Expression of Transforming Growth Factor-β by Human Islets: Impact on Islet Viability and Function

Cell Transplantation

Article

Malak Kotb¹  A. Osama Gaber²  Lillian W. Gaber²  Daniel W. Fraga²  Omaima M. Sabek²  James Henry³ 

[1] Department of Surgery, Division of Transplantation, University of Tennessee, Memphis, TN, USA;Department of Surgery, Methodist Hospital/Cornell University, Physicians Organization, Houston, TX, USA;Environmental Health and Safety, St. Jude Children's Research Hospital, Memphis, TN, USA;

关键词: Human islets;    Ad-TGF-β1;    Viability;    NOD-SCID;   

DOI  :  10.3727/000000007783465217

 received in 2006-12-15, accepted in 2007-05-31,  发布年份 2007

来源: Sage Journals

【 摘 要 】

Transforming growth factor-β1 (TGF-β1) is a pleotropic cytokine that promotes angiogenesis and extracellular matrix protein synthesis in addition to its immunosuppressive effects. The purpose of this study is to identify optimal conditions for in vivo expression of TGF-β1 by human islets to exploit the possible beneficial effects and minimize undesirable side effects. We transduced human islets with adenoviral vectors encoding the active form of Ad-TGF-β1 or Ad-LacZ to test the effects of TGF-β1 gene expression on islet in vivo function following their transplantation into a NOD-SCID mouse model. Islets were transduced with multiplicity of infection (MOI) of 20, 10, 5, and 2.5 per islet cell. At a MOI ranging from 2.5 to 20, expression of TGF-β1 in islet supernatant persisted for 1–2 months and ranged from 153 ± 5 to 2574 ± 1299 pg/ml, respectively. Transduction with the lowest MOI (2.5) did not compromise the in vivo production of human C-peptide. We conclude that TGF-β1 expression in transplanted islets does not compromise viability and that adenoviral transduction with the TGF-β1 gene has a dose-dependent effect, with larger MOIs being deleterious. The data also indicate that in vitro culture system and the in vivo NOD-SCID model could be used successfully to evaluate the nonimmune effects of gene transduction.

【 授权许可】

Unknown   
© 2007 Cognizant Comm. Corp.