Autonomic Nervous System Disorders and Neurological Implications

The autonomic nervous system (ANS) orchestrates involuntary functions such as cardiovascular regulation, digestion, thermoregulation and genitourinary control through its sympathetic and parasympathetic divisions. Disruptions to this finely balanced network give rise to a spectrum of autonomic disorders, including orthostatic hypotension, pure autonomic failure, multiple system atrophy and autonomic synucleinopathies linked to Parkinson’s disease. These conditions not only manifest peripheral symptoms—diminished heart rate variability, urinary and sexual dysfunction, abnormal sweating—but also reflect and influence central neurodegenerative processes. Recent advances have elucidated molecular mechanisms ranging from catecholaminergic enzyme dysregulation to pathological alpha-synuclein deposition in peripheral nerves, underscoring the bidirectional dialogue between the peripheral autonomic fibres and the central nervous system. Improved understanding of this interplay has driven the development of novel biomarkers and imaging techniques, offering the promise of earlier diagnosis and targeted therapeutics. Given the global burden of neurodegenerative and cardiovascular comorbidities, integrated research into ANS disorders and their neurological implications is essential for translating mechanistic insights into clinical interventions.

Research from Nature Portfolio

Studies in non-human primate models of Parkinsonism have characterised cardiac autonomic adaptations following MPTP-induced neurotoxicity. Investigators observed a reduction in total tyrosine hydroxylase expression in both ventricles, accompanied by compensatory phosphorylation of the remaining enzyme. In parallel, there was a marked increase in membrane-bound catechol-O-methyltransferase, implicating enhanced noradrenaline metabolism in the dysautonomia of neurodegeneration. These findings highlight the resilience and plasticity of peripheral autonomic neurons under central insult, and they propose enzymatic modulation as a potential strategy for ameliorating cardiovascular symptoms in synucleinopathies.

Autonomic Nervous System Disorders and Neurological Implications publication trend

The graph below shows the total number of articles in autonomic nervous system disorders and neurological implications across all publications each year (not limited to Nature Index journals).

Technical terms

Autonomic Nervous System: The neural network that regulates involuntary physiological processes such as heart rate, blood pressure, digestion and thermoregulation.

Tyrosine Hydroxylase (TH): The enzyme responsible for the first step in catecholamine synthesis, converting tyrosine to L-DOPA.

Catechol-O-Methyltransferase (COMT): An enzyme that metabolises catecholamines, existing in membrane-bound and soluble isoforms that modulate neurotransmitter levels.

Induced Pluripotent Stem Cell (iPSC): A mature cell reprogrammed to an embryonic-like state, capable of differentiating into various cell types, including peripheral neurons.

Synucleinopathy: A class of neurodegenerative diseases characterised by abnormal aggregation of the protein alpha-synuclein within neurons and glia.

Nav1.3: A voltage-gated sodium channel subunit encoded by the SCN3A gene, implicated in neuronal excitability and explored as a biomarker in peripheral autonomic dysfunction.

References

1. Cardiac tyrosine hydroxylase activation and MB-COMT in dyskinetic monkeys. Scientific Reports (2021).
2. Chronic and acute exposure to rotenone reveals distinct Parkinson's disease-related phenotypes in human iPSC-derived peripheral neurons. Free Radical Biology and Medicine (2024).
3. Decreased urinary excretion of norepinephrine and dopamine in autonomic synucleinopathies. Clinical Autonomic Research (2024).
4. Pelvic autonomic dysfunction is common in patients with pure autonomic failure. European Journal of Neurology (2024).
5. Pathophysiological significance of increased α-synuclein deposition in sympathetic nerves in Parkinson’s disease: a post-mortem observational study. Translational Neurodegeneration (2022).