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Substance P immunoreactivity in Rett syndrome
K Deguchi1, B A Antalffy, L J Twohill
1Rett Center, Houston, TX, USA.
Pediatric Neurology
|May 2, 2000
Summary
Rett syndrome (RS) is linked to severe autonomic dysfunction. Reduced Substance P, a key neurotransmitter, in specific brain areas may cause this dysfunction in RS patients.
Area of Science:
- Neuroscience
- Autonomic Nervous System Research
- Neurodegenerative Diseases
Background:
- Rett syndrome (RS) is characterized by severe autonomic dysfunction.
- Substance P, a peptide found in the nervous system, is reduced in RS patients' cerebrospinal fluid.
Purpose of the Study:
- To compare Substance P and astrocyte distribution in the brains of RS patients and controls.
- To investigate the link between reduced Substance P and autonomic dysfunction in RS.
Main Methods:
- Immunohistochemical analysis of brain tissue from 14 RS patients and 10 controls.
- Quantification of Substance P immunoreactivity and glial fibrillary acidic protein (GFAP)-positive astrocytes.
- Comparison of neurochemical markers between RS and age-matched normal brains.
Main Results:
- Significantly decreased Substance P immunoreactivity in key autonomic control regions of RS brains (e.g., spinal cord, solitary tract, reticular nuclei, locus ceruleus).
- Less significant decreases in other brain regions, including the cortex and basal ganglia.
- Increased GFAP-positive astrocytes observed in areas with reduced Substance P and elsewhere in RS brains.
Conclusions:
- Reduced Substance P in specific brain regions, particularly those controlling the autonomic nervous system, likely contributes to autonomic dysfunction in Rett syndrome.
- Astrogliosis (increased astrocytes) is a prominent feature in the brains of RS patients.
- These findings highlight a potential neurochemical basis for autonomic dysregulation in RS.