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首页> 外文期刊>Biomaterials >Deletion of the tissue response against alginate-pll capsules by temporary release of co-encapsulated steroids.
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Deletion of the tissue response against alginate-pll capsules by temporary release of co-encapsulated steroids.

机译:通过暂时释放共包封的类固醇来消除针对藻酸盐-pll胶囊的组织反应。

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摘要

Transplantation of encapsulated living cells is a promising approach for the treatment of a wide variety of diseases. Large-scale application of the technique, however, is hampered by inflammatory responses against the capsules. In the present study, we investigate whether tissue responses against alginate-PLL-alginate capsules can be modulated by co-encapsulation and temporary release of immunomodulating factors such as dexamethasone. Such an approach may be mandatory in order to increase the function and survival of encapsulated tissue since it has been shown that the tissue response can be caused by many, insurmountable factors. In an in vitro assay, we demonstrated an antiproliferative effect of dexamethasone-containing capsules on L929-mouse-fibroblasts. Subsequently, capsules prepared of purified alginate with or without solved dexamethasone were implanted in the peritoneal cavity of rats and retrieved one month later for histological evaluation. Most of the capsules without dexamethasone proved to be overgrown and adherent to the abdominal organs whereas with co-encapsulated dexamethasone the majority of the capsules were found freely floating in the peritoneal cavity without overgrowth. We conclude that co-encapsulation of dexamethasone has a profound effect on fibroblasts and macrophages adherence to immunoisolating capsules.
机译:封装的活细胞的移植是用于治疗多种疾病的有前途的方法。然而,针对胶囊的发炎反应阻碍了该技术的大规模应用。在本研究中,我们调查是否可以通过共包封和暂时释放免疫调节因子(如地塞米松)来调节针对藻酸盐-PLL-藻酸盐胶囊的组织反应。为了增加被包封的组织的功能和存活率,这种方法可能是强制性的,因为已经证明组织反应可能是由许多无法克服的因素引起的。在体外试验中,我们证明了含地塞米松的胶囊对L929小鼠成纤维细胞具有抗增殖作用。随后,将制备的具有或不具有溶解的地塞米松的纯化藻酸盐的胶囊植入大鼠腹膜腔中,并在一个月后取回用于组织学评估。事实证明,大多数不含地塞米松的胶囊都长满了,并附着在腹腔器官上,而与地塞米松共包封的胶囊中,大多数胶囊可自由漂浮在腹膜腔内而不会过度生长。我们得出的结论是,地塞米松的共封装对成纤维细胞和巨噬细胞对免疫隔离胶囊的粘附具有深远的影响。

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