The effect of FasL gene transfer to islet cells on pancreatic islet allografts.
OBJECTIVE
To investigate the effect of FasL gene transfer to islet cells on pancreatic islet allografts.


METHODS
A recombinant and replication-deficient type-5 adenovirus encoding murine FasL (AdV- FasL) was constructed by the method of calcium phosphate precipitation. Pancreatic islets were infected with the recombinant adenovirus AdV-FasL, and transplanted into diabetic recipients. FasL expression was detected by RT-PCR and immunohistochemistry. The survival of allografts and the apoptosis of gene transferred islet allografts were analyzed.


RESULTS
All animals receiving islet allograft alone returned to a diabetic state by several days (mean survival time 6.3+/-0.6 days). Compared with the control group, no delayed rejection and prolonged survival of allografts were observed in the group of FasL gene transfer. The rejection was accelerated and the allograft survival was shortened to 3.4+/-0.2 days (P<0.05). Pancreatic islets infected with AdV- FasL demonstrated positive staining of FasL at 24 h, with an increased intensity at 48 h, but not in AdV-5 infected or uninfected islets. TUNEL labeling of pancreatic islet allografts at 24, 48 h revealed apoptosis that was not in AdV-5 infected allografts.


CONCLUSIONS
Though co-transplantation of FasL-expressing testicular cells can induce privilege of islet allografts and prolong allograft survival, direct expression of FasL on islet allografts infected with AdV-FasL may accelerate islets rejection by islet apoptosis and granulocyte infiltration.
Department of Gastrointestinal and Pancreatic Surgery, First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China.
Shi-Rong
SR
Cai
Yu-Long
YL
He
Mei-Jin
MJ
Huang
Jun-Sheng
JS
Peng
Jian-Ping
JP
Wang
Wen-Hua
WH
Zhan
D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D017209:Apoptosis / Q000276:immunology; D053222:Fas Ligand Protein; D015870:Gene Expression; D018014:Gene Transfer Techniques; D006085:Graft Survival / Q000502:physiology*; D007150:Immunohistochemistry; D007515:Islets of Langerhans / Q000276:immunology / Q000473:pathology; D016381:Islets of Langerhans Transplantation / Q000276:immunology* / Q000401:mortality; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics* / Q000276:immunology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014184:Transplantation, Homologous
D053222:Fas Ligand Protein; C505662:Faslg protein, rat; D008562:Membrane Glycoproteins