Do Autophagy Enhancers/ROS Scavengers Alleviate Consequences of Mild Mitochondrial Dysfunction Induced in...

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Mitochondrial dysfunction, increased reactive oxygen species (ROS), and impaired autophagy are linked to neurodegenerative and psychiatric diseases.
• Mild mitochondrial dysfunction, relevant to bipolar disorder (BPD), was previously modeled in SH-SY5Y cells using rotenone.
• Rotenone exposure altered mitochondrial respiration, showing different effects at 72 and 96 hours.

Purpose of the Study:

• To investigate if autophagy enhancers and/or ROS scavengers can ameliorate rotenone-induced mild mitochondrial dysfunction in neuronal cells.
• To assess the efficacy of lithium, trehalose, rapamycin, resveratrol, N-acetylcysteine (NAC), and Mn-Tbap.
• To understand the mechanisms underlying the potential protective effects.

Main Methods:

• Human neuronal cells (SH-SY5Y) were exposed to rotenone to model mild mitochondrial dysfunction.
• Autophagy enhancers (lithium, trehalose, rapamycin, resveratrol) and ROS scavengers (resveratrol, NAC, Mn-Tbap) were administered.
• Mitochondrial respiration, measured as oxygen consumption rate (OCR), was analyzed.

Main Results:

• Lithium, when added late in the rotenone exposure, counteracted most rotenone-induced changes in OCR parameters.
• Rapamycin, resveratrol, NAC, and Mn-Tbap partially reversed rotenone's OCR effects after 72 hours.
• These effects were not always directly attributable to ROS scavenging or autophagy enhancement, suggesting diverse mechanisms.

Conclusions:

• Lithium demonstrated a significant ability to reverse rotenone-induced mitochondrial changes, potentially via autophagy modulation.
• Some autophagy enhancers and ROS scavengers can alleviate specific rotenone-induced mitochondrial alterations in neuronal cells.
• The findings suggest potential therapeutic avenues for conditions involving mitochondrial dysfunction, though mechanisms require further investigation.