Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Aili Suo,Junmin Qian,Minghui Xu,Weijun Xu,Yaping Zhang,Yu Yao
Co-delivery of chemotherapeutic drug and small interfering RNA (siRNA) within a single nanovehicle has emerged as a promising combination therapy approach to treating cancers because of their synergistic effect. Nanocarrier delivery systems with low cytotoxicity and high efficiency are needed for such a purpose. In this study, a novel folate-conjugated PEGylated cationic triblock copolymer, poly(acrylhydrazine)- block -poly(3-dimethylaminopropyl methacrylamide)- block -poly(acrylhydrazine) (PAH- b -PDMAPMA- b -PAH), was synthesized and evaluated as a stimuli-sensitive vehicle for the targeted co-delivery of doxorubicin (DOX) and Bcl-2 siRNA into breast cancer MCF-7 cells. The synthetic process of the PEGylated triblock copolymer involved sequential reversible addition-fragmentation chain transfer polymerization, PEGylation and removal of tert -butoxy carbamate protecting groups. Folate-conjugated and/or -unconjugated poly(ethylene glycol) segments were grafted onto PAH- b -PDMAPMA- b -PAH via a reduction-sensitive disulfide linkage. The synthetic polymers were characterized by 1 H NMR and gel permeation chromatography. The PEGylated triblock copolymer could chemically conjugate DOX onto PAH blocks via pH-responsive hydrazone bonds and simultaneously complex negatively charged Bcl-2 siRNA with cationic PDMAPMA blocks through electrostatic interactions at N/P ratios ≥ 32:1 to form multifunctional nanomicelleplexes. The nanomicelleplexes exhibited spherical shape, possessed a positively charged surface with a zeta potential of + 22.5 mV and had a desirable and uniform particle size of 187 nm. In vitro release studies revealed that the nanomicelleplexes could release DOX and Bcl-2 siRNA in a reduction and pH dual-sensitive manner and the payload release was significantly enhanced in a reductive acidic environment mimicking the endosomes/lysosomes of cancer cells compared to under physiology conditions. Furthermore, the release of both DOX and siRNA was found to follow Higuchi kinetic model. Confocal laser scanning microscopy, flow cytometry and MTT analyses confirmed that, compared with folate-undecorated nanomicelleplexes, folate-decorated nanomicelleplexes could more effectively co-deliver DOX and Bcl-2 siRNA into MCF-7 cells and showed a stronger cell-killing effect. The pristine PEGylated triblock copolymer exhibited good cytocompatibility. Moreover, co-delivery of DOX and Bcl-2 siRNA achieved a significant synergistic antitumor efficacy. These findings suggested that the folate-decorated PEGylated cationic triblock copolymer might be a promising vehicle for targeted intracellular co-delivery of DOX and siRNA in MCF-7 cells, representing a potential clinical combination therapy for breast cancer treatment.
研究领域:
药学
·
纳米技术
·
癌症研究
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Acta Biomaterialia
·
2014
·
IF 5.684
Junmin Qian,Minghui Xu,Aili Suo,Weijun Xu,Ting Liu,Xuefeng Liu,Yu Yao,Hongjie Wang
To minimize the side effects and enhance the efficiency of chemotherapy, a novel folate-decorated hydrophilic cationic star-block terpolymer , [poly( l -glutamic acid γ-hydrazide)- b -poly(N,N-dimethylaminopropyl methacrylamide)] 3 - g -poly(ethylene glycol) ((PGAH- b -PDMAPMA) 3 - g -PEG), with disulfide linkages between the PEG and PDMAPMA blocks, was developed for targeted co-delivery of doxorubicin and Bcl-2 small interfering RNA (siRNA) into breast cancer cells. The terpolymer was synthesized by a combination of ring-opening polymerization, reversible addition–fragmentation chain transfer polymerization, PEGylation and hydrazinolysis. The chemical structures of the polymers were confirmed by 1 H-NMR analysis. The terpolymer could conjugate doxorubicin via an acid-labile hydrazone linkage and simultaneously efficiently complex siRNA through electrostatic interaction at N/P ratios of ⩾4:1 to form “two-in-one” nanomicelleplexes, which displayed a spherical shape and had an average size of 101.3 nm. The doxorubicin loading efficiency and content were 61.0 and 13.23%, respectively. The cytotoxicity, drug release profile, targeting ability, cellular uptake and intracellular distribution of the nanomicelleplexes were evaluated in vitro. We found that the release behaviors of doxorubicin and siRNA had a pH/reduction dual dependency. They were released faster under reductive acidic conditions (pH 5.0, glutathione : 10 mM) than under physiological conditions (pH 7.4). The folate-decorated nanomicelleplexes could deliver doxorubicin and Bcl-2 siRNA more efficiently into the same MCF-7 cell and exhibited a higher cytotoxicity than non-targeted nanomicelleplexes. These results indicate that the terpolymer could act as an efficient vehicle for targeted intracellular co-delivery of doxorubicin and therapeutic siRNA in cancer therapy.
研究领域:
药学
·
纳米技术
·
癌症治疗
·
高分子化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2016
·
IF 3.902
Di Wu,Jiebing Yang,Zhen Xing,Haobo Han,Tingting Wang,Aijun Zhang,Yan Yang,Quanshun Li
In this study, the conjugation of phenylboronic acid (PBA) to amine-terminated polyamidoamine (PAMAM) was successfully conducted to prepare a tumor-targeted gene carrier PBA-functionalized PAMAM (PPP) for Bcl-2 siRNA delivery, using a heterobifunctional crosslinker NHS-PEG 5k -Mal. The carrier possessed favorable capacity for siRNA condensation and could protect siRNA from the degradation against RNase and serum. The introduction of PBA could facilitate the cellular uptake and further transfection of Bcl-2 siRNA demonstrated by confocal laser scanning microscopy and flow cytometry. Meanwhile, PPP-mediated transfection of Bcl-2 siRNA could significantly inhibit the expression of Bcl-2 gene at both mRNA and protein levels. Furthermore, owing to the knock-down of Bcl-2, PPP/siRNA could significantly inhibit the cell proliferation by inducing the cell apoptosis, and also enhance the antitumor efficiency of doxorubicin by suppressing the resistance of tumor cells to chemotherapeutics. In conclusion, the PPP-mediated Bcl-2 siRNA delivery could potentially be an effective platform for solving the drug resistance and further achieving the combined chemotherapy and gene therapy in tumor treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2026
·
IF 15
Liao Zixin,Zhong Rui,Li Wan jing,Wong Yee Shan,Liu Jiaxin,Venkatraman Subbu S.,Wang Hong,Cao Ye
Triple-negative breast cancer (TNBC) bone metastasis remains a significant clinical challenge owing to limited drug across the blood - bone marrow barrier as well as the chemotherapy resistance. Overexpression of the anti-apoptosis protein B-cell lymphoma-2 (Bcl-2) and activation of ATP-binding cassette transporter-mediated drug efflux pathway contribute substantially to paclitaxel (PTX) resistance, leading to poor therapeutic outcomes. Herein, we developed a biomimetic bone-targeted nanotherapeutic by integrating neutrophil “hitchhiking” technology with hyaluronic acid (HA)-modified lipid nanoparticles co-loaded with PTX and Bcl-2 small interfering RNA (siRNA) (BP-HLNP@NEs) for the therapy of TNBC bone metastasis. Leveraging neutrophil-mediated bone marrow homing and HA-CD44 receptor-mediated active targeting, BP-HLNP@NEs efficiently traversed the blood-bone marrow barrier, enhanced accumulation within metastatic bone lesions, and reduced off-target toxicity in the liver and spleen. Following cellular internalization, the co-delivered PTX and Bcl-2 siRNA synergistically suppressed tumor growth by silencing Bcl-2 expression, inhibiting the NF-κB/P-glycoprotein resistance pathway, restoring chemosensitivity, and activating caspase-mediated apoptosis. In orthotopic bone metastatic TNBC models, BP-HLNP@NEs markedly inhibited tumor progression, reduced secondary lung metastasis, preserved bone architecture, and elicited antitumor immune responses. Collectively, this biomimetic delivery platform overcomes both biological delivery barriers and chemoresistance, providing a promising therapeutic strategy for the treatment of TNBC bone metastasis. Graphical
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Xiaojun Zhou,Liang Chen,Wei Nie,Weizhong Wang,Ming Qin,Xiumei Mo,Hongsheng Wang,Chuanglong He
The combination of chemotherapy and gene therapy could induce the enhanced therapeutic efficacy in the cancer therapy. To achieve this goal, a new mesoporous silica nanoparticles (MSNs)-based codelivery system was developed for targeted simultaneous delivery of doxorubicin (DOX) and Bcl-2 small interfering RNA (siRNA) into breast cancer cells. The multifunctional MSNs (MSNs-PPPFA) were prepared by modification of polyethylenimine–polylysine copolymers (PEI-PLL) via the disulfide bonds, to which a targeting ligand folate-linked poly(ethylene glycol) (FA-PEG) was conjugated. The multifunctional MSNs-PPPFA nanocarrier has the ability to encapsulate DOX into the mesoporous channels of MSNs, while simultaneously carrying siRNA via electrostatic interaction between cationic MSNs-PPPFA and anionic siRNA. The resulting MSNs-PPPFA nanoparticles were characterized with various techniques. The drug release results reveal that DOX released from DOX-loaded MSNs-PPPFA are both pH- and redox-responsive, and the results of cell viability and hemolysis assays show that the functional nanocarrier has excellent biocompatibility. Importantly, the folate-conjugated MSNs-PPPFA showed significantly enhanced intracellular uptake in the folate receptor overexpressed MDA-MB-231 breast cancer cells than nontargeted counterparts and thus results in more DOX and siRNA being codelivered into the cells. Furthermore, the delivery of Bcl-2 siRNA obviously downregulate the Bcl-2 protein expression, and thus targeted codelivery of DOX and Bcl-2 siRNA by DOX@MSNs-PPPFA/Bcl-2 siRNA in MDA-MB-231 cells could induce remarkable cell apoptosis as indicated by the results of cell viability and cell apoptosis assays. These results indicate that the constructed DOX@MSNs-PPPFA/Bcl-2 siRNA codelivery system is promising for targeted treatment of breast cancer.
研究领域:
纳米技术
·
药学
·
癌症研究
·
分子生物学
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2018
·
IF 5.738
Weitong Sun,Xiaoyan Chen,Chao Xie,Yong Wang,Liteng Lin,Kangshun Zhu,Xintao Shuai
Drug resistance, developed through multiple mechanisms, is a major hindrance to successful chemotherapy of tumor. Combination therapy of chemotherapeutic drugs and siRNA represents an emerging strategy which may improve anticancer effect by synergistic actions. In this study, triblock copolymer of poly(ethylene glycol)-block-poly(l-lysine)-block-poly aspartyl (N-(N′,N′-diisopropylaminoethyl)) (PEG-PLL-PAsp(DIP)) was synthesized for the first time to enable the codelivery of BCL-2 siRNA and DOX. The system is supposed to not only bypass drug efflux but also down-regulate the antiapoptotic gene and consequently confronting against chemoresistance as well. Moreover, the pH responsive ability of the codelivery system can prevent drug leakage during circulation and guarantee swift drug release at tumors. The codelivered siRNA serves to suppress the expression of antiapoptotic BCL-2 and hence sensitize the cancer cells to anticancer drugs and produce improved therapeutic effect. Consequently, the codelivery of BCL-2 siRNA and anticancer drug DOX serves as a promising strategy against drug resistance in chemotherapy.
研究领域:
药学
·
肿瘤学
·
生物医学工程
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）