ABSTRACT
Objective To evaluate the recognition and uptake of transglutaminase 3 (TG3) by dendritic cell-specific intercellular adhesion molecule 3-grabbing nonintegrin (DC-SIGN) receptors on the membrane surface of DC-SIGN-transfected human embryonic kidney (HEK) 293T cells and monocytederived dendritic cells (MDDCs).Methods The eukaryotic expression vector pGCMV-enhanced green fluorescent protein (EGFP) containing DC-SIGN gene fragments was transfected into HEK293T cells to prepare DC-SIGN-EGFP-HEK293T cells by using liposome transfection method.CD14+ monocytes were isolated from peripheral blood samples by magnetic bead-based negative selection,and then were induced by granulocyte-macrophage colony stimulating factor (GM-CSF) and interleukin-4 (IL-4) to prepare MDDCs.Laser confocal microscopy and flow cytometry were performed to evaluate the recognition and uptake of TG3 protein by DC-SIGN receptors on the surface of HEK293T cells and MDDCs.MDDCs treated without Alexa Fluor 647 dye-tagged TG3 served as blank control group,and those treated with Alexa Fluor 647 dye alone served as negative control group.Results After co-culture with TG3 for 3 hours,laser confocal microscopy and flow cytometry both showed that TG3 could be recognized by and uptaken through DC-SIGN receptors into HEK293T cells and MDDCs.Flow cytometry also revealed that the binding of TG3 to MDDCs could be partially blocked by DC-SIGN blocking antibodies.Neither the negative control group nor the blank control group showed the recognition and binding of TG3 to HEK293T cells and MDDCs.Conclusion TG3 can serve as a kind of autoantigen to be recognized and bound by DC-SIGN receptors,followed by uptake by dendritic cells.
ABSTRACT
Objective To study the expression of TGase3 mRNA in esophageal carcinoma and to investigate it's role and the significance of in the carcinogenesis and progression of esophageal carcinoma.Methods The expression of TGase3 mRNA in 70 ca8es of esophageal carcinoma tissue and 10 cases of normal esophageal tissue were detected by tissue miemarray(TMA)and in situ hybridization(ISH)methods.Results The loss expression rate of TGase3mRNA in esophageal carcinoma tissue was 68.57%(48/70),which was significantly higher than in normal control(P＜0.05).The expression of TGase3 mRNA was no correlation with patients'sex,age,tumor site,lymph node metastasis.But it's significant correlation with clinical stage,histology grade,Pathology grade(P＜0.05).Conclusion There was a high frequency of TGase3 mRNA expression loss in esophageal carcinoma,TGase3 mRNA gene may be involved in carcinogenesis and progression of esophageal carcinoma.