Subfield- and layer-specific changes in parvalbumin, calretinin and calbindin-D28K immunoreactivity in the entorhinal cortex in Alzheimer's disease - PubMed (original) (raw)
Subfield- and layer-specific changes in parvalbumin, calretinin and calbindin-D28K immunoreactivity in the entorhinal cortex in Alzheimer's disease
M Mikkonen et al. Neuroscience. 1999.
Abstract
The entorhinal cortex, which is involved in neural systems related to memory, is selectively degenerated in early Alzheimer's disease. Here, we examined neuropathological changes in the eight entorhinal subfields in post mortem Alzheimer's disease subjects using Thionin and Bielschowsky stains and parvalbumin, calretinin and calbindin-D28k immunohistochemistry. Both histological stains revealed the most dramatic cell loss and neurofibrillary tangle formation to be in layers II and V of the lateral, intermediate and caudal subfields. In accordance, immunohistochemical staining showed that neurons and fibres that contain calcium-binding proteins were also more frequently altered in these subfields than in the rostromedial subfields. Detailed analysis further revealed that non-principal cells containing parvalbumin or calbindin-D28k showed morphological alterations early in the entorhinal pathology of Alzheimer's disease, whereas non-principal neurons containing calretinin were better preserved even in Alzheimer's disease patients with severe entorhinal pathology. The degeneration of parvalbumin-immunoreactive neurons and basket-like networks and calbindin-positive non-principal neurons was observed mainly in layer II, where the calretinin-positive non-principal neurons formed aggregates especially at late stages of the disease. The pyramidal-shaped neurons containing either calretinin or calbindin-D28k were often preserved, although morphological alterations were observed. Our findings indicate that specific subfields of the entorhinal cortex involving neurons that contain distinct calcium-binding proteins are differentially vulnerable in Alzheimer's disease. This could have an impact on the topographically organized inputs and outputs of the entorhinal cortex in Alzheimer's patients.
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