Objective To study on the morphological characterizations of tumor infiltrating dendritic cells(TIDCs) in human rectum cancer. Methods The distributive and morphological changes of TIDCs were observed by light,electron microscopy and examined with immunohisochemistoy. Results TIDCs mainly appeared in the tumor-surrounding tissues.There were more TIDCs in the earlier stage than in the later stage(P

Objective To study the distributive characteristics of DC and the expressions of E-cadherin and ICAM-1 in muscosal immune mouse model,to discuss the regulative role for E-cadherin and ICAM-1 in the DC migration. Methods By the method of immunohistochemistry staining and light microscopy,we observed the distributive characteristics of DC in muscosal immune mouse model,analysed the expressions of E-cadherin and ICAM-1. Results The DC mainly distributed in mesenteric lymph node(MLN),Peyer's patch(PP),and GUT(stomach,jejunum and ileum) of muscosal immune mouse model.The number of DC was larger in the experiment group than that in control group.The expression of ICAM-1 was higher,but lower of E-cadherin in muscosal immune mouse model.The number and area density of experiment group were greater compared with that of control group.Conclusion The E-cadherin and ICAM-1 may play a critical role in DC migration.

Objective To study the distribution of proteoglycan(PG) in high endothelial venules(HEVs), inquire into regulate role of proteoglycans for lymphocyte homing. Methods With cationic iron colloid solution staining enzyme sequence blocked method, the distribution of different PG in lymphocytes inside the HEVs, endothelial cells and basement membranes were observed under the light microscope and electron microscope. Results The basement membrane of HEVs and the lymphocytes adjacent basement membranes were strongly positive staining, they could be blocked by hyaluronidase, heparinase and chondroitinase. under the electron microscope, the colloid granules were mainly distributed inside or outside the basement membranes and in the traversing or traversed basement membranes lymphocyte membranes. The endothelial cells, the lymphocytes traversing endothelium and the lymphocytes inside the HEVs were negtive staining.Conclusion The PG that distributed in the basement membranes of HEVs and the membranes of lymphocyte traversing basement membranes were mainly heparin sulfate proteoglycan and chondroitin sulfate proteoglycan and hyaluoronic acid, they may play an important role in the homing lymphocytes traversed basement membranes.