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Effect of fucoidan during activation of human plasminogen.

Abstract：

:Fucoidan [sulfated poly (L-fucopyranose)] was compared with 6-aminohexanoic acid (6-AH) or CNBr-cleaved fibrinogen (CNBr-Fbg) alone or in combination in enhancing the activation of glutamic plasminogen (Glu-Plg) or lysine plasminogen (Lys-Plg) by two-chain tissue plasminogen activator (t-PA) or LMwt-urokinase or by streptokinase. Fucoidan enhanced the t-PA activation of Glu-Plg or Lys-Plg at Plg concentrations greater than 75nM, while stimulation by CNBr-Fbg of t-PA activation followed saturation kinetics of Michaelis-Menton. During t-PA activation of Glu-Plg, a high degree of synergism was observed between 6-AH and fucoidan while the enhancement by CNBr-Fbg was not influenced by fucoidan and was reversed by 6-AH. Fucoidan alone at higher concentrations was effective in enhancing the activation of Glu-Plg by urokinase while the combination of fucoidan and 6-AH showed additive effect in enhancing the activation of Lys-Plg. The activation of Glu-Plg by streptokinase was reversed by fucoidan in a manner similar to that reported for 6-AH. The results are interpreted to suggest that CNBr-Fbg and 6-AH compete with each other for the same lysine binding sites (LBS) on the Plg molecule while fucoidan acted synergistically with 6-AH in enhancing the t-PA activation of Glu-Plg by a different mechanism. The double reciprocal plot for the interaction of Glu-Plg and urokinase also showed a significantly higher affinity between the two in presence of fucoidan.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Doctor VM,Hill C,Jackson GJ

doi

10.1016/0049-3848(95)00111-4

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

237-47

issue

3

eissn

0049-3848

issn

1879-2472

pii

0049-3848(95)00111-4

journal_volume

79

pub_type

杂志文章

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