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Leptin, obesity

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https://www.readbyqxmd.com/read/28645653/catalase-overexpression-modulates-metabolic-parameters-in-a-new-stress-less-leptin-deficient-mouse-model
#1
Deborah L Amos, Tanner Robinson, Melissa B Massie, Carla Cook, Alexis Hoffsted, Courtney Crain, Nalini Santanam
Oxidative stress plays a key role in obesity by modifying the function of important biological molecules, thus altering obesogenic pathways such as glucose and lipid signaling. Catalase, is an important endogenous antioxidant enzyme that catabolizes hydrogen peroxide produced by the dismutation of superoxide. Recent studies have shown knockdown of catalase exacerbates insulin resistance and leads to obesity. We hypothesized that overexpressing catalase in an obese mouse will modulate obesogenic pathways and protect against obesity...
June 20, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28645331/circadian-clock-gene-polymorphisms-in-relation-to-sleep-patterns-and-obesity-in-african-americans-findings-from-the-jackson-heart-study
#2
Pia Riestra, Samson Y Gebreab, Ruihua Xu, Rumana J Khan, Amadou Gaye, Adolfo Correa, Nancy Min, Mario Sims, Sharon K Davis
BACKGROUND: Circadian rhythms regulate key biological processes and the dysregulation of the intrinsic clock mechanism affects sleep patterns and obesity onset. The CLOCK (circadian locomotor output cycles protein kaput) gene encodes a core transcription factor of the molecular circadian clock influencing diverse metabolic pathways, including glucose and lipid homeostasis. The primary objective of this study was to evaluate the associations between CLOCK single nucleotide polymorphisms (SNPs) and body mass index (BMI)...
June 23, 2017: BMC Genetics
https://www.readbyqxmd.com/read/28645299/programming-of-mouse-obesity-by-maternal-exposure-to-concentrated-ambient-fine-particles
#3
Minjie Chen, Xiaoke Wang, Ziying Hu, Huifen Zhou, Yanyi Xu, Lianglin Qiu, Xiaobo Qin, Yuhao Zhang, Zhekang Ying
BACKGROUND: Many diseases including obesity may originate through alterations in the early-life environment that interrupts fetal development. Increasing evidence has shown that exposure to ambient fine particles (PM2.5) is associated with abnormal fetal development. However, its long-term metabolic effects on offspring have not been systematically investigated. RESULTS: To determine if maternal exposure to PM2.5 programs offspring obesity, female C57Bl/6j mice were exposed to filtered air (FA) or concentrated ambient PM2...
June 23, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/28640857/glucose-dysregulation-and-response-to-common-anti-diabetic-agents-in-the-fatzo-pco-mouse
#4
Richard G Peterson, Charles Van Jackson, Karen M Zimmerman, Jorge Alsina-Fernandez, M Dodson Michael, Paul J Emmerson, Tamer Coskun
The FATZO/Pco mouse is the result of a cross of the C57BL/6J and AKR/J strains. The crossing of these two strains and the selective inbreeding for obesity, insulin resistance and hyperglycemia has resulted in an inbred strain exhibiting obesity in the presumed presence of an intact leptin pathway. Routinely used rodent models for obesity and diabetes research have a monogenic defect in leptin signaling that initiates obesity. Given that obesity and its sequelae in humans are polygenic in nature and not associated with leptin signaling defects, the FATZO mouse may represent a more translatable rodent model for study of obesity and its associated metabolic disturbances...
2017: PloS One
https://www.readbyqxmd.com/read/28640843/metabolic-milieu-associates-with-impaired-skeletal-characteristics-in-obesity
#5
Heli T Viljakainen, Heikki A Koistinen, Taina Tervahartiala, Timo Sorsa, Sture Andersson, Outi Mäkitie
High leptin concentration, low-grade inflammation, and insulin resistance often coexist in obese subjects; this adverse metabolic milieu may be the main culprit for increased fracture risk and impaired bone quality seen in patients with type 2 diabetes. We examined the associations of leptin, hs (high sensitivity)- CRP and insulin resistance with bone turnover markers (BTMs) and bone characteristics in 55 young obese adults (median BMI 40 kg/m2) and 65 non-obese controls. Mean age of the subjects was 19.5 ± 2...
2017: PloS One
https://www.readbyqxmd.com/read/28639107/depressive-symptoms-in-patients-with-obstructive-sleep-apnea-biological-mechanistic-pathways
#6
Diana A Chirinos, Indira Gurubhagavatula, Preston Broderick, Julio A Chirinos, Karen Teff, Thomas Wadden, Greg Maislin, Hassam Saif, Jesse Chittams, Caitlin Cassidy, Alexandra L Hanlon, Allan I Pack
This study examined the association between depressive symptoms, as well as depressive symptom dimensions, and three candidate biological pathways linking them to Obstructive sleep apnea (OSA): (1) inflammation; (2) circulating leptin; and (3) intermittent hypoxemia. Participants included 181 obese adults with moderate-to-severe OSA enrolled in the Cardiovascular Consequences of Sleep Apnea (COSA) trial. Depressive symptoms were measured using the Beck Depression Inventory-II (BDI-II). We assessed inflammation using C-reactive protein levels (CRP), circulating leptin by radioimmunoassay using a double antibody/PEG assay, and intermittent hypoxemia by the percentage of sleep time each patient had below 90% oxyhemoglobin saturation...
June 21, 2017: Journal of Behavioral Medicine
https://www.readbyqxmd.com/read/28638788/histone-deacetylases-microrna-and-leptin-crosstalk-in-pancreatic-cancer
#7
REVIEW
Cynthia I Tchio Mantho, Adriana Harbuzariu, Ruben R Gonzalez-Perez
Because pancreatic cancer (PC) historically has had poor prognosis and five year survival rates, it has been intensely investigated. Analysis of PC incidence and biology has shown a link between different risk factors such as smoking, alcoholism, and obesity and disease progression. Important factors affecting PC include the epigenomic changes driven by DNA methylation and histone acetylation, and actions of microRNA inducing oncogenic or tumor suppressor effects. Studies have identified markers whose dysregulation seem to play important roles in PC progression...
June 10, 2017: World Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28638270/existence-of-a-strong-correlation-of-biomarkers-and-mirna-in-females-with-metabolic-syndrome-and-obesity-in-a-population-of-west-virginia
#8
Perrine Goguet-Rubio, Rebecca L Klug, Dana L Sharma, Krithika Srikanthan, Nitin Puri, Vishal H Lakhani, Alexandra Nichols, Kathleen M O'Hanlon, Nader G Abraham, Joseph I Shapiro, Komal Sodhi
Objectives: Metabolic syndrome causes complications like cardiovascular disease and type 2 diabetes mellitus (T2DM). As metabolic syndrome develops, altered levels of cytokines and microRNAs (miRNA) are measurable in the circulation. We aimed to construct a panel detecting abnormal levels of cytokines and miRNAs in patients at risk for metabolic syndrome. Methods: Participants included 54 patients from a Family Medicine Clinic at Marshall University School of Medicine, in groups of: Control, Obese, and Metabolic Syndrome (MetS)...
2017: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/28638152/combination-of-a-high-fat-diet-with-sweetened-condensed-milk-exacerbates-inflammation-and-insulin-resistance-induced-by-each-separately-in-mice
#9
Laureane Nunes Masi, Amanda Roque Martins, Amanda Rabello Crisma, Cátia Lira do Amaral, Mariana Rodrigues Davanso, Tamires Duarte Afonso Serdan, Roberta Dourado Cavalcante da Cunha de Sá, Maysa Mariana Cruz, Maria Isabel Cardoso Alonso-Vale, Rosângela Pavan Torres, Jorge Mancini-Filho, Joice Naiara Bertaglia Pereira, Marta Maria da Silva Righetti, Edson Aparecido Liberti, Sandro Massao Hirabara, Rui Curi
Obesogenic diets increase body weight and cause insulin resistance (IR), however, the association of these changes with the main macronutrient in the diet remains to be elucidated. Male C57BL/6 mice were fed with: control (CD), CD and sweetened condensed milk (HS), high-fat (HF), and HF and condensed milk (HSHF). After 2 months, increased body weight, glucose intolerance, adipocyte size and cholesterol levels were observed. As compared with CD, HS ingested the same amount of calories whereas HF and HSHF ingested less...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28637727/a-protocol-for-prospective-studies-of-25-hydroxyvitamin-d-leptin-and-body-mass-index-in-relation-to-cutaneous-melanoma-incidence-and-survival
#10
Jo Steinson Stenehjem, Tom K Grimsrud, Judith R Rees, Linda Vos, Ronnie Babigumira, Marit B Veierød, Trude Eid Robsahm
INTRODUCTION: The incidence and mortality rates of cutaneous melanoma (CM) are increasing among fair-skinned populations worldwide. Ultraviolet radiation (UVR) is the principal risk factor for CM, but is also the main source of 25-hydroxyvitamin D (25(OH)D), which has been associated with reduced risk and better prognosis of some cancer types. However, both low and high 25(OH)D levels have been associated with increased risk of CM. Obesity as measured by body mass index (BMI) is associated with risk of several cancers and has also been suggested as a risk factor for CM, and may also be related to insufficient 25(OH)D and/or high leptin levels...
June 21, 2017: BMJ Open
https://www.readbyqxmd.com/read/28636414/non-dipping-status-and-selected-adipokines-concentration-in-children-with-primary-arterial-hypertension
#11
Agnieszka Jędzura, Piotr Adamczyk, Omar Bjanid, Elżbieta Świętochowska, Dagmara Roszkowska-Bjanid, Anna Baraniecka, Beata Banaszak, Krzysztof Plesiński, Aurelia Morawiec-Knysak, Katarzyna Ziora, Maria Szczepańska
High blood pressure (BP) in children and adolescents is associated with increased risk of persistent hypertension (HT) in adulthood and, consequently, cardiovascular disease and target organ damage. AIM: The values of selected anthropometric parameters and laboratory test results including leptin and apelin concentration were evaluated with regard to averaged values of office BP measurements and 24-hour ABPM. MATERIAL AND METHODS: The study included 55 children: 23-with primary HT and coexisting overweight or obese (HT-OB), 16-with primary HT and normal weight (HT-NW), and 16 healthy children (C)...
June 21, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28635909/-chronic-obstructive-pulmonary-disease-concurrent-with-metabolic-syndrome-pathophysiological-and-clinical-features
#12
A V Budnevsky, E S Ovsyannikov, N B Labzhania
Chronic obstructive pulmonary disease (COPD) still remains a serious public health problem, which is a common cause of disability and death in the able-bodied population. Furthermore, the number of patients with metabolic syndrome (MS) is steadily increasing worldwide. Recently, there is also an increase in the number of patients with COPD concurrent with MS, which is a mutually confounding risk factor for concomitant cardiovascular disease and adversely affects prognosis in these patients. Systemic subclinical inflammation is a common link between COPD and the components of MS...
2017: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/28630461/antrodia-cinnamomea-reduces-obesity-and-modulates-the-gut-microbiota-in-high-fat-diet-fed-mice
#13
C-J Chang, C-C Lu, C-S Lin, J Martel, Y-F Ko, D M Ojcius, T-R Wu, Y-H Tsai, T-S Yeh, J-J Lu, H-C Lai, J D Young
BACKGROUND: Obesity is associated with gut microbiota dysbiosis, disrupted intestinal barrier and chronic inflammation. Given the high and increasing prevalence of obesity worldwide, anti-obesity treatments that are safe, effective and widely available would be beneficial. We examined whether the medicinal mushroom Antrodia cinnamomea may reduce obesity in mice fed with a high-fat diet (HFD). METHODS: Male C57BL/6J mice were fed a HFD for eight weeks to induce obesity and chronic inflammation...
June 20, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28630279/obesity-and-p16-ink4a-down-regulation-activate-breast-adipocytes-and-promote-their-pro-tumorigenicity
#14
Huda H Al-Khalaf, Mrad Amir, Falah Al-Mohanna, Asma Tulbah, Adher Al-Sayed, Abdelilah Aboussekhra
Obesity is increasingly recognized as a risk factor for breast cancer development. However, the molecular basis of obesity-related breast carcinogenesis remains elusive. In this study, we have shown that obesity reduces the level of the tumor suppressor p16(INK4A) protein in breast adipocytes, which showed active features and strong pro-carcinogenic potential both in vitro and in orthotopic tumor xenografts, as compared to mature adipocytes from lean women. Furthermore, obesity triggered epithelial-to-mesenchymal transition (EMT) in breast ductal epithelial cells...
June 19, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28629451/metabolic-response-to-three-different-diets-in-lean-cats-and-cats-predisposed-to-overweight
#15
Claudia Keller, Annette Liesegang, Diana Frey, Brigitta Wichert
BACKGROUND: The existence of a genetic predisposition to obesity is commonly recognized in humans and rodents. Recently, a link between genetics and overweight was shown in cats. The goal of this study was to identify the effect of diet composition on plasma levels of glucose, insulin, free fatty acids and triglycerides in cats receiving different diets (high-carbohydrate, high-fat and high-protein diets). RESULTS: Insulin and leptin concentrations were significantly correlated with phenotype...
June 19, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28628401/dietary-red-and-processed-meat-intake-and-markers-of-adiposity-and-inflammation-the-multiethnic-cohort-study
#16
Weiwen Chai, Yukiko Morimoto, Robert V Cooney, Adrian A Franke, Yurii B Shvetsov, Loïc Le Marchand, Christopher A Haiman, Laurence N Kolonel, Marc T Goodman, Gertraud Maskarinec
OBJECTIVE: The potential influence of dietary factors on inflammation is important for cancer prevention. Utilizing data from control participants (312 men, 911 women) in 2 nested case-control studies of cancer within the Multiethnic Cohort, we examined the associations of red and processed meat intake with serum levels of leptin, adiponectin, C-reactive protein (CRP), tumor necrosis factor (TNF)-α, and interleukin (IL)-6 and the mediator effect of body mass index (BMI) on the above associations (if present)...
June 19, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28628399/polymorphisms-in-lep-and-lepr-genes-in-infants-correlation-with-serum-leptin-values-in-the-first-6-months-of-life
#17
Francesco Savino, Allegra Sardo, Paola Montanari, Ilaria Galliano, Liliana Di Stasio, Massimiliano Bergallo, Leandra Silvestro
OBJECTIVE: Because several studies indicate that polymorphisms in leptin (Lep) and leptin receptor (Lepr) genes play a central role in determining obesity, we analyzed 2 single nucleotide polymorphisms (SNPs) in the Lep gene (Lep G2548A and A19G) and one in the Lepr gene (Lepr A668G) to verify the effect of the 3 SNPs on leptin concentrations in infancy. METHODS: We enrolled 80 healthy Caucasian infants under 6 months of age, who were genotyped for the 3 SNPs with amplification refractory mutation system-mismatch amplification mutation assay (ARMS-MAMA) real-time polymerase chain reaction (PCR)...
June 19, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28627656/adipokines-and-free-fatty-acids-regulate-insulin-sensitivity-by-increasing-microrna-21-expression-in-human-mature-adipocytes
#18
Nannan Zhang, Naijian Zhang, Leilei Song, Hui Xie, Chao Zhao, Sujuan Li, Wenxi Zhao, Yaping Zhao, Chunlin Gao, Guangfeng Xu
Obesity is a global public health concern and may lead to a variety of complications. Previous studies have indicated that adipokines and energy‑source materials contribute to obesity and obesity‑associated insulin resistance. MicroRNAs (miRs) are endogenous 20‑ to 25‑nucleotide non‑coding RNAs associated with fat metabolism. It has been indicated that miR‑21 is associated with adipogenesis and metabolic syndrome. In the present study, the expression of miR‑21 in human mature adipocytes was analyzed using reverse transcription quantitative‑polymerase chain reaction following treatment with adipokines, including tumor necrosis factor (TNF)‑α, interleukin (IL)‑6, leptin, resistin and energy source materials, including free fatty acids (FFAs) and glucose...
June 14, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28625709/review-and-analysis-of-physical-exercise-at-hormonal-and-brain-level-and-its-influence-on-appetite
#19
Laura Gómez Escribano, Arancha Gálvez Casas, Antonio R Escribá Fernández-Marcote, Pedro Tárraga López, Loreto Tárraga Marcos
Due to the currently growing rate of obesity, it is important to maintain good control of food intake. The main purpose of the present study is to determine the influence of physical exercise on appetite, changes in hormone concentrations, and changes in certain neuronal regions. To achieve this, a literature search was conducted using different data bases. The results show how exercise produces changes in the appetite perception, in the amount of energy intake, and in different weight-control related hormones, as well as in specific neuronal responses...
June 15, 2017: Clínica e Investigación en Arteriosclerosis
https://www.readbyqxmd.com/read/28625550/maternal-exposure-to-western-diet-affects-adult-body-composition-and-voluntary-wheel-running-in-a-genotype-specific-manner-in-mice
#20
Layla Hiramatsu, Jarren Kay, Zoe Thompson, Jennifer Singleton, Gerald Claghorn, Ralph Lacerda de Albuquerque, Brittany Ho, Brett Ho, Gabriela Sanchez, Theodore Garland
Some human diseases, including obesity, Type II diabetes, and numerous cancers, are thought to be influenced by environments experienced in early life, including in utero. Maternal diet during the perinatal period may be especially important for adult offspring energy balance, potentially affecting both body composition and physical activity. This effect may be mediated by the genetic background of individuals, including, for example, potential "protective" mechanisms for individuals with inherently high levels of physical activity or high basal metabolic rates...
June 15, 2017: Physiology & Behavior
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