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SMI-32 immunoreactivity in human striate cortex during postnatal development.

L C Ang1, D G Munoz, D Shul

  • 1Department of Pathology [Neuropathology], University of Saskatchewan, Saskatoon, Canada.

Brain Research. Developmental Brain Research
|July 16, 1991
PubMed
Summary
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This study tracked neurofilament development in the human brain using SMI-32 antibody. Neurofilament expression in the striate cortex stabilizes by age 3, offering a marker for neocortical development.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Immunohistochemistry

Background:

  • The striate cortex undergoes significant morphological changes during postnatal development.
  • Neurofilaments are key structural components of neurons, and their phosphorylation state can change during development.

Purpose of the Study:

  • To investigate the temporal sequence of neurofilament maturation in the human striate cortex during postnatal development.
  • To utilize SMI-32 antibody, which targets non-phosphorylated neurofilaments, as a marker for neuronal development.

Main Methods:

  • Human striate cortex samples from 12 autopsied individuals (1 day to 70 years) were analyzed.
  • Avidin-biotin-peroxidase immunohistochemistry was employed to detect SMI-32 immunoreactivity.
  • The distribution and density of SMI-32 immunoreactive neurons were mapped across cortical layers.

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Main Results:

  • SMI-32 immunoreactive neurons were first detected in sublayers Vb/VIa on the first postnatal day.
  • Immunoreactivity expanded to layer IVb by 5 months and to layers III, IVa, IVb, V, and VI by 15 months.
  • SMI-32 immunoreactivity patterns stabilized by 3 years of age.

Conclusions:

  • The study elucidates the developmental timeline of non-phosphorylated neurofilament expression in the human striate cortex.
  • SMI-32 immunoreactivity serves as a valuable morphological correlate for assessing postnatal neocortical development.
  • This marker could aid in the study of developmental neurological disorders affecting the neocortex.