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Application of anti-CD103 immunotoxin for saving islet allograft in context of transplantation

Chinese Medical Journal 2010年第24期123卷 3644-3651页

作者： ZHANG Lei Gregg A. Hadley Department of General Surgery the Second Affiliated Hospital of Harbin Medical University Harbin Heilongjiang 150086 China Division of transplantation Department of Surgery the Ohio State University Medical Center Columbus OH 43210 USA

Background Previous studies using knockout mice document a key role for the integrin CD103 in promoting organ allograft rejection and graft-versus-host disease. However, a determination of whether blockade of the CD103 pathway represents a viable therapeutic strategy for intervention in these processes has proven problematic due to the lack of reagents that efficiently deplete CD103＋ cells from wild type hosts. To circumvent this problem, in the present study, we invented an anti-CD103 immunotoxin （M290-SAP）. We investigated whether M290-SAP has capacity to eliminate CD103-expressing cells in vivo and protect transplanted islets from destroying by host immune *** Flow cytometry was used to analyze the efficacy of M290-SAP in depleting CD103-expressing cells in *** using allogenic islet transplantation models as well as NOD mice with recent onset type 1 diabetes, the therapeutic efficacy of CD103-expressing cell depletion was *** M290-SAP dramatically reduces the frequency and absolute numbers of CD103-expressing leukocytes in peripheral lymphatic tissues of treated mice. Balb/c islets transplanted into streptozotocin-induced diabetic C57BL/6 mice under single M290-SAP treatment showed an indefinite survival time compared with untreated mice, M290-treated mice and IgG-SAP treated mice （mean survival time, ＞100 days vs. ＜20 days）. C57BL/6 islets transplanted into hyperglycemic NOD mice under single M290-SAP treatment showed a pronounced delay in allograft rejection compared with untreated mice （mean survival time 12-13 days vs. ＜7 days）. Immunological analysis of mice with long-term islet allograft survival revealed an obvious atrophy thymus and severe downregulation of alloimmunity of CD8 subpopulation response to allogenic *** Regardless of the underlying mechanisms, these data document that depletion of CD103-expressing cells represents a viable strategy for therapeutic intervention in islet allograft rejection.

关键词： immunotoxin saporin CD8 T lymphocytes pancreatic islets transplantation thymus

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