Brain Mitochondrial Dysfunction: A Possible Mechanism Links Early Life Anxiety to Alzheimer's Disease in Later Life

Alzheimer's disease (AD) is usually manifested in patients with dementia, accompanied by anxiety and other mental symptoms. Emerging evidence from humans indicates that people who suffer from anxiety in their early life are more likely to develop AD in later life. Mitochondria, the prominent organelles of energy production in the brain, have crucial physiological significance for the brain, requiring considerable energy to maintain its normal physiological activities. Net reactive oxygen species (ROS) was produced by mitochondrial impairment, in which oxidative stress is also included, and the production of ROS is mostly more than that of removal. In this paper, we propose that as a critical process in brain pathology, mitochondrial dysfunction caused by anxiety triggering oxidative stress might be a possible mechanism that links early life anxiety to AD in later life. Several pivotal physiological roles of mitochondria are reviewed, including functions regulating glucose homeostasis, which may disrupt in oxidative stress. Increased levels of oxidative stress are constantly shown in anxiety disorder patients, and antioxidant drugs have promise in treating anxiety. In the early stages of AD, mitochondrial dysfunction is concentrated around senile plaques, a landmark lesion composed of aggregated A ss and Tau protein. In turn, the accumulated A ss and Tau disrupts mitochondrial activity, and the tricky physiological processes of mitochondria might be significant to the course of AD. In the end, we conclude that mitochondria might present as one of the novel therapeutic targets to block oxidative stress in patients with anxiety disorders to prevent AD in the early stage.

Automated summary

Anxiety in early life is linked to an increased risk of Alzheimer's disease (AD) later in life. Mitochondria dysfunction caused by anxiety-triggered oxidative stress might be a possible mechanism that connects early life anxiety to AD. Mitochondria play crucial roles in maintaining brain function, and disruptions in glucose homeostasis can lead to oxidative stress. Targeting mitochondria to reduce oxidative stress may prevent or delay the onset of AD in individuals with anxiety disorders.