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Updated: Apr 12, 2026
Chromatin Immunoprecipitation Assay for Tissue-specific Genes using Early-stage Mouse Embryos
Published on: April 29, 2011
Expression of myostatin in early postnatal mouse masseter and rectus femoris muscles
Hiroshi Takada1, Yoko Miwa1, Iwao Sato2
1Department of Anatomy, School of Life Dentistry at Tokyo, The Nippon Dental University, Japan.
Aims:
Myostatin (Mstn) is a member of the transforming growth factor-β (TGF-β) family that inhibits muscle differentiation. In this study, we aimed to identify the relationships between Mstn, thyroid hormone receptor alpha (TRα), and myosin heavy chain (MyHC) isoform expression during early postnatal development.
Methods:
We investigated the expression of Mstn, TRα, and MyHCs (embryonic, slow, IIa, IIb, and IIx) using quantitative real-time RT-PCR and ELISA (Mstn) in postnatal mouse muscles between day 0 and day 10. We also examined the correlations between Mstn, TR and MyHCs during the early development of mouse masseter muscle (MM) and rectus femoris muscle (RFM).
Results:
Distinct Mstn mRNA expression patterns were observed in the two muscles despite nearly non-significant changes in the Mstn protein abundance in MM. The expression pattern of the TRα mRNA in the MM differed from that observed in the RFM. The expression of MyHC IIa, IIb and IIx mRNAs increased in the MM and decreased in the RFM from day 0 to day 10, whereas embryonic fiber MyHC mRNA expression was similar in both muscle types. Principal component analysis showed the existence of a correlation between: (1) TRα and MyHC, (2) Mstn and MyHC, and (3) TRα and Mstn in MM. The correlations were different in RFM and MM. Cluster analyses identified the distinct clusters: cluster 1, days 0-4 for the MM and day 0 for the RFM; cluster 2, day 6 for the MM and day 2 for the RFM; and cluster 3, days 8-10 for the MM and days 4-10 for the RFM.
Conclusions:
These data suggest that TRα influences MyHC expression in both muscle types. In addition, Mstn has a limited effect in the MM related to the expression of individual MyHCs, as opposed to its role in the RFM, at early postnatal developmental stages. TRα could be involved in regulating both the temporal expression of MyHCs and Mstn at the early postnatal stages in the MM and RFM.
Insights
Thyroid hormone receptor alpha (TRα) influences myosin heavy chain (MyHC) expression in developing mouse muscles. Myostatin (Mstn) shows varied effects on MyHC expression, with TRα potentially regulating both MyHC and Mstn temporal expression.
Area of Science:
- Muscle biology and developmental physiology
- Molecular endocrinology
- Gene expression regulation
Background:
- Myostatin (Mstn), a TGF-β family member, inhibits muscle differentiation.
- Thyroid hormone receptor alpha (TRα) plays a role in muscle development.
- Myosin heavy chain (MyHC) isoforms are critical markers of muscle fiber type and development.
Purpose of the Study:
- To investigate the relationships between Mstn, TRα, and MyHC isoform expression.
- To analyze these relationships during early postnatal development in mouse masseter muscle (MM) and rectus femoris muscle (RFM).
Main Methods:
- Quantitative real-time RT-PCR and ELISA were used to measure Mstn, TRα, and MyHC (embryonic, slow, IIa, IIb, IIx) expression.
- Expression patterns were analyzed in postnatal mouse muscles from day 0 to day 10.
- Correlation and cluster analyses were performed to identify relationships between Mstn, TRα, and MyHCs in MM and RFM.
Main Results:
- Distinct Mstn mRNA expression patterns were observed between MM and RFM.
- TRα mRNA expression patterns also differed between the two muscle types.
- MyHC IIa, IIb, and IIx mRNA expression increased in MM and decreased in RFM, while embryonic MyHC expression was similar.
- Principal component analysis revealed correlations between TRα and MyHC, Mstn and MyHC, and TRα and Mstn in MM, with different correlations in RFM.
- Cluster analysis delineated distinct developmental time points for MM and RFM based on gene expression.
Conclusions:
- TRα appears to influence MyHC expression in both MM and RFM.
- Mstn exhibits a limited role in MM MyHC expression compared to its role in RFM during early postnatal development.
- TRα may be involved in regulating the temporal expression of MyHCs and Mstn in both muscle types during early postnatal stages.
