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Pathway Description
Gluconeogenesis
Homo sapiens
Metabolic Pathway
Created: 2013-08-19
Last Updated: 2023-10-12
Gluconeogenesis, which is essentially the reverse of glycolysis, results in the sythesis of glucose from non-carbohydrate substrates such as lactate, glycerol, and glucogenic amino acids. In animals, gluconeogenesis occurs primarily in the liver, and in the renal cortex to a lesser extent. This process occurs during periods of fasting or intense exercise. Gluconeogenesis is often associated with ketosis. Several non-carbohydrate carbon substrates can enter the gluconeogenesis pathway. One common substrate is lactic acid, formed during anaerobic respiration in skeletal muscle. Lactate may also come from red blood cells, which obtain energy solely from glycolysis as they have no membrane-bound organelles for aerobic respiration. Lactate is transported to the liver to be converted into pyruvate in the Cori cycle by lactate dehydrogenase. Pyruvate can then be used to generate glucose via gluconeogenesis. Many other compounds can also function as substrates for gluconeogenesis such as citric acid cycle intermediates (through conversion to oxaloacetate), amino acids other than lysine or leucine, and glycerol .
References
Gluconeogenesis References
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Pubmed: 12754525
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Pubmed: 15489334
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