INTERCELLULAR COMMUNICATION AND TISSUE GROWTH

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Abstract
Intercellular communication was examined in regenerating rat liver and urodele skin, 2 tissues of fast but normal growth. In both, cellular communication is in general as good as in their respective normal intact state; which is in contrast to the lack of cellular communication in tissues with cancerous growth. Upon wounding of the urodele skin, the normally permeable junctional membranes of cells near the wound border seal themselves off, thereby insulating the interiors of the communicated cell systems from the exterior. When the cells of 2 opposing borders make mechanical contact in the course of wound closure, communication between them ensues within 30 min. Within this period, all cell movement also ceases ("contact inhibition"). The possible implications of these findings in the control of tissue growth are discussed.

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