The effect of simultaneous CD154 AND LFA-1 blockade on the survival of allogeneic islet grafts in nonobese diabetic mice

Thierry Berney, Antonello Pileggi, R. Damaris Molano, Raffaella Poggioli, Elsie Zahr, Camillo Ricordi, Luca Inverardi

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Background. The rate of success in clinical transplantation of islets of Langerhans has dramatically improved with perspectives of wide-scale applicability for patients with type 1 diabetes. One drawback is the need for lifelong immunosuppression, which is associated with significant side effects. Immunomodulatory strategies devoid of side effects and with tolerogenic potential, such as co-stimulatory blockade, would be a great improvement if successful. In this study, the authors have explored the effect of simultaneous blockade of CD40/CD154 and intercellular adhesion molecule (ICAM)/lymphocyte function-associated antigen (LFA)-1 interactions. Methods. Spontaneously diabetic nonobese diabetic (NOD) mice underwent transplantation with allogeneic (C57BL/6) islets and were treated with anti-CD154 monoclonal antibody (mAb) (500 μg, three doses), anti-LFA-1 mAb (100 μg, three doses), or a combination of both in the early peritransplant period. In another set of experiments, LFA-1 engagement was impaired by transplanting islets isolated from ICAM-1-knockout (KO) mice. Results. Untreated animals rejected their grafts within 10 days. LFA-1 blockade alone did not result in improved islet graft survival, whereas CD154 blockade alone increased graft survival to 18 days. Simultaneous blockade of both pathways led to significantly improved islet graft survival to 30 days (ICAM-1-KO islets plus anti-CD154), 35 days (anti-LFA-1 plus anti-CD154), and 44 days (ICAM-1-KO islets plus anti-LFA-1 plus anti-CD154). Conclusions. These data suggest that a synergistic effect for prolonged graft survival can be obtained by simultaneously targeting CD154 and LFA-1 in the challenging model of islet allotransplantation in NOD mice. The observation of similar results with anti-LFA-1 mAb and with ICAM-1-KO grafts suggests a key role of direct antigen presentation for the activation of LFA-1-driven signaling.

Original languageEnglish (US)
Pages (from-to)1669-1674
Number of pages6
JournalTransplantation
Volume76
Issue number12
DOIs
StatePublished - Dec 27 2003

ASJC Scopus subject areas

  • Transplantation

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