Striated muscle tropomyosin-enriched microfilaments of developing muscles of chicken embryos
Journal of Muscle Research and Cell Motility, ISSN: 0142-4319, Vol: 11, Issue: 3, Page: 191-202
1990
- 12Citations
- 4Captures
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Metrics Details
- Citations12
- Citation Indexes12
- 12
- CrossRef10
- Captures4
- Readers4
Article Description
The striated muscle tropomyosin-enriched microfilaments were isolated from developing muscles in ovo by the previously described method with a monoclonal antibody against striated muscle isoforms of tropomyosin (Lin & Lin, 1986). Two-dimensional gel analysis of the isolated microfilaments from developing heart, thigh and breast muscles revealed the coexistence of non-muscle isoforms of tropomyosin and actin throughout all stages of embryogenesis. A small but significant amount of skeletal muscle isoforms (α, β) of tropomyosins and their phosphorylated forms was detected in the microfilaments isolated from hearts of 6-15-day-old embryos. These skeletal isoforms of tropomyosins disappeared after this stage of embryogenesis. In addition, we also detected both embryonic and adult isoforms of troponin T in early developing hearts. In developing thigh and breast muscles, the presence of non-muscle tropomyosin isoforms 2, 3a and 3b in the isolated microfilaments was apparent. The contents of tropomyosin isoform 2 were decreased with development and this non-muscle isoform completely disappeared at the 15th day of embryogenesis. On the other hand, the non-muscle tropomyosin isoforms 3a and 3b were present throughout all stages of development. Double-label immunofluorescence microscopy with monoclonal CH1 (anti-striated muscle isoforms of tropomyosin) and CG β6 (anti-non-muscle isoforms of tropomyosin) on the isolated, glycerinated skeletal and cardiac muscle cells of 10-day-old or 13-day-old embryos confirmed the colocalization of muscle and non-muscle isoforms of tropomyosins within the same cells. These results suggest that different isoforms of actin and tropomyosin can assemble into a class of microfilaments (i.e. striated muscle tropomyosin-enriched microfilaments)in ovo, which may transform into the thin filaments of mature muscle cells. © 1990 Chapman and Hall Ltd.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0025293491&origin=inward; http://dx.doi.org/10.1007/bf01843573; http://www.ncbi.nlm.nih.gov/pubmed/2205632; http://link.springer.com/10.1007/BF01843573; https://dx.doi.org/10.1007/bf01843573; https://link.springer.com/article/10.1007/BF01843573; http://www.springerlink.com/index/10.1007/BF01843573; http://www.springerlink.com/index/pdf/10.1007/BF01843573
Springer Science and Business Media LLC
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