Biodegradable implants based on photo-cross-linked aliphatic polycarbonates for long-acting contraception  

作　　者：Zhipeng Hou Wei Xu Siwen Chen Jing Guo Peng Li Jianshe Hu Liqun Yang Jing Chen 

机构地区：[1]Center for Molecular Science and Engineering,College of Science,Northeastern University,Shenyang 110819,China [2]NHC Key Laboratory of Reproductive Health and Medical Genetics (China Medical University),Liaoning Research Institute of Family Planning (The Reproductive Hospital of China Medical University),Shenyang 110031,China [3]Department of Biomaterials,Shengjing Hospital of China Medical University,Shenyang 110004,China [4]Department of Obstetrics and Gynecology,Shengjing Hospital of China Medical University,Shenyang 110004,China

出　　处：《Journal of Materials Science & Technology》2023年第25期129-141,共13页材料科学技术（英文版）

基　　金：sponsored by the Natural Science Foundation of Liaoning Province(Nos.2022-YGJC-69,2021-BS-110);the support program for excellent young scholars of China Medical University.

摘　　要：In this study,a new class of biodegradable contraceptive implants was prepared via the UV irradiation molding method,among which,progestin levonorgestrel(LNG)was used as a model drug.Photo-cross-linked aliphatic polycarbonates(APCs),namely,poly(trimethylene carbonate-co-2,2′-dimethyltrimethylene carbonate)[P(TMC-co-DTC)]elastomers,were used as the drug delivery matrix.The results obtained from the degradation experiments carried out in Sprague-Dawley(SD)rats showed that the cross-linked elastomer had the degradation characteristics of the surface erosion degradation mechanism,with no generation of acid degradation products,and excellent form-stability,which met the performance requirements of the matrix for a long-acting sustained-release delivery system.The in vitro cytotoxicity tests and histological and immunohistochemical evaluations showed good biocompatibility and biosafety of the elastomer matrix material and contraceptive implants.Subsequently,the implant formulations were screened by in vitro release experiments,and their release kinetics were explored.Finally,in the evaluation study of the in vivo anti-fertility effect,the implants exhibited excellent dimensional stability and were degraded by a surface erosion mechanism.LNG achieved a stable and sustained release in female SD rats,maintaining a long-acting contraceptive duration of up to 4 months.The contraceptive implants obtained in this study could be used to address the limitations of currently available formulations,which required secondary surgical removal and a single means of regulating drug release kinetics.Therefore,these implants could provide a new option for birth control needs and may be of significance in reducing the incidence of induced abortion and protecting female fertility.

关 键 词：Aliphatic polycarbonates Photo-cross-linked LEVONORGESTREL Contraceptive implants Anti-fertility effects SUSTAINED-RELEASE 

分 类 号：R318.08[医药卫生—生物医学工程]