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Under these circumstances, acetyl-CoA is diverted to the formation of acetoacetate and beta-hydroxybutyrate. [2] Acetoacetate, beta-hydroxybutyrate, and their spontaneous breakdown product, acetone, [9] are known as ketone bodies. The ketone bodies are released by the liver into the blood.
Most acetoacetate is reduced to beta-hydroxybutyrate, which serves to additionally ferry reducing electrons to the tissues, especially the brain, where they are stripped back off and used for metabolism. Acetone, which is generated through the decarboxylation of acetoacetate, either spontaneously or through the enzyme acetoacetate decarboxylase.
In fact, β-Hydroxybutyrate is the most abundant ketone-like molecule in the blood during ketosis. [5] Acetone. Acetone is an organic compound with the formula (CH3)2CO and is one of the simplest and smallest ketones. It is synthesized from the breakdown of acetoacetate in ketotic individuals within the liver. [3]
Alternatively, acetoacetate can spontaneously degrade to a third ketone body (acetone) and carbon dioxide, which generates much greater concentrations of acetoacetate and D-β-hydroxybutyrate. The resulting ketone bodies cannot be used for energy by the liver so are exported from the liver to supply energy to the brain and peripheral tissues.
Acetoacetate is an intermediate in the Krebs cycle which releases energy from sugars and carbohydrates. [ 22 ] In medicine, acetone , acetoacetate, and beta-hydroxybutyrate are collectively called ketone bodies , generated from carbohydrates , fatty acids , and amino acids in most vertebrates , including humans.
Two acetyl-CoA molecules condense to form acetoacetyl-CoA, which gives rise to the formation of acetoacetate and β-hydroxybutyrate. [16] Acetoacetate, β-hydroxybutyrate, and their spontaneous breakdown product acetone [ 18 ] are frequently, but confusingly, known as ketone bodies (as they are not "bodies" at all, but water-soluble chemical ...
Under these conditions, acetyl-CoA is diverted to the formation of acetoacetate and beta-hydroxybutyrate. [10] Acetoacetate, beta-hydroxybutyrate, and their spontaneous breakdown product, acetone, are frequently, but confusingly, known as ketone bodies (as they are not "bodies" at all, but water-soluble chemical substances). The ketones are ...
It is sensitive to acetoacetate only, and the ratio of beta-hydroxybutyric to acetoacetate is shifted from a normal value of around 1:1 up to around 10:1 under severely ketoacetotic conditions, due to a changing redox milieu in the liver. Measuring acetoacetate alone will thus underestimate the accompanying beta-hydroxybutyrate if the standard ...
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