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. 1984 Dec 1;99(6):2211–2215. doi: 10.1083/jcb.99.6.2211

Calcium-induced reorganization of desmosomal components in cultured human keratinocytes

PMCID: PMC2113584  PMID: 6209289

Abstract

We used antibodies raised against individual desmosomal components to study calcium-induced desmosome formation in human keratinocytes. When keratinocytes are forced to grow as a monolayer by reducing the level of calcium ions in the culture medium, there is little contact between adjacent cells. Raising the level of calcium ions rapidly induces desmosome formation, and stratification occurs within 24 h. We found that before addition of calcium the 115,000- and 100,000-mol-wt core glycoproteins were distributed over the entire cell surface, whereas the plaque proteins (205,000 and 230,000 mol wt), the 82,000- and 86,000-mol-wt proteins, and the 150,000-mol-wt glycoprotein were located throughout the cytoplasm. 15 min after increasing the calcium ion concentration, all of these molecules appeared at the cell margins. The intensity of peripheral staining increased over the next 2 h and during this time the distribution of keratin filaments changed from predominantly perinuclear to extend throughout the cytoplasm. Keratinocytes could be dissociated with EDTA for up to 2 h after exposure to calcium. After 3 h of exposure to calcium the cells were no longer susceptible to EDTA dissociation and staining for desmosomal plaque antigens persisted in regions of intercellular contact. Desmosomal staining in stratified cultures became greatly reduced within 24 h of lowering the calcium ion concentration again. We have preliminary evidence that stratification occurs by breakdown of desmosomes at lateral surfaces and reformation at surfaces of contact between basal and suprabasal cells, rather than by rearrangement of existing desmosomes. Involucrin-positive cells in the monolayer appeared to contain more 205,000- and 230,000-mol-wt proteins free in the cytoplasm than involucrin-negative cells.

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Selected References

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