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Ketones prevent synaptic dysfunction induced by mitochondrial respiratory complex inhibitors.

Do Young Kim¹, Johana Vallejo, Jong M Rho

¹Barrow Neurological Institute and St. Joseph's Hospital & Medical Center, Phoenix, Arizona 85013, USA. doyoung.kim@chw.edu

Journal of Neurochemistry

|April 9, 2010

Summary

Ketones protect against synaptic impairment caused by mitochondrial dysfunction. This study shows ketones enhance ATP generation and act as antioxidants, preserving cognitive function in neurodegenerative models.

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Area of Science:

Neuroscience
Biochemistry
Cellular Biology

Background:

Ketones show promise in neurodegenerative disorder models, particularly for mitochondrial dysfunction and cognitive deficits.
Evidence for ketones' synaptic protective effects against mitochondrial dysfunction is limited.

Purpose of the Study:

To investigate the neuroprotective effects of ketones on synaptic impairment induced by mitochondrial respiratory complex (MRC) inhibitors.
To elucidate the mechanisms underlying ketone-mediated synaptic protection, including antioxidant actions and ATP generation.

Main Methods:

Electrophysiology was used to measure synaptic function (population spike and field potential amplitudes) in the CA1 hippocampus.
Reactive oxygen species (ROS) imaging and biochemical assays assessed cellular oxidative stress and ATP levels.
Mitochondrial respiratory complex inhibitors, rotenone (MRC I) and 3-nitropropionic acid (MRC II), were used to induce synaptic impairment.

Main Results:

MRC inhibitors dose-dependently impaired synaptic function.
Ketone pre-treatment strongly prevented population spike suppression and partially protected field potentials.
Ketones suppressed ROS generation induced by 3-nitropropionic acid and reversed ATP depletion caused by both inhibitors.

Conclusions:

Ketones preserve synaptic function in the hippocampus under conditions of mitochondrial dysfunction.
The protective mechanisms involve antioxidant activity and enhanced ATP production.
These findings highlight ketones as potential therapeutic agents for neurodegenerative diseases characterized by mitochondrial dysfunction.