Genotype-specific differences between mouse CNS stem cell lines expressing frontotemporal dementia mutant or wild...

Area of Science:

• Neuroscience
• Genetics
• Cell Biology

Background:

• Stem cell (SC) lines offer valuable tools for studying genetic disease susceptibility.
• Mouse central nervous system (CNS) neurosphere cultures are potential models for heritable neurodegenerative diseases.

Purpose of the Study:

• To assess the utility of mouse CNS SC-containing neurosphere cultures for studying familial frontotemporal dementia (FTD).
• To compare neurosphere cultures from transgenic mice expressing human tau with a P301L mutation (rTg(tau(P301L))4510) versus wild-type human tau (rTg(tau(wt))21221).

Main Methods:

• Comparison of neurosphere cultures derived from rTg(tau(P301L))4510 and rTg(tau(wt))21221 mice.
• Analysis of tau phosphorylation patterns and cell characteristics in neurosphere cultures.
• Assessment of neuronal filopodia-spine density following differentiation.

Main Results:

• Genotype-specific tau phosphorylation patterns in neurospheres mimicked those observed in the mice.
• Tau in rTg(tau(P301L))4510 cultures was hypophosphorylated compared to rTg(tau(wt))21221 cultures.
• Neurosphere lines maintained SC characteristics over passages, supporting their utility as disease models.

Conclusions:

• Mouse CNS neurosphere cultures accurately model genotype-specific tau phosphorylation relevant to FTD.
• These stem cell cultures serve as effective surrogates for investigating cellular mechanisms of neurodegenerative diseases.
• The findings validate the use of these neurosphere cultures for studying tauopathies and related disorders.