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The role of the CD44 transmembrane and cytoplasmic
domains in co-ordinating adhesive and signalling
events
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The role of the CD44 transmembrane and cytoplasmic domains in coordinating adhesive and signalling events
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CD44 is a widely distributed type I transmembrane glycoprotein and functions as the major hyaluronan receptor on most cell types.
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Although alternative splicing can produce a large number of different isoforms, they all retain the hyaluronan-binding Link-homology region and a common transmembrane and cytoplasmic domain, which are highly conserved between species.
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The past decade has seen an extensive investigation of this receptor owing to its importance in mediating cell-cell and cell-matrix interactions in both normal and disease states.
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Although roles for alternative splicing and variable glycosylation in determining ligand-binding interactions are now well established, the mechanisms by which CD44 integrates structural and signalling events to elicit cellular responses have been less well understood.
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However, there is now increasing evidence that CD44 is assembled in a regulated manner into membrane-cytoskeletal junctional complexes and, through both direct and indirect interactions, serves to focus downstream signal transduction events.
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