title: Multifunctional Peptide-Amphiphile End-Capped Mesoporous Silica Nanoparticles for Tumor Targeting Drug Delivery.
abstract: A tumor targeting redox-responsive drug delivery system (DDS) with bioactive surface was constructed by immobilizing peptide-based amphiphile C12-CGRKKRRQRRRPPQRGDS (defined as ADDA-TCPP) onto the mesoporous silica nanoparticles (MSNs) as an end-capping nanovalve, which consists of two main segments: a hydrophobic alkyl chain ADDA and a hydrophilic amino acid sequence containing a Tat48-60peptide sequence with a thiol terminal group and an RGDS targeting ligand, via a disulfide linkage for redox-triggered intracellular drug delivery. A series of characterizations confirmed that the nanosystem had been successfully fabricated. The antitumor drug doxorubicin (DOX) was selected as a model drug and efficiently trapped in the pores of MSNs, and an in vitro release experiment demonstrated that the mesopores of the resulting DOX-loaded MSNs (DOX@MSN-ss-ADDA-TCPP) could be sealed tightly with ADDA-TCPP self-assemblies through hydrophobic interactions between the alkyl chains; the resulting DDS exhibited "zero premature release" of DOX in the physical environment. However, a burst drug release was triggered by a high concentration of glutathione (GSH) in simulated cellular cytosol. Moreover, detailed investigations confirmed that incorporation of RGDS peptide facilitated the active targeting delivery of DOX to αvβ3integrin overexpressed tumor cells, and Tat48-60modification on MSNs could enhance intracellular drug delivery, exhibiting an obvious toxicity to tumor cells. The multifunctional nanosystem constructed here can realize the controlled drug release and serve as a platform for designing multifunctional nanocarriers using diversified bioactive peptide-based amphiphile.
authors.affiliation: School of Chemistry and Materials Science, South-Central University for Nationalities , Wuhan, Hubei 430074, China.|Key Laboratory of Biomedical Polymers of Ministry of Education and Department of Chemistry, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Yin-Jia
authors.identifier: http://orcid.org/0000-0001-6445-3138
authors.initials: YJ
authors.lastname: Cheng
authors.affiliation: School of Chemistry and Materials Science, South-Central University for Nationalities , Wuhan, Hubei 430074, China.
authors.forename: Ai-Qing
authors.initials: AQ
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Biomedical Polymers of Ministry of Education and Department of Chemistry, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Jing-Jing
authors.initials: JJ
authors.lastname: Hu
authors.affiliation: Key Laboratory of Biomedical Polymers of Ministry of Education and Department of Chemistry, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Feng
authors.initials: F
authors.lastname: He
authors.affiliation: Key Laboratory of Biomedical Polymers of Ministry of Education and Department of Chemistry, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Zeng
authors.affiliation: Key Laboratory of Biomedical Polymers of Ministry of Education and Department of Chemistry, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Xian-Zheng
authors.identifier: http://orcid.org/0000-0001-6242-6005
authors.initials: XZ
authors.lastname: Zhang
mesh_terms: D004317:Doxorubicin; D004337:Drug Carriers; D016503:Drug Delivery Systems; D065546:Drug Liberation; D053758:Nanoparticles; D010455:Peptides; D016062:Porosity; D012822:Silicon Dioxide
chemical_list: D004337:Drug Carriers; D010455:Peptides; D012822:Silicon Dioxide; D004317:Doxorubicin
keywords: drug release; mesoporous silica nanoparticle; peptide-amphiphile; redox-sensitive; tumor targeting