1
|
|
2
|
Yarysheva AY, Dolgova AA, Yarysheva LM, Arzhakova OV. Hydrophilization of polypropylene films by poly(ethylene oxide) via intercrystallite crazing. MENDELEEV COMMUNICATIONS 2020. [DOI: 10.1016/j.mencom.2020.07.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
3
|
Arzhakova OV, Dolgova AA, Kopnov AY, Nazarov AI, Yarysheva AY, Sazhnikov VA. Nanocomposite Polymeric Materials Based on Butyl Rhodamine B
Incorporated in Mesoporous Films of High-Density Polyethylene. RUSS J GEN CHEM+ 2020. [DOI: 10.1134/s1070363220040271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
4
|
Reversible Oxygen Sensing Based on Multi-Emission Fluorescence Quenching. SENSORS 2020; 20:s20020477. [PMID: 31952123 PMCID: PMC7014081 DOI: 10.3390/s20020477] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/09/2020] [Accepted: 01/10/2020] [Indexed: 12/22/2022]
Abstract
Oxygen is ubiquitous in nature and it plays a key role in several biological processes, such as cellular respiration and food deterioration, to name a few. Currently, reversible and non-destructive oxygen sensing is usually performed with sensors produced by photosensitization of phosphorescent organometallic complexes. In contrast, we propose a novel route of optical oxygen sensing by fluorescence-based quenching of oxygen. We hereby developed for the first time a set of multi-emissive purely organic emitters. These were produced through a one-pot hydrothermal synthesis using p-phenylenediamine (PPD) and urea as starting materials. The origin of the multi-emission has been ascribed to the diversity of chemical structures produced as a result of oxidative oligomerization of PPD. A Bandrowski's base (BB, i.e., trimer of PPD) is reported as the main component at reaction times higher than 8 h. This indication was confirmed by electrospray-ionization quadrupole time-of-flight (ESI-QTOF) and liquid chromatography-mass spectrometry (LC-MS) analysis. Once the emitters are embedded within a high molecular weight poly (vinyl alcohol) matrix, the intensities of all three emission centers exhibit a non-linear quenching provoked by oxygen within the range of 0-8 kPa. The detection limit of the emission centers are 0.89 kPa, 0.67 kPa and 0.75 kPa, respectively. This oxygen-dependent change in fluorescence emission is reversible (up to three tested 0-21% O2 cycles) and reproducible with negligible cross-interference to humidity. The cost-effectiveness, metal-free formulation, cross-referencing between each single emission center and the relevant oxygen range are all appealing features, making these sensors promising for the detection of oxygen, e.g., in food packaged products.
Collapse
|
5
|
Environmental crazing and properties of mesoporous and nanocomposite materials based on poly(tetrafluoroethylene) films. POLYMER 2019. [DOI: 10.1016/j.polymer.2018.12.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
6
|
Stability and Safety Assessment of Phosphorescent Oxygen Sensors for Use in Food Packaging Applications. CHEMOSENSORS 2018. [DOI: 10.3390/chemosensors6030038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Five types of new solid-state oxygen sensors, four based on microporous polypropylene fabric materials and one on polyphenylene sulphide films impregnated with phosphorescent platinum(II)-benzoporphyrin dye, were tested for their stability and safety in food packaging applications. All these sensors exhibit useful optical signals (phosphorescence lifetime readout) and working characteristics and are simpler and cheaper to produce and integrate into standard packaging materials than existing commercial sensors. When exposed to a panel of standard food simulants and upon direct contact with raw beef and chicken meat and cheddar cheese samples packaged under modified atmosphere, the sensors based on ungrafted polypropylene fabric, impregnated with PtBP dye by the swelling method, outperformed the other sensors. The sensors are also stable upon storage under normal atmospheric conditions for at least 12 months, without any significant changes in calibration.
Collapse
|
7
|
Kelly CA, Cruz-Romero M, Kerry JP, Papkovsky DP. Assessment of Performance of the Industrial Process of Bulk Vacuum Packaging of Raw Meat with Nondestructive Optical Oxygen Sensing Systems. SENSORS 2018; 18:s18051395. [PMID: 29724024 PMCID: PMC5981195 DOI: 10.3390/s18051395] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 04/25/2018] [Accepted: 04/29/2018] [Indexed: 11/30/2022]
Abstract
The commercially-available optical oxygen-sensing system Optech-O2 Platinum was applied to nondestructively assess the in situ performance of bulk, vacuum-packaged raw beef in three ~300 kg containers. Twenty sensors were attached to the inner surface of the standard bin-contained laminate bag (10 on the front and back sides), such that after filling with meat and sealing under vacuum, the sensors were accessible for optical interrogation with the external reader device. After filling and sealing each bag, the sensors were measured repetitively and nondestructively over a 15-day storage period at 1 °C, thus tracking residual oxygen distribution in the bag and changes during storage. The sensors revealed a number of unidentified meat quality and processing issues, and helped to improve the packaging process by pouring flakes of dry ice into the bag. Sensor utility in mapping the distribution of residual O2 in sealed bulk containers and optimising and improving the packaging process, including handling and storage of bulk vacuum-packaged meat bins, was evident.
Collapse
Affiliation(s)
- Caroline A Kelly
- School of Biochemistry and Cell Biology, University College Cork, Cavanagh Pharmacy Building, College Road, Cork T12 K8AF, Ireland.
| | - Malco Cruz-Romero
- Food Packaging Group, School of Food and Nutritional Sciences, University College Cork, Food Science Building, College Road, Cork T12 K8AF, Ireland.
| | - Joseph P Kerry
- Food Packaging Group, School of Food and Nutritional Sciences, University College Cork, Food Science Building, College Road, Cork T12 K8AF, Ireland.
| | - Dmitri P Papkovsky
- School of Biochemistry and Cell Biology, University College Cork, Cavanagh Pharmacy Building, College Road, Cork T12 K8AF, Ireland.
| |
Collapse
|
8
|
Simultaneous Phosphorescence and Fluorescence Lifetime Imaging by Multi-Dimensional TCSPC and Multi-Pulse Excitation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1035:19-30. [PMID: 29080128 DOI: 10.1007/978-3-319-67358-5_2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
TCSPC FLIM/PLIM is based on a multi-dimensional time-correlated single-photon counting process. The sample is scanned by a high-frequency-pulsed laser beam which is additionally modulated on/off synchronously with the pixels of the scan. FLIM is obtained by building up the distribution of the photons over the scanning coordinates and the times of the photons in the excitation pulse sequence, PLIM is obtained by building up the photon distribution over the scanning coordinates and the photon times in the modulation period. FLIM and PLIM data are thus obtained simultaneously within the same imaging process. Since the technique uses not only one but many excitation pulses for every phosphorescence signal period the sensitivity is much higher than for techniques that excite with a single pulse only. TCSPC FLIM/PLIM works both with one-photon and two-photon excitation, does not require a reduction of the laser pulse repetition rate by a pulse picker, and eliminates the need of high pulse energy for phosphorescence excitation.
Collapse
|
9
|
Wu Y, Zeng G, Lvyue N, Wu W, Jiang T, Wu R, Guo W, Li X, Fan X. Triethylene glycol-modified iridium(iii) complexes for fluorescence imaging of Schistosoma japonicum. J Mater Chem B 2017; 5:4973-4980. [PMID: 32264013 DOI: 10.1039/c7tb00662d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Schistosomiasis, an infectious disease caused by the Schistosoma parasitic worm, presents a serious public health issue. To date, investigation of anti-Schistosomiasis drug mechanisms through fluorescence imaging remains challenging due to the lack of appropriate dyes as fluorescent probes. Phosphorescent Ir(iii) complexes have been attracting substantial attention among various classes of fluorophores given their excellent photophysical properties. Herein, four phosphorescent Ir(iii) complexes were synthesized, two of which contained a triethylene glycol (TEG) hydrophilic group. The phosphorescent emission range of the four complexes lay between 500 and 750 nm, and their quantum yields ranged from 0.031 to 0.146. Furthermore, under the experimental concentration conditions, the TEG-modified complexes had low cytotoxicity. Cell fluorescence labeling experiments indicated that the TEG-modified complexes had good membrane permeability. Finally, the TEG-modified complexes showed remarkable labeling effects in adult Schistosoma fluorescence imaging. Thus, TEG-modified Ir(iii) complexes could be used as a new class of bilharzial fluorescent probes.
Collapse
Affiliation(s)
- Yongquan Wu
- School of Chemistry and Chemical Engineering & Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou, Jiangxi 341000, P. R. China.
| | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Okkelman IA, Dolgova AA, Banerjee S, Kerry JP, Volynskii A, Arzhakova OV, Papkovsky DB. Phosphorescent Oxygen and Mechanosensitive Nanostructured Materials Based on Hard Elastic Polypropylene Films. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13587-13592. [PMID: 28367617 DOI: 10.1021/acsami.7b00405] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
It is well known that sensitivity of quenched-phosphorescence O2 sensors can be tuned by changing the nature of indicator dye and host polymer acting as encapsulation and quenching mediums. Here, we describe a new type of sensor materials based on nanostructured hard elastic polymeric substrates. With the example of hard elastic polypropylene films impregnated with Pt-benzoporphyrin dye, we show that such substrates enable simple one-step fabrication of O2 sensors by standard and scalable polymer processing technologies. In addition, the resulting sensor materials show prominent response to tensile drawing via changes in phosphorescence intensity and lifetime and O2 quenching constant, Kq. The mechanosensitive response shows reversibility and hysteresis, which are related to macroscopic changes in the nanoporous structure of the polymer. Such multifunctional materials can find use as mechanically tunable O2 sensors, as well as strain/deformation sensors operating in a phosphorescence-lifetime-based detection mode.
Collapse
Affiliation(s)
- Irina A Okkelman
- School of Biochemistry and Cell Biology, University College Cork , Western Road, Cork T12 YN60, Ireland
| | - Alla A Dolgova
- Faculty of Chemistry, Lomonosov Moscow State University , Leninskiye Gory, Moscow 119991, Russia
| | - Swagata Banerjee
- School of Biochemistry and Cell Biology, University College Cork , Western Road, Cork T12 YN60, Ireland
| | - Joseph P Kerry
- School of Biochemistry and Cell Biology, University College Cork , Western Road, Cork T12 YN60, Ireland
| | - Aleksandr Volynskii
- Faculty of Chemistry, Lomonosov Moscow State University , Leninskiye Gory, Moscow 119991, Russia
| | - Olga V Arzhakova
- Faculty of Chemistry, Lomonosov Moscow State University , Leninskiye Gory, Moscow 119991, Russia
| | - Dmitri B Papkovsky
- School of Biochemistry and Cell Biology, University College Cork , Western Road, Cork T12 YN60, Ireland
| |
Collapse
|
11
|
Yarysheva AY, Bagrov DV, Bakirov VAV, Tarasevich BN, Grohovskaya TE, Yarysheva LM, Chvalun SN, Volynskii AL. Polyethylene–Poly(ethylene oxide) Hybrid Films Obtained by Crazing and Their Structural Peculiarities. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02512] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Alena Y. Yarysheva
- Faculty
of Chemistry, Lomonosov Moscow State University, Leninskie gory 1-3, Moscow 119991, Russia
| | - Dmitry V. Bagrov
- Faculty
of Biology, Lomonosov Moscow State University, Leninskie gory 1-12, Moscow 119991, Russia
| | - V. Artem V. Bakirov
- National Research Center Kurchatov Institute, Akademika Kurchatova, pl. 1, 123182, Moscow, Russia
- Institute of Synthetic Polymer Materials RAS, Profsoyuznaya st. 70, 117393, Moscow, Russia
| | - Boris N. Tarasevich
- Faculty
of Chemistry, Lomonosov Moscow State University, Leninskie gory 1-3, Moscow 119991, Russia
| | - Tatiana E. Grohovskaya
- Faculty
of Chemistry, Lomonosov Moscow State University, Leninskie gory 1-3, Moscow 119991, Russia
| | - Larisa M. Yarysheva
- Faculty
of Chemistry, Lomonosov Moscow State University, Leninskie gory 1-3, Moscow 119991, Russia
| | - Sergey N. Chvalun
- National Research Center Kurchatov Institute, Akademika Kurchatova, pl. 1, 123182, Moscow, Russia
- Institute of Synthetic Polymer Materials RAS, Profsoyuznaya st. 70, 117393, Moscow, Russia
| | - Aleksandr L. Volynskii
- Faculty
of Chemistry, Lomonosov Moscow State University, Leninskie gory 1-3, Moscow 119991, Russia
| |
Collapse
|
12
|
Kalinina S, Breymayer J, Schäfer P, Calzia E, Shcheslavskiy V, Becker W, Rück A. Correlative NAD(P)H-FLIM and oxygen sensing-PLIM for metabolic mapping. JOURNAL OF BIOPHOTONICS 2016; 9:800-811. [PMID: 26990032 DOI: 10.1002/jbio.201500297] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 02/02/2016] [Accepted: 02/21/2016] [Indexed: 06/05/2023]
Abstract
Cellular responses to oxygen tension have been studied extensively. Oxygen tension can be determined by considering the phosphorescence lifetime of a phosphorescence sensor. The simultaneous usage of FLIM of coenzymes as NAD(P)H and FAD(+) and PLIM of oxygen sensors could provide information about correlation of metabolic pathways and oxygen tension. We investigated correlative NAD(P)H-FLIM and oxygen sensing-PLIM for simultaneously analyzing cell metabolism and oxygen tension. Cell metabolism and pO2 were observed under different hypoxic conditions in squamous carcinoma cell cultures and in complex ex vivo systems. Increased hypoxia induced an increase of the phosphorescence lifetime of Ru(BPY)3 and in most cases a decrease in the lifetime of NAD(P)H which is in agreement to the expected decrease of the protein-bound NAD(P)H during hypoxia. Oxygen was modulated directly in the mitochondrial membrane. Blocking of complex III and accumulation of oxygen could be observed by both the decrease of the phosphorescence lifetime of Ru(BPY)3 and a reduction of the lifetime of NAD(P)H which was a clear indication of acute changes in the redox state of the cells. For the first time simultaneous FLIM/PLIM has been shown to be able to visualize intracellular oxygen tension together with a change from oxidative to glycolytic phenotype.
Collapse
Affiliation(s)
- Sviatlana Kalinina
- Ulm University, Core Facility Confocal and Multiphoton Microscopy, N24, Albert Einstein Allee 11, 89081, Ulm, Germany.
| | - Jasmin Breymayer
- Ulm University, Core Facility Confocal and Multiphoton Microscopy, N24, Albert Einstein Allee 11, 89081, Ulm, Germany
| | - Patrick Schäfer
- Zentrum biomedizinische Forschung (ZBF), Ulm University, Institute of Neurology, Helmholtzstr. 8/1, 89081, Ulm, Germany
| | - Enrico Calzia
- Institut für Anästhesiologische Pathophysiologie und Verfahrensentwicklung, Universitätsklinikum Ulm, Helmholtzstr. 8/1, 89081, Ulm, Germany
| | | | - Wolfgang Becker
- Becker & Hickl GmbH, Nahmitzer Damm 30, 12277, Berlin, Germany
| | - Angelika Rück
- Ulm University, Core Facility Confocal and Multiphoton Microscopy, N24, Albert Einstein Allee 11, 89081, Ulm, Germany.
| |
Collapse
|
13
|
Ma Y, Liang H, Zeng Y, Yang H, Ho CL, Xu W, Zhao Q, Huang W, Wong WY. Phosphorescent soft salt for ratiometric and lifetime imaging of intracellular pH variations. Chem Sci 2016; 7:3338-3346. [PMID: 29997827 PMCID: PMC6006953 DOI: 10.1039/c5sc04624f] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 02/04/2016] [Indexed: 12/30/2022] Open
Abstract
In contrast to traditional short-lived fluorescent probes, long-lived phosphorescent probes based on transition-metal complexes can effectively eliminate unwanted background interference by using time-resolved luminescence imaging techniques, such as photoluminescence lifetime imaging microscopy. Hence, phosphorescent probes have become one of the most attractive candidates for investigating biological events in living systems. However, most of them are based on single emission intensity changes, which might be affected by a variety of intracellular environmental factors. Ratiometric measurement allows simultaneous recording of two separated wavelengths instead of measuring mere intensity changes and thus offers built-in correction for environmental effects. Herein, for the first time, a soft salt based phosphorescent probe has been developed for ratiometric and lifetime imaging of intracellular pH variations in real time. Specifically, a pH sensitive cationic complex (C1) and a pH insensitive anionic complex (A1) are directly connected through electrostatic interaction to form a soft salt based probe (S1), which exhibits a ratiometric phosphorescent response to pH with two well-resolved emission peaks separated by about 150 nm (from 475 to 625 nm). This novel probe was then successfully applied for ratiometric and lifetime imaging of intracellular pH variations. Moreover, quantitative measurements of intracellular pH fluctuations caused by oxidative stress have been performed for S1 based on the pH-dependent calibration curve.
Collapse
Affiliation(s)
- Yun Ma
- Institute of Molecular Functional Materials , Department of Chemistry and Partner State Key Laboratory of Environmental and Biological Analysis , Hong Kong Baptist University , Waterloo Road , Hong Kong , P. R. China . ; ; Tel: +852 34117074
| | - Hua Liang
- Key Laboratory for Organic Electronics & Information Displays (KLOEID) , Institute of Advanced Materials (IAM) , Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing University of Posts and Telecommunications , Nanjing 210023 , P. R. China . ; ; Tel: +86 25 85866396
| | - Yi Zeng
- Institute of Molecular Functional Materials , Department of Chemistry and Partner State Key Laboratory of Environmental and Biological Analysis , Hong Kong Baptist University , Waterloo Road , Hong Kong , P. R. China . ; ; Tel: +852 34117074
| | - Huiran Yang
- Key Laboratory for Organic Electronics & Information Displays (KLOEID) , Institute of Advanced Materials (IAM) , Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing University of Posts and Telecommunications , Nanjing 210023 , P. R. China . ; ; Tel: +86 25 85866396
| | - Cheuk-Lam Ho
- Institute of Molecular Functional Materials , Department of Chemistry and Partner State Key Laboratory of Environmental and Biological Analysis , Hong Kong Baptist University , Waterloo Road , Hong Kong , P. R. China . ; ; Tel: +852 34117074
| | - Wenjuan Xu
- Key Laboratory for Organic Electronics & Information Displays (KLOEID) , Institute of Advanced Materials (IAM) , Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing University of Posts and Telecommunications , Nanjing 210023 , P. R. China . ; ; Tel: +86 25 85866396
| | - Qiang Zhao
- Key Laboratory for Organic Electronics & Information Displays (KLOEID) , Institute of Advanced Materials (IAM) , Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing University of Posts and Telecommunications , Nanjing 210023 , P. R. China . ; ; Tel: +86 25 85866396
| | - Wei Huang
- Key Laboratory for Organic Electronics & Information Displays (KLOEID) , Institute of Advanced Materials (IAM) , Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing University of Posts and Telecommunications , Nanjing 210023 , P. R. China . ; ; Tel: +86 25 85866396
| | - Wai-Yeung Wong
- Institute of Molecular Functional Materials , Department of Chemistry and Partner State Key Laboratory of Environmental and Biological Analysis , Hong Kong Baptist University , Waterloo Road , Hong Kong , P. R. China . ; ; Tel: +852 34117074
- Institute of Polymer Optoelectronic Materials and Devices , State Key Laboratory of Luminescent Materials and Devices , South China University of Technology , Guangzhou 510640 , P. R. China
| |
Collapse
|
14
|
Banerjee S, Kelly C, Kerry JP, Papkovsky DB. High throughput non-destructive assessment of quality and safety of packaged food products using phosphorescent oxygen sensors. Trends Food Sci Technol 2016. [DOI: 10.1016/j.tifs.2016.01.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
15
|
Staudinger C, Borisov SM. Long-wavelength analyte-sensitive luminescent probes and optical (bio)sensors. Methods Appl Fluoresc 2015; 3:042005. [PMID: 27134748 PMCID: PMC4849553 DOI: 10.1088/2050-6120/3/4/042005] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Long-wavelength luminescent probes and sensors become increasingly popular. They offer the advantage of lower levels of autofluorescence in most biological probes. Due to high penetration depth and low scattering of red and NIR light such probes potentially enable in vivo measurements in tissues and some of them have already reached a high level of reliability required for such applications. This review focuses on the recent progress in development and application of long-wavelength analyte-sensitive probes which can operate both reversibly and irreversibly. Photophysical properties, sensing mechanisms, advantages and limitations of individual probes are discussed.
Collapse
Affiliation(s)
- Christoph Staudinger
- Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria
| | - Sergey M Borisov
- Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria
| |
Collapse
|
16
|
|
17
|
Jenkins J, Dmitriev RI, Morten K, McDermott KW, Papkovsky DB. Oxygen-sensing scaffolds for 3-dimensional cell and tissue culture. Acta Biomater 2015; 16:126-35. [PMID: 25653216 DOI: 10.1016/j.actbio.2015.01.032] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 01/21/2015] [Accepted: 01/22/2015] [Indexed: 10/24/2022]
Abstract
Porous membrane scaffolds are widely used materials for three-dimensional cell cultures and tissue models. Additional functional modification of such scaffolds can significantly extend their use and operational performance. Here we describe hybrid microporous polystyrene-based scaffolds impregnated with a phosphorescent O2-sensitive dye PtTFPP, optimized for live cell fluorescence microscopy and imaging of O2 distribution in cultured cells. Modified scaffolds possess high brightness, convenient spectral characteristics (534 nm excitation, 650 nm emission), stable and robust response to pO2 in phosphorescence intensity and lifetime imaging modes (>twofold response over 21/0% O2), such as confocal PLIM. They are suitable for prolonged use under standard culturing conditions without affecting cell viability, and for multi-parametric imaging analysis of cultured cells and tissue samples. We tested the O2 scaffolds with cultured cancer cells (HCT116), multicellular aggregates (PC12) and rat brain slices and showed that they can inform on tissue oxygenation at different depths and cell densities, changes in respiration activity, viability and responses to drug treatment. Using this method multiplexed with staining of dead cells (CellTox Green) and active mitochondria (TMRM), we demonstrated that decreased O2 (20-24 μM) in scaffold corresponds to highest expression of tyrosine hydroxylase in PC12 cells. Such hypoxia is also beneficial for action of hypoxia-specific anti-cancer drug tirapazamine (TPZ). Thus, O2 scaffolds allow for better control of conditions in 3D tissue cultures, and are useful for a broad range of biomaterials and physiological studies.
Collapse
|