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Progressive degeneration of nonphosphorylated neurofilament protein‐enriched pyramidal neurons predicts cognitive impairment in Alzheimer's disease: Stereologic analysis of prefrontal cortex area 9
Author(s) -
Bussière Thierry,
Giannakopoulos Panteleimon,
Bouras Constantin,
Perl Daniel P.,
Morrison John H.,
Hof Patrick R.
Publication year - 2003
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.10760
Subject(s) - neocortex , neuroscience , neurofilament , prefrontal cortex , biology , cerebral cortex , cortex (anatomy) , pathology , cognition , medicine , immunohistochemistry , immunology
We performed a stereologic analysis of a subset of pyramidal neurons known to be vulnerable in Alzheimer's disease (AD) and characterized by particularly high somatodendritic levels of nonphosphorylated neurofilament protein. In the neocortex, these large pyramidal neurons reside in the deep part of layer III (layer IIIc) and the superficial part of layer V (layer Va). We focused on prefrontal cortex area 9 in elderly control cases in comparison to cases with different degrees of cognitive dysfunction. The results confirmed that these neurons are preferentially vulnerable in AD, as their numbers decrease dramatically in cases with definite dementia, correlating strongly with the severity of the disease, to a nearly complete loss (>90%) in the endstages of AD. Furthermore, a triple‐labeling experimental paradigm revealed that these particular neurons are far more likely to develop neurofibrillary tangles (NFT) and do so at a faster rate than other pyramidal cells. Nonphosphorylated neurofilament protein‐rich neurons also shrink considerably during formation of NFT and the largest among them are preferentially affected. Laminar differences in the severity of these effects were observed, layer Va being more severely affected, possibly correlating with the involvement of specific cortical projections. These data reveal that different populations of neurons prone to NFT formation are lost at different rates in AD, and that nonphosphorylated neurofilament protein‐enriched neurons emerge as a strikingly vulnerable subpopulation of neurons. Their preferential involvement suggests that neurons providing specific corticocortical connections between association areas are at high risk for degeneration in AD. J. Comp. Neurol. 463:281–302, 2003. © 2003 Wiley‐Liss, Inc.