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Development of Teleost Intermuscular Bones Undergoing Intramembranous Ossification Based on
Chun-Hong Nie1,2, Shi-Ming Wan3,4, Yu-Long Liu5
1Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education/Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China. nch44@webmail.hzau.edu.cn.
International Journal of Molecular Sciences
|September 25, 2019
Summary
Intermuscular bone development in fish occurs through intramembranous ossification, not a cartilaginous phase. Key pathways like Wnt and TGF-β are crucial for this bone formation process.
Area of Science:
- Comparative proteomics and histology
- Teleost fish skeletal development
- Molecular mechanisms of ossification
Background:
- Intermuscular bones (IBs) are unique to lower teleost fish.
- The molecular mechanisms driving IB development are not fully understood.
- Investigating IB formation provides insights into vertebrate skeletal evolution.
Purpose of the Study:
- To elucidate the histological structure and proteome of intermuscular bone development in *Megalobrama amblycephala*.
- To identify key molecular pathways and proteins involved in IB ossification.
- To determine if IB development involves a cartilaginous phase.
Main Methods:
- Histological analysis using Alcian blue and alizarin red S staining.
- Comparative proteomic analysis using isobaric tags for relative and absolute quantitation (iTRAQ).
- Functional annotation of differentially expressed proteins.
- Inhibition studies using TGF-β and Wnt pathway inhibitors in zebrafish.
Main Results:
- Intermuscular bones form via intramembranous ossification, lacking a cartilaginous precursor.
- Proteomic analysis identified 3368 proteins, with key roles in calcium, MAPK, Wnt, TGF-β, and osteoclast pathways.
- Proteins associated with osteoblast activity showed increased expression, while chondrocyte markers remained stable.
- Inhibition of TGF-β and Wnt pathways significantly delayed IB development in zebrafish.
Conclusions:
- The study clarifies the intramembranous ossification pattern of intermuscular bone development.
- Wnt and TGF-β signaling pathways are critical regulators of IB formation.
- This research provides a foundation for understanding the molecular basis of IB development in teleosts.
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