Mental Health, Neurotransmitters, and Neurodegenerative Disorders: Overlapping Mechanisms and Prevention

This podcast episode, hosted by Dr. Dawn Elise Snipes, delves into the intricate relationship between mental health, key neurotransmitters like serotonin and dopamine, and neurodegenerative disorders (NDs). It defines NDs as conditions where nerve cells in the brain or peripheral nervous system progressively lose function and die, listing common examples such as Alzheimer's, Parkinson's, ALS, and Huntington's disease. A central argument is the bi-directional interaction between mood disorders (depression, anxiety) and NDs, highlighting that individuals with pre-existing mental health issues are at higher risk for NDs, and vice versa, due to shared underlying physiological pathologies.

The presentation emphasizes that mental illnesses and NDs share overlapping neurodegenerative mechanisms, including oxidative stress, inflammation, and mitochondrial dysfunction. Oxidative stress, resulting from the body's inability to clear free radicals during chronic HPA axis activation, is identified as a significant contributor. The episode meticulously reviews the diverse functions of serotonin (mood, cognition, sleep, immunity, pain, hormones) and dopamine (motivation, attention, energy, muscle control, blood flow, glucose metabolism), illustrating how imbalances in these neurotransmitters can manifest as symptoms common to both mood disorders and NDs, such as cognitive decline, sleep disturbances, and altered mood.

Practical insights include the importance of a holistic diagnostic approach, urging clinicians not to solely attribute symptoms to one neurotransmitter or disorder. For instance, depression should prompt consideration of potential underlying neurodegenerative processes, and NDs should not exclude serotonin imbalances. The discussion also covers pharmacological interventions like SSRIs, SNRIs, and SARIs (Trazodone), noting their impact on ND progression and sleep, while cautioning about potential side effects like REM sleep inhibition. The complexity of serotonin receptors is highlighted, underscoring that simply increasing serotonin isn't always the answer.

Broader implications extend to preventative strategies and comprehensive assessment. The podcast stresses the value of early screening for NDs in patients presenting with significant depression, especially if accompanied by cognitive changes. It also connects ND risk to lifestyle factors like sleep apnea (due to inadequate oxygenation and HPA axis activation) and substance abuse (e.g., amphetamine-induced neurotoxicity, alcohol detox complications). The importance of routine blood work to check gonadal hormones, thyroid function, and liver health is underscored, as imbalances in these areas can significantly impact mood and cognition, potentially mimicking or exacerbating ND symptoms.

neurodegenerative diseases occur when nerve cells in the brain or the peripheral nervous system lose function over time and ultimately die

mental illnesses and nds... have overlapping neurodegenerative mechanisms

oxidative stress is what happens when your body is not able to clear out the free radicals quickly enough because you're making too many

inflammation is associated with both nds as well as mood disorders

serotonin is involved in just about everything that we do

lower serotonin levels contribute to cognitive decline

treatment with ssris selective serotonin reuptake inhibitors or snri selective norepinephrine reuptake inhibitors significantly slows the progression of cognitive impairment in neurodegenerative disorders

Parkinson's disease is a neurodegenerative disease characterized by loss of dopaminergic neurons in fact 60 to 80 percent or more of dopamine-producing cells are gone by the time the person presents with actual symptoms

excessive dopamine can also create a neurotoxic environment which leads to dysregulation of the dopaminergic system

when we're working with people who present with depressive depression clinical depression a lot of times we don't even think neurodegenerative a lot of times we don't even think dopamine we instantly think serotonin and when people present with nds we automatically think dopamine and don't think serotonin but in actuality either way it could be either neurotransmitter

if you give people a five point likert scale a lot of times they'll choose three and so you're not getting as good of a picture so either use really good definable anchors or and or keep it to four points of of reference

sleep apnea is associated with some neurodegenerative disorders