Histological and reference system for the analysis of mouse intervertebral disc

Area of Science:

• Orthopedics and Musculoskeletal Research
• Developmental Biology
• Comparative Pathology

Background:

• Intervertebral disc (IVD) degeneration is a significant health concern.
• Standardized methods for assessing IVD changes in mouse models are lacking.
• Mouse models are crucial for understanding IVD degeneration and repair.

Purpose of the Study:

• To establish a reliable scoring system for evaluating mouse intervertebral disc (IVD) histo-morphology.
• To assess IVD changes in various mouse models, including different ages, transgenic strains, and induced degeneration models.
• To provide a standardized tool for consistent IVD assessment across research settings.

Main Methods:

• Development of a scoring system based on histo-morphological features of nucleus pulposus (NP) and annulus fibrosus (AF).
• Assessment of IVDs from mice of varying ages, transgenic strains, and induced degeneration models.
• Evaluation of scoring consistency between experienced and new users.

Main Results:

• The scoring system effectively differentiated normal, early, and late stages of IVD degeneration.
• Key features like NP cellularity, AF lamellar structure, and NP/AF clefts were categorized.
• High inter-observer reliability was achieved, demonstrating consistent scoring.

Conclusions:

• The developed histo-morphological scoring system is effective for assessing IVD changes in diverse mouse models.
• This tool is applicable from post-natal to aged mice, facilitating cross-study comparisons.
• The system addresses a critical need for normalized IVD assessment in mouse research.