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Staining Methods for Normal and Regenerative Myelin in the Nervous System
Víctor Carriel1,2, Antonio Campos3,4, Miguel Alaminos3,4
1Tissue Engineering Group, Department of Histology, Faculty of Medicine, University of Granada, Avenida de la investigación n° 11, Torre A, 5ª planta, 18016, Granada, Spain. vcarriel@ugr.es.
Insights
This study presents three histochemical staining methods for identifying myelin in fixed tissues. These techniques, including Luxol Fast Blue and osmium tetroxide, offer reliable myelin visualization for research.
Area of Science:
- Neuroscience
- Histology
- Biochemistry
Background:
- Histochemical techniques are crucial for identifying specific cellular and tissue components.
- Myelin identification is essential for studying neurological disorders and tissue integrity.
- Existing methods may have limitations with formalin-fixed and paraffin-embedded (FFPE) tissues.
Purpose of the Study:
- To describe and evaluate three distinct histochemical staining methods for myelin.
- To assess the suitability of these methods for routine use with FFPE tissues.
- To provide reliable options for visualizing myelin and associated structures in diverse samples.
Main Methods:
- Conventional Luxol Fast Blue (LFB) staining for myelin, Nissl bodies, and mast cells.
- MCOLL staining, a Luxol Fast Blue-based method, for myelin and collagen fibers.
- Osmium tetroxide staining for myelin and other lipids in fixed tissues prior to embedding.
Main Results:
- Luxol Fast Blue (LFB) successfully stained myelin blue, with Nissl bodies and mast cells appearing purple.
- MCOLL provided a combined overview of myelin and collagen fibers, enhancing histological context.
- Osmium tetroxide staining resulted in a permanent positive reaction for myelin and lipids.
Conclusions:
- The described histochemical methods are effective for myelin identification in FFPE tissues.
- These techniques offer versatility for visualizing myelin and related tissue components.
- The methods provide valuable tools for histological analysis in neuroscience and pathology research.
Abstract:
Histochemical techniques enable the specific identification of myelin by light microscopy. Here we describe three histochemical methods for the staining of myelin suitable for formalin-fixed and paraffin-embedded materials. The first method is conventional luxol fast blue (LFB) method which stains myelin in blue and Nissl bodies and mast cells in purple. The second method is a LBF-based method called MCOLL, which specifically stains the myelin as well the collagen fibers and cells, giving an integrated overview of the histology and myelin content of the tissue. Finally, we describe the osmium tetroxide method, which consist in the osmication of previously fixed tissues. Osmication is performed prior the embedding of tissues in paraffin giving a permanent positive reaction for myelin as well as other lipids present in the tissue.
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