基于多聚鸟氨酸的海藻酸微囊化肝细胞体内移植治疗肝衰竭大鼠的研究

Research on the Treatment of Liver Failure Rats with Transplantation of Alginate Microencapsulated Hepatocytes In Vivo Based on Poly-ornithine

本研究探讨海藻酸钠-多聚鸟氨酸-海藻酸(A-PLO-A)和海藻酸钡-多聚鸟氨酸-海藻酸(B-PLO-A)两种新型微囊作为细胞移植载体的效果。两种微囊包裹小鼠肝细胞后,植入D-氨基半乳糖腹腔注射法制备的急性肝衰竭模型大鼠体内,观察大鼠死亡率,检测微囊内肝细胞的生长、增殖、代谢的情况,以及能否有效改善肝衰大鼠的肝功能。实验分为A-PLO-A空微囊、B-PLO-A空微囊、移植游离的肝细胞、A-PLO-A微囊化肝细胞、B-PLO-A微囊化肝细胞五组。研究结果表明,单纯的空微囊对肝衰大鼠病情无缓解作用,移植后两个空囊移植组3d死亡率均达到了100%。游离肝细胞组、A-PLO-A微囊化肝细胞组和B-PLO-A微囊化肝细胞组大鼠的ALT、AST、ALB水平均有所恢复,4周时微囊移植组的上述指标均优于游离肝细胞组,说明微囊化肝细胞移植有效缓解了肝脏损伤的程度,治疗效果好于游离肝细胞组。微囊化肝细胞组大鼠的存活率明显高于空囊移植组和游离肝细胞移植组;4周后回收的微囊表面光滑,无细胞包裹,无纤维化。研究结果提示基于多聚鸟氨酸的海藻酸微囊物理稳定性和生物相容性良好,适合作为肝细胞体内移植的载体。

This study aims to explore the effects of alginate-poly ornithine-alginate （A-PLO-A） and barium alginate- poly ornithine-alginate （B-PLO-A） microcapsules as cells carriers during implantation. Mice hepatocytes coated in A- PLO-A and B-PLO-A microcapsules were implanted into rats with acute liver failure caused by intraperitoneal injec- tion of D-galactosamine. The rat survival rate, liver cell growth, proliferation and metabolism within the microcap- sules were investigated, as well as its effect on the improvement of rat acute liver failure. The influence of A-PLO-A- free microcapsules, B-PLO-A-free microcapsules, isolated liver cells, A-PLO-A microcapsule coated and B-PLO-A microcapsule-coated liver cells was studied. It was found that the chemical-free microcapsules showed no positive effect on the rats with liver failures, with a death rate of 100% in both groups 3 days after the implantation. The ALT, AST and ALB levels were all improved in the isolated liver cell group, the A-PLO-A microcapsule-coated and the B-PLO-A microcapsule-coated groups. The survival rate of both microcapsule-coated liver cell groups was signifi- cantly higher than that of the chemical-free microcapsule group and the isolated liver cells group. The microcapsules were retrieved after 4 weeks＇ implantation, which were observed to he smooth with no cells attaching to the surface. No apparent fibrosis was observed. This research demonstrated the physical stability and the biocompatibility of the PLO-based alginate microcapsules and therefore they could be used as liver cell carriers during implantation.