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Neuromuscular junction visualization in paraffin-embedded thyroarytenoid muscle sections: Expanding options beyond
Samuel L Kaefer1, Elizabeth O Shay2, Rachel A Morrison3
1Indiana University School of Medicine (IUSM) Indianapolis Indiana USA.
Laryngoscope Investigative Otolaryngology
|January 9, 2025
Summary
This study introduces a novel method for visualizing neuromuscular junctions (NMJs) in paraffin-embedded muscle tissue, overcoming limitations of traditional frozen sections. This technique enhances histological analysis and preserves tissue morphology for improved research.
Area of Science:
- Neurology
- Histology
- Immunofluorescence
Background:
- Current gold standard for neuromuscular junction (NMJ) visualization uses frozen tissue sections, which have limitations like cryosectioning artifacts and limited shelf-life.
- A method for visualizing NMJs in paraffin-embedded tissue sections has not been previously described.
Purpose of the Study:
- To describe a new methodology for visualizing NMJs in paraffin-embedded thyroarytenoid (TA) muscle sections.
- To overcome the limitations associated with cryosectioned samples.
- To provide a new research tool for neurolaryngology that preserves tissue morphology.
Main Methods:
- Yucatan minipig TA muscle was harvested and prepared as 5-μm thick paraffin-embedded tissue sections.
- Antibodies targeting nicotinic acetylcholine receptors (CHRNα1), synaptic vesicles (SV2), and neurons (NEFL) were utilized.
- An optimized protocol using primary antibodies for neurofilament light chain, nerve synaptic vesicle glycoprotein 2, and the alpha 1 subunit of the nicotinic acetylcholine receptor was developed for complete NMJ visualization.
Main Results:
- Neurofilament (NEFL) and synaptic vesicle glycoprotein (SV2) antibodies successfully demarcated neurons and synaptic vesicles.
- Rabbit anti-nicotinic acetylcholine receptor alpha-1 subunit (CHRNα1) identified acetylcholine receptors in motor endplates.
- Complete NMJ visualization was achieved using the optimized antibody protocol.
Conclusions:
- A novel paraffin-embedded tissue sectioning protocol for NMJ visualization has been established.
- This method avoids limitations of cryosectioned samples and preserves tissue morphology.
- The protocol enhances histological analysis of NMJs, serving as a valuable tool in conjunction with cryosectioning methods.
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