Mitochondrial Dysfunction in the Inflammatory Process of Neurodegenerative Diseases

Area of Science:

• Mitochondrial biology
• Neuroimmunology
• Biochemistry

Background:

• Neurodegenerative diseases share a common mitochondrial-immune axis.
• Impaired oxidative phosphorylation in neurons alters metabolism and promotes chronic inflammation.
• Complex I dysfunction is central, affecting the coenzyme Q (CoQ) pool and reactive oxygen species (ROS) production.

Purpose of the Study:

• To highlight the role of respiratory supercomplex plasticity in modulating electron transport chain function and ROS generation.
• To explore the mechanisms linking mitochondrial damage to neuroinflammation via ROS and damage-associated molecular patterns.
• To integrate findings across Parkinson's, Alzheimer's, ALS, and Huntington's disease models.

Main Methods:

• Analysis of mitochondrial-immune axis in neurodegenerative diseases.
• Investigation of Complex I function and its impact on CoQ pool and ROS.
• Examination of respiratory supercomplex plasticity (CI-CIII2, CIII2-CIVn, CI-CIII2-CIVn).
• Integration of evidence from disease models and therapeutic strategies.

Main Results:

• Complex I defects lead to CoQ over-reduction, increased ROS, and mitochondrial damage.
• Excess ROS triggers inflammatory pathways including NLRP3 inflammasome, cGAS-STING, and TLR9.
• These pathways create feed-forward loops exacerbating mitochondrial injury and neuroinflammation.
• Supercomplex plasticity influences carrier channeling, flux control, and ROS propensity.

Conclusions:

• The mitochondrial-immune axis is a key feature of neurodegenerative diseases.
• Dysfunctional Complex I and subsequent ROS production are critical drivers of neuroinflammation.
• Therapeutic strategies targeting electron transport chain support, supercomplex stabilization, and mtDNA-sensing pathways show promise.