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Jiang L, He Y, Lan M, Ding X, Lu Q, Song L, Huang Y, Li D. High-Resolution and Dynamic Visualization of Intracellular Redox Potential Using a Metal-Organic Framework-Functionalized Nanopotentiometer. Anal Chem 2024; 96:7497-7505. [PMID: 38687987 DOI: 10.1021/acs.analchem.4c00082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Redox potential plays a key role in regulating intracellular signaling pathways, with its quantitative analysis in individual cells benefiting our understanding of the underlying mechanism in the pathophysiological events. Here, a metal organic framework (MOF)-functionalized SERS nanopotentiometer has been developed for the dynamic monitoring of intracellular redox potential. The approach is based on the encapsulation of zirconium-based MOF (Uio-66-F4) on a surface of gold-silver nanorods (Au-Ag NRs) that is modified with the newly synthesized redox-sensitive probe ortho-mercaptohydroquinone (HQ). Thanks to size exclusion of MOF as the chemical protector, the nanopotentiometer can be adapted to long-term use and possess high anti-interference ability toward nonredox species. Combining the superior fingerprint identification of SERS with the electrochemical activity of the quinone/hydroquinone, the nanopotentiometer shows a reversible redox responsivity and can quantify redox potential with a relatively wide range of -250-100 mV. Furthermore, the nanopotentiometer allows for dynamic visualization of intracellular redox potential changes induced by drugs' stimulation in a high-resolution manner. The developed approach would be promising for offering new insights into the correlation between redox potential and tumor proliferation-involved processes such as oxidative stress and hypoxia.
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Affiliation(s)
- Lei Jiang
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry & Chemical Engineering, Central South University, Changsha, Hunan 410083, China
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China
- Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yue He
- Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Minhuan Lan
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry & Chemical Engineering, Central South University, Changsha, Hunan 410083, China
| | - Xin Ding
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China
| | - Qiaoyi Lu
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China
| | - Liping Song
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China
| | - Youju Huang
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China
| | - Dawei Li
- Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry, Joint International Laboratory for Precision Chemistry, Frontiers Science Center for Materiobiology & Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
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Skinner WH, Robinson N, Hardisty GR, Fleming H, Geddis A, Bradley M, Gray RD, Campbell CJ. SERS microsensors for pH measurements in the lumen and ECM of stem cell derived human airway organoids. Chem Commun (Camb) 2023; 59:3249-3252. [PMID: 36815668 DOI: 10.1039/d2cc06582g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Patient derived organoids have the potential to improve the physiological relevance of in vitro disease models. However, the 3D architecture of these self-assembled cellular structures makes probing their biochemistry more complex than in traditional 2D culture. We explore the application of surface enhanced Raman scattering microsensors (SERS-MS) to probe local pH gradients within patient derived airway organoid cultures. SERS-MS consist of solid polymer cores decorated with surface immobilised gold nanoparticles which are functionalised with pH sensitive reporter molecule 4-mercaptobenzoic acid (MBA). We demonstrate that by mixing SERS-MS into the extracellular matrix (ECM) of airway organoid cultures the probes can be engulfed by expanding organoids and report on local pH in the organoid lumen and ECM.
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Affiliation(s)
- William H Skinner
- School of Physics and Astronomy, University of Exeter, Exeter EX4 4QL, UK
| | - Nicola Robinson
- Centre for Inflammation Research, The Queen's Medical Research Institute, The University of Edinburgh, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
| | - Gareth R Hardisty
- Centre for Inflammation Research, The Queen's Medical Research Institute, The University of Edinburgh, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
| | - Holly Fleming
- School of Science and Engineering, University of Dundee, Dundee DD1 4HN, Scotland, UK
| | - Ailsa Geddis
- Centre for Inflammation Research, The Queen's Medical Research Institute, The University of Edinburgh, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
- Joseph Black Building, The University of Edinburgh, David Brewster Rd, Edinburgh EH9 3FJ, UK.
| | - Mark Bradley
- Joseph Black Building, The University of Edinburgh, David Brewster Rd, Edinburgh EH9 3FJ, UK.
| | - Robert D Gray
- Centre for Inflammation Research, The Queen's Medical Research Institute, The University of Edinburgh, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
| | - Colin J Campbell
- Joseph Black Building, The University of Edinburgh, David Brewster Rd, Edinburgh EH9 3FJ, UK.
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Guk DA, Gibadullina KR, Burlutskiy RO, Pavlov KG, Moiseeva AA, Tafeenko VA, Lyssenko KA, Gandalipov ER, Shtil AA, Beloglazkina EK. New Titanocene (IV) Dicarboxylates with Potential Cytotoxicity: Synthesis, Structure, Stability and Electrochemistry. Int J Mol Sci 2023; 24:ijms24043340. [PMID: 36834751 PMCID: PMC9964323 DOI: 10.3390/ijms24043340] [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: 01/17/2023] [Revised: 02/02/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
The search for new anticancer drugs based on biogenic metals, which have weaker side effects compared to platinum-based drugs, remains an urgent task in medicinal chemistry. Titanocene dichloride, a coordination compound of fully biocompatible titanium, has failed in pre-clinical trials but continues to attract the attention of researchers as a structural framework for the development of new cytotoxic compounds. In this study, a series of titanocene (IV) carboxylate complexes, both new and those known from the literature, was synthesized, and their structures were confirmed by a complex of physicochemical methods and X-ray diffraction analysis (including one previously unknown structure based on perfluorinated benzoic acid). The comprehensive comparison of three approaches for the synthesis of titanocene derivatives known from the literature (the nucleophilic substitution of chloride anions of titanocene dichloride with sodium and silver salts of carboxylic acids as well as the reaction of dimethyltitanocene with carboxylic acids themselves) made it possible to optimize these methods to obtain higher yields of individual target compounds, generalize the advantages and disadvantages of these techniques, and determine the substrate frames of each method. The redox potentials of all obtained titanocene derivatives were determined by cyclic voltammetry. The relationship between the structure of ligands, the reduction potentials of titanocene (IV), and their relative stability in redox processes, as obtained in this work, can be used for the design and synthesis of new effective cytotoxic titanocene complexes. The study of the stability of the carboxylate-containing derivatives of titanocene obtained in the work in aqueous media showed that they were more resistant to hydrolysis than titanocene dichloride. Preliminary tests of the cytotoxicity of the synthesised titanocene dicarboxilates on MCF7 and MCF7-10A cell lines demonstrated an IC50 ≥ 100 μM for all the obtained compounds.
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Affiliation(s)
- Dmitry A. Guk
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
| | - Karina R. Gibadullina
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
| | - Roman O. Burlutskiy
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
| | - Kirill G. Pavlov
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
| | - Anna A. Moiseeva
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
| | - Viktor A. Tafeenko
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
| | - Konstantin A. Lyssenko
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
| | - Erik R. Gandalipov
- International Institute of Solution Chemistry of Advanced Materials and Technologies, ITMO University, 9 Lomonosov Street, 191002 Saint-Petersburg, Russia
| | - Alexander A. Shtil
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
- Blokhin National Medical Research Center of Oncology, 24 Kashirskoye Shosse, 115522 Moscow, Russia
- Institute of Cyber Intelligence Systems, National Research Nuclear University MEPhI, 31 Kashirskoye Shosse, 115409 Moscow, Russia
| | - Elena K. Beloglazkina
- Chemistry Department, Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia
- Correspondence:
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Milliken AS, Ciesla JH, Nadtochiy SM, Brookes PS. Distinct effects of intracellular vs. extracellular acidic pH on the cardiac metabolome during ischemia and reperfusion. J Mol Cell Cardiol 2023; 174:101-114. [PMID: 36481511 PMCID: PMC9868090 DOI: 10.1016/j.yjmcc.2022.11.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 11/22/2022] [Accepted: 11/25/2022] [Indexed: 12/10/2022]
Abstract
Tissue ischemia results in intracellular pH (pHIN) acidification, and while metabolism is a known driver of acidic pHIN, less is known about how acidic pHIN regulates metabolism. Furthermore, acidic extracellular (pHEX) during early reperfusion confers cardioprotection, but how this impacts metabolism is unclear. Herein we employed LCMS based targeted metabolomics to analyze perfused mouse hearts exposed to: (i) control perfusion, (ii) hypoxia, (iii) ischemia, (iv) enforced acidic pHIN, (v) control reperfusion, and (vi) acidic pHEX (6.8) reperfusion. Surprisingly little overlap was seen between metabolic changes induced by hypoxia, ischemia, and acidic pHIN. Acidic pHIN elevated metabolites in the top half of glycolysis, and enhanced glutathione redox state. Meanwhile, acidic pHEX reperfusion induced substantial metabolic changes in addition to those seen in control reperfusion. This included elevated metabolites in the top half of glycolysis, prevention of purine nucleotide loss, and an enhancement in glutathione redox state. These data led to hypotheses regarding potential roles for methylglyoxal inhibiting the mitochondrial permeability transition pore, and for acidic inhibition of ecto-5'-nucleotidase, as potential mediators of cardioprotection by acidic pHEX reperfusion. However, neither hypothesis was supported by subsequent experiments. In contrast, analysis of cardiac effluents revealed complex effects of pHEX on metabolite transport, suggesting that mildly acidic pHEX may enhance succinate release during reperfusion. Overall, each intervention had distinct and overlapping metabolic effects, suggesting acidic pH is an independent metabolic regulator regardless which side of the cell membrane it is imposed.
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Affiliation(s)
- Alexander S Milliken
- Department of Pharmacology and Physiology, University of Rochester Medical Center, USA
| | - Jessica H Ciesla
- Department of Biochemistry, University of Rochester Medical Center, USA
| | - Sergiy M Nadtochiy
- Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, USA
| | - Paul S Brookes
- Department of Pharmacology and Physiology, University of Rochester Medical Center, USA; Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, USA.
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Koch J, Kerl AC, Schawalder N, Luescher AM, Nguyen BH, Strauss K, Stark WJ, Grass RN. Preserving DNA in Biodegradable Organosilica Encapsulates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:11191-11198. [PMID: 36083165 DOI: 10.1021/acs.langmuir.2c01167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A core-shell strategy was developed to protect synthetic DNA in organosilica particles encompassing dithiol linkages allowing for a DNA loading of 1.1 wt %. DNA stability tests involving bleach as an oxidant showed that following the procedure DNA was sandwiched between core particles of ca. 450 nm size and a protective outer layer, separating the DNA from the environment. Rapid aging tests at 60 °C and 50% relative humidity revealed that the DNA protected within this material was significantly more stable than nonprotected DNA, with an expected ambient temperature half-life of over 60 years. Still, and due to the presence of the dithiol linkages in the backbone of the organosilica material, the particles degraded in the presence of reducing agents (TCEP and glutathione) and disintegrated within several days in a simulated compost environment, which was employed to test the biodegradability of the material. This is in contrast to DNA encapsulated following state of the art procedures in pure SiO2 particles, which do not biodegrade in the investigated timeframes and conditions. The results show that synthetic DNA protected within dithiol comprising organosilica particles presents a strategy to store digital data at a high storage capacity for long time frames in a fully biodegradable format.
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Affiliation(s)
- Julian Koch
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Ann-Christin Kerl
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Natascha Schawalder
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Anne M Luescher
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Bichlien H Nguyen
- Microsoft Research, One Microsoft Way, Redmond, Washington 98052, United States
| | - Karin Strauss
- Microsoft Research, One Microsoft Way, Redmond, Washington 98052, United States
| | - Wendelin J Stark
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Robert N Grass
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
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Ali A, Nettey-Oppong EE, Effah E, Yu CY, Muhammad R, Soomro TA, Byun KM, Choi SH. Miniaturized Raman Instruments for SERS-Based Point-of-Care Testing on Respiratory Viruses. BIOSENSORS 2022; 12:bios12080590. [PMID: 36004986 PMCID: PMC9405795 DOI: 10.3390/bios12080590] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 07/24/2022] [Accepted: 07/26/2022] [Indexed: 06/12/2023]
Abstract
As surface-enhanced Raman scattering (SERS) has been used to diagnose several respiratory viruses (e.g., influenza A virus subtypes such as H1N1 and the new coronavirus SARS-CoV-2), SERS is gaining popularity as a method for diagnosing viruses at the point-of-care. Although the prior and quick diagnosis of respiratory viruses is critical in the outbreak of infectious disease, ELISA, PCR, and RT-PCR have been used to detect respiratory viruses for pandemic control that are limited for point-of-care testing. SERS provides quantitative data with high specificity and sensitivity in a real-time, label-free, and multiplex manner recognizing molecular fingerprints. Recently, the design of Raman spectroscopy system was simplified from a complicated design to a small and easily accessible form that enables point-of-care testing. We review the optical design (e.g., laser wavelength/power and detectors) of commercialized and customized handheld Raman instruments. As respiratory viruses have prominent risk on the pandemic, we review the applications of handheld Raman devices for detecting respiratory viruses. By instrumentation and commercialization advancements, the advent of the portable SERS device creates a fast, accurate, practical, and cost-effective analytical method for virus detection, and would continue to attract more attention in point-of-care testing.
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Affiliation(s)
- Ahmed Ali
- Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Pakistan;
| | - Ezekiel Edward Nettey-Oppong
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea; (E.E.N.-O.); (E.E.); (C.Y.Y.); (R.M.)
| | - Elijah Effah
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea; (E.E.N.-O.); (E.E.); (C.Y.Y.); (R.M.)
| | - Chan Yeong Yu
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea; (E.E.N.-O.); (E.E.); (C.Y.Y.); (R.M.)
| | - Riaz Muhammad
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea; (E.E.N.-O.); (E.E.); (C.Y.Y.); (R.M.)
| | - Toufique Ahmed Soomro
- Department of Electronic Engineering, Quid-e-Awam University of Engineering, Science and Technology, Larkana 77150, Pakistan;
| | - Kyung Min Byun
- Department of Biomedical Engineering, Kyung Hee University, Yongin 17104, Korea
- Department of Electronics and Information Convergence Engineering, Kyung Hee University, Yongin 17104, Korea
| | - Seung Ho Choi
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea; (E.E.N.-O.); (E.E.); (C.Y.Y.); (R.M.)
- Department of Integrative Medicine, Major in Digital Healthcare, Yonsei University College of Medicine, Seoul 06229, Korea
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Zhu Y, Derami HG, Gupta P, Gupta R, Singamaneni S, Jun YS. Ionic surface propensity controls pH in nanopores. Chem 2022. [DOI: 10.1016/j.chempr.2022.07.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Houshmand A, Heroux D, Liu DY, Zhou W, Linington RG, Bally M, Warren JJ, Walsby CJ. Ferrocene-appended anthraquinone and coumarin as redox-active cytotoxins. Dalton Trans 2022; 51:11437-11447. [PMID: 35822497 DOI: 10.1039/d2dt01251k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Appending of ferrocene (Fc) to biologically-active organic backbones can generate novel multi-functional species for targeting bacteria and cancer. In this work Fc was linked to coumarin and anthraquinone with the goal of harnessing the redox-active Fc centre to generate new compounds that exhibit cytoxicity through the generation of toxic reactive oxygen species (ROS). A Cu(I)-catalyzed azide-alkyne cycloaddition "click" reaction was used to connect the organic and Fc components via a triazole linker. Cyclic voltammetry shows that the Fc potentials are suitable for oxidation by biological hydrogen peroxide to give reactive ferrocenium (Fc+) species, which can then generate hydroxyl radicals. The ability of the compounds to generate hydroxyl radicals in the presence of hydrogen peroxide was shown directly using EPR spin-trapping experiments. Furthermore, in vitro studies in MCF-7 breast cancer cells show significant increases in ROS following incubation with the Fc-functionalized compounds. Screening for antibacterial activity produced negative results for all of the Fc compounds, consitent with low levels of hydrogen peroxide typically found in bacteria. By contrast, Fc-coumarin showed cytotoxicity against A549 lung cancer and SKOV3 ovarian cancer cell lines, whereas the parent compound was inactive. This is consistent both with the cytoxic potential of the Fc group and the elevated hydrogen peroxide levels found in many cancers. Interestingly, the anthraquinone compounds showed the opposite effect with the parent compounds showing modest activity against A549 cells, but the Fc compounds being inactive. This demonstrates other potential negative impacts of including Fc, such as significantly increased lipophilicity.
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Affiliation(s)
- Aryan Houshmand
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6, Canada.
| | - Devon Heroux
- BC Cancer Research Institute, 675 West 10th Ave., Vancouver, BC, V5Z 1L3, Canada
| | - Dennis Y Liu
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6, Canada.
| | - Wen Zhou
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6, Canada.
| | - Roger G Linington
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6, Canada.
| | - Marcel Bally
- BC Cancer Research Institute, 675 West 10th Ave., Vancouver, BC, V5Z 1L3, Canada
| | - Jeffrey J Warren
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6, Canada.
| | - Charles J Walsby
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6, Canada.
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Tanwar S, Kim JH, Bulte JWM, Barman I. Surface-enhanced Raman scattering: An emerging tool for sensing cellular function. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2022; 14:e1802. [PMID: 35510405 PMCID: PMC9302385 DOI: 10.1002/wnan.1802] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 03/05/2022] [Accepted: 03/27/2022] [Indexed: 12/18/2022]
Abstract
Continuous long-term intracellular imaging and multiplexed monitoring of biomolecular changes associated with key cellular processes remains a challenge for the scientific community. Recently, surface-enhanced Raman scattering (SERS) has been demonstrated as a powerful spectroscopic tool in the field of biology owing to its significant advantages. Some of these include the ability to provide molecule-specific information with exquisite sensitivity, working with small volumes of precious samples, real-time monitoring, and optimal optical contrast. More importantly, the availability of a large number of novel Raman reporters with narrower full width at half maximum (FWHM) of spectral peaks/vibrational modes than conventional fluorophores has created a versatile palette of SERS-based probes that allow targeted multiplex sensing surpassing the detection sensitivity of even fluorescent probes. Due to its nondestructive nature, its applicability has been recognized for biological sensing, molecular imaging, and dynamic monitoring of complex intracellular processes. We critically discuss recent developments in this area with a focus on different applications where SERS has been used for obtaining information that remains elusive for conventional imaging methods. Current reports indicate that SERS has made significant inroads in the field of biology and has the potential to be used for in vivo human applications. This article is categorized under: Diagnostic Tools > In Vitro Nanoparticle-Based Sensing Nanotechnology Approaches to Biology > Nanoscale Systems in Biology Diagnostic Tools > Biosensing Diagnostic Tools > In Vivo Nanodiagnostics and Imaging.
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Affiliation(s)
- Swati Tanwar
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Jeong Hee Kim
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Jeff W M Bulte
- The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA.,Cellular Imaging Section and Vascular Biology Program, Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland, USA.,Department of Chemical & Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA.,Department of Oncology, Johns Hopkins University, Baltimore, Maryland, USA
| | - Ishan Barman
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland, USA.,The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA.,Department of Oncology, Johns Hopkins University, Baltimore, Maryland, USA
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10
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Pielorz S, Czaja T, Szostak R. pH determination of small sample volumes using Raman spectra of azo dyes. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Lee J, Lee H, Kim HJ, Yun J, Lee T, Lee G, Kim HS, Hong Y. Quantification of doping state of redox sensitive nanoparticles for probing the invasiveness of cancer cells using surface enhanced Raman scattering. Mater Today Bio 2022; 14:100241. [PMID: 35313446 PMCID: PMC8933517 DOI: 10.1016/j.mtbio.2022.100241] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 03/07/2022] [Accepted: 03/11/2022] [Indexed: 12/19/2022] Open
Abstract
Redox activity is known to regulate migration, invasion, metastasis, proliferation, and vascularization of cancer. Because cancer is heterogeneous, the role of redox activity in different cancers and cancer-related processes vary widely. In this study, water soluble, Tween 80-coated polyaniline (TPAni) nanoparticles were synthesized and used as nano-agents for sensing the redox activities of various cancer cells. To identify the relationship between the redox activity and the aggressiveness of cancer cells, two different cancer cell lines, derived from the same tissue but different with regards to aggressiveness, were selected for study. First, the cancer cell lines were incubated with TPAni nanoparticles, and an absorbance ratio obtained from the cell culture media was used as a colorimetric indicator of the redox activities of the cells. Simultaneously, hydrophobically modified filter papers coated with silver nanosnowflakes (SNSF) were used as sensing substrates for surface enhanced Raman scattering (SERS). SERS spectra obtained from varying concentrations of rhodamine 6G were used to confirm the detection limit of the SNSF-based SERS substrate. Cell culture media containing TPAni nanoparticles were treated with the SNSF-containing SERS substrates to examine the redox activities of the various cancer cell lines.The redox activities of cancer cell lines were confirmed by absorbance spectral analysis, and these redox activities were better identified via an SERS analysis method. A SNSF-containing SERS substrate, fabricated from SNSF and filter paper, was used to sense redox activity in cancer cell lines and to further identify correlations between redox activity and cancer cell line aggressiveness, as indicated by the use of EpCAM as a biomarker. Finally, potential of in vivo redox activity sensing was also confirmed.
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Affiliation(s)
- Jaehun Lee
- Department of Medical Device, Korea Institute of Machinery and Materials (KIMM), Daegu, 42994, Republic of Korea
| | - Hwunjae Lee
- Department of Radiology, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
- YUHS-KRIBB Medical Convergence Research Institute, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
- Graduate Program of Nanoscience and Technology, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
| | - Hyun Jung Kim
- Department of Medical Device, Korea Institute of Machinery and Materials (KIMM), Daegu, 42994, Republic of Korea
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, 30019, Republic of Korea
| | - Jongsu Yun
- Department of Medical Device, Korea Institute of Machinery and Materials (KIMM), Daegu, 42994, Republic of Korea
| | - Taeha Lee
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, 30019, Republic of Korea
- Interdisciplinary Graduate Program for Artificial Intelligence Smart Convergence Technology, Korea University, Sejong, 30019, Republic of Korea
| | - Gyudo Lee
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, 30019, Republic of Korea
- Interdisciplinary Graduate Program for Artificial Intelligence Smart Convergence Technology, Korea University, Sejong, 30019, Republic of Korea
| | - Hyun Soo Kim
- Department of Electronic Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea
- Corresponding author.
| | - Yoochan Hong
- Department of Medical Device, Korea Institute of Machinery and Materials (KIMM), Daegu, 42994, Republic of Korea
- Corresponding author.
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Sloan-Dennison S, Laing S, Graham D, Faulds K. From Raman to SESORRS: moving deeper into cancer detection and treatment monitoring. Chem Commun (Camb) 2021; 57:12436-12451. [PMID: 34734952 PMCID: PMC8609625 DOI: 10.1039/d1cc04805h] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Raman spectroscopy is a non-invasive technique that allows specific chemical information to be obtained from various types of sample. The detailed molecular information that is present in Raman spectra permits monitoring of biochemical changes that occur in diseases, such as cancer, and can be used for the early detection and diagnosis of the disease, for monitoring treatment, and to distinguish between cancerous and non-cancerous biological samples. Several techniques have been developed to enhance the capabilities of Raman spectroscopy by improving detection sensitivity, reducing imaging times and increasing the potential applicability for in vivo analysis. The different Raman techniques each have their own advantages that can accommodate the alternative detection formats, allowing the techniques to be applied in several ways for the detection and diagnosis of cancer. This feature article discusses the various forms of Raman spectroscopy, how they have been applied for cancer detection, and the adaptation of the techniques towards their use for in vivo cancer detection and in clinical diagnostics. Despite the advances in Raman spectroscopy, the clinical application of the technique is still limited and certain challenges must be overcome to enable clinical translation. We provide an outlook on the future of the techniques in this area and what we believe is required to allow the potential of Raman spectroscopy to be achieved for clinical cancer diagnostics.
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Affiliation(s)
- Sian Sloan-Dennison
- Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, UK.
| | - Stacey Laing
- Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, UK.
| | - Duncan Graham
- Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, UK.
| | - Karen Faulds
- Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, UK.
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13
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Kotturi D, Paterson S, McShane M. Comparison of SERS pH probe responses after microencapsulation within hydrogel matrices. JOURNAL OF BIOMEDICAL OPTICS 2021; 26:JBO-210153R. [PMID: 34519190 PMCID: PMC8435981 DOI: 10.1117/1.jbo.26.9.097001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 08/27/2021] [Indexed: 06/13/2023]
Abstract
SIGNIFICANCE Personalized medicine requires the tracking of an individual's metabolite levels over time to detect anomalies and evaluate the body's response to medications. Implanted sensors offer effective means to continuously monitor specific metabolite levels, provided they are accurate, stable over long time periods, and do no harm. AIM Four types of hydrogel embedded with pH-sensitive sensors were evaluated for their accuracy, sensitivity, reversibility, longevity, dynamic response, and consistency in static versus dynamic conditions and long-term storage. APPROACH Raman spectroscopy was first used to calibrate the intensity of pH-sensitive peaks of the Raman-active hydrogel sensors in a static pH environment. The dynamic response was then assessed for hydrogels exposed to changing pH conditions within a flow cell. Finally, the static pH response after 5 months of storage was determined. RESULTS All four types of hydrogels allowed the surface-enhanced Raman spectroscopy (SERS) sensors to respond to the pH level of the local environment without introducing interfering signals, resulting in consistent calibration curves. When the pH level changed, the probes in the gels were slow to reach steady-state, requiring several hours, and response times were found to vary among hydrogels. Only one type, poly(2-hydroxyethyl methacrylate) (pHEMA), lasted five months without significant degradation of dynamic range. CONCLUSIONS While all hydrogels appear to be viable candidates as biocompatible hosts for the SERS sensing chemistry, pHEMA was found to be most functionally stable over the long interval tested. Poly(ethylene glycol) hydrogels exhibit the most rapid response to changing pH. Since these two gel types are covalently cross-linked and do not generally degrade, they both offer advantages over sodium alginate for use as implants.
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Affiliation(s)
- Dayle Kotturi
- Texas A&M University, Department of Biomedical Engineering, College Station, Texas, United States
| | - Sureyya Paterson
- Texas A&M University, Department of Biomedical Engineering, College Station, Texas, United States
| | - Mike McShane
- Texas A&M University, Department of Biomedical Engineering, College Station, Texas, United States
- Texas A&M University, Department of Materials Science and Engineering, College Station, Texas, United States
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14
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Prosser KE, Xie D, Chu A, MacNeil GA, Varju BR, Kadakia RT, Que EL, Walsby CJ. Copper(II) Pyridyl Aminophenolates: Hypoxia-Selective, Nucleus-Targeting Cytotoxins, and Magnetic Resonance Probes. Chemistry 2021; 27:9839-9849. [PMID: 33878230 DOI: 10.1002/chem.202100603] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Indexed: 11/10/2022]
Abstract
Targeting the low-oxygen (hypoxic) environments found in many tumours by using redox-active metal complexes is a strategy that can enhance efficacy and reduce the side effects of chemotherapies. We have developed a series of CuII complexes with tridentate pyridine aminophenolate-based ligands for preferential activation in the reduction window provided by hypoxic tissues. Furthermore, ligand functionalization with a pendant CF3 group provides a 19 F spectroscopic handle for magnetic-resonance studies of redox processes at the metal centre and behaviour in cellular environments. The phenol group in the ligand backbone was substituted at the para position with H, Cl, and NO2 to modulate the reduction potential of the CuII centre, giving a range of values below the window expected for hypoxic tissues. The NO2 -substituted complex, which has the highest reduction potential, showed enhanced cytotoxic selectivity towards HeLa cells grown under hypoxic conditions. Cell death occurs by apoptosis, as determined by analysis of the cell morphology. A combination of 19 F NMR and ICP-OES indicates localization of the NO2 complex in HeLa cell nuclei and increased cellular accumulation under hypoxia. This correlates with DNA nuclease activity being the likely origin of cytotoxic activity, as demonstrated by cleavage of DNA plasmids in the presence of the CuII nitro complex and a reducing agent. Selective detection of the paramagnetic CuII complexes and their diamagnetic ligands by 19 F MRI suggests hypoxia-targeting theranostic applications by redox activation.
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Affiliation(s)
- Kathleen E Prosser
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC V5A 1S6, Canada.,Department of Chemistry, The University of Texas at Austin, 105 E. 24th Street Stop A5300, Austin, TX 78712, USA
| | - Da Xie
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th Street Stop A5300, Austin, TX 78712, USA
| | - Annica Chu
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC V5A 1S6, Canada
| | - Gregory A MacNeil
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC V5A 1S6, Canada
| | - Bryton R Varju
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC V5A 1S6, Canada
| | - Rahul T Kadakia
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th Street Stop A5300, Austin, TX 78712, USA
| | - Emily L Que
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th Street Stop A5300, Austin, TX 78712, USA
| | - Charles J Walsby
- Department of Chemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC V5A 1S6, Canada
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15
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Jaworska A, Malek K, Kudelski A. Intracellular pH - Advantages and pitfalls of surface-enhanced Raman scattering and fluorescence microscopy - A review. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 251:119410. [PMID: 33465573 DOI: 10.1016/j.saa.2020.119410] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 11/19/2020] [Accepted: 12/29/2020] [Indexed: 05/13/2023]
Abstract
The value of pH in various parts of protoplasm can affect nearly all aspects of cell functions. Therefore, the determination of intracellular acid-base features is required in many areas of biological and biochemical studies. Because of a significant scientific importance of in vivo intracellular pH measurements, various groups carried out such experiments. In this review article we describe intracellular pH measurements using two the most sensitive optical spectroscopies: surface-enhanced Raman scattering (SERS) and fluorescence. It is reasonable to present these two techniques in one review article because the experimental approach in Raman and fluorescence experiments is relatively similar. The basic theoretical background explaining the mechanism of operation of fluorescence and SERS sensors are discussed and the motivations to carry out intracellular pH measurements are briefly described. Future perspectives in this field are also discussed.
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Affiliation(s)
- Aleksandra Jaworska
- Faculty of Chemistry, University of Warsaw, 1 Pasteur St., 02-093 Warsaw, Poland.
| | - Kamilla Malek
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Andrzej Kudelski
- Faculty of Chemistry, University of Warsaw, 1 Pasteur St., 02-093 Warsaw, Poland.
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16
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Yılmaz D, Culha M. Investigation of the pathway dependent endocytosis of gold nanoparticles by surface-enhanced Raman scattering. Talanta 2021; 225:122071. [PMID: 33592789 DOI: 10.1016/j.talanta.2020.122071] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 12/15/2020] [Accepted: 12/27/2020] [Indexed: 01/02/2023]
Abstract
Endocytosis is a critical mechanism providing not only internalization of biomacromolecular structures but also communication with the environment where cells reside. Due to being the first step at the interaction interface, the route of cellular uptake has a major role governing the intracellular destinations and behaviors of molecular and non-molecular species including nanoparticles. To this end, various methods employing variety of techniques are investigated. In this study, surface-enhanced Raman spectroscopy (SERS) based approach for the investigation of endocytosis of gold nanoparticles (AuNPs) is reported. Internalization pathways of AuNPs were examined by flow cytometry via specific inhibitors for each endocytosis pathway type using three model cell lines Beas-2b, A549 and PNT1A. Macropinocytosis was blocked by cytochalasin D (CytoD), clathrin mediated endocytosis (CME) by sucrose (Scr), and caveolae mediated endocytosis (CE) by filipin (Fil). The results showed that cell type dependent AuNPs internalization affects not only the response of the cells to the inhibitors but also the obtained SERS spectra. SERS spectra of PNT1A cells treated with inhibitors was influenced most. The inhibition of each endocytosis pathway significantly affected the SERS spectral pattern and the spectral changes in different endocytosis pathways were clearly discriminated from each other. This means that SERS can significantly contribute to the investigation of different endosomal pathways from single living cells without any disruption of the cells or labeling.
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Affiliation(s)
- Deniz Yılmaz
- Yeditepe University, Faculty of Engineering, Department of Genetics and Bioengineering, 34755, Istanbul, Turkey
| | - Mustafa Culha
- Yeditepe University, Faculty of Engineering, Department of Genetics and Bioengineering, 34755, Istanbul, Turkey; Oregon Health and Science University, The Knight Cancer Research Institute, Cancer Early Detection Advanced Research (CEDAR) Center, Portland, OR 97239 USA; Sabanci University Nanotechnology Research and Application Center (SUNUM), Tuzla, Istanbul, 34956 Turkey.
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17
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18
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Zhao Q, Nenes A, Yu H, Song S, Xiao Z, Chen K, Shi G, Feng Y, Russell AG. Using High-Temporal-Resolution Ambient Data to Investigate Gas-Particle Partitioning of Ammonium over Different Seasons. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:9834-9843. [PMID: 32677824 DOI: 10.1021/acs.est.9b07302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Ammonium is one of the dominant inorganic water-soluble ions in fine particulate matter (PM2.5). In this study, source apportionment and thermodynamic equilibrium models were used to analyze the relationship between pH and the partitioning of ammonium (ε(NH4+)) using hourly ambient samples collected from Tianjin, China. We found a "Reversed-S curve" between pH and ε(NH4+) from the ambient hourly aerosol dataset when the theoretical ε(NO3-)* (an index identified in this work) was within specific ranges. A Boltzmann function was then used to fit the Reversed-S curve. For the summer data set, when ε(NO3-)* was between 0.7 and 0.8, the fitted R2 was 0.88. Through thermodynamic analysis, we found that the values of k[H+]2 (k = 3.08 × 104 L2 mol-2) and ε(NO3-)* can influence the pH-ε(NH4+) curve. Under certain situations, the values of k[H+]2 and ε(NO3-)* are similar to each other, and ε(NH4+) is sensitive to pH, suggesting that ε(NO3-)* plays an important role in affecting the ε(NH4+). During summer, winter, and spring seasons, when the relative humidity was greater than 0.36 and ε(NO3-)* was between 0.8 and 0.95, there was an obvious Reversed-S curve, with R2 = 0.60. The theoretical k[H+]2 and ε(NO3-)* developed in this work can be used to analyze the gas-particle partitioning of ammonia-ammonium and nitrate-nitric acid in the ambient atmosphere. Also, it is the first time that we created the joint source-NH3/HNO3 maps to integrate sources, aerosol pH and liquid water content, and ions (altogether in one map), which can provide useful information for designing effective strategies to control particulate matter pollution.
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Affiliation(s)
- Qianyu Zhao
- State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, P. R. China
| | - Athanasios Nenes
- School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
- Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas, Patras GR-26504, Greece
| | - Haofei Yu
- Department of Civil, Environmental and Construction Engineering, University of Central Florida, Orlando, Florida 32816, United States
| | - Shaojie Song
- School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Zhimei Xiao
- Tianjin Eco-Environmental Monitoring Center, Tianjin 300191, P. R. China
| | - Kui Chen
- Tianjin Eco-Environmental Monitoring Center, Tianjin 300191, P. R. China
| | - Guoliang Shi
- State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, P. R. China
| | - Yinchang Feng
- State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, P. R. China
| | - Armistead G Russell
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0512, United States
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19
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Wilson LT, Tipping WJ, Jamieson LE, Wetherill C, Henley Z, Faulds K, Graham D, Mackay SP, Tomkinson NCO. A new class of ratiometric small molecule intracellular pH sensors for Raman microscopy. Analyst 2020; 145:5289-5298. [PMID: 32672252 DOI: 10.1039/d0an00865f] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Intracellular pH (pHi) homeostasis is intertwined with a myriad of normal cellular behaviors as well as pathological processes. As such, small molecule probes for the measurement of pHi are invaluable tools for chemical biology, facilitating the study of the role of pH in cellular function and disease. The field of small molecule pHi sensors has traditionally been dominated with probes based on fluorescent scaffolds. In this study, a series of low molecular weight (<260) oligoyne compounds have been developed which exhibit pH sensitive alkyne stretching frequencies (νalkyne) in Raman spectroscopy. The modular design of the compounds enabled tuneability of their pKa(H) through simple structural modification, such that continuous pH sensitivity is achieved over the range 2-10. Alkyne stretching bands reside in the 'cell-silent' region of the Raman spectrum (1800-2600 cm-1) and are readily detectable in a cellular environment with subcellular spatial resolution. This enabled the application of a pH sensitive oligoyne compound to the ratiometric sensing of pHi in prostate cancer (PC3) cells in response to drug treatment. We propose that probes based on Alkyne Tag Raman Imaging offer an entirely new platform for the sensing of pHi, complementary to fluorescence microscopy.
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Affiliation(s)
- Liam T Wilson
- Department of Pure and Applied Chemistry, WestCHEM, Thomas Graham Building, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK.
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20
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Dumont E, De Bleye C, Haouchine M, Coïc L, Sacré PY, Hubert P, Ziemons E. Effect of the functionalisation agent on the surface-enhanced Raman scattering (SERS) spectrum: Case study of pyridine derivatives. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 233:118180. [PMID: 32163874 DOI: 10.1016/j.saa.2020.118180] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/17/2020] [Accepted: 02/19/2020] [Indexed: 06/10/2023]
Abstract
Nowadays, the use of functionalised surface-enhanced Raman scattering (SERS) substrates has become common. These surface modifying agents notably act as Raman reporters, as sensors of biological processes (pH, redox probes) or to increase the sensitivity and/or the specificity of SERS detections. However, the effects of the functionalisation agents are deeply examined in very few studies, even though they can affect the aggregation behaviour of the SERS substrate. Moreover, depending on their concentration and on the pH, their spectral signature can be modified and they can even degrade if stored inappropriately. In this context, this paper aims at emphasising the importance of the different aspects previously listed in the selection of a functionalisation agent. Pyridine derivatives were picked out to highlight these parameters, as some of these compounds are commonly used to be grafted onto SERS substrates. Two widespread syntheses of nanoparticles were selected as SERS substrates: citrate-reduced gold and silver nanoparticles. The surface of the nanoparticles was functionalised with several pyridine derivatives at different concentrations and in several solvents. It was observed that the molecules under study had a concentration-dependent effect on nanoparticle aggregation. A stability study was furthermore conducted in order to determine the best preservation conditions of the grafting solutions. In conclusion, this paper shines a light on the relevance of the investigation of the too-often neglected behaviour of the surface modifying agents. Before their application in SERS analyses, parameters such as the label concentration should therefore be included in an experimental design to optimise the sample preparation.
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Affiliation(s)
- Elodie Dumont
- University of Liege (ULiege), CIRM, VibraSanté Hub, Department of Pharmacy, Laboratory of Pharmaceutical Analytical Chemistry, CHU, B36, B-4000, Liege, Belgium.
| | - Charlotte De Bleye
- University of Liege (ULiege), CIRM, VibraSanté Hub, Department of Pharmacy, Laboratory of Pharmaceutical Analytical Chemistry, CHU, B36, B-4000, Liege, Belgium
| | - Merzouk Haouchine
- University of Liege (ULiege), CIRM, VibraSanté Hub, Department of Pharmacy, Laboratory of Pharmaceutical Analytical Chemistry, CHU, B36, B-4000, Liege, Belgium
| | - Laureen Coïc
- University of Liege (ULiege), CIRM, VibraSanté Hub, Department of Pharmacy, Laboratory of Pharmaceutical Analytical Chemistry, CHU, B36, B-4000, Liege, Belgium
| | - Pierre-Yves Sacré
- University of Liege (ULiege), CIRM, VibraSanté Hub, Department of Pharmacy, Laboratory of Pharmaceutical Analytical Chemistry, CHU, B36, B-4000, Liege, Belgium
| | - Philippe Hubert
- University of Liege (ULiege), CIRM, VibraSanté Hub, Department of Pharmacy, Laboratory of Pharmaceutical Analytical Chemistry, CHU, B36, B-4000, Liege, Belgium
| | - Eric Ziemons
- University of Liege (ULiege), CIRM, VibraSanté Hub, Department of Pharmacy, Laboratory of Pharmaceutical Analytical Chemistry, CHU, B36, B-4000, Liege, Belgium
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21
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Kapara A, Brunton V, Graham D, Faulds K. Investigation of cellular uptake mechanism of functionalised gold nanoparticles into breast cancer using SERS. Chem Sci 2020; 11:5819-5829. [PMID: 34094083 PMCID: PMC8159335 DOI: 10.1039/d0sc01255f] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Accepted: 05/20/2020] [Indexed: 01/04/2023] Open
Abstract
Gold nanoparticles (AuNPs) are widely used in various applications such as cancer imaging and drug delivery. The functionalisation of AuNPs has been shown to affect their cellular internalisation, accumulation and targeting efficiency. The mechanism of cellular uptake of functionalised AuNPs by different cancer cells is not well understood. Therefore, a detailed understanding of the molecular processes is necessary to improve AuNPs for their selective uptake and fate in specific cellular systems. This knowledge can greatly help in designing nanotags with higher cellular uptake for more selective and specific targeting capabilities with less off-target effects. Here, we demonstrate for the first time a straightforward and non-destructive 3D surface enhanced Raman spectroscopy (SERS) imaging approach to track the cellular uptake and localisation of AuNPs functionalised with an anti-ERα (estrogen receptor alpha) antibody in MCF-7 ERα-positive human breast cancer cells under different conditions including temperature and dynamin inhibition. 3D SERS enabled information rich monitoring of the intracellular internalisation of the SERS nanotags. It was found that ERα-AuNPs were internalised by MCF-7 cells in a temperature-dependent manner suggesting an active endocytosis-dependent mechanism. 3D SERS cell mapping also indicated that the nanotags entered MCF-7 cells using dynamin dependent endocytosis, since dynamin inhibition resulted in the SERS signal being obtained from, or close to, the cell surface rather than inside the cells. Finally, ERα-AuNPs were found to enter MCF-7 cells using an ERα receptor-mediated endocytosis process. This study addresses the role of functionalisation of SERS nanotags in biological environments and highlights the benefits of using 3D SERS for the investigation of cellular uptake processes.
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Affiliation(s)
- Anastasia Kapara
- Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde 99 George Street Glasgow Scotland G1 1RD UK
- Edinburgh Cancer Research UK Centre, University of Edinburgh Crewe Road South Edinburgh Scotland EH4 2XU UK
| | - Valerie Brunton
- Edinburgh Cancer Research UK Centre, University of Edinburgh Crewe Road South Edinburgh Scotland EH4 2XU UK
| | - Duncan Graham
- Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde 99 George Street Glasgow Scotland G1 1RD UK
| | - Karen Faulds
- Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde 99 George Street Glasgow Scotland G1 1RD UK
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22
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Law SM, Stanfield SJ, Hardisty GR, Dransfield I, Campbell CJ, Gray RD. Human cystic fibrosis monocyte derived macrophages display no defect in acidification of phagolysosomes when measured by optical nanosensors. J Cyst Fibros 2020; 19:203-210. [PMID: 31501051 DOI: 10.1016/j.jcf.2019.09.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 09/03/2019] [Accepted: 09/03/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND Defective macrophage phagolysosomal acidification is implicated in numerous lung diseases including Cystic Fibrosis (CF) and may contribute to defective pathogen killing. Conflicting reports relating to phagolysosomal pH in CF macrophages have been published, in part related to the use of pH-sensitive fluorescent probes where potential inadequacies in experimental design can be a contributing factor (e.g. employing probes with incorrect pKa for the cellular compartment of interest). We developed a reliable method to quantify macrophage phagolysosomal pH using surface-enhanced Raman spectroscopy-based nanosensors. METHODS Monocyte-derived macrophages from CF and healthy control participants were incubated with nanosensors. Live cell imaging identified phagocytosed nanosensors, and surface-enhanced Raman spectroscopy was performed using para-mercaptobenzoic acid functionalised gold nanoparticles which produce Raman spectra that change predictably with their environmental pH. Conventional fluorescence spectroscopy was carried out in comparison. Nanosensor localisation to phagolysosomes was confirmed by transmission electron microscopy. RESULTS Nanosensors were actively phagocytosed by macrophages into phagolysosomes and acidification occurred rapidly and remained stable for at least 60 min. There was no difference in phagolysosomal pH between healthy control and CF macrophages (5.41 ± 0.11 vs. 5.41 ± 0.20, p > .9999), further confirmed by inhibiting Cystic Fibrosis Transmembrane Conductance Regulator in healthy control monocyte-derived macrophages. CONCLUSIONS Optical nanosensors accurately measure macrophage phagolysosomal pH and demonstrate no phagolysosomal acidification defect in human CF monocyte-derived macrophages. Further studies using alveolar macrophages could extend the impact of our findings. Nanosensors represent a novel and precise means to measure organelle functions with widespread potential for the study and monitoring of several lung diseases.
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Affiliation(s)
- Sheonagh M Law
- Centre for Inflammation Research, The Queen's Medical Research Institute, 47 Little France Crescent, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Samuel J Stanfield
- Joseph Black Building, The University of Edinburgh, David Brewster Rd, Edinburgh EH9 3FJ, UK
| | - Gareth R Hardisty
- Centre for Inflammation Research, The Queen's Medical Research Institute, 47 Little France Crescent, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Ian Dransfield
- Centre for Inflammation Research, The Queen's Medical Research Institute, 47 Little France Crescent, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Colin J Campbell
- Joseph Black Building, The University of Edinburgh, David Brewster Rd, Edinburgh EH9 3FJ, UK
| | - Robert D Gray
- Centre for Inflammation Research, The Queen's Medical Research Institute, 47 Little France Crescent, The University of Edinburgh, Edinburgh EH16 4TJ, UK.
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23
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Chang P, Chen Z, Zhang Y, Liu Y. Direct measurement of aerosol pH in individual malonic acid and citric acid droplets under different relative humidity conditions via Raman spectroscopy. CHEMOSPHERE 2020; 241:124960. [PMID: 31590017 DOI: 10.1016/j.chemosphere.2019.124960] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 09/14/2019] [Accepted: 09/23/2019] [Indexed: 06/10/2023]
Abstract
Acidity of aerosol particles plays important roles in atmospheric chemistry, in turn, impacting climate system and public health. Current knowledge of acidity in atmosphere aerosols remains fairly scarce largely because of difficulty in direct measurement. On the other hand, indirect methods for estimating aerosol pH are often inconsistent with pH values predicted by thermodynamic models. Recently, a direct Raman spectroscopy method has been reported to determine pH values of acid-conjugate base equilibria systems based on Raman intensity of distinct characteristic peaks of conjugate acid-base pair. Nevertheless, for pure carboxylic acid aerosol particles, such as malonic acid (MA), characteristic peak of its conjugate base cannot be clearly observed in Raman spectra owing to small Ka value (weak acid dissociation constant), which leads to little dissociation of weak acid and low concentration of its conjugated base. As a result, pH of carboxylic acid particles cannot be directly determined by calibrating concentrations of acid and its conjugated base using the above-mentioned method. To address such an issue, we demonstrate a new approach for determining pH values of malonic acid (MA) and citric acid (CA) droplets under different relative humidity (RH) based on calibration curves. We measure Raman intensity ratios of acid solutions at different concentrations and their pH values to establish a calibration curve, and then using the intensity ratio of MA and CA droplets under different RH to determine aerosol particle pH based on calibration curves. Results have shown that aerosol pH of MA droplet decreases with a decreasing RH and pH values ranges from 1.03 to -0.12, when RH value is reduced from 90% to 26%, in good agreement with model prediction values. In addition, we also, for the first time, report pH values of CA droplets under different RH conditions and its pH values range from 1.13 to -0.74 when RH is reduced from 91% to 28%.
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Affiliation(s)
- Pianpian Chang
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, PR China
| | - Zhe Chen
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, PR China
| | - Yunhong Zhang
- The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, PR China.
| | - Yong Liu
- Department of Chemistry, University of Colorado Denver, Denver, CO, 80217, USA.
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24
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Guo H, Huang Q, Leng W, Zhan Y, Behkam B, Willner MR, Wei H, Marr LC, Vikesland PJ. Bromide ion-functionalized nanoprobes for sensitive and reliable pH measurement by surface-enhanced Raman spectroscopy. Analyst 2019; 144:7326-7335. [PMID: 31663525 DOI: 10.1039/c9an01699f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
4-Mercaptopyridine (4-Mpy) is a pH reporter molecule commonly used to functionalize nanoprobes for surface-enhanced Raman spectroscopy (SERS) based pH measurements. However, nanoprobes functionalized by 4-Mpy alone have low pH sensitivity and are subject to interference by halide ions in sample media. To improve nanoprobe pH sensitivity and reliability, we functionalized gold nanoparticles (AuNPs) with both 4-Mpy and bromide ion (Br-). Br- electrostatically stabilizes protonated 4-Mpy, thus enabling sensitive SERS detection of the protonation state of 4-Mpy as a function of pH while also reducing variability caused by external halide ions. Through optimization of the functionalization parameters, including suspension pH, [4-Mpy], and [Br-], the developed nanoprobes enable monitoring of pH from 2.1 to 10 with high SERS activity and minimal interference from halide ions within the sample matrix. As a proof of concept, we were able to track nanoprobe location and image the pH distribution inside individual cancer cells. This study provides a novel way to engineer reliable 4-Mpy-functionalized SERS nanoprobes for the sensitive analysis of spatially localized pH features in halide ion-containing microenvironments.
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Affiliation(s)
- Huiyuan Guo
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, USA. and Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center (VTSuN), Blacksburg, Virginia, USA
| | - Qishen Huang
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, USA. and Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center (VTSuN), Blacksburg, Virginia, USA and Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, North Carolina, USA
| | - Weinan Leng
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, USA. and Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center (VTSuN), Blacksburg, Virginia, USA and Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, North Carolina, USA
| | - Ying Zhan
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia, USA
| | - Bahareh Behkam
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia, USA
| | - Marjorie R Willner
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, USA. and Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center (VTSuN), Blacksburg, Virginia, USA and Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, North Carolina, USA
| | - Haoran Wei
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, USA. and Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center (VTSuN), Blacksburg, Virginia, USA and Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, North Carolina, USA
| | - Linsey C Marr
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, USA. and Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center (VTSuN), Blacksburg, Virginia, USA and Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, North Carolina, USA
| | - Peter J Vikesland
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, USA. and Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center (VTSuN), Blacksburg, Virginia, USA and Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, North Carolina, USA
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25
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Intracellular redox potential is correlated with miRNA expression in MCF7 cells under hypoxic conditions. Proc Natl Acad Sci U S A 2019; 116:19753-19759. [PMID: 31506353 DOI: 10.1073/pnas.1909455116] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Hypoxia is a ubiquitous feature of cancers, encouraging glycolytic metabolism, proliferation, and resistance to therapy. Nonetheless, hypoxia is a poorly defined term with confounding features described in the literature. Redox biology provides an important link between the external cellular microenvironment and the cell's response to changing oxygen pressures. In this paper, we demonstrate a correlation between intracellular redox potential (measured using optical nanosensors) and the concentrations of microRNAs (miRNAs) involved in the cell's response to changes in oxygen pressure. The correlations were established using surprisal analysis (an approach derived from thermodynamics and information theory). We found that measured redox potential changes reflect changes in the free energy computed by surprisal analysis of miRNAs. Furthermore, surprisal analysis identified groups of miRNAs, functionally related to changes in proliferation and metastatic potential that played the most significant role in the cell's response to changing oxygen pressure.
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26
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Zhao H, Zhang Y, Pan M, Song Y, Bai L, Miao Y, Huang Y, Zhu X, Song CP. Dynamic imaging of cellular pH and redox homeostasis with a genetically encoded dual-functional biosensor, pHaROS, in yeast. J Biol Chem 2019; 294:15768-15780. [PMID: 31488545 PMCID: PMC6816096 DOI: 10.1074/jbc.ra119.007557] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 08/25/2019] [Indexed: 11/06/2022] Open
Abstract
Intracellular pH and redox states are critical for multiple processes and partly determine cell behavior. Here, we developed a genetically encoded dual-function probe, named p H and redox-sensitive fluorescent protein (pHaROS), for simultaneous real-time detection of changes in redox potential and pH in living cells. pHaROS consists of the Arabidopsis flavin mononucleotide-binding fluorescent protein iLOV and an mKATE variant, mBeRFP. Using pHaROS in Saccharomyces cerevisiae cells, we confirmed that H2O2 raises the overall redox potential of the cell and found that this increase is accompanied by a decrease in cytosolic pH. Furthermore, we observed spatiotemporal pH and redox homeostasis within the nucleus at various stages of the cell cycle in budding yeast (Saccharomyces cerevisiae) during cellular development and responses to oxidative stress. Importantly, we could tailor pHaROS to specific applications, including measurements in different organelles and cell types and the GSH/GSSG ratio, highlighting pHaROS's high flexibility and versatility. In summary, we have developed pHaROS as a dual-function probe that can be used for simultaneously measuring cellular pH and redox potential, representing a very promising tool for determining the cross-talk between intracellular redox- and pH-signaling processes in yeast and mammalian U87 cell.
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Affiliation(s)
- Hang Zhao
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
| | - Yu Zhang
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
| | - Mingming Pan
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
| | - Yichen Song
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
| | - Ling Bai
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
| | - Yuchen Miao
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
| | - Yanqin Huang
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
| | - Xiaohong Zhu
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
| | - Chun-Peng Song
- Department of Biology, Institute of Plant Stress Biology, State Key Laboratory of Cotton Biology, Henan University, Kaifeng, China 475001
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27
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Gardner B, Matousek P, Stone N. Subsurface Chemically Specific Measurement of pH Levels in Biological Tissues Using Combined Surface-Enhanced and Deep Raman. Anal Chem 2019; 91:10984-10987. [PMID: 31322859 PMCID: PMC7006966 DOI: 10.1021/acs.analchem.9b01015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
![]()
There
is much interest in using nanosensors to monitor biologically
relevant species such as glucose, or cellular pH, as these often become
dysregulated in diseases such as cancer. This information is often
inaccessible at depth in biological tissue, due to the highly scattering
nature of tissue. Here we show that gold nanoparticles labeled with
pH-sensitive reporter molecules can monitor pH at depth in biological
tissues. This was achieved using deep Raman spectroscopy (spatially
offset Raman and transmission Raman) in combination with surface-enhanced
Raman spectroscopy, allowing chemical information to be retrieved
significantly deeper than conventional Raman spectroscopy permits.
Combining these approaches with chemometrics enabled pH changes to
be monitored with an error of ±∼0.1 pH units noninvasively
through 22 mm of soft tissue. This development opens the opportunity
for the next generation of light-based medical diagnostic methods,
such as monitoring of cancers, known to significantly alter pH levels.
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Affiliation(s)
- Benjamin Gardner
- Biomedical Physics, School of Physics and Astronomy, College of Engineering, Mathematics and Physical Sciences , University of Exeter , Exeter , EX4 4QL , United Kingdom
| | - Pavel Matousek
- Central Laser Facility, Research Complex at Harwell , STFC Rutherford Appleton Laboratory , Harwell Oxford , OX11 0QX , United Kingdom
| | - Nicholas Stone
- Biomedical Physics, School of Physics and Astronomy, College of Engineering, Mathematics and Physical Sciences , University of Exeter , Exeter , EX4 4QL , United Kingdom
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28
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Wu D, Chen Y, Hou S, Fang W, Duan H. Intracellular and Cellular Detection by SERS-Active Plasmonic Nanostructures. Chembiochem 2019; 20:2432-2441. [PMID: 30957950 DOI: 10.1002/cbic.201900191] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Indexed: 12/16/2022]
Abstract
Surface-enhanced Raman scattering (SERS), with greatly amplified fingerprint spectra, holds great promise in biochemical and biomedical research. In particular, the possibility of exciting a library of SERS probes and differentially detecting them simultaneously has stimulated widespread interest in multiplexed biodetection. Herein, recent progress in developing SERS-active plasmonic nanostructures for cellular and intracellular detection is summarized. The development of nanosensors with tailored plasmonic and multifunctional properties for profiling molecular and pathological processes is highlighted. Future challenges towards the routine use of SERS technology in quantitative bioanalysis and clinical diagnostics are further discussed.
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Affiliation(s)
- Di Wu
- Department of Chemistry, Zhejiang University, Hangzhou, 310028, P.R. China.,School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457, Singapore
| | - Yonghao Chen
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457, Singapore
| | - Shuai Hou
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457, Singapore
| | - Wenjun Fang
- Department of Chemistry, Zhejiang University, Hangzhou, 310028, P.R. China
| | - Hongwei Duan
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457, Singapore
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29
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Kim E, Li J, Kang M, Kelly DL, Chen S, Napolitano A, Panzella L, Shi X, Yan K, Wu S, Shen J, Bentley WE, Payne GF. Redox Is a Global Biodevice Information Processing Modality. PROCEEDINGS OF THE IEEE. INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS 2019; 107:1402-1424. [PMID: 32095023 PMCID: PMC7036710 DOI: 10.1109/jproc.2019.2908582] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Biology is well-known for its ability to communicate through (i) molecularly-specific signaling modalities and (ii) a globally-acting electrical modality associated with ion flow across biological membranes. Emerging research suggests that biology uses a third type of communication modality associated with a flow of electrons through reduction/oxidation (redox) reactions. This redox signaling modality appears to act globally and has features of both molecular and electrical modalities: since free electrons do not exist in aqueous solution, the electrons must flow through molecular intermediates that can be switched between two states - with electrons (reduced) or without electrons (oxidized). Importantly, this global redox modality is easily accessible through its electrical features using convenient electrochemical instrumentation. In this review, we explain this redox modality, describe our electrochemical measurements, and provide four examples demonstrating that redox enables communication between biology and electronics. The first two examples illustrate how redox probing can acquire biologically relevant information. The last two examples illustrate how redox inputs can transduce biologically-relevant transitions for patterning and the induction of a synbio transceiver for two-hop molecular communication. In summary, we believe redox provides a unique ability to bridge bio-device communication because simple electrochemical methods enable global access to biologically meaningful information. Further, we envision that redox may facilitate the application of information theory to the biological sciences.
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Affiliation(s)
- Eunkyoung Kim
- Institute for Bioscience & Biotechnology Research, University of Maryland, College Park, MD 20742, USA
| | - Jinyang Li
- Institute for Bioscience & Biotechnology Research, Fischell Department of Bioengineering University of Maryland, College Park, MD 20742, USA
| | - Mijeong Kang
- Institute for Bioscience & Biotechnology Research, University of Maryland, College Park, MD 20742, USA
| | - Deanna L Kelly
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD 21228, USA
| | - Shuo Chen
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD 21228, USA
| | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Naples, Italy
| | - Lucia Panzella
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Naples, Italy
| | - Xiaowen Shi
- School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry, Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China
| | - Kun Yan
- School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry, Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China
| | - Si Wu
- School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry, Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China
| | - Jana Shen
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA
| | - William E Bentley
- Institute for Bioscience & Biotechnology Research, Fischell Department of Bioengineering University of Maryland, College Park, MD 20742, USA
| | - Gregory F Payne
- Institute for Bioscience & Biotechnology Research, University of Maryland, College Park, MD 20742, USA
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30
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Capocefalo A, Mammucari D, Brasili F, Fasolato C, Bordi F, Postorino P, Domenici F. Exploring the Potentiality of a SERS-Active pH Nano-Biosensor. Front Chem 2019; 7:413. [PMID: 31231638 PMCID: PMC6568054 DOI: 10.3389/fchem.2019.00413] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 05/20/2019] [Indexed: 01/05/2023] Open
Abstract
The merging of the molecular specificity of Raman spectroscopy with the extraordinary optical properties of metallic nanoarchitectures is at the heart of Surface Enhanced Raman Spectroscopy (SERS), which in the last few decades proved its worth as powerful analytical tool with detection limits pushed to the single molecule recognition. Within this frame, SERS-based nanosensors for localized pH measurements have been developed and employed for a wide range of applications. Nevertheless, to improve the performances of such nanosensors, many key issues concerning their assembling, calibration and stability, that could significantly impact on the outcome of the pH measurements, need to be clarified. Here, we report on the detailed characterization of a case study SERS-active pH nanosensor, based on the conjugation of gold nanoparticles with the pH-sensitive molecular probe 4-mercaptobenzoic acid (4MBA). We analyzed and optimized all the aspects of the synthesis procedure and of the operating conditions to preserve the sensor stability and provide the highest responsiveness to pH. Exploiting the dependence of the SERS spectrum on the protonation degree of the carboxylic group at the edge of the 4MBA molecules, we derived a calibration curve for the nanosensor. The extrapolated working point, i.e., the pH value corresponding to the highest sensitivity, falls at pH 5.6, which corresponds to the pKa value of the molecule confined at the nanoparticle surface. A shift of the pKa of 4MBA, observed on the molecules confined at the nanostructured interface respect to the bulk counterpart, unveils the opportunity to assembly a SERS-based pH nanosensor with the ability to select its working point in the sensitivity region of interest, by acting on the nanostructured surface on which the molecular probe is confined. As a proof-of-concept, the nanosensor was successfully employed to measure the extracellular pH of normal and cancer cells, demonstrating the capability to discriminate between them.
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Affiliation(s)
| | - Daisy Mammucari
- Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
| | - Francesco Brasili
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Rome, Italy
| | - Claudia Fasolato
- Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
- Dipartimento di Fisica e Geologia, Università di Perugia, Perugia, Italy
| | - Federico Bordi
- Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
| | - Paolo Postorino
- Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
| | - Fabio Domenici
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Rome, Italy
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31
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Czaja T, Wójcik K, Grzeszczuk M, Szostak R. Polypyrrole⁻Methyl Orange Raman pH Sensor. Polymers (Basel) 2019; 11:E715. [PMID: 31010147 PMCID: PMC6523554 DOI: 10.3390/polym11040715] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/15/2019] [Accepted: 04/16/2019] [Indexed: 11/28/2022] Open
Abstract
An easy-to-prepare pH sensor based on electrochemically obtained polypyrrole doped with methyl orange ions is described. It enables the determination of a pH value in the 3-13 range for volumes below 1 µL. In a wide pH range, resonance and pre-resonance methyl orange Raman spectra, excited with the 514.5 nm line of an Ar+ laser, changed noticeably in function of H+ concentration. Two types of measurements were performed. In the first case, Raman spectra of the analyzed solutions were collected for samples placed on the sensor surface using a confocal microscope equipped with a 10x objective. Next, measurements were conducted for the same samples without the sensor. On the basis of these spectra, partial least-squares models were elaborated and validated. Relative standard errors of prediction for calibration, validation, and test samples were found to be in the 3.7%-3.9% range. An analogous model build using spectra registered without the sensor was characterized by slightly worse parameters.
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Affiliation(s)
- Tomasz Czaja
- Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Kamil Wójcik
- Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Maria Grzeszczuk
- Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Roman Szostak
- Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
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32
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Pan C, Li X, Sun J, Li Z, Zhang L, Qian W, Wang P, Dong J. A Multiplexed SERS-Active Microneedle for Simultaneous Redox Potential and pH Measurements in Rat Joints. ACS APPLIED BIO MATERIALS 2019; 2:2102-2108. [DOI: 10.1021/acsabm.9b00117] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chenyan Pan
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
| | - Xiaochen Li
- Department of Orthopedics and Traumatology, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, 210029, China
| | - Jie Sun
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
| | - Zhe Li
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
| | - Li Zhang
- Department of Orthopedics and Traumatology, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, 210029, China
| | - Weiping Qian
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
| | - Peimin Wang
- Department of Orthopedics and Traumatology, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, 210029, China
| | - Jian Dong
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
- Laboratory of Environment and Biosafety, Research Institute of Southeast University in Suzhou, Suzhou, 215123, China
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33
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Shi X, Nenes A, Xiao Z, Song S, Yu H, Shi G, Zhao Q, Chen K, Feng Y, Russell AG. High-Resolution Data Sets Unravel the Effects of Sources and Meteorological Conditions on Nitrate and Its Gas-Particle Partitioning. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:3048-3057. [PMID: 30793889 DOI: 10.1021/acs.est.8b06524] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nitrate is one of the most abundant inorganic water-soluble ions in fine particulate matter (PM2.5). However, the formation mechanism of nitrate in the ambient atmosphere, especially the impacts of its semivolatility and the various existing forms of nitrogen, remain under-investigated. In this study, hourly ambient observations of speciated PM2.5 components (NO3-, SO42-, etc.) were collected in Tianjin, China. Source contributions were analyzed by PMF/ME2 (Positive Matrix Factorization using the Multilinear Engine 2) program, and pH were estimated by ISORROPIA-II, to investigate the relationship between pH and nitrate. Five sources (factors) were resolved: secondary sulfate (SS), secondary nitrate (SN), dust, vehicle and coal combustion. SN and pH showed a triangle-shaped relationship. When SS was high, the fraction of nitrate partitioning into the aerosol phase exhibits a characteristic "S-curve" relationship with pH for different seasons. An index ( ITL) is developed and combined with pH to explore the sensitive regions of "S-curve". Controlling the emissions of anions (SO42-, Cl-), cations (Ca2+, Mg2+, etc.) and gases (NO x, NH3, SO2, etc.) will change pH, potentially reducing or increasing SN. The findings of this work provide an effective approach for exploring the formation mechanisms of nitrate under different influencing factors (sources, pH, and IRL).
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Affiliation(s)
- Xurong Shi
- State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering , Nankai University , Tianjin , 300071 , China
| | - Athanasios Nenes
- Laboratory of Atmospheric Processes and their Impacts, School of Architecture, Civil and Environmental Engineering , École Polytechnique Fédérale de Lausanne , Lausanne , CH-1015 , Switzerland
- Institute of Chemical Engineering Sciences , Foundation for Research and Technology Hellas , Patras , Greece , GR-26504
- Institute for Environmental Research and Sustainable Development , National Observatory of Athens , Palea Penteli , Greece GR-15236
| | - Zhimei Xiao
- Tianjin Eco-Environmental Monitoring Center , Tianjin , 300191 , China
| | - Shaojie Song
- School of Engineering and Applied Sciences , Harvard University , Cambridge , Massachusetts 02138 , United States
| | - Haofei Yu
- Department of Civil, Environmental and Construction Engineering , University of Central Florida , Orlando , Florida 32816 , United States
| | - Guoliang Shi
- State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering , Nankai University , Tianjin , 300071 , China
| | - Qianyu Zhao
- State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering , Nankai University , Tianjin , 300071 , China
| | - Kui Chen
- Tianjin Eco-Environmental Monitoring Center , Tianjin , 300191 , China
| | - Yinchang Feng
- State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering , Nankai University , Tianjin , 300071 , China
| | - Armistead G Russell
- School of Civil and Environmental Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332-0512 , United States
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34
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Zhang Z, Bando K, Mochizuki K, Taguchi A, Fujita K, Kawata S. Quantitative Evaluation of Surface-Enhanced Raman Scattering Nanoparticles for Intracellular pH Sensing at a Single Particle Level. Anal Chem 2019; 91:3254-3262. [PMID: 30698014 DOI: 10.1021/acs.analchem.8b03276] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Intracellular pH is one of the key factors for understanding various biological processes in biological cells. Plasmonic gold and silver nanoparticles (NPs) have been extensively studied for surface-enhanced Raman scattering (SERS) applications for pH sensing as a local pH probe in a living cell. However, the SERS performance of NPs depends on material, size, and shape, which can be controlled by chemical synthesis. Here, we synthesized 18 types of gold and silver NPs with different morphologies such as sphere, rod, flower, star, core/shell, hollow, octahedra, core/satellites, and chainlike aggregates, and quantitatively compared their SERS performance for pH sensing. The SERS intensity from the most commonly utilized SERS probe molecule ( para-mercaptobenzoic acid, p-MBA) for pH sensing was measured at the single nanoparticle level under the same measurement parameters such as low laser power (0.5 mW/μm2), short integration time (100 ms) at wavelengths of 405, 488, 532, 584, 676, and 785 nm. In our measurement, the Ag chain, Ag core/satellites, Ag@Au core/satellites, and Au core/satellites nanoassemblies showed efficient pH sensing at the single particle level. By using p-MBA-conjugated Au@Ag core/satellites, we performed time-lapse pH measurements during apoptosis of HeLa cells. These experimental results confirmed that the pH measurement using p-MBA-conjugated Au@Ag core/satellites can be applied for long-term measurements of intracellular pH during cellular events.
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Affiliation(s)
- Zhiqiang Zhang
- Department of Applied Physics , Osaka University , Suita , Osaka 565-0871 , Japan.,CAS Key Lab of Bio-Medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology , Chinese Academy of Sciences , 215163 , Suzhou , China
| | - Kazuki Bando
- Department of Applied Physics , Osaka University , Suita , Osaka 565-0871 , Japan.,Serendip Research, Osaka , Osaka 530-0001 , Japan
| | - Kentaro Mochizuki
- Department of Applied Physics , Osaka University , Suita , Osaka 565-0871 , Japan
| | - Atsushi Taguchi
- Department of Applied Physics , Osaka University , Suita , Osaka 565-0871 , Japan
| | - Katsumasa Fujita
- Department of Applied Physics , Osaka University , Suita , Osaka 565-0871 , Japan.,Advanced Photonics and Biosensing Open Innovation Laboratory , AIST-Osaka Unversity , Suita , Osaka 565-0871 , Japan.,Institute for Open and Transdisciplinary Research Initiatives , Osaka University , Suita , Osaka 565-0871 , Japan
| | - Satoshi Kawata
- Department of Applied Physics , Osaka University , Suita , Osaka 565-0871 , Japan.,Serendip Research, Osaka , Osaka 530-0001 , Japan
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35
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Taylor J, Huefner A, Li L, Wingfield J, Mahajan S. Nanoparticles and intracellular applications of surface-enhanced Raman spectroscopy. Analyst 2018; 141:5037-55. [PMID: 27479539 PMCID: PMC5048737 DOI: 10.1039/c6an01003b] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Surface-enhanced Raman spectrocopy (SERS) offers ultrasensitive vibrational fingerprinting at the nanoscale. Its non-destructive nature affords an ideal tool for interrogation of the intracellular environment, detecting the localisation of biomolecules, delivery and monitoring of therapeutics and for characterisation of complex cellular processes at the molecular level. Innovations in nanotechnology have produced a wide selection of novel, purpose-built plasmonic nanostructures capable of high SERS enhancement for intracellular probing while microfluidic technologies are being utilised to reproducibly synthesise nanoparticle (NP) probes at large scale and in high throughput. Sophisticated multivariate analysis techniques unlock the wealth of previously unattainable biomolecular information contained within large and multidimensional SERS datasets. Thus, with suitable combination of experimental techniques and analytics, SERS boasts enormous potential for cell based assays and to expand our understanding of the intracellular environment. In this review we trace the pathway to utilisation of nanomaterials for intracellular SERS. Thus we review and assess nanoparticle synthesis methods, their toxicity and cell interactions before presenting significant developments in intracellular SERS methodologies and how identified challenges can be addressed.
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Affiliation(s)
- Jack Taylor
- Department of Chemistry and Institute of Life Sciences (IfLS), University of Southampton, SO17 1BJ, UK.
| | - Anna Huefner
- Department of Chemistry and Institute of Life Sciences (IfLS), University of Southampton, SO17 1BJ, UK. and Sector for Biological and Soft Systems, Cavendish Laboratory, Department of Physics, University of Cambridge, 19 JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Li Li
- Department of Chemistry and Institute of Life Sciences (IfLS), University of Southampton, SO17 1BJ, UK.
| | - Jonathan Wingfield
- Discovery Sciences, Screening and Compound Management, AstraZeneca, Unit 310 - Darwin Building, Cambridge Science Park, Milton Road, Cambridge, CB4 0WG, UK
| | - Sumeet Mahajan
- Department of Chemistry and Institute of Life Sciences (IfLS), University of Southampton, SO17 1BJ, UK.
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Joseph MM, Narayanan N, Nair JB, Karunakaran V, Ramya AN, Sujai PT, Saranya G, Arya JS, Vijayan VM, Maiti KK. Exploring the margins of SERS in practical domain: An emerging diagnostic modality for modern biomedical applications. Biomaterials 2018; 181:140-181. [PMID: 30081304 DOI: 10.1016/j.biomaterials.2018.07.045] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 07/16/2018] [Accepted: 07/25/2018] [Indexed: 12/30/2022]
Abstract
Excellent multiplexing capability, molecular specificity, high sensitivity and the potential of resolving complex molecular level biological compositions augmented the diagnostic modality of surface-enhanced Raman scattering (SERS) in biology and medicine. While maintaining all the merits of classical Raman spectroscopy, SERS provides a more sensitive and selective detection and quantification platform. Non-invasive, chemically specific and spatially resolved analysis facilitates the exploration of SERS-based nano probes in diagnostic and theranostic applications with improved clinical outcomes compared to the currently available so called state-of-art technologies. Adequate knowledge on the mechanism and properties of SERS based nano probes are inevitable in utilizing the full potential of this modality for biomedical applications. The safety and efficiency of metal nanoparticles and Raman reporters have to be critically evaluated for the successful translation of SERS in to clinics. In this context, the present review attempts to give a comprehensive overview about the selected medical, biomedical and allied applications of SERS while highlighting recent and relevant outcomes ranging from simple detection platforms to complicated clinical applications.
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Affiliation(s)
- Manu M Joseph
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Nisha Narayanan
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST, Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Jyothi B Nair
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST, Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Varsha Karunakaran
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST, Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Adukkadan N Ramya
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST, Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Palasseri T Sujai
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST, Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Giridharan Saranya
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST, Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Jayadev S Arya
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST, Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Vineeth M Vijayan
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India
| | - Kaustabh Kumar Maiti
- Chemical Sciences and Technology Division, CSIR- National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Pappanamcode, Thiruvananthapuram, Kerala 695019, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST, Pappanamcode, Thiruvananthapuram, Kerala 695019, India.
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Zong C, Xu M, Xu LJ, Wei T, Ma X, Zheng XS, Hu R, Ren B. Surface-Enhanced Raman Spectroscopy for Bioanalysis: Reliability and Challenges. Chem Rev 2018; 118:4946-4980. [PMID: 29638112 DOI: 10.1021/acs.chemrev.7b00668] [Citation(s) in RCA: 834] [Impact Index Per Article: 139.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Surface-enhanced Raman spectroscopy (SERS) inherits the rich chemical fingerprint information on Raman spectroscopy and gains sensitivity by plasmon-enhanced excitation and scattering. In particular, most Raman peaks have a narrow width suitable for multiplex analysis, and the measurements can be conveniently made under ambient and aqueous conditions. These merits make SERS a very promising technique for studying complex biological systems, and SERS has attracted increasing interest in biorelated analysis. However, there are still great challenges that need to be addressed until it can be widely accepted by the biorelated communities, answer interesting biological questions, and solve fatal clinical problems. SERS applications in bioanalysis involve the complex interactions of plasmonic nanomaterials with biological systems and their environments. The reliability becomes the key issue of bioanalytical SERS in order to extract meaningful information from SERS data. This review provides a comprehensive overview of bioanalytical SERS with the main focus on the reliability issue. We first introduce the mechanism of SERS to guide the design of reliable SERS experiments with high detection sensitivity. We then introduce the current understanding of the interaction of nanomaterials with biological systems, mainly living cells, to guide the design of functionalized SERS nanoparticles for target detection. We further introduce the current status of label-free (direct) and labeled (indirect) SERS detections, for systems from biomolecules, to pathogens, to living cells, and we discuss the potential interferences from experimental design, measurement conditions, and data analysis. In the end, we give an outlook of the key challenges in bioanalytical SERS, including reproducibility, sensitivity, and spatial and time resolution.
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Affiliation(s)
- Cheng Zong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
| | - Mengxi Xu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
| | - Li-Jia Xu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
| | - Ting Wei
- State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
| | - Xin Ma
- State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
| | - Xiao-Shan Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
| | - Ren Hu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
| | - Bin Ren
- State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China
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Zhang Z, Bando K, Taguchi A, Mochizuki K, Sato K, Yasuda H, Fujita K, Kawata S. Au-Protected Ag Core/Satellite Nanoassemblies for Excellent Extra-/Intracellular Surface-Enhanced Raman Scattering Activity. ACS APPLIED MATERIALS & INTERFACES 2017; 9:44027-44037. [PMID: 29171749 DOI: 10.1021/acsami.7b14976] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Silver nanoparticles (AgNPs) and their assembled nanostructures such as core/satellite nanoassemblies are quite attractive in plasmonic-based applications. However, one biggest drawback of the AgNPs is the poor chemical stability which also greatly limits their applications. We report fine Au coating on synthesized quasi-spherical silver nanoparticles (AgNSs) with few atomic layers to several nanometers by stoichiometric method. The fine Au coating layer was confirmed by energy-dispersive X-ray spectroscopy elemental mapping and aberration-corrected high-angle annular dark-field scanning transmission electron microscopy. The optimized minimal thickness of Au coating layer on different sized AgNSs (22 nm Ag@0.9 nm Au, 44 nm Ag@1.8 nm Au, 75 nm Ag@2.9 nm Au, and 103 nm Ag@0.9 nm Au) was determined by extreme chemical stability tests using H2O2, NaSH, and H2S gas. The thin Au coating layer on AgNSs did not affect their plasmonic-based applications. The core/satellite assemblies based on Ag@Au NPs showed the comparable SERS intensity and uniformity three times higher than that of noncoated Ag core/satellites. The Ag@Au core/satellites also showed high stability in intracellular SERS imaging for at least two days, while the SERS of the noncoated Ag core/satellites decayed significantly. These spherical Ag@Au NPs can be widely used and have great advantages in plasmon-based applications, intracellular SERS probes, and other biological and analytical studies.
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Affiliation(s)
- Zhiqiang Zhang
- Department of Applied Physics, Osaka University , Suita, Osaka 565-0871, Japan
- CAS Key Lab of Bio-Medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences , 215163 Suzhou, China
| | - Kazuki Bando
- Department of Applied Physics, Osaka University , Suita, Osaka 565-0871, Japan
| | - Atsushi Taguchi
- Department of Applied Physics, Osaka University , Suita, Osaka 565-0871, Japan
| | - Kentaro Mochizuki
- Department of Applied Physics, Osaka University , Suita, Osaka 565-0871, Japan
| | - Kazuhisa Sato
- Research Center for Ultra-High Voltage Electron Microscopy, Osaka University , Ibaraki, Osaka 567-0047, Japan
| | - Hidehiro Yasuda
- Research Center for Ultra-High Voltage Electron Microscopy, Osaka University , Ibaraki, Osaka 567-0047, Japan
| | - Katsumasa Fujita
- Department of Applied Physics, Osaka University , Suita, Osaka 565-0871, Japan
| | - Satoshi Kawata
- Department of Applied Physics, Osaka University , Suita, Osaka 565-0871, Japan
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Xi W, Shrestha BK, Haes AJ. Promoting Intra- and Intermolecular Interactions in Surface-Enhanced Raman Scattering. Anal Chem 2017; 90:128-143. [DOI: 10.1021/acs.analchem.7b04225] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Wenjing Xi
- Department of Chemistry, University of Iowa, Iowa City, Iowa, 55242 United States
| | - Binaya K. Shrestha
- Department of Chemistry, University of Iowa, Iowa City, Iowa, 55242 United States
| | - Amanda J. Haes
- Department of Chemistry, University of Iowa, Iowa City, Iowa, 55242 United States
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Jamieson LE, Asiala SM, Gracie K, Faulds K, Graham D. Bioanalytical Measurements Enabled by Surface-Enhanced Raman Scattering (SERS) Probes. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2017; 10:415-437. [PMID: 28301754 DOI: 10.1146/annurev-anchem-071015-041557] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Since its discovery in 1974, surface-enhanced Raman scattering (SERS) has gained momentum as an important tool in analytical chemistry. SERS is used widely for analysis of biological samples, ranging from in vitro cell culture models, to ex vivo tissue and blood samples, and direct in vivo application. New insights have been gained into biochemistry, with an emphasis on biomolecule detection, from small molecules such as glucose and amino acids to larger biomolecules such as DNA, proteins, and lipids. These measurements have increased our understanding of biological systems, and significantly, they have improved diagnostic capabilities. SERS probes display unique advantages in their detection sensitivity and multiplexing capability. We highlight key considerations that are required when performing bioanalytical SERS measurements, including sample preparation, probe selection, instrumental configuration, and data analysis. Some of the key bioanalytical measurements enabled by SERS probes with application to in vitro, ex vivo, and in vivo biological environments are discussed.
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Affiliation(s)
- Lauren E Jamieson
- Centre for Molecular Nanometrology, WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, Glasgow, G1 1RD, United Kingdom;
| | - Steven M Asiala
- Centre for Molecular Nanometrology, WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, Glasgow, G1 1RD, United Kingdom;
| | - Kirsten Gracie
- Centre for Molecular Nanometrology, WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, Glasgow, G1 1RD, United Kingdom;
| | - Karen Faulds
- Centre for Molecular Nanometrology, WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, Glasgow, G1 1RD, United Kingdom;
| | - Duncan Graham
- Centre for Molecular Nanometrology, WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, Glasgow, G1 1RD, United Kingdom;
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Ember KJI, Hoeve MA, McAughtrie SL, Bergholt MS, Dwyer BJ, Stevens MM, Faulds K, Forbes SJ, Campbell CJ. Raman spectroscopy and regenerative medicine: a review. NPJ Regen Med 2017; 2:12. [PMID: 29302348 PMCID: PMC5665621 DOI: 10.1038/s41536-017-0014-3] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 02/27/2017] [Accepted: 03/06/2017] [Indexed: 01/22/2023] Open
Abstract
The field of regenerative medicine spans a wide area of the biomedical landscape-from single cell culture in laboratories to human whole-organ transplantation. To ensure that research is transferrable from bench to bedside, it is critical that we are able to assess regenerative processes in cells, tissues, organs and patients at a biochemical level. Regeneration relies on a large number of biological factors, which can be perturbed using conventional bioanalytical techniques. A versatile, non-invasive, non-destructive technique for biochemical analysis would be invaluable for the study of regeneration; and Raman spectroscopy is a potential solution. Raman spectroscopy is an analytical method by which chemical data are obtained through the inelastic scattering of light. Since its discovery in the 1920s, physicists and chemists have used Raman scattering to investigate the chemical composition of a vast range of both liquid and solid materials. However, only in the last two decades has this form of spectroscopy been employed in biomedical research. Particularly relevant to regenerative medicine are recent studies illustrating its ability to characterise and discriminate between healthy and disease states in cells, tissue biopsies and in patients. This review will briefly outline the principles behind Raman spectroscopy and its variants, describe key examples of its applications to biomedicine, and consider areas of regenerative medicine that would benefit from this non-invasive bioanalytical tool.
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Affiliation(s)
- Katherine J. I. Ember
- 0000 0004 1936 7988grid.4305.2School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ UK
- 0000 0004 1936 7988grid.4305.2MRC Centre for Regenerative Medicine, University of Edinburgh, 5 Little France Drive, Edinburgh, EH16 4UU UK
| | - Marieke A. Hoeve
- 0000 0004 1936 7988grid.4305.2MRC Centre for Regenerative Medicine, University of Edinburgh, 5 Little France Drive, Edinburgh, EH16 4UU UK
| | - Sarah L. McAughtrie
- 0000 0004 1936 7988grid.4305.2School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ UK
| | - Mads S. Bergholt
- 0000 0001 2113 8111grid.7445.2Department of Materials, Imperial College London, London, SW7 2AZ UK
- 0000 0001 2113 8111grid.7445.2Department of Bioengineering, Imperial College London, London, SW7 2AZ UK
- 0000 0001 2113 8111grid.7445.2Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ UK
| | - Benjamin J. Dwyer
- 0000 0004 1936 7988grid.4305.2MRC Centre for Regenerative Medicine, University of Edinburgh, 5 Little France Drive, Edinburgh, EH16 4UU UK
| | - Molly M. Stevens
- 0000 0001 2113 8111grid.7445.2Department of Materials, Imperial College London, London, SW7 2AZ UK
- 0000 0001 2113 8111grid.7445.2Department of Bioengineering, Imperial College London, London, SW7 2AZ UK
- 0000 0001 2113 8111grid.7445.2Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ UK
| | - Karen Faulds
- 0000000121138138grid.11984.35Department of Pure and Applied Chemistry, University of Strathclyde, Technology and Innovation Building, 99 George Street, Glasgow, G1 1RD UK
| | - Stuart J. Forbes
- 0000 0004 1936 7988grid.4305.2MRC Centre for Regenerative Medicine, University of Edinburgh, 5 Little France Drive, Edinburgh, EH16 4UU UK
| | - Colin J. Campbell
- 0000 0004 1936 7988grid.4305.2School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ UK
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Li N, Than A, Sun C, Tian J, Chen J, Pu K, Dong X, Chen P. Monitoring Dynamic Cellular Redox Homeostasis Using Fluorescence-Switchable Graphene Quantum Dots. ACS NANO 2016; 10:11475-11482. [PMID: 28024361 DOI: 10.1021/acsnano.6b07237] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Monitoring cellular redox homeostasis is critical to the understanding of many physiological functions ranging from immune reactions to metabolism, as well as to the understanding of pathological development ranging from tumorigenesis to aging. Nevertheless, there is currently a lack of appropriate probes for this ambition, which should be reversibly, sensitively, and promptly responsive to a wide range of physiological oxidants and reductants. In this work, a redox-sensitive fluorescence-switchable probe is designed based on graphene quantum dots (GQDs) functionalized with a chelated redox Fe2+/Fe3+ couple. The underlying mechanism is investigated and discussed. The high sensitivity and fast response are attributable to the fact that the GQD's photoluminescence is highly sensitive to photon-induced electron transfer because of its ultrasmall size and associated prominent quantum confinement effect. Also taking advantages of GQDs' excellent photostability, biocompatibility, and readiness for cell uptake, our reversibly tunable fluorescence probe is employed to monitor in real time the triggered dynamic change of the intracellular redox state. This addition to the limited arsenal of available redox probes shall be useful to the still poorly understood redox biology, as well as for monitoring environment or chemical processes involving redox reactions.
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Affiliation(s)
- Nan Li
- Division of Bioengineering, School of Chemical & Biomedical Engineering, Nanyang Technological University , 70 Nanyang Drive, Singapore 637457
| | - Aung Than
- Division of Bioengineering, School of Chemical & Biomedical Engineering, Nanyang Technological University , 70 Nanyang Drive, Singapore 637457
| | - Chencheng Sun
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Jingqi Tian
- Division of Bioengineering, School of Chemical & Biomedical Engineering, Nanyang Technological University , 70 Nanyang Drive, Singapore 637457
| | - Jie Chen
- Division of Bioengineering, School of Chemical & Biomedical Engineering, Nanyang Technological University , 70 Nanyang Drive, Singapore 637457
| | - Kanyi Pu
- Division of Bioengineering, School of Chemical & Biomedical Engineering, Nanyang Technological University , 70 Nanyang Drive, Singapore 637457
| | - Xiaochen Dong
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road, Nanjing 211816, China
| | - Peng Chen
- Division of Bioengineering, School of Chemical & Biomedical Engineering, Nanyang Technological University , 70 Nanyang Drive, Singapore 637457
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Tsivadze AY, Khubutiya MS, Goroncharovskaya IV, Andreev VN, Makarov MS, Khvatov VB, Borovkova NV, Evseev AK, Goldin MM. Electrochemical evaluation of the viability of platelets. DOKLADY PHYSICAL CHEMISTRY 2016. [DOI: 10.1134/s0012501616110026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Jamieson LE, Camus VL, Bagnaninchi PO, Fisher KM, Stewart GD, Nailon WH, McLaren DB, Harrison DJ, Campbell CJ. Targeted SERS nanosensors measure physicochemical gradients and free energy changes in live 3D tumor spheroids. NANOSCALE 2016; 8:16710-16718. [PMID: 27714168 DOI: 10.1039/c6nr06031e] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Use of multicellular tumor spheroids (MTS) to investigate therapies has gained impetus because they have potential to mimic factors including zonation, hypoxia and drug-resistance. However, analysis remains difficult and often destroys 3D integrity. Here we report an optical technique using targeted nanosensors that allows in situ 3D mapping of redox potential gradients whilst retaining MTS morphology and function. The magnitude of the redox potential gradient can be quantified as a free energy difference (ΔG) and used as a measurement of MTS viability. We found that by delivering different doses of radiotherapy to MTS we could correlate loss of ΔG with increasing therapeutic dose. In addition, we found that resistance to drug therapy was indicated by an increase in ΔG. This robust and reproducible technique allows interrogation of an in vitro tumor-model's bioenergetic response to therapy, indicating its potential as a tool for therapy development.
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Affiliation(s)
- Lauren E Jamieson
- EaStCHEM, School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK.
| | - Victoria L Camus
- EaStCHEM, School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK.
| | | | - Kate M Fisher
- EaStCHEM, School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK.
| | - Grant D Stewart
- Academic Urology Group, University of Cambridge, Addenbrooke's Hospital, Cambridge, CB2 0QQ, UK
| | - William H Nailon
- Edinburgh Radiation Research Collaborative, Department of Oncology Physics, Western General Hospital, Edinburgh EH4 2U, UK and School of Engineering, University of Edinburgh, Edinburgh, EH9 3JL, UK
| | - Duncan B McLaren
- Edinburgh Radiation Research Collaborative, Edinburgh Cancer Centre, Western General Hospital, Edinburgh EH4 2U, UK
| | | | - Colin J Campbell
- EaStCHEM, School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK.
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Wei H, Willner MR, Marr LC, Vikesland PJ. Highly stable SERS pH nanoprobes produced by co-solvent controlled AuNP aggregation. Analyst 2016; 141:5159-69. [PMID: 27143623 PMCID: PMC4987216 DOI: 10.1039/c6an00650g] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Production of gold nanoparticle (AuNP) surface-enhanced Raman spectroscopy (SERS) nanoprobes requires replicable aggregation to produce multimers with high signal intensity. Herein, we illustrate a novel, yet simple, approach to produce SERS nanoprobes through control of co-solvent composition. AuNP multimers were produced by mixing AuNP monomers in water : ethanol co-solvent for variable periods of time. By varying the water : ethanol ratio and the amount of 4-mercaptobenzoic acid (4-MBA) present, the aggregation rate can be systematically controlled. Thiolated poly(ethylene glycol) was then added to halt the aggregation process and provide steric stability. This approach was used to produce pH nanoprobes with excellent colloidal stability in high ionic strength environments and in complex samples. The pH probe exhibits broad pH sensitivity over the range 6-11 and we calculate that a single AuNP dimer in a 35 fL volume is sufficient to generate a detectable SERS signal. As a proof-of-concept, the probes were used to detect the intracellular pH of human prostate cancer cells (PC-3). The internalized probes exhibit a strong 4-MBA signal without any interfering bands from either the cells or the culture media and produce exceptionally detailed pH maps. pH maps obtained from 19 xy surface scans and 14 yz depth scans exhibit highly consistent intracellular pH in the range of 5 to 7, thus indicating the greater reliability and reproducibility of our pH probes compared with other probes previously reported in the literature. Our water : ethanol co-solvent production process is fast, simple, and efficient. Adjustment of solvent composition may become a powerful way to produce SERS tags or nanoprobes in the future.
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Affiliation(s)
- Haoran Wei
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA. and Institute for Critical Technology and Applied Science (ICTAS) Center for Sustainable Nanotechnology (VTSuN), Virginia Tech, Blacksburg, VA, USA and NSF-EPA Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, NC, USA
| | - Marjorie R Willner
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA. and Institute for Critical Technology and Applied Science (ICTAS) Center for Sustainable Nanotechnology (VTSuN), Virginia Tech, Blacksburg, VA, USA and NSF-EPA Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, NC, USA
| | - Linsey C Marr
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA. and Institute for Critical Technology and Applied Science (ICTAS) Center for Sustainable Nanotechnology (VTSuN), Virginia Tech, Blacksburg, VA, USA and NSF-EPA Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, NC, USA
| | - Peter J Vikesland
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA. and Institute for Critical Technology and Applied Science (ICTAS) Center for Sustainable Nanotechnology (VTSuN), Virginia Tech, Blacksburg, VA, USA and NSF-EPA Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, NC, USA
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47
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Simpson J, Craig D, Faulds K, Graham D. Mixed-monolayer glyconanoparticles for the detection of cholera toxin by surface enhanced Raman spectroscopy. NANOSCALE HORIZONS 2016; 1:60-63. [PMID: 32260603 DOI: 10.1039/c5nh00036j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We have produced silver glyconanoparticles for the sensitive (56 ng mL -1), low volume and rapid detection of cholera toxin B-subunit (CTB) in synthetic freshwater (simulating the ion compositions of natural waters in which CTB could be found). This is achieved by monitoring the changes in surface enhanced Raman scattering (SERS) intensity of a Raman reporter bound to the glyconanoparticle surface. The particles selectively aggregate upon interaction with CTB, causing an increase in the measured SERS signal. The particles are designed to mimic the interactions involving the cell surface GM1 ganglioside and CTB. This is achieved by using a combination of polyethylene glycol linkers terminated with either galactose or sialic acid.
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Affiliation(s)
- Jonathan Simpson
- Centre for Molecular Nanometrology, Department of Pure and Applied Chemistry, University of Strathclyde (Technology and Innovation Centre), 99 George Street, Glasgow, G1 1RD, UK.
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48
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Camus VL, Stewart G, Nailon WH, McLaren DB, Campbell CJ. Measuring the effects of fractionated radiation therapy in a 3D prostate cancer model system using SERS nanosensors. Analyst 2016; 141:5056-61. [DOI: 10.1039/c6an01032f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Using Surface Enhanced Raman Spectroscopy to measure cell death caused by radiation in a 3D model of prostate cancer.
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Affiliation(s)
| | - Grant Stewart
- School of Clinical Surgery
- University of Edinburgh EH16
- UK
| | - William H. Nailon
- Edinburgh Radiation Research Collaborative
- Oncology Physics
- Western General Hospital
- Edinburgh EH4 2U
- UK
| | - Duncan B. McLaren
- Edinburgh Radiation Research Collaborative
- Edinburgh Cancer Centre
- Western General Hospital
- Edinburgh EH4 2U
- UK
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49
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Jamieson LE, Harrison DJ, Campbell CJ. Chemical analysis of multicellular tumour spheroids. Analyst 2015; 140:3910-20. [PMID: 25923379 DOI: 10.1039/c5an00524h] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Conventional two dimensional (2D) monolayer cell culture has been considered the 'gold standard' technique for in vitro cellular experiments. However, the need for a model that better mimics the three dimensional (3D) architecture of tissue in vivo has led to the development of Multicellular Tumour Spheroids (MTS) as a 3D tissue culture model. To some extent MTS mimic the environment of in vivo tumours where, for example, oxygen and nutrient gradients develop, protein expression changes and cells form a spherical structure with regions of proliferation, senescence and necrosis. This review focuses on the development of techniques for chemical analysis of MTS as a tool for understanding in vivo tumours and a platform for more effective drug and therapy discovery. While traditional monolayer techniques can be translated to 3D models, these often fail to provide the desired spatial resolution and z-penetration for live cell imaging. More recently developed techniques for overcoming these problems will be discussed with particular reference to advances in instrument technology for achieving the increased spatial resolution and imaging depth required.
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Affiliation(s)
- L E Jamieson
- EaStCHEM, School of Chemistry, University of Edinburgh, Edinburgh, EH9 3JJ, UK.
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50
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Thomson PIT, Camus VL, Hu Y, Campbell CJ. Series of Quinone-Containing Nanosensors for Biologically Relevant Redox Potential Determination by Surface-Enhanced Raman Spectroscopy. Anal Chem 2015; 87:4719-25. [DOI: 10.1021/ac504795s] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Patrick I. T. Thomson
- School of Chemistry, University of Edinburgh, Joseph
Black Building, David Brewster Road, Edinburgh, United Kingdom EH9 3FJ
| | - Victoria L. Camus
- School of Chemistry, University of Edinburgh, Joseph
Black Building, David Brewster Road, Edinburgh, United Kingdom EH9 3FJ
| | - Yuyu Hu
- School of Chemistry, University of Edinburgh, Joseph
Black Building, David Brewster Road, Edinburgh, United Kingdom EH9 3FJ
| | - Colin J. Campbell
- School of Chemistry, University of Edinburgh, Joseph
Black Building, David Brewster Road, Edinburgh, United Kingdom EH9 3FJ
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