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Updated: Mar 17, 2026
Analysis of Embryonic and Larval Zebrafish Skeletal Myofibers from Dissociated Preparations
Published on: November 13, 2013
Smad4 is required for the development of cardiac and skeletal muscle in zebrafish
Jie Yang1, Junnai Wang1, Zhen Zeng1
1Cancer Biology Research Centre, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030 PR China.
Abstract:
Transforming growth factor-beta (TGF-beta) regulates cellular functions and plays key roles in development and carcinogenesis. Smad4 is the central intracellular mediator of TGF-beta signaling and plays crucial roles in tissue regeneration, cell differentiation, embryonic development, regulation of the immune system and tumor progression. To clarify the role of smad4 in development, we examined both the pattern of smad4 expression in zebrafish embryos and the effect of smad4 suppression on embryonic development using smad4-specific antisense morpholino-oligonucleotides. We show that smad4 is expressed in zebrafish embryos at all developmental stages examined and that embryonic knockdown of smad4 results in pericardial edema, decreased heartbeat and defects in the trunk structure. Additionally, these phenotypes were associated with abnormal expression of the two heart-chamber markers, cmlc2 and vmhc, as well as abnormal expression of three makers of myogenic terminal differentiation, mylz2, smyhc1 and mck. Furthermore, a notable increase in apoptosis was apparent in the smad4 knockdown embryos, while no obvious reduction in cell proliferation was observed. Collectively, these data suggest that smad4 plays an important role in heart and skeletal muscle development.
Insights
Smad4 is crucial for zebrafish embryonic development, particularly heart and skeletal muscle formation. Suppressing Smad4 leads to developmental defects and increased cell death, highlighting its essential role.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Transforming growth factor-beta (TGF-beta) signaling regulates vital cellular functions, including development and cancer.
- Smad4 acts as the central mediator of TGF-beta signaling, influencing tissue regeneration, cell differentiation, and tumor progression.
Purpose of the Study:
- To investigate the role of Smad4 in zebrafish embryonic development.
- To analyze Smad4 expression patterns and the consequences of its suppression during embryogenesis.
Main Methods:
- Examined Smad4 expression in zebrafish embryos across all developmental stages.
- Utilized Smad4-specific antisense morpholino-oligonucleotides to suppress Smad4 function in embryos.
- Assessed embryonic phenotypes, including heart and skeletal muscle development markers, apoptosis, and cell proliferation.
Main Results:
- Smad4 is expressed throughout zebrafish embryonic development.
- Smad4 knockdown resulted in pericardial edema, reduced heartbeat, and trunk structure defects.
- Abnormal expression of heart (cmlc2, vmhc) and skeletal muscle (mylz2, smyhc1, mck) markers was observed.
- Smad4 suppression led to increased apoptosis without significant changes in cell proliferation.
Conclusions:
- Smad4 plays a critical role in the development of the heart and skeletal muscle in zebrafish.
- The findings underscore the importance of Smad4 in embryonic development and cellular integrity.
