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https://www.readbyqxmd.com/read/28735903/genetics-of-non-syndromic-childhood-obesity-and-the-use-of-high-throughput-dna-sequencing-technologies
#1
REVIEW
Ana Carolina Proença da Fonseca, Claudio Mastronardi, Angad Johar, Mauricio Arcos-Burgos, Gilberto Paz-Filho
BACKGROUND: Childhood obesity is a serious public health problem associated with the development of several chronic diseases, such as type 2 diabetes mellitus, dyslipidemia, and hypertension. The elevated prevalence of obesity is mostly due to inadequate diet and lifestyle, but it is also influenced by genetic factors. OBJECTIVES: To review recent advances in the field of the genetics of obesity. We summarize the list of genes associated with the rare non-syndromic forms of obesity, and explain their function...
June 16, 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/28729467/stat3-activation-by-leptin-receptor-is-essential-for-tnbc-stem-cell-maintenance
#2
Praveena S Thiagarajan, Qiao Zheng, Manvir Bhagrath, Erin E Mulkearns-Hubert, Martin G Myers, Justin D Lathia, Ofer Reizes
Leptin (LEP) binds to the long form of the leptin receptor (LEPRb), leading to the activation of multiple signaling pathways that are potential targets for disrupting the obesity-breast cancer link. In triple-negative breast cancer (TNBC), LEP is hypothesized to predominantly mediate its tumorigenic effects via a subpopulation of LEPRb-positive tumor cells termed cancer stem cells (CSCs) that can initiate tumors and induce tumor progression. Previously, we showed that LEP promotes CSC survival in vivo Moreover, silencing LEPRb in TNBC cells compromised the CSC state...
August 2017: Endocrine-related Cancer
https://www.readbyqxmd.com/read/28729389/severe-energy-deficit-up-regulates-leptin-receptors-leptin-signaling-and-ptp1b-in-human-skeletal-muscle
#3
Ismael Perez-Suarez, Jesus Gustavo Ponce-Gonzalez, Jaime de La Calle-Herrero, Jose Losa-Reyna, Marcos Martin-Rincon, David Morales-Alamo, Alfredo Santana, Hans-Christer Holmberg, Jose A L Calbet
In obesity, leptin receptors (OBR) and leptin signaling in skeletal muscle are down-regulated. To determine whether OBR and leptin signaling are up-regulated with a severe energy deficit fifteen overweight men were assessed before (PRE), after 4 days of caloric restriction (3.2 Kcal/kg BW/day) in combination with prolonged exercise (CRE) (8h walking + 45min single-arm cranking/day) to induce an energy deficit of ~5500 Kcal/d, and following 3 days of control diet (isoenergetic) and reduced exercise (CD). During CRE, the diet consisted solely of whey protein (n=8) or sucrose (n=7) (0...
July 20, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28727208/differential-expression-of-appetite-regulating-genes-in-avian-models-of-anorexia-and-obesity
#4
Jiaqing Yi, Jingwei Yuan, Elizabeth R Gilbert, Paul B Siegel, Mark A Cline
Chickens from lines that have been selected for low (LWS) or high (HWS) juvenile body weight for more than 57 generations provide a unique model to research appetite regulation. The LWS display different severities of anorexia while all HWS become obese. Herein we measured mRNA abundance of various factors in appetite-associated nuclei in the hypothalamus. The lateral hypothalamus (LHA), paraventricular nucleus (PVN), ventromedial hypothalamus (VMH), dorsomedial nucleus (DMN), and arcuate nucleus (ARC) were collected from 5 day-old chicks that were fasted for 180 minutes or provided continuous access to food...
July 20, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28727056/effects-of-protein-and-fat-concentration-in-coproduct-based-growing-calf-diets-on-adipogenic-and-lipogenic-gene-expression-blood-metabolites-and-carcass-composition
#5
J R Segers, J J Loor, S J Moisá, D Gonzalez, D W Shike
Crossbred calves ( = 30; age = 95 ± 1.7 d; BW = 179 ± 18 kg) were fed 1 of 5 growing diets: 1) corn-based control, 2) low-fat, low-protein coproduct blend, 3) high-fat, low-protein coproduct blend, 4) low-fat, high-protein coproduct blend, and 5) high-fat, high-protein coproduct blend for 112 d (growing phase) followed by a common corn-based finishing diet (additional 112 d; finishing phase). Calves were biopsied at 0, 112, and 224 d for transcriptional analysis via real-time quantitative PCR of 14 genes associated with adipogenesis and lipogenesis within the muscle...
June 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28727022/triennial-growth-and-development-symposium-genetics-and-breeding-for-intramuscular-fat-and-oleic-acid-content-in-pigs
#6
J Estany, R Ros-Freixedes, M Tor, R N Pena
The intramuscular fat (IMF) and oleic acid (OL) content have been favorably related to pork quality and human health. This influences the purchasing behavior of consumers and, therefore, also shifts the attention of breeding companies toward whether these traits are included into the breeding goal of the lines producing for high-valued markets. Because IMF and OL are unfavorably associated with lean content, a key economic trait, the real challenge for the industry is not simply to increase IMF and OL, but rather to come up with the right trade-off between them and lean content...
May 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28723633/lepr-gene-gln223arg-polymorphism-and-type-2-diabetes-mellitus-a-meta-analysis-of-3-367-subjects
#7
Yan-Yan Li, Hui Wang, Xin-Xing Yang, Jing-Jing Wu, Hong-Yu Geng, Hyun Jun Kim, Zhi-Jian Yang, Lian-Sheng Wang
BACKGROUND: The Leptin receptor (LEPR) Gln223Arg gene polymorphism has been associated with an increased susceptibility to Type 2 diabetes mellitus (T2DM). Results from various studies, however, are inconsistent. OBJECTIVE AND METHODS: To better elucidate the association of LEPR Gln223Arg gene polymorphism with T2DM in the Chinese population, a meta-analysis of 3,367 subjects from seven independent studies was performed. The pooled odds ratios (ORs) and corresponding 95% confidence intervals (95% CI) were evaluated by the fixed-effects model...
June 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/28720877/role-of-the-histone-deacetylase-inhibitor-valproic-acid-in-high-fat-diet-induced-hypertension-via-inhibition-of-hdac1-angiotensin-ii-axis
#8
J Choi, S Y Park, T K Kwon, S-I Sohn, K M Park, J I Kim
BACKGROUND: Obesity is known as an epidemic worldwide because of consumption of westernized high-fat diets and one of the major risk factors of hypertension. Histone deacetylases (HDACs) control gene expression by regulating histone/non-histone protein deacetylation. HDAC inhibitors exert anti-cancer and anti-inflammatory effects and play a protective role in cardiovascular diseases. In the present study, we tested the effect of an FDA-approved pan-HDAC inhibitor valproic acid (VPA) on high-fat diet (HFD)-induced hypertension in mice...
July 19, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28719892/cinnamaldehyde-ameliorates-diet-induced-obesity-in-mice-by-inducing-browning-of-white-adipose-tissue
#9
Jiacheng Zuo, Dandan Zhao, Na Yu, Xin Fang, Qianqian Mu, Yue Ma, Fangfang Mo, Rui Wu, Rufeng Ma, Lili Wang, Ruyuan Zhu, Haixia Liu, Dongwei Zhang, Sihua Gao
BACKGROUND/AIMS: Obesity has become a major health concern with few effective medications. Cinnamaldehyde (CA) has been reported to exhibit anti-diabetic and anti-inflammatory properties. However, whether CA shows anti-obesity activity remains unknown. Therefore, the present study aimed to investigate the potential anti-obesity effects of CA on mice fed a high-fat diet (HFD) and to explore the possible mechanisms involved. METHODS: Male C57BL/6J mice fed an HFD for 12 weeks were supplemented with CA (40 mg/kg/day) via gavage for an additional 8 weeks...
July 18, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28718206/delta-like-protein-1-in-the-pituitary-adipose-axis-in-the-adult-male-mouse
#10
Aixa R Bello, Ricardo A Puertas-Avendaño, María J González-Gómez, Miriam González-Gómez, Jorge Laborda, Carmen Damas, María Ruiz-Hidalgo, Carmen Diaz
With the aim of studying delta-like protein 1 (DLK1) implication in the relationship between adipocyte leptin and adenohypophyseal hormones, we carried out an immunohistochemical study to analyse the presence of receptors for these hormones in pituitary and adipose cells of male wildtype mice (Dlk1(+/+) ), compared to knockout mice (Dlk1(-/-) ). The mRNA expression of these molecules was also determined by RT-PCR. Our results showed that in wildtype adipose cells all the adenohypophyseal hormone receptors were present, with a higher mRNA expression for GHR and TSHR...
July 17, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28717967/orexin-a-hypocretin-modulates-leptin-receptor-mediated-signaling-by-allosteric-modulations-mediated-by-the-ghrelin-ghs-r1a-receptor-in-hypothalamic-neurons
#11
Mireia Medrano, David Aguinaga, Irene Reyes-Resina, Enric I Canela, Josefa Mallol, Gemma Navarro, Rafael Franco
The hypothalamus is a key integrator of nutrient-seeking signals in the form of hormones and metabolites originated in both the central nervous system and the periphery. The main autocrine and paracrine target of orexinergic-related hormones such as leptin, orexin/hypocretin, and ghrelin are neuropeptide Y neurons located in the arcuate nucleus of the hypothalamus. The aim of this study was to investigate the expression and the molecular and functional relationships between leptin, orexin/hypocretin and ghrelin receptors...
July 17, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28714970/bone-marrow-adipocytes-promote-the-regeneration-of-stem-cells-and-haematopoiesis-by-secreting-scf
#12
Bo O Zhou, Hua Yu, Rui Yue, Zhiyu Zhao, Jonathan J Rios, Olaia Naveiras, Sean J Morrison
Endothelial cells and leptin receptor(+) (LepR(+)) stromal cells are critical sources of haematopoietic stem cell (HSC) niche factors, including stem cell factor (SCF), in bone marrow. After irradiation or chemotherapy, these cells are depleted while adipocytes become abundant. We discovered that bone marrow adipocytes synthesize SCF. They arise from Adipoq-Cre/ER(+) progenitors, which represent ∼5% of LepR(+) cells, and proliferate after irradiation. Scf deletion using Adipoq-Cre/ER inhibited haematopoietic regeneration after irradiation or 5-fluorouracil treatment, depleting HSCs and reducing mouse survival...
July 17, 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28714862/a-leptin-regulated-circuit-controls-glucose-mobilization-during-noxious-stimuli
#13
Jonathan N Flak, Deanna Arble, Warren Pan, Christa Patterson, Thomas Lanigan, Paulette B Goforth, Jamie Sacksner, Maja Joosten, Donald A Morgan, Margaret B Allison, John Hayes, Eva Feldman, Randy J Seeley, David P Olson, Kamal Rahmouni, Martin G Myers
Adipocytes secrete the hormone leptin to signal the sufficiency of energy stores. Reductions in circulating leptin concentrations reflect a negative energy balance, which augments sympathetic nervous system (SNS) activation in response to metabolically demanding emergencies. This process ensures adequate glucose mobilization despite low energy stores. We report that leptin receptor-expressing neurons (LepRb neurons) in the periaqueductal gray (PAG), the largest population of LepRb neurons in the brain stem, mediate this process...
July 17, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28713076/prospective-relation-of-circulating-adipokines-to-incident-metabolic-syndrome-the-framingham-heart-study
#14
Justin P Zachariah, Rene Quiroz, Kerrie P Nelson, Zhaoyang Teng, John F Keaney, Lisa M Sullivan, Ramachandran S Vasan
BACKGROUND: Adipokines are elaborated by adipose tissue and are associated with glycemic, lipid, and vascular traits. We hypothesized that in a cross-sectional analysis circulating adipokines are altered among subsets of obesity stratified by presence versus absence of metabolic syndrome (MetS) and prospectively predict the incidence of MetS. METHODS AND RESULTS: Participants in the community-based Framingham Third Generation Cohort who attended examination cycle 1 were included in the study (2002-2005; N=3777, mean age, 40 years; 59% women)...
July 16, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28713075/association-of-parental-obesity-and-diabetes-mellitus-with-circulating-adipokines-in-nonobese-nondiabetic-offspring
#15
Justin P Zachariah, Rene Quiroz, Danielle Enserro, Charlotte Andersson, John F Keaney, Lisa M Sullivan, Ramachandran S Vasan
BACKGROUND: Adipokines are implicated in the development of obesity-related traits. We hypothesized that nonobese participants without diabetes mellitus (DM) whose parents were obese or had DM would have altered circulating adipokines compared with those without parental history of these conditions. METHODS AND RESULTS: Participants in the community-based Framingham Third Generation cohort who were not obese (body mass index <30) and not diabetic with both parents in the Framingham Offspring cohort were included in this analysis (n=2034, mean age 40 years, 54% women)...
July 16, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28711938/leptin-ob-r-pathway-promotes-il-4-secretion-from-b-lymphocytes-and-induces-salivary-gland-epithelial-cell-apoptosis-in-sj%C3%A3-gren-s-syndrome
#16
Ting Xu, Wen Xie, Yingchun Ma, Shiliang Zhou, Lu Zhang, Jinyun Chen, Mingyuan Cai, Rurong Sun, Peirong Zhang, Shaobo Yu, Zheng Xu, Wanlan Jiang, Min Wu
Sjögren's syndrome (SjS) is a chronic autoimmune epithelitis in which cell apoptosis promotes the formation of inflammatory lesions. We used immunohistochemistry and TUNEL to assay B cell infiltration and apoptosis in salivary gland tissue from 16-week-old NOD/LtJ mice with SjS. In co-cultures of primary salivary glandepithelial cells (SGECs) and spleen B cells, we assessed SGEC viability and apoptosis using CCK8 assays and flow cytometry. ELISAs were employed to assess cytokine levels in culture medium. Leptin protein, leptin receptor (OB-R), pro- and anti-apoptotic proteins, and Jak2/Stat3/ERK signaling molecules were analyzed using western blotting...
June 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28710369/the-adipokine-leptin-modulates-adventitial-pericyte-functions-by-autocrine-and-paracrine-signalling
#17
Federica Riu, Sadie C Slater, Eva Jover Garcia, Iker Rodriguez-Arabaolaza, Valeria Alvino, Elisa Avolio, Giuseppe Mangialardi, Andrea Cordaro, Simon Satchell, Carlo Zebele, Andrea Caporali, Gianni Angelini, Paolo Madeddu
Transplantation of adventitial pericytes (APCs) improves recovery from tissue ischemia in preclinical animal models by still unknown mechanisms. This study investigates the role of the adipokine leptin (LEP) in the regulation of human APC biological functions. Transcriptomic analysis of APCs showed components of the LEP signalling pathway are modulated by hypoxia. Kinetic studies indicate cultured APCs release high amounts of immunoreactive LEP following exposure to hypoxia, continuing upon return to normoxia...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28708429/effects-of-altered-photoperiod-on-circadian-clock-and-lipid-metabolism-in-rats
#18
Xiaoxian Xie, Binggong Zhao, Liangfeng Huang, Qichen Shen, Lingyan Ma, Yangyang Chen, Tao Wu, Zhengwei Fu
Disruption of circadian clock timekeeping due to changes in the photoperiod enhances the risk of lipid metabolism disorders and metabolic syndrome. However, the effects of altered photoperiods on the circadian clock and lipid metabolism are not well understood. To explore the effects of altered photoperiods, we developed a rat model where rats were exposed to either short-day or long-day conditions. Our findings demonstrated that altered photoperiods mediated circadian clocks by partly disrupting rhythmicity and shifting phase values of clock genes...
July 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28705795/selective-deletion-of-leptin-signaling-in-endothelial-cells-enhances-neointima-formation-and-phenocopies-the-vascular-effects-of-diet-induced-obesity-in-mice
#19
Astrid Hubert, Magdalena L Bochenek, Eva Schütz, Rajinikanth Gogiraju, Thomas Münzel, Katrin Schäfer
OBJECTIVE: Obesity is associated with elevated circulating leptin levels and hypothalamic leptin resistance. Leptin receptors (LepRs) are expressed on endothelial cells, and leptin promotes neointima formation in a receptor-dependent manner. Our aim was to examine the importance of endothelial LepR (End.LepR) signaling during vascular remodeling and to determine whether the cardiovascular consequences of obesity are because of hyperleptinemia or endothelial leptin resistance. APPROACH AND RESULTS: Mice with loxP-flanked LepR alleles were mated with mice expressing Cre recombinase controlled by the inducible endothelial receptor tyrosine kinase promoter...
July 13, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28705737/leptin-regulation-of-inward-membrane-currents-electrical-activity-and-lh-release-in-isolated-bovine-gonadotropes
#20
Belisario Domínguez-Mancera, Manuel Barrientos-Morales, Patricia Cervantes-Acosta, Antonio Hernández-Beltrán, Araceli Rodríguez-Andrade, Ricardo González-Ramírez, Eduardo Monjaraz, Ricardo Felix
Leptin, a peptide hormone produced by adipocytes, is recognized as one of the signals involved in the onset of reproductive activity. The leptin receptor has been found in hypothalamic neurons and pituitary gonadotropes, suggesting that the hormone may act at both sites to stimulate the secretion of GnRH and consequently, FSH and LH. In response to a stimulus such as a hypothalamic secretagogue, gonadotropes respond with changes in electrical activity, intracellular Ca(2+) and hormone release. The main aim of this report was to investigate whether leptin promotes a change in the electrical and secretory activities of bovine gonadotropes...
July 10, 2017: Biochemical and Biophysical Research Communications
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