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Effect of fibronectin therapy and fibronectin deficiency on wound healing: a study in rats.

Rats with standardized 3rd-degree burns of 1% body surface were treated intraperitoneally with different doses of human fibronectin or swine gelatin immediately after injury and on the following days. Controls received bovine albumin or no further treatment. Wound healing was assessed by planimetry (days 0, 2, and 7); additionally, plasma fibronectin was determined (days 3 and 7). On day 3 fibronectin levels were significantly elevated after albumin and the highest dosage of fibronectin (3 X 16 mg) and decreased after gelatin and the lowest dosage of fibronectin (3 X 4 mg). Wound healing was neither affected by albumin nor by human fibronectin, but it was significantly impaired by gelatin-induced lack of fibronectin. The data support the opinion that fibronectin is an essential factor for the post-traumatic clearance of gelatin-like tissue debris via the reticuloendothelial system (RES). Overload by gelatin results in fibronectin deficiency and RES dysfunction with risks of infection and poor wound healing.