α-Ketoglutarate Is a Circulatory Exercise Factor That Promotes Learning and Memory Recall and Has Antidepressant...

Area of Science:

• Neuroscience
• Metabolomics
• Behavioral Science

Background:

• Depression presents a significant societal challenge, driving the search for effective treatments.
• Exercise is a promising non-pharmacological intervention for mental health, influencing brain-derived neurotrophic factor (BDNF).
• Exercise-induced changes in BDNF are modulated by circulating metabolites, termed exercise factors.

Purpose of the Study:

• To investigate the role of alpha-ketoglutarate (aKG) as an exercise factor.
• To evaluate the effects of aKG on memory and depression-like behaviors in a mouse model.

Main Methods:

• Mice were administered aKG or a glutaminase inhibitor, alongside an exercise paradigm.
• Depression-like behaviors were induced via chronic social defeat stress.
• Social interaction, open-field tests, and Western blots were used to assess behavior and BDNF signaling.

Main Results:

• Alpha-ketoglutarate (aKG) was identified as a metabolite released post-exercise in male mice.
• aKG administration replicated exercise's positive effects on spatial learning and memory.
• aKG demonstrated prophylactic and antidepressant properties in a chronic social defeat stress model.

Conclusions:

• aKG functions as both a prophylactic and antidepressant agent.
• aKG effectively mitigates social avoidance behaviors by regulating BDNF levels in key brain regions like the hippocampus and nucleus accumbens.