Schaub, Leandra; Lagou, Aikaterini; Ait-Lounis, Aouatef; Kiliaridis, Stavros; Antonarakis, Gregory S (2024). Effects of age and diet consistency on the expression of myosin heavy-chain isoforms on jaw-closing and jaw-opening muscles in a rat model. Journal of oral rehabilitation, 51(6), pp. 1016-1024. Wiley 10.1111/joor.13676
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J_of_Oral_Rehabilitation_-_2024_-_Schaub_-_Effects_of_age_and_diet_consistency_on_the_expression_of_myosin_heavy_chain.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (1MB) | Preview |
BACKGROUND
Skeletal craniofacial morphology can be influenced by changes in masticatory muscle function, which may also change the functional profile of the muscles.
OBJECTIVES
To investigate the effects of age and functional demands on the expression of Myosin Heavy-Chain (MyHC) isoforms in representative jaw-closing and jaw-opening muscles, namely the masseter and digastric muscles respectively.
METHODS
Eighty-four male Wistar rats were divided into four age groups, namely an immature (n = 12; 4-week-old), early adult (n = 24; 16-week-old), adult (n = 24; 26-week-old) and mature adult (n = 24; 38-week-old) group. The three adult groups were divided into two subgroups each based on diet consistency; a control group fed a standard (hard) diet, and an experimental group fed a soft diet. Rats were sacrificed, and masseter and digastric muscles dissected. Real-time quantitative polymerase chain reaction was used to compare the mRNA transcripts of the MyHC isoforms-Myh7 (MyHC-I), Myh2 (MyHC-IIa), Myh4 (MyHC-IIb) and Myh1 (MyHC-IIx)-of deep masseter and digastric muscles.
RESULTS
In the masseter muscle, hypofunction increases Myh1 (26, 38 weeks; p < .0001) but decreases Myh4 (26 weeks; p = .046) and Myh2 (26 weeks; p < .0001) expression in adult rats. In the digastric muscle, hypofunction increases Myh1 expression in the mature adult rats (38 weeks; p < .0001), while Myh2 expression decreases in adult rats (26 weeks; p = .021) as does Myh4 (26 weeks; p = .001). Myh7 expression is increased in the digastric muscle of mature adult rats subjected to hypofunction (38 weeks; p = <.0001), while it is very weakly expressed in the masseter.
CONCLUSION
In jaw-opening and jaw-closing muscles, differences in myosin expression between hard- and soft-diet-fed rats become evident in adulthood, suggesting that long-term alteration of jaw function is associated with changes in the expression of MyHC isoforms and potential fibre remodelling. This may give insight into the role of function on masticatory muscles and the resultant craniofacial morphology.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
04 Faculty of Medicine > School of Dental Medicine > Department of Orthodontics |
UniBE Contributor: |
Kiliaridis, Stavros |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
1365-2842 |
Publisher: |
Wiley |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
14 Mar 2024 07:48 |
Last Modified: |
28 Apr 2024 00:16 |
Publisher DOI: |
10.1111/joor.13676 |
PubMed ID: |
38475932 |
Uncontrolled Keywords: |
aging jaw muscles messenger RNA myosin heavy chains rats soft diet |
BORIS DOI: |
10.48350/194215 |
URI: |
https://boris.unibe.ch/id/eprint/194215 |
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