Abstract
The role of the inflammatory agent fibrinogen (Fg) in increased pial venular permeability has been shown previously. It was suggested that an activation of matrix metalloproteinase-9 (MMP-9) is involved in Fg-induced enhanced transcytosis through endothelial cells (ECs). However, direct link between Fg, caveolae formation, and MMP-9 activity has never been shown. We hypothesized that at an elevated level, Fg enhances formation of functional caveolae through activation of MMP-9. Male wild-type (WT, C57BL/6J) or MMP-9 gene knockout (MMP9−/−) mice were infused with Fg (4 mg/ml, final blood concentration) or equal volume of phosphate buffered saline (PBS). After 2 h, mice were sacrificed and brains were collected for immunohistochemical analyses. Mouse brain ECs were treated with 4 mg/ml of Fg or PBS in the presence or absence of MMP-9 activity inhibitor, tissue inhibitor of metalloproteinases-4 (TIMP-4, 12 ng/ml). Formation of functional caveolae was assessed by confocal microscopy. Fg-induced increased formation of caveolae, which was defined by an increased co-localization of caveolin-1 (Cav-1) and plasmalemmal vesicle-associated protein-1 and was associated with an increased phosphorylation of Cav-1, was ameliorated in the presence of TIMP-4. These results suggest that at high levels, Fg enhances formation of functional caveolae that may involve Cav-1 signaling and MMP-9 activation.
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Grant sponsors: Contract grant sponsor: NIH; Contract Grant Numbers: P30 GM-103507 (to DL), NS-084823 (to DL and SCT), HL-071010 (to SCT), and NS-051568 (to SCT).
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Muradashvili, N., Benton, R.L., Tyagi, R. et al. Elevated Level of Fibrinogen Increases Caveolae Formation; Role of Matrix Metalloproteinase-9. Cell Biochem Biophys 69, 283–294 (2014). https://doi.org/10.1007/s12013-013-9797-z
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DOI: https://doi.org/10.1007/s12013-013-9797-z