Anchorage and growth regulation in normal and virus-transformed cells

✍ Scribed by Michael Stoker; Charles O'Neill; Susan Berryman; Vivienne Waxman

• Publisher: John Wiley and Sons
• Year: 1968
• Tongue: French
• Weight: 756 KB
• Volume: 3
• Category: Article
• ISSN: 0020-7136
• DOI: 10.1002/ijc.2910030517

✦ Synopsis

Many cell types will grow when attached to a rigid surface but not in suspension, a phenomenon termed " anchorage dependence ". Anchorage dependence can be studied by incorporating solid particles of varying size into gels. It has been found that colonies will form on glass fibrils 500 p in length, but not in the presence of silica fragments smaller than the cells. This shows that the suspending medium is not itself inhibitory, anti confirms the requirement for a rigid surface of adcqunte size.

The state of inhibited cells in suspension culture was examined by dispersing them in a methyl cellulose gel, in vessels lined with agar. In this system aggregation is prevented and the cells may be recovered quantitatively. Normal, as well as transformed, cells increase in size, and a proportion synthetize D N A during the first 24 hours in suspension culture. Growth and DNA synthesis in normal cells then virtually cease, while transformed cells continue to grow into colonies. The stationary normal cells rmiain competent for further growth for at least a week in suspension. When such cells are allowed to attach to a rigid surface in the presence of colchicine, DNAsynthesis occurs and is ,followed by mitosis. These results indicate that suspended cells are blocked betwecw mitosis and the end of the S phase of the cycle.