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. 1985 Jun;5(6):1425–1433. doi: 10.1128/mcb.5.6.1425

Altered beta-actin gene expression in phorbol myristate acetate-treated chondrocytes and fibroblasts.

L C Gerstenfeld, M H Finer, H Boedtker
PMCID: PMC366873  PMID: 4033660

Abstract

Phorbol-12-myristate-13-acetate (PMA), a potent tumor promoter, was shown to have opposite effects on the cellular morphology and steady-state levels of beta-actin mRNA in embryonic chicken muscle fibroblasts and sternal chondrocytes. When fibroblasts were treated with PMA, they formed foci of densely packed cells, ceased to adhere to culture plates, and had significantly reduced levels of beta-actin mRNA and protein. Conversely, when treated with PMA, floating chondrocytes attached to culture dishes, spread out, and began to accumulate high levels of beta-actin mRNA and proteins. In the sternal chondrocytes the stimulation of the beta-actin mRNA production was accompanied by increased steady-state levels of fibronectin mRNAs and protein. These alterations were concomitant with a fivefold reduction in type II collagen mRNA and a cessation in its protein production. After fibronectin and actin mRNAs and proteins reached their maximal levels, type I collagen mRNA and protein synthesis were turned on. Removal of PMA resulted in reduced beta-actin mRNA levels in chondrocytes and in a further alteration in the cell morphology. These observed correlations between changes in cell adhesion and morphology and beta-actin expression suggest that the effect of PMA on cell shape and adhesion may result in changes in the microfilament organization of the cytoskeleton which ultimately lead to changes in the extracellular matrix produced by the cells.

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Selected References

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