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Updated: Jan 18, 2026
Adapting Human Videofluoroscopic Swallow Study Methods to Detect and Characterize Dysphagia in Murine Disease Models
Published on: March 1, 2015
Validation of the FVB/N-Tg(HSA* LR)20bCath mice of myotonic dystrophy using swallowing function assessment,
Rie Asayama1, Kaori Tanaka-Nishikubo1, Jun Iwanami2
1Department of Otolaryngology, Head, and Neck Surgery, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime, Japan.
Abstract:
Myotonic dystrophy is associated with dysphagia, which can lead to severe complications such as aspiration pneumonia and choking. However, few histopathological studies on dysphagia in myotonic dystrophy have been conducted. In this study, we aimed to validate the FVB/N-Tg(HSA*LR)20bCath mice for studying dysphagia associated with myotonic dystrophy, using videofluoroscopic swallowing study, histological analysis, and immunofluorescence analysis. Videofluoroscopic swallowing study, revealed significant abnormalities during the pharyngeal swallowing phase of swallowing in HSA LR20b mice, including increased pharyngeal residue area and prolonged pharyngeal transit time, suggesting that this mouse model was a valuable tool for studying dysphagia in myotonic dystrophy. These findings might represent a characteristic swallowing pattern in myotonic dystrophy. Histological analysis demonstrated marked variability in muscle fiber size and a high frequency of central nuclei. Additionally, decreased expression of chloride channel 1 was observed in the masseter muscle, suggesting the presence of myotonia. Collectively, these findings provide a foundation for further research into the complex mechanisms underlying myotonic dystrophy associated dysphagia and may inform the development of future treatment strategies.
Insights
This study validates a mouse model for myotonic dystrophy-associated dysphagia. The model shows characteristic swallowing issues and muscle abnormalities, aiding future research and treatment strategies.
Area of Science:
- Neurology
- Gastroenterology
- Genetics
Background:
- Myotonic dystrophy frequently causes dysphagia, increasing risks of aspiration pneumonia and choking.
- Histopathological studies on dysphagia in myotonic dystrophy are limited.
- FVB/N-Tg(HSA*LR)20bCath mice (HSA LR20b) are investigated as a model for myotonic dystrophy-associated dysphagia.
Purpose of the Study:
- To validate the HSA LR20b mouse model for studying myotonic dystrophy-associated dysphagia.
- To characterize swallowing abnormalities and underlying muscle pathology in this model.
Main Methods:
- Videofluoroscopic swallowing study (VFSS) to assess swallowing function.
- Histological analysis of muscle tissue.
- Immunofluorescence analysis to evaluate protein expression.
Main Results:
- VFSS revealed significant pharyngeal swallowing abnormalities in HSA LR20b mice, including increased residue and prolonged transit time.
- Histological analysis showed muscle fiber size variability and central nuclei, indicative of myopathy.
- Decreased chloride channel 1 expression in masseter muscle suggested myotonia.
Conclusions:
- The HSA LR20b mouse model effectively replicates key features of myotonic dystrophy-associated dysphagia.
- This model provides a valuable platform for investigating dysphagia mechanisms and developing treatments.
- The observed swallowing pattern may be characteristic of myotonic dystrophy.
