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Zhang X, Bai Y, Jiang Y, Wang N, Yang F, Zhan L, Huang C. Homo-FRET enhanced ratiometric fluorescence strategy for exonuclease III activity detection. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:1489-1494. [PMID: 33690735 DOI: 10.1039/d0ay02315a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this work, homo-FRET (Förster resonance energy transfer between the same kind of fluorophores) takes place in a hetero-FRET (FRET between two different fluorophores) system and can effectively improve the energy transfer efficiency. Herein, a novel ratiometric fluorescence method was developed for the detection of nuclease activity. Exonuclease III (Exo III), an enzyme which has a high exodeoxyribonuclease activity for double-stranded DNA (dsDNA) in the 3' to 5' direction, was chosen as a proof of concept of this strategy. In a linear dsDNA template, the occurrence of homo-FRET in two Cy3 donors enables the highly efficient transfer of energy to the Cy5 acceptor. The ratio of fluorescence intensity between Cy3 and Cy5 (FD/FA) increases in an Exo III concentration-dependent manner, which built the foundation of Exo III quantification. This method exhibits a linear range from 0.25 to 8 U mL-1 with a detection limit of 0.17 U mL-1. Importantly, this platform also shows the potential for screening Exo III inhibitors and detecting Exo III activity in complex samples.
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Affiliation(s)
- Xu Zhang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, P. R. China.
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Shi Y, Wang Y, Zhu J, Liu W, Khan MZH, Liu X. Molecularly Imprinting Polymers (MIP) Based on Nitrogen Doped Carbon Dots and MIL-101(Fe) for Doxorubicin Hydrochloride Delivery. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1655. [PMID: 32842523 PMCID: PMC7559160 DOI: 10.3390/nano10091655] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/19/2020] [Accepted: 08/20/2020] [Indexed: 12/16/2022]
Abstract
MIL-based molecularly imprinted polymer (MIP) nanocomposites were successfully synthesized through a simple and versatile stirring auxiliary encapsulation method. MIP as a carrier has been applied to the highly efficient selective recognition and sustained release of doxorubicin hydrochloride (DOX). The adsorption mechanism and release behavior of MIP@DOX in vitro were also discussed. Adsorption studies showed that MIP using DOX as template had specific selectivity to DOX, and its optimal drug loading efficiency reached 97.99%. The adsorption isotherm accorded with Freundlich models. The cumulative release curve showed that at the conditions of pH 5.5 and 7.4, the nanomaterials have a slow-release effect on the release of DOX. In addition, the cytotoxicity and bioactivity of MIP nanoparticles on HepG2 and HL-7702 cell lines measured by MTT assay also proved their low toxicity and biological activity. The cell activity of HepG2 and HL-7702 incubated with MIP for 24 h was 69.9% and 76.07%, respectively. These results collectively illustrated that the MIP nano-materials synthesized in this study can be efficiently employed to the drug delivery systems.
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Affiliation(s)
- Yuqiong Shi
- Henan International Joint Laboratory of Medicinal Plants Utilization, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Yuxuan Wang
- Henan International Joint Laboratory of Medicinal Plants Utilization, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Jinhua Zhu
- Henan International Joint Laboratory of Medicinal Plants Utilization, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Wei Liu
- Henan International Joint Laboratory of Medicinal Plants Utilization, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
| | - Md Zaved H Khan
- Department of Chemical Engineering, Jessore University of Science and Technology, Jessore 7408, Bangladesh
| | - Xiuhua Liu
- Henan International Joint Laboratory of Medicinal Plants Utilization, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
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Wang HY, Cao PP, He ZY, He XW, Li WY, Li YH, Zhang YK. Targeted imaging and targeted therapy of breast cancer cells via fluorescent double template-imprinted polymer coated silicon nanoparticles by an epitope approach. NANOSCALE 2019; 11:17018-17030. [PMID: 31502627 DOI: 10.1039/c9nr04655k] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Targeting is vital for precise positioning and efficient therapy, and integrated platforms for diagnosis and therapy have attracted more and more attention. Herein, we established dual-template molecularly imprinted polymer (MIP) coated fluorescent silicon nanoparticles (Si NPs) by using the linear peptide of the extracellular region of human epidermal growth factor receptor-2 (HER2) and adopting doxorubicin (DOX) as templates for targeted imaging and targeted therapy. Benefiting from the epitope imprinting approach, the imprinted sites generated by peptides on the MIP surface can be employed for recognizing the corresponding protein, which allowed the MIP to specifically and actively target HER2-positive breast cancer cells. Because of its ability to identify breast cancer cells, the MIP was applied for targeted fluorescence imaging by taking advantage of the excellent fluorescence properties of Si NPs, and the DOX-loaded MIP (MIP@DOX) can act as a therapeutic probe to effectively target and kill breast cancer cells. In fluorescence images, the targeting of the MIP promoted more uptake of the nanoparticles by cells than the non-imprinted polymer (NIP), so HER2-positive breast cancer cells incubated with the MIP exhibited stronger fluorescence, and there was no significant difference in fluorescence when HER2-negative cells and normal cells were respectively hatched with the MIP and NIP. Importantly, the cell viability was evaluated to demonstrate targeted accumulation and therapy of MIP@DOX for breast cancer cells. The nanoplatform for diagnosis and therapy combined the high sensitivity of fluorescence with the high selectivity of the molecular imprinting technique, which holds vital potential in targeted imaging and targeted therapy in vitro.
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Affiliation(s)
- Hai-Yan Wang
- College of Chemistry, Research Center for Analytical Sciences, State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Nankai University, Tianjin 300071, China.
| | - Pei-Pei Cao
- Key Laboratory of Tumor Microenvironment and Neurovascular Regulation, Nankai University School of Medicine, Tianjin 300071, China.
| | - Zheng-Ying He
- College of Chemistry, Research Center for Analytical Sciences, State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Nankai University, Tianjin 300071, China.
| | - Xi-Wen He
- College of Chemistry, Research Center for Analytical Sciences, State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Nankai University, Tianjin 300071, China.
| | - Wen-You Li
- College of Chemistry, Research Center for Analytical Sciences, State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Nankai University, Tianjin 300071, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
| | - Yu-Hao Li
- Key Laboratory of Tumor Microenvironment and Neurovascular Regulation, Nankai University School of Medicine, Tianjin 300071, China.
| | - Yu-Kui Zhang
- College of Chemistry, Research Center for Analytical Sciences, State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Nankai University, Tianjin 300071, China. and National Chromatographic Research and Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
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