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- Title
Fibrinolysis-independent role of plasmin and its activators in the haematopoietic recovery after myeloablation.
- Authors
Tjwa, Marc; Moura, Rute; Moons, Lieve; Plaisance, Stephane; De Mol, Maria; Jansen, Sandra; Dewerchin, Mieke; Verfaillie, Catherine; Carmeliet, Peter
- Abstract
Proteinases have been implicated in the mobilization of haematopoietic progenitor cells (HPCs) from the bone marrow (BM). Here, we report the involvement of the plasminogen (Plg) system in the haematopoietic recovery following chemotherapy. By using gene-deficient mice, we found that plasmin and its activators tPA and uPA play a role in the haematopoietic recovery upon delivery of the cytotoxic agent 5-fluoro-uracil (5-FU). The impaired haematopoietic recovery of Plg-deficient (Plg−/−) mice after 5-FU was not rescued by depletion of fibrinogen, indicating that it was not due to defective fibrinolysis. Instead, loss of Plg impaired breakdown of fibronectin, VCAM-1 and laminin-BM matrix proteins involved in adhesion of HPCs to their BM microenvironment and in transendothelial migration of HPCs. These findings provide novel insights in how plasmin regulates haematopoietic recovery upon cytotoxic myeloablation.
- Subjects
PROTEINASES; PROTEOLYTIC enzymes; FIBRINOLYSIS; PLASMIN; PLASMINOGEN; BONE marrow
- Publication
Journal of Cellular & Molecular Medicine, 2009, Vol 13, Issue 11/12, p4587
- ISSN
1582-1838
- Publication type
Article
- DOI
10.1111/j.1582-4934.2008.00521.x