Toll-like receptor 2-modulating pectin-polymers in alginate-based microcapsules attenuate immune responses and support islet-xenograft survival

Shuxian Hu*, Rei Kuwabara, Carlos E Navarro Chica, Alexandra M Smink, Taco Koster, Juan D Medina, Bart J de Haan, Martin Beukema, Jonathan R T Lakey, Andrés J García, Paul de Vos

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

36 Citaten (Scopus)
145 Downloads (Pure)


Encapsulation of pancreatic islets in alginate-microcapsules is used to reduce or avoid the application of life-long immunosuppression in preventing rejection. Long-term graft function, however, is limited due to varying degrees of host tissue responses against the capsules. Major graft-longevity limiting responses include inflammatory responses provoked by biomaterials and islet-derived danger-associated molecular patterns (DAMPs). This paper reports on a novel strategy for engineering alginate microcapsules presenting immunomodulatory polymer pectin with varying degrees of methyl-esterification (DM) to reduce these host tissue responses. DM18-pectin/alginate microcapsules show a significant decrease of DAMP-induced Toll-Like Receptor-2 mediated immune activation in vitro, and reduce peri-capsular fibrosis in vivo in mice compared to higher DM-pectin/alginate microcapsules and conventional alginate microcapsules. By testing efficacy of DM18-pectin/alginate microcapsules in vivo, we demonstrate that low-DM pectin support long-term survival of xenotransplanted rat islets in diabetic mice. This study provides a novel strategy to attenuate host responses by creating immunomodulatory capsule surfaces that attenuate activation of specific pro-inflammatory immune receptors locally at the transplantation site.

Originele taal-2English
Pagina's (van-tot)1-13
Aantal pagina's13
Vroegere onlinedatum2020
StatusPublished - jan.-2021

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