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- Title
A plasma kallikrein-dependent plasminogen cascade required for adipocyte differentiation.
- Authors
Selvarajan, S; Lund, L R; Takeuchi, T; Craik, C S; Werb, Z
- Abstract
Here we show that plasma kallikrein (PKal) mediates a plasminogen (Plg) cascade in adipocyte differentiation. Ecotin, an inhibitor of serine proteases, inhibits cell-shape change, adipocyte-specific gene expression, and lipid accumulation during adipogenesis in culture. Deficiency of Plg, but not of urokinase or tissue-type plasminogen activator, suppresses adipogenesis during differentiation of 3T3-L1 cells and mammary-gland involution. PKal, which is inhibited by ecotin, is required for adipose conversion, Plg activation and 3T3-L1 differentiation. Human plasma lacking PKal does not support differentiation of 3T3-L1 cells. PKal is therefore a physiological regulator that acts in the Plg cascade during adipogenesis. We propose that the Plg cascade fosters adipocyte differentiation by degradation of the fibronectin-rich preadipocyte stromal matrix.
- Publication
Nature cell biology, 2001, Vol 3, Issue 3, p267
- ISSN
1465-7392
- Publication type
Journal Article
- DOI
10.1038/35060059