Fibronectin is produced by blood vessels in response to injury

doi:10.1084/jem.156.2.646

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Fibronectin is produced by blood vessels in response to injury

RA Clark, JH Quinn, HJ Winn, JM Lanigan, P Dellepella and RB Colvin

During the time of tissue repair that ensues subsequent to tissue injury, blood vessel wall fibronectin increases concomitantly with endothelial proliferation and angiogenesis. However, the source of this blood vessel fibronectin had not been delineated. In this report we have demonstrated that microvascular fibronectin is produced in situ by the proliferating vessels surrounding excisional wounds. This finding was established by extirpating 3 mm of skin from the center of a well- healed rat xenograph on the flanks of immunosuppressed mice, harvesting the injured skin sites at various stages during the healing process, and staining the specimens with reciprocal species-specific anti- fibronectin. The proliferating donor vessels that surrounded the wounded graft had increased fluorescence staining with FITC conjugated mouse anti-rat fibronectin and no staining with rat anti-mouse fibronectin. This finding was taken as direct evidence that the fibronectin was produced in situ by the rat vessels and not derived from circulating mouse plasma.
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