Cited by 101Autism Spectrum Disorder ResearchHeavy Metal Exposure and ToxicityTrace Elements in Health

A key role for an impaired detoxification mechanism in the etiology and severity of Autism Spectrum Disorders

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Alabdali, Altaf, Al-Ayadhi, Laila, El-Ansary, Afaf·2014·Behavioral and Brain Functions

Abstract

BACKGROUND: Autism Spectrum Disorders (ASD) is a syndrome with a number of etiologies and different mechanisms that lead to abnormal development. The identification of autism biomarkers in patients with different degrees of clinical presentation (i.e., mild, moderate and severe) will give greater insight into the pathogenesis of this disease and will enable effective early diagnostic strategies and treatments for this disorder. METHODS: In this study, the concentration of two toxic heavy metals, lead (Pb) and mercury (Hg), were measured in red blood cells, while glutathione-s-transferase (GST) and vitamin E, as enzymatic and non-enzymatic antioxidants, respectively, were measured in the plasma of subgroups of autistic patients with different Social Responsiveness Scale (SRS) and Childhood Autism Rating Scale (CARS) scores. The results were compared to age- and gender-matched healthy controls. RESULTS: The obtained data showed that the patients with autism spectrum disorder had significantly higher Pb and Hg levels and lower GST activity and vitamin E concentrations compared with the controls. The levels of heavy metals (Hg and Pb), GST and vitamin E were correlated with the severity of the social and cognitive impairment measures (SRS and CARS). Receiver Operating Characteristics (ROC) analysis and predictiveness curves indicated that the four parameters show satisfactory sensitivity, very high specificity and excellent predictiveness. Multiple regression analyses confirmed that higher levels of Hg and Pb, together with lower levels of GST and vitamin E, can be used to predict social and cognitive impairment in patients with autism spectrum disorders. CONCLUSION: This study confirms earlier studies that implicate toxic metal accumulation as a consequence of impaired detoxification in autism and provides insight into the etiological mechanism of autism.

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  • Exposure to heavy metals and impaired detoxification system have been involved in the aetiology of ASD in a subset of individuals.

    “Exposure to heavy metals and impaired detoxification system, another abnormality in a subset of individuals with ASD, have also been involved in the aeitiology of ASD [157].”

    From Vitamin D and Autism Spectrum Disorder: A Literature Review (2016) · cites this paper as [157]

  • Alabdali et al. (2014) reported autistic children having lower levels of glutathione-transferase and vitamin E in plasma than healthy controls.

    “Alabdali et al. (2014) reported autistic children having higher levels of mercury and lead than healthy controls, and lower levels of glutathione-transferase and vitamin E in plasma [157].”

    From Vitamin D and Autism Spectrum Disorder: A Literature Review (2016) · cites this paper as [157]

  • Alabdali et al. (2014) reported autistic children having higher levels of mercury and lead than healthy controls.

    “Alabdali et al. (2014) reported autistic children having higher levels of mercury and lead than healthy controls, and lower levels of glutathione-transferase and vitamin E in plasma [157].”

    From Vitamin D and Autism Spectrum Disorder: A Literature Review (2016) · cites this paper as [157]

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Research works printed but not linked: 2

  1. American Psychiatric Association Diagnostic and Statistical Manual of Mental Disorders (fourth, text revision ed.) 2000 Washington, DC: American Psychiatric Association
  2. Al-Gadani Y Al-Ansary A Al-Attas O Al-Ayadhi L Oxidative stress andantioxidant status in Saudi autistic children Clin Biochem 2009 10 1032 1040 19306862

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Authors
Alabdali, A., Al-Ayadhi, L., & El-Ansary, A.
Affiliations
King Saud University (SA)
Corresponding author
El-Ansary, Afaf
Venue
Behavioral and Brain Functions
Published
2014-04-28
Volume
10
Issue
1
Pages
14-14
ISSN
1744-9081 (ISSN-L)
OpenAlex
W2167410889
Cited by
101
References
48
Citations by year
2026: 3 · 2025: 6 · 2024: 10 · 2023: 9 · 2022: 8 · 2021: 10 · 2020: 8 · 2019: 9 · 2018: 10 · 2017: 10 · 2016: 9 · 2015: 5 · 2014: 3 · 2013: 1
FWCI
5.02
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Behavioral and Brain Functions (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
King Saud University
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Heavy Metal Exposure and Toxicity
  • Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
Keywords
autism spectrum disorder, autism severity, heavy metal toxicity, lead, mercury, glutathione S-transferase, vitamin E, antioxidant status, autism biomarkers, social dysfunction, cognitive impairment, plasma mercury
MeSH terms
Child, Child Development Disorders, Pervasive, Child, Preschool, Cross-Sectional Studies, Female, Glutathione Transferase, Humans, Lead, Male, Mercury, Severity of Illness Index, Vitamin E, Biomarkers

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