin 1-7 peptide. We hypothesized that the anti-obesity effect of Ang 1-7 is related to the stimulation of brown adipose tissue (BAT). We administered Ang 1-7 (0.54 mg・kg(-1)・d(-1)) for 28 days via implanted micro-osmotic pumps to mice with high-fat diet (HFD) induced obesity. Ang 1-7 treatment reduced body weight, upregulated thermogenesis and ameliorated impaired glucose homeostasis without affecting food consumption...
October 24, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29058774/mesoderm-specific-transcript-localization-in-the-er-and-er-lipid-droplet-interface-supports-a-role-in-adipocyte-hypertrophy
#10
Igor Prudovsky, Rea P Anunciado-Koza, Chester G Jacobs, Doreen Kacer, Matthew E Siviski, Robert A Koza
Highly variable expression of mesoderm specific transcript (Mest) in adipose tissue among genetically homogeneous mice fed an obesogenic diet, and its positive association with fat mass expansion, suggests that Mest is an epigenetic determinant for the development of obesity. Although the mechanisms by which MEST augments fat accumulation in adipocytes have not been elucidated, it has sequence homology and catalytic peptide motifs which suggests that it functions as an epoxide hydrolase or as a glycerol- or acylglycerol-3-phosphate acyltransferase...
October 23, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29045046/a-novel-mouse-cre-driver-line-targeting-perilipin-2-expressing-cells-in-the-neonatal-lung
#11
Aglaia Ntokou, Marten Szibor, José Alberto Rodríguez-Castillo, Jennifer Quantius, Susanne Herold, Elie El Agha, Saverio Bellusci, Isabelle Salwig, Thomas Braun, Robert Voswinckel, Werner Seeger, Rory E Morty, Katrin Ahlbrecht
Pulmonary diseases such as chronic obstructive pulmonary disease, lung fibrosis, and bronchopulmonary dysplasia are characterized by the destruction or malformation of the alveolar regions of the lung. The underlying pathomechanisms at play are an area of intense interest since these mechanisms may reveal pathways suitable for interventions to drive reparative processes. Lipid-laden fibroblasts (lipofibroblasts) express the Perilipin 2 (Plin2) gene-product, PLIN2, commonly called adipose-differentiation related protein (ADRP)...
October 16, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/29037825/vitamin-d-prevents-lipid-accumulation-in-murine-muscle-through-regulation-of-ppar%C3%AE-and-perilipin-2-expression
#12
Jiarong Li, Milton Mihalcioiu, Lifeng Li, Mahvash Zakikhani, Anne Camirand, Richard Kremer
Vitamin D plays an important role in regulation of skeletal muscle tone and contraction. Serum vitamin D status is linked to muscle power and force in adolescent girls, and vitamin D deficiency is associated with myopathies in children and poorer physical performance in the elderly. We previously reported that vitamin D deficiency is linked to a significant increase in muscle fatty infiltration in healthy young women, and studies in patients with neuromuscular disorders also associate muscle weakening and lipid content...
October 13, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29031005/quantitative-high-content-high-throughput-microscopy-analysis-of-lipid-droplets-in-subject-specific-adipogenesis-models
#13
Maxime Bombrun, Hui Gao, Petter Ranefall, Niklas Mejhert, Peter Arner, Carolina Wählby
Neutral lipids packed in lipid droplets (LDs) are essential as a source of fuel for organisms, and specialized storing cells, the adipocytes, provide a buffer for energy variations. Many modern-society-disorders are connected with excess accumulation or deficiency of LDs in adipose tissue. Intracellular LD number and size distribution reflect the tissue conditions, while the associated mechanisms and genes rs are still poorly understood. Large-scale genetic screens using human in vitro differentiated primary adipocytes require cell samples donated from many patients...
October 14, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/29030246/interaction-of-a-model-apolipoprotein-apolp-iii-with-an-oil-phospholipid-interface
#14
Mona Mirheydari, Elizabeth K Mann, Edgar E Kooijman
Lipid droplets are "small" organelles that play an important role in de novo synthesis of new membrane, and steroid hormones, as well as in energy storage. The way proteins interact specifically with the oil-(phospho-)lipid monolayer interface of lipid droplets is a relatively unexplored but crucial question. Here, we use our home built liquid droplet tensiometer to mimic intracellular lipid droplets and study protein-lipid interactions at this interface. As model neutral lipid binding protein, we use apoLp-III, an amphipathic α-helix bundle protein...
October 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29016744/novel-effects-of-dapagliflozin-on-epicardial-adipose-tissue-with-insulin-resistance-high-levels-of-inflammatory-chemokines-production-and-low-differentiation-ability
#15
Esther Díaz-Rodríguez, Rosa M Agra, Ángel L Fernández, B Adrio, Tomás García-Caballero, José R González-Juanatey, Sonia Eiras
Aims: In patients with cardiovascular disease, epicardial adipose tissue (EAT) is characterized by insulin resistance, high pro-inflammatory chemokines and low differentiation ability. Since dapagliflozin reduces body fat and cardiovascular events in diabetic patients, we wanted to know its effect on EAT and subcutaneous adipose tissue (SAT). Methods and results: Adipose samples were obtained from 52 patients undergoing heart surgery. Sodium-glucose cotransporter 2 (SGLT2) expression was determined by real time PCR (n = 20), Western blot and immunohistochemistry...
September 11, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28980208/calcitriol-concomitantly-enhances-insulin-sensitivity-and-alters-myocellular-lipid-partitioning-in-high-fat-treated-skeletal-muscle-cells
#16
Grace E Jefferson, David M Schnell, D Travis Thomas, Lance M Bollinger
Vitamin D reduces myocellular insulin resistance, but the effects of vitamin D on intramyocellular lipid (IMCL) partitioning are unknown. The purpose of this study was to understand how calcitriol, the active vitamin D metabolite, affects insulin sensitivity and lipid partitioning in skeletal muscle cells. C2C12 myotubes were treated with calcitriol (100 nM) or vehicle control for 96 h. Insulin-stimulated Akt phosphorylation (Thr 308) was determined by western blot. Intramyocellular triacylglycerol (IMTG), diacylglycerol (DAG), and ceramide content were measured by LC/MS...
November 2017: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28953247/anti-adipogenic-effects-on-3t3-l1-cells-and-zebrafish-by-tanshinone-iia
#17
Yu-Kyoung Park, Brice Wilfried Obiang-Obounou, Jinho Lee, Tae-Yun Lee, Myung-Ae Bae, Kyu-Seok Hwang, Kyung-Bok Lee, Jong-Soon Choi, Byeong-Churl Jang
Tanshinone IIA is a diterpene quinone isolated from the roots of Salviamiltiorrhiza bunge that has traditionally been used in China for the treatment of cardiovascular and cerebrovascular disorders. Although there is recent evidence showing that tanshinone IIA has an anti-obesity effect, its underlying mechanism of anti-obesity effect is poorly understood. Here, we investigated the effect of tanshinone IIA on lipid accumulation in 3T3-L1 preadipocytes and zebrafish. Notably, tanshinone IIA at 10 μM concentration greatly reduced lipid accumulation and triglyceride (TG) contents during 3T3-L1 preadipocyte differentiation, suggesting its anti-adipogenic effect...
September 27, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28951592/ethanol-triggered-lipophagy-requires-sqstm1-in-aml12-hepatic-cells
#18
Lin Wang, Jun Zhou, Shengmin Yan, Guangsheng Lei, Chao-Hung Lee, Xiao-Ming Yin
Ethanol-induced hepatic lipophagy plays an important cytoprotective role against liver injury, but its mechanism is not fully determined. In the present study, ethanol-induced lipophagy was studied in an immortalized mouse hepatocyte line, AML12. We found that ethanol treatment elevated lipid content in these cells, which could be regulated by autophagy. To determine the potential mechanism, we investigated the role of a key adaptor molecule SQSTM1/p62. SQSTM1 can bind to LC3 on autophagosomes and ubiquitinated molecules on cargos, thus facilitating the autophagic engulfment of the cargo...
September 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28934090/adipogenic-effects-and-gene-expression-profiling-of-firemaster%C3%A2-550-components-in-human-primary-preadipocytes
#19
Emily W Y Tung, Vian Peshdary, Remi Gagné, Andrea Rowan-Carroll, Carole L Yauk, Adéle Boudreau, Ella Atlas
BACKGROUND: Exposure to flame retardants has been associated with negative health outcomes including metabolic effects. As polybrominated diphenyl ether flame retardants were pulled from commerce, human exposure to new flame retardants such as Firemaster® 550 (FM550) has increased. Although previous studies in murine systems have shown that FM550 and its main components increase adipogenesis, the effects of FM550 in human models have not been elucidated. OBJECTIVES: The objectives of this study were to determine if FM550 and its components are active in human preadipocytes, and to further investigate their mode of action...
September 14, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28928235/testosterone-protects-high-fat-low-carbohydrate-diet-induced-non-alcoholic-fatty-liver-disease-in-castrated-male-rats-mainly-via-modulating-er-stress
#20
Yue Jia, Jennifer Kuang Yee, Christina Wang, Liana Nikolaenko, Maruja Diaz-Arjonilla, Joshua N Cohen, Samuel W French, Peter Y Liu, YanHe Lue, Wai-Nang Paul Lee, Ronald S Swerdloff
We previously showed that testosterone (T) deficiency enhanced high-fat diet (HFD) induced hepatic steatosis in rats that was independent of insulin resistance, and that T replacement reduced hepatic macrovesicular fat accumulation and inflammation. The present report explores the mechanism of T-protective effects on HFD-induced steatohepatitis. Adult male rats were randomized into four treatment groups for 15 weeks (intact rats on regular chow diet or HFD, and castrated rats on HFD with/without T replacement)...
September 19, 2017: American Journal of Physiology. Endocrinology and Metabolism
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