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Myelin Methods: A Mini-Review
Brad Bolon1, Amber Moser2, Elizabeth Chlipala2
1GEMpath, Inc., Longmont, Colorado, USA.
Abstract:
Hematoxylin and eosin (H&E) staining is a suitable approach for detecting substantial structural changes in neural tissues but is less sensitive for identifying subtle alterations to subcellular structures and various chemical constituents, including myelin. Neurohistological methods to better evaluate myelin integrity by light microscopy include acidophilic dyes (eg, eriochrome cyanine R, toluidine blue [used with hard plastic sections]); lipoprotein-binding dyes (eg, Luxol fast blue [LFB], Weil's iron hematoxylin); lipid impregnation with metals (eg, Marchi's, which uses osmium tetroxide for en bloc staining before embedding); and immunohistochemical (IHC) methods to highlight various antigens (eg, myelin basic protein [MBP] and peripheral myelin protein 22 [PMP22]). Some IHC methods reveal enhanced marker expression in damaged myelin (eg, matrix metalloproteinase-9 [MMP9], S100). In neuropathology investigations, H&E is the first-tier screening method, whereas myelin stains (often LFB alone or in combination with dyes that highlight other structural elements) are second-tier procedures performed in combination with other neurohistological procedures to examine neuroaxonal injury and/or glial responses. The choice of myelin method depends on such considerations as cost, institutional preference, the procedure (fixation and embedding medium), and the study objective.
Insights
Hematoxylin and eosin staining detects major neural tissue changes, but specialized myelin stains are crucial for identifying subtle damage to myelin sheaths. These advanced neurohistological methods improve the evaluation of myelin integrity in neuropathology.
Area of Science:
- Neuroscience
- Histopathology
- Biochemistry
Background:
- Hematoxylin and eosin (H&E) staining is a standard method for initial assessment of neural tissue structure.
- H&E has limitations in detecting subtle subcellular alterations and evaluating myelin integrity.
- Myelin, a crucial component of neural tissue, requires specific staining techniques for accurate assessment.
Purpose of the Study:
- To review and compare various neurohistological methods for evaluating myelin integrity.
- To highlight the advantages of specific myelin stains over H&E for detecting subtle neuropathological changes.
- To guide the selection of appropriate myelin staining techniques based on study objectives and practical considerations.
Main Methods:
- Discussion of acidophilic dyes (eriochrome cyanine R, toluidine blue) and lipoprotein-binding dyes (Luxol fast blue, Weil's iron hematoxylin).
- Inclusion of lipid impregnation techniques (Marchi's method with osmium tetroxide).
- Exploration of immunohistochemical (IHC) methods targeting myelin antigens (MBP, PMP22) and damage markers (MMP9, S100).
Main Results:
- H&E is effective for gross structural changes but lacks sensitivity for myelin alterations.
- Specialized myelin stains offer enhanced sensitivity for detecting subtle myelin damage and integrity.
- IHC methods can identify specific molecular markers associated with myelin damage.
Conclusions:
- Myelin stains are essential second-tier procedures in neuropathology, complementing H&E for comprehensive neuroaxonal injury assessment.
- The choice of myelin staining method depends on factors like cost, fixation, embedding medium, and research goals.
- Advanced neurohistological techniques are vital for a thorough understanding of myelin pathology.
