Expression of MyHC isoforms mRNA transcripts in different regions of the masseter and medial pterygoid muscles in chimpanzees

Publication date: November 2017
Source:Archives of Oral Biology, Volume 83
Author(s): Neus Ciurana, Rosa Artells, Carmen Muñoz, Júlia Arias-Martorell, Gaëlle Bello-Hellegouarch, Alejandro Pérez-Pérez, Juan Francisco Pastor, Josep Maria Potau
ObjectiveThe aim of this study is to examine the expression pattern of the different myosin heavy chain (MyHC) isoforms in the masseter and medial pterygoid muscles by real time quantitative polymerase chain reaction (RT-qPCR) to obtain information at molecular level which can be related to the functional characteristics of these two muscles.DesignThe masseter, deep and superficial portion, and medial pterygoid muscles of five adult Pan troglodytes were dissected in order to obtain samples of the anterior and posterior regions of each portion of the masseter and of the medial pterygoid. The expression of MyHC isoforms mRNA transcripts was analyzed by RT-qPCR.ResultsNo significant differences in expression of MyHC isoforms between the masseter and the medial pterygoid were found. In contrast, when comparing the superficial and the deep portion of the masseter, we found that the MyHC-IIM isoform was expressed at a significantly higher level in the superficial portion.ConclusionsThe superficial portion of the masseter and the medial pterygoid muscle have the same expression pattern regarding the different MyHC isoforms. On the other hand, the deep portion of the masseter, which is activated mainly during lateral and repositioning movements of the mandible, has a lower MyHC-IIM isoform expression than the superficial portion. Our findings provide new data on functional aspects of the masseter and medial pterygoid that can complement results obtained by other techniques.

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