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Journal Article
Review
Kynurenic Acid and Neuroprotective Activity of the Ketogenic Diet in the Eye.
BACKGROUND: There is growing evidence of the involvement of the kynurenine metabolic pathway and the enhancement of kynurenic acid production in the neuroprotective effects of the ketogenic diet.
OBJECTIVE: Here, we review evidence implicating kynurenic acid in the efficacy of ketogenic diet in eye diseases associated with neurodegeneration.
FINDINGS: Ketogenic diet and ketone bodies that are elevated during exposure to the ketogenic diet each have a neuroprotective effect on retinal ganglion cells in a rat model of Nmethyl- D-aspartate induced neuronal damage. Chronic exposure to ketogenic diet also increases kynurenic acid concentrations in discrete rat brain structures. A non-selective glutamate receptor agonist, glutamate, also decreases the production of kynurenic acid in bovine retinal slices; this effect is attenuated by acetoacetate and β-hydroxybutyrate, two of three ketone bodies overproduced during ketogenic diet.
PERSPECTIVE: Whether ketogenic diet induced enhancement of kynurenic acid production would translate into a clinically significant improvement in certain eye diseases like glaucoma and retinal neurodegenerations awaits further experimental and clinical verification.
OBJECTIVE: Here, we review evidence implicating kynurenic acid in the efficacy of ketogenic diet in eye diseases associated with neurodegeneration.
FINDINGS: Ketogenic diet and ketone bodies that are elevated during exposure to the ketogenic diet each have a neuroprotective effect on retinal ganglion cells in a rat model of Nmethyl- D-aspartate induced neuronal damage. Chronic exposure to ketogenic diet also increases kynurenic acid concentrations in discrete rat brain structures. A non-selective glutamate receptor agonist, glutamate, also decreases the production of kynurenic acid in bovine retinal slices; this effect is attenuated by acetoacetate and β-hydroxybutyrate, two of three ketone bodies overproduced during ketogenic diet.
PERSPECTIVE: Whether ketogenic diet induced enhancement of kynurenic acid production would translate into a clinically significant improvement in certain eye diseases like glaucoma and retinal neurodegenerations awaits further experimental and clinical verification.
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