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Prater CB, Kjoller KJ, Stuart APD, Grigg DA, 'Limurn R, Gough KM. Widefield Super-Resolution Infrared Spectroscopy and Imaging of Autofluorescent Biological Materials and Photosynthetic Microorganisms Using Fluorescence Detected Photothermal Infrared (FL-PTIR). APPLIED SPECTROSCOPY 2024:37028241256978. [PMID: 38803165 DOI: 10.1177/00037028241256978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
We have demonstrated high-speed, super-resolution infrared (IR) spectroscopy and chemical imaging of autofluorescent biomaterials and organisms using camera-based widefield photothermal detection that takes advantage of temperature-dependent modulations of autofluorescent emission. A variety of biological materials and photosynthetic organisms exhibit strong autofluorescence emission under ultraviolet excitation and the autofluorescent emission has a very strong temperature dependence, of order 1%/K. Illuminating a sample with pulses of IR light from a wavelength-tunable laser source causes periodic localized sample temperature increases that result in a corresponding transient decrease in autofluorescent emission. A low-cost light-emitting diode-based fluorescence excitation source was used in combination with a conventional fluorescence microscopy camera to detect localized variations in autofluorescent emission over a wide area as an indicator of localized IR absorption. IR absorption image stacks were acquired over a range of IR wavelengths, including the fingerprint spectral range, enabling extraction of localized IR absorption spectra. We have applied widefield fluorescence detected photothermal IR (FL-PTIR) to an analysis of autofluorescent biological materials including collagen, leaf tissue, and photosynthetic organisms including diatoms and green microalgae cells. We have also demonstrated the FL-PTIR on live microalgae in water, demonstrating the potential for label-free dynamic chemical imaging of autofluorescent cells.
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Affiliation(s)
- Craig B Prater
- Photothermal Spectroscopy Corporation, Santa Barbara, California, USA
| | - Kevin J Kjoller
- Photothermal Spectroscopy Corporation, Santa Barbara, California, USA
| | - Andrew P D Stuart
- Photothermal Spectroscopy Corporation, Santa Barbara, California, USA
| | - David A Grigg
- Photothermal Spectroscopy Corporation, Santa Barbara, California, USA
| | - Rinuk 'Limurn
- Department of Chemistry, University of Manitoba, Winnipeg, Canada
| | - Kathleen M Gough
- Department of Chemistry, University of Manitoba, Winnipeg, Canada
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2
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Villa AM, Doglia SM, De Gioia L, Natalello A, Bertini L. Fluorescence of KCl Aqueous Solution: A Possible Spectroscopic Signature of Nucleation. J Phys Chem B 2022; 126:2564-2572. [PMID: 35344657 PMCID: PMC8996234 DOI: 10.1021/acs.jpcb.2c01496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
![]()
Ion pairing
in water solutions alters both the water hydrogen-bond network and
ion solvation, modifying the dynamics and properties of electrolyte
water solutions. Here, we report an anomalous intrinsic fluorescence
of KCl aqueous solution at room temperature and show that its intensity
increases with the salt concentration. From the ab initio density
functional theory (DFT) and time-dependent DFT modeling, we propose
that the fluorescence emission could originate from the stiffening
of the hydrogen bond network in the hydration shell of solvated ion-pairs
that suppresses the fast nonradiative decay and allows the slower
radiative channel to become a possible decay pathway. Because computations
suggest that the fluorophores are the local ion-water structures present
in the prenucleation phase, this band could be the signature of the
incoming salt precipitation.
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Affiliation(s)
- Anna Maria Villa
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy
| | - Silvia Maria Doglia
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy
| | - Luca De Gioia
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy
| | - Antonino Natalello
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy
| | - Luca Bertini
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy
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3
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Davey CJ, Vasiljevski ER, O’Donohue AK, Fleming SC, Schindeler A. Analysis of muscle tissue in vivo using fiber-optic autofluorescence and diffuse reflectance spectroscopy. JOURNAL OF BIOMEDICAL OPTICS 2021; 26:JBO-210110RR. [PMID: 34935315 PMCID: PMC8692235 DOI: 10.1117/1.jbo.26.12.125001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 11/16/2021] [Indexed: 06/14/2023]
Abstract
SIGNIFICANCE Current methods for analyzing pathological muscle tissue are time consuming and rarely quantitative, and they involve invasive biopsies. Faster and less invasive diagnosis of muscle disease may be achievable using marker-free in vivo optical sensing methods. AIM It was speculated that changes in the biochemical composition and structure of muscle associated with pathology could be measured quantitatively using visible wavelength optical spectroscopy techniques enabling automated classification. APPROACH A fiber-optic autofluorescence (AF) and diffuse reflectance (DR) spectroscopy device was manufactured. The device and data processing techniques based on principal component analysis were validated using in situ measurements on healthy skeletal and cardiac muscle. These methods were then applied to two mouse models of genetic muscle disease: a type 1 neurofibromatosis (NF1) limb-mesenchyme knockout (Nf1Prx1 - / - ) and a muscular dystrophy mouse (mdx). RESULTS Healthy skeletal and cardiac muscle specimens were separable using AF and DR with receiver operator curve areas (ROC-AUC) of >0.79. AF and DR analyses showed optically separable changes in Nf1Prx1 - / - quadriceps muscle (ROC-AUC >0.97) with no differences detected in the heart (ROC-AUC <0.67), which does not undergo gene deletion in this model. Changes in AF spectra in mdx muscle were seen between the 3 week and 10 week time points (ROC-AUC = 0.96) and were not seen in the wild-type controls (ROC-AUC = 0.58). CONCLUSION These findings support the utility of in vivo fiber-optic AF and DR spectroscopy for the assessment of muscle tissue. This report highlights that there is considerable scope to develop this marker-free optical technology for preclinical muscle research and for diagnostic assessment of clinical myopathies and dystrophies.
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Affiliation(s)
- Christopher J. Davey
- University of Sydney, Institute of Photonics and Optical Science, School of Physics, Sydney, New South Wales, Australia
| | - Emily R. Vasiljevski
- The Children’s Hospital at Westmead, Bioengineering and Molecular Medicine Laboratory, Westmead, New South Wales, Australia
- University of Sydney, Sydney Medical School, Discipline of Child and Adolescent Health, Sydney, New South Wales, Australia
| | - Alexandra K. O’Donohue
- The Children’s Hospital at Westmead, Bioengineering and Molecular Medicine Laboratory, Westmead, New South Wales, Australia
- University of Sydney, Sydney Medical School, Discipline of Child and Adolescent Health, Sydney, New South Wales, Australia
| | - Simon C. Fleming
- University of Sydney, Institute of Photonics and Optical Science, School of Physics, Sydney, New South Wales, Australia
| | - Aaron Schindeler
- The Children’s Hospital at Westmead, Bioengineering and Molecular Medicine Laboratory, Westmead, New South Wales, Australia
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Chakkarapani SK, Shin TH, Lee S, Park KS, Lee G, Kang SH. Quantifying intracellular trafficking of silica-coated magnetic nanoparticles in live single cells by site-specific direct stochastic optical reconstruction microscopy. J Nanobiotechnology 2021; 19:398. [PMID: 34844629 PMCID: PMC8628397 DOI: 10.1186/s12951-021-01147-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 11/16/2021] [Indexed: 11/17/2022] Open
Abstract
Background Nanoparticles have been used for biomedical applications, including drug delivery, diagnosis, and imaging based on their unique properties derived from small size and large surface-to-volume ratio. However, concerns regarding unexpected toxicity due to the localization of nanoparticles in the cells are growing. Herein, we quantified the number of cell-internalized nanoparticles and monitored their cellular localization, which are critical factors for biomedical applications of nanoparticles. Methods This study investigates the intracellular trafficking of silica-coated magnetic nanoparticles containing rhodamine B isothiocyanate dye [MNPs@SiO2(RITC)] in various live single cells, such as HEK293, NIH3T3, and RAW 264.7 cells, using site-specific direct stochastic optical reconstruction microscopy (dSTORM). The time-dependent subdiffraction-limit spatial resolution of the dSTORM method allowed intracellular site-specific quantification and tracking of MNPs@SiO2(RITC). Results The MNPs@SiO2(RITC) were observed to be highly internalized in RAW 264.7 cells, compared to the HEK293 and NIH3T3 cells undergoing single-particle analysis. In addition, MNPs@SiO2(RITC) were internalized within the nuclei of RAW 264.7 and HEK293 cells but were not detected in the nuclei of NIH3T3 cells. Moreover, because of the treatment of the MNPs@SiO2(RITC), more micronuclei were detected in RAW 264.7 cells than in other cells. Conclusion The sensitive and quantitative evaluations of MNPs@SiO2(RITC) at specific sites in three different cells using a combination of dSTORM, transcriptomics, and molecular biology were performed. These findings highlight the quantitative differences in the uptake efficiency of MNPs@SiO2(RITC) and ultra-sensitivity, varying according to the cell types as ascertained by subdiffraction-limit super-resolution microscopy. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s12951-021-01147-1.
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Affiliation(s)
- Suresh Kumar Chakkarapani
- Department of Chemistry, Graduate School, Kyung Hee University, Yongin-si, Gyeonggi-do, 17104, Republic of Korea
| | - Tae Hwan Shin
- Department of Physiology, Ajou University School of Medicine, 164, World cup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16499, Republic of Korea
| | - Seungah Lee
- Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Yongin-si, Gyeonggi-do, 17104, Republic of Korea
| | - Kyung-Soo Park
- Nanophotonics Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Gwang Lee
- Department of Physiology, Ajou University School of Medicine, 164, World cup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16499, Republic of Korea. .,Department of Molecular Science and Technology, Ajou University, Suwon-si, Gyeonggi-do, 16499, Republic of Korea.
| | - Seong Ho Kang
- Department of Chemistry, Graduate School, Kyung Hee University, Yongin-si, Gyeonggi-do, 17104, Republic of Korea. .,Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Yongin-si, Gyeonggi-do, 17104, Republic of Korea.
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Muir R, Forbes S, Birch DJS, Vyshemirsky V, Rolinski OJ. Collagen Glycation Detected by Its Intrinsic Fluorescence. J Phys Chem B 2021; 125:11058-11066. [PMID: 34555903 PMCID: PMC8793138 DOI: 10.1021/acs.jpcb.1c05001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Collagen’s long half-life
(in skin approximately 10 years)
makes this protein highly susceptible to glycation and formation of
the advanced glycation end products (AGEs). Accumulation of cross-linking
AGEs in the skin collagen has several detrimental effects; thus, the
opportunity for non-invasive monitoring of skin glycation is essential,
especially for diabetic patients. In this paper, we report using the
time-resolved intrinsic fluorescence of collagen as a biomarker of
its glycation. Contrary to the traditional fluorescence intensity
decay measurement at the arbitrarily selected excitation and detection
wavelengths, we conducted systematic wavelength- and time-resolved
measurements to achieve time-resolved emission spectra. Changes in
the intrinsic fluorescence kinetics, caused by both collagen aggregation
and glycation, have been detected.
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Affiliation(s)
- Rhona Muir
- Photophysics Group, Department of Physics, University of Strathclyde, Scottish Universities Physics Alliance, Glasgow G4 0NG, U.K
| | - Shareen Forbes
- BHF Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, U.K
| | - David J S Birch
- Photophysics Group, Department of Physics, University of Strathclyde, Scottish Universities Physics Alliance, Glasgow G4 0NG, U.K
| | | | - Olaf J Rolinski
- Photophysics Group, Department of Physics, University of Strathclyde, Scottish Universities Physics Alliance, Glasgow G4 0NG, U.K
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Gurchiek JK, Rose JB, Guberman-Pfeffer MJ, Tilluck RW, Ghosh S, Gascón JA, Beck WF. Fluorescence Anisotropy Detection of Barrier Crossing and Ultrafast Conformational Dynamics in the S 2 State of β-Carotene. J Phys Chem B 2020; 124:9029-9046. [PMID: 32955881 DOI: 10.1021/acs.jpcb.0c06961] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Carotenoids are usually only weakly fluorescent despite being very strong absorbers in the mid-visible region because their first two excited singlet states, S1 and S2, have very short lifetimes. To probe the structural mechanisms that promote the nonradiative decay of the S2 state to the S1 state, we have carried out a series of fluorescence lineshape and anisotropy measurements with a prototype carotenoid, β-carotene, in four aprotic solvents. The anisotropy values observed in the fluorescence emission bands originating from the S2 and S1 states reveal that the large internal rotations of the emission transition dipole moment, as much as 50° relative to that of the absorption transition dipole moment, are initiated during ultrafast evolution on the S2 state potential energy surface and persist upon nonradiative decay to the S1 state. Electronic structure calculations of the orientation of the transition dipole moment account for the anisotropy results in terms of torsional and pyramidal distortions near the center of the isoprenoid backbone. The excitation wavelength dependence of the fluorescence anisotropy indicates that these out-of-plane conformational motions are initiated by passage over a low-activation energy barrier from the Franck-Condon S2 structure. This conclusion is consistent with detection over the 80-200 K range of a broad, red-shifted fluorescence band from a dynamic intermediate evolving on a steep gradient of the S2 state potential energy surface after crossing the activation barrier. The temperature dependence of the oscillator strength and anisotropy indicate that nonadiabatic passage from S2 through a conical intersection seam to S1 is promoted by the out-of-plane motions of the isoprenoid backbone with strong hindrance by solvent friction.
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Affiliation(s)
- J K Gurchiek
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, Michigan 48824, United States
| | - Justin B Rose
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, Michigan 48824, United States
| | - Matthew J Guberman-Pfeffer
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, Connecticut 06268-1712, United States
| | - Ryan W Tilluck
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, Michigan 48824, United States
| | - Soumen Ghosh
- Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci, 32, Milan, Lombardy 20133, Italy
| | - José A Gascón
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, Connecticut 06268-1712, United States
| | - Warren F Beck
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, Michigan 48824, United States
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Grønlien KG, Pedersen ME, Tønnesen HH. A natural deep eutectic solvent (NADES) as potential excipient in collagen-based products. Int J Biol Macromol 2020; 156:394-402. [PMID: 32289414 DOI: 10.1016/j.ijbiomac.2020.04.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 03/26/2020] [Accepted: 04/05/2020] [Indexed: 12/12/2022]
Abstract
Natural deep eutectic solvents (NADES) have previously shown antibacterial properties alone or in combination with photosensitizers and light. In this study, we investigated the behavior of the structural protein collagen in a NADES solution. A combination of collagen and NADES adds the unique wound healing properties of collagen to the potential antibacterial effect of the NADES. The behavior of collagen in a NADES composed of citric acid and xylitol and aqueous dilutions thereof was assessed by spectroscopic, calorimetric and viscosity methods. Collagen exhibited variable unfolding properties dependent on the type of material (telo- or atelocollagen) and degree of aqueous dilution of the NADES. The results indicated that both collagen types were susceptible to unfolding in undiluted NADES. Collagen dissolved in highly diluted NADES showed similar results to collagen dissolved in acetic acid (i.e., NADES network possibly maintained). Based on the ability to dissolve collagen while maintaining its structural properties, NADES is regarded as a potential excipient in collagen-based products. This is the first study describing the solubility and structural changes of an extracellular matrix protein in NADES.
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Affiliation(s)
- Krister Gjestvang Grønlien
- Section for Pharmaceutics and Social Pharmacy, Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, NO-0316 Oslo, Norway.
| | | | - Hanne Hjorth Tønnesen
- Section for Pharmaceutics and Social Pharmacy, Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, NO-0316 Oslo, Norway
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McKay G. Emerging investigator series: critical review of photophysical models for the optical and photochemical properties of dissolved organic matter. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2020; 22:1139-1165. [PMID: 32270849 DOI: 10.1039/d0em00056f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Optical measurements (absorbance and fluorescence) are widely used to track dissolved organic matter (DOM) quantity and quality in natural and engineered systems. Despite many decades of research on the optical properties of DOM, there is a lack of understanding with regards to the underlying photophysical model that is the basis for these optical properties. This review both summarizes advances to date on the photophysical properties of DOM and seeks to critically evaluate the photophysical models for DOM optical properties. Recent studies have refined the quantitative understanding of DOM photophysical properties such as excited state lifetimes and energies, rates of different photophysical processes, and quantum yields. Considering fundamental models, more clarity is needed on whether DOM photophysical processes are due to a superposition of non-interacting components (superposition model), or whether a portion of optical signals can be ascribed to electronically interacting moieties, for example in the form of electron donor-acceptor complexes (charge transfer model). Multiple studies over more than two decades have provided evidence for the charge transfer model. Questions have been raised, however, about the broad applicability of the charge transfer model. The charge transfer and superposition model are critically reviewed in light of this current research. Recommendations are given for future studies to help clarify the accuracy of these competing photophysical models.
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Affiliation(s)
- Garrett McKay
- Zachry Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX 77843, USA.
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Czaplińska B, Malarz K, Mrozek-Wilczkiewicz A, Slodek A, Korzec M, Musiol R. Theoretical and Experimental Investigations of Large Stokes Shift Fluorophores Based on a Quinoline Scaffold. Molecules 2020; 25:molecules25112488. [PMID: 32471223 PMCID: PMC7321305 DOI: 10.3390/molecules25112488] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 05/20/2020] [Accepted: 05/21/2020] [Indexed: 12/21/2022] Open
Abstract
A series of novel styrylquinolines with the benzylidene imine moiety were synthesized and spectroscopically characterized for their applicability in cellular staining. The spectroscopic study revealed absorption in the ultraviolet-visible region (360-380 nm) and emission that covered the blue-green range of the light (above 500 nm). The fluorescence quantum yields were also determined, which amounted to 0.079 in the best-case scenario. The structural features that are behind these values are also discussed. An analysis of the spectroscopic properties and the theoretical calculations indicated the charge-transfer character of an emission, which was additionally evaluated using the Lippert-Mataga equation. Changes in geometry in the ground and excited states, which had a significant influence on the emission process, are also discussed. Additionally, the capability of the newly synthesized compounds for cellular staining was also investigated. These small molecules could effectively penetrate through the cellular membrane. Analyses of the images that were obtained with several of the tested styrylquinolines indicated their accumulation in organelles such as the mitochondria and the endoplasmic reticulum.
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Affiliation(s)
- Barbara Czaplińska
- Institute of Chemistry, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland;
| | - Katarzyna Malarz
- A. Chełkowski Institute of Physics, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland; (K.M.); (A.M.-W.)
- Silesian Center for Education and Interdisciplinary Research, University of Silesia in Katowice, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
| | - Anna Mrozek-Wilczkiewicz
- A. Chełkowski Institute of Physics, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland; (K.M.); (A.M.-W.)
- Silesian Center for Education and Interdisciplinary Research, University of Silesia in Katowice, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
| | - Aneta Slodek
- Institute of Chemistry, Faculty of Science and Technology, University of Silesia in Katowice, Szkolna 9, 40-007 Katowice, Poland; (A.S.); (M.K.)
| | - Mateusz Korzec
- Institute of Chemistry, Faculty of Science and Technology, University of Silesia in Katowice, Szkolna 9, 40-007 Katowice, Poland; (A.S.); (M.K.)
| | - Robert Musiol
- Institute of Chemistry, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland;
- Correspondence:
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11
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Li C, Wu Y, Li G, Zhang Y, Ma X, Fang Y, Li W, Tian Z. Aggregation Behavior of Acylated Pepsin-Solubilized Collagen Based on Fluorescence Spectrum Technology. APPLIED SPECTROSCOPY 2020; 74:391-399. [PMID: 32031012 DOI: 10.1177/0003702820903817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The aggregation behavior of collagen-based materials plays an important role in their processing because it could affect their physicochemical properties. Based on the intrinsic fluorescence characteristic of tyrosine, fluorescence spectrum technology was used to investigate the aggregation state of the acylated collagen molecules in aqueous solution. The results showed that the aggregate degree of the acylated collagen was higher than that of the native collagen due to the hydrophobic interaction. With the increase of concentrations of the acylated collagen or at NaCl higher than 40 mmol/L, the aggregate degree of the acylated collagen molecules increased. When the pH was close to the isoelectric point of the acylated collagen, the hydrophobic interaction and the hydrogen bond helped to increase the aggregation degree. However, with the increase of temperature (10-70 ℃), the aggregation state of the acylated collagen decreased gradually due to the quenching, the molecular collision, and the broken of hydrogen bonds. Furthermore, two-dimensional correlation spectroscopy (2D-COS) showed that the response order was 360 > 305 nm at various acylated collagen and NaCl (>40 mmol/L) concentrations, while the response order was 305 > 360 nm when the pH value was increased from 5.0 to 9.0. Temperature-dependent 2D-COS showed there were four bands that occurred and the response order was listed as follows: 293 > 305 > 360 > 420 nm. In brief, the results might provide an important guide for molding processes of the acylated collagen.
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Affiliation(s)
- Conghu Li
- The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, China
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Yan Wu
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Guoying Li
- The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, China
| | - Ying Zhang
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Xinghong Ma
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Yifan Fang
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Wenjuan Li
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Zhenhua Tian
- College of Bioresources Chemical and Materials Engineering, Shanxi University of Science and Technology, Xi'an, China
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Bansode S, Bashtanova U, Li R, Clark J, Müller KH, Puszkarska A, Goldberga I, Chetwood HH, Reid DG, Colwell LJ, Skepper JN, Shanahan CM, Schitter G, Mesquida P, Duer MJ. Glycation changes molecular organization and charge distribution in type I collagen fibrils. Sci Rep 2020; 10:3397. [PMID: 32099005 PMCID: PMC7042214 DOI: 10.1038/s41598-020-60250-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 01/27/2020] [Indexed: 02/06/2023] Open
Abstract
Collagen fibrils are central to the molecular organization of the extracellular matrix (ECM) and to defining the cellular microenvironment. Glycation of collagen fibrils is known to impact on cell adhesion and migration in the context of cancer and in model studies, glycation of collagen molecules has been shown to affect the binding of other ECM components to collagen. Here we use TEM to show that ribose-5-phosphate (R5P) glycation of collagen fibrils - potentially important in the microenvironment of actively dividing cells, such as cancer cells - disrupts the longitudinal ordering of the molecules in collagen fibrils and, using KFM and FLiM, that R5P-glycated collagen fibrils have a more negative surface charge than unglycated fibrils. Altered molecular arrangement can be expected to impact on the accessibility of cell adhesion sites and altered fibril surface charge on the integrity of the extracellular matrix structure surrounding glycated collagen fibrils. Both effects are highly relevant for cell adhesion and migration within the tumour microenvironment.
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Affiliation(s)
- Sneha Bansode
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Uliana Bashtanova
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Rui Li
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | | | - Karin H Müller
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
- Cambridge Advanced Imaging Centre, Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY, UK
| | - Anna Puszkarska
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Ieva Goldberga
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Holly H Chetwood
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - David G Reid
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Lucy J Colwell
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Jeremy N Skepper
- Cambridge Advanced Imaging Centre, Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY, UK
| | - Catherine M Shanahan
- BHF Centre of Research Excellence, Cardiovascular Division, James Black Centre King's College London, 125 Coldharbour Lane, London, SE5 9NU, UK
| | - Georg Schitter
- Automation and Control Institute (ACIN), TU Wien, Gusshausstrasse 27-29, A-1040, Vienna, Austria
| | - Patrick Mesquida
- Automation and Control Institute (ACIN), TU Wien, Gusshausstrasse 27-29, A-1040, Vienna, Austria.
- Department of Physics, King's College London, Strand, London, WC2R 2LS, UK.
| | - Melinda J Duer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
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Lagarto JL, Nickdel MB, Kelly DJ, Price A, Nanchahal J, Dunsby C, French P, Itoh Y. Autofluorescence Lifetime Reports Cartilage Damage in Osteoarthritis. Sci Rep 2020; 10:2154. [PMID: 32034262 PMCID: PMC7005742 DOI: 10.1038/s41598-020-59219-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 01/27/2020] [Indexed: 11/09/2022] Open
Abstract
Osteoarthritis (OA) is the most common arthritis and its hallmark is degradation of articular cartilage by proteolytic enzymes leading to loss of joint function. It is challenging to monitor the status of cartilage in vivo and this study explores the use of autofluorescence lifetime (AFL) measurements to provide a label-free optical readout of cartilage degradation that could enable earlier detection and evaluation of potential therapies. We previously reported that treatment of ex vivo porcine cartilage with proteolytic enzymes resulted in decreased AFL. Here we report changes in AFL of ex vivo mouse knee joints, porcine metacarpophalangeal joints, normal human metatarsophalangeal articular tissue and human OA tibial plateau tissues measured with or without treatment using a compact single-point time resolved spectrofluorometer. Our data show that proteolytically damaged areas in porcine metacarpophalangeal joints present a reduced AFL and that inducing aggrecanases in mouse and human joints also significantly reduces AFL. Further, human cartilage from OA patients presents a significantly lower AFL compared to normal human cartilage. Our data suggest that AFL can detect areas of cartilage erosion and may potentially be utilised as a minimally-invasive diagnostic readout for early stage OA in combination with arthroscopy devices.
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Affiliation(s)
- João L Lagarto
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - Mohammad B Nickdel
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, OX3 7FY, UK
| | - Douglas J Kelly
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - Andrew Price
- Botner Research Centre, University of Oxford, Oxford, OX3 7LD, UK
| | - Jagdeep Nanchahal
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, OX3 7FY, UK
| | - Chris Dunsby
- Department of Physics, Imperial College London, London, SW7 2AZ, UK.,Centre for Pathology, Imperial College London, London, SW7 2AZ, UK
| | - Paul French
- Department of Physics, Imperial College London, London, SW7 2AZ, UK.
| | - Yoshifumi Itoh
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, OX3 7FY, UK.
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14
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Real-time optical redox imaging of cartilage metabolic response to mechanical loading. Osteoarthritis Cartilage 2019; 27:1841-1850. [PMID: 31513919 DOI: 10.1016/j.joca.2019.08.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 08/27/2019] [Accepted: 08/29/2019] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Metabolic dysregulation has recently been identified as a key feature of osteoarthritis. Mechanical overloading has been postulated as a primary cause of this metabolic response. Current methods of real-time metabolic activity analysis in cartilage are limited and challenging. However, optical redox imaging leverages the autofluorescence of co-enzymes NAD(P)H and FAD to provide dye-free real-time analysis of metabolic activity. This technique has not yet been applied to cartilage. This study aimed to assess the effects of a compressive load on cartilage using optical redox imaging. METHOD Cartilage samples were excised from porcine femoral condyles. To validate this imaging modality in cartilage, glycolysis was inhibited via 2-deoxy-D-glucose (2DG) and oxidative phosphorylation was inhibited by rotenone. Optical redox images were collected pre- and post-inhibition. To assess the effects of mechanical loading, samples were subjected to a compressive load and imaged for approximately 30 min. Load and strain parameters were determined using high-speed camera images in Matlab. A range of loading magnitudes and rates were applied across samples. RESULTS 2DG and rotenone demonstrated the expected inhibitory effects on fluorescence intensity in the channels corresponding to NAD(P)H and FAD, respectively. Mechanical loading induced an increase in NAD(P)H channel fluorescence which subsided by 30 min post-loading. Magnitude of loading parameters had mixed effects on metabolites. CONCLUSIONS Optical redox imaging provides an opportunity to assess real-time metabolic activity in cartilage. This approach revealed a metabolic response to a single load and can be used to provide insight into the role of metabolism in mechanically-mediated cartilage degradation.
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15
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Abstract
A novel pro-dye approach for the acid-selective staining of the subcellular compartments for better permeability and selectivity was applied. The designed sensor has suitable physicochemical properties such as a large Stokes shift and a long-lived intracellular fluorescence. The Schiff base fragment was used for the acid-sensitive release of a fluorophore without affecting the overall stability of the biological systems. Due to the presence of an imine bond in its structure and its unique fluorescent properties, it can be presented as a “pro-dye” for acidic structures such as lysosomes. As a result of an imine bond cleavage, a new fluorescent compound is released, whose substantially shifted excitation and emission wavelengths enable a more selective and effective imaging of lysosomes and endosomes. The presented report provides the chemical, physicochemical and optical profiles as well as biological assays and theoretical calculations.
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16
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Chai Y, Okuda M, Otsuka Y, Ohnuma K, Tagaya M. Comparison of two fabrication processes for biomimetic collagen/hydroxyapatite hybrids. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2019.04.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Zhou J, Tang L, Wang JS. Assessment of the adverse impacts of aflatoxin B 1 on gut-microbiota dependent metabolism in F344 rats. CHEMOSPHERE 2019; 217:618-628. [PMID: 30447610 DOI: 10.1016/j.chemosphere.2018.11.044] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 11/04/2018] [Accepted: 11/05/2018] [Indexed: 06/09/2023]
Abstract
The adverse impacts of AFB1 on gut-microbiota dependent metabolism in F344 rats were assessed via ultra-high performance liquid chromatography (UHPLC)-profiling and UHPLC-mass spectrometry (MS) metabolomic analyses. UHPLC-profiling analysis found 1100 raw peaks from the fecal samples collected at week 4, of which 335 peaks showed peak shape qualified for quantitation. A total of 24, 40 and 71 peaks were significantly decreased (>2-fold, p < 0.05) among the exposure groups treated with 5, 25, and 75 μg AFB1 kg-1 body weight (B. W.), respectively. Supervised orthogonal partial least squares projection to latent structures-discriminant analysis revealed 11 differential peaks that may be used to predict AFB1-induced adverse changes of the metabolites. UHPLC-MS based metabolomic analysis discovered 494 features that were significantly altered by AFB1, and 234 of them were imputatively identified using Human Metabolome Data Base (HMDB). Metabolite set enrichment analysis showed that the highly disrupted metabolic pathways were: protein biosynthesis, pantothenate and CoA biosynthesis, betaine metabolism, cysteine metabolism, and methionine metabolism. Eight features were rated as indicative metabolites for AFB1 exposure: 3-decanol, xanthylic acid, norspermidine, nervonyl carnitine, pantothenol, threitol, 2-hexanoyl carnitine, and 1-nitrohexane. These data suggest that AFB1 could significantly reduce the variety of nutrients in gut and disrupt a number of gut-microbiota dependent metabolic pathways, which may contribute to the AFB1-associated stunted growth, liver diseases and the immune toxic effects that have been observed in animal models and human populations.
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Affiliation(s)
- Jun Zhou
- Interdisciplinary Toxicology Program, University of Georgia, Athens, GA 30602, United States; Department of Environmental Health Science, College of Public Health, University of Georgia, Athens, GA 30602, United States
| | - Lili Tang
- Interdisciplinary Toxicology Program, University of Georgia, Athens, GA 30602, United States; Department of Environmental Health Science, College of Public Health, University of Georgia, Athens, GA 30602, United States
| | - Jia-Sheng Wang
- Interdisciplinary Toxicology Program, University of Georgia, Athens, GA 30602, United States; Department of Environmental Health Science, College of Public Health, University of Georgia, Athens, GA 30602, United States.
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18
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Tsuboi S, Jin T. BRET based dual-colour (visible/near-infrared) molecular imaging using a quantum dot/EGFP–luciferase conjugate. RSC Adv 2019; 9:34964-34971. [PMID: 35530680 PMCID: PMC9074158 DOI: 10.1039/c9ra07011g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 10/17/2019] [Indexed: 12/25/2022] Open
Abstract
Owing to its high sensitivity, bioluminescence imaging is an important tool for biosensing and bioimaging in life sciences. Compared to fluorescence imaging, bioluminescence imaging has a superior advantage that the background signals resulting from autofluorescence are almost zero. In addition, bioluminescence imaging can permit long-term observation of living cells because external excitation is not needed, leading to no photobleaching and photocytotoxicity. Although bioluminescence imaging has such superior properties over fluorescence imaging, observation wavelengths in bioluminescence imaging are mostly limited to the visible region. Here we present bioluminescence resonance energy transfer (BRET) based dual-colour (visible/near-infrared) molecular imaging using a quantum dot (QD) and luciferase protein conjugate. This bioluminescent probe is designed to emit green and near-infrared luminescence from enhanced green fluorescent protein (EGFP) and CdSeTe/CdS (core/shell) QDs, where EGFP–Renilla luciferase (RLuc) fused proteins are conjugated to the QDs. Since the EGFP–RLuc fused protein contains an immunoglobulin binding domain (GB1) of protein G, it is possible to prepare a variety of molecular imaging probes functionalized with antibodies (IgG). We show that the BRET-based QD probe can be used for highly sensitive dual-colour (visible/near-infrared) bioluminescence molecular imaging of membrane receptors in cancer cells. A bioluminescent dual-colour molecular-imaging probe was prepared to emit green and near-infrared luminescence from a conjugate between enhanced green fluorescent protein (EGFP), Renilla luciferase (RLuc) and CdSeTe/CdS quantum dot (QD).![]()
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Affiliation(s)
- Setsuko Tsuboi
- RIKEN Center for Biosystems Dynamics Research (BDR)
- Osaka 565-0874
- Japan
| | - Takashi Jin
- RIKEN Center for Biosystems Dynamics Research (BDR)
- Osaka 565-0874
- Japan
- Graduate School of Frontier Biosciences
- Osaka University
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19
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Double Assurance of Epidural Space Detection Using Fiberoptics-Based Needle Design and Autofluorescence Technologies for Epidural Blockade in Painless Labor. SENSORS 2018; 18:s18113592. [PMID: 30360473 PMCID: PMC6264018 DOI: 10.3390/s18113592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 09/24/2018] [Accepted: 10/19/2018] [Indexed: 11/17/2022]
Abstract
Purpose: Technology of reflectance spectroscopy incorporated with auto-fluorescence spectroscopy were employed to increase the safety of epidural placement in regional anesthesia which is generally used for surgery, epidural anesthesia, post-operative pain control and painless childbirth. Method: Ex vivo study of auto-fluorescence spectroscopy was performed for the para-vertebral tissues contained fat, interspinous ligament, supraspinous ligament and ligamentumflavum by multimode microplate reader at wavelength 405 nm for the purpose of tissue differentiation. A specially designed optic-fiber-embedded needle was employed to incorporate with both reflectance and autofluorescence spectroscopies in order to probe the epidural space as double assurance demands. In vivo study was carried out in a Chinese native swine weighted about 30 kg under intubated general anesthesia with ventilation support. The reflective (405 nm) and autofluorescence signals (λ and λ*) were recorded at 5 different sites by an oscilloscope during the needle puncture procedure from skin to epidural space in the back of the swine. Results: Study of either autofluorescence spectroscopy for tissue samples or ex vivo needle puncture in porcine trunk tissues indicates that ligmentumflavum has at least 10-fold higher fluorescence intensity than the other tissues. In the in vivo study, ligamentumflavum shows a double-peak character for both reflectance and autofluorescence signals. The epidural space is located right after the drop from the double-peak. Both peaks of reflectance and fluorescence are coincident which ensures that the epidural space is correctly detected. Conclusions: The fiber-optical technologies of double-assurance demands for tissue discrimination during epidural needle puncture can not only provide an objective visual information in a real-time fashion but also it can help the operator to achieve much higher success rate in this anesthesia procedure.
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20
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The Characteristics of Intrinsic Fluorescence of Type I Collagen Influenced by Collagenase I. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8101947] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The triple helix structure of collagen can be degraded by collagenase. In this study, we explored how the intrinsic fluorescence of type I collagen was influenced by collagenase I. We found that tyrosine was the main factor that could successfully excite the collagen fluorescence. Initially, self-assembly behavior of collagen resulted in a large amount of tyrosine wrapped with collagen, which decreased the fluorescence intensity of type I collagen. After collagenase cleavage, some wrapped-tyrosine could be exposed and thereby the intrinsic fluorescence intensity of collagen increased. By observation and analysis, the influence of collagenase to intrinsic fluorescence of collagen was investigated and elaborated. Furthermore, collagenase cleavage to the special triple helix structure of collagen would result in a slight improvement of collagen thermostability, which was explained by the increasing amount of terminal peptides. These results are helpful and effective for reaction mechanism research related to collagen, which can be observed by fluorescent technology. Meantime, the reaction behaviors of both collagenase and collagenolytic proteases can also be analyzed by fluorescent technology. In conclusion, this research provides a foundation for the further investigation of collagen reactions in different areas, such as medicine, nutrition, food and agriculture.
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21
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McKay G, Korak JA, Rosario-Ortiz FL. Temperature Dependence of Dissolved Organic Matter Fluorescence. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:9022-9032. [PMID: 30028602 DOI: 10.1021/acs.est.8b00643] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The temperature dependence of organic matter fluorescence apparent quantum yields (Φf) was measured for a diverse set of organic matter isolates (i.e., marine aquatic, microbial aquatic, terrestrial aquatic, and soil) in aqueous solution and for whole water samples to determine apparent activation energies ( Ea) for radiationless decay processes of the excited singlet state. Ea was calculated from temperature dependent Φf data obtained by steady-state methods using a simplified photophysical model and the Arrhenius equation. All aquatic-derived isolates, all whole water samples, and one soil-derived fulvic acid isolate exhibited temperature dependent Φf values, with Ea ranging from 5.4 to 8.4 kJ mol-1 at an excitation wavelength of 350 nm. Conversely, soil humic acid isolates exhibited little or no temperature dependence in Φf. Ea varied with excitation wavelength in most cases, typically exhibiting a decrease between 350 and 500 nm. The narrow range of Ea values observed for these samples when compared to literature Ea values for model fluorophores (∼5-30 kJ mol-1) points to a similar photophysical mechanism for singlet excited states nonradiative inactivation across organic matter isolates of diverse source and character. In addition, this approach to temperature dependent fluorescence analysis provides a fundamental, physical basis, in contrast to existing empirical relationships, for correcting online fluorescence sensors for temperature effects.
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Affiliation(s)
- Garrett McKay
- Department of Civil, Environmental, and Architectural Engineering , University of Colorado , Boulder , Colorado 80309 , United States
| | - Julie A Korak
- Department of Civil, Environmental, and Architectural Engineering , University of Colorado , Boulder , Colorado 80309 , United States
| | - Fernando L Rosario-Ortiz
- Department of Civil, Environmental, and Architectural Engineering , University of Colorado , Boulder , Colorado 80309 , United States
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22
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Vas WJ, Shah M, Blacker TS, Duchen MR, Sibbons P, Roberts SJ. Decellularized Cartilage Directs Chondrogenic Differentiation: Creation of a Fracture Callus Mimetic. Tissue Eng Part A 2018; 24:1364-1376. [PMID: 29580181 DOI: 10.1089/ten.tea.2017.0450] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Complications that arise from impaired fracture healing have considerable socioeconomic implications. Current research in the field of bone tissue engineering predominantly aims to mimic the mature bone tissue microenvironment. This approach, however, may produce implants that are intrinsically unresponsive to the cues present during the initiation of fracture repair. As such, this study describes the development of decellularized xenogeneic hyaline cartilage matrix in an attempt to mimic the initial reparative phase of fracture repair. Three approaches based on vacuum-assisted osmotic shock (Vac-OS), Triton X-100 (Vac-STx), and sodium dodecyl sulfate (Vac-SDS) were investigated. The Vac-OS methodology reduced DNA content below 50 ng/mg of tissue, while retaining 85% of the sulfate glycosaminoglycan content, and as such was selected as the optimal methodology for decellularization. The resultant Vac-OS scaffolds (decellularized extracellular matrix [dcECM]) were also devoid of the immunogenic alpha-Gal epitope. Furthermore, minimal disruption to the structural integrity of the dcECM was demonstrated using differential scanning calorimetry and fluorescence lifetime imaging microscopy. The biological integrity of the dcECM was confirmed by its ability to drive the chondrogenic commitment and differentiation of human chondrocytes and periosteum-derived cells, respectively. Furthermore, histological examination of dcECM constructs implanted in immunocompetent mice revealed a predominantly M2 macrophage-driven regenerative response both at 2 and 8 weeks postimplantation. These findings contrasted with the implanted native costal cartilage that elicited a predominantly M1 macrophage-mediated inflammatory response. This study highlights the capacity of dcECM from the Vac-OS methodology to direct the key biological processes of endochondral ossification, thus potentially recapitulating the callus phase of fracture repair.
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Affiliation(s)
- Wollis J Vas
- 1 Department of Materials and Tissue, Institute of Orthopaedics and Musculoskeletal Science, University College London , Stanmore, United Kingdom
| | - Mittal Shah
- 1 Department of Materials and Tissue, Institute of Orthopaedics and Musculoskeletal Science, University College London , Stanmore, United Kingdom
| | - Thomas S Blacker
- 2 Department of Cell and Developmental Biology, University College London , London, United Kingdom .,3 Department of Physics and Astronomy, University College London , London, United Kingdom
| | - Michael R Duchen
- 2 Department of Cell and Developmental Biology, University College London , London, United Kingdom
| | - Paul Sibbons
- 4 Northwick Park Institute for Medical Research , Northwick Park Hospital, London, United Kingdom
| | - Scott J Roberts
- 1 Department of Materials and Tissue, Institute of Orthopaedics and Musculoskeletal Science, University College London , Stanmore, United Kingdom
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23
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Tsuboi S, Jin T. Recombinant Protein (Luciferase-IgG Binding Domain) Conjugated Quantum Dots for BRET-Coupled Near-Infrared Imaging of Epidermal Growth Factor Receptors. Bioconjug Chem 2018. [DOI: 10.1021/acs.bioconjchem.8b00149] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Setsuko Tsuboi
- Quantitative Biology Center, RIKEN, Furuedai 6-2-3, Suita, Osaka 565-0874, Japan
| | - Takashi Jin
- Quantitative Biology Center, RIKEN, Furuedai 6-2-3, Suita, Osaka 565-0874, Japan
- Graduate School of Frontier Biosciences, Osaka University, Yamada-oka 2-1, Suita, Osaka 565-0871, Japan
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24
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Zhang KY, Yu Q, Wei H, Liu S, Zhao Q, Huang W. Long-Lived Emissive Probes for Time-Resolved Photoluminescence Bioimaging and Biosensing. Chem Rev 2018; 118:1770-1839. [DOI: 10.1021/acs.chemrev.7b00425] [Citation(s) in RCA: 479] [Impact Index Per Article: 79.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Kenneth Yin Zhang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, P. R. China
| | - Qi Yu
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, P. R. China
| | - Huanjie Wei
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, P. R. China
| | - Shujuan Liu
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, P. R. China
| | - Qiang Zhao
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, P. R. China
| | - Wei Huang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, P. R. China
- Shaanxi
Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi’an 710072, P. R. China
- Key
Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced
Materials (IAM), Jiangsu National Synergetic Innovation Center for
Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), Nanjing 211800, P. R. China
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25
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Laser-induced autofluorescence-based objective evaluation of burn tissue repair in mice. Lasers Med Sci 2017; 33:699-707. [DOI: 10.1007/s10103-017-2371-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 10/22/2017] [Indexed: 11/26/2022]
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26
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Fields M, Spencer N, Dudhia J, McMillan PF. Structural changes in cartilage and collagen studied by high temperature Raman spectroscopy. Biopolymers 2017; 107. [DOI: 10.1002/bip.23017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 02/16/2017] [Accepted: 02/16/2017] [Indexed: 02/02/2023]
Affiliation(s)
- Mark Fields
- Department of Chemistry; University College London; 20 Gordon Street London WC1H 0AJ United Kingdom
| | - Nicholas Spencer
- WestCHEM, School of Chemistry, Joseph Black Building; University of Glasgow; Glasgow G12 9QQ United Kingdom
| | - Jayesh Dudhia
- Department of Clinical Sciences and Services; The Royal Veterinary College; Hawkshead Lane, North Mymms, Hatfield Herts AL9 7TA United Kingdom
| | - Paul F. McMillan
- Department of Chemistry; University College London; 20 Gordon Street London WC1H 0AJ United Kingdom
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27
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Kezwoń A, Góral I, Frączyk T, Wojciechowski K. Effect of surfactants on surface activity and rheological properties of type I collagen at air/water interface. Colloids Surf B Biointerfaces 2016; 148:238-248. [PMID: 27616064 DOI: 10.1016/j.colsurfb.2016.08.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 07/25/2016] [Accepted: 08/30/2016] [Indexed: 01/22/2023]
Abstract
We describe the effect of three synthetic surfactants (anionic - sodium dodecyl sulfate (SDS), cationic - cetyltrimethylammonium bromide (CTAB) and nonionic - Triton X-100 (TX-100)) on surface properties of the type I calf skin collagen at the air/water interface in acidic solutions (pH 1.8). The protein concentration was fixed at 5×10-6molL-1 and the surfactant concentration was varied in the range 5×10-6molL-1-1×10-4molL-1, producing the protein/surfactant mixtures with molar ratios of 1:1, 1:2, 1:5, 1:10 and 1:20. An Axisymmetric Drop Shape Analysis (ADSA) method was used to determine the dynamic surface tension and surface dilatational moduli of the mixed adsorption layers. Two spectroscopic techniques: UV-vis spectroscopy and fluorimetry allowed us to determine the effect of the surfactants on the protein structure. The thermodynamic characteristic of the mixtures was studied using isothermal titration calorimetry (ITC) and differential scanning calorimetry (DSC). Modification of the collagen structure by SDS at low surfactant/protein ratios has a positive effect on the mixture's surface activity with only minor deterioration of the rheological properties of the adsorbed layers. The collagen/CTAB mixtures do not show that pronounced improvement in surface activity, while rheological properties are significantly deteriorated. The mixtures with non-ionic TX-100 do not show any synergistic effects in surface activity.
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Affiliation(s)
- Aleksandra Kezwoń
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
| | - Ilona Góral
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
| | - Tomasz Frączyk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - Kamil Wojciechowski
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland.
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28
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Han JH, Jo YG, Kim JC, Lee JB, Kim YC, Kang H, Hwang IW. Contrast agent free detection of bowel perforation using chlorophyll derivatives from food plants. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2015.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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29
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Qian J, Okada Y, Ogura T, Tanaka K, Hattori S, Ito S, Satoh J, Takita T, Yasukawa K. Kinetic Analysis of the Digestion of Bovine Type I Collagen Telopeptides with Porcine Pepsin. J Food Sci 2015; 81:C27-34. [DOI: 10.1111/1750-3841.13179] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 11/06/2015] [Indexed: 12/22/2022]
Affiliation(s)
- Jun Qian
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
| | - Yukari Okada
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
| | - Takayuki Ogura
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
| | - Keisuke Tanaka
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
| | - Shunji Hattori
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
| | - Shinji Ito
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
| | - Junko Satoh
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
| | - Teisuke Takita
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
| | - Kiyoshi Yasukawa
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are with Div. of Food Science and Biotechnology; Graduate School of Agriculture; Kyoto Univ; Sakyo-ku Kyoto 606-8502 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Nippi Research Inst. of Biomatrix; 520-11, Kuwabara Toride Ibaraki 302-0017 Japan
- Authors Qian, Okada, Ogura, Tanaka, Hattori, Ito, Satoh, Takita, and Yasukawa are also with Medical Research Support Center; Graduate School of Medicine; Kyoto Univ; Yoshida Konoe-cho, Sakyo-ku Kyoto 606-8501 Japan
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Chen Y, Bai Y, Han Z, He W, Guo Z. Photoluminescence imaging of Zn2+in living systems. Chem Soc Rev 2015; 44:4517-46. [DOI: 10.1039/c5cs00005j] [Citation(s) in RCA: 195] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Advances in PL imaging techniques, such as confocal microscopy, two photon microscopy, lifetime and optical imaging techniques, have made remarkable contributions in Zn2+tracking.
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Affiliation(s)
- Yuncong Chen
- State Key Laboratory of Coordination Chemistry
- Coordination Chemistry Institute
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Yang Bai
- State Key Laboratory of Coordination Chemistry
- Coordination Chemistry Institute
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Zhong Han
- State Key Laboratory of Coordination Chemistry
- Coordination Chemistry Institute
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Weijiang He
- State Key Laboratory of Coordination Chemistry
- Coordination Chemistry Institute
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Zijian Guo
- State Key Laboratory of Coordination Chemistry
- Coordination Chemistry Institute
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
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Leighton GO, Konnova TA, Idiyatullin B, Hurr SH, Zuev YF, Nesmelova IV. The folding of the specific DNA recognition subdomain of the sleeping beauty transposase is temperature-dependent and is required for its binding to the transposon DNA. PLoS One 2014; 9:e112114. [PMID: 25375127 PMCID: PMC4222973 DOI: 10.1371/journal.pone.0112114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 10/13/2014] [Indexed: 12/26/2022] Open
Abstract
The reaction of DNA transposition begins when the transposase enzyme binds to the transposon DNA. Sleeping Beauty is a member of the mariner family of DNA transposons. Although it is an important tool in genetic applications and has been adapted for human gene therapy, its molecular mechanism remains obscure. Here, we show that only the folded conformation of the specific DNA recognition subdomain of the Sleeping Beauty transposase, the PAI subdomain, binds to the transposon DNA. Furthermore, we show that the PAI subdomain is well folded at low temperatures, but the presence of unfolded conformation gradually increases at temperatures above 15°C, suggesting that the choice of temperature may be important for the optimal transposase activity. Overall, the results provide a molecular-level insight into the DNA recognition by the Sleeping Beauty transposase.
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Affiliation(s)
- Gage O. Leighton
- Department of Physics and Optical Science, University of North Carolina, Charlotte, North Carolina, United States of America
| | - Tatiana A. Konnova
- Department of Physics and Optical Science, University of North Carolina, Charlotte, North Carolina, United States of America
- Kazan Institute of Biochemistry and Biophysics, Kazan, Russian Federation
| | - Bulat Idiyatullin
- Kazan Institute of Biochemistry and Biophysics, Kazan, Russian Federation
| | - Sophia H. Hurr
- Department of Physics and Optical Science, University of North Carolina, Charlotte, North Carolina, United States of America
| | - Yuriy F. Zuev
- Kazan Institute of Biochemistry and Biophysics, Kazan, Russian Federation
| | - Irina V. Nesmelova
- Department of Physics and Optical Science, University of North Carolina, Charlotte, North Carolina, United States of America
- Center for Biomedical Engineering and Science, University of North Carolina, Charlotte, North Carolina, United States of America
- * E-mail:
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Shin MK, Choi JH, Ahn SB, Lee MH. Histologic comparison of microscopic treatment zones induced by fractional lasers and radiofrequency. J COSMET LASER THER 2014; 16:317-23. [PMID: 25148410 DOI: 10.3109/14764172.2014.957216] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Fractional photothermolysis induces microscopic, localized thermal injury in the skin surrounded by undamaged viable tissue in order to promote wound healing. OBJECTIVE This study evaluated acute histologic changes following each single pass of various fractional lasers and radiofrequency (RF). METHODS Three male domestic swine were used. We used fractional Erbium:glass (Er:glass), Erbium:yttrium-aluminum-garnet (Er:YAG), CO2 lasers, and fractional ablative microplasma RF. We analyzed features and average values of the diameter, depth, and vertical sectional areas treated with each kind of laser and RF. RESULTS The microscopic treatment zone (MTZ) of fractional Er:glass resulted in separation of dermoepidermal junction with no ablative zone. Fractional Er:YAG provided the most superficial and broad MTZ with little thermal collateral damage. Fractional CO2 resulted in a narrow and deep "cone"-like MTZ. Fractional RF resulted in a superficial and broad "crater"-like MTZ. CONCLUSIONS This study provides the first comparison of MTZs induced by various fractional lasers and RF. These data provide basic information on proper laser and RF options. We think that these findings could be a good reference for information about fractional laser-assisted drug delivery.
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Affiliation(s)
- Min-Kyung Shin
- Department of Dermatology, College of Medicine, Kyung Hee University , Seoul , Republic of Korea
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Hu JB, Chen SY, Wu JT, Chen YC, Urban PL. Automated system for extraction and instantaneous analysis of millimeter-sized samples. RSC Adv 2014. [DOI: 10.1039/c3ra48023b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Salehi H, Terrer E, Panayotov I, Levallois B, Jacquot B, Tassery H, Cuisinier F. Functional mapping of human sound and carious enamel and dentin with Raman spectroscopy. JOURNAL OF BIOPHOTONICS 2013; 6:765-774. [PMID: 22996995 DOI: 10.1002/jbio.201200095] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 07/22/2012] [Accepted: 07/30/2012] [Indexed: 06/01/2023]
Abstract
The goals of this trial were, first, to produce a Raman mapping of decay and sound dentin samples, through accurate analysis of the Raman band spectra variations of mineral and organic components. The second goal was to confirm the correlation between the Raman signal and the signal of a fluorescent camera, by assaying the concentration of pentosidine and natural collagen fluorescent crosslink using reverse phase high-pressure liquid chromatography. The first correlation assumed a possible relationship between the signal observed with the camera and Raman spectroscopy. The second correlation assumed an association with the Maillard reaction. Absence of a correlation for this trial was that no association could be found between Raman spectra characteristics, fluorescence variation and the HPLC assay. Our results void this absence.
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Affiliation(s)
- Hamideh Salehi
- Laboratory of Biology and Nano-science, EA4203, Montpellier University 1, 545 av du Pr Viala, 34193 cedex 5, Montpellier, France
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Manning HB, Nickdel MB, Yamamoto K, Lagarto JL, Kelly DJ, Talbot CB, Kennedy G, Dudhia J, Lever J, Dunsby C, French P, Itoh Y. Detection of cartilage matrix degradation by autofluorescence lifetime. Matrix Biol 2013; 32:32-8. [DOI: 10.1016/j.matbio.2012.11.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 09/18/2012] [Accepted: 11/29/2012] [Indexed: 12/01/2022]
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Walsh AJ, Masters DB, Jansen ED, Welch AJ, Mahadevan-Jansen A. The effect of temperature on the autofluorescence of scattering and non-scattering tissue. Lasers Surg Med 2012; 44:712-8. [PMID: 23037939 DOI: 10.1002/lsm.22080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/04/2012] [Indexed: 11/09/2022]
Abstract
BACKGROUND AND OBJECTIVES With the increasing use of fluorescence in medical applications, a comprehensive understanding of the effect of temperature on tissue autofluorescence is essential. The purpose of this study is to explore the effect of temperature on the fluorescence of porcine cornea and rat skin and determine the relative contributions of irreversible changes in optical properties and in fluorescence yield. STUDY DESIGN/MATERIALS AND METHODS Fluorescence, diffuse reflectance, and temperature measurements were acquired from excised porcine cornea and rat skin over a temperature range of 0-80 °C. A dual excitation system was used with a 337 nm pulsed nitrogen laser for the fluorescence and a white light source for the diffuse reflectance measurements. A thermal camera measured tissue temperature. Optical property changes were inferred from diffuse reflectance measurements. The reversibility of the change in fluorescence was examined by acquiring measurements while the tissue sample cooled from the highest induced temperature to room temperature. RESULTS The fluorescence intensity decreased with increasing tissue temperature. This fluorescence change was reversible when the tissue was heated to a temperature of 45 °C, but irreversible when heated to a temperature of 80 °C. CONCLUSION Auto-fluorescence intensity dependence on temperature appears to be a combination of temperature-induced optical property changes and reduced fluorescence quantum yield due to changes in collagen structure. Temperature-induced changes in measured fluorescence must be taken into consideration in applications where fluorescence is used to diagnose disease or guide therapy.
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Affiliation(s)
- Alex J Walsh
- Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee 37235, USA
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Endogenous fluorescence signatures in living pluripotent stem cells change with loss of potency. PLoS One 2012; 7:e43708. [PMID: 22952742 PMCID: PMC3430704 DOI: 10.1371/journal.pone.0043708] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Accepted: 07/25/2012] [Indexed: 12/22/2022] Open
Abstract
The therapeutic potential of stem cells is limited by the non-uniformity of their phenotypic state. Thus it would be advantageous to noninvasively monitor stem cell status. Driven by this challenge, we employed multidimensional multiphoton microscopy to quantify changes in endogenous fluorescence occurring with pluripotent stem cell differentiation. We found that global and cellular-scale fluorescence lifetime of human embryonic stem cells (hESC) and murine embryonic stem cells (mESC) consistently decreased with differentiation. Less consistent were trends in endogenous fluorescence intensity with differentiation, suggesting intensity is more readily impacted by nuances of species and scale of analysis. What emerges is a practical and accessible approach to evaluate, and ultimately enrich, living stem cell populations based on changes in metabolism that could be exploited for both research and clinical applications.
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Reicks C, Groathouse J, Trauernicht M, Sikich S, Wilson MV, Holmes AE, Jackson AJ. Wild Plum: novel blue fluorescent compounds capable of luminosity restoration in sun-exposed skin. Skin Res Technol 2012; 19:e465-72. [PMID: 22882649 DOI: 10.1111/j.1600-0846.2012.00666.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Accepted: 07/04/2012] [Indexed: 11/30/2022]
Abstract
BACKGROUND Novel, blue fluorescent solids referred to as Wild Plum compounds can camouflage skin imperfections when incorporated into cosmetic products. We evaluated the relationship between sun exposure and skin fluorescence and determined if the application of Wild Plum formulations could restore lost fluorescence without harming the skin. METHODS The forehead skin of two groups of volunteers of mixed gender and age was examined for fluorescence and redness. In addition, subjects answered questions describing any adverse sensations they experienced after their skin was exposed to Wild Plum formulations for extended periods of time. RESULTS Fluorescence measurements of both solar and non-solar skin indicated that repeated sun exposure causes a loss of skin fluorescence. Application of Wild Plum formulations caused an increase in skin fluorescence at all concentrations, restoring solar skin fluorescence to values well beyond that of non-solar skin. Photo analysis and interview questions indicated that these formulations did not cause any symptoms of irritancy. CONCLUSION Wild Plum compounds have the ability to restore fluorescence of solar skin to a level significantly higher than that associated with non-solar skin. Skin appears more luminous and therefore more youthful. This fluorescence restoration is achieved at relatively low concentrations, without any harmful side effects.
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Affiliation(s)
- Cassie Reicks
- Department of Chemistry, Doane College, Crete, NE, US.
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Zhu S, Dorh N, Zhang J, Vegesna G, Li H, Luo FT, Tiwari A, Liu H. Highly water-soluble neutral near-infrared emissive BODIPY polymeric dyes. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm14920f] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Starnes AM, Jou PC, Molitoris JK, Lam M, Baron ED, Garcia-Zuazaga J. Acute effects of fractional laser on photo-aged skin. Dermatol Surg 2011; 38:51-7. [PMID: 22093071 DOI: 10.1111/j.1524-4725.2011.02136.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Nonablative fractional photothermolysis (FP) laser treatment has shown clinical efficacy on photo-aged skin. Few studies have examined the molecular responses to FP. OBJECTIVE To characterize the dynamic alterations involved in dermal matrix remodeling after FP laser treatment. METHODS A single multipass FP treatment was performed. Baseline, day 1, and day 7 biopsies were obtained. Biopsies were sectioned and stained for histology and immunofluorescence confocal microscopic. Heat shock protein-70 (HSP-70) and matrix metalloproteinase-1 (MMP-1) expression and extracellular matrix (ECM) autofluorescence were examined. Quantitative real-time polymerase chain reaction (qRT-PCR) experiments were performed probing for collagen 1A1 (COL1A1) and COL3A1. RESULTS All three patients were Caucasian women aged 49, 62, and 64 with Fitzpatrick skin types II, III, and IV. Transient neutrophilic infiltration found on day 1. Protein expression of HSP-70 and MMP-1 were up-regulated on day 1, reverting to baseline by day 7. ECM autofluorescence decreased from baseline to day 7. qRT-PCR showed a minor decrease in COL1A1 and COL3A1 messenger RNA 1 day after treatment. Variable results between patients receiving equal treatment were evident.
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Affiliation(s)
- Autumn M Starnes
- Department of Dermatology, University Hospitals of Case Medical Center, Case Western Reserve University, Cleveland, Ohio, USA
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Li J, Li G. The thermal behavior of collagen in solution: Effect of glycerol and 2-propanol. Int J Biol Macromol 2011; 48:364-8. [DOI: 10.1016/j.ijbiomac.2010.12.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Revised: 12/16/2010] [Accepted: 12/16/2010] [Indexed: 11/17/2022]
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Tenboll A, Darvish B, Hou W, Duwez AS, Dixon SJ, Goldberg HA, Grohe B, Mittler S. Controlled deposition of highly oriented type I collagen mimicking in vivo collagen structures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:12165-12172. [PMID: 20560559 DOI: 10.1021/la1018136] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The structural arrangement of type I collagen in vivo is critical for the normal functioning of tissues, such as bone, cornea, and blood vessels. At present, there are no low-cost techniques for fabricating aligned collagen structures for applications in regenerative medicine. Here, we report a straightforward approach to fabricate collagen films, with defined orientation of collagen fibrillar aggregates within a matrix of oriented collagen molecules. Langmuir-Blodgett (LB) technology was used to deposit thin films of oriented type I collagen onto substrates. It was found that collagen does not behave like classical LB materials, such as amphiphilic hydrocarbon acids or lipids. The thickness of the deposited collagen films and the area-pressure isotherms were found to depend on the amount of material spread. In addition, no film collapse was detected and the deposited LB films were thicker than the theoretical dimension of a collagen monolayer (1.5 nm) formed by triple helical collagen molecules. Individual LB films with thicknesses of up to 20 nm were obtained, and multiple depositions yielded overall film thicknesses of up to 100 nm. Films consisted of a matrix of collagen molecules containing thicker fibrillar aggregates of collagen (micrometers in length). These fibrillar aggregates were built up of shorter unit molecules forming "spun thread" structures, some of which exhibited a zigzag pattern. In addition to aligning collagen unidirectionally (similar for example to tendon), we performed a two-step deposition procedure, in which the substrate was turned 90 degrees between two consecutive collagen deposition steps. The resulting films showed orthogonally aligned collagen layers, mimicking the structure of cornea. Thus, this technique permits control of the thickness of individual layers, the orientation of successive layers, and the number of layers within the construct. Therefore, it may have widespread applicability for the engineering of collagen-rich tissues.
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Affiliation(s)
- Annabell Tenboll
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada, N6A 3K7
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Affiliation(s)
- Mikhail Y. Berezin
- Department of Radiology, Washington University School of Medicine, 4525 Scott Ave, St. Louis, USA, Tel. 314-747-0701, 314-362-8599, fax 314-747-5191
| | - Samuel Achilefu
- Department of Radiology, Washington University School of Medicine, 4525 Scott Ave, St. Louis, USA, Tel. 314-747-0701, 314-362-8599, fax 314-747-5191
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Menter JM, Chu EG, Martin NV. Temperature dependence of photochemical fluorescence fading in Skh-1 hairless mouse collagen. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2009; 25:128-31. [PMID: 19438990 DOI: 10.1111/j.1600-0781.2009.00421.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Type I mammalian collagens have several photolabile fluorescent moieties that absorb UV rays capable of reaching the dermis. We studied the temperature dependence of fluorescence fading as a marker of photochemical damage. METHODS Collagen solutions were exposed to radiation from 0 to 240 min from either a UVG-11 hand lamp, total dose=1.173 x 10(3) J/m(2); a UVL-21 hand lamp total dose=2.030 x 10(3) J/m(2); or the fluorometer, at 325+/-5 nm, total dose=0.156 x 10(3) J/m(2). We recorded intensities at excitation/emission wavelengths 270/300, 270/330, 270/360, 270/400, 325/400, and 370/450 nm at T=9.0-59.3 degrees C. RESULTS Results indicated simultaneous forward and reverse reactions. However, the 270/360 nm fluorophore could be analyzed as a second-order reaction. The Arrhenius curve showed two straight lines intersecting near the denaturation temperature, with helix activation energy E(a) approximately 0 and coil E(a)=7.6+/-0.6 kcal/mol (31.7+/-2.5 kJ/mol). DISCUSSION Collagen-bound fluorophores are not just passive markers of oxidative stress and age-related damage. Their photolability to wavelengths reaching the dermis may result in pathological conditions, particularly at elevated body temperatures.
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Affiliation(s)
- Julian M Menter
- Department of Microbiology/Biochemistry/Immunology, Morehouse School of Medicine, Atlanta, GA 30310-1495, USA.
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Jin H, Heller DA, Kim JH, Strano MS. Stochastic analysis of stepwise fluorescence quenching reactions on single-walled carbon nanotubes: single molecule sensors. NANO LETTERS 2008; 8:4299-4304. [PMID: 19367966 DOI: 10.1021/nl802010z] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The 1D quantum confinement of photogenerated excitons in single-walled carbon nanotubes (SWNT) can amplify the detection of molecular adsorption to where single-molecule discrimination is realizable, even from within living cells and tissues. Toward this aim, we present a type 1 collagen film, similar to those used as 3D cell scaffolds for tissue engineering, containing embedded SWNT capable of reporting single-molecule adsorption of quenching molecules. We utilize hidden Markov modeling to link single-molecule adsorption events to rate constants for H2O2, H+, and Fe(CN)6(3-). Among the three kinds of reactant molecules studied, H2O2 has the highest quenching equilibrium constant of 1.59 at 20 microM, whereas H+ is so insensitive that a similar equilibrium constant is achieved only with a concentration of 0.1 M (pH 1). The results were self-consistent because reverse (unquenching) rate constants (600 micros(-1) for H2O2, 1130 micros(-1) for H+ and 4000 micros(-1) for Fe(CN)6(3-)) were observed to be concentration-independent and the forward (quenching) rate constants varied monotonically with concentration. The quenching rate constants also increased with an increase in the redox potential of the quencher, indicating that electron transfer increases the adsorption equilibrium constant on the nanotube surface and, hence, the dwell time of the quencher. These developments provide the material, analytical, and mechanistic groundwork for SWNT to function as single-molecule stochastic biosensors.
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Affiliation(s)
- Hong Jin
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Nucci NV, Scott JN, Vanderkooi JM. Coupling of complex aromatic ring vibrations to solvent through hydrogen bonds: effect of varied on-ring and off-ring hydrogen-bonding substitutions. J Phys Chem B 2008; 112:4022-35. [PMID: 18331017 DOI: 10.1021/jp0758770] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this study, we examine the coupling of a complex ring vibration to solvent through hydrogen-bonding interactions. We compare phenylalanine, tyrosine, l-dopa, dopamine, norepinephrine, epinephrine, and hydroxyl-dl-dopa, a group of physiologically important small molecules that vary by single differences in H-bonding substitution. By examination of the temperature dependence of infrared absorptions of these molecules, we show that complex, many-atom vibrations can be coupled to solvent through hydrogen bonds and that the extent of that coupling is dependent on the degree of both on- and off-ring H-bonding substitution. The coupling is seen as a temperature-dependent frequency shift in infrared spectra, but the determination of the physical origin of that shift is based on additional data from temperature-dependent optical experiments and ab initio calculations. The optical experiments show that these small molecules are most sensitive to their immediate H-bonding environment rather than to bulk solvent properties. Ab initio calculations demonstrate H-bond-mediated vibrational coupling for the system of interest and also show that the overall small molecule solvent dependence is determined by a complex interplay of specific interactions and bulk solvation characteristics. Our findings indicate that a full understanding of biomolecule vibrational properties must include consideration of explicit hydrogen-bonding interactions with the surrounding microenvironment.
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Affiliation(s)
- Nathaniel V Nucci
- Department of Biochemistry and Biophysics, University of Pennsylvania, 422 Curie Boulevard, Philadelphia, Pennsylvania 19104, USA.
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