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. 1975 Jan;146(1):247–252. doi: 10.1042/bj1460247

Relationship between enhanced turnover of phosphatidylinositol and lymphocyte activation by mitogens.

V C Maino, M J Hayman, M J Crumpton
PMCID: PMC1165294  PMID: 167716

Abstract

1. Various lectins [phaseolus vulgaris phytohaemagglutinin, Glycine max (soy-bean) agglutinin, Triticum vulgaris (wheat-germ) agglutinin and Axinella polyploides agglutinin] and antibodies to pig Ig (immunoglobulin) that are found by pig lymphocytes were assessed in terms of their capacities to stimulate lymphocyte transformation and to enhance phosphatidylinositol turnover. Transformation was measured after 45h of culture by incorporation of [6-(3)H]thymidine into DNA, whereas phosphatidylinositol metabolism was assessed after 1h of cultuis and G. max agglutinins and rabbit antibodies to pig Ig) increased phosphatidylinositol turnover, but non-transforming agents (T. vulgaris and A. polyploides agglutinins and Fab fragments of rabbit antibodies to pig Ig) failed to induce any significant enhancement. Subsequent cross-linkage of the bound, non-transforming Fab fragments with a goat antiserum to rabbit Ig stimulated transformation and phosphatidylinositol turnover. 3. Each transforming agent gave characteristic optimal dose responses that were similar for both phosphatidylinositol turnover and transformation. 4. The results indicate that activation of T- and B-lymphocytes is accompanied by enhanced phosphatidylinositol turnover and that in the case of B-cells this enhancement depends on the cross-linkage of surface receptors. They are consistent with the proposal that turnover represents an essential early step in the transformation process.

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Selected References

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