Synapse loss in frontal cortex biopsies in Alzheimer's disease: Correlation with cognitive severity

Authors

  • Steven T. DeKosky Dr., MD,

    Corresponding author
    1. Departments of Neurology, and Anatomy and Neurobiology, and Sanders Brown Center on Aging, Lexington Veterans Administration and University of Kentucky Medical Centers, Lexington, KY
    • Alzheimer's Disease Research Center, Suite 400, Iriquois Building, University of Pittsburgh, 3600 Forbes Ave, Pittsburgh, PA 15213
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  • Stephen W. Scheff PhD

    1. Departments of Neurology, and Anatomy and Neurobiology, and Sanders Brown Center on Aging, Lexington Veterans Administration and University of Kentucky Medical Centers, Lexington, KY
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Abstract

Ultrastructural studies of biopsied cortical tissue from the right frontal lobe of 8 patients with mild to moderate Alzheimer's disease (AD) revealed that the number of synapses in lamina III of Brodmann's area 9 was significantly decreased when compared with the number in age-matched control brains (n = 9; postmortem time, < 13 hours). Further decline in synaptic number was seen in age-matched autopsied AD specimens. In the AD brains there was significant enlargement of the mean apposition length, which correlated with degree of synapse loss; as synapse density declined, synapse size increased. The enlargement of synapses, coupled with the decrease in synaptic number, allowed the total synaptic contact area per unit volume to remain stable in the patients who underwent biopsy. In autopsied subjects who had AD, there was no further enlargement of mean synaptic contact area. There was a significant correlation between synapse counts and scores on the Mini-Mental State examination in the patients who underwent biopsy. Lower mental status scores were associated with greater loss of synapses. Choline acetyltransferase activity was significantly decreased in the biopsied group and declined further in the autopsied specimens of AD. There was no relationship between choline acetyltransferase activity and scores on the Mini-Mental State examination or synapse number. There is evidence of neural plasticity in the AD neuropil; synaptic contact size increased in patients who had biopsy and possibly compensated for the numerical loss of synapses. But by end stage of the disease, the ability of the cortex to compensate was exceeded and both synapse number and synaptic contact area declined. The loss of neuronal connectivity, indexed by loss of synapses, predicted the degree of cognitive impairment in the patients who underwent biopsy and indicated a degree of structural change in AD brain not likely to be affected by pharmacotherapy.

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