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https://www.readbyqxmd.com/read/29667734/celastrol-reverses-palmitic-acid-pa-caused-tlr4-md2-activation-dependent-insulin-resistance-via-disrupting-md2-related-cellular-binding-to-pa
#1
Xue Zhang, Ying Wang, Hui-Ya Ge, Yi-Jun Gu, Fan-Fan Cao, Chun-Xin Yang, Georges Uzan, Bin Peng, Deng-Hai Zhang
Elevated plasma statured fatty acids (FFAs) cause TLR4/MD2 activation-dependent inflammation and insulin tolerance, which account for the occurrence and development of obesity. It has been confirmed that statured palmitic acid (PA) (the most abundant FFA) could bind MD2 to cause cellular inflammation. The natural compound celastrol could improve obesity, which is suggested via inhibiting inflammation, yet the detailed mechanism for celastrol is still unclear. As celastrol is reported to directly target MD2, we thought disrupting the binding between FFAs and MD2 might be one of the ways for celastrol to inhibit FFAs-caused inflammation and insulin resistance...
April 18, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29667480/the-human-gut-microbiota-metabolism-and-perspective-in-obesity
#2
Aline Corado Gomes, Christian Hoffmann, João Felipe Mota
The gut microbiota has been recognized as an important factor in the development of metabolic diseases such as obesity and is considered an endocrine organ involved in the maintenance of energy homeostasis and host immunity. Dysbiosis can change the functioning of the intestinal barrier and the gut-associated lymphoid tissues (GALT) by allowing the passage of structural components of bacteria, such as lipopolysaccharides (LPS), which activate inflammatory pathways that may contribute to the development of insulin resistance...
April 18, 2018: Gut Microbes
https://www.readbyqxmd.com/read/29666152/phenylmethimazole-abrogates-diet-induced-inflammation-glucose-intolerance-and-nafld
#3
Ashley Patton, Tyler Church, Caroline Wilson, Jean Thuma, Douglas J Goetz, Darlene E Berryman, Edward O List, Frank L Schwartz, Kelly D McCall
Nonalcoholic fatty liver disease (NAFLD) is the hepatic manifestation of both metabolic and inflammatory diseases and has become the leading chronic liver disease worldwide. High fat (HF) diets promote an increased uptake and storage of free fatty acids (FFAs) and triglycerides (TGs) in hepatocytes, which initiates steatosis and induces lipotoxicity, inflammation, and insulin resistance. Activation and signaling of Toll-like receptor 4 (TLR4) by FFAs induces inflammation evident in NAFLD and insulin resistance...
April 17, 2018: Journal of Endocrinology
https://www.readbyqxmd.com/read/29665988/mild-suppression-of-hyperinsulinemia-to-treat-obesity-and-insulin-resistance
#4
REVIEW
Melissa M Page, James D Johnson
Insulin plays roles in lipid uptake, lipolysis, and lipogenesis, in addition to controlling blood glucose levels. Excessive circulating insulin is associated with adipose tissue expansion and obesity, yet a causal role for hyperinsulinemia in the development of mammalian obesity has proven controversial, with many researchers suggesting it as a consequence of insulin resistance. Recently, evidence that specifically reducing hyperinsulinemia can prevent and reverse obesity in animal models has been presented...
April 14, 2018: Trends in Endocrinology and Metabolism: TEM
https://www.readbyqxmd.com/read/29665620/personalized-cardio-metabolic-responses-to-an-anti-inflammatory-nutrition-intervention-in-obese-adolescents-a-randomized-controlled-crossover-trial
#5
Aoibheann M McMorrow, Ruth M Connaughton, Tiago R Magalhães, Fiona C McGillicuddy, Maria F Hughes, David Cheishvili, Melissa J Morine, Sean Ennis, Marie-Louise Healy, Edna F Roche, Richard E Tremblay, Moshe Szyf, Fiona E Lithander, Helen M Roche
SCOPE: Chronic inflammation and hypoadiponectinemia are characteristic of obesity-induced insulin resistance (IR). The effect of an anti-inflammatory nutrition supplement (AINS) on IR and adiponectin biology in overweight adolescents was investigated. The secondary objective was to examine the extent to which individuals' biomarker profiles, derived from baseline phenotypes, predicted response or not to the AINS. Additionally, the impact of DNA methylation on intervention efficacy was assessed...
April 17, 2018: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29665358/hyperinsulinemic-euglycemic-clamp-over-the-first-year-of-use-of-depot-medroxyprogesterone-acetate-as-a-contraceptive
#6
Vaneska Melhado-Kimura, Gisele Almeida Batista, Aglécio Luiz de Souza, Priscilla de Nazaré Silva Dos Santos, Sarah Monte Alegre, Elizabeth João Pavin, Luis Bahamondes, Arlete Fernandes
OBJECTIVE: The literature lacks data on the use of the gold-standard hyperinsulinemic-euglycemic clamp (HEC) technique for the evaluation of insulin resistance (IR) in depot-medroxyprogesterone acetate (DMPA) users. This study assessed carbohydrate metabolism in non-obese users of DMPA using the HEC technique. STUDY DESIGN: A prospective, non-randomized, comparative study conducted at the Family Planning Clinic/Metabolic Unit, University of Campinas, Brazil. Forty-eight women aged 18-39 years underwent HEC: 30 initiating use of DMPA and 18 initiating use of a copper intrauterine device (IUD)...
April 14, 2018: Contraception
https://www.readbyqxmd.com/read/29665058/testicular-germ-cell-apoptosis-and-sperm-defects-in-mice-upon-long-term-high-fat-diet-feeding
#7
Songita Ghosh, Sutapa Mukherjee
The growing prevalence of male infertility is a matter of serious concern. One of the putative causes being nutritional excess from continuous consumption of high fat diet (HFD) leading to insulin resistance albeit the specific relationship is not fully understood. Besides, there are many contradictions in the available literature on the subject. Therefore, we sought to characterize in detail the effects of HFD upon testicular function and sperm quality in mice with particular focus on isolated testicular germ cells and spermatozoa, respectively...
April 17, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29665034/metabolic-features-of-nonalcoholic-fatty-liver-nafl-in-obese-adolescents-findings-from-a-multi-ethnic-cohort
#8
Domenico Tricò, Sonia Caprio, Giuseppina Rosaria Umano, Bridget Pierpont, Jessica Nouws, Alfonso Galderisi, Grace Kim, Mariana M Mata, Nicola Santoro
AIMS: We conducted a prospective study in a large, multiethnic cohort of obese adolescents to characterize clinical and genetic features associated with pediatric Non-Alcoholic Fatty Liver (NAFL), the most common cause of chronic liver disease in youth. METHODS: A total of 503 obese adolescents were enrolled, including 191 (38.0%) Caucasians, 134 (26.6%) African Americans, and 178 (35.4%) Hispanics. Participants underwent abdominal magnetic resonance imaging (MRI) to quantify hepatic fat content, an oral glucose tolerance test to assess glucose tolerance and insulin sensitivity, and the genotyping of three SNPs associated with fatty liver (PNPLA3 rs738409, GCKR rs1260326, and TM6SF2 rs58542926)...
April 17, 2018: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29664737/insulin-regulates-astrocyte-gliotransmission-and-modulates-behavior
#9
Weikang Cai, Chang Xue, Masaji Sakaguchi, Masahiro Konishi, Alireza Shirazian, Heather A Ferris, Mengyao Li, Ruichao Yu, Andre Kleinridders, Emmanuel N Pothos, C Ronald Kahn
Complications of diabetes affect tissues throughout body, including central nervous system. Epidemiological studies show that diabetic patients have increased risk of depression, anxiety, age-related cognitive decline and Alzheimer's disease. Mice lacking insulin receptor in brain or on hypothalamic neurons display an array of metabolic abnormalities, however, the role of insulin action on astrocytes and neurobehaviors remains less well-studied. Here, we demonstrate that astrocytes are a direct insulin target in the brain and that knockout of IR on astrocytes causes increased anxiety and depressive-like behaviors in mice...
April 17, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29664677/silac-based-quantitative-proteomic-analysis-of-the-livers-of-spontaneous-obese-and-diabetic-rhesus-monkeys
#10
Junlong Wang, Shimeng Xu, Jing Gao, Linqiang Zhang, Zhiguo Zhang, Wenhui Yang, Yunhai Li, Shasha Liao, Hu Zhou, Pingsheng Liu, Bin Liang
Type 2 diabetes mellitus (T2DM) is a severely metabolic disorder that affects above 10% worldwide population. Obesity is a major cause of insulin resistance and contributes to the development of T2DM. Liver is an essential metabolic organ that plays crucial roles in the pathogenesis of obesity and diabetes. However, the underlying mechanisms of liver in the transition of obesity to diabetes are not fully understood. Nonhuman primate (NHP) rhesus monkey is an appropriate animal for research of human diseases...
April 17, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29663892/complement-components-c3-and-c4-and-the-metabolic-syndrome
#11
Melanie Copenhaver, Chack-Yung Yu, Robert P Hoffman
INTRODUCTION: Increased systemic inflammation is engaged likely plays a significant role in the development of adult cardiometabolic diseases such as insulin resistance, dyslipidemia, atherosclerosis, and hypertension. The complement system is part of the innate immune system and plays a key role in in regulation inflammation. Of particular importance is the activation of complement components C3 and C4. C3 is produced primarily by the liver but is also produced in adipocytes, macrophages and endothelial cells, all of which are present in adipose tissue...
April 17, 2018: Current Diabetes Reviews
https://www.readbyqxmd.com/read/29663637/reproductive-health-obesity-and-cardiometabolic-risk-factors-among-samoan-women
#12
H Maredia, N L Hawley, G Lambert-Messerlian, U Fidow, M S Reupena, T Naseri, S T McGarvey
OBJECTIVES: Obesity leads to deleterious effects on not only cardiovascular health but also on the reproductive health of women. We estimate the prevalence of menstrual irregularity and of polycystic ovarian syndrome (PCOS) in Samoan women, among whom obesity prevalence is extremely high. We explore the association of these reproductive health conditions with adiposity, cardiometabolic risk factors, and androgen levels. METHODS: A cross-sectional sample of Samoan women 25-39 years of age (n = 470) from a larger population-based genome-wide association study of adiposity and cardiometabolic disease was assessed for the prevalence of oligomenorrhea/amenorrhea (OM/AM) using a self-reported questionnaire...
April 16, 2018: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/29663549/ostreolysin-induces-browning-of-adipocytes-and-ameliorates-hepatic-steatosis
#13
Lili Nimri, Katerina Staikin, Irena Peri, Einav Yehuda-Shnaidman, Betty Schwartz
BACKGROUND AND AIM: Nonalcoholic fatty liver disease (NAFLD) is associated with all features of the metabolic syndrome. Deposition of excess triglycerides in liver cells, a hallmark of NAFLD, is associated with loss of insulin sensitivity. Ostreolysin (Oly) is a 15-kDa fungal protein known to interact with cholesterol-enriched raft-like membrane domains. We aim to test whether a recombinant version of Oly (rOly) can induce functional changes in vitro in adipocytes or in vivo in mice fed a high-fat diet (HFD)...
April 16, 2018: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29663401/variants-in-the-ppargc1a-gene-may-influence-the-effect-of-fat-intake-on-resting-metabolic-rate-in-obese-women
#14
Sajjad Moradi, Khadijeh Mirzaei, Zhila Maghbooli, Ahmed A Abdurahman, Seyed Ali Keshavarz
Recent studies have shown that dietary intake and genetic variants play a decisive role in the risk of obesity. Therefore, this study was designed to examine the interaction between dietary fat and PPARGC1A polymorphisms on the level of resting metabolic rate (RMR). We enrolled 288 Iranian overweight and obese women in this cross-sectional study. We sequenced the 648 b.p. DNA in Exon 8 of PPARGC1A gene. We analyzed the two single-nucleotide polymorphisms, namely rs11290186 and rs2970847, in this region. All participants were assessed for RMR, dietary intake, and body composition...
April 16, 2018: Lipids
https://www.readbyqxmd.com/read/29662761/inflammation-and-age-associated-skeletal-muscle-deterioration-sarcopaenia
#15
REVIEW
Jinyu Wang, Kwok-Sui Leung, Simon Kwoon-Ho Chow, Wing-Hoi Cheung
Ageing is accompanied by chronic inflammatory responses due to elevated circulatory inflammatory cytokine production. Several inflammatory cytokines have been shown to be responsible for a decrease in muscle mass. However, little is known about the possible relationship between inflammation and sarcopaenia. This review aims to summarise the existing evidence about inflammation and sarcopaenia. Sarcopaenia is defined as an age-related decrease of muscle mass and/or muscle strength; it is caused by multiple factors, such as skeletal muscle atrophy, neuromuscular junction degeneration, hormone imbalance, cytokine imbalance, protein synthesis and proteolysis...
July 2017: Journal of Orthopaedic Translation
https://www.readbyqxmd.com/read/29662264/chromosome-6q24-related-diabetes-mellitus
#16
Tohru Yorifuji, Shinji Higuchi, Yuki Hosokawa, Rie Kawakita
Chromosome 6q24-related diabetes mellitus is the most common cause of transient neonatal diabetes (TNDM), accounting for approximately two-thirds of all TNDM cases. Patients with 6q24-TNDM develop insulin-requiring diabetes soon after birth, followed by the gradual improvement and eventual remission of the disorder by 18 mo of age. The most important clinical feature of affected patients is a small-for-gestational age (SGA) birth weight, which reflects the lack of insulin in utero. It is believed that 6q24-TNDM is caused by the overexpression of the paternal allele of the imprinted locus in chromosome 6q24, which contains only two expressed genes, PLAGL1 and HYMAI...
2018: Clinical Pediatric Endocrinology: Case Reports and Clinical Investigations: Official Journal of the Japanese Society for Pediatric Endocrinology
https://www.readbyqxmd.com/read/29662128/the-extracellular-domain-of-staphylococcus-aureus-ltas-binds-insulin-and-induces-insulin-resistance-during-infection
#17
Yu Liu, Fang-Jie Liu, Zhang-Chun Guan, Fang-Ting Dong, Jian-Hua Cheng, Ya-Ping Gao, Di Li, Jun Yan, Cheng-Hua Liu, Dian-Peng Han, Chun-Mei Ma, Jian-Nan Feng, Bei-Fen Shen, Guang Yang
Insulin resistance is a risk factor for obesity and diabetes and predisposes individuals to Staphylococcus aureus colonization; however, the contribution of S. aureus to insulin resistance remains unclear. Here, we show that S. aureus infection causes impaired glucose tolerance via secretion of an insulin-binding protein extracellular domain of LtaS, eLtaS, which blocks insulin-mediated glucose uptake. Notably, eLtaS transgenic mice (eLtaS trans ) exhibited a metabolic syndrome similar to that observed in patients, including increased food and water consumption, impaired glucose tolerance and decreased hepatic glycogen synthesis...
April 16, 2018: Nature Microbiology
https://www.readbyqxmd.com/read/29662006/hyperinsulinemia-promotes-esophageal-cancer-development-in-a-surgically-induced-duodeno-esophageal-reflux-murine-model
#18
Diletta Arcidiacono, Arben Dedja, Cinzia Giacometti, Matteo Fassan, Daniele Nucci, Simona Francia, Federico Fabris, Alice Zaramella, Emily J Gallagher, Mauro Cassaro, Massimo Rugge, Derek LeRoith, Alfredo Alberti, Stefano Realdon
Hyperinsulinemia could have a role in the growing incidence of esophageal adenocarcinoma (EAC) and its pre-cancerous lesion, Barrett's Esophagus, a possible consequence of Gastro-Esophageal Reflux Disease. Obesity is known to mediate esophageal carcinogenesis through different mechanisms including insulin-resistance leading to hyperinsulinemia, which may mediate cancer progression via the insulin/insulin-like growth factor axis. We used the hyperinsulinemic non-obese FVB/N (Friend leukemia virus B strain) MKR (muscle (M)-IGF1R-lysine (K)-arginine (R) mouse model to evaluate the exclusive role of hyperinsulinemia in the pathogenesis of EAC related to duodeno-esophageal reflux...
April 14, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29661799/the-role-of-beta-cell-heterogeneity-in-islet-function-and-insulin-release
#19
Daniela Nasteska, David Hodson
It is becoming increasingly apparent that not all insulin-secreting beta cells are equal. Subtle differences exist at the transcriptomic and protein expression levels, with repercussions for beta cell survival/proliferation, calcium signalling and insulin release. Notably, beta cell heterogeneity displays plasticity during development, metabolic stress and type 2 diabetes mellitus (T2DM). Thus, heterogeneity or lack thereof may be an important contributor to beta cell failure during T2DM in both rodents and humans...
April 16, 2018: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/29661693/phosphorylation-of-beta-3-adrenergic-receptor-at-serine-247-by-erk-map-kinase-drives-lipolysis-in-obese-adipocytes
#20
Shangyu Hong, Wei Song, Peter-James H Zushin, Bingyang Liu, Mark P Jedrychowski, Amir I Mina, Zhaoming Deng, Dimitrije Cabarkapa, Jessica A Hall, Colin J Palmer, Hassan Aliakbarian, John Szpyt, Steven P Gygi, Ali Tavakkoli, Lydia Lynch, Norbert Perrimon, Alexander S Banks
OBJECTIVE: The inappropriate release of free fatty acids from obese adipose tissue stores has detrimental effects on metabolism, but key molecular mechanisms controlling FFA release from adipocytes remain undefined. Although obesity promotes systemic inflammation, we find activation of the inflammation-associated Mitogen Activated Protein kinase ERK occurs specifically in adipose tissues of obese mice, and provide evidence that adipocyte ERK activation may explain exaggerated adipose tissue lipolysis observed in obesity...
March 29, 2018: Molecular Metabolism
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