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Endostatin,a C-terminal fragment of collagen 18a,inhibits the growth of established tumorsand metastases in vivo by inhibiting angiogenesis.However,the purification procedures required for large-scale production and the attendant cost of these processes,together with the low effectiveness in clinicaltests,suggest that alternative delivery methods might be required for efficient therapeutic use of endostatin.In the present study,we transfected Chinese hamster ovary(CHO)cells with a human endostatin geneexpression vector and encapsulated the CHO cells in alginate-poly-L-lysine microcapsules.The release ofbiologically active endostatin was confirmed using the chicken chorioallantoic membrane assay.The encap-sulated endostatin-expressing CHO cells can inhibit the growth of primary tumors in a subcutaneous B 16tumor model when injected into the abdominal cavity of mouse.These results widen the clinical applicationof the microencapsulated cell endostatin delivery system in cancer treatment.
Endostatin, a C-terminal fragment of collagen 18a, inhibits the growth of established tumors and metastases in vivo by inhibiting angiogenesis. Host, the purification procedures required for large-scale production and the attendant costs of these processes, together with the low effectiveness in clinicaltests , suggest that alternative delivery methods might be required for efficient therapeutic use of endostatin. In the present study, we transfected Chinese hamster ovary (CHO) cells with a human endostatin gene expression vector and encapsulated the CHO cells in alginate-poly-L-lysine microcapsules The release ofbiologically active endostatin was confirmed by the chicken chorioallantoic membrane assay. The encap-sulated endostatin-expressing CHO cells can inhibit the growth of primary tumors in a subcutaneous B 16 tumor model when injected into the abdominal cavity of mouse. These results widen the clinical applicationof the microencapsulated cell endostatin delivery system in cancer treatment.