Starving Neurons Show Sex Difference in Autophagy
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Implication
In vitro study reveals greater starvation-induced autophagy and cell death in male neurons than female neurons, indicating sex- and tissue-dependent metabolic survival mechanisms.
Key Points
- To determine whether sex-dependent adaptations to starvation are intrinsically present within isolated neurons independent of peripheral nutrient depots.
- Cultured segregated male and female neurons and fibroblasts under conditions of nutrient deprivation.
- Inhibited autophagy using 3-methyladenine or small interfering RNA (siRNA) targeting Atg7, and supplemented cells with L-carnitine to support mitochondrial fatty acid transport.
- Assessed mitochondrial respiration, autophagosome formation, cell death, triglyceride levels, free fatty acids, and cytosolic phospholipase A2-dependent lipid droplets.
- Nutrient deprivation caused a more pronounced decline in mitochondrial respiration, higher autophagosome formation, and significantly greater cell death in male neurons compared to female neurons.
- Starvation-induced death in male neurons was attenuated by 3-methyladenine, Atg7 knockdown, or L-carnitine, whereas female neurons maintained relative tolerance through enhanced triglyceride accumulation and lipid droplet formation.
- Atg7 knockdown protected starving neurons from death but accelerated cell death in starving fibroblasts, confirming that the function of autophagy during starvation depends on both sex and tissue type.
Cite This Study
Du et al. (2008) studied this question.