阿霉素海藻酸钠-壳聚糖微囊治疗兔VX2肢体肉瘤模型的实验研究

目的　研究阿霉素海藻酸钠 壳聚糖微囊对兔VX2肢体肉瘤模型的化疗栓塞作用。方法　 2 4只新西兰大白兔 ,于右大腿肌肉内注射 1× 10 8/mlVX2肿瘤细胞悬液 2ml,建立肢体肉瘤模型。随机分为 4组 ,每组 6只。分别经股动脉给予生理盐水 (A组 )、阿霉素药液 (B组 )、空白海藻酸钠 壳聚糖微囊 (C组 )、阿霉素海藻酸钠 壳聚糖微囊 (D组 )。 3d后对肿瘤标本进行病理组织学检查 ,测定肿瘤坏死面积 ,检测原位末端标记 (TdT mediateddUTPnickendlabelingtechnique ,TUNEL)及增殖细胞核抗原 (proliferatingcellnuclearantigen ,PCNA)。　结果　经股动脉给药微囊栓塞后 ,肿瘤血供明显减少。D组肿瘤广泛坏死 ,PCNA标记率明显降低 ,TUNEL阳性率 6 0 85 %± 5 2 1% ,高于其他 3组 (P <0 0 5 )。　结论　阿霉素海藻酸钠 壳聚糖微囊通过栓塞肿瘤供血动脉 ,局部释放化疗药物 ,可以提高兔VX2肢体肉瘤模型的化疗效果。

Experimental studies on adriamycin alginate-chitosan microcapsules in the treatment of rabbit VX2 carcinoma in the extremity

OBJECTIVE: To study the effects of chemoembolization with adriamycin alginate-chitosan microcapsules in the treatment of VX2 carcinoma in the extremity of the rabbit. METHODS: Twenty-four New Zealand white rabbits transplanted with VX2 carcinoma cells into the muscle tissue of the lower right thigh were divided into four groups namely groups A, B, C and D, and received regional infusion from femoral artery. Each group consisted of six rabbits: a group given natural saline (Group A), a group given adriamycin (Group B), a group given blank alginate-chitosan microcapsules (Group C) and a group given adriamycin alginate-chitosan microcapsules (Group D). Three days after treatment, all groups were examined by histology and immunohistochemical detection (TdT-mediated dUTP nick end labeling technique, TUNEL; proliferating cell nuclear antigen, PCNA). RESULTS: The blood vessels of the tumor were almost embolized by the microcapsules. Extensive necrosis, high level of positive cells in TUNEL (60.85% +/- 5.21%) and low level in PCNA detection with in the tumors were observed in Group D. CONCLUSION: Adriamycin alginate-chitosan microcapsules can potentially play roles in two respects, 1 to serve as embolizing agents, and 2 to serve as drug delivery vehicles for local release. Chemoembolization with microparticals is an effective treatment of malignant osseous and soft tissue sarcomas in an experimental model.