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Related Experiment Videos

Reduced nerve growth factor in Rett syndrome postmortem brain tissue.

J D Lipani1, M B Bhattacharjee, D M Corey

  • 1Division of Neuroscience, Tulane University School of Medicine, New Orleans, Louisiana 70112, USA.

Journal of Neuropathology and Experimental Neurology
|November 18, 2000
PubMed
Summary

Reduced nerve growth factor (NGF) and trkA receptor levels are implicated in Rett syndrome (RS) brain pathology. This study found significantly lower NGF and trkA in RS brains, suggesting impaired developmental signaling.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Rett syndrome (RS) is a neurodevelopmental disorder.
  • The role of nerve growth factor (NGF) and its receptor trkA in RS pathophysiology is unclear.

Purpose of the Study:

  • To investigate the levels of NGF and trkA in the frontal cortex of individuals with Rett syndrome.
  • To determine if reduced NGF and/or trkA contribute to the neurobiological basis of RS.

Main Methods:

  • Immunohistochemistry was used to quantify NGF and trkA expression in human autopsy brain tissue.
  • Frontal cortex samples from 9 RS females and 10 age-matched female controls were analyzed.
  • Glial fibrillary acidic protein (GFAP) immunostaining was used to assess cortical astrogliosis.

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Main Results:

  • A significant reduction in NGF expression was observed in RS patients compared to controls (p < 0.001).
  • All RS brains showed NGF levels at or below the minimum control level, with 3 brains having undetectable NGF.
  • TrkA expression was also significantly reduced in the RS group (p = 0.035).
  • NGF expression in RS was strongly correlated with the presence of cortical astrogliosis (r = 0.91).

Conclusions:

  • Reduced levels of NGF and its receptor trkA are associated with the pathophysiology of Rett syndrome.
  • The findings suggest an impairment in critical developmental signaling pathways for NGF production in RS.
  • While injury-induced NGF production signals may remain intact, early developmental NGF signaling is compromised in RS.