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https://www.readbyqxmd.com/read/28545126/pheromone-sensing-neurons-regulate-peripheral-lipid-metabolism-in-caenorhabditis-elegans
#1
Rosalind Hussey, Jon Stieglitz, Jaleh Mesgarzadeh, Tiffany T Locke, Ying K Zhang, Frank C Schroeder, Supriya Srinivasan
It is now established that the central nervous system plays an important role in regulating whole body metabolism and energy balance. However, the extent to which sensory systems relay environmental information to modulate metabolic events in peripheral tissues has remained poorly understood. In addition, it has been challenging to map the molecular mechanisms underlying discrete sensory modalities with respect to their role in lipid metabolism. In previous work our lab has identified instructive roles for serotonin signaling as a surrogate for food availability, as well as oxygen sensing, in the control of whole body metabolism...
May 18, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28544360/impairment-of-insulin-signalling-in-peripheral-tissue-fails-to-extend-murine-lifespan
#2
Troy L Merry, Doreen Kuhlow, Beate Laube, Doris Pöhlmann, Andreas F H Pfeiffer, C Ronald Kahn, Michael Ristow, Kim Zarse
Impaired insulin/IGF1 signalling has been shown to extend lifespan in model organisms ranging from yeast to mammals. Here we sought to determine the effect of targeted disruption of the insulin receptor (IR) in non-neuronal tissues of adult mice on the lifespan. We induced hemizygous (PerIRKO(+/-) ) or homozygous (PerIRKO(-/-) ) disruption of the IR in peripheral tissue of 15-weeks-old mice using a tamoxifen-inducible Cre transgenic mouse with only peripheral tissue expression, and subsequently monitored glucose metabolism, insulin signalling and spontaneous death rates over 4 years...
May 22, 2017: Aging Cell
https://www.readbyqxmd.com/read/28544198/jaboticaba-berry-peel-intake-prevents-insulin-resistance-induced-tau-phosphorylation-in-mice
#3
Ângela G Batista, Edilene S Soares, Monique C P Mendonça, Juliana K da Silva, Ana Paula Dionísio, Cesar R Sartori, Maria Alice da Cruz-Höfling, Mário R Maróstica Júnior
The hyperphosphorylation of tau in the hippocampus can be caused by central and peripheral insulin resistance and these alterations are related to the development of tauopathies, such as Alzheimer's disease. In this study, we used a high-fat diet to induce obesity and insulin resistance in adult Swiss mice and checked whether supplementation with Myrciaria jaboticaba berry peel for 10 weeks could improve insulin sensitivity, learning/memory performance and prevent tau phosphorylation in the hippocampus. Furthermore, adipocytokines, inflammatory markers, and oxidative stress were assessed...
May 19, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28533244/a-population-pharmacokinetic-model-of-gentamicin-in-paediatric-oncology-patients-to-facilitate-personalised-dosing
#4
C C Llanos-Paez, C E Staatz, R Lawson, S Hennig
To ensure safe and effective dosing of gentamicin in children therapeutic drug monitoring (TDM) is recommended. TDM utilising Bayesian forecasting software is recommended, but is unavailable as no population model exists that describes the pharmacokinetics of gentamicin in paediatric oncology patients. This study aimed to develop and externally evaluate a population pharmacokinetic model of gentamicin to support personalised dosing in paediatric oncology patients. A non-linear mixed effect population pharmacokinetic model was developed from retrospective data...
May 22, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28525360/role-of-sigma-1-receptor-in-high-fat-diet-induced-peripheral-neuropathy
#5
Tieying Song, Jianhui Zhao, Xiaojing Ma, Zaiwang Zhang, Bo Jiang, Yunliang Yang
The neurobiological mechanisms of obesity-induced peripheral neuropathy are poorly understood. We evaluated the role of Sigma-1 receptor (Sig-1R) and NMDA receptor (NMDARs) in the spinal cord in peripheral neuropathy using an animal model of high fat diet-induced diabetes. We examined the expression of Sig-1R and NMDAR subunits GluN2A and GluN2B along with postsynaptic density protein 95 (PSD-95) in the spinal cord after 24- week HFD treatment in both wild-type and Sig-1R-/- mice. Finally, we examined the effects of repeated intrathecal administrations of selective Sig-1R antagonists BD1047 in HFD-fed wild-type mice on peripheral neuropathy...
May 19, 2017: Biological Chemistry
https://www.readbyqxmd.com/read/28521867/effect-of-a-single-bout-of-aerobic-exercise-on-high-fat-meal-induced-inflammation
#6
Kelly N Z Fuller, Corey M Summers, Rudy J Valentine
BACKGROUND AND AIMS: Chronic low-grade inflammation is involved in the development of metabolic disorders including atherosclerosis, type 2 diabetes (T2D) and metabolic syndrome. Aerobic exercise has been shown to be anti-inflammatory and attenuate postprandial blood lipids, however, the effect of exercise on postprandial inflammation remains unclear. The aim of this study was to determine the protective effect of a single bout of aerobic exercise against postprandial lipemia and peripheral blood mononuclear cell (PBMC) inflammation and to evaluate associations with changes in the energy-sensing enzyme, AMP-activated protein kinase (AMPK)...
June 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28520765/an-integrative-analysis-of-tissue-specific-transcriptomic-and-metabolomic-responses-to-short-term-dietary-methionine-restriction-in-mice
#7
Sujoy Ghosh, Laura A Forney, Desiree Wanders, Kirsten P Stone, Thomas W Gettys
Dietary methionine restriction (MR) produces a coordinated series of transcriptional responses in peripheral tissues that limit fat accretion, remodel lipid metabolism in liver and adipose tissue, and improve overall insulin sensitivity. Hepatic sensing of reduced methionine leads to induction and release of fibroblast growth factor 21 (FGF21), which acts centrally to increase sympathetic tone and activate thermogenesis in adipose tissue. FGF21 also has direct effects in adipose to enhance glucose uptake and oxidation...
2017: PloS One
https://www.readbyqxmd.com/read/28503116/melatonin-pharmacology-functions-and-therapeutic-benefits
#8
REVIEW
Sylvie Tordjman, Sylvie Chokron, Richard Delorme, Annaëlle Charrier, Eric Bellissant, Nemat Jaafari, Claire Fougerou
BACKGROUND: Melatonin synchronizes central but also peripheral oscillators (fetal adrenal gland, pancreas, liver, kidney, heart, lung, fat, gut, etc.), allowing temporal organization of biological functions through circadian rhythms (24-hour cycles) in relation to periodic environmental changes and therefore adaptation of the individual to his/her internal and external environment. Measures of melatonin are considered the best peripheral indices of human circadian timing based on an internal 24-hour clock...
April 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28500684/impact-of-roux-en-y-gastric-bypass-surgery-on-appetite-alcohol-intake-behaviors-and-midbrain-ghrelin-signaling-in-the-rat
#9
Sunil Sirohi, Ben D Richardson, Janelle M Lugo, David J Rossi, Jon F Davis
OBJECTIVE: Roux-en-Y gastric bypass (RYGB) surgery reduces appetite and stimulates new onset alcohol misuse; however, the genesis of these behavioral changes is unclear. This study is hypothesized that new onset alcohol intake is a behavioral adaptation that occurs secondary to reduced appetite and correlates with altered central ghrelin signaling. METHODS: Hedonic high-fat diet (HFD) intake was evaluated prior to the assessment of alcohol intake behaviors in RYGB and control rats...
May 12, 2017: Obesity
https://www.readbyqxmd.com/read/28492810/rimonabant-improves-metabolic-parameters-partially-attributed-to-restoration-of-high-voltage-activated-ca2-channels-in-skeletal-muscle-in-hfd-fed-mice
#10
B Chen, N Hu
Cannabinoid type 1 receptor (CB1R) inhibition tends to be one of the promising strategies for the treatment of obesity and other related metabolic disorders. Although CB1R inhibition may cause adverse psychiatric effects including depression and anxiety, the investigation of the role of peripheral CB1R on weight loss and related metabolic parameters are urgently needed. We first explored the effect of rimonabant, a selective CB1R antagonist/inverse agonist, on some metabolic parameters in high fat-diet (HFD)-induced obesity in mice...
May 4, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28490511/impact-of-breakfast-skipping-compared-with-dinner-skipping-on-regulation-of-energy-balance-and-metabolic-risk
#11
Alessa Nas, Nora Mirza, Franziska Hägele, Julia Kahlhöfer, Judith Keller, Russell Rising, Thomas A Kufer, Anja Bosy-Westphal
Background: Meal skipping has become an increasing trend of the modern lifestyle that may lead to obesity and type 2 diabetes.Objective: We investigated whether the timing of meal skipping impacts these risks by affecting circadian regulation of energy balance, glucose metabolism, and postprandial inflammatory responses.Design: In a randomized controlled crossover trial, 17 participants [body mass index (in kg/m(2)): 23.7 ± 4.6] underwent 3 isocaloric 24-h interventions (55%, 30%, and 15% carbohydrate, fat, and protein, respectively): a breakfast skipping day (BSD) and a dinner skipping day (DSD) separated by a conventional 3-meal-structure day (control)...
May 10, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28487798/orbital-t-cell-lymphoma-with-discrete-enlargements-of-all-extraocular-muscles-bilaterally-in-patient-with-moon-face-countenance
#12
Hideaki Kawakami, Kiyofumi Mochizuki, Hideko Goto, Naoki Watanabe, Takuji Tanaka
Purpose. To report our findings in a case of orbital T-cell lymphoma in which all of the extraocular muscles (EOMs) were bilaterally and discretely enlarged and the patient had a moon face countenance. Case. A 59-year-old woman presented with visual disturbances in her left eye, hyperemia in both eyes, and a moon face countenance. Examinations showed limited upward gaze in the right eye, blepharoptosis, hypertropia, and limited downward and rightward gaze in the left eye. Slit-lamp examination showed only chemosis and hyperemia of both eyes...
2017: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/28485482/deletion-of-sarm1-gene-is-neuroprotective-in-two-models-of-peripheral-neuropathy
#13
Elliot Turkiew, Debbie Falconer, Nicole Reed, Ahmet Höke
Distal axon degeneration seen in many peripheral neuropathies is likely to share common molecular mechanisms with Wallerian degeneration. Although several studies in mouse models of peripheral neuropathy showed prevention of axon degeneration in the slow Wallerian degeneration (Wlds) mouse, the role of a recently identified player in Wallerian degeneration, Sarm1, has not been explored extensively. In this study we show that mice lacking the Sarm1 gene are resistant to distal axonal degeneration in a model of chemotherapy induced peripheral neuropathy caused by paclitaxel and a model of high fat diet induced putative metabolic neuropathy...
May 9, 2017: Journal of the Peripheral Nervous System: JPNS
https://www.readbyqxmd.com/read/28484425/protein-digestion-derived-peptides-and-the-peripheral-regulation-of-food-intake
#14
REVIEW
Juliette Caron, Dorothée Domenger, Pascal Dhulster, Rozenn Ravallec, Benoit Cudennec
The gut plays a central role in energy homeostasis. Food intake regulation strongly relies on the gut-brain axis, and numerous studies have pointed out the significant role played by gut hormones released from enteroendocrine cells. It is well known that digestive products of dietary protein possess a high satiating effect compared to carbohydrates and fat. Nevertheless, the processes occurring in the gut during protein digestion involved in the short-term regulation of food intake are still not totally unraveled...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28483667/effect-of-brain-derived-neurotrophic-factor-bdnf-on-hepatocyte-metabolism
#15
Yoni Genzer, Nava Chapnik, Oren Froy
Brain-derived neurotrophic factor (BDNF) plays crucial roles in the development, maintenance, plasticity and homeostasis of the central and peripheral nervous systems. Perturbing BDNF signaling in mouse brain results in hyperphagia, obesity, hyperinsulinemia and hyperglycemia. Currently, little is known whether BDNF affects liver tissue directly. Our aim was to determine the metabolic signaling pathways activated after BDNF treatment in hepatocytes. Unlike its effect in the brain, BDNF did not lead to activation of the liver AKT pathway...
May 5, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28479249/ptp1b-deficiency-improves-hypothalamic-insulin-sensitivity-resulting-in-the-attenuation-of-agrp-mrna-expression-under-high-fat-diet-conditions
#16
Mariko Sugiyama, Ryoichi Banno, Akira Mizoguchi, Takashi Tominaga, Taku Tsunekawa, Takeshi Onoue, Daisuke Hagiwara, Yoshihiro Ito, Yoshiaki Morishita, Shintaro Iwama, Motomitsu Goto, Hidetaka Suga, Hiroshi Arima
Hypothalamic insulin receptor signaling regulates energy balance and glucose homeostasis via agouti-related protein (AgRP). While protein tyrosine phosphatase 1B (PTP1B) is classically known to be a negative regulator of peripheral insulin signaling by dephosphorylating both insulin receptor β (IRβ) and insulin receptor substrate, the role of PTP1B in hypothalamic insulin signaling remains to be fully elucidated. In the present study, we investigated the role of PTP1B in hypothalamic insulin signaling using PTP1B deficient (KO) mice in vivo and ex vivo...
June 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28476623/syringin-attenuates-insulin-resistance-via-adiponectin-mediated-suppression-of-low-grade-chronic-inflammation-and-er-stress-in-high-fat-diet-fed-mice
#17
Bobae Kim, Min-Seok Kim, Chang-Kee Hyun
In the treatment of type 2 diabetes, improvements in glucose control are often linked to side effects such as weight gain and altered lipid metabolism, increasing the risk of cardiovascular disease. It is therefore important to develop antidiabetic drugs that exert beneficial effects on insulin sensitivity and lipid metabolism at the same time. Here we demonstrate that syringin, a naturally occurring glucoside, improves glucose tolerance without increased weight gain in high-fat diet-induced obese mice. Syringin augmented insulin-stimulated Akt phosphorylation in skeletal muscle, epididymal adipose tissue (EAT), and the liver, showing an insulin-sensitizing activity...
June 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28473058/increased-cytokine-production-by-monocytes-from-human-subjects-who-consumed-grape-powder-was-not-mediated-by-differences-in-dietary-intake-patterns
#18
Susan J Zunino, Nancy L Keim, Darshan S Kelley, Ellen L Bonnel, Elaine C Souza, Janet M Peerson
Recently, in a randomized, double-blind crossover study, we reported that consumption of grape powder by obese human subjects increased the production of the proinflammatory cytokines interleukin (IL)-1β and IL-6 by peripheral blood monocytes after ex vivo stimulation with bacterial lipopolysaccharide compared with the placebo treatment. We hypothesized that dietary grape powder increased the production of these cytokines by stimulated monocytes. To test this hypothesis, we used 24-hour dietary recall data to determine if differences in dietary patterns played a role in increased cytokine production...
April 2017: Nutrition Research
https://www.readbyqxmd.com/read/28472467/hypothalamic-regulation-of-liver-and-muscle-nutrient-partitioning-by-brain-specific-carnitine-palmitoyltransferase-1c-cpt1c-in-male-mice
#19
Macarena Pozo, Rosalía Rodríguez-Rodríguez, Sara Ramírez, Patricia Seoane-Collazo, Miguel López, Dolors Serra, Laura Herrero, Núria Casals
Carnitine palmitoyltransferase 1C (CPT1C), a brain-specific protein localized in the endoplasmic reticulum of neurons, is expressed in almost all brain regions. Based on global knockout (KO) models, CPT1C has demonstrated relevance in hippocampus-dependent spatial learning as well as in hypothalamic regulation of energy balance. Specifically, it has been shown that CPT1C is protective against high-fat diet-induced obesity (DIO), and that CPT1C KO mice show reduced peripheral fatty acid oxidation (FAO) both during fasting and DIO...
May 3, 2017: Endocrinology
https://www.readbyqxmd.com/read/28471941/basic-science-and-pathogenesis-of-ageing-with-hiv-potential-mechanisms-and-biomarkers
#20
Claire Lagathu, Andrea Cossarizza, Véronique Béréziat, Milena Nasi, Jacqueline Capeau, Marcello Pinti
: The increased prevalence of age-related comorbidities and mortality is worrisome in ageing HIV-infected patients. Here, we aim to analyse the different ageing mechanisms with regard to HIV infection. Ageing results from the time-dependent accumulation of random cellular damage. Epigenetic modifications and mitochondrial DNA haplogroups modulate ageing. In antiretroviral treatment-controlled patients, epigenetic clock appears to be advanced, and some haplogroups are associated with HIV infection severity. Telomere shortening is enhanced in HIV-infected patients because of HIV and some nucleoside analogue reverse transcriptase inhibitors...
June 1, 2017: AIDS
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