海藻酸钠-壳聚糖-海藻酸钠微囊化PC12细胞脑内移植改善帕金森病模型鼠的旋转行为

背景:细胞组织的微囊化移植是近年来帕金森病治疗的研究热点之一,目前发展较成熟、应用较多的是海藻酸钠-聚赖氨酸-海藻酸钠微胶囊,但其易于囊周纤维化、易破碎等缺点,使其临床应用受到了限制。应用国内研制的新型微胶囊材料海藻酸钠-壳聚糖-海藻酸钠微囊将PC12细胞微囊化后移植入帕金森病模型鼠纹状体内,观察其作用。目的:观察海藻酸钠-壳聚糖-海藻酸钠微囊化PC12细胞脑内移植治疗,改善帕金森病模型大鼠旋转行为的作用。设计:随机对照动物实验。单位:吉林大学第二医院和中国科学院大连化学物理研究所。材料:成年雄性Wistar大鼠40只,体质量(220±10)g;海藻酸钠-壳聚糖-海藻酸钠微囊;PC12细胞。方法:实验于2002-05/12在吉林大学第二医院动物实验室和中国科学院大连化学物理研究所完成。①应用国产新型材料壳聚糖制成的海藻酸钠-壳聚糖-海藻酸钠微囊化PC12细胞。②将成功建立的23只帕金森病大鼠模型随机分为3组,微囊化PC12细胞组10只、裸PC12细胞组7只、空微胶囊组6只。分别将海藻酸钠-壳聚糖-海藻酸钠微囊化PC12细胞、裸PC12细胞、空微胶囊移植入帕金森病模型鼠损伤侧纹状体内。③以阿朴吗啡检测移植前后大鼠旋转行为的差异。观察黑质及纹状体内微包囊的形态并检测微胶囊内细胞的活性。主要观察指标:①移植前后大鼠的旋转行为。②黑质和纹状体的病理形态。③回收的微包囊的完整性及囊内PC12细胞的活性。结果:①微囊化PC12细胞移植组在移植4周时旋转行为显著低于移植前和空微囊移植组犤(6.9±2.8),(11.7±5.5),(10.5±1.6)r/min,P<0.05犦,症状改善至少持续3个月;裸PC12细胞移植组大鼠的旋转行为与移植前相比也有改善犤(5.6±1.1),(9.5±1.5)r/min,P<0.05犦,但仅持续了2个月,且部分大鼠颅内有致死性肿瘤形成。空微囊移植组移植前后大鼠的旋转行为无明显差异。②回收微胶囊内的PC12细胞再培养生长良好,并且具有生物活性。结论:微囊化PC12细胞脑内移植能够改善阿朴吗啡诱发的帕金森病模型鼠的旋转症状,海藻酸钠-壳聚糖-海藻酸钠新型微胶囊具有免疫隔离和抑制肿瘤形成的作用,有着广泛的临床应用前景。

Alginate-chitisan-alginate microencapsulated PC12 cells transplanted into the brain for improving the rotational behavior of the rat model of Parkinson disease

BACKGROUND: The transplantation of microencapsulated cell is becoming a hotspot modality in the therapy of Parkinson disease (PD). The application of Alginate-polysysine-alginate (APA) is currently limited due to fragility and pericystic fibrosis although it has been used in clinic. In this study, the native Alginate-chitosan-alginate(ACA)microencapsulated pheochromocytoma cells (PC12 cells) are transplanted into the region of corpus striatum in the injured side of the brain of the PD rat model, the functional recovery of rotational behavior and pathological changes are also observed in the control, sham and treated groups.OBJECTIVE: To observe whether the transplantation of ACA microencapsulated PC12 cells into the brain can improve the rotational behavior in the rat model of PD.DESIGN: Randomized controlled experiment.SETTING: Dalian Research Institute of Physiochemistry, Chinese Academy of Sciences.MATERIALS: Totally 40 adult male Wistar rats with body mass of(220±10) g, ACA microcapsule and PC12 cells were used in this study.METHODS: The experiment was carried out in the animal experimental laboratory of Second Hospital, Jilin University and Dalian Research Institute of Physicochemistry, Chinese Academy of Sciences between May and December 2002. Native ACA were used to microencapsulate the PC12cells. These rats were randomly divided into the following three groups,treated group (10 rats received microencapsulated PC12 cell transplantation), control group (7 rats received unencapsulated PC12 cell transplantation) and sham group (6 rats received empty microencapsule transplantation). The transplantation site was the region of corpus striatum in the injured side of brain. The difference of rotational behavior included by apomorphine was compared before and after the transplantation in these rats,the morphological changes of the transplanted microcapsules and activity of the microencapsulated cells were also detected.MAIN OUTCOME MEASURES: ①Rotational behavior of the rats before and after transplantation. ②Pathological change in the regions of substantia nigra and corpus striatum. ③ The integrality of retrieved microencapsule and the bioactivity of retrieved PC12 cells.RESULTS: ① At the 4th week of transplantation, rotational behavior was significantly decreased in the encapsulated PC12 cells treated group compared with that of the groups received empty microencapsules transplantation [(6.9±2.8),(10.5±1.6) r/min, P ＜ 0.05].Tbis behavioral improvement could last at least three months. Although the unencapsulated PC12 cells also can improve the rotational behavior compared with before transplantation[(5.6±l.1 ), (9.5±1.5) r/min, P ＜ 0.05], which only lasted two months and fetal tumor formed in the skull of some rats. There was no significant difference in rotational behavior of the rats before and after transplantation in the empty microencapsule transplantation group. PC12 cells of retrieved microencapsulate grew well after re-culture, and have bioactivity.CONCLUSION: Transplantation of ACA microencapsulated PC12 cells into the brain can improve can improve the rotational behavior of rat PD model induced by apomorphine. ACA microcapsule can both isolate the host's immune system effectively and prevent the formation of tumor, and have a promising application in clinic.