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Updated: Jun 27, 2026

Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders
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[Neurotransmission in developmental disorders].

Yoshihiro Takeuchi1

  • 1Department of Pediatrics, Shiga University of Medical Science, Otsu, Shiga. takeuchi@belle.shiga-med.ac.jp

No to Hattatsu = Brain and Development
|December 2, 2008
PubMed
Summary

Neurotransmitter systems, particularly serotonin, play a crucial role in the development and pathophysiology of Attention Deficit/Hyperactivity Disorder (ADHD) and Autism Spectrum Disorders (ASD). Understanding these neuronal pathways is key for effective child neurology treatments.

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Area of Science:

  • Neuroscience
  • Child Neurology
  • Developmental Disorders

Background:

  • Attention Deficit/Hyperactivity Disorder (ADHD) is a complex developmental disorder with unclear etiology, often linked to catecholaminergic neurotransmission, especially dopamine.
  • Dopamine neurotransmission in the frontal cortex differs from subcortical regions due to low dopamine transporters (DAT), involving volume transmission and regulation by noradrenergic and serotonergic neurons.
  • Autism Spectrum Disorders (ASD) etiology is also unclear, with evidence pointing to abnormal circuitry and impairments in neurotransmission, particularly involving serotonin and glutamate.

Purpose of the Study:

  • To explore the neurobiological underpinnings of ADHD and ASD, focusing on the role of neurotransmitter systems.
  • To highlight the significance of serotonin system involvement in the pathophysiology of both ADHD and ASD.
  • To emphasize the importance of basic neuroscience and neuronal considerations in the medical examination and treatment of child neurological disorders.

Main Methods:

  • Review of accumulating neurobiological evidence, including genetics, neuropathology, and brain imaging studies.
  • Analysis of neurotransmitter functions, focusing on dopamine, norepinephrine, and serotonin pathways.
  • Examination of proposed pathophysiological aspects of ASD, such as cell migration, network balance, and synapse formation.

Main Results:

  • Accumulating evidence suggests a significant role for the serotonin system in ADHD.
  • Serotonin is implicated in key pathophysiological aspects of ASD, including cell migration, excitatory-inhibitory network balance, and synapse formation (involving reelin, neurexin, and neuroligin).
  • Noradrenergic and serotonergic neurons critically regulate dopaminergic function in the frontal cortex.

Conclusions:

  • The serotonin system is a crucial factor in the pathophysiology of both ADHD and ASD.
  • Understanding the intricate roles of neurons and neurotransmission is fundamental for advancing diagnosis and treatment in child neurology.
  • Future research should continue to integrate basic neuroscience findings into clinical practice for developmental disorders.