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. 1991 Nov 1;88(21):9588–9592. doi: 10.1073/pnas.88.21.9588

Quantitative assay for morphogenesis indicates the role of extracellular matrix components and G proteins.

R J Klebe 1, T M Overfelt 1, V L Magnuson 1, B Steffensen 1, D L Chen 1, G Zardeneta 1
PMCID: PMC52763  PMID: 1658786

Abstract

A quantitative assay for morphogenesis is described that involves counting the organizing centers (swirling patterns) formed by many cultured fibroblasts. Organizing centers, which are found in vivo, represent one of the smallest units of morphogenesis. We show that macroscopically visible organizing centers form by the merger of smaller organizing centers. Parallel orientation of cells on plastic substrata requires cell-cell contact, but organizing centers can develop without cell-cell contact on collagen gels. On collagen gels, the orientation of collagen fibers determines the orientation of cells with respect to one another. Although organizing centers resemble fingerprints, we have shown that a stochastic process determines the spatial orientation of organizing centers. Treatment of transformed cell lines with agents that increase cAMP levels or alter the activity of guanine nucleotide binding proteins resulted in the generation of organizing centers. Cholesterol precursors involved in protein isoprenylation were found to be potent reverse-transformation agents that could alter the two-dimensional morphogenesis of cells. The simple assay described should permit the analysis of morphogenesis at the molecular and cellular levels.

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