neuropil thread
Abnormal tau-immunoreactive processes in the neuropil, representing a pathological hallmark of Alzheimer's disease and related tauopathies.
Full Definition
Thin, thread-like structures composed of hyperphosphorylated tau protein that accumulate in the neuropil (the dense network of neural processes between cell bodies) in various neurodegenerative diseases, particularly Alzheimer's disease. These threads represent degenerating axons and dendrites that have accumulated abnormal tau protein in a hyperphosphorylated state, leading to disruption of normal cellular transport mechanisms. Neuropil threads are best visualized using tau immunohistochemistry and are considered one of the major pathological lesions in Alzheimer's disease, along with neurofibrillary tangles and neuritic plaques. Their density correlates with cognitive impairment severity and provides important staging information for neurodegenerative disease assessment. Editorial review should ensure proper terminology distinction from other tau pathology and accurate description of detection methods.
Usage
Usage note: Often quantified per unit area; distinguish from neurofibrillary tangles in cell bodies.
In Context
- "Neuropil threads were quantified using AT8 tau immunostaining across multiple cortical regions." — Methods section
- "The density of neuropil threads increased progressively from Braak stages I through VI." — Results analysis