Acta Neuropathologica

, Volume 124, Issue 1, pp 67–79

Decreased pyramidal neuron size in Brodmann areas 44 and 45 in patients with autism

  • Sarah Jacot-Descombes
  • Neha Uppal
  • Bridget Wicinski
  • Micaela Santos
  • James Schmeidler
  • Panteleimon Giannakopoulos
  • Helmut Heinsein
  • Christoph Schmitz
  • Patrick R. Hof
Original Paper

DOI: 10.1007/s00401-012-0976-6

Cite this article as:
Jacot-Descombes, S., Uppal, N., Wicinski, B. et al. Acta Neuropathol (2012) 124: 67. doi:10.1007/s00401-012-0976-6

Abstract

Autism is a neurodevelopmental disorder characterized by deficits in social interaction and social communication, as well as by the presence of repetitive and stereotyped behaviors and interests. Brodmann areas 44 and 45 in the inferior frontal cortex, which are involved in language processing, imitation function, and sociality processing networks, have been implicated in this complex disorder. Using a stereologic approach, this study aims to explore the presence of neuropathological differences in areas 44 and 45 in patients with autism compared to age- and hemisphere-matched controls. Based on previous evidence in the fusiform gyrus, we expected to find a decrease in the number and size of pyramidal neurons as well as an increase in volume of layers III, V, and VI in patients with autism. We observed significantly smaller pyramidal neurons in patients with autism compared to controls, although there was no difference in pyramidal neuron numbers or layer volumes. The reduced pyramidal neuron size suggests that a certain degree of dysfunction of areas 44 and 45 plays a role in the pathology of autism. Our results also support previous studies that have shown specific cellular neuropathology in autism with regionally specific reduction in neuron size, and provide further evidence for the possible involvement of the mirror neuron system, as well as impairment of neuronal networks relevant to communication and social behaviors, in this disorder.

Keywords

Autism Brodmann area 44 Brodmann area 45 Inferior frontal gyrus Neuropathology Stereology 

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Sarah Jacot-Descombes
    • 1
    • 4
  • Neha Uppal
    • 1
    • 3
  • Bridget Wicinski
    • 1
  • Micaela Santos
    • 1
    • 4
  • James Schmeidler
    • 2
  • Panteleimon Giannakopoulos
    • 4
    • 5
  • Helmut Heinsein
    • 6
  • Christoph Schmitz
    • 7
  • Patrick R. Hof
    • 1
  1. 1.Fishberg Department of NeuroscienceMount Sinai School of MedicineNew YorkUSA
  2. 2.Department of PsychiatryMount Sinai School of MedicineNew YorkUSA
  3. 3.Seaver Autism CenterMount Sinai School of MedicineNew YorkUSA
  4. 4.Department of Mental Health and PsychiatryUniversity Hospitals and School of MedicineGenevaSwitzerland
  5. 5.Department of PsychiatryUniversity of Lausanne School of MedicineLausanneSwitzerland
  6. 6.Morphological Brain Research Unit, Department of Psychiatry, Psychosomatics, and PsychotherapyUniversity of WuerzburgWuerzburgGermany
  7. 7.Department of Neuroanatomy, School of MedicineLudwig-Maximilians UniversityMunichGermany

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