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Ketones Suppress Brain Glucose Consumption

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Part of the Advances in Experimental Medicine and Biology book series (AEMB,volume 645)

Abstract

The brain is dependent on glucose as a primary energy substrate, but is capable of utilizing ketones such as β-hydroxybutyrate (βHB) and acetoacetate (AcAc), as occurs with fasting, prolonged starvation or chronic feeding of a high fat/low carbohydrate diet (ketogenic diet). In this study, the local cerebral metabolic rate of glucose consumption (CMRglu; μM/min/100g) was calculated in the cortex and cerebellum of control and ketotic rats using Patlak analysis. Rats were imaged on a rodent PET scanner and MRI was performed on a 7-Tesla Bruker scanner for registration with the PET images. Plasma glucose and βHB concentrations were measured and 90-minute dynamic PET scans were started simultaneously with bolus injection of 2-Deoxy-2[18F]Fluoro-D-Glucose (FDG).The blood radioactivity concentration was automatically sampled from the tail vein for 3 min following injection and manual periodic blood samples were taken. The calculated local CMRGlu decreased with increasing plasma BHB concentration in the cerebellum (CMRGlu = -4.07*[BHB] + 61.4, r² = 0.3) and in the frontal cortex (CMRGlu = - 3.93*[BHB] + 42.7, r² = 0.5). These data indicate that, under conditions of ketosis, glucose consumption is decreased in the cortex and cerebellum by about 10% per each mM of plasma ketone bodies.

Keywords

  • Positron Emission Tomography
  • Cerebral Blood Flow
  • Positron Emission Tomography Image
  • Glucose Consumption
  • Ketone Body

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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LaManna, J.C. et al. (2009). Ketones Suppress Brain Glucose Consumption. In: Liss, P., Hansell, P., Bruley, D.F., Harrison, D.K. (eds) Oxygen Transport to Tissue XXX. Advances in Experimental Medicine and Biology, vol 645. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-85998-9_45

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