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Related Experiment Video

Updated: Jan 21, 2026

A Neurite Outgrowth Assay and Neurotoxicity Assessment with Human Neural Progenitor Cell-Derived Neurons

A Neurite Outgrowth Assay and Neurotoxicity Assessment with Human Neural Progenitor Cell-Derived Neurons

Published on: August 6, 2020

Arsenic Neurotoxicity in Humans.

Hitoshi Mochizuki¹

¹Division of Neurology, Respirology, Endocrinology and Metabolism; Department of Internal Medicine; Faculty of Medicine; University of Miyazaki, Miyazaki 889-1692, Japan. mochizuki-h@umin.net.

International Journal of Molecular Sciences

|July 25, 2019

Summary

Chronic arsenic (As) exposure causes unclear symptoms and long-term effects, primarily impacting peripheral nerves. Recognizing As toxicity requires a multidisciplinary approach due to nonspecific symptoms.

Keywords:

Toroku arsenic mechanism metabolite pathway neurotoxicity oxidative stress

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Area of Science:

Environmental Health
Toxicology
Neurology

Background:

Arsenic contamination is a global health issue affecting millions.
Clinical manifestations and long-term outcomes of chronic arsenic exposure remain poorly understood.

Purpose of the Study:

To review arsenic contamination and toxicity.
To provide clinical insights for managing arsenic-exposed patients.
To document arsenic metabolite pathways, toxicity mechanisms, and neurological symptoms.

Main Methods:

Literature review on arsenic contamination and toxicity.
Documentation of arsenic metabolite pathways and toxicity mechanisms.
Analysis of clinical neurological symptoms and sural nerve biopsy findings.

Main Results:

Arsenic-induced neurotoxicity involves oxidative stress, apoptosis, thiamine deficiency, and decreased acetylcholinesterase activity.
Neurotoxicity predominantly affects peripheral sensory nerve fibers, with axonal degeneration observed in small myelinated and unmyelinated fibers.
High arsenic concentrations cause severe central nervous system impairment in infants but minimal effects in adults, showing a dose-response relationship.

Conclusions:

Arsenic exposure leads to neurotoxicity, primarily affecting peripheral nerves.
Symptoms of arsenic toxicity are often nonspecific, necessitating a multifaceted diagnostic approach.
Effective management requires collaboration between clinicians and specialists from various fields.