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https://www.readbyqxmd.com/read/28938465/serum-insulin-bioassay-reflects-insulin-sensitivity-and-requirements-in-type-1-diabetes
#1
Joseph A M J L Janssen, Gemma Llauradó, Aimee J Varewijck, Per-Henrik Groop, Carol Forsblom, Sonia Fernández-Veledo, Elisabeth S R van den Dungen, Joan Vendrell, Leo J Hofland, Hannele Yki-Järvinen
Background: Insulin resistance could increase insulin requirements in type 1 diabetes (TD1). Current insulin immunoassays do not detect insulin analogues. Kinase Insulin Receptor Activation (KIRA) bioassays specific for human insulin receptor isoforms A and B (IR-A and IR-B) permit assessment of all circulating insulin bioactivity. We studied whether IR-A and IR-B KIRA assays are related to direct measures of insulin sensitivity or insulin doses in TD1. Methods: We evaluated 31 adult patients with TD1 (age 45...
August 14, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28937704/a-high-concentration-of-fatty-acids-induces-tnf-%C3%AE-as-well-as-no-release-mediated-by-the-p2x4-receptor-and-the-protective-effects-of-puerarin-in-raw264-7-cells
#2
Yun-Ming Tu, Cheng-Xin Gong, Lu Ding, Xing-Zi Liu, Tao Li, Fang-Fang Hu, Shuo Wang, Chao-Peng Xiong, Shang-Dong Liang, Hong Xu
Circulating levels of free fatty acids (FFAs) are often found to be increased in patients with type 2 diabetes mellitus (T2DM) and metabolic syndrome (MS). High plasma FFA levels may give rise to maladaptive macrophage activation and promote inflammatory responses, which has been proposed as a potential mechanism for the development of DM and MS. P2X4 receptor (P2X4R), a ligand-gated cation channel activated by extracellular adenosine triphosphate (ATP), plays a primary role in the regulation of inflammatory responses...
September 22, 2017: Food & Function
https://www.readbyqxmd.com/read/28933568/seasonal-variation-in-plasma-lipids-and-lipases-in-young-healthy-humans
#3
Trinitat Cambras, Juan A Baena-Fustegueras, Eva Pardina, David Ricart-Jané, Joana Rossell, Antoni Díez-Noguera, Julia Peinado-Onsurbe
Although intermediate metabolism is known to follow circadian rhythms, little information is available on the variation in lipase activities (lipoprotein and hepatic lipase, LPL and HL, respectively) and lipids throughout the year. In a cross-sectional study, we collected and analysed blood from 245 healthy students (110 men and 135 women) between 18 and 25 years old from the University of Barcelona throughout the annual campaign (March, May, October and December) of the blood bank. All subjects gave their written informed consent to participate...
September 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28932068/familial-cicatricial-alopecia-report-of-familial-frontal-fibrosing-alopecia-and-fibrosing-alopecia-in-a-pattern-distribution
#4
Dandara Meurer Missio, Maria Fernanda Reis Gavazzoni Dias, Ralph Michel Trüeb
Frontal fibrosing alopecia (FFA) and fibrosing alopecia in a pattern distribution (FAPD) as originally reported by Kossard in 1994 and by Zinkernagel and Trüeb in 2000, respectively, represent two distinct patterns of cicatricial pattern hair loss. Both share a patterned distribution and histological evidence of a lichenoid follicular inflammation with fibrosis. FFA is characterized by a marginal alopecia along the frontotemporal hairline, and FAPD by a progressive alopecia of the centroparietal scalp. Since the original reports, evidence has accumulated that there exists considerable clinical overlap among FFA, FAPD, and lichen planopilaris, with coexistence of features of the three conditions within the same individual...
July 2017: International Journal of Trichology
https://www.readbyqxmd.com/read/28930674/a-protein-scaffold-coordinates-src-mediated-jnk-activation-in-response-to-metabolic-stress
#5
Shashi Kant, Claire L Standen, Caroline Morel, Dae Young Jung, Jason K Kim, Wojciech Swat, Richard A Flavell, Roger J Davis
Obesity is a major risk factor for the development of metabolic syndrome and type 2 diabetes. How obesity contributes to metabolic syndrome is unclear. Free fatty acid (FFA) activation of a non-receptor tyrosine kinase (SRC)-dependent cJun NH2-terminal kinase (JNK) signaling pathway is implicated in this process. However, the mechanism that mediates SRC-dependent JNK activation is unclear. Here, we identify a role for the scaffold protein JIP1 in SRC-dependent JNK activation. SRC phosphorylation of JIP1 creates phosphotyrosine interaction motifs that bind the SH2 domains of SRC and the guanine nucleotide exchange factor VAV...
September 19, 2017: Cell Reports
https://www.readbyqxmd.com/read/28919422/over-expression-of-ppar%C3%AE-in-obese-mice-adipose-tissue-improves-insulin-sensitivity
#6
Haruya Takahashi, Kohei Sanada, Hiroyuki Nagai, Yongjia Li, Yumeko Aoki, Takeshi Ara, Shigeto Seno, Hideo Matsuda, Rina Yu, Teruo Kawada, Tsuyoshi Goto
Peroxisome proliferator-activated receptor α (PPARα) is important in the regulation of lipid metabolism and expressed at high levels in the liver. Although PPARα is also expressed in adipose tissue, little is known about the relationship between its activation and the regulation of glucose metabolism. In this study, we developed adipose tissue specific PPARα over-expression (OE) mice. Metabolomics and insulin tolerance tests showed that OE induces branched-chain amino acid (BCAA) profile and improvement of insulin sensitivity...
September 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28914377/the-permeability-enhancing-mechanism-of-menthol-on-skin-lipids-a-molecular-dynamics-simulation-study
#7
Huanjie Wang, Fancui Meng
The stratum corneum (SC), the outermost layer of skin, represents the primary barrier to molecules penetrating the skin. Menthol is widely used in clinical medicine as a penetration enhancer due to its high efficiency and relative safety. In this study, molecular dynamics simulations have been performed to investigate the effect of menthol molecules on the structural and permeability of both single component and ternary mixed bilayers. The lipid matrix is modeled as pure ceramide (CER2) or as a 2:2:1 mixture of CER2, cholesterol (CHOL), and free fatty acid (FFA)...
September 15, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28898884/effects-of-mucuna-pruriens-on-free-fatty-acid-levels-and-histopathological-changes-in-the-brains-of-rats-fed-a-high-fructose-diet
#8
Bekir Akgun, Aysel Sarı, Sait Ozturk, Fatih Serhat Erol, Ibrahim Hanifi Ozercan, Ramazan Ulu
OBJECTIVE: To investigate free fatty acid levels and histopathologic changes in the brain of rats fed a high fructose diet and to evaluate the effects of Mucuna pruriens, known to have antidiabetic activity, on these changes. MATERIALS AND METHODS: The study comprised of 28 mature female Wistar rats. The rats were divided into four groups, each included 7 rats. Group 1: control; Group 2: fed a high fructose diet (HFrD), Group 3: fed normal rat chow and Mucuna pruriens, and Group 4: fed a high fructose diet and Mucuna pruriens for 6 weeks...
September 11, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/28898202/toll-like-receptor-4-tlr4-deficient-mice-are-protected-from-adipose-tissue-inflammation-in-aging
#9
Amiya K Ghosh, Martin O'Brien, Theresa Mau, Raymond Yung
Adipose tissue (AT) inflammation is a central mechanism for metabolic dysfunction in both diet-induced obesity and age-associated obesity. Studies in diet-induced obesity have characterized the role of Fetuin A (Fet A) in Free Fatty Acids (FFA)-mediated TLR4 activation and adipose tissue inflammation. However, the role of Fet A & TLR4 in aging-related adipose tissue inflammation is unknown. In the current study, analysis of epidymymal fat pads of C57/Bl6 male mice, we found that, in contrast to data from diet-induced obesity models, adipose tissue from aged mice have normal Fet A and TLR4 expression...
September 7, 2017: Aging
https://www.readbyqxmd.com/read/28894049/the-pathophysiological-basis-of-the-protective-effects-of-metformin-in-heart-failure
#10
Aleksandra Dziubak, Grażyna Wójcicka
Metformin, currently recommended as the drug of first choice in type 2 diabetes mellitus (T2DM), is one of the few antihiperglycemic drugs to reduce cardiovascular risk. Nonetheless, due to the risk of lactic acidosis during metformin therapy, its usage in patients with diabetes and heart failure (HF) is still a matter of debate. The aim of this review is to present data supporting the possibility of using metformin in the treatment of diabetic patients with concomitant heart failure. In the failing heart, metformin through the mechanism related to AMP-activated protein kinase (AMPK) activity, improves free fatty acids (FFA) and glucose metabolism, mitochondrial biogenesis, as well as nitric oxide (NO)-NO synthase pathway...
August 24, 2017: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28887535/metabolic-stress-induced-cardiomyopathy-is-caused-by-mitochondrial-dysfunction-due-to-attenuated-erk5-signaling
#11
Wei Liu, Andrea Ruiz-Velasco, Shoubao Wang, Saba Khan, Min Zi, Andreas Jungmann, Maria Dolores Camacho-Muñoz, Jing Guo, Guanhua Du, Liping Xie, Delvac Oceandy, Anna Nicolaou, Gina Galli, Oliver J Müller, Elizabeth J Cartwright, Yong Ji, Xin Wang
The prevalence of cardiomyopathy from metabolic stress has increased dramatically; however, its molecular mechanisms remain elusive. Here, we show that extracellular signal-regulated protein kinase 5 (Erk5) is lost in the hearts of obese/diabetic animal models and that cardiac-specific deletion of Erk5 in mice (Erk5-CKO) leads to dampened cardiac contractility and mitochondrial abnormalities with repressed fuel oxidation and oxidative damage upon high fat diet (HFD). Erk5 regulation of peroxisome proliferator-activated receptor γ co-activator-1α (Pgc-1α) is critical for cardiac mitochondrial functions...
September 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28884505/alternative-oils-tested-as-feedstocks-for-enzymatic-fames-synthesis-towards-a-more-sustainable-process
#12
Belén Infanzón, Silvia Cesarini, Josefina Martínez, F I Javier Pastor, Pilar Diaz
Previously isolated and characterized Pseudomonas lipases were immobilized in a low-cost MP-1000 support by a re-loading procedure that allowed a high activity per weight of support. Immobilized LipA, LipC and LipCmut lipases, and commercial Novozym® 435 were tested for fatty acid methyl ester (FAMEs) synthesis using conventional and alternative feedstocks. Triolein and degummed soybean oils were used as model substrates, whereas waste cooking oil and M. circinelloides oil were assayed as alternative, low cost feedstocks, whose free fatty acid (FFA) and acylglyceride profile was characterized...
September 7, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28883917/betaine-affects-muscle-lipid-metabolism-via-regulating-the-fatty-acid-uptake-and-oxidation-in-finishing-pig
#13
Sisi Li, Haichao Wang, Xinxia Wang, Yizhen Wang, Jie Feng
BACKGROUND: Betaine affects fat metabolism in animals, but the specific mechanism is still not clear. The purpose of this study was to investigate possible mechanisms of betaine in altering lipid metabolism in muscle tissue in finishing pigs. METHODS: A total of 120 crossbred gilts (Landrace × Yorkshire × Duroc) with an average initial body weight of 70.1 kg were randomly allotted to three dietary treatments. The treatments included a corn-soybean meal basal diet supplemented with 0, 1250 or 2500 mg/kg betaine...
2017: Journal of Animal Science and Biotechnology
https://www.readbyqxmd.com/read/28883211/cide-family-mediated-unique-lipid-droplet-morphology-in-white-adipose-tissue-and-brown-adipose-tissue-determines-the-adipocyte-energy-metabolism
#14
Yuki Nishimoto, Yoshikazu Tamori
White adipose tissue (WAT) stores energy as triacylglycerol in preparation for fasting state. In contrast, brown adipose tissue (BAT) consumes energy and produces heat in a cold environment. One of the major differences between these two adipose tissues is the morphology of the intracellular lipid droplet (LD), which is large and unilocular in WAT and small and multilocular in BAT. Although the fat-specific protein 27 alpha (FSP27α), belonging to the cell death-inducing DNA fragmentation factor A (DFFA)-like effector (Cide) family, was known to be indispensable for large unilocular LD formation in WAT, the mechanism that regulated small multilocular LD formation in BAT remained unknown...
September 5, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28882574/kupffer-cells-activation-promoted-binge-drinking-induced-fatty-liver-by-activating-lipolysis-in-white-adipose-tissues
#15
Yu-Ying Zhao, Rui Yang, Mo Xiao, Min-Jie Guan, Ning Zhao, Tao Zeng
Kupffer cells (KCs) have been suggested to play critical roles in chronic ethanol induced early liver injury, but the role of KCs in binge drinking-induced hepatic steatosis remains unclear. This study was designed to investigate the roles of KCs inhibitor (GdCl3) and TNF-α antagonist (etanercept) on binge drinking-induced liver steatosis and to explore the underlying mechanisms. C57BL/6 mice were exposed to three doses of ethanol (6g/kg body weight) to mimic binge drinking-induced fatty liver. The results showed that both GdCl3 and etanercept partially but significantly alleviated binge drinking-induced increase of hepatic triglyceride (TG) level, and reduced fat droplets accumulation in mice liver...
September 4, 2017: Toxicology
https://www.readbyqxmd.com/read/28879188/the-use-of-direct-immunofluorescence-in-frontal-fibrosing-alopecia
#16
Aline Donati, Aditya K Gupta, Carolina Jacob, Benedicte Cavelier-Balloy, Pascal Reygagne
BACKGROUND: Frontal fibrosing alopecia (FFA) differs from lichen planopilaris (LPP) in many clinical aspects, but histology fails to distinguish between these entities. Direct immunofluorescence (DIF) is a diagnostic technique used for autoimmune diseases, including those affecting skin and hair. OBJECTIVE: To characterize DIF patterns in patients with FFA. METHOD: Data was collected retrospectively from FFA cases presenting to the Centre de Santé Sabouraud Hair Clinic in Paris from November 2013 to November 2014...
August 2017: Skin Appendage Disorders
https://www.readbyqxmd.com/read/28877979/fatty-acids-promote-fatty-liver-disease-via-the-dysregulation-of-3-mercaptopyruvate-sulfurtransferase-hydrogen-sulfide-pathway
#17
Meng Li, Chengfu Xu, Junping Shi, Jiexia Ding, Xingyong Wan, Dahua Chen, Jianguo Gao, Chunxiao Li, Jie Zhang, Yiming Lin, Zhenhua Tu, Xiaoni Kong, Youming Li, Chaohui Yu
OBJECTIVE: Accumulation of free fatty acids (FFAs) in hepatocytes induces lipotoxicity, leading to non-alcoholic fatty liver disease (NAFLD). This study aimed to investigate the underlying mechanisms by which FFA contributes to the pathogenesis of NAFLD via the regulation of 3-mercaptopyruvate sulfurtransferase (MPST), a key enzyme that regulates endogenous hydrogen sulfide (H2S) biosynthesis. DESIGN: Hepatic MPST expression was evaluated in mice and patients with NAFLD...
September 6, 2017: Gut
https://www.readbyqxmd.com/read/28877220/attenuated-lipotoxicity-and-apoptosis-is-linked-to-exogenous-and-endogenous-augmenter-of-liver-regeneration-by-different-pathways
#18
Thomas S Weiss, Madeleine Lupke, Sara Ibrahim, Christa Buechler, Julia Lorenz, Petra Ruemmele, Ute Hofmann, Michael Melter, Rania Dayoub
Nonalcoholic fatty liver disease (NAFLD) covers a spectrum from simple steatosis to nonalcoholic steatohepatitis (NASH) and cirrhosis. Free fatty acids (FFA) induce steatosis and lipo-toxicity and correlate with severity of NAFLD. In this study we aimed to investigate the role of exogenous and endogenous ALR (augmenter of liver regeneration) for FFA induced ER (endoplasmatic reticulum) -stress and lipoapoptosis. Primary human hepatocytes or hepatoma cells either treated with recombinant human ALR (rhALR, 15kDa) or expressing short form ALR (sfALR, 15kDa) were incubated with palmitic acid (PA) and analyzed for lipo-toxicity, -apoptosis, activation of ER-stress response pathways, triacylglycerides (TAG), mRNA and protein expression of lipid metabolizing genes...
2017: PloS One
https://www.readbyqxmd.com/read/28874440/blocking-gp130-signaling-suppresses-autotaxin-expression-in-adipocytes-and-improves-insulin-sensitivity-in-diet-induced-obesity
#19
Shuhong Sun, Ran Wang, Jianwen Song, Ming Guan, Na Li, Xiaotian Zhang, Zhenwen Zhao, Junjie Zhang
Autotaxin (ATX), which is highly expressed and secreted by adipocytes, functions as the key enzyme to generate lysophosphatidic acid (LPA) from lysophosphatidylcholine (LPC). Adipose tissue is the main source of circulating ATX that modulates plasma LPA levels. Up-regulation of ATX expression in obese patients and mice is closely related with insulin resistance and impaired glucose tolerance. However, the mechanism of ATX expression in adipocytes remains largely unknown. In this study, we found that gp130-mediated JAK-STAT3 activation was required for abundant ATX expression in adipocytes...
September 5, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28870233/free-fatty-acids-profile-among-lean-overweight-and-obese-non-alcoholic-fatty-liver-disease-patients-a-case-control-study
#20
Rennan Feng, Chao Luo, Chunlong Li, Shanshan Du, Akinkunmi Paul Okekunle, Yanchuan Li, Yang Chen, Tianqi Zi, Yucun Niu
BACKGROUND: Non-alcoholic fatty liver disease (NAFLD) given its association with obesity and diabetes may perhaps exert distinct free fatty acids (FFA) pattern, but the understanding of this phenomenon is limited. To this effect, we evaluated FFA profiles among healthy subjects and NAFLD patients stratified by body weight, to identify FFA valuable for early diagnosis of NAFLD. METHODS: Serum FFA profiles of healthy and NAFLD (lean, overweight and obese) subjects was determined using gas chromatography-mass spectrometry (GC-MS) and distinctions in FFA patterns were evaluated using one-way ANOVA while Receiver operating characteristics (ROC) and logistic regression models were used to explore FFA significant for diagnosing NAFLD...
September 4, 2017: Lipids in Health and Disease
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