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Abnormalities of the nucleus basalis in Down's syndrome
Annals of Neurology
|September 1, 1985
Summary
Individuals with Down's syndrome have fewer neurons in the nucleus basalis of Meynert (nbM). This reduction may worsen with age, potentially contributing to Alzheimer's disease-like symptoms.
Area of Science:
- Neuroscience
- Genetics
- Pathology
Background:
- Down's syndrome is associated with profound intellectual disability.
- Alzheimer's disease pathology, including neuron loss in the nucleus basalis of Meynert (nbM), is common in older individuals with Down's syndrome.
Purpose of the Study:
- To quantify nbM neurons in individuals with Down's syndrome.
- To compare nbM neuron counts with age-matched controls.
- To investigate age-related changes in nbM neuron numbers in Down's syndrome.
Main Methods:
- Histological examination of brain sections from 5 Down's syndrome patients and 5 controls.
- Measurement of the number and size of neurons in the nbM.
- Age-matching of patient and control groups.
Main Results:
- Patients with Down's syndrome had 29% fewer nbM neurons compared to controls.
- Neuron size in the nbM did not significantly differ between groups.
- The oldest patient with Down's syndrome exhibited the lowest nbM neuron count.
Conclusions:
- Young individuals with Down's syndrome exhibit reduced nbM neuron numbers.
- nbM neuron loss may increase with age in Down's syndrome.
- This neuronal deficit could underlie Alzheimer's disease features in Down's syndrome.