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Histological changes and changes in the myosin mRNA content of the porcine masticatory muscles after masseter treatment with botulinum toxin A

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Abstract

Objectives

Botulinum toxin A (Botox) is increasingly used for treatment of muscle hyperfunction. For a better understanding of the possible morphologic and chewing changes in patients induced by a therapy with Botox, muscle fiber and myosin heavy chain (MyHC) mRNA alterations were examined in this animal study.

Materials and methods

The investigation was carried out on 14-week-old pigs (seven treated animals, eight controls; calculated animal size with a power of 0.5). To initialise the total immobilisation of the right masseter, the Botox injection was distributed into ten areas. After a 56-day period, muscle tissue was taken from the left and right side of the masseter (three regions), temporal (two regions), medial pterygoid and geniohyoid muscles using a standardized method. The muscle fiber cross sections were examined immunohistochemically. Fiber staining was accomplished with antibodies to specific MyHC isoforms. The MyHC mRNA changes were analysed using real-time RT-PCR.

Results

Muscles adapt to such stress by changing fiber types and MyHC mRNA content. Paralysed masseters display atrophic changes while other masticatory muscles show hypertrophic changes. The results indicated that the typical distributions of type IIa und IIb fiber types in masticatory muscles were increased in the masseter muscles due to Botox application. On the other hand, the masseters without Botox in the treated group showed a significant increase of type I MyHC.

Conclusions

Application of Botox may lead to uncontrolled structural changes in affected and unaffected muscles.

Clinical relevance

Treatment of muscle hypertrophy with Botox may cause muscle imbalance.

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Conflicts of interest

The authors declare that they have no conflict of interest.

Author information

Authors and Affiliations

  1. Department of Orthodontics, Technische Universität Dresden, Fetscherstr. 74, 01307, Dresden, Germany

    T. Gedrange

  2. Department of Orthodontics, Preventive and Paediatric Dentistry, Centre of Dentistry and Oral Health, Ernst Moritz Arndt University, Rotgerberstr. 8, 17475, Greifswald, Germany

    T. Gredes, A. Spassov & C. Kunert-Keil

  3. Department of Oral and Maxillofacial Surgery, Technische Universität Dresden, Dresden, Germany

    R. Mai

  4. Institute of Pharmacology and Toxicology, Friedrich Schiller University, Jena, Germany

    D. U. Kuhn

  5. Dental Surgery Department, Silesian Piast Medical University, 26 Krakowska st., Wrocław, 50-424, Poland

    M. Dominiak

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  1. T. Gedrange
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  2. T. Gredes
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  3. A. Spassov
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  4. R. Mai
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  7. C. Kunert-Keil
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Correspondence to C. Kunert-Keil.

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Gedrange, T., Gredes, T., Spassov, A. et al. Histological changes and changes in the myosin mRNA content of the porcine masticatory muscles after masseter treatment with botulinum toxin A. Clin Oral Invest 17, 887–896 (2013). https://doi.org/10.1007/s00784-012-0750-0

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  • DOI: https://doi.org/10.1007/s00784-012-0750-0

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