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Updated: Mar 23, 2026

Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model
Published on: October 6, 2023
Developmental neurotoxicity of monocrotophos and lead is linked to thyroid disruption
B Kala Kumar1, A Gopala Reddy1, A Vamsi Krishna2
1Department of Veterinary Pharmacology & Toxicology, College of Veterinary Science, Sri P.V. Narsimha Rao Telangana State University for Veterinary, Animal and Fishery Science, Hyderabad - 500 030, Telangana, India.
Aim:
A role of thyroid disruption in developmental neurotoxicity of monocrotophos (MCP) and lead is studied.
Materials And Methods:
A total of 24 female rats after conception were randomized into four groups of six each and treated as follows: Group I - Sham was administered distilled water orally. Group II - A positive control was administered methyl methimazole at 0.02% orally in drinking water. Group III - MCP orally at 0.3 mg/kg and Group IV - Lead acetate at 0.2% orally in drinking water. The drug was administered from gestation day 3 through post-natal day 21 in all the groups. Acetylcholinesterase (AChE) inhibition, thyroid profile (thyroid stimulating hormone, T3 and T4), neurodevelopment (brain wet weights, DNA, RNA and protein), and neurobehavioral (elevated plus maze, photoactometry, and Morris water maze) parameters were assessed in pups. A histopathology of thyroid of dams and brain of progeny was conducted.
Results:
Inhibition of AChE was <20%. Thyroid profile decreased in the treatment groups. Neurodevelopmental and neurobehavioral parameters did not reveal any significant changes. Thyroid architecture was affected significantly with MCP and lead. Cortical layers too were affected. The three layers of cerebellum either had abnormal arrangement or decreased cellularity in all treated groups relating to thyroid disruption.
Conclusion:
MCP and lead might have affected the development of cerebrum and cerebellum via thyroid disruption leading to developmental neurotoxicity.
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