Collagen type 1 retards tube formation by human microvascular endothelial cells in a fibrin matrix
article
Angiogenesis, or the formation of new microvessels, is often encountered in pathological situations. A fibrinous exudate can often act as a temporary matrix for the ingrowth of these new microvessels. This matrix consists mainly of fibrin, but is mingled with other plasma components and interstitial collagen fibres. In vitro, capillary-like tube formation can be mimicked by exposing human microvascular endothelial cells (hMVECs), seeded on top of a three-dimensional fibrin matrix, to an angiogenic growth factor (e.g. fibroblast growth factor (FGF)-2) and the cytokine tumour necrosis factor (TNF)-α. Plasmin activity is required in this process. We investigated whether the angiogenic potential of hMVECs was altered by the presence of collagen. The addition of type I collagen to fibrin matrices dose-dependently inhibited tube-formation. Tube-formation in these fibrin/collagen matrices by hMVECs required matrix metalloprotease (MMP) activity, as well as plasmin activity. On a pure collagen type I matrix, hMVECs were not able to form tube-like structures in the matrix but formed sprouts. This sprouting required MMP activity and was, in contrast to the tube-like structures in a fibrin matrix, not influenced by hypoxia. These data indicate that the interaction between endothelial cells and different matrix components is of importance for the angiogenic potential of these cells.
Chemicals/CAS: fibrin, 9001-31-4; plasmin, 9001-90-5, 9004-09-5; Collagen Type I; Fibrin, 9001-31-4; Matrix Metalloproteinases, EC 3.4.24.-; Urinary Plasminogen Activator, EC 3.4.21.73
Chemicals/CAS: fibrin, 9001-31-4; plasmin, 9001-90-5, 9004-09-5; Collagen Type I; Fibrin, 9001-31-4; Matrix Metalloproteinases, EC 3.4.24.-; Urinary Plasminogen Activator, EC 3.4.21.73
Topics
TNO Identifier
236857
ISSN
09696970
Source
Angiogenesis, 5(4), pp. 257-265.
Pages
257-265
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