NDLI: Substrate Competition Studies Demonstrate Oxidative Metabolism of Glucose, Glutamate, Glutamine, Lactate and 3-Hydroxybutyrate in Cortical Astrocytes from Rat Brain

Content Provider	Springer Nature Link
Author	McKenna, Mary C.
Copyright Year	2012
Abstract	It is well established that astrocytes can utilize many substrates to support oxidative energy metabolism; however, use of energy substrates in the presence of other substrates, as would occur in vivo, has not been systematically evaluated. Substrate competition studies were used to determine changes in the rates of $^{14}$CO$_{2}$ production since little is known about the interaction of energy substrates in astrocytes. The rates of $^{14}$CO$_{2}$ production from 1 mM D-[6-$^{14}$C]glucose, l-[U-$^{14}$C]glutamate, l-[U-$^{14}$C]glutamine, d-3-hydroxy[3-$^{14}$C]butyrate, l-[U-$^{14}$C]lactate and l-[U-$^{14}$C]malate by primary cultures of astrocytes from rat brain were determined to be 1.17 ± 0.19, 85.30 ± 12.25, 28.04 ± 2.84, 13.55 ± 4.56, 14.84 ± 2.40 and 5.20 ± 1.20 nmol/h/mg protein (mean ± SEM), respectively. The rate of $^{14}$CO$_{2}$ production from glutamate oxidation was higher than that of the other substrates Addition of unlabeled glutamate significantly decreased the rates of $^{14}$CO$_{2}$ production from all other substrates studied; however, glutamate oxidation was not altered by the addition of any of the other substrates. The rate of $^{14}$CO$_{2}$ production of glutamine was decreased by glutamate, but not altered by other substrates. The rate of $^{14}$CO$_{2}$ production from glucose was significantly decreased by the addition of unlabeled glutamate, glutamine or lactate, but not by 3-hydroxybutyrate or malate. Addition of unlabeled glucose did not significantly alter the $^{14}$CO$_{2}$ production from any other substrate. $^{14}$CO$_{2}$ production from lactate was decreased by the addition of unlabeled glutamine or glutamate and increased by addition of malate. The $^{14}$CO$_{2}$ production from malate was decreased by the addition of unlabeled glutamate or lactate, but was not altered by the other substrates. The substrate utilization for oxidative energy metabolism in astrocytes is very different than the profile previously reported for synaptic terminals. These studies demonstrate the potential use of multiple substrates including glucose, glutamate, glutamine, lactate and 3-hydroxybutyrate as energy substrates for astrocytes. The data also provide evidence of interactions of substrates and multiple compartments of TCA cycle activity in cultured astrocytes.
Starting Page	2613
Ending Page	2626
Page Count	14
File Format	PDF
ISSN	03643190
Journal	Neurochemical Research
Volume Number	37
Issue Number	11
e-ISSN	15736903
Language	English
Publisher	Springer US
Publisher Date	2012-10-19
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrocytes Energy metabolism Glucose Glutamate Lactate Glutamine 3-Hydroxybutyrate Malate Substrate competition Compartmentation Biochemistry Neurochemistry Neurosciences Neurology Cell Biology
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Cellular and Molecular Neuroscience

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