Myelin Quantification in White Matter Pathology of Progressive Multiple Sclerosis Post-Mortem Brain Samples: A New...

Area of Science:

• Neuroscience
• Pathology
• Digital Image Analysis

Background:

• Multiple sclerosis (MS) is a central nervous system (CNS) disease characterized by demyelination and neurodegeneration.
• While remyelination can occur, quantifying its extent in MS lesions is challenging.
• Standardized digital methods for myelin quantification in MS are currently lacking.

Purpose of the Study:

• To present and validate a novel, standardized digital method for myelin quantification in progressive MS brains.
• To enable more precise study of myelin content in MS lesions.
• To establish a reliable tool for assessing myelination in human post-mortem samples.

Main Methods:

• A novel myelin quantification method (MQM) was developed and applied using ImageJ software.
• Tissue sections from 14 progressive MS cases and 5 controls were stained for myelin using luxol fast blue (LFB).
• Three independent raters assessed myelin quantity, and inter-rater reliability was calculated using the intraclass correlation coefficient (ICC).

Main Results:

• The developed MQM demonstrated excellent inter-rater agreement (ICC = 0.96).
• The method showed high reliability with a narrow range of agreement (-5.93% to 18.43% variation).
• The method was extended to diffusely appearing white matter (DAWM) and encephalitis, suggesting broader applicability.

Conclusions:

• A novel, reliable, and accurate digital tool for myelin quantification in human post-mortem samples has been established.
• This method builds upon established histopathological techniques, offering a quantitative measurement for myelination assessment.
• The MQM facilitates precise study of myelin content in MS and potentially other neurological conditions.