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Three-dimensional invasion of macrophages is mediated by cysteine cathepsins in protrusive podosomesJevnikar, Zala ...Podosomes, specialized actin-rich structures in macrophages, degrade the extracellular matrix (ECM) and are involved in cell migration. On two-dimensional surfaces macrophages form spot-like ... podosomes at the ventral cell surface that develop into protrusive structures in a three-dimensional (3D) environment resembling the ECM. We have shown that the tips of these protrusive podosomes are characterized by increased accumulation of cysteine cathepsins (Cts) B, X, S, H and L, both in human blood macrophages and in human monocytic cell line U-937. Monocyte-to-macrophage differentiation induces an increase in cysteine cathepsin expression and activity, promoting their translocation to the cell surface, where they interact with ECM. This group of proteases is crucial for the extracellular as well as intracellular degradation of ECM, as demonstrated by quantitative monitoring of collagen IV degradation. Furthermore, inhibiting CtsB, X and S significantly impairs macrophage invasion through the 3D matrix. Time-lapse live-cell imaging of CtsB activity revealed that the extracellular and the intracellular ECM degradation are associated with extensive endocytosis at the tip of protrusive podosomes. The targeting of cysteine cathepsins, as the major mediators of human macrophage 3D invasion, could be an approach to the treatment of inflammatory and cancerous diseases.Source: European Journal of Immunology. - ISSN 0014-2980 (Vol. 42, no. 12, 2012, str. 3429-3441)Type of material - e-articlePublish date - 2012Language - englishCOBISS.SI-ID - 3319921
Author
Jevnikar, Zala |
Mirković, Bojana |
Pečar Fonović, Urša |
Zidar, Nace |
Švajger, Urban |
Kos, Janko, 1959-
Topics
makrofagi |
cisteinski katepsini |
podosomi |
celične migracije |
3D matrice
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Jevnikar, Zala | 26497 |
Mirković, Bojana | 29604 |
Pečar Fonović, Urša | 19170 |
Zidar, Nace | 28905 |
Švajger, Urban | 26198 |
Kos, Janko, 1959- | 04648 |
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