Desmosomes isolated from bovine tongue mucosa or muzzle epidermis appeared identical by ultrastructural analyses but had some differences in their polypeptide compositions as determined by SDS-PAGE. These preparations were extracted in 9 M urea, 10 mM Tris-HC1 (pH 9), and 25 mM B-mercaptoethanol and
The fate of desmosomes in trypsinized tissue
โ Scribed by Overton, Jane
- Publisher
- John Wiley and Sons
- Year
- 1968
- Tongue
- English
- Weight
- 840 KB
- Volume
- 168
- Category
- Article
- ISSN
- 0022-104X
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โฆ Synopsis
Embryonic animal epithelial tissue in which desmosomes are well developed has been dispersed by trypsinization and the behavior of desmosomal halves observed. An earlier report left open the question of whether desmosomes were broken down or reincorporated into the reorganized tissue. A more detailed study shows that dispersed cells, or cells which are partially separated, phagocytize half desmosomes left at the cell surface. The resulting vacuoles are angular during early stages of the process indicating that desmosomes are relatively rigid. They later become spherical and characteristic desmosnmal morphology disappears. These results are discussed in connection with morphology in genetic disturbances and in development.
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## Abstract Pronase is a proteolytic enzyme recently introduced as an effective dispersing agent of tissue culture cells. We have found it to be a most rapid and complete dispersing agent for primary fibroblastic cell lines and clearly superior to trypsin. On the other hand, with certain continuous