Biomaterials:PVPON/TA胰岛包封可抑制排斥反应并保护胰岛的功能

2017-08-21 MedSci MedSci原创

1型糖尿病(T1D)是一种由参与胰腺β细胞裂解的胰岛浸润性白细胞组成的慢性促炎性自身免疫性疾病。胰岛移植是治疗T1D的一个比较好的方法,但是可获得的胰岛十分有限,而且免疫抑制剂副作用多,移植物的存活率也低,因此临床应用受到限制。研究发现胰岛包封可提供免疫保护屏障,以保护胰岛功能并防止移植后免疫介导的排斥反应。本课题既往研究已经证明,使用单宁酸(TA),免疫调节抗氧化剂和聚(N-乙烯基吡咯烷酮)(P

1型糖尿病(T1D)是一种由参与胰腺β细胞裂解的胰岛浸润性白细胞组成的慢性促炎性自身免疫性疾病。胰岛移植是治疗T1D的一个比较好的方法,但是可获得的胰岛十分有限,而且免疫抑制剂副作用多,移植物的存活率也低,因此临床应用受到限制。研究发现胰岛包封可提供免疫保护屏障,以保护胰岛功能并防止移植后免疫介导的排斥反应。

本课题既往研究已经证明,使用单宁酸(TA),免疫调节抗氧化剂和聚(N-乙烯基吡咯烷酮)(PVPON)组成的胰岛封装的新型细胞保护纳米多层涂层可以有效抑制移植排斥,并保存体外免疫应答体外胰岛功能。然而,(PVPON/TA)维持体内胰岛功能和逆转糖尿病的能力尚未测试。最近证据表明,氧化还原状态的调节可以影响促炎免疫反应。

因此,本研究假设移植(PVPON/TA)封装的胰岛可以恢复糖尿病小鼠的正常血糖并提供免疫保护屏障。结果表明(PVPON/TA)纳米紫外线涂层可以在体外显著降低趋化因子合成和致糖尿病T细胞迁移。重要的是,(PVPON / TA)封装的胰岛在移植到糖尿病小鼠后恢复了正常血糖。

总之,该研究结果表明,(PVPON/TA)封装的胰岛可以抑制T1D患者的免疫应答并增强胰岛同种异体移植物的接受。

原始出处:

Dana Pham-Hua, Lindsey E. Padgett, et al., Islet encapsulation with polyphenol coatings decreases pro-inflammatory chemokine synthesis and T cell trafficking. Biomaterials. 2017 Jun; 128: 19–32.

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    2018-08-07 sunylz
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    2018-08-07 仁心济世
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    2017-08-21 天涯183

    非常好的文章,学习了,很受益

    0

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之前有研究证明,雌激素有明显改善B细胞功能,降低血糖的作用。因此,近来开始研发GLP-1—雌激素结合物来治疗T2DM,此结合物可以将雌激素特异性的送至表达GLP-1受体的细胞,通过雌激素增加GLP-1对胰岛B细胞的保护作用。最近一篇研究就,比较了GLP-1和GLP-1—雌激素结合物在糖毒性环境中对胰岛B细胞的保护作用。研究中随机选取两组新西兰肥胖(NZO)小鼠,分别给予每日GLP-1和GLP-1—