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Heart and Metabolism Non-invasive metabolic imaging of ischaemia using FDG and PET basically relies on the simple observation that glucose utilization by the myocardium is increased during ischaemic conditions. The increased glucose uptake is not sustained by ischaemia, since coronary flow was comparable to that of control values, and could reflect either an increased glycolytic flux and/or an increased rate of glycogen synthesis due to depletion of the polysaccharide induced by ischaemia. Glucose uptake was similarly low in normal subjects and patients with stable angina, but was significantly increased in patients with unstable angina despite the absence of symptoms and signs of myocardial ischaemia at the time of PET. www.heartandmetabolism.org /issues/HM7/hm7_metabolic_imaging.asp   (1540 words)

[No title] The metabolism of glucose in skeletal muscle is controlled to a large extent by the transport of glucose across the cell membrane, which takes place by facilitated diffusion. Translocation to the T-tubule membrane may serve an important function by reducing the diffusion distance for glucose to reach the hexokinase enzyme which is associated with mitochondria in the center of the muscle between myofibrils and serves to quickly phosphorylate glucose to glucose-6-phosphate, thereby trapping glucose in the cell. Moreover, glucose transporters do not appear to be regulated by phosphorylation, and thus the mechanism of signal transduction from the receptor to glucose transporters and their translocation to the cell membrane has yet to be described at the molecular level. www.sportsci.org /encyc/drafts/Muscle_glucose_metabol.doc   (3448 words)

Muscle Physiology - Glucose Metabolism Two different pathways are involved in the metabolism of glucose: one anaerobic and one aerobic. Glucose in the bloodstream diffuses into the cytoplasm and is locked there by phosphorylation. A glucose molecule is then rearranged slightly to fructose and phosphorylated again to fructose diphosphate. muscle.ucsd.edu /musintro/glucose.shtml   (364 words)

Glycolysis Under various conditions of glucose deficiency, such as long periods between meals, the liver is stimulated to supply the blood with glucose through the pathway of gluconeogenesis. The metabolic result of the phosphorylation of the bifunctional enzyme is that allosteric stimulation of PFK-1 ceases, allosteric inhibition of F-1,6-BPase is eliminated, and net flow of fructose through these two enzymes is gluconeogenic, producing F6P and eventually glucose. Thus, the ability of an individual to metabolize ethanol is dependent upon the capacity of hepatocytes to carry out eother of these 2 shuttles, which in turn is affected by the rate of the TCA cycle in the mitochondria whose rate of function is being impacted by the NADH produced by the AcDH reaction. web.indstate.edu /thcme/mwking/glycolysis.html   (4616 words)

NEJM -- Cerebral glucose metabolism in adults with hyperactivity of childhood onset Global cerebral glucose metabolism was 8.1 percent lower in the adults with hyperactivity than in the normal controls (mean +/- SD, 9.05 +/- 1.20 mg per minute per 100 g vs. 9.85 +/- 1.68 mg per minute per 100 g; P = 0.034). In the adults with hyperactivity, glucose metabolism was significantly reduced, as compared with the values for the controls, in 30 of 60 specific regions of the brain (P less than 0.05). Among the regions of the brain with the greatest reductions in glucose metabolism were the premotor cortex and the superior prefrontal cortex. content.nejm.org /cgi/content/abstract/323/20/1361   (1090 words)

Supports Glucose Metabolism and Antioxidant Status Glucose Optimizer™ is a comprehensive combination of nutrients that improve glucose metabolism and antioxidant protection. On the one hand, the presence of excess glucose in the blood interferes with the use of fat for energy and, through the action of the liver, elevates the level of triglycerides and their storage as fat. Alpha-lipoic acid inhibits the inappropriate release of glucose by the liver, such as when the liver releases yet more glucose into the blood even as the pancreas is releasing insulin to help clear the glucose already present. www.advancedvitametric.com /Glucose_Optimizer.html   (1415 words)

Metabolism Glucose is phosphorylated to glucose 6-phosphate, then converted to glucose 1-phosphate, then to uridine diphosphate glucose, and finally to glycogen. Glucose Release/Glycogenolysis: Glycogen stored in hepatocytes is broken down into glucose and released into the blood to be transported to cells, where it will be catabolyzed. The primary hormone regulating the metabolic reactions and membrane transport activities of the absorptive state is insulin. www1.fccj.edu /sspring/metabolism1.htm   (1538 words)

Glucose transporter - Wikipedia, the free encyclopedia Glucose is an essential substrate for the metabolism of most cells. Transport of glucose through the apical membrane of intestinal and kidney epithelial cells depends on the presence of secondary active Na+/glucose symporters, SGLT-1 and SGLT-2, which concentrate glucose inside the cells, using the energy provided by cotransport of Na+ ions down their electrochemical gradient (Hediger and Rhoads 1994). Facilitated diffusion of glucose through the cellular membrane is otherwise catalyzed by glucose carriers (protein symbol GLUT, gene symbol SLC2 for Solute Carrier Family 2) that belong to a superfamily of transport facilitators (major facilitator superfamily) including organic anion and cation transporters, yeast hexose transporter, plant hexose/proton symporters, and bacterial sugar/proton symporters (Henderson 1993). en.wikipedia.org /wiki/Glucose_transporter   (673 words)

FFA and glucose metabolism The authors proposed that while regulation of glucose fluxes by hyperglycemia may occur in both non-diabetic individuals and in patients with type 2 diabetes, it may be activated at a higher set point in the latter and increased FFA levels might contribute to this altered set point. A further advance in our understanding about the relationship between the b-cell response to glucose and plasma FFA levels is related to the fact that this system seems to operate particularly in prediabetic individuals with a known impaired b-cell response to glucose. Despite the negative impact of FFA on insulin-mediated glucose uptake, there is a lack of data on the effect of FFA on glucose effectiveness. www.d4pro.com /idm/site/ffa_and_glucose_metabolism.htm   (1002 words)

Glycolysis - Wikipedia, the free encyclopedia As the foundation of both aerobic and anaerobic respiration, glycolysis is the archetype of universal metabolic processes known and occurs (with variations) in many types of cells in nearly all organisms. Glucose may alternatively be from the hydrolysis of intracellular starch or glycogen. From an anabolic metabolism perspective, the NADH has a role to drive synthetic reactions, doing so by directly or indirectly reducing the pool of NADP+ in the cell to NADPH, which is another important reducing agent for biosynthetic pathways in a cell. en.wikipedia.org /wiki/Glycolysis   (3189 words)

|| DukeMedNews || Glucose Metabolism in Diabetics Further Impaired by Caffeine In this population, decreases in insulin sensitivity could result in exaggerated hyperglycemic responses to glucose that would aggravate the glycemic dysregulation that is a hallmark of this disease. Diabetics, however, do not metabolize glucose as efficiently," said James D. Lane, Ph.D., associate research professor in the department of psychiatry and behavioral sciences at Duke, and lead author of the study. However, after consuming the carbohydrates in the liquid meal, those who were given caffeine experienced a 21 percent increase in their glucose level and a 48 percent increase in their insulin level. www.dukemednews.org /news/article.php?id=7946   (737 words)

Diabetes Research Summary - Most Stroke Patients Have Problems With Glucose Metabolism - American Diabetes Association Disorders of glucose metabolism in acute stroke patients: an underrecognized problem, by K. Matz and colleagues. A test for glucose problems could not be performed in all of the stroke patients because of stroke-related problems. Glucose levels were higher in the first week than in the second week after having a stroke. www.diabetes.org /diabetes-research/summaries/matz-stroke-patients.jsp   (259 words)

Cell Metabolism Online   (Site not responding. Last check: 2007-10-08) The metabolic demands and synthetic capacity of the lactating mammary gland exceed that of any other tissue, thereby providing a useful paradigm for understanding the developmental regulation of cellular metabolism. Whereas cellular proliferation, differentiation, and apoptosis are unaffected, loss of Akt1 disrupts the coordinate regulation of metabolic pathways that normally occurs at the onset of lactation. These findings demonstrate that Akt1 is required in an isoform-specific manner for orchestrating many of the developmental changes in cellular metabolism that occur at the onset of lactation and establish a role for Akt1 in glucose metabolism. www.cellmetabolism.org   (288 words)

Mass spectrometry service to assess glucose metabolism, glucose kinetics, gluconeogenesis, and kreb cycle using stable ... Metabolic Solutions offers project design assistance and a mass spectrometry service to help researchers study glucose metabolism using stable isotope methods. This approach can be used to explore whole body glucose homeostasis under various perturbations such as exogenous infusions of glucose and insulin. Glucose and fructose recycling rates can be measured in addition to glucose flux and production rate. www.metsol.com /glucose.htm   (533 words)

3.1 Overview of glucose metabolism Glycogen is a polymeric storage form of glucose, not unlike starch which is found in plants. In the liver, the glucose generated from glycogen is released into the general circulation. This pathway turns pyruvate derived from amino acids into glucose; it thus is essentially the reversal of glycolysis. watcut.uwaterloo.ca /webnotes/Metabolism/page-3.1.html   (312 words)

Glucose Metabolism Defect In Rare Form Of Diabetes Revealed   (Site not responding. Last check: 2007-10-08) Diabetes affects the way food is metabolized and broken down into a simple sugar called glucose. When glucose increases in the bloodstream -- for example, after eating -- a molecule on the beta cell called the glucose transporter-2 takes up the sugar. As glucose increases in the blood, more glucose is taken up by cells and metabolized and insulin secretion increases. www.pslgroup.com /dg/490ae.htm   (848 words)

Liver in Intermediary Metabolism The liver removes glucose from the blood stream and stores it when blood glucose concentrations are high and releases glucose into the blood when the concentration falls. The following diagram (Figure 1) summarises the metabolic pathways that are active in the liver after a meal that result in the storage of glucose as glycogen or fat, or the oxidation of glucose for energy via the glycolytic pathway and citric acid cycle. Draw a diagram showing the main pathways of glucose metabolism, amino acid metabolism and fatty acid synthesis in the liver that will be active after a meal. florey.biosci.uq.edu.au /GMC/liver1.html   (911 words)

BioMed Central | Full text | Effect of green tea on blood glucose levels and serum proteomic patterns in diabetic ... The amelioration of insulin resistance by green tea is associated with the increased expression level of glucose transporter IV in a fructose-fed rat [3]. Some constituent components have been shown to enhance the basal and insulin-stimulated glucose uptake of rat adipocytes [5], to inhibit intestinal glucose uptake by inhibiting the sodium-dependent glucose transporter of rabbit intestinal epithelial cells [6], and to reduce serum glucose level in alloxan-diabetic rats [7]. In detail, glucose metabolism increased in 14 participants, remained unchanged in 3 participants, and worsened in 5 participants. www.biomedcentral.com /1471-2210/4/18   (4193 words)

Nutrition & Metabolism | Full text | Resistant starch consumption promotes lipid oxidation No difference in fasting or postprandial insulin, glucose, FFA, or triglyceride concentration was observed between any of the RS doses examined (Figure 1). Thus, the glucose- and insulin-lowering effects of RS that have been observed in other studies may be due to changes in fiber and/or fat between test meals which have been extensively shown to lower postprandial glycemic and insulinemic responses. Metabolic processes that are non-linear functions include the level of illuminance and plasma melatonin levels [24], caffeine intake versus plasma caffeine metabolite concentrations [25], allergen exposure (concentration) and histamine response [26], zinc-stimulated histamine release from mast cells [27], and fructose-1,6-diphosphate metabolism in cardiomyocytes [28]. www.nutritionandmetabolism.com /content/1/1/8   (5265 words)

Nutrition & Metabolism | Full text | Enhancing energy and glucose metabolism by disrupting triglyceride synthesis: ... WAT conferred partial obesity resistance (Figure 2A), enhanced glucose disposal after a glucose load (Figure 2B), and increased activation of the insulin signaling pathway in WT recipient mice [7,10]. In these various knockout models, glucose disposal does not appear to have a strong correlation with levels of plasma free fatty acids, which have been hypothesized to be an important correlative of insulin resistance. Metabolic Syndrome may be defined by the response to carbohydrate restriction. www.nutritionandmetabolism.com /content/3/1/10   (2275 words)

UCDHSC Clinical Nutrition Research Lab - Glucose/Glycerol Metabolism This approach is particularly useful for exploring whole body glucose homeostasis under perturbations such as infusions of glucose and insulin. Glucose production rates and flux can be calculated when a known amount of glucose tracer is administered. C-labeled glucose is used to compute the rate of glucose oxidation. www.uchsc.edu /bioanalytics/services/glucose-glycerol-analysis.shtml   (284 words)

Abnormal glucose metabolism may contribute to chronic nerve disorder According to the two-hour oral glucose tolerance test, 62 patients (62 percent) with neuropathy had abnormal fasting glucose metabolism, including 24 with undiagnosed diabetes. (This compares with 33 percent of patients of similar ages in the general population with abnormal glucose metabolism as previously estimated by the Centers for Disease Control and Prevention in other published reports.) The results of the current study suggest that abnormal glucose metabolism may be a risk factor for neuropathy. Recent studies suggest that the neuropathy associated with impaired glucose tolerance may be milder than neuropathies traditionally associated with diabetes mellitus and may be the earliest detectable sign of abnormal glucose metabolism." www.eurekalert.org /pub_releases/2006-06/jaaj-agm060806.php   (364 words)

Non-Glucose Carbons in Glycolysis Essential fructosuria is a benign metabolic disorder caused by the lack of fructokinase which is normally present in the liver, pancreatic islets and kidney cortex. Galactose, which is metabolized from the milk sugar, lactose (a disaccharide of glucose and galactose), enters glycolysis by its conversion to glucose-1-phosphate (G1P). Glucuronate is derived from glucose in the uronic acid pathway. web.indstate.edu /thcme/mwking/non-glucose-sugar-metabolism.html   (1309 words)

Metabolism Human must take the glucose, add oxygen to it and through a series of chemical reactions covert it into carbon dioxide, water and energy in the form of ATP. Pyruvate from glycolysis is metabolized by alternate pathways. Free glucose is used until it runs low, then glycogen reserves are tapped. class.fst.ohio-state.edu /FST201/MEM/metaboli.htm   (582 words)

Alterations in basal glucose metabolism during late pregnancy in the conscious dog -- Connolly et al. 279 (5): E1166 -- ... glucose oxidation is assumed to be constant at 1.7 µmol · kg Arterial plasma glucose was not significantly different between the two groups (5.9 ± 0.1 and 5.6 ± 0.1 mmol/l in NP and P, respectively; Fig. Interestingly, the increase in hepatic glucose release is ajpendo.physiology.org /cgi/content/full/279/5/E1166   (7548 words)

Welcome to Karuna: Karuna Products: Glucose Metabolism Formulas   (Site not responding. Last check: 2007-10-08) Chromium performs an essential role in glucose metabolism by increasing the sensitivity of the insulin receptors on the surface of most cells (Acc Chem Res 2000;33:503-510). Magnesium, which has been found in subnormal levels in blood and tissues of diabetics, has important roles in normal carbohydrate metabolism; magnesium supplementation improves glucose metabolism in the elderly, who are typically at risk of glucose intolerance. Vitamin C is frequently low in people with glucose intolerance, and may improve their blood sugar and lipid metabolism. www.karunahealth.com /p_glucoform.asp   (995 words)

Abnormalities of Glucose Metabolism, Including Insulin Resistance Hruz reported that Glut-4 is the primary mediator of stimulated glucose uptake in vivo; Hruz suggested that indinavir induced peripheral insulin resistance. Hruz also said that PI drug levels at the time of glucose tolerance testing may be critical to the measurement of insulin resistance. But insulin also acts on the liver cells which produce glucose when there is no glucose available from a recent meal or from glycogen, in a process called gluconeogenesis. www.natap.org /lipod/110201_1.htm   (2011 words)

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