Dodd I, Browne MJ, Robinson JH. Identification of the calcium-inducible plasminogen activators secreted by a human diploid fibroblast cell line (MRC-5).
Thromb Res 1985;
40:693-702. [PMID:
4089834 DOI:
10.1016/0049-3848(85)90306-8]
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Abstract
Human embryonic lung fibroblast (MRC5) cells secreted small amounts of plasminogen activators into normal, serum-free harvest medium. Stimulation with calcium led to markedly enhanced levels of activator. The major species of plasminogen activator in the harvest medium of the stimulated cultures resembled u-PA when analysed by sodium dodecyl sulphate polyacrylamide gel electrophoresis followed by fibrin zymography. This activator was partially-purified using controlled-pore glass and Blue Sepharose CL6B. Characterisation by fibrin zymography in the presence of specific antibody, by 3H-DFP labelling and by fibrin-binding ability indicated that the activator was indistinguishable from high molecular weight u-PA. The possible physiological role of the production of relatively large amounts of u-PA by a lung cell capable of producing both u-PA and t-PA is discussed.
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