MyD88 silent semi-mature DC induced immune tolerance in rat small bowel transplantation model

Objective To study MyD88 silent semi-mature DC (simDC) inducing immune tolerance in rat small bowel transplantation model. Methods All rats were randomly divided into three groups (n=6). Seven days before transplantation of intestine from F344 donors, Wistar recipient rats were injected with simDC (group A) , imDC (group B) and saline ( group C) through the penile dorsal vein respectively.Small bowel transplantation was performed and the survival time of recipients was observed. Serum IL-2 and IFN-γ levels were assayed. Results The survival time of recipients in group A was ( 13.7±1.2) days, which was significantly longer than that in groups B [(8.0±1.0) days,P<0. 05] and C [(6. 0±0. 8) days P<0. 05]. The serum levels of IL-2 and IFN-γ in group A were lower than in groups B and C (P<0. 05). Conclusion Depending on the unique phenotypic and functional features of sem-DC,they can induce the transplantation tolerance and prolong the survival of intestinal allografts after transplantatin. Key words: Dendritic cell; Immune tolerance; MyD88; Intestinal transplantation