Abstract
Previous work has established that macrophages in culture release sulphate from heparin. We now report that increased uptake and desulphation of heparin occurred in the presence of polycations (poly-L-ornithine and poly-DL-lysine) and that the increase in heparin uptake was by about 30-fold. The desulphation was less related to uptake than to the nature of the bound polycation. Serum was found to have an inhibitory effect on heparin uptake while polycations inhibited heparin desulphation by macrophage extracts.
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