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Body homeostasis

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https://www.readbyqxmd.com/read/28722029/effects-of-procedure-upright-equilibrium-time-sex-and-bmi-on-the-precision-of-body-fluid-measurements-using-bioelectrical-impedance-analysis
#1
S Thurlow, G Taylor-Covill, P Sahota, B Oldroyd, K Hind
BACKGROUND/OBJECTIVES: Extensive work has addressed the validity of bioimpedance (BIA) measurements and the effect of posture on fluid homeostasis. However, limited research has investigated effects of subject preparation. This study aimed to determine the precision of total body water (TBW) and extracellular water (ECW) measurements using a stand-on multifrequency BIA (MFBIA seca mBCA 514/515), in three pre-test procedures: supine, sitting, and following walking, with specific reference to the influence of sex and body mass index (BMI)...
July 19, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28721138/the-effect-of-orlistat-versus-metformin-on-body-composition-and-insulin-resistance-in-obese-premenopausal-women-3-month-randomized-prospective-open-label-study
#2
Magdalena Kujawska-Łuczak, Katarzyna Musialik, Monika Szulińska, Ewelina Swora-Cwynar, Angelina Kargulewicz, Małgorzata Grzymisławska, Danuta Pupek-Musialik, Paweł Bogdański
INTRODUCTION: Our aim was to evaluate the effects of metformin and orlistat on body composition and glucose-insulin homeostasis in obese premenopausal women. MATERIAL AND METHODS: Seventy-three obese premenopausal Caucasian women aged 32.4 ±8.3 years were treated with either metformin (1000 mg/day; n = 37) or orlistat (360 mg/day; n = 36). Anthropometric parameters were measured using dual-energy X-ray absorptiometry. Glucose tolerance, using the oral glucose tolerance test; insulin resistance, using the homeostasis model assessment (HOMA-IR); and insulin sensitivity, using the Matsuda insulin sensitivity index (ISI Matsuda), were assessed at the commencement of the study and after 3 months...
June 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28720899/p32-heterozygosity-protects-against-age-and-diet-induced-obesity-by-increasing-energy-expenditure
#3
Yong Liu, Patrick L Leslie, Aiwen Jin, Koji Itahana, Lee M Graves, Yanping Zhang
Obesity is increasing in prevalence and has become a global public health problem. The main cause of obesity is a perturbation in energy homeostasis, whereby energy intake exceeds energy expenditure. Although mitochondrial dysfunction has been linked to the deregulation of energy homeostasis, the precise mechanism is poorly understood. Here, we identify mitochondrial p32 (also known as C1QBP) as an important regulator of lipid homeostasis that regulates both aerobic and anaerobic energy metabolism. We show that while whole-body deletion of the p32 results in an embryonic lethal phenotype, mice heterozygous for p32 are resistant to age- and high-fat diet-induced ailments, including obesity, hyperglycemia, and hepatosteatosis...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717161/development-and-characterization-of-a-novel-prox1-egfp-lymphatic-and-schlemm-s-canal-reporter-rat
#4
Eunson Jung, Daniel Gardner, Dongwon Choi, Eunkyung Park, Young Jin Seong, Sara Yang, Jorge Castorena-Gonzalez, Antoine Louveau, Zhao Zhou, Gene K Lee, David P Perrault, Sunju Lee, Maxwell Johnson, George Daghlian, Maria Lee, Yeo Jin Hong, Yukinari Kato, Jonathan Kipnis, Michael J Davis, Alex K Wong, Young-Kwon Hong
The lymphatic system plays a key role in tissue fluid homeostasis, immune cell trafficking, and fat absorption. We previously reported a bacterial artificial chromosome (BAC)-based lymphatic reporter mouse, where EGFP is expressed under the regulation of the Prox1 promoter. This reporter line has been widely used to conveniently visualize lymphatic vessels and other Prox1-expressing tissues such as Schlemm's canal. However, mice have a number of experimental limitations due to small body size. By comparison, laboratory rats are larger in size and more closely model the metabolic, physiological, and surgical aspects of humans...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28716975/metabolic-phenotype-in-the-mouse-model-of-osteogenesis-imperfecta
#5
Iris Boraschi-Diaz, Josephine T Tauer, Omar El Rifai, Delphine Guillemette, Geneviève Lefebvre, Frank Rauch, Mathieu Ferron, Svetlana V Komarova
Osteogenesis Imperfecta (OI) is the most common heritable bone fragility disorder, usually caused by dominant mutations in genes coding for collagen type I alpha chains, COL1A1 or COL1A2. Osteocalcin is now recognized as a bone-derived regulator of insulin secretion and sensitivity and glucose homeostasis. Since OI is associated with increased rates of bone formation and resorption, we hypothesized that the levels of undercarboxylated osteocalcin are increased in OI. The objective of this study was to determine changes in osteocalcin and to elucidate the metabolic phenotype in the Col1a1Jrt/+ mouse, a model of dominant OI caused by a Col1a1 mutation...
July 17, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28716822/dock2-deficiency-mitigates-high-fat-diet-induced-obesity-by-reducing-adipose-tissue-inflammation-and-increasing-energy-expenditure
#6
Xia Guo, Feifei Li, Zaiyan Xu, Amelia Yin, Hang Yin, Chenxiao Li, Shi-You Chen
Obesity is the major risk factor for type 2 diabetes, cardiovascular disorders, and many other diseases. Adipose tissue inflammation is frequently associated with obesity and contributes to the morbidity and mortality. Dedicator of cytokinesis 2 (DOCK2) is involved in several inflammatory diseases, but its role in obesity remain unknown. To explore the function of DOCK2 in obesity and insulin resistance, wild-type (WT) and DOCK2 deficient (DOCK2-/-) mice were given chow or high-fat diet (HFD) for 12 weeks followed by metabolic, biochemical and histologic analyses...
July 17, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28716720/met-signaling-mediates-intestinal-crypt-villus-development-regeneration-and-adenoma-formation-and-is-promoted-by-stem-cell-cd44-isoforms
#7
Sander P J Joosten, Jurrit Zeilstra, Harmen van Andel, R Clinton Mijnals, Joost Zaunbrecher, Annet A M Duivenvoorden, Marc van de Wetering, Hans Clevers, Marcel Spaargaren, Steven T Pals
BACKGROUND & AIMS: Resistance of metastatic human colorectal cancer cells to drugs that block epidermal growth factor receptor (EGFR) signaling could be caused by aberrant activity of other receptor tyrosine kinases, activating overlapping signaling pathways. One of these receptor tyrosine kinases could be MET, the receptor for hepatocyte growth factor (HGF). We investigated how MET signaling, and its interaction with CD44 (a putative MET co-receptor regulated by Wnt signaling and highly expressed by intestinal stem cells [ISCs] and adenomas) affects intestinal homeostasis, regeneration, and adenoma formation in mini-gut organoids and mice...
July 14, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28710952/indices-of-insulin-resistance-and-glucotoxicity-are-not-associated-with-bipolar-disorder-or-major-depressive-disorder-but-are-differently-associated-with-inflammatory-oxidative-and-nitrosative-biomarkers
#8
Kamila Landucci Bonifácio, Décio Sabbatini Barbosa, Estefânia Gastaldello Moreira, Carine Coneglian de Farias, Luciana Higachi, Alissana Ester Iakmiu Camargo, Janaina Favaro Soares, Heber Odebrecht Vargas, Sandra Odebrecht Vargas Nunes, Michael Berk, Seetal Dodd, Michael Maes
BACKGROUND: Insulin resistance (IR) is a key factor in diabetes mellitus, metabolic syndrome (MetS) and obesity and may occur in mood disorders and tobacco use disorder (TUD), where disturbances of immune-inflammatory, oxidative and nitrosative stress (IO&NS) pathways are important shared pathophysiological pathways. METHODS: This study aimed to a) examine IR and β-cell function as measured by the homeostasis model assessment of insulin resistance (HOMA-IR) and insulin sensitivity and β cell function (HOMA-B) and glucotoxicity (conceptualized as increased glucose levels versus lowered HOMA-B values) in 74 participants with major depressive disorder (MDD) and bipolar disorder, with and or without MetS and TUD, versus 46 healthy controls, and b) whether IR is associated with IO&NS biomarkers, including nitric oxide metabolites (NOx), lipid hydroperoxides (LOOH), plasma advanced oxidation protein products (AOPP), C-reactive protein (CRP), haptoglobin (Hp) and uric acid...
July 6, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28710353/potential-mediating-biomarkers-underlying-the-association-of-body-mass-index-or-waist-circumference-with-blood-pressure-results-from-three-population-based-studies
#9
Xiaoyan Wu, Xue Yang, Ruiqi Shan, Tianjiao Li, Tianqi Zi, Ying Li, Lixin Na, Changhao Sun
We conducted a comprehensive and in-depth assessment of body mass index (BMI) or waist circumference (WC) related to blood pressure (BP) and determined whether the association is mediated by the possible potential mediators in the cross-sectional survey of the Harbin Cohort Study on Diet, Nutrition and Chronic Non-communicable Diseases of 7094 participants aged 20-74 years, and validated the significant findings in the US National Health and Nutrition Examination Survey four cross-sectional cohorts (2005-2006, 2007-2008, 2009-2010, and 2011-2012) and the cohort data of the Harbin People's Health Study (a median of 4...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28710142/perspective-neuroregenerative-nutrition
#10
Dennis A Steindler, Brent A Reynolds
Good health while aging depends upon optimal cellular and organ functioning that contribute to the regenerative ability of the body during the lifespan, especially when injuries and diseases occur. Although diet may help in the maintenance of cellular fitness during periods of stability or modest decline in the regenerative function of an organ, this approach is inadequate in an aged system, in which the ability to maintain homeostasis is further challenged by aging and the ensuing suboptimal functioning of the regenerative unit, tissue-specific stem cells...
July 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28710138/disruption-of-lipid-uptake-in-astroglia-exacerbates-diet-induced-obesity
#11
Yuanqing Gao, Clarita Layritz, Beata Legutko, Thomas O Eichmann, Elise Laperrousaz, Valentine S Moullé, Celine Cruciani-Guglielmacci, Christophe Magnan, Serge Luquet, Stephen C Woods, Robert H Eckel, Chun-Xia Yi, Cristina Garcia-Caceres, Matthias H Tschöp
Neuronal circuits in the brain help to control feeding behavior and systemic metabolism in response to afferent nutrient and hormonal signals. Although astrocytes have historically been assumed to be less relevant for such neuroendocrine control, we asked whether lipid uptake via lipoprotein lipase (LPL) in astrocytes is required for the central regulation of energy homeostasis. Ex vivo studies with hypothalamic-derived astrocytes showed that LPL expression is up-regulated by oleic acid; whereas it is decreased in response to palmitic acid or triglyceride...
July 14, 2017: Diabetes
https://www.readbyqxmd.com/read/28709906/effects-of-feeding-time-on-daily-rhythms-of-neuropeptide-and-clock-gene-expression-in-the-rat-hypothalamus
#12
Dawei Wang, Anne-Loes Opperhuizen, Jane Reznick, Nigel Turner, Yan Su, Gregory J Cooney, Andries Kalsbeek
Shiftworkers are exposed to several adverse health conditions, one being eating at night. Food consumption at an unnatural time-of-day is thought to be one of the main factors responsible for the increased risk of developing metabolic diseases, such as obesity and diabetes mellitus. The underlying mechanism is considered to include disruption of the circadian organization of physiology, leading to disruption of metabolism. When food is consumed at night, the hypothalamus, a brain region central to homeostasis, receives contradicting input from the central clock and the systemic circulation...
July 11, 2017: Brain Research
https://www.readbyqxmd.com/read/28708512/insulin-during-in%C3%A2-vitro-oocyte-maturation-has-an-impact-on-development-mitochondria-and-cytoskeleton-in-bovine-day-8-blastocysts
#13
Denise Laskowski, Renée Båge, Patrice Humblot, Göran Andersson, Marc-André Sirard, Ylva Sjunnesson
Insulin is a key metabolic hormone that controls energy homeostasis in the body, including playing a specific role in regulating reproductive functions. Conditions associated with hyperinsulinemia can lower developmental rates in bovine in vitro embryo production and are linked to decreased fertility in humans, as in cases of obesity or type 2 diabetes. Embryo quality is important for fertility outcome and it can be assessed by choosing scoring standards for various characteristics, such as developmental stage, quality grade, cell number, mitochondrial pattern or actin cytoskeleton structure...
June 13, 2017: Theriogenology
https://www.readbyqxmd.com/read/28708100/airborne-pm2-5-induced-hepatic-insulin-resistance-by-nrf2-jnk-mediated-signaling-pathway
#14
Jinxia Xu, Wei Zhang, Zhongbing Lu, Fang Zhang, Wenjun Ding
Animal and epidemiological studies have suggested that exposure to airborne particulate matter (PM) with an aerodynamic diameter less than 2.5 μm (PM2.5) is associated with the risk of developing type 2 diabetes. However, the mechanism underlying this risk is poorly understood. In the present study, we investigated the effects of PM2.5 exposure on glucose homeostasis and related signaling pathways in mice. Wild-type and nuclear factor erythroid 2-related factor 2 (Nrf2) knockout (Nrf2(-)(/)(-)) C57BL/6 male mice were exposed to either ambient concentrated PM2...
July 14, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28706733/the-effect-of-characteristics-of-proteins-fed-during-gestation-and-lactation-on-development-of-metabolic-syndrome-in-dams-and-male-offspring-of-wistar-rats
#15
A Jahan-Mihan, C A Labyak, A Y Arikawa
OBJECTIVE: The objective of the study is to examine the role of characteristics of proteins in maternal and weaning diets on risk of metabolic syndrome in male offspring. METHODS: Pregnant Wistar rats were allocated to two groups (n = 12) and were fed the AIN-93G diets based on either intact protein-based diet (IPD) or mixed amino acid-based diet (AAD) from day 3 of gestation throughout gestation and lactation. Male offspring were weaned to either an IPD or AAD diet for 18 weeks...
June 2017: Obesity Science & Practice
https://www.readbyqxmd.com/read/28706520/hypothermia-promotes-interleukin-22-expression-and-fine-tunes-its-biological-activity
#16
Evgeny Chichelnitskiy, Britta Himmelseher, Malte Bachmann, Josef Pfeilschifter, Heiko Mühl
Disturbed homeostasis as a result of tissue stress can provoke leukocyte responses enabling recovery. Since mild hypothermia displays specific clinically relevant tissue-protective properties and interleukin (IL)-22 promotes healing at host/environment interfaces, effects of lowered ambient temperature on IL-22 were studied. We demonstrate that a 5-h exposure of endotoxemic mice to 4°C reduces body temperature by 5.0° and enhances splenic and colonic il22 gene expression. In contrast, tumor necrosis factor-α and IL-17A were not increased...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28706490/effects-of-6-weeks-high-intensity-interval-training-in-schoolchildren-with-insulin-resistance-influence-of-biological-maturation-on-metabolic-body-composition-cardiovascular-and-performance-non-responses
#17
Cristian Alvarez, Rodrigo Ramírez-Campillo, Robinson Ramírez-Vélez, Mikel Izquierdo
Background: Previous studies have observed significant heterogeneity in the magnitude of change in measures of metabolic response to exercise training. There are a lack of studies examining the prevalence of non-responders (NRs) in children while considering other potential environmental factors involved such as biological maturation. Aim: To compare the effects and prevalence of NRs to improve the insulin resistance level (by HOMA-IR), as well as to other anthropometric, cardiovascular, and performance co-variables, between early (EM) and normal maturation (NM) in insulin-resistance schoolchildren after 6-weeks of HIIT...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28706220/opportunities-for-therapeutic-antibodies-directed-at-g-protein-coupled-receptors
#18
REVIEW
Catherine J Hutchings, Markus Koglin, William C Olson, Fiona H Marshall
G-protein-coupled receptors (GPCRs) are activated by a diverse range of ligands, from large proteins and proteases to small peptides, metabolites, neurotransmitters and ions. They are expressed on all cells in the body and have key roles in physiology and homeostasis. As such, GPCRs are one of the most important target classes for therapeutic drug discovery. The development of drugs targeting GPCRs has therapeutic value across a wide range of diseases, including cancer, immune and inflammatory disorders as well as neurological and metabolic diseases...
July 14, 2017: Nature Reviews. Drug Discovery
https://www.readbyqxmd.com/read/28706218/patch-clamp-assisted-single-neuron-lipidomics
#19
Collin B Merrill, Abdul Basit, Andrea Armirotti, Yousheng Jia, Christine M Gall, Gary Lynch, Daniele Piomelli
Our understanding of the physiological and pathological functions of brain lipids is limited by the inability to analyze these molecules at cellular resolution. Here, we present a method that enables the detection of lipids in identified single neurons from live mammalian brains. Neuronal cell bodies are captured from perfused mouse brain slices by patch clamping, and lipids are analyzed using an optimized nanoflow liquid chromatography/mass spectrometry protocol. In a first application of the method, we identified more than 40 lipid species from dentate gyrus granule cells and CA1 pyramidal neurons of the hippocampus...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28705812/molecular-mechanisms-underlying-metabolic-syndrome-the-expanding-role-of-the-adipocyte
#20
REVIEW
Andrea Armani, Alessandra Berry, Francesca Cirulli, Massimiliano Caprio
The metabolic syndrome (MetS) is defined as a cluster of 3 or more metabolic and cardiovascular risk factors and represents a serious problem for public health. Altered function of adipose tissue has a significant impact on whole-body metabolism and represents a key driver for the development of these metabolic derangements, collectively referred as to MetS. In particular, increased visceral and ectopic fat deposition play a major role in the development of insulin resistance and MetS. A large body of evidence demonstrates that aging and MetS share several metabolic alterations...
July 13, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
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