Neurofibrillary pathology in progressive supranuclear palsy

Area of Science:

• Neuropathology
• Neurodegenerative Diseases
• Electron Microscopy

Background:

• Progressive supranuclear palsy (PSP) is a rare neurodegenerative disorder.
• Neurofibrillary tangles (NFTs) are a hallmark of several neurodegenerative diseases, including PSP and Alzheimer's disease.
• The ultrastructural composition of NFTs in PSP has been a subject of investigation.

Purpose of the Study:

• To elucidate the fine structure of subcortical neurofibrillary tangles (NFTs) in two distinct cases of progressive supranuclear palsy (PSP).
• To compare the ultrastructural morphology of NFTs in PSP with those observed in Alzheimer's disease.

Main Methods:

• Analysis of subcortical brain tissue from two PSP patients using electron microscopy.
• Detailed examination of the ultrastructural composition of neurofibrillary tangles (NFTs).

Main Results:

• In one PSP case, NFTs comprised a mixture of 13-16 nm straight filaments and paired helical filaments (PHF) characteristic of Alzheimer's disease.
• In the second PSP case, NFTs were primarily composed of straight tubules with occasional segments of unusual twisted fibrils.
• The co-occurrence of straight and PHF in NFTs from a PSP case was observed.

Conclusions:

• Neurofibrillary tangles (NFTs) in progressive supranuclear palsy (PSP) exhibit heterogeneous ultrastructural features.
• The presence of paired helical filaments (PHF) in PSP NFTs suggests a potential overlap in pathological mechanisms with Alzheimer's disease.
• NFTs in PSP may share similarities with Alzheimer-type NFTs found in various neurological conditions.