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. 1988 Feb;8(2):632–646. doi: 10.1128/mcb.8.2.632

Elevated expression of pp60c-src alters a selective morphogenetic property of epithelial cells in vitro without a mitogenic effect.

S L Warren 1, L M Handel 1, W J Nelson 1
PMCID: PMC363189  PMID: 2451121

Abstract

Madin-Darby canine kidney (MDCK) cells are highly differentiated and have retained the morphogenetic properties necessary to form polarized, multicellular epithelial structures (cysts) in vitro that resemble epithelial tissues in vivo. We introduced the c-src gene into MDCK cells to elevate the level of the plasma membrane-associated cellular tyrosine kinase, pp60c-src, to levels two- to ninefold higher than that expressed in parent MDCK cells. Our results revealed a highly discriminatory biological action of pp60c-src on the morphogenetic properties of MDCK cells. Elevated expression of pp60c-src conferred on MDCK cells the ability to undergo dramatic changes of cell shape that includes the formation of long cell processes (100 to 200 microns), never observed in control MDCK cells. The morphogenesis of multicellular epithelial cysts was altered by elevated levels of pp60c-src and led to predictable distortions of their three-dimensional architecture. However, these cells established morphologically normal cell polarity, formed adhesive epithelial cell-cell contacts indistinguishable from those of control MDCK cells, and exhibited neither focus-forming ability or anchorage-independent growth potential. Finally, we showed that MDCK cells expressing elevated levels of pp60c-src exhibit increased phosphorylation of a more limited number of phosphotyrosine-containing proteins than MDCK cells expressing pp60v-src. We suggest that a natural function of pp60c-src is to regulate the morphogenetic properties which determine the shape of differentiated cells and multicellular structures.

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