Full- versus Sub-Regional Quantification of Amyloid-Beta Load on Mouse Brain Sections

Area of Science:

• Neuroscience
• Pathology
• Biomedical Research

Background:

• Extracellular amyloid-beta (Aβ) plaques are key pathological hallmarks of Alzheimer's disease (AD).
• Transgenic mouse models overexpressing amyloid precursor protein are crucial for studying AD pathology and testing treatments.
• Immunoassays like ELISA and immunostaining are standard for quantifying Aβ load in AD mouse models.

Purpose of the Study:

• To investigate the impact of region of interest (ROI) size on Aβ load measurements in AD mouse brain tissue using immunostaining.
• To compare Aβ quantification results obtained from full brain sections versus selected sub-regions.

Main Methods:

• Developed and described a protocol for brain tissue preparation and free-floating section immunostaining.
• Utilized image analysis software to quantify Aβ load in full and sub-regions of interest.
• Applied the protocol to brain sections from 13-month-old APP/PS1 double transgenic male mice.

Main Results:

• Demonstrated the impact of ROI size selection on Aβ-positive area quantification.
• Showed a strong correlation between Aβ load measurements from full-region and sub-region analyses.
• Validated the chosen methods for widespread Aβ deposition in APP/PS1 mice.

Conclusions:

• The size of the region of interest significantly impacts Aβ quantification in immunostained AD mouse brain tissue.
• Both full-region and sub-region analyses provide reliable and correlated measurements of Aβ load.
• This protocol offers valuable insights for standardizing Aβ quantification in AD research.