果胶/聚乙烯醇复合水凝胶的生物相容性评价

目的 评价新型人工髓核材料-果胶/聚乙烯醇复合(CoPP)水凝胶的生物相容性.方法 选用NCTC L929小鼠成纤维细胞进行体外急性细胞毒性试验,分为正常组、阴性对照组(聚乙烯醇,PVA)、实验组(CoPP)、阳性对照组(0.64%苯酚),观察细胞生长状态,于培养2、4、7 d测定OD值、计算相对增殖率(RGR).在SD大鼠左、右臀肌内分别植入脱水的CoPP、PVA水凝胶,观察手术切口及一般情况,于术后1、4、12周取材,观察大体标本及其周围炎性细胞、纤维包囊.结果 CoPP组细胞生长良好,RGR均大于75%,PVA组RGR超过80%.细胞毒性小于1级;阳性对照组RGR小于24%、细胞毒性为4～5级.在植入1周时,PVA、CoPP组局部组织的炎性细胞反应为Ⅳ级、未形成完整囊腔:在植入4周时,炎性细胞反应为Ⅰ级、囊腔反应为Ⅳ级;在植入12周时,炎性细胞及囊腔反应均为Ⅰ级.结论 CoPP水凝胶的细胞毒性为0～1级,体内局部组织反应轻,生物相容性良好.

Evaluation of the biocompatibility of pectin/poly vinyl alcohol composite hydrogel as a prosthetic nucleus pulposus material

OBJECTIVE: To evaluate the biocompatibility of pectin/poly vinyl alcohol composite (CoPP) hydrogel for use as a prosthetic nucleus pulposus material. METHODS: The in vitro cytotoxicity of CoPP hydrogel was tested in NCTC L929 cells, which were divided into normal control group, negative control group treated with poly (vinyl alcohol) hydrogel, PVA], experimental group (treated with CoPP) and positive control group (0.64% phenol). The optical density of the cells on days 2, 4, and 7 of the corresponding treatments was determined and the relative growth rate calculated. For in vivo biocompatibility evaluation, dehydrated CoPP and PVA hydrogel were respectively implanted into the left and right gluteus of SD rats, and the wound healing and general status were observed. The muscular tissues containing the implants were taken 1, 4, and 12 weeks after the implantation for gross observation and microscopic observation of the inflammatory cell infiltration (ICI) and formation of the fibrous capsulation around the implants. RESULTS: The L929 cells incubated with PVA and CoPP group both grew well, with relative growth rate over 80% and 75%, respectively. The cytotoxicity of PVA and CoPP was both lower than grade 1. In contrast, the relative growth rate in the positive control group was below 24%, with cytotoxicity over grade 4. In the SD rats, ICI of grade IV occurred in the muscular tissues around the PVA and CoPP implants at 1 week without formation of complete capsule, and at 4 weeks, ICI was lowered to grade 1 with grade 4 capsular reaction. Till week 12, the ICI and capsular reaction were both first grade. CONCLUSION: CoPP hydrogel has in vitro grade 0 or 1 cytotoxicity and causes only mild inflammation after implantation in rats, suggesting good biocompatibility of the material.