Expressional regulation of angiopoietin-1 and -2 and the tie-1 and -2 receptor tyrosine kinases during cutaneous wound healing: a comparative study of normal and impaired repair - PubMed (original) (raw)

Comparative Study

Expressional regulation of angiopoietin-1 and -2 and the tie-1 and -2 receptor tyrosine kinases during cutaneous wound healing: a comparative study of normal and impaired repair

H Kämpfer et al. Lab Invest. 2001 Mar.

Free article

Abstract

It has become evident that a closely regulated presence of vascular endothelial growth factor (VEGF) and angiopoietin (Ang) factors determines the fate of blood vessel formation during angiogenesis. As angiogenesis is central to a normal wound-healing process, we investigated the regulation of Ang-1 and -2 and the related tyrosine kinase with immunoglobulin and epidermal growth factor homology (Tie)-1 and -2 receptors during normal repair in Balb/c mice and diabetes-impaired wound healing conditions in genetically diabetic (db/db) mice. For both normal and impaired healing conditions, we observed a constitutive expression of Ang-1, which was paralleled by an increase of Ang-2 upon injury. Whereas the observed Ang-2 expression declines from Day 7 after injury in control mice, diabetic-impaired healing was characterized by still increasing amounts of Ang-2 at these time points. Furthermore, Tie-1 was strongly induced during repair with a prolonged expression in diabetic mice, whereas Tie-2 expression was constitutive during normal repair but completely absent in diabetes-impaired healing. The overexpression of Ang-2 in the presence of markedly reduced VEGF in wounds of diabetic mice was associated with a dramatic decrease in endothelial cell numbers compared with normal healing as assessed by analysis of the endothelium-specific markers CD31 and von Willebrand factor, whereas the lymphatic endothelium remained stable as determined by expression of VEGF receptor-3 (VEGFR-3/Flt-4).

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