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Journal of Cell Science, Vol 112, Issue 13 2241-2251, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
W Hayen, M Goebeler, S Kumar, R Riessen and V Nehls
Medizinische Klinik; Institut fur Klinische Biochemie und Pathobiochemie der Universitat Wurzburg and Klinik und Poliklinik fur Haut- und Geschlechtskrankheiten, Josef-Schneider-Str. 2, Germany.
The glycosaminoglycan hyaluronan, which supports tumor cell migration and metastasis, interferes with fibrin polymerization and leads to increased fiber size and porosity of fibrin clots. Here we have studied the proportionate effect of fibrin polymerization on hyaluronan-mediated migration of glioblastoma cells. The structural and physical properties of hyaluronan-containing fibrin gels were analyzed by turbidity measurement, laser scanning microscopy, compaction assay, and calculation of pore size by liquid permeation. When fibrin polymerized in the presence of hyaluronan or dextran, the resulting gels strongly stimulated cell migration, and migration significantly correlated with fiber mass-to-length ratios and pore diameters. In contrast, cell migration was not induced by addition of hyaluronan to supernatants of already polymerized gels. Hyaluronan-mediated migration was inhibited in fibrin gels by antibodies to alphav- and beta1integrins and the disintegrin echistatin, but not by antibodies to the hyaluronan receptor CD44 (up to 50 microg/ml). As a control, we show that anti-CD44 (10 microg/ml) inhibited cell migration on a pure hyaluronan matrix using a two-dimensional Boyden chamber system. In contrast to three-dimensional migration, the migration of cells on the surfaces of variably structured fibrin gels was not significantly different, indicating that increased gel permeability (porosity) may account for hyaluronan-mediated migration. We conclude that, in complex three-dimensional substrates, the predominant effect of hyaluronan on cell migration might be indirect and requires modulation of fibrin polymerization.
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