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Spectrin and calmodulin in spreading mouse blastomeres.
J S Sobel1, E G Goldstein, J M Venuti
1Department of Anatomical Sciences, State University of New York, Buffalo 14214.
Developmental Biology
|March 1, 1988
Summary
Spectrin and calmodulin play coordinated roles in mouse blastomere spreading. These proteins associate with actin and myosin, suggesting spectrin
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Blastomere spreading is crucial for early embryonic development.
- The molecular mechanisms regulating blastomere spreading are not fully understood.
- Spectrin and calmodulin are calcium-binding proteins implicated in cytoskeletal organization.
Purpose of the Study:
- To investigate the role of spectrin and its association with calmodulin in mouse blastomere spreading.
- To elucidate the molecular interactions and localization patterns of spectrin and calmodulin during blastomere spreading.
Main Methods:
- Blot overlay technique using 125I-calmodulin to assess spectrin-calmodulin binding.
- Double-labeling immunofluorescence microscopy to visualize protein localization.
- Co-localization studies with actin and myosin.
Main Results:
- Embryonic spectrin binds calmodulin in a calcium-dependent manner.
- Spectrin and calmodulin exhibit coordinated redistribution during active blastomere spreading.
- Both proteins concentrate in spherical bodies and a subcortical ring at the cell-substrate contact region.
- Localization patterns of spectrin and calmodulin are coordinated with actin and myosin.
Conclusions:
- Spectrin is involved in the spreading of mouse blastomeres.
- Spectrin's function in spreading may involve its linkage with calmodulin and the cortical contractile apparatus.
- This study provides insights into the cytoskeletal dynamics underlying early embryonic cell movements.