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. 1974 Oct 1;63(1):288–294. doi: 10.1083/jcb.63.1.288

CYCLIC AMP MEDIATES THE CONCANAVALIN A AGGLUTINABILITY OF MOUSE FIBROBLASTS

Mark C Willingham 1, Ira Pastan 1
PMCID: PMC2109349  PMID: 4371073

Abstract

We have devised a quantitative way to measure the agglutination of cells which utilizes the size discrimination feature of an automatic particle counter. With this method we have studied the agglutinability by concanavalin A of 3T3 cells, a mutant of 3T3 cells (3T3cAMPtcs) in which cyclic AMP levels fall when the cells are subjected to temperature change or fresh serum, and L929 cells. We find with 3T3cAMPtcs cells that low levels of cyclic AMP correlate with increased agglutinability and that high levels of cyclic AMP correlate with decreased agglutinability. Prior treatment of these cells with a cyclic AMP phosphodiesterase inhibitor or Bt2cAMP blocks the increase in agglutinability induced by temperature change. When 3T3 cells are treated with fresh serum, their agglutinability also increases although to a much smaller extent than with 3T3cAMPtcs cells. Cells change their agglutinability very rapidly. Treatment of L929 cells for 15 min with 1-methyl-3-isobutyl xanthine at 1 mM decreases their agglutinability to the level of normal 3T3 cells. We conclude that in normal and transformed cells the level of cyclic AMP regulates agglutinability.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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