Herein,we designed a dual-response shape transformation and charge reversal strategy with chemo-photodynamic therapy to improve the blood circulation time,tumor penetration and retention,which finally enhanced the anti-tumor effect.In the system,hydrophobic photosensitizer chlorin e6(Ce6),hydrophilic chemotherapeutic drug berberrubine(BBR)and matrix metalloproteinase-2(MMP-2)response peptide(PLGVRKLVFF)were coupled by linkers to form a linear triblock molecule BBR-PLGVRKLVFF-Ce6(BPC),which can self-assemble into nanoparticles.Then,positively charged BPC and polyethylene glycol-histidine(PEG-His)were mixed to form PEG-His@BPC with negative sur-face charge and long blood circulation time.Due to the acidic tumor microenvironment,the PEG shell was detached from PEG-His@BPC attributing to protonation of the histidine,which achieved charge reversal,size reduction and enhanced tumor penetration.At the same time,enzyme cutting site was exposed,and the spherical nanoparticles could transform into nanofibers following the enzymolysis by MMP-2,while BBR was released to kill tumors by inducing apoptosis.Compared with original nanopar-ticles,the nanofibers with photosensitizer Ce6 retained within tumor site for a longer time.Collectively,we provided a good example to fully use the intrinsic properties of different drugs and linkers to construct tumor microenvironment-responsive charge reversal and shape transformable nanoparticles with syner-gistic antitumor effect.

Wenfeng Jia;Rui Liu;Yushan Wang;Chuan Hu;Wenqi Yu;Yang Zhou;Ling Wang;Mengjiao Zhang;Huile Gao;Xiang Gao

Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry,Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology,West China School of Pharmacy,Sichuan University,Chengdu 610064,China;Department of Neurosurgery and Institute of Neurosurgery,State Key Laboratory of Biotherapy,West China Hospital,West China Medical School,Sichuan University and Collaborative Innovation Center for Biotherapy,Chengdu 610041,China

药学学报（英文版）

[1]Wenfeng Jia;Rui Liu;Yushan Wang;Chuan Hu;Wenqi Yu;Yang Zhou;Ling Wang;Mengjiao Zhang;Huile Gao;Xiang Gao-.Dual-responsive nanoparticles with transformable shape and reversible charge for amplified chemo-photodynamic therapy of breast cancer)[J].药学学报（英文版）,2022(08):3354-3366

berberrubine,PLGVRKLVFF,triblock

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