Ketogenic Diet Modulates NAD

Area of Science:

• Neuroscience
• Metabolic Science
• Molecular Biology

Background:

• The ketogenic diet (KD) shows promise for neurological disorders beyond epilepsy.
• A fundamental mechanism for KD's broad therapeutic effects is currently unknown.
• Previous research indicated KD increases hippocampal nicotinamide adenine dinucleotide+ (NAD+) in rats.

Purpose of the Study:

• To investigate the impact of KD on NAD+-dependent enzymes and DNA damage markers in the rat hippocampus.
• To explore the rapid and persistent effects of KD on cellular resilience pathways.

Main Methods:

• Rats were fed either regular chow or a KD for 2 days or 3 weeks.
• Quantification of hippocampal sirtuin enzyme activity, Sirt1 mRNA, poly-ADP ribose polymerase-1 (PARP-1), and 8-hydroxy-2'-deoxyguanosine (8-OHdG) levels.

Main Results:

• KD induced a rapid and sustained increase in nuclear sirtuin activity and Sirt1 mRNA levels.
• PARP-1 and 8-OHdG levels, a marker of oxidative DNA damage, significantly decreased after KD treatment.
• These changes occurred within 2 days and persisted for 3 weeks.

Conclusions:

• The ketogenic diet rapidly modulates brain energy metabolism via NAD+-dependent pathways.
• KD enhances cellular resilience against DNA damage through NAD+-related mechanisms.
• This study provides a mechanistic link between KD, NAD+ metabolism, and potential benefits for various neurological conditions and overall healthspan.