1
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Kim SB, Paulmurugan R, Kitada N, Maki SA. Single-chain multicolor-reporter templates for subcellular localization of molecular events in mammalian cells. RSC Chem Biol 2023; 4:1043-1049. [PMID: 38033721 PMCID: PMC10685814 DOI: 10.1039/d3cb00077j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 09/25/2023] [Indexed: 12/02/2023] Open
Abstract
Single-chain multicolor-reporter imaging templates were developed for the subcellular localization of molecular events in mammalian cells. The templates were constructed by tandem linkage of fluorescent protein variants - fused with luciferases and the subcellular localization signal peptides. The templates simultaneously reported steroid hormonal activities at different optical spectra in the subcellular compartments. The templates contribute to the expansion of a toolbox of optical probes for subcellular localization of molecular events in intact cells.
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Affiliation(s)
- Sung-Bae Kim
- Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 305-8569 Japan
| | - Ramasamy Paulmurugan
- Molecular Imaging Program at Stanford, Bio-X Program, Stanford University School of Medicine Palo Alto California 94304 USA
| | - Nobuo Kitada
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications Chofu 182-8585 Japan
| | - Sojiro A Maki
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications Chofu 182-8585 Japan
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2
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Li Y, Wu J, Jin C, Zhang Y, Wang J, Wang X, Li H, Zhang X, Liu T, Zhou D, Kuang Y, Wu W, Wang Y, Ke Z, Bu X, Yue X. Caged Luciferase Inhibitor-Based Bioluminescence Switching Strategy Enables Efficient Detection of Serum APN Activity and the Identification of Its Roles in Metastasis of Non-Small Cell Lung Cancer. Chemistry 2023; 29:e202300655. [PMID: 37227809 DOI: 10.1002/chem.202300655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/26/2023] [Accepted: 05/24/2023] [Indexed: 05/27/2023]
Abstract
Bioluminogenic probes emerged as powerful tools for imaging and analysis of various bioanalyses, but traditional approaches would be limited to the low sensitivity during determine the low activity of protease in clinical specimens. Herein, we proposed a caged luciferase inhibitor-based bioluminescence-switching strategy (CLIBS) by using a cleavable luciferase inhibitor to modulate the activity of luciferase reporter to amplify the detective signals, which led to the enhancement of detection sensitivity, and enabled the determination of circulating Aminopeptidase N (APN) activity in thousands of times diluted serum. By applying the CLIBS to serum samples in non-small cell lung cancer (NSCLC) patients from two clinical cohorts, we revealed that, for the first time, higher circulating APN activities but not its concentration, were associated with more NSCLC metastasis or higher metastasis stages by subsequent clinical analysis, and can serve as an independent factor for forecasting NSCLC patients' risk of metastasis.
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Affiliation(s)
- Yunzhi Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Jiaxin Wu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Chaoying Jin
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Yiqiu Zhang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Jiyu Wang
- Division of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Sun Yat-sen University, Institute of Respiratory Diseases of Sun Yat-sen University, Guangzhou, 510080, China
| | - Xuecen Wang
- Department of Radiation Oncology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China
| | - Huixia Li
- Division of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Sun Yat-sen University, Institute of Respiratory Diseases of Sun Yat-sen University, Guangzhou, 510080, China
| | - Xiaoyue Zhang
- Department of Radiation Oncology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China
| | - Tingyu Liu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, China
| | - Deyuan Zhou
- Division of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Sun Yat-sen University, Institute of Respiratory Diseases of Sun Yat-sen University, Guangzhou, 510080, China
| | - Yukun Kuang
- Division of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Sun Yat-sen University, Institute of Respiratory Diseases of Sun Yat-sen University, Guangzhou, 510080, China
| | - Weijian Wu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Youqiao Wang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
| | - Zunfu Ke
- Molecular Diagnosis and Gene Test Center, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, China
| | - Xianzhang Bu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China
- State Key Laboratory of Chemical Oncogenomics, Guangdong Provincial Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
| | - Xin Yue
- Department of Radiation Oncology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, China
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3
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Mujawar A, Phadte P, Palkina KA, Markina NM, Mohammad A, Thakur BL, Sarkisyan KS, Balakireva AV, Ray P, Yamplosky I, De A. Triple Reporter Assay: A Non-Overlapping Luciferase Assay for the Measurement of Complex Macromolecular Regulation in Cancer Cells Using a New Mushroom Luciferase-Luciferin Pair. SENSORS (BASEL, SWITZERLAND) 2023; 23:7313. [PMID: 37687774 PMCID: PMC10490530 DOI: 10.3390/s23177313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/14/2023] [Accepted: 08/18/2023] [Indexed: 09/10/2023]
Abstract
This study demonstrates the development of a humanized luciferase imaging reporter based on a recently discovered mushroom luciferase (Luz) from Neonothopanus nambi. In vitro and in vivo assessments showed that human-codon-optimized Luz (hLuz) has significantly higher activity than native Luz in various cancer cell types. The potential of hLuz in non-invasive bioluminescence imaging was demonstrated by human tumor xenografts subcutaneously and by the orthotopic lungs xenograft in immunocompromised mice. Luz enzyme or its unique 3OH-hispidin substrate was found to be non-cross-reacting with commonly used luciferase reporters such as Firefly (FLuc2), Renilla (RLuc), or nano-luciferase (NLuc). Based on this feature, a non-overlapping, multiplex luciferase assay using hLuz was envisioned to surpass the limitation of dual reporter assay. Multiplex reporter functionality was demonstrated by designing a new sensor construct to measure the NF-κB transcriptional activity using hLuz and utilized in conjunction with two available constructs, p53-NLuc and PIK3CA promoter-FLuc2. By expressing these constructs in the A2780 cell line, we unveiled a complex macromolecular regulation of high relevance in ovarian cancer. The assays performed elucidated the direct regulatory action of p53 or NF-κB on the PIK3CA promoter. However, only the multiplexed assessment revealed further complexities as stabilized p53 expression attenuates NF-κB transcriptional activity and thereby indirectly influences its regulation on the PIK3CA gene. Thus, this study suggests the importance of live cell multiplexed measurement of gene regulatory function using more than two luciferases to address more realistic situations in disease biology.
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Affiliation(s)
- Aaiyas Mujawar
- Molecular Functional Imaging Laboratory, Advanced Centre for Treatment, Research and Education in Cancer, Navi Mumbai 410210, India; (A.M.); (A.M.)
- Faculty of Life Science, Homi Bhabha National Institute, Mumbai 400094, India; (P.P.); (B.L.T.); (P.R.)
| | - Pratham Phadte
- Faculty of Life Science, Homi Bhabha National Institute, Mumbai 400094, India; (P.P.); (B.L.T.); (P.R.)
- Imaging Cell Signalling and Therapeutics Laboratory, Advanced Centre for Treatment, Research and Education in Cancer, Navi Mumbai 410210, India
| | - Ksenia A. Palkina
- Institute of Bioorganic Chemistry (IBCh), Russian Academy of Sciences, Moscow 119991, Russia; (K.A.P.); (N.M.M.); (K.S.S.); (A.V.B.)
- Planta LLC, Bolshoi Boulevard, 42 Street 1, Moscow 121205, Russia
| | - Nadezhda M. Markina
- Institute of Bioorganic Chemistry (IBCh), Russian Academy of Sciences, Moscow 119991, Russia; (K.A.P.); (N.M.M.); (K.S.S.); (A.V.B.)
- Planta LLC, Bolshoi Boulevard, 42 Street 1, Moscow 121205, Russia
| | - Ameena Mohammad
- Molecular Functional Imaging Laboratory, Advanced Centre for Treatment, Research and Education in Cancer, Navi Mumbai 410210, India; (A.M.); (A.M.)
| | - Bhushan L. Thakur
- Faculty of Life Science, Homi Bhabha National Institute, Mumbai 400094, India; (P.P.); (B.L.T.); (P.R.)
- Imaging Cell Signalling and Therapeutics Laboratory, Advanced Centre for Treatment, Research and Education in Cancer, Navi Mumbai 410210, India
| | - Karen S. Sarkisyan
- Institute of Bioorganic Chemistry (IBCh), Russian Academy of Sciences, Moscow 119991, Russia; (K.A.P.); (N.M.M.); (K.S.S.); (A.V.B.)
- Synthetic Biology Group, MRC London Institute of Medical Sciences, London W12 0NN, UK
| | - Anastasia V. Balakireva
- Institute of Bioorganic Chemistry (IBCh), Russian Academy of Sciences, Moscow 119991, Russia; (K.A.P.); (N.M.M.); (K.S.S.); (A.V.B.)
- Planta LLC, Bolshoi Boulevard, 42 Street 1, Moscow 121205, Russia
| | - Pritha Ray
- Faculty of Life Science, Homi Bhabha National Institute, Mumbai 400094, India; (P.P.); (B.L.T.); (P.R.)
- Imaging Cell Signalling and Therapeutics Laboratory, Advanced Centre for Treatment, Research and Education in Cancer, Navi Mumbai 410210, India
| | - Ilia Yamplosky
- Institute of Bioorganic Chemistry (IBCh), Russian Academy of Sciences, Moscow 119991, Russia; (K.A.P.); (N.M.M.); (K.S.S.); (A.V.B.)
| | - Abhijit De
- Molecular Functional Imaging Laboratory, Advanced Centre for Treatment, Research and Education in Cancer, Navi Mumbai 410210, India; (A.M.); (A.M.)
- Faculty of Life Science, Homi Bhabha National Institute, Mumbai 400094, India; (P.P.); (B.L.T.); (P.R.)
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Kim SB, Furuta T, Kitada N, Maki SA. Creation of Artificial Luciferase 60s from Sequential Insights and Their Applications to Bioassays. SENSORS (BASEL, SWITZERLAND) 2023; 23:6376. [PMID: 37514669 PMCID: PMC10384629 DOI: 10.3390/s23146376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 07/10/2023] [Accepted: 07/12/2023] [Indexed: 07/30/2023]
Abstract
In this study, a series of new artificial luciferases (ALucs) was created using sequential insights on missing peptide blocks, which were revealed using the alignment of existing ALuc sequences. Through compensating for the missing peptide blocks in the alignment, 10 sibling sequences were artificially fabricated and named from ALuc55 to ALuc68. The phylogenetic analysis showed that the new ALucs formed an independent branch that was genetically isolated from other natural marine luciferases. The new ALucs successfully survived and luminesced with native coelenterazine (nCTZ) and its analogs in living mammalian cells. The results showed that the bioluminescence (BL) intensities of the ALucs were interestingly proportional to the length of the appended peptide blocks. The computational modeling revealed that the appended peptide blocks created a flexible region near the active site, potentially modulating the enzymatic activities. The new ALucs generated various colors with maximally approximately 90 nm redshifted BL spectra in orange upon reaction with the authors' previously reported 1- and 2-series coelenterazine analogs. The utilities of the new ALucs in bioassays were demonstrated through the construction of single-chain molecular strain probes and protein fragment complementation assay (PCA) probes. The success of this study can guide new insights into how we can engineer and functionalize marine luciferases to expand the toolbox of optical readouts for bioassays and molecular imaging.
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Affiliation(s)
- Sung-Bae Kim
- Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, Japan
| | - Tadaomi Furuta
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Nobuo Kitada
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu 182-8585, Japan
| | - Shojiro A Maki
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu 182-8585, Japan
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5
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Bu Q, Li P, Xia Y, Hu D, Li W, Shi D, Song K. Design, Synthesis, and Biomedical Application of Multifunctional Fluorescent Polymer Nanomaterials. Molecules 2023; 28:molecules28093819. [PMID: 37175229 PMCID: PMC10179976 DOI: 10.3390/molecules28093819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 04/24/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023] Open
Abstract
Luminescent polymer nanomaterials not only have the characteristics of various types of luminescent functional materials and a wide range of applications, but also have the characteristics of good biocompatibility and easy functionalization of polymer nanomaterials. They are widely used in biomedical fields such as bioimaging, biosensing, and drug delivery. Designing and constructing new controllable synthesis methods for multifunctional fluorescent polymer nanomaterials with good water solubility and excellent biocompatibility is of great significance. Exploring efficient functionalization methods for luminescent materials is still one of the core issues in the design and development of new fluorescent materials. With this in mind, this review first introduces the structures, properties, and synthetic methods regarding fluorescent polymeric nanomaterials. Then, the functionalization strategies of fluorescent polymer nanomaterials are summarized. In addition, the research progress of multifunctional fluorescent polymer nanomaterials for bioimaging is also discussed. Finally, the synthesis, development, and application fields of fluorescent polymeric nanomaterials, as well as the challenges and opportunities of structure-property correlations, are comprehensively summarized and the corresponding perspectives are well illustrated.
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Affiliation(s)
- Qingpan Bu
- School of Life Science, Changchun Normal University, Changchun 130032, China
| | - Ping Li
- School of Life Science, Changchun Normal University, Changchun 130032, China
| | - Yunfei Xia
- School of Life Science, Changchun Normal University, Changchun 130032, China
| | - Die Hu
- School of Life Science, Changchun Normal University, Changchun 130032, China
| | - Wenjing Li
- School of Education, Changchun Normal University, Changchun 130032, China
| | - Dongfang Shi
- Institute of Science, Technology and Innovation, Changchun Normal University, Changchun 130032, China
| | - Kai Song
- School of Life Science, Changchun Normal University, Changchun 130032, China
- Institute of Science, Technology and Innovation, Changchun Normal University, Changchun 130032, China
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6
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Kim SB, Furuta T, Kamiya G, Kitada N, Paulmurugan R, Maki SA. Bright Molecular Strain Probe Templates for Reporting Protein-Protein Interactions. SENSORS (BASEL, SWITZERLAND) 2023; 23:3498. [PMID: 37050557 PMCID: PMC10098686 DOI: 10.3390/s23073498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/20/2023] [Accepted: 03/22/2023] [Indexed: 06/19/2023]
Abstract
Imaging protein-protein interactions (PPIs) is a hot topic in molecular medicine in the postgenomic sequencing era. In the present study, we report bright and highly sensitive single-chain molecular strain probe templates which embed full-length Renilla luciferase 8.6-535SG (RLuc86SG) or Artificial luciferase 49 (ALuc49) as reporters. These reporters were deployed between FKBP-rapamycin binding domain (FRB) and FK506-binding protein (FKBP) as a PPI model. This unique molecular design was conceptualized to exploit molecular strains of the sandwiched reporters appended by rapamycin-triggered intramolecular PPIs. The ligand-sensing properties of the templates were maximized by interface truncations and substrate modulation. The highest fold intensities, 9.4 and 16.6, of the templates were accomplished with RLuc86SG and ALuc49, respectively. The spectra of the templates, according to substrates, revealed that the colors are tunable to blue, green, and yellow. The putative substrate-binding chemistry and the working mechanisms of the probes were computationally modeled in the presence or absence of rapamycin. Considering that the molecular strain probe templates are applicable to other PPI models, the present approach would broaden the scope of the bioassay toolbox, which harnesses the privilege of luciferase reporters and the unique concept of the molecular strain probes into bioassays and molecular imaging.
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Affiliation(s)
- Sung-Bae Kim
- Environmental Management Research Institute (EMRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, Japan
| | - Tadaomi Furuta
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama 226-8501, Japan
| | - Genta Kamiya
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu 182-8585, Japan
| | - Nobuo Kitada
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu 182-8585, Japan
| | - Ramasamy Paulmurugan
- Molecular Imaging Program at Stanford, Bio-X Program, Stanford University School of Medicine, Palo Alto, CA 94304, USA
| | - Shojiro A. Maki
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu 182-8585, Japan
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Kusov PA, Kotelevtsev YV, Drachev VP. Cortisol Monitoring Devices toward Implementation for Clinically Relevant Biosensing In Vivo. Molecules 2023; 28:molecules28052353. [PMID: 36903600 PMCID: PMC10005364 DOI: 10.3390/molecules28052353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 02/23/2023] [Accepted: 02/24/2023] [Indexed: 03/08/2023] Open
Abstract
Cortisol is a steroid hormone that regulates energy metabolism, stress reactions, and immune response. Cortisol is produced in the kidneys' adrenal cortex. Its levels in the circulatory system are regulated by the neuroendocrine system with a negative feedback loop of the hypothalamic-pituitary-adrenal axis (HPA-axis) following circadian rhythm. Conditions associated with HPA-axis disruption cause deteriorative effects on human life quality in numerous ways. Psychiatric, cardiovascular, and metabolic disorders as well as a variety of inflammatory processes accompanying age-related, orphan, and many other conditions are associated with altered cortisol secretion rates and inadequate responses. Laboratory measurements of cortisol are well-developed and based mainly on the enzyme linked immunosorbent assay (ELISA). There is a great demand for a continuous real-time cortisol sensor that is yet to be developed. Recent advances in approaches that will eventually culminate in such sensors have been summarized in several reviews. This review compares different platforms for direct cortisol measurements in biological fluids. The ways to achieve continuous cortisol measurements are discussed. A cortisol monitoring device will be essential for personified pharmacological correction of the HPA-axis toward normal cortisol levels through a 24-h cycle.
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Affiliation(s)
- Pavel A. Kusov
- Center for Engineering Physics, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
- Correspondence:
| | - Yuri V. Kotelevtsev
- Vladimir Zelman Center for Neurobiology and Brain Rehabilitation, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
| | - Vladimir P. Drachev
- Center for Engineering Physics, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
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Bioluminescent imaging systems boosting near-infrared signals in mammalian cells. Photochem Photobiol Sci 2023:10.1007/s43630-023-00367-8. [PMID: 36732398 DOI: 10.1007/s43630-023-00367-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 01/12/2023] [Indexed: 02/04/2023]
Abstract
Bioluminescence (BL) is broadly used as an optical readout in bioassays and molecular imaging. In this study, the near-infrared (NIR) BL imaging systems were developed. The system was harnessed by prototype copepod luciferases, artificial luciferase 30 (ALuc30) and its miniaturized version picALuc, and were characterized with 17 kinds of coelenterazine (CTZ) analogues carrying bulky functional groups or cyanine 5 (Cy5). They were analyzed of BL spectral peaks and enzymatic kinetics, and explained with computational modeling. The results showed that (1) the picALuc-based system surprisingly boosts the BL intensities predominantly in the red and NIR region with its specific CTZ analogues; (2) both ALuc30- and picALuc-based systems develop unique through-bond energy transfer (TBET)-driven spectral bands in the NIR region with a Cy5-conjugated CTZ analogue (Cy5-CTZ); and (3) according to the computational modeling, the miniaturized version, picALuc, has a large binding pocket, which can accommodate CTZ analogues containing bulky functional groups and thus allowing NIR BL. This study is an important addition to the BL imaging toolbox with respect to the development of orthogonal NIR reporter systems applicable to physiological samples, together with the understanding of the BL-emitting chemistry of marine luciferases.
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S-Series Coelenterazine-Driven Combinatorial Bioluminescence Imaging Systems for Mammalian Cells. Int J Mol Sci 2023; 24:ijms24021420. [PMID: 36674934 PMCID: PMC9865520 DOI: 10.3390/ijms24021420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 01/07/2023] [Accepted: 01/09/2023] [Indexed: 01/12/2023] Open
Abstract
A unique combinatorial bioluminescence (BL) imaging system was developed for determining molecular events in mammalian cells with various colors and BL intensity patterns. This imaging system consists of one or multiple reporter luciferases and a series of novel coelenterazine (CTZ) analogues named "S-series". For this study, ten kinds of novel S-series CTZ analogues were synthesized and characterized concerning the BL intensities, spectra, colors, and specificity of various marine luciferases. The characterization revealed that the S-series CTZ analogues luminesce with blue-to-orange-colored BL spectra with marine luciferases, where the most red-shifted BL spectrum peaked at 583 nm. The colors completed a visible light color palette with those of our precedent C-series CTZ analogues. The synthesized substrates S1, S5, S6, and S7 were found to have a unique specificity with marine luciferases, such as R86SG, NanoLuc (shortly, NLuc), and ALuc16. They collectively showed unique BL intensity patterns to identify the marine luciferases together with colors. The marine luciferases, R86SG, NLuc, and ALuc16, were multiplexed into multi-reporter systems, the signals of which were quantitatively unmixed with the specific substrates. When the utility was applied to a single-chain molecular strain probe, the imaging system simultaneously reported three different optical indexes for a ligand, i.e., unique BL intensity and color patterns for identifying the reporters, together with the ligand-specific fold intensities in mammalian cells. This study directs a new combinatorial BL imaging system to specific image molecular events in mammalian cells with multiple optical indexes.
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Kim SB, Nishihara R, Paulmurugan R. Near-Infrared Imaging of Steroid Hormone Activities Using Bright BRET Templates. Int J Mol Sci 2022; 24:ijms24010677. [PMID: 36614119 PMCID: PMC9820568 DOI: 10.3390/ijms24010677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 12/27/2022] [Accepted: 12/28/2022] [Indexed: 01/03/2023] Open
Abstract
Bioluminescence (BL) is an excellent optical readout for bioassays and molecular imaging. Herein, we accomplished new near infrared bioluminescence resonance energy transfer (NIR-BRET) templates for monitoring molecular events in cells with higher sensitivity. We first identified the best resonance energy donor for the NIR-BRET templates through the characterization of many coelenterazine (CTZ)-marine luciferase combinations. As a result, we found that NLuc-DBlueC and ALuc47-nCTZ combinations showed luminescence in the blue emission wavelength with excellent BL intensity and stability, for example, the NLuc-DBlueC and ALuc47-nCTZ combinations were 17-fold and 22-fold brighter than their second highest combinations, respectively, and were stably bright in living mammalian cells for at least 10 min. To harness the excellent BL properties to the NIR-BRET systems, NLuc and ALuc47 were genetically fused to fluorescent proteins (FPs), allowing large "blue-to-red" shifts, such as LSSmChe, LSSmKate2, and LSSmNep (where LSS means Large Stokes Shift). The excellent LSSmNep-NLuc combination showed approximately 170 nm large resonance energy shift from blue to red. The established templates were further utilized in the development of new NIR-BRET systems for imaging steroid hormone activities by sandwiching the ligand-binding domain of a nuclear receptor (NR-LBD) between the luciferase and the FP of the template. The NIR-BRET systems showed a specific luminescence signal upon exposure to steroid hormones, such as androgen, estrogen, and cortisol. The present NIR-BRET templates are important additions for utilizing their advantageous imaging of various molecular events with high efficiency and brightness in physiological samples.
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Affiliation(s)
- Sung-Bae Kim
- Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba 305-8569, Ibaraki, Japan
- Correspondence: (S.-B.K.); (R.P.)
| | - Ryo Nishihara
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba 305-8566, Ibaraki, Japan
- Japan Science and Technology Agency (JST), PREST, 4-1-8, Honcho, Kawaguchi 332-0012, Saitama, Japan
| | - Ramasamy Paulmurugan
- Molecular Imaging Program at Stanford, Bio-X Program, Stanford University School of Medicine, Palo Alto, CA 94304, USA
- Correspondence: (S.-B.K.); (R.P.)
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11
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Wu Y, Jiang T. Developments in FRET- and BRET-Based Biosensors. MICROMACHINES 2022; 13:mi13101789. [PMID: 36296141 PMCID: PMC9610962 DOI: 10.3390/mi13101789] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/14/2022] [Accepted: 10/17/2022] [Indexed: 05/25/2023]
Abstract
Resonance energy transfer technologies have achieved great success in the field of analysis. Particularly, fluorescence resonance energy transfer (FRET) and bioluminescence resonance energy transfer (BRET) provide strategies to design tools for sensing molecules and monitoring biological processes, which promote the development of biosensors. Here, we provide an overview of recent progress on FRET- and BRET-based biosensors and their roles in biomedicine, environmental applications, and synthetic biology. This review highlights FRET- and BRET-based biosensors and gives examples of their applications with their design strategies. The limitations of their applications and the future directions of their development are also discussed.
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Affiliation(s)
- Yuexin Wu
- School of Life Sciences, Peking University, Beijing 100871, China
| | - Tianyu Jiang
- Shenzhen Research Institute of Shandong University, Shenzhen 518000, China
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, Shandong University, Qingdao 266237, China
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12
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Kamiya G, Kitada N, Maki S, Kim SB. Multiplex quadruple bioluminescent assay system. Sci Rep 2022; 12:17485. [PMID: 36261452 PMCID: PMC9581999 DOI: 10.1038/s41598-022-20468-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 09/13/2022] [Indexed: 01/12/2023] Open
Abstract
Bioluminescence (BL) is unique cold body radiation of light, generated by luciferin-luciferase reactions and commonly used in various bioassays and molecular imaging. However, most of the peak emissions of BL populate the blue-yellow region and have broad spectral bandwidths and thus superimpose each other, causing optical cross-leakages in multiplex assays. This study synthesized a new series of coelenterazine (CTZ) analogues, named K-series, that selectively illuminates marine luciferases with unique, blue-shifted spectral properties. The optical property and specificity of the K-series CTZ analogues were characterized by marine luciferases, with K2 and K5 found to specifically luminesce with ALuc- and RLuc-series marine luciferases, respectively. The results confirmed that the luciferase specificity and color variation of the CTZ analogues minimize the cross-leakages of BL signals and enable high-throughput screening of specific ligands in the mixture. The specificity and color variation of the substrates were further tailored to marine luciferases (or single-chain bioluminescent probes) to create a multiplex quadruple assay system with four integrated, single-chain bioluminescent probes, with each probe designed to selectively luminesce only with its specific ligand (first authentication) and a specific CTZ analogue (second authentication). This unique multiplex quadruple bioluminescent assay system is an efficient optical platform for specific and high-throughput imaging of multiple optical markers in bioassays without optical cross-leakages.
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Affiliation(s)
- Genta Kamiya
- grid.266298.10000 0000 9271 9936Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585 Japan
| | - Nobuo Kitada
- grid.266298.10000 0000 9271 9936Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585 Japan
| | - Shojiro Maki
- grid.266298.10000 0000 9271 9936Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585 Japan
| | - Sung Bae Kim
- grid.208504.b0000 0001 2230 7538Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, 305-8569 Japan
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13
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Tang C, Wang X, Jin Y, Wang F. Recent advances in HDAC-targeted imaging probes for cancer detection. Biochim Biophys Acta Rev Cancer 2022; 1877:188788. [PMID: 36049581 DOI: 10.1016/j.bbcan.2022.188788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 10/14/2022]
Abstract
Histone Deacetylases (HDACs) are abnormally high expressed in various cancers and play a crucial role in regulating gene expression. While HDAC-targeted inhibitors have been rapidly developed and approved in the last twenty years, noninvasive monitoring and visualizing the expression levels of HDACs in tumor tissues might help to early diagnosis in cancer and predict the response to HDAC-targeted cancer therapy. In this review, we summarize the recent advancements in the development of HDAC-targeted probes and their applications in cancer imaging and image-guided surgery. We also discuss the design strategies, advantages and disadvantages of these probes. We hope that this review will provide guidance for the design of HDAC-targeted imaging probes and clinical applications in future.
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Affiliation(s)
- Chu Tang
- Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710126, China; Xianyang Key Laboratory of Molecular Imaging and Drug Synthesis, School of Pharmacy, School of Pharmacy, Shaanxi Institute of International Trade & Commerce, Xianyang 712046, Shaanxi, China
| | - Xinan Wang
- Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710126, China
| | - Yushen Jin
- Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Center for Disease Prevention and Control, Beijing 100013, China
| | - Fu Wang
- Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710126, China; Xianyang Key Laboratory of Molecular Imaging and Drug Synthesis, School of Pharmacy, School of Pharmacy, Shaanxi Institute of International Trade & Commerce, Xianyang 712046, Shaanxi, China; Institute of Medical Engineering, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an 710061, China.
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14
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Bioluminescence Sensing in 3D Spherical Microtissues for Multiple Bioactivity Analysis of Environmental Samples. SENSORS 2022; 22:s22124568. [PMID: 35746350 PMCID: PMC9229012 DOI: 10.3390/s22124568] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 06/13/2022] [Accepted: 06/14/2022] [Indexed: 02/04/2023]
Abstract
The development of predictive in vitro sensing tools able to provide rapid information on the different bioactivities of a sample is of pivotal importance, not only to monitor environmental toxicants, but also to understand their mechanisms of action on diverse molecular pathways. This mechanistic understanding is highly important for the characterization of toxicological hazards, and for the risk assessment of chemicals and environmental samples such as surface waters and effluents. Prompted by this need, we developed and optimized a straightforward bioluminescent multiplexed assay which enables the measurement of four bioactivities, selected for their relevance from a toxicological perspective, in bioluminescent microtissues. The assay was developed to monitor inflammatory, antioxidant, and toxic activity, and the presence of heavy metals, and was successfully applied to the analysis of river water samples, showing potential applicability for environmental analyses. The assay, which does not require advanced equipment, can be easily implemented in general laboratories equipped with basic cell culture facilities and a luminometer.
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15
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Li Y, Jin C, Xu H, Wu W, Wang Y, Wu J, Liu T, Wan G, Yue X, Bu X. Identification of 2-Benzylidene-tetralone Derivatives as Highly Potent and Reversible Firefly Luciferase Inhibitors. ACS Med Chem Lett 2022; 13:304-311. [PMID: 35178187 PMCID: PMC8842144 DOI: 10.1021/acsmedchemlett.1c00671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 01/14/2022] [Indexed: 11/28/2022] Open
Abstract
The extensive applications of Firefly luciferase (Fluc) in numerous biological, biomedical, and clinical investigations rendered an urgent need for efficient and biocompatible Fluc inhibitors for the construction of novel assay platforms. Herein we describe the identification of 2-benzylidene-tetralone derivatives as highly potent and reversible Firefly luciferase inhibitors by competing with d-luciferin. The most active compound 48 was found to have >7000 fold higher potency (IC50 = 0.25 nM) than that of the well-known luciferase inhibitor resveratrol (IC50 = 1.9 μM) biochemically with sub- to low nanomolar IC50 values, and it can efficiently block the Fluc generated bioluminescence in vivo.
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Affiliation(s)
- Yunzhi Li
- School
of Pharmaceutical Sciences, Sun Yat-sen
University, Guangzhou 510006, China
| | - Chaoying Jin
- School
of Pharmaceutical Sciences, Sun Yat-sen
University, Guangzhou 510006, China
| | - Huiying Xu
- School
of Pharmaceutical Sciences, Sun Yat-sen
University, Guangzhou 510006, China
| | - Weijian Wu
- School
of Pharmaceutical Sciences, Sun Yat-sen
University, Guangzhou 510006, China
| | - Youqiao Wang
- School
of Pharmaceutical Sciences, Sun Yat-sen
University, Guangzhou 510006, China
| | - Jiaxin Wu
- School
of Pharmaceutical Sciences, Sun Yat-sen
University, Guangzhou 510006, China
| | - Tingyu Liu
- State
Key Laboratory of Oncology in South China, Collaborative Innovation
Center for Cancer Medicine, Sun Yat-sen
University Cancer Center, Guangzhou 510060, China
| | - Guohui Wan
- School
of Pharmaceutical Sciences, Sun Yat-sen
University, Guangzhou 510006, China
| | - Xin Yue
- Department
of Radiation Oncology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China,Institute
of Precision Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China,
| | - Xianzhang Bu
- School
of Pharmaceutical Sciences, Sun Yat-sen
University, Guangzhou 510006, China,. Tel and fax: 020-39943054
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16
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Besednova NN, Zaporozhets TS, Andryukov BG, Kryzhanovsky SP, Ermakova SP, Kuznetsova TA, Voronova AN, Shchelkanov MY. Antiparasitic Effects of Sulfated Polysaccharides from Marine Hydrobionts. Mar Drugs 2021; 19:637. [PMID: 34822508 PMCID: PMC8624348 DOI: 10.3390/md19110637] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/07/2021] [Accepted: 11/10/2021] [Indexed: 12/15/2022] Open
Abstract
This review presents materials characterizing sulfated polysaccharides (SPS) of marine hydrobionts (algae and invertebrates) as potential means for the prevention and treatment of protozoa and helminthiasis. The authors have summarized the literature on the pathogenetic targets of protozoa on the host cells and on the antiparasitic potential of polysaccharides from red, brown and green algae as well as certain marine invertebrates. Information about the mechanisms of action of these unique compounds in diseases caused by protozoa has also been summarized. SPS is distinguished by high antiparasitic activity, good solubility and an almost complete absence of toxicity. In the long term, this allows for the consideration of these compounds as effective and attractive candidates on which to base drugs, biologically active food additives and functional food products with antiparasitic activity.
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Affiliation(s)
- Natalya N. Besednova
- G.P. Somov Research Institute of Epidemiology and Microbiology, Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing, 690087 Vladivostok, Russia; (T.S.Z.); (B.G.A.); (T.A.K.); (A.N.V.); (M.Y.S.)
| | - Tatyana S. Zaporozhets
- G.P. Somov Research Institute of Epidemiology and Microbiology, Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing, 690087 Vladivostok, Russia; (T.S.Z.); (B.G.A.); (T.A.K.); (A.N.V.); (M.Y.S.)
| | - Boris G. Andryukov
- G.P. Somov Research Institute of Epidemiology and Microbiology, Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing, 690087 Vladivostok, Russia; (T.S.Z.); (B.G.A.); (T.A.K.); (A.N.V.); (M.Y.S.)
- School of Biomedicine, Far Eastern Federal University (FEFU), 690091 Vladivostok, Russia
| | - Sergey P. Kryzhanovsky
- Medical Association of the Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia;
| | - Svetlana P. Ermakova
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia;
| | - Tatyana A. Kuznetsova
- G.P. Somov Research Institute of Epidemiology and Microbiology, Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing, 690087 Vladivostok, Russia; (T.S.Z.); (B.G.A.); (T.A.K.); (A.N.V.); (M.Y.S.)
| | - Anastasia N. Voronova
- G.P. Somov Research Institute of Epidemiology and Microbiology, Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing, 690087 Vladivostok, Russia; (T.S.Z.); (B.G.A.); (T.A.K.); (A.N.V.); (M.Y.S.)
| | - Mikhail Y. Shchelkanov
- G.P. Somov Research Institute of Epidemiology and Microbiology, Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing, 690087 Vladivostok, Russia; (T.S.Z.); (B.G.A.); (T.A.K.); (A.N.V.); (M.Y.S.)
- School of Biomedicine, Far Eastern Federal University (FEFU), 690091 Vladivostok, Russia
- National Scientific Center of Marine Biology, Far Eastern Branch of the Russian Academy of Sciences, 690041 Vladivostok, Russia
- Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
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17
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Li B, Chen R, Zhu C, Kong F. Glowing plants can light up the night sky? A review. Biotechnol Bioeng 2021; 118:3706-3715. [PMID: 34251679 DOI: 10.1002/bit.27884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 07/04/2021] [Accepted: 07/09/2021] [Indexed: 11/10/2022]
Abstract
Luminescence, a physical phenomenon that producing cool light in vivo, has been found in bacteria, fungi, and animals but not yet in terrestrial higher plants. Through genetic engineering, it is feasible to introduce luminescence systems into living plant cells as biomarkers. Recently, some plants transformed with luminescent systems can glimmer in darkness, which can be observed by our naked eyes and provides a novel lighting resource. In this review, we summarized the bioassay development of luminescence in plant cells, followed by exampling the successful cases of glowing plants transformed with diverse luminescent systems. The potential key factors to design or optimize a glowing plant were also discussed. Our review is useful for the creation of the optimized glowing plants, which can be used not only in scientific research, but also as promising substitutes of artificial light sources in the future.
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Affiliation(s)
- Bolong Li
- School of Bioengineering, Dalian University of Technology, Dalian, China
| | - Ru Chen
- School of Bioengineering, Dalian University of Technology, Dalian, China
| | - Chenba Zhu
- School of Bioengineering, Dalian University of Technology, Dalian, China.,Institute of Biotechnology, RWTH Aachen University, Aachen, Germany
| | - Fantao Kong
- School of Bioengineering, Dalian University of Technology, Dalian, China
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18
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Calabretta MM, Montali L, Lopreside A, Fragapane F, Iacoangeli F, Roda A, Bocci V, D'Elia M, Michelini E. Ultrasensitive On-Field Luminescence Detection Using a Low-Cost Silicon Photomultiplier Device. Anal Chem 2021; 93:7388-7393. [PMID: 33973781 PMCID: PMC8253476 DOI: 10.1021/acs.analchem.1c00899] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
![]()
The availability
of portable analytical devices for on-site monitoring
and rapid detection of analytes of forensic, environmental, and clinical
interest is vital. We report the development of a portable device
for the detection of biochemiluminescence relying on silicon photomultiplier
(SiPM) technology, called LuminoSiPM, which includes a 3D printed
sample holder that can be adapted for both liquid samples and paper-based
biosensing. We performed a comparison of analytical performance in
terms of detectability with a benchtop luminometer, a portable cooled
charge-coupled device (CCD sensor), and smartphone-integrated complementary
metal oxide semiconductor (CMOS) sensors. As model systems, we used
two luciferase/luciferin systems emitting at different wavelengths
using purified protein solutions: the green-emitting P. pyralis mutant Ppy-GR-TS (λmax 550 nm) and the blue-emitting
NanoLuc (λmax 460 nm). A limit of detection of 9
femtomoles was obtained for NanoLuc luciferase, about 2 and 3 orders
of magnitude lower than that obtained with the portable CCD camera
and with the smartphone, respectively. A proof-of-principle forensic
application of LuminoSiPM is provided, exploiting an origami chemiluminescent
paper-based sensor for acetylcholinesterase inhibitors, showing high
potential for this portable low-cost device for on-site applications
with adequate sensitivity for detecting low light intensities in critical
fields.
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Affiliation(s)
- Maria Maddalena Calabretta
- Department of Chemistry "Giacomo Ciamician", University of Bologna, 40126 Bologna, Italy.,Center for Applied Biomedical Research (CRBA), University of Bologna, 40126 Bologna, Italy
| | - Laura Montali
- Department of Chemistry "Giacomo Ciamician", University of Bologna, 40126 Bologna, Italy.,Center for Applied Biomedical Research (CRBA), University of Bologna, 40126 Bologna, Italy
| | - Antonia Lopreside
- Department of Chemistry "Giacomo Ciamician", University of Bologna, 40126 Bologna, Italy.,Center for Applied Biomedical Research (CRBA), University of Bologna, 40126 Bologna, Italy
| | - Fabio Fragapane
- Gabinetto Regionale di Polizia Scientifica per l'Emilia-Romagna, 40123, Bologna, Italy
| | | | - Aldo Roda
- Department of Chemistry "Giacomo Ciamician", University of Bologna, 40126 Bologna, Italy.,INBB, Istituto Nazionale di Biostrutture e Biosistemi, 00136 Rome, Italy
| | - Valerio Bocci
- INFN, Istituto Nazionale di Fisica Nucleare Sezione di Roma, 00185 Rome, Italy
| | - Marcello D'Elia
- Gabinetto Regionale di Polizia Scientifica per l'Emilia-Romagna, 40123, Bologna, Italy
| | - Elisa Michelini
- Department of Chemistry "Giacomo Ciamician", University of Bologna, 40126 Bologna, Italy.,Center for Applied Biomedical Research (CRBA), University of Bologna, 40126 Bologna, Italy.,INBB, Istituto Nazionale di Biostrutture e Biosistemi, 00136 Rome, Italy.,Health Sciences and Technologies-Interdepartmental Center for Industrial Research (HST-ICIR), University of Bologna, 40126 Bologna, Italy
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