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. 1977 Apr;74(4):1570–1574. doi: 10.1073/pnas.74.4.1570

Generation of macrophage migration inhibitory activity by plasminogen activators.

R O Roblin, M E Hammond, N D Bensky, A M Dvorak, H F Dvorak, P H Black
PMCID: PMC430832  PMID: 193107

Abstract

Medium from cultures of simian virus 40-transformed mouse 3T3 cells (SV3T3) inhibits the migration in vitro of peritoneal exudate cells (macrophages) from guinea pigs while medium from untransformed 3T3 cultures does not [Hammond, M. E., Robbin, R. D., Dvorak, A. M., Selvaggio, S. S., Black, P. H. & Dvorak, H. F. (1974) Science 185, 955-957]. The present paper describes the generation of migration inhibitory factor (MIF)-like activity for peritoneal exudate cells from guinea pigs after incubation of a serum-free harvest fluid from SV3T3 cells with guinea pig serum. Inhibited macrophages lose a densely staining material from the cell surface coat compared with uninhibited guinea pig peritoneal exudate cells. The factor in SV3T3 harvest fluids which generates the migration inhibitory activity appears to be plasminogen activator, i.e., a serine protease, because (i) plasminogen activator activity and the factor which generates MIF-like activity copurify, and co-chromatograph on Sephadex G-200 columns, and (ii) plasminogen activator activity and capacity to generate MIF-like activity are simultaneously lost upon treatment with [3H]diisopropylfluorophosphate. In addition, a purified preparation of a known plasminogen activator, human urokinase, can also generate MIF-like activity upon reaction with guinea pig serum. Because transformation of 3T3 cells by SV40 increases their plasminogen activator secretion, enhanced secretion of plasminogen activator by SV3T3 cells may explain why formation of MIF-like activity is observed in SV3T3 but not 3T3 cultures. These results reveal a biochemical pathway whereby a product secreted by virus-transformed cells affects one function of a cell central to the host's immunological defense system.

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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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