• Chengdu Army General Hospital, PLA Medical Centre of General Surgery, Chengdu 610083;
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Objective  To prepare the immunonanospheres[SC3Ab-HSA(5-Fu)-NS] against human colorectal cancer and evaluate its immunoreactivity and effects on cancer.
Methods  SC3Ab-HSA(5-Fu)-NS was prepared by intermolecular cross-linking the monoclonal antibody SC3Ab with human serum albumin nanospheres containing 5-Fu [HAS(5-Fu)-NS] via new hetero-bifunctional crosslinker SPDP. Condensation test and immunoflurecence were used to evaluate the immunoreactivity, the specific binding of SC3Ab-HSA(5-Fu)-NS with colorectal cancer cell line SW1116 was observed by microscope and electron microscope. The specific cytotoxic effects on target cells were evaluated in vitro by MTT assay. SC3AbHSA(5-Fu)-NS, HSA(5-Fu)-NS and 5-Fu were injected into nude mice bearing human colorectal carcinoma, to study the inhibitory activity of SC3Ab-HSA(5-Fu)-NS in vivo.
Results  The immunoreactivity of SC3Ab-HSA(5-Fu)-NS was well preserved. SC3Ab-HSA(5-Fu)-NS can bind the SW1116 cells specifically. The IC50 value for SC3Ab-HSA(5-Fu)-NS on SW1116 cells was 24.6 μg/ml,which was lower than that of HSA(5-Fu)-NS(345.3 μg/ml) and 5-Fu(325.6 μg/ml). The inhibitory rate of SC3Ab-HSA(5-Fu)-NS on the growth of colorectal cancer xenografts was significantly higher than that of HSA(5-Fu)-NS or 5-Fu(P<0.001).
Conclusion  SC3Ab-HSA(5-Fu)-NS has immunoreactivity and specific active targeting to the colorectal cancer cells. The anticancer ability of SC3Ab-HSA(5-Fu)-NS is significantly higher than that of HSA(5-Fu)-NS and 5-Fu.

Citation: KAN Heping,TIAN Fuzhou,LIU Xiaobo,et al.. PREPARATION AND ANTICANCER EFFECTS OF THE IMMUNONANOSPHERES AGAINST HUMAN COLORECTAL CANCER. CHINESE JOURNAL OF BASES AND CLINICS IN GENERAL SURGERY, 2001, 8(1): 1-4. doi: Copy