TAR-DNA binding protein 43 in Pick disease

Area of Science:

• Neuropathology
• Neurodegenerative Diseases
• Frontotemporal Dementia

Background:

• Pick disease (PiD) is a frontotemporal dementia defined by specific neuropathological hallmarks.
• These include frontal and temporal atrophy, neuronal loss, gliosis, and characteristic Pick bodies.
• TAR-DNA binding protein 43 (TDP-43) is implicated in other neurodegenerative conditions like frontotemporal lobar degeneration and amyotrophic lateral sclerosis.

Purpose of the Study:

• To investigate the presence and significance of TDP-43 in Pick disease.
• To determine if TDP-43 pathology is a common feature across all PiD cases.

Main Methods:

• Immunohistochemical analysis was performed on fifteen cases of Pick disease.
• Tissues were examined for the presence of tau, ubiquitin, and TDP-43.

Main Results:

• Five out of fifteen PiD cases exhibited intracytoplasmic inclusions positive for ubiquitin, tau, and TDP-43, alongside Pick bodies.
• These TDP-43 positive inclusions were smaller than the typical Pick bodies.

Conclusions:

• The presence of TDP-43 inclusions in a subset of PiD cases suggests its potential role in the disease.
• TDP-43 accumulation may be a shared mechanism in various neurodegenerative diseases.
• The variability in TDP-43 presence indicates potential distinct pathological pathways within Pick disease.