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Institute
- Klinik und Poliklinik für Dermatologie, Venerologie und Allergologie (201) (remove)
Sonstige beteiligte Institutionen
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- 277775 (2)
The extracellular matrix within connective tissues represents a structural scaffold as well as a barrier for motile cells, such as invading tumor cells or passenger leukocytes. It remains unclear how different cell types utilize matrix-degrading enzymes for proteolytic migration strategies and, on the other hand, non-proteolytic strategies to overcome 3D fibrillar matrix networks. To monitor cell migration, a 3D collagen model in vitro or the mouse dermis in vivo were used, in combination with time-lapse video-, confocal- or intravital multiphoton-microscopy, and computer-assisted cell tracking. Expression of proteases, including several MMPs, ADAMs, serine proteases and cathepsins, was shown by flow cytometry, Western blot, zymography, and RT-PCR. Protease activity by migrating HT-1080 fibrosarcoma cells resulting in collagenolysis in situ and generation of tube-like matrix defects was detected by three newly developed techniques:(i) quantitative FITC-release from FITC-labelled collagen, (ii) structural alteration of the pyhsical matrix structure (macroscopically and microscopically), and (iii) the visualization of focal in situ cleavage of individual collagen fibers. The results show that highly invasive ollagenolytic cells utilized a spindle-shaped "mesenchymal" migration strategy, which involved beta1 integrindependent interaction with fibers, coclustering of beta1 integrins and matrix metalloproteinases (MMPs) at fiber bundling sites, and the proteolytic generation of a tube-like matrix-defect by MMPs and additional proteases. In contrast to tumor cells, activated T cells migrated through the collagen fiber network by flexible "amoeboid" crawling including a roundish, elliptoid shape and morphological adaptation along collagen fibers, which was independent of collagenase function and fiber degradation. Abrogation of collagenolysis in tumor cells was achieved by a cocktail of broad-spectrum protease inhibitors at non-toxic conditions blocking collagenolysis by up to 95%. While in T cells protease inhibition induced neither morphodynamic changes nor reduced migration rates, in tumor cells a time-dependent conversion was obtained from proteolytic mesenchymal to non-proteolytic amoeboid migration in collagen lattices in vitro as well as the mouse dermis in vivo monitored by intravital microscopy. Tumor cells vigorously squeezed through matrix gaps and formed constriction rings in regions of narrow space, while the matrix structure remained intact. MMPs were excluded from fiber binding sites and beta1 integrin distribution was non-clustered linear. Besides for fibrosarcoma cells, this mesenchymal-toameboid transition (MAT) was confirmed for epithelial MDA-MB-231 breast carcinoma cells. In conclusion, cells of different origin exhibit significant diversity as well as plasticity of protease function in migration. In tumor cells, MAT could respresent a functionally important cellular and molecular escape pathway in tumor invasion and migration.