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Initial stages of cell-matrix adhesion can be mediated and modulated by cell-surface hyaluronan.
Zimmerman E
,
Geiger B
,
Addadi L
.
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A conceptual temporal and spatial gap exists between the first encounter of a cell with an adhesive substrate and the advanced stages of focal adhesion formation. Although ample information is available on focal adhesions structure and function, the mechanism of the first interaction events and the nature of the molecules mediating them are largely unknown. In this paper we identify cell-surface-associated hyaluronan as a mediator and modulator of the first steps of adhesion of A6 and other cells to conventional tissue culture substrates as well as to the surfaces of calcium-(R,R)-tartrate tetrahydrate crystals. Treatment of A6 cells with hyaluronidase suppresses their rapid interactions with these adhesive substrates, and incubation of either the hyaluronidase-treated cells or the substrate with hyaluronan restores cell adhesion. In contrast, excess hyaluronan on both the cells and the substrate strongly inhibits adhesion. We thus propose that cell-surface-associated hyaluronan can mediate and modulate cell-matrix adhesion at the very first encounter with the substrate. It may promote it through the establishment of exquisitely stereospecific chemical interactions or inhibit it by virtue of steric exclusion and/or electrostatic repulsion.
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