Abstract
The complexity of the transplantation model in microencapsulated islet transplantation suggests the use of an in vitro model for the analysis of the effect of encapsulation and graft pretreatment on islet immunogenicity. In this study, the mixed lymphocyte islet culture is applied to islets encapsulated in barium alginate beads, showing a significant reduction of the cellular response compared with non-encapsulated islets. Moreover, the effect of low-temperature culture as the immuno modulatory principle is shown on encapsulated and non-encapsulated islets. The data suggest that encapsulation reduces but not totally impedes the immunological interaction between the encapsulated tissue and the surrounding immune cells and that the stimulatory potency of the encapsulated islet may be modified by immuno-altering pretreatment.
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