Programmable double-unlock nanocomplex self-supplies phenylalanine ammonia-lyase for precise phenylalanine deprivation of tumors  

作　　者：Chunqing Ou Meijia Xiao Xinyue Zheng Xianzhou Huang Suleixin Yang Yingying Leng Xiaowei Liu Xiuqi Liang Linjiang Song Yanjie You Shaohua Yao Changyang Gong 

机构地区：[1]Department of Biotherapy,Cancer Center and State Key Laboratory of Biotherapy,West China Hospital,Sichuan University,Chengdu 610041,China [2]State Key Laboratory of Quality Research in Chinese Medicine,Institute of Chinese Medical Sciences,University of Macao,Avenida da Universidade,Taipa,Macao 999087,China [3]School of Medical and Life Sciences,Chengdu University of Traditional Chinese Medicine,Chengdu 611137,China [4]Department of Gastroenterology,People’s Hospital of Ningxia Hui Autonomous Region,Yinchuan 750002,China

出　　处：《Chinese Chemical Letters》2024年第8期455-459,共5页中国化学快报（英文版）

基　　金：supported by funds of Sichuan Province for Distinguished Young Scholar(No.2021JDJQ0037);the National Natural Science Foundation of China(No.82172094).

摘　　要：Essential amino acids(EAAs)deprivation is a potential antitumor approach because EAAs are critical for tumor growth.To efficiently inhibit tumor growth,continuous deprivation of EAAs is required,how-ever,continuous deprivation without precise control will introduce toxicity to normal cells.Herein,a programmable double-unlock nanocomplex(ROCK)was prepared,which could self-supply phenylalanine ammonia-lyase(PAL)to tumor cells for phenylalanine(Phe)deprivation.ROCK was double-locked in physiological conditions when administered systemically.While ROCK actively targeted to tumor cells by integrinαvβ3/5 and CD44,ROCK was firstly unlocked by cleavage of protease on tumor cell membrane,exposing CendR and R8 to enhance endocytosis.Then,hyaluronic acid was digested by hyaluronidase overexpressed in endo/lysosome of tumor cells,in which ROCK was secondly unlocked,resulting in pro-moting endo/lysosome escape and PAL plasmid(pPAL)release.Released pPAL could sustainably express PAL in host tumor cells until the self-supplied PAL precisely and successfully deprived Phe,thereby block-ing the protein synthesis and killing tumor cells specifically.Overall,our precise Phe deprivation strategy effectively inhibited tumor growth with no observable toxicity to normal cells,providing new insights to efficiently remove intratumoral nutrition for cancer therapy.

关 键 词：Programmable double-unlock Essential amino acids deprivation Phenylalanine ammonia-lyase Self-supply Gene therapy 

分 类 号：R73-36[医药卫生—肿瘤] TB383.1[医药卫生—临床医学]