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Dynamic Clamp Methods to Investigate Impaired Neuronal Excitability Associated with Autism

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Published on: October 17, 2025

Sulfhydryl-reactive metals in autism.

Janet K Kern¹, Bruce D Grannemann, Madhukar H Trivedi

¹Department of Psychiatry, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390-9119, USA. janet.kern@UTSouthwestern.edu

Journal of Toxicology and Environmental Health. Part A

|March 17, 2007

Summary

Children with autism showed lower levels of arsenic, cadmium, and lead in hair samples compared to typical children. This suggests potential difficulties in excreting these toxic metals, possibly contributing to autism symptoms.

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Area of Science:

Environmental Health
Neurodevelopmental Disorders
Toxicology

Background:

Children with autism spectrum disorder (ASD) may exhibit impaired detoxification pathways.
Accumulation of unremetabolized heavy metals in the brain is a potential concern in ASD.
Previous research suggests differences in metal metabolism between children with and without autism.

Purpose of the Study:

To investigate the levels of specific sulfhydryl-reactive metals in children diagnosed with autism.
To compare metal concentrations in hair samples between children with autism and typically developing children.
To explore the relationship between metal excretion and potential contributions to autism symptoms.

Main Methods:

Hair samples were collected from 45 children with autism (ages 1-6) and 45 matched controls.
Inductively coupled mass spectrometry was used to quantify metal levels.
Statistical analysis compared metal concentrations between the two groups.

Main Results:

Arsenic, cadmium, and lead levels were significantly lower in the hair of children with autism compared to controls.
Mercury levels followed the same trend (lower in autism) but did not reach statistical significance.
These findings suggest reduced excretion of these metals in children with autism.

Conclusions:

The study supports the hypothesis that children with autism may have impaired ability to excrete toxic metals like arsenic, cadmium, and lead.
Lower hair metal concentrations may indicate increased retention and a higher body burden of these metals.
This metal accumulation could potentially play a role in the development or manifestation of autism spectrum disorder symptoms.