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Qin J, Zhang M, Guan Y, Guo X, Li Z, Rankl C, Tang J. Imaging and quantifying analysis the binding behavior of PD-L1 at molecular resolution by atomic force microscopy. Anal Chim Acta 2022; 1191:339281. [PMID: 35033247 DOI: 10.1016/j.aca.2021.339281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/20/2021] [Accepted: 11/11/2021] [Indexed: 11/25/2022]
Abstract
Immunotherapy has emerged as an effective treatment modality for cancer. The interaction of programmed cell death ligand-1 (PD-L1) and programmed cell death protein-1 (PD-1) plays a key role in tumor-related immune escape and has become one of the most extensive targets for immunotherapy. Herein, we investigated the interaction of PD-L1 with its antibody and PD-1 using atomic force microscopy-based single molecule force spectroscopy for the first time. It was found that the PD-L1/anti-PD-L1 antibody complex was easier to dissociate than PD-L1/PD-1. The unbinding forces of specific interaction of PD-L1 on T24 cells with its antibody and PD-1 were quantitatively measured and similar to those on substrate. In addition, the location of PD-L1 on T24 cells was mapped at the single-molecule level by force-volume mapping. The force maps revealed that PD-L1 randomly distributed on T24 cells surface. The recognition events on cells obviously increased after INF-γ treatment, which proved that INF-γ up-regulated the expression of PD-L1 on T24 cells. These findings enrich our understanding of the molecular mechanisms by which PD-L1 interacts with its antibody and PD-1. It provides useful information for the physical factors that is needed to be considered in the design of inhibitors for tumor immunology.
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Affiliation(s)
- Juan Qin
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P.R. China; University of Science and Technology of China, Hefei, 230026, P.R. China
| | - Miaomiao Zhang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P.R. China; University of Science and Technology of China, Hefei, 230026, P.R. China
| | - Yanxue Guan
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P.R. China; University of Science and Technology of China, Hefei, 230026, P.R. China
| | - Xinyue Guo
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P.R. China; University of Science and Technology of China, Hefei, 230026, P.R. China
| | - Zongjia Li
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P.R. China; University of Science and Technology of China, Hefei, 230026, P.R. China
| | - Christian Rankl
- Research Center for Non Destructive Testing GmbH, Science Park 2/2. OG, Altenberger Straße 69, A-4040, Linz, Austria
| | - Jilin Tang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P.R. China; University of Science and Technology of China, Hefei, 230026, P.R. China.
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Bartels J, Blüher A, López Castellanos S, Richter M, Günther M, Mascher T. The
Bacillus subtilis
endospore crust: protein interaction network, architecture and glycosylation state of a potential glycoprotein layer. Mol Microbiol 2019; 112:1576-1592. [DOI: 10.1111/mmi.14381] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/02/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Julia Bartels
- Institute of Microbiology Technische Universität (TU) Dresden Dresden 01062Germany
| | - Anja Blüher
- School of Engineering Science Institute of Materials Science Technische Universität (TU) Dresden Dresden 01062Germany
| | | | - Marcus Richter
- Institute of Microbiology Technische Universität (TU) Dresden Dresden 01062Germany
| | - Markus Günther
- Institute of Botany Technische Universität (TU) Dresden Dresden 01062Germany
| | - Thorsten Mascher
- Institute of Microbiology Technische Universität (TU) Dresden Dresden 01062Germany
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Wang N, Zhang M, Chen X, Ma X, Li C, Zhang Z, Tang J. Mapping the interaction sites of Mucin 1 and DNA aptamer by atomic force microscopy. Analyst 2018; 142:3800-3804. [PMID: 28930315 DOI: 10.1039/c7an01119a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Mucin 1 (MUC1) is an attractive tumor marker for cancer diagnosis. An advanced atomic force microscopy (AFM) mode, peak-force tapping AFM with an aptamer functionalized tip, was introduced to map the specific interaction sites of an aptamer and MUC1. Single molecular force spectroscopy (SMFS) was used to investigate dynamic parameters of the aptamer-MUC1.
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Affiliation(s)
- Nan Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
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Physical interaction and assembly of Bacillus subtilis spore coat proteins CotE and CotZ studied by atomic force microscopy. J Struct Biol 2016; 195:245-251. [DOI: 10.1016/j.jsb.2016.06.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 06/12/2016] [Accepted: 06/14/2016] [Indexed: 11/19/2022]
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