【摘要】 目的研究透明质酸(HA)在单核细胞中的分布,HA受体CD44和细胞间黏附分子-1(ICAM-1)在单核细胞中的表达以及HA及其受体对单核细胞黏附和迁移的影响。方法用Percoll非连续密度梯度离心法分离狗外周血单核细胞,然后用免疫荧光染色法标记单核细胞的HA、CD44和ICAM-1。通过用透明质酸酶(HAase)消化细胞表面的HA、在培养皿底面和细胞培养池膜上涂布HA和在培养液中添加HA,观察细胞表面的HA、底物HA和游离HA对细胞黏附和迁移的影响。以抗体阻断剂抑制CD44或ICAM-1,研究HA受体的介导作用。结果单核细胞表面和细胞内存在HA,并表达CD44和ICAM-1。消化细胞表面HA后,黏附和迁移的单核细胞数减少。在培养皿底面和细胞培养池膜上铺HA,黏附和迁移的细胞数增加。培养液中加入HA,黏附和迁移的细胞数减少。阻断CD44后,HA底物上黏附和迁移的细胞数减少,而阻断ICAM-1后黏附和迁移的单核细胞数无明显变化。结论单核细胞内外分布有HA。单核细胞表面的HA和底物HA促进细胞的黏附和迁移,但游离HA阻碍单核细胞的黏附和迁移。CD44介导HA对单核细胞黏附和迁移的作用。更多还原

【Abstract】 Objective To examine the distribution of HA in monocytes and expression of CD44 and ICAM-1 on the monocytes and effects of HA and HA receptors on adhesion and migration of the monocytes. Methods Canine peripheral blood monocytes were isolated by non-continuous density centrifugation with percoll solution.HA on the cell surface,intracellular HA,CD44 and ICAM-l of the monocytes were labeled with immunofluorescence.Effects of HA on the cell surface,substrate HA and free HA on adhesion and migration of the monocytes were examined by digesting HA on the cell surface with HAase,coating the bottom of the dishes and the membrane of the cell culture inserts with HA and adding HA into the medium.Regulating effects of HA receptors on adhesion and migration of the monocytes were investigated after blockade of the receptors. Results There was HA on the surface and in the cytoplasm of the monocytes.CD44 and ICAM-1 were expressed on the monocytes.The adhered and migrated monocytes decreased after HA on the cell surface was digested with HAase.The numbers of the adhered and migrated monocytes were greater when the cells were incubated on HA-coated dishes and membranes of the cell culture inserts.The adhered and migrated monocytes decreased after HA was added into the medium.When CD44 was blocked with antibody,the adhered and migrated monocytes decreased.There were not significant changes in the numbers of the adhered and migrated monocytes after ICAM-1 was blocked with antibody.Conclusion There is HA on the surface and in the cytoplasm of monocytes.HA on the cell surface is essential for adhesion and migration of the monocytes.HA substrate promotes adhesion and migration of the monocytes,while free HA reduces adhesion and migration of the cells.CD44 mediates HA-induced adhesion and migration of the monocytes.更多还原