TY - JOUR

T1 - Determination of activated plasma fibronectin using radioactive labelled collagen I

AU - Fenger, M

PY - 1984

Y1 - 1984

N2 - The plasma concentration of biological active fibronectin was assayed by a protein binding assay using 125I-collagen I as ligand and heparin as activator. The standard curve is linear for a fibronectin range of 1.1-11 pmol (0.5-5.0 micrograms) and the coefficient of variation was less than 10%. The active or activable fibronectin was compared to the immunoreactive fibronectin in plasma from patients with various bacterial diseases. Similar concentrations were detected by the two assays suggesting that all the circulating fibronectin was functionally active. The assay was also applied to determine the structure-function relationship of heparin and heparansulphate in activation of fibronectin. Low-sulphated heparansulphate from umbilical cords and heparin-activated fibronectin but the effect was uncorrelated to anticoagulation activity. Only a small fraction of the heparin was actually capable of activating fibronectin. It is concluded that the assay is very convenient to detect biological active fibronectin and to elucidate the structure-function relationship of heparin and heparansulphate in activating fibronectin.

AB - The plasma concentration of biological active fibronectin was assayed by a protein binding assay using 125I-collagen I as ligand and heparin as activator. The standard curve is linear for a fibronectin range of 1.1-11 pmol (0.5-5.0 micrograms) and the coefficient of variation was less than 10%. The active or activable fibronectin was compared to the immunoreactive fibronectin in plasma from patients with various bacterial diseases. Similar concentrations were detected by the two assays suggesting that all the circulating fibronectin was functionally active. The assay was also applied to determine the structure-function relationship of heparin and heparansulphate in activation of fibronectin. Low-sulphated heparansulphate from umbilical cords and heparin-activated fibronectin but the effect was uncorrelated to anticoagulation activity. Only a small fraction of the heparin was actually capable of activating fibronectin. It is concluded that the assay is very convenient to detect biological active fibronectin and to elucidate the structure-function relationship of heparin and heparansulphate in activating fibronectin.

M3 - Journal article

VL - 44

SP - 541

EP - 547

JO - Scandinavian Journal of Clinical & Laboratory Investigation

JF - Scandinavian Journal of Clinical & Laboratory Investigation

SN - 0036-5513

IS - 6

ER -