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The role of the CD44 transmembrane and cytoplasmic domains in coordinating adhesive and signalling events CD44µÄ¿çÄ¤ÇøºÍ°ûÖÊÇøÔÚÅäλճÁ¬ºÍÐźÅתµ¼ÖеÄ×÷Óà CD44 is a widely distributed type I transmembrane glycoprotein and functions as the major hyaluronan receptor on most cell types. CD44µÄÊÇÒ»Öֹ㷺·Ö²¼IÐÍ¿çĤÌǵ°°×ÆäÔÚ´ó¶àÊýϸ°ûÀàÐÍÖеÄÖ÷Òª¹¦ÄÜ×÷Ϊ͸Ã÷ÖÊËáÊÜÌå¡£ 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. ËäȻѡÔñÐÔ¼ô½Ó¾Í¿ÉÒÔÉú²ú³ö´óÁ¿²»Í¬µÄÑÇÐÍ£¬ËüÃǶ¼±£Áô͸Ã÷ÖÊËá½áºÏÁ´Í¬Ô´ÇøºÍÒ»¸ö¹²Í¬µÄ¿çÄ¤ÇøºÍ°ûÖÊÇø£¬ÎïÖÖÖ®¼äÕâÊǸ߶ȱ£Êصġ£ 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. ÔÚ¹ýȥʮÄêÖиÃÊÜÌå±»µÃµ½¹ã·ºÑо¿£¬ÓÉÓÚÆäÖØÒªÐÔÔÚÓÚÔÚÕý³£ºÍ¼²²¡×´Ì¬µ÷½âϸ°û¼äºÍϸ°ûÓë»ùÖʼäµÄÏ໥×÷ÓᣠAlthough 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. ËäȻѡÔñÐÔ¼ô½ÓºÍ¿É±äÌÇ»ù»¯ÔÚÅäÌå½áºÏ·´Ó¦ÖеÄ×÷ÓÃÒÑÖªµÀ£¬µ«ÊÇCD44µÄ½áºÏ½á¹¹ºÍÐźÅתµ¼ÒýÆðϸ°ûµÄ·´Ó¦µÄ»úÀí¶¼²»Ì«Á˽⡣ 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. È»¶ø£¬ÏÖÔÚÔ½À´Ô½¶àµÄÖ¤¾Ý±íÃ÷CD44µÄ×°ÅäÒÔÒ»ÖÖµ÷¿ØÄ£Ê½Ç¶ÈëĤ¹Ç¼Ü¸´ºÏÎ²¢Í¨¹ýÖ±½ÓºÍ¼ä½ÓµÄÏ໥×÷ÓÃΪÏÂÓÎÐźÅתµ¼Öصã·þÎñ¡£ |
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