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Topic: Gluconeogenesis


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  Gluconeogenesis
Gluconeogenesis is the synthesis of glucose from non-carbohydrate precursors
Gluconeogenesis is very important since it provides glucose for the brain which is absolutely dependent on glucose as its primary fuel source.
The purpose of gluconeogenesis is to synthesize glucose from non-carbohydrate precursors.
www.dentistry.leeds.ac.uk /biochem/uttb/GNEOGEN.HTM   (814 words)

  
 Gluconeogenesis
Gluconeogenesis is the biosynthesis of new glucose, (i.e.
The NADH produced during the cytosolic oxidation of malate to OAA is utilized during the glyceraldehyde-3-phosphate dehydrogenase reaction of glycolysis.
Gluconeogenesis is also controlled at the level of the pyruvate to PEP bypass.
web.indstate.edu /thcme/mwking/gluconeogenesis.html   (2301 words)

  
 Mechanism of fat-induced hepatic gluconeogenesis: effect of metformin -- Song et al. 281 (2): E275 -- AJP - ...
gluconeogenesis in response to an HFD and metformin.
Molecular physiology of the regulation of hepatic gluconeogenesis and glycolysis.
Puhakainen, I, Koivisto VA, and Yki-Jarvinen H. Lipolysis and gluconeogenesis from glycerol are increased in patients with noninsulin-dependent diabetes mellitus.
ajpendo.physiology.org /cgi/content/full/281/2/E275   (5011 words)

  
 Gluconeogenesis - Wikipedia, the free encyclopedia
Gluconeogenesis is the generation of glucose from non-sugar carbon substrates like pyruvate, lactate, glycerol, and amino acids (primarily alanine and glutamine).
Gluconeogenesis begins with the formation of oxaloacetate through carboxylation of pyruvate at the expense of one molecule of ATP, but is inhibited in the presence of high levels of ADP.
Gluconeogenesis cannot be considered to be a reverse process of glycolysis, as the three irreversible steps in glycolysis are bypassed in gluconeogenesis.
en.wikipedia.org /wiki/Gluconeogenesis   (584 words)

  
 Human kidney and liver gluconeogenesis: evidence for organ substrate selectivity -- Stumvoll et al. 274 (5): E817 -- ...
renal glutamine gluconeogenesis in vitro (65, 79), and hepatic
alanine gluconeogenesis in vivo and in vitro (18, 64), we
(31, 32, 59) and the contribution of glutamine to gluconeogenesis.
ajpendo.physiology.org /cgi/content/full/274/5/E817   (5237 words)

  
 Gluconeogenesis, glucose ...
Second, gluconeogenesis was markedly increased in both obese and non-obese diabetic subjects.
Gluconeogenesis was further enhanced, possibly related to more severe extrahepatic and hepatic insulin resistance, and resulted in an increased glucose-6-phosphate flux in glucose-producing cells.
This suggests that strategies aimed at reducing gluconeogenesis may be ineffective in reducing glycaemia in Type 2 diabetes.
www.medforum.nl /idm/gluconeogenesis_glucose.htm   (818 words)

  
 The chemical logic behind... Gluconeogenesis
Gluconeogenesis is the synthesis of glucose from other organic compounds (pyruvate, succinate, lactate, oxaloacetate, etc. Most of the reactions involved are quite similar to the reverse of glycolysis.
In gluconeogenesis, every one of these steps is replaced by thermodinamically favorable reactions.
In gluconeogenesis, the reactions catalyzed by phosphofructokinase and hexokinase are replaced by hydrolytic reactions.
www2.ufp.pt /~pedros/bq/gng.htm   (455 words)

  
 Effects of a high-fat diet and voluntary wheel running on gluconeogenesis and lipolysis in rats -- Podolin et al. 86 ...
The estimation of gluconeogenesis by using tracers is difficult and subject to a multitude of errors (14).
Gluconeogenesis is less active in BHE/CDB rats fed menhanden oil than in rats fed beef tallow.
Lipolysis and gluconeogenesis from glycerol are increased in patients with noninsulin-dependent diabetes mellitus.
jap.physiology.org /cgi/content/full/86/4/1374   (3939 words)

  
 Contributions of Gluconeogenesis to Glucose Production in the Fasted State -- Landau et al. 98 (2): 378 -- Journal of ...
that in gluconeogenesis ~ 80% of the hydrogen at carbon 2 equilibrates
The proportions of gluconeogenesis calculated from the ratios at carbon 6 to carbon 2 at 42 h were 33±3% at 14 h, 47±3% at
Gerich (1992) Increased lipolysis and its consequences on gluconeogenesis in non-insulin-dependent diabetes mellitus.
www.jci.org /cgi/content/full/98/2/378   (5758 words)

  
 TNF{{alpha}} Decreases Gluconeogenesis in Hepatocytes Isolated from 10-Day-Old Rats -- GOTO et al. 49 (4): 552 -- ...   (Site not responding. Last check: 2007-10-08)
Gluconeogenesis in hepatocytes isolated from 10-d-old rats was
was correlated with the decrease of the gluconeogenesis (r = 0.972).
Pilkis SJ, Granner DK 1992 Molecular physiology of the regulation of hepatic gluconeogenesis and glycolysis.
www.pedresearch.org /cgi/content/full/49/4/552   (3205 words)

  
 Glycogenesis
Gluconeogenesis is similar but not the exact reverse of glycolysis, some of the steps are the identical in reverse direction and three of them are new ones.
Gluconeogenesis occurs mainly in the liver with a small amount also occurring in the cortex of the kidney.
Therefore, gluconeogenesis is constantly occurring in the liver to maintain the glucose level in the blood to meet these demands.
www.elmhurst.edu /~chm/vchembook/604glycogenesis.html   (620 words)

  
 Modulation of Epinephrine-Stimulated Gluconeogenesis by Insulin in Hepatocytes Isolated from Genetically Obese (fa/fa) ...
The stimulation of gluconeogenesis by epinephrine was accompanied
to insulin of basal gluconeogenesis from lactate, and of F-2,6-P
Gluconeogenesis was assayed in aliquots of the cell suspensions taken after 20 min of incubation.
endo.endojournals.org /cgi/content/full/138/6/2443   (3727 words)

  
 Gluconeogenesis
Gluconeogenesis occurs to a more limited extent in the kidney and small intestine under some conditions.
When Gluconeogenesis is active in liver, oxaloacetate is diverted to form glucose (via PEP).
Gluconeogenesis expends 6 ~P bonds of ATP and GTP.
www.rpi.edu /dept/bcbp/molbiochem/MBWeb/mb1/part2/gluconeo.htm   (1209 words)

  
 Gluconeogenesis: The Body Makes It Own Carbs   (Site not responding. Last check: 2007-10-08)
Gluconeogenesis (Pronounced GLUE-CO-NAY-OH-GEN-EH-SIS), also known as GNG (that's easier to say anyway, isn't it?), is the body's way of creating glucose, or sugar carbs, out of the breakdown of proteins in the liver.
During gluconeogenesis, blood glucose levels in the body are normalized and maintained when the glucose is synthesized in the liver.
Once you grasp the concept of gluconeogenesis, you are light years ahead of most people in understanding better about the low-carb lifestyle and what makes it so special in the realm of diet, health and nutrition.
www.commonvoice.com /article.asp?colid=4291   (764 words)

  
 Increased pyruvate flux capacities account for diet-induced increases in gluconeogenesis in vitro -- Bizeau et al. 281 ...
gluconeogenesis (GNEO) in the absence and presence of fatty acids.
in vivo (23, 26) and the capacity for gluconeogenesis in vitro
The effect of treatment of the rat with bacterial endotoxin on gluconeogenesis and pyruvate metabolism in subsequently isolated hepatocytes.
ajpregu.physiology.org /cgi/content/full/281/2/R427   (3464 words)

  
 Glucose Turnover and Gluconeogenesis in Human Pregnancy -- Kalhan et al. 100 (7): 1775 -- Journal of Clinical ...
The rate of glucose appearance was calculated from the dilution of uniformly labeled glucose in plasma, as described (6).
Chandramouli, W.C. Schumann, and B.R. Landau (1995) A micromethod for the measurement of deuterium bound to carbon 6 of glucose to quantify gluconeogenesis in vivo.
Nurjhan, J.J. Reilly Jr., D.M. Bier, and J.F. Gerich (1990) Mechanism of increased gluconeogenesis in noninsulin-dependent diabetes mellitus.
www.jci.org /cgi/content/full/100/7/1775   (4562 words)

  
 Jose Aleman Research
Obesity accounts for increased morbidity in the industrial world and it is estimated that 31% of US adults fall into this category according to their Body Mass Index.
At the heart of these conditions is glucose homeostasis, which balances carbohydrate energy requirements through gluconeogenesis in the fasted response.
We wish to couple the genetic mechanisms of action of these factors to a physiologic picture of gluconeogenesis metabolism through the use of bioinformatic and metabolomic tools.
web.mit.edu /bamel/JoseRes.shtml   (145 words)

  
 Conference 5: Oxidative phosphorylation gluconeogenesis, glycogen metabolism
Since the conversion of glucose to lactate was normal, it must be one of the 4 reactions peculiar to gluconeogenesis that is defective.
One explanation proposed for this phenomenon was a defect in gluconeogenesis.
Hint: adrenaline release is a "call-to-action." In liver, activation of protein kinase A results in a slowing of glycolysis and activation of gluconeogenesis by removal of fructose-2,6-bisphosphate.
www.usd.edu /med/som/somdept/biochem/courses/bioc520/b520c5.htm   (1283 words)

  
 Gluconeogenesis and the Maintenance of Blood Glucose During Fasting
There are four enzymes unique to gluconeogenesis that catalyze reactions that circumvent the irreversible reactions of glycolysis.
Explain the control of the conversion of pyruvate to phosphoenolpyruvate during gluconeogenesis.
As blood glucose decreases and the insulin to glucagon ratio drops, the cyclic AMP cascade causes a change in the activities of the enzymes concerned with gluconeogenesis and glycolysis so that glucose is released into the blood.
faculty.une.edu /com/courses/bionut/distbio/obj-512/Chap31.htm   (1042 words)

  
 Gluconeogenesis
Transamination of OAA (2) to aspartate allows the aspartate to be transported to the cytosol where the reverse transamination occurs yielding cytosolic OAA.
The NADH produced during the cytosolic oxidation of malate to OAA is utilized during the glyceraldehyde-3-phosphate dehydrogenase reaction of gluconeogenesis.
The utilization of malate to transport OAA to the cytosol is a function of the
www.med.unibs.it /~marchesi/gluconeo.html   (2085 words)

  
 You are What You Eat | Animal Biology
Gluconeogenesis is the process of making glucose from simple substances.
So, you may think that gluconeogenesis is simply the reverse of glycolysis.
While most of the intermediates in the process are the same, the enzymes that move the reaction along are different in glycolysis and gluconeogenesis.
www.eng.auburn.edu /users/wfgale/usda_course/section0_3_page_2.htm   (405 words)

  
 Biochemistry - Study Questions on Gluconeogenesis & The Glyoxylate Cycle   (Site not responding. Last check: 2007-10-08)
Indicate the reactions needed for formation of phosphoenolpyruvate (PEP) from lactate for gluconeogenesis.
Why is it important to gluconeogenesis from blood lactate that liver LDH is in the cytosol rather than the mitochondrion?
Indicate the factors that prevent high levels of "futile cycling" of fructose-6-phosphate during gluconeogenesis in mammalian liver.
www.umsl.edu /~starling/biochem/study/sq-23.htm   (550 words)

  
 6 Gluconeogenesis
The pathway of glucose synthesis is called gluconeogenesis.
Gluconeogenesis is essentially confined to two organs: The liver and the kidney.
Both organs have an ample supply of amino acids: The liver from the intestine via the portal vein, the kidneys because they extract amino acids from the considerable volume (~150 l/day) of plasma ultrafiltrate that represents the first stage of urine secretion (cf.
watcut.uwaterloo.ca /webnotes/Metabolism/page-6.html   (316 words)

  
 GLYCOLYSIS, GLUCONEOGENESIS AND THE PENTOSE PATHWAY
The reverse reaction pathway, called gluconeogenesis, is responsible for producing glucose when glucose levels are low.
In the third bypass reaction of gluconeogenesis, glucose 6-phosphate is hydrolyzed to glucose.
Carbon input for glycolysis and gluconeogenesis is not only as glucose from the blood, but from numerous other sources as well.
www.biochem.arizona.edu /classes/bioc462/462b/glycolysis.html   (2812 words)

  
 The Transcription Factor CCAAT/Enhancer-binding Protein beta  Regulates Gluconeogenesis and Phosphoenolpyruvate ...   (Site not responding. Last check: 2007-10-08)
Measurement of Gluconeogenesis Rate-- The rate of gluconeogenesis was estimated in vivo in mice deprived of food 4 h (noon) prior to receiving intraperitoneal injection
Gluconeogenesis and PEPCK Gene Expression Are Lower in c/ebp
The contribution of in vivo gluconeogenesis to hyperglycemia was estimated by administering
www.jbc.org /cgi/content/full/274/19/13033   (5625 words)

  
 References - gluconeogenesis - HORT640 - Metabolic Plant Physiology - Department of Horticulture and Landscape ...
Reversibility of isocitrate dehydrogenase and involvement of ATP-citrate lyase in gluconeogenesis.
Di Donato L, Des Rosiers C, Montgomery JA, David F, Garneau M, Brunengraber H 1993 Rates of gluconeogenesis and citric acid cycle in perfused livers, assessed from the mass spectrometric assay of the 13C labeling pattern of glutamate.
Phue JN, Noronha SB, Hattacharyya R, Wolfe AJ, Shiloach J. 2005 Glucose metabolism at high density growth of E. coli B and E. coli K: differences in metabolic pathways are responsible for efficient glucose utilization in E. coli B as determined by microarrays and Northern blot analyses.
web.ics.purdue.edu /~drhodes/hort640c/referen/glucon.htm   (2464 words)

  
 Higher Insulin Concentrations Are Required to Suppress Gluconeogenesis Than Glycogenolysis in Nondiabetic Humans -- ...
of gluconeogenesis to EGP or UDP-glucose flux observed in the
Gluconeogenesis labels the fifth carbon of glucose with deuterium.
UDP-glucose flux or the contribution of gluconeogenesis to EGP.
diabetes.diabetesjournals.org /cgi/content/full/52/9/2213   (4867 words)

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