A ketogenic diet differentially affects neuron and astrocyte transcription

Area of Science:

• Neuroscience
• Metabolic research
• Molecular biology

Background:

• Ketogenic diets (KDs) are known to alter brain metabolism, but their specific effects on neuronal and astrocyte transcription are not fully understood.
• Brain region-specific responses and varied mechanisms may contribute to the diverse effects of KDs.

Purpose of the Study:

• To investigate the differential impact of a ketogenic diet on the transcriptional profiles of brain neurons and astrocytes.
• To identify specific molecular pathways affected by KDs in the brain and explore their potential relevance to neurodegenerative diseases, particularly Alzheimer's disease (AD).

Main Methods:

• Male C57Bl6/N mice were fed either a 3-month ketogenic diet (KD) or a standard chow diet.
• Enriched neuron and astrocyte fractions were isolated from mouse brains.
• RNA-sequencing (RNA-Seq) was employed to analyze transcriptional changes in response to the KD.

Main Results:

• Neurons from KD-treated mice exhibited general transcriptional pathway activation.
• Astrocytes from KD-treated mice displayed a mixed pattern of transcriptional pathway suppression and activation.
• KDs significantly impacted pathways related to mitochondrial function, endoplasmic reticulum function, insulin signaling, and inflammation.
• Unbiased analysis revealed KD-induced transcriptional changes strongly implicated pathways altered in Alzheimer's disease (AD).

Conclusions:

• Ketogenic diets exert differential transcriptional effects on brain neurons and astrocytes.
• KD-induced brain changes are potentially relevant to neurodegenerative conditions such as Alzheimer's disease.
• This study provides unbiased evidence linking KD-driven molecular alterations to pathways implicated in AD pathogenesis.