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Journal of Cell Science, Vol 99, Issue 2 227-235, Copyright © 1991 by Company of Biologists
JOURNAL ARTICLES |
W Knudson and CB Knudson
Department of Biochemistry, Rush-Presbyterian-St Luke's Medical Center, Chicago, Illinois 60612.
In this study, we have examined the capacity of various cell types, which express cell surface hyaluronan receptors, to organize a chondrocyte-like pericellular matrix when given chondrocyte-derived extracellular matrix macromolecules exogenously. The assembly of a pericellular matrix was visualized by a particle exclusion assay. Without the addition of exogenous macromolecular components, none of the cell types studied exhibited significant pericellular matrices extending from their plasma membranes. However, upon the addition of high molecular weight hyaluronan in combination with aggregating cartilage proteoglycan monomers, large pericellular matrices were formed within two hours of incubation. No pericellular matrices were formed if these macromolecular components were added separately at equivalent concentrations or if the components were added in the presence of hyaluronan hexasaccharide, a competitive inhibitor of hyaluronan interaction with cell surface hyaluronan receptors. Fully assembled pericellular matrices could also be displaced by the subsequent addition of hyaluronan hexasaccharides. Nonliving, glutaraldehyde-fixed cells, which retained functional hyaluronan receptors, maintained the capacity to assembly pericellular matrices with exogenous components, in serum-containing or serum-free medium. Cells that were incubated with exogenous matrix macromolecules for 24 h, followed by a chase incubation in medium minus the exogenous macromolecules, continued to maintain the matrix for up to 6 h on live cells and more than 24 h on glutaraldehyde-fixed cells. Cell types that did not express hyaluronan receptors were not capable of organizing such pericellular matrices when incubated with these exogenous components. These findings suggest that cells expressing hyaluronan receptors have a significant capacity to organize their immediate extracellular environment via hyaluronan-hyaluronan receptor interactions. Possible physiological functions for this type of matrix organizing capacity are discussed.
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