keyword
MENU ▼
Read by QxMD icon Read
search

Hypoxia Insulin

keyword
https://www.readbyqxmd.com/read/28933059/function-and-dysfunction-of-adipose-tissue
#1
Paulo Matafome, Raquel Seiça
Adipose tissue is an endocrine organ which is responsible for postprandial uptake of glucose and fatty acids, consequently producing a broad range of adipokines controlling several physiological functions like appetite, insulin sensitivity and secretion, immunity, coagulation, and vascular tone, among others. Many aspects of adipose tissue pathophysiology in metabolic diseases have been described in the last years. Recent data suggest two main factors for adipose tissue dysfunction: accumulation of nonesterified fatty acids and their secondary products and hypoxia...
2017: Advances in Neurobiology
https://www.readbyqxmd.com/read/28928383/human-stem-cells-alter-the-invasive-properties-of-somatic-cells-via-paracrine-activation-of-mtorc1
#2
Margit Rosner, Ha Thi Thanh Pham, Richard Moriggl, Markus Hengstschläger
Controlled invasion is essential during many physiological processes, whereas its deregulation is a hallmark of cancer. Here we demonstrate that embryonic, induced pluripotent and amniotic fluid stem cells share the property to induce the invasion of primary somatic cells of various origins through insulin-like growth factor I (IGF-I)- or II (IGF-II)-mediated paracrine activation of mechanistic target of rapamycin complex 1 (mTORC1). We propose a model in which downstream of mTORC1 this stem cell-induced invasion is mediated by hypoxia-inducible factor 1-alpha (HIF-1α)-regulated matrix metalloproteinases...
September 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28923650/does-renal-tubular-injury-induced-local-tissue-hypoxia-involve-post-transplantation-erythrocytosis
#3
A Unal, S Ata, C Karakurkcu, M Z Ciraci, I Kocyigit, M H Sipahioglu, B Tokgoz, O Oymak
BACKGROUND: The pathogenesis of post-transplantation erythrocytosis (PTE) is not well understood and appears to be multifactorial. Our hypothesis in this study was that several factors, including toxicity of calcineurin inhibitor, immunologic factors, and chronic allograft nephropathy, can trigger local tissue hypoxia in peritubular interstitium, which is where production of erythropoietin (EPO) takes place. This local interstitial tissue hypoxia can cause an increase in renal EPO production, which induces the development of PTE...
October 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28898528/post-transplant-oxygen-inhalation-improves-the-outcome-of-subcutaneous-islet-transplantation-a-promising-clinical-alternative-to-the-conventional-intrahepatic-site
#4
H Komatsu, J Rawson, A Barriga, N Gonzalez, D Mendez, J Li, K Omori, F Kandeel, Y Mullen
Subcutaneous tissue is a promising site for islet transplantation, due to its large area and accessibility, which allows minimally invasive procedures for transplantation, graft monitoring, and removal of malignancies as needed. However, relative to the conventional intrahepatic transplantation site, the subcutaneous site requires a large number of islets to achieve engraftment success and diabetes reversal, due to hypoxia and low vascularity. We report that the efficiency of subcutaneous islet transplantation in a Lewis rat model is significantly improved by treating recipients with inhaled 50% oxygen, in conjunction with prevascularization of the graft bed by agarose-bFGF...
September 12, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28894286/intermittent-hypoxia-induced-insulin-resistance-is-associated-with-alterations-in-white-fat-distribution
#5
Laureline Poulain, Hervé Mathieu, Amandine Thomas, Anne-Laure Borel, Chantal Remy, Patrick Levy, Claire Arnaud, Maurice Dematteis
Sleep apnea syndrome is characterized by repetitive upper airway collapses during night leading to intermittent hypoxia (IH). The latter is responsible for metabolic disturbances that rely, at least in part, on abdominal white fat inflammation. Besides qualitative alterations, we hypothesized that IH could also modify body fat distribution, a key factor for metabolic complications. C57BL6 mice exposed to IH (21-5% FiO2, 60 s cycle, 8 h/day) or air for 6 weeks were investigated for topographic fat alterations (whole-body MRI)...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28888981/hypoxia-in-3t3-l1-adipocytes-suppresses-adiponectin-expression-via-the-perk-and-ire1-unfolded-protein-response
#6
Qian Guo, Sanli Jin, Hailong Hu, Ying Zhou, Yuheng Yan, He Zong, Yu Wang, Hongjuan He, Yuri Oh, Chuanpeng Liu, Ning Gu
Adiponectin, an adipocytokine produced by adipocytes, functions as an anti-inflammatory and anti-apoptotic substance, while also enhancing insulin sensitivity. Patients or model animals with obesity or diabetes typically present attenuated expression of adiponectin. Moreover, obesity and diabetes are often accompanied with hypoxia in adipose tissue, which may result in endoplasmic reticulum (ER) stress as well as low expression of adiponectin. The purpose of this study was to investigate the specific role of the unfolded protein response (UPR) involved in the low expression of adiponectin induced by hypoxia...
September 6, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28886098/molecular-and-biochemical-responses-of-hypoxia-exposure-in-atlantic-croaker-collected-from-hypoxic-regions-in-the-northern-gulf-of-mexico
#7
Md Saydur Rahman, Peter Thomas
A major impact of global climate change has been the marked increase worldwide in the incidence of coastal hypoxia (dissolved oxygen, DO<2.0 mg l-1). However, the extent of hypoxia exposure to motile animals such as fish collected from hypoxic waters as well as their molecular and physiological responses to environmental hypoxia exposure are largely unknown. A suite of potential hypoxia exposure biomarkers was evaluated in Atlantic croaker collected from hypoxic and normoxic regions in the northern Gulf of Mexico (nGOM), and in croaker after laboratory exposure to hypoxia (DO: 1...
2017: PloS One
https://www.readbyqxmd.com/read/28882901/chronic-intermittent-hypoxia-impairs-insulin-sensitivity-but-improves-whole-body-glucose-tolerance-by-activating-skeletal-muscle-ampk
#8
Amandine Thomas, Elise Belaidi, Sophie Moulin, Sandrine Horman, Gerard C van der Zon, Benoit Viollet, Patrick Levy, Luc Bertrand, Jean-Louis Pepin, Diane Godin-Ribuot, Bruno Guigas
Obstructive sleep apnea syndrome is a highly prevalent disease resulting in transient respiratory arrest and chronic intermittent hypoxia (cIH). cIH is associated with insulin resistance and impaired metabolic homeostasis in both rodents and humans but the exact underlying mechanism(s) remains unclear. In the present study, we investigated the effects of two weeks of cIH (1min cycle, FiO2 21-5%, 8h/day) on whole-body insulin sensitivity and glucose tolerance in lean mice. Although food intake and body weight were reduced when compared to normoxia, cIH induced systemic insulin resistance in a hypoxia-inducible factor-1α-independent manner and impaired insulin signaling in liver, white adipose tissue and skeletal muscle...
September 7, 2017: Diabetes
https://www.readbyqxmd.com/read/28877872/insulin-sensitivity-leptin-adiponectin-resistin-and-testosterone-in-adult-male-and-female-rats-after-maternal-neonatal-separation-and-environmental-stress
#9
Hershel Raff, Brian Hoeynck, Mack Jablonski, Cole Leonovicz, Jonathan M Phillips, Ashley L Gehrand
Care of premature infants often requires parental and caregiver separation particularly during hypoxic and hypothermic episodes. We have established a neonatal rat model of human prematurity involving maternal-neonatal separation and hypoxia with spontaneous hypothermia prevented with external heat. Adults previously exposed to these neonatal stressors show a sex difference in the insulin and glucose response to arginine stimulation suggesting a state of insulin resistance. The current study used this cohort of adult rats to evaluate insulin resistance (Homeostatic Model Assessment of Insulin Resistance [HOMA-IR]), plasma adipokines (reflecting insulin resistance states), and testosterone...
September 6, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28867579/socs2-exacerbates-myocardial-injury-induced-by-ischemia-reperfusion-in-diabetic-mice-and-h9c2-cells-through-inhibiting-the-jak-stat-igf-1-pathway
#10
Mengting Sheng, Zirui Huang, Liming Pan, Min Yu, Cai Yi, Lin Teng, Ling He, Chen Gu, Chunli Xu, Junming Li
AIMS: This study aimed to investigate potential candidates and molecular mechanisms of myocardial ischemia/reperfusion (I/R) injury (MIRI) in type 2 diabetes mellitus. MAIN METHODS: Type 2 diabetic and myocardial I/R mouse models were established with a high fat-diet (HFD) for 24weeks and subjecting to global ischemia/reperfusion for 1h/3h, respectively. Microarray analysis was applied to screen differentially expressed genes (DEGs) in the hearts of these mice. Moreover, H9c2 cells were treated with high glucose (HG) and/or hypoxia and reoxygenation (H/R)...
August 31, 2017: Life Sciences
https://www.readbyqxmd.com/read/28862673/igf-1-attenuates-hypoxia-induced-atrophy-but-inhibits-myoglobin-expression-in-c2c12-skeletal-muscle-myotubes
#11
Eva L Peters, Sandra M van der Linde, Ilse S P Vogel, Mohammad Haroon, Carla Offringa, Gerard M J de Wit, Pieter Koolwijk, Willem J van der Laarse, Richard T Jaspers
Chronic hypoxia is associated with muscle wasting and decreased oxidative capacity. By contrast, training under hypoxia may enhance hypertrophy and increase oxidative capacity as well as oxygen transport to the mitochondria, by increasing myoglobin (Mb) expression. The latter may be a feasible strategy to prevent atrophy under hypoxia and enhance an eventual hypertrophic response to anabolic stimulation. Mb expression may be further enhanced by lipid supplementation. We investigated individual and combined effects of hypoxia, insulin-like growth factor (IGF)-1 and lipids, in mouse skeletal muscle C2C12 myotubes...
September 1, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28835854/retinal-and-choroidal-angiogenesis-a-review-of-new-targets
#12
REVIEW
Thiago Cabral, Luiz Guilherme M Mello, Luiz H Lima, Júlia Polido, Caio V Regatieri, Rubens Belfort, Vinit B Mahajan
Retinal and choroidal neovascularization are a major cause of significant visual impairment, worldwide. Understanding the various factors involved in the accompanying physiopathology is vital for development of novel treatments, and most important, for preserving patient vision. The intraocular use of anti-vascular endothelial growth factor therapeutics has improved management of the retinal and choroidal neovascularization but some patients do not respond, suggesting other vascular mediators may also contribute to ocular angiogenesis...
2017: International Journal of Retina and Vitreous
https://www.readbyqxmd.com/read/28832685/oxygen-environment-and-islet-size-are-the-primary-limiting-factors-of-isolated-pancreatic-islet-survival
#13
Hirotake Komatsu, Colin Cook, Chia-Hao Wang, Leonard Medrano, Henry Lin, Fouad Kandeel, Yu-Chong Tai, Yoko Mullen
BACKGROUND: Type 1 diabetes is an autoimmune disease that destroys insulin-producing beta cells in the pancreas. Pancreatic islet transplantation could be an effective treatment option for type 1 diabetes once several issues are resolved, including donor shortage, prevention of islet necrosis and loss in pre- and post-transplantation, and optimization of immunosuppression. This study seeks to determine the cause of necrotic loss of isolated islets to improve transplant efficiency. METHODOLOGY: The oxygen tension inside isolated human islets of different sizes was simulated under varying oxygen environments using a computational in silico model...
2017: PloS One
https://www.readbyqxmd.com/read/28832184/type-1-diabetes-at-high-altitude-performance-of-personal-insulin-pumps-and-patient-metabolic-control
#14
Bartłomiej Matejko, Andrzej Gawrecki, Marta Wróbel, Jerzy Hohendorff, Teresa Benbenek-Klupa, Maciej T Malecki, Dorota Zozulińska-Ziółkiewicz, Tomasz Klupa
High-altitude trekking can expose people to extreme environmental conditions, like low temperatures and hypobaric hypoxia. Such extreme conditions make it more difficult for people with type 1 diabetes mellitus (T1DM) to maintain glycemic control. Intensive blood glucose monitoring using either glucose meters or continuous systems is imperative in these cases. In this observational study, we report metabolic control of T1DM patients and the performance of various insulin pumps at high altitude. All 19 patients with T1DM included in this study participated in the final step of the "5000 meters above sugar level" initiative, which involved trekking Damavand Mountain to an altitude of 5670 meters above sea level...
August 23, 2017: Diabetes Technology & Therapeutics
https://www.readbyqxmd.com/read/28827350/topological-impact-of-noncanonical-dna-structures-on-klenow-fragment-of-dna-polymerase
#15
Shuntaro Takahashi, John A Brazier, Naoki Sugimoto
Noncanonical DNA structures that stall DNA replication can cause errors in genomic DNA. Here, we investigated how the noncanonical structures formed by sequences in genes associated with a number of diseases impacted DNA polymerization by the Klenow fragment of DNA polymerase. Replication of a DNA sequence forming an i-motif from a telomere, hypoxia-induced transcription factor, and an insulin-linked polymorphic region was effectively inhibited. On the other hand, replication of a mixed-type G-quadruplex (G4) from a telomere was less inhibited than that of the antiparallel type or parallel type...
August 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28819004/acute-oxygen-sensing-by-the-carotid-body-from-mitochondria-to-plasma-membrane
#16
Andy J Chang
Maintaining oxygen homeostasis is crucial to the survival of animals. Mammals respond acutely to changes in blood oxygen levels by modulating cardiopulmonary function. The major sensor of blood oxygen that regulates breathing is the carotid body (CB), a small chemosensory organ located at the carotid bifurcation. When arterial blood oxygen levels drop in hypoxia, neuroendocrine cells in the CB called glomus cells are activated to signal to afferent nerves that project to the brainstem. The mechanism by which hypoxia stimulates CB sensory activity has been the subject of many studies over the last 90 years...
August 17, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28811274/hypoxia-in-combination-with-muscle-contraction-improves-insulin-action-and-glucose-metabolism-in-human-skeletal-muscle-via-the-hif-1%C3%AE-pathway
#17
Sven W Görgens, Tim Benninghoff, Kristin Eckardt, Christian Springer, Alexandra Chadt, Anita Melior, Jakob Wefers, Andrea Cramer, Jørgen Jensen, Kåre I Birkeland, Christian A Drevon, Hadi Al-Hasani, Jürgen Eckel
Skeletal muscle insulin resistance is the hallmark of type 2 diabetes, and develops long before the onset of the disease. It is well accepted that physical activity improves glycemic control but the knowledge on underlying mechanisms mediating the beneficial effects remains incomplete. Exercise is accompanied by a decrease in intramuscular oxygen levels resulting in induction of HIF-1α. HIF-1α is a master regulator of gene expression and might play an important role in skeletal muscle function and metabolism...
August 15, 2017: Diabetes
https://www.readbyqxmd.com/read/28810235/obesity-as-a-conditioning-factor-for-high-altitude-diseases
#18
Rocío San Martin, Julio Brito, Patricia Siques, Fabiola León-Velarde
Obesity, a worldwide epidemic, has become a major health burden because it is usually accompanied by an increased risk for insulin resistance, diabetes, hypertension, cardiovascular diseases, and even some kinds of cancer. It also results in associated increases in healthcare expenditures and labor and economic consequences. There are also other fields of medicine and biology where obesity or being overweight play a major role, such as high-altitude illnesses (acute mountain sickness, hypoxic pulmonary hypertension, and chronic mountain sickness), where an increasing relationship among these two morbid statuses has been demonstrated...
2017: Obesity Facts
https://www.readbyqxmd.com/read/28808079/the-impact-of-iugr-on-pancreatic-islet-development-and-%C3%AE-cell-function
#19
REVIEW
Brit H Boehmer, Sean W Limesand, Paul J Rozance
Placental insufficiency is a primary cause of intrauterine growth restriction (IUGR). IUGR increases the risk of developing type 2 diabetes mellitus (T2DM) throughout life, which indicates that insults from placental insufficiency impair β-cell development during the perinatal period because β-cells have a central role in the regulation of glucose tolerance. The severely IUGR fetal pancreas is characterized by smaller islets, less β-cells, and lower insulin secretion. Because of the important associations among impaired islet growth, β-cell dysfunction, impaired fetal growth, and the propensity for T2DM, significant progress has been made in understanding the pathophysiology of IUGR and programing events in the fetal endocrine pancreas...
November 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28803916/mitigating-ischemic-injury-of-stem-cell-derived-insulin-producing-cells-after-transplant
#20
Gaetano Faleo, Holger A Russ, Steven Wisel, Audrey V Parent, Vinh Nguyen, Gopika G Nair, Jonathan E Freise, Karina E Villanueva, Gregory L Szot, Matthias Hebrok, Qizhi Tang
The advent of large-scale in vitro differentiation of human stem cell-derived insulin-producing cells (SCIPC) has brought us closer to treating diabetes using stem cell technology. However, decades of experiences from islet transplantation show that ischemia-induced islet cell death after transplant severely limits the efficacy of the therapy. It is unclear to what extent human SCIPC are susceptible to ischemia. In this study, we show that more than half of SCIPC die shortly after transplantation. Nutrient deprivation and hypoxia acted synergistically to kill SCIPC in vitro...
September 12, 2017: Stem Cell Reports
keyword
keyword
64721
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"