Preparation of 131I Labeled Collagen-Chitosan Microspheres and It’s Antitumor Effect on Human Liver Cancer

PANG Fu-wen, CAI Hua-wei, LI Yu-hao. et al

Abstract

To prepare iodine-131 (131 I) labeled biodegradable microspheres with chitosan and collagen for treating liver cancer. Methods Collagen-chitosan microspheres (CCMSs) were prepared with type-I collagen and chitosan using emulsification-chemical cross-linking method. The size of the CCMSs were determined by electron microscope. 1:1 I-CCMSs were achieved using Chloramine-T. The labelling rate of 1311 was recorded. The stability of 131 I-CCMSs in vitro were evaluated in PBS or human blood serum through 192 h incubation. The HepG2 model was established in nude mice 28 d after subcutaneous injection of 106 HepG2 cells. The model mice were sacrificed 7 d after injection of 1:1 I-CCMSs» blank microspheres» or PBS (five mice in each group) into the HepG2 tumor xenografts. Samples of various organs were collected to determine the distribution of 131 I-CCMSs. The curative effect of 131 I-CCMSs on liver cancer was assessed by staining with HE for histological analyses. Results CCMSs were synthesized with a smooth and spherical shape and an average diameter of (5. 1 ± 1. 2) ^m. A radiolabeling rate of 86. 10% was achieved. 1311 radio-loading remained stable; 92.00% in saline and 83.00% in human serum after 192 h incubation. 131 I was mainly concentrated in the subcutaneous tumor tissues. Potent curative effects of 131 I-CCMSs on subcutaneous tumor tissues were demonstrated. Conclusion Biodegradable CCMSs were successfully prepared and radiolabeled. The 131 I-CCMSs exhibited potential curative effects on liver cancer, with high stability in vitro and in vivo.

 

Keywords: Microsphere,  Collagen,  Chitosan,Liver cancer, Radionuclide therapy


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