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主题:功能性支架介导白介素-10的基因送递显著提高干细胞的体内存活率9 u# k$ j9 @2 j
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说明:原文来源自Molecular theropy,由干细胞之家新闻小组成员deron翻译(转帖请注明)。
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翻译内容:虽然干细胞移植对多种疾病有潜在的疗效,但是目前临床研究尚无令人信服的论证。这可能部分是因为受者的炎性反应导致了移植干细胞的低生存率。在这个体系中我们用两组不同的基因治疗技术来提高大鼠间充质干细胞的附着性。第一组,干细胞用白介素-10(IL-10)转染,导入一个胶原蛋白支架里。第二组,未处理的干细胞与聚合络合了IL-10的质粒一同导入胶原蛋白支架内。(胶原蛋白)支架以手术的方式植入同基因大鼠的背部。最后,植出支架,同时量化细胞的粘附性、IL-10水平和炎性反应。在7天后,所有处理组细胞的统计显示细胞粘附性显著增加,但是经2ug的IL-10多聚物处理的实验组到第21天仍有明显的提升。IL-10的上调有益于细胞的粘附,而细胞的粘附又可以降低促炎因子的表达水平和细胞的凋亡。炎性反应的最初作用是分化巨噬细胞,诱导表型向细胞毒性系发展。提高细胞的存活率可能是干细胞治疗从理论走向临床的重要一步。2 t. K; P3 G" j6 @
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原摘要:While stem cell transplantation could potentially treat a variety of disorders, clinical studies have not yet demonstrated conclusive benefits. This may be partly because transplanted stem cells have low survival rates, potentially due to host inflammation. The system described herein used two different gene therapy techniques to improve retention of rat mesenchymal stem cells. In the first, stem cells were transfected with interleukin-10 (IL-10) before being loaded into a collagen scaffold. In the second, unmodified stem cells were loaded into a collagen scaffold along with polymer-complexed IL-10 plasmids. The scaffolds were surgically implanted into the dorsum of syngeneic rats. At each endpoint, the scaffolds were explanted and cell retention, IL-10 level and inflammatory response were quantified. All treatment groups had statistically significant increases in cell retention after 7 days, but the group treated with 2 μg of IL-10 polyplexes had a significant improvement even at 21 days. This cell retention was associated with increased IL-10 and decreased levels of proinflammatory cytokines and apoptosis. The primary effect on the inflammatory response appeared to be on macrophage differentiation, encouraging the regulatory phenotype over the cytotoxic lineage. Improving cell survival may be an important step toward realization of the therapeutic potential of stem cells.& N2 f* H* q" M, } V
# `8 s- R; K: d7 r原文: Mol Ther. 2011 Jan 25. 链接:http://www.ncbi.nlm.nih.gov/pubm ... 20Cells%20In%20Vivo(求原文)
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6 [% ^4 z9 s9 K, y M) ?有两个地方不确定1.cell retention,个人翻译为细胞粘附,理解是注入的干细胞附着在组织基质上(有点干细胞归巢的味道),不知是否妥帖2.encouraging the regulatory phenotype over the cytotoxic lineage,个人理解的是将巨噬细胞的杀伤性激活,进而发挥吞噬外来异物的作用,是否符合生理学原理
7 B _$ P s) R) @如有不妥,敬请大家斧正~
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