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. 1984 Jan;73(1):20–34. doi: 10.1172/JCI111191

Mechanism of acute depletion of plasma fibronectin following thermal injury in rats. Appearance of a gelatinlike ligand in plasma.

D C Deno, M H McCafferty, T M Saba, F A Blumenstock
PMCID: PMC424967  PMID: 6690478

Abstract

Plasma fibronectin was depleted within 15 min following sublethal burn, followed by partial recovery at 8 h and complete restoration by 24 h in anesthetized rats. Radiolabeled 75Se-plasma fibronectin, injected intravenously before burn, was rapidly sequestered in burn skin as well as the liver. Fibronectin levels at 2 h postburn as detected by immunoassay vs. 75Se-plasma fibronectin indicated that more fibronectin was in the plasma than detected by electroimmunoassay. Crossed immunoelectrophoretic analysis of fibronectin in early postburn plasma demonstrated a reduced electrophoretic mobility of the fibronectin antigen. Addition of heparin or fibrin, both of which have affinity for fibronectin, to normal plasma was unable to reproduce this altered fibronectin electrophoretic pattern. In contrast, addition of gelatin or native collagen to normal plasma reproduced the abnormal electrophoretic pattern of fibronectin seen in burn plasma. Extracts of burned skin, but not extracts of normal skin, when added to normal plasma, elicited a similar altered electrophoretic pattern for fibronectin. By gel filtration, fibronectin in burn plasma had an apparent molecular weight approximately 40% greater than that observed in normal plasma. These data suggest the release into the blood of a gelatinlike ligand from burned skin, which complexes with plasma fibronectin. Thus, fibronectin deficiency acutely postburn appears mediated by (a) its accumulation at the site of burn injury; (b) its removal from the circulation by the liver; and (c) its presence in the plasma in a form that is less detectable by immunoassay.

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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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