1
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Debruyne A, Okkelman IA, Heymans N, Pinheiro C, Hendrix A, Nobis M, Borisov SM, Dmitriev RI. Live Microscopy of Multicellular Spheroids with the Multimodal Near-Infrared Nanoparticles Reveals Differences in Oxygenation Gradients. ACS NANO 2024; 18:12168-12186. [PMID: 38687976 PMCID: PMC11100290 DOI: 10.1021/acsnano.3c12539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 04/06/2024] [Accepted: 04/15/2024] [Indexed: 05/02/2024]
Abstract
Assessment of hypoxia, nutrients, metabolite gradients, and other hallmarks of the tumor microenvironment within 3D multicellular spheroid and organoid models represents a challenging analytical task. Here, we report red/near-infrared (NIR) emitting cell staining with O2-sensitive nanoparticles, which enable measurements of spheroid oxygenation on a conventional fluorescence microscope. Nanosensor probes, termed "MMIR" (multimodal infrared), incorporate an NIR O2-sensitive metalloporphyrin (PtTPTBPF) and deep red aza-BODIPY reference dyes within a biocompatible polymer shell, allowing for oxygen gradient quantification via fluorescence ratio and phosphorescence lifetime readouts. We optimized staining techniques and evaluated the nanosensor probe characteristics and cytotoxicity. Subsequently, we applied nanosensors to the live spheroid models based on HCT116, DPSCs, and SKOV3 cells, at rest, and treated with drugs affecting cell respiration. We found that the growth medium viscosity, spheroid size, and formation method influenced spheroid oxygenation. Some spheroids produced from HCT116 and dental pulp stem cells exhibited "inverted" oxygenation gradients, with higher core oxygen levels than the periphery. This contrasted with the frequently encountered "normal" gradient of hypoxia toward the core caused by diffusion. Further microscopy analysis of spheroids with an "inverted" gradient demonstrated metabolic stratification of cells within spheroids: thus, autofluorescence FLIM of NAD(P)H indicated the formation of a glycolytic core and localization of OxPhos-active cells at the periphery. Collectively, we demonstrate a strong potential of NIR-emitting ratiometric nanosensors for advanced microscopy studies targeting live and quantitative real-time monitoring of cell metabolism and hypoxia in complex 3D tissue models.
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Affiliation(s)
- Angela
C. Debruyne
- Tissue
Engineering and Biomaterials Group, Department of Human Structure
and Repair, Faculty of Medicine and Health Sciences, Ghent University, C. Heymanslaan 10, 9000 Ghent, Belgium
| | - Irina A. Okkelman
- Tissue
Engineering and Biomaterials Group, Department of Human Structure
and Repair, Faculty of Medicine and Health Sciences, Ghent University, C. Heymanslaan 10, 9000 Ghent, Belgium
- Ghent
Light
Microscopy Core, Ghent University, 9000 Ghent, Belgium
| | - Nina Heymans
- Tissue
Engineering and Biomaterials Group, Department of Human Structure
and Repair, Faculty of Medicine and Health Sciences, Ghent University, C. Heymanslaan 10, 9000 Ghent, Belgium
| | - Cláudio Pinheiro
- Laboratory
of Experimental Cancer Research, Department of Human Structure and
Repair, Ghent University, 9000 Ghent, Belgium
- Cancer
Research Institute Ghent (CRIG), 9000 Ghent, Belgium
| | - An Hendrix
- Laboratory
of Experimental Cancer Research, Department of Human Structure and
Repair, Ghent University, 9000 Ghent, Belgium
- Cancer
Research Institute Ghent (CRIG), 9000 Ghent, Belgium
| | - Max Nobis
- Intravital
Imaging Expertise Center, VIB Center for Cancer Biology, KU Leuven, 3000 Leuven, Belgium
| | - Sergey M. Borisov
- Institute
of Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 9, Graz 8010, Austria
| | - Ruslan I. Dmitriev
- Tissue
Engineering and Biomaterials Group, Department of Human Structure
and Repair, Faculty of Medicine and Health Sciences, Ghent University, C. Heymanslaan 10, 9000 Ghent, Belgium
- Ghent
Light
Microscopy Core, Ghent University, 9000 Ghent, Belgium
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2
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Müller M, Cascales JP, Marks HL, Wang-Evers M, Manstein D, Evans CL. Phosphorescent Microneedle Array for the Measurement of Oxygen Partial Pressure in Tissue. ACS Sens 2022; 7:3440-3449. [PMID: 36305608 DOI: 10.1021/acssensors.2c01775] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The knowledge of the exact oxygen partial pressure in tissue is crucial for patient care and in the treatment of ischemic medical conditions. However, current methods to assess oxygen partial pressure in tissue suffer from a variety of disadvantages, including complex equipment and procedures that necessitate trained personnel. Additionally, the barrier function of the stratum corneum reduces oxygen exchange and can consequently hamper surface measurements of rapidly changing oxygen partial pressure in tissue. To overcome these challenges, a novel, easy-to-use technique to monitor the oxygen partial pressure in tissue using microneedle arrays (MNAs) has been developed. The MNAs can be made from poly(ethyl methacrylate) and poly(propyl methacrylate) and overcome the skin's barrier function to measure oxygen in the capillary bed and interstitial fluid of the skin. The MNAs' tips are embedded with an oxygen-sensitive phosphorescent metalloporphyrin, where the oxygen partial pressure inversely correlates to changes in both emission intensity and phosphorescence lifetime of the in-house developed red emitting Pt-core porphyrin. It was demonstrated that the oxygen-sensing MNAs are sufficiently robust to puncture human skin via rupture of the stratum corneum, and that the MNAs can detect changes in oxygen partial pressure in skin within the physiologically relevant range (0-160 mmHg). Additionally, the MNAs can be combined with a wearable wireless optical readout system, making these oxygen-sensing MNAs a novel wearable and portable method for user-friendly monitoring of oxygen partial pressure in skin.
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Affiliation(s)
- Matthias Müller
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Juan Pedro Cascales
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Haley L Marks
- Cutaneous Biology Research Center, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Michael Wang-Evers
- Cutaneous Biology Research Center, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Dieter Manstein
- Cutaneous Biology Research Center, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
| | - Conor L Evans
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts02129, United States
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3
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Severin Hansen D, Jespersen S, Bram MV, Yang Z. Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water. SENSORS 2020; 20:s20164435. [PMID: 32784448 PMCID: PMC7472087 DOI: 10.3390/s20164435] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 08/04/2020] [Accepted: 08/06/2020] [Indexed: 11/23/2022]
Abstract
Offshore oil and gas facilities are currently measuring the oil-in-water (OiW) concentration in the produced water manually before discharging it into the ocean, which in most cases fulfills the government regulations. However, as stricter regulations and environmental concerns are increasing over time, the importance of measuring OiW in real-time intensifies. The significant amount of uncertainties associated with manual samplings, that is currently not taken into consideration, could potentially affect the acceptance of OiW monitors and lower the reputation of all online OiW measurement techniques. This work presents the performance of four fluorescence-based monitors on an in-house testing facility. Previous studies of a fluorescence-based monitor have raised concerns about the measurement of OiW concentration being flow-dependent. The proposed results show that the measurements from the fluorescence-based monitors are not or insignificantly flow-dependent. However, other parameters, such as gas bubbles and droplet sizes, do affect the measurement. Testing the monitors’ calibration method revealed that the weighted least square is preferred to achieve high reproducibility. Due to the high sensitivity to different compositions of atomic structures, other than aromatic hydrocarbons, the fluorescence-based monitor might not be feasible for measuring OiW concentrations in dynamic separation facilities with consistent changes. Nevertheless, they are still of interest for measuring the separation efficiency of a deoiling hydrocyclone to enhance its deoiling performance, as the separation efficiency is not dependent on OiW trueness but rather the OiW concentration before and after the hydrocyclone.
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4
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Ashokkumar P, Adarsh N, Klymchenko AS. Ratiometric Nanoparticle Probe Based on FRET-Amplified Phosphorescence for Oxygen Sensing with Minimal Phototoxicity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2002494. [PMID: 32583632 DOI: 10.1002/smll.202002494] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Indexed: 06/11/2023]
Abstract
Luminescent oxygen probes enable direct imaging of hypoxic conditions in cells and tissues, which are associated with a variety of diseases, including cancer. Here, a nanoparticle probe that addresses key challenges in the field is developed, it: i) strongly amplifies room temperature phosphorescence of encapsulated oxygen-sensitive dyes; ii) provides ratiometric response to oxygen; and iii) solves the fundamental problem of phototoxicity of phosphorescent sensors. The nanoprobe is based on 40 nm polymeric nanoparticles, encapsulating ≈2000 blue-emitting cyanine dyes with fluorinated tetraphenylborate counterions, which are as bright as 70 quantum dots (QD525). It functions as a light-harvesting nanoantenna that undergoes efficient Förster resonance energy transfer to ≈20 phosphorescent oxygen-sensitive platinum octaethylporphyrin (PtOEP) acceptor dyes. The obtained nanoprobe emits stable blue fluorescence and oxygen-sensitive red phosphorescence, providing ratiometric response to dissolved oxygen. The light harvesting leads to ≈60-fold phosphorescence amplification and makes the single nanoprobe particle as bright as ≈1200 PtOEP dyes. This high brightness enables oxygen detection at a single-particle level and in cells at ultra-low nanoprobe concentration with no sign of phototoxicity, in contrast to PtOEP dye. The developed nanoprobe is successfully applied to the imaging of a microfluidics-generated oxygen gradient in cancer cells. It constitutes a promising tool for bioimaging of hypoxia.
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Affiliation(s)
- Pichandi Ashokkumar
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Faculté de Pharmacie, Université de Strasbourg, Strasbourg, CS, 60024, France
- Department of Bioelectronics and Biosensors, Alagappa University, Karaikudi, 630003, India
| | - Nagappanpillai Adarsh
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Faculté de Pharmacie, Université de Strasbourg, Strasbourg, CS, 60024, France
| | - Andrey S Klymchenko
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Faculté de Pharmacie, Université de Strasbourg, Strasbourg, CS, 60024, France
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Katayama Y, Fujioka Y, Tsukada K. Development of a Patch-Type Flexible Oxygen Partial Pressure Sensor. IEEE JOURNAL OF TRANSLATIONAL ENGINEERING IN HEALTH AND MEDICINE-JTEHM 2020; 8:1400607. [PMID: 32637263 PMCID: PMC7333882 DOI: 10.1109/jtehm.2020.3005477] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 05/23/2020] [Accepted: 06/23/2020] [Indexed: 11/24/2022]
Abstract
Oxygen concentration in living organisms is one of the important vital indicators in emergency care and bedside medical settings. However, the oximetry method has limitations: the measurement site is limited to the tissue containing blood and the absolute value of oxygen concentration cannot be measured. To overcome these limitations, in this work, we develop a new oxygen sensor that can directly measure the oxygen particle pressure (\documentclass[12pt]{minimal}
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}{}$p\text{O}_{2}$
\end{document}) on the surface of the body and organs. A light emitting diode (LED) and a photodiode (PD) were embedded in a dimethylpolysiloxane substrate mixed with carbon nanotubes. The effectiveness of the device was evaluated using calibration, bending strain tests, time and frequency response, and finally in vivo assessments. The results reveal that the calibration experiment of the fabricated oxygen sensor device showed high sensitivity. The carbon nanotube electrode has a sufficient bending resistance and does not affect the response characteristics of the LED and PD, that is, it does not affect the oxygen measurement. In vivo assessment shows that the developed patch-type flexible oxygen sensor can accurately measure \documentclass[12pt]{minimal}
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}{}$p\text{O}_{2}$
\end{document} by attaching it to tissues or organs having irregularities or curved surfaces and actual measurements on rat liver surface demonstrated its feasibility.
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Affiliation(s)
- Yuta Katayama
- Graduate School of Fundamental Science and TechnologyKeio UniversityYokohama223-8522Japan
| | - Yuta Fujioka
- Graduate School of Fundamental Science and TechnologyKeio UniversityYokohama223-8522Japan
| | - Kosuke Tsukada
- Graduate School of Fundamental Science and TechnologyKeio UniversityYokohama223-8522Japan.,Department of Applied Physics and Physico-InformaticsKeio UniversityYokohama223-8522Japan
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6
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Imaging of hypoxia, oxygen consumption and recovery in vivo during ALA-photodynamic therapy using delayed fluorescence of Protoporphyrin IX. Photodiagnosis Photodyn Ther 2020; 30:101790. [DOI: 10.1016/j.pdpdt.2020.101790] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 04/19/2020] [Accepted: 04/20/2020] [Indexed: 01/17/2023]
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7
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Kuster N, Bargnoux AS, Badiou S, Dupuy AM, Piéroni L, Cristol JP. Multilevel qualification of a large set of blood gas analyzers: Which performance goals? Clin Biochem 2019; 74:47-53. [PMID: 31533025 DOI: 10.1016/j.clinbiochem.2019.09.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/13/2019] [Accepted: 09/13/2019] [Indexed: 10/26/2022]
Abstract
BACKGROUND Blood gas analyzers are frequently installed as point of care devices and thus allow rapid decision making. Few data are available regarding analytical performance of large sets of BGA. We aimed at evaluating 22 ABL 90 Flex Plus analyzers intended to be deployed. The evaluation was performed at the device level and at the entire set level to characterize the quality of measurements but also to ensure consistency across the devices deployed in the hospital. METHODS Imprecision and total error were assessed for pH, pCO2, pO2, sodium, potassium, ionized calcium, glucose, lactate and oximetry parameters. Imprecision at the hospital level including between device variability was also evaluated. One of the two analyzers used in the central laboratory was correlated with a GEM Premier 4000 and a Cobas b221 analyzers. Thereafter, we tested sequentially the 20 instruments intended to be deployed in care service in comparison with the reference device. RESULTS Heterogeneity of analytical performance across the different analyzers was low, allowing to consider the whole set as a unique analyzer. The total error was in line with performance goals. Analytical performance of the analyzers was found suitable for use in clinical practice. CONCLUSIONS Our study is an example of the qualification of a set of point and underscores 1)The need for a unified qualification scheme when multiple analyzers are deployed simultaneously 2) analytical performance goals compatible with clinical use and the state of the art for all parameters.
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Affiliation(s)
- Nils Kuster
- Department of Biochemistry and Hormonology, CHU de Montpellier, France; PhyMedExp, University of Montpellier, INSERM, CNRS, France
| | - Anne Sophie Bargnoux
- Department of Biochemistry and Hormonology, CHU de Montpellier, France; PhyMedExp, University of Montpellier, INSERM, CNRS, France
| | - Stéphanie Badiou
- Department of Biochemistry and Hormonology, CHU de Montpellier, France; PhyMedExp, University of Montpellier, INSERM, CNRS, France
| | - Anne-Marie Dupuy
- Department of Biochemistry and Hormonology, CHU de Montpellier, France
| | - Laurence Piéroni
- Department of Biochemistry and Hormonology, CHU de Montpellier, France
| | - Jean Paul Cristol
- Department of Biochemistry and Hormonology, CHU de Montpellier, France; PhyMedExp, University of Montpellier, INSERM, CNRS, France.
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8
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Zheng X, Cui L, Chen M, Soto LA, Graves EE, Rao J. A Near-Infrared Phosphorescent Nanoprobe Enables Quantitative, Longitudinal Imaging of Tumor Hypoxia Dynamics during Radiotherapy. Cancer Res 2019; 79:4787-4797. [PMID: 31311808 DOI: 10.1158/0008-5472.can-19-0530] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 05/21/2019] [Accepted: 07/11/2019] [Indexed: 12/17/2022]
Abstract
Hypoxia plays a key role in tumor resistance to radiotherapy. It is important to study hypoxia dynamics during radiotherapy to improve treatment planning and prognosis. Here, we describe a luminescent nanoprobe, composed of a fluorescent semiconducting polymer and palladium complex, for quantitative longitudinal imaging of tumor hypoxia dynamics during radiotherapy. The nanoprobe was designed to provide high sensitivity and reversible response for the subtle change in hypoxia over a narrow range (0-30 mmHg O2), which spans the oxygen range where tumors have limited radiosensitivity. Following intravenous administration, the nanoprobe efficiently accumulated in and distributed across the tumor, including the hypoxic region. The ratio between emissions at 700 and 800 nm provided quantitative mapping of hypoxia across the entire tumor. The nanoprobe was used to image tumor hypoxia dynamics over 7 days during fractionated radiotherapy and revealed that high fractional dose (10 Gy) was more effective in improving tumor reoxygenation than low dose (2 Gy), and the effect tended to persist longer in smaller or more radiosensitive tumors. Our results also indicated the importance of the reoxygenation efficiency of the first fraction in the prediction of the radiation treatment outcome. In summary, this work has established a new nanoprobe for highly sensitive, quantitative, and longitudinal imaging of tumor hypoxia dynamics following radiotherapy, and demonstrated its value for assessing the efficacy of radiotherapy and radiation treatment planning. SIGNIFICANCE: This study presents a novel nanoagent for the visualization and quantification of tumor hypoxia.
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Affiliation(s)
- Xianchuang Zheng
- Department of Radiology, Molecular Imaging Program at Stanford, School of Medicine, Stanford University, Stanford, California
| | - Liyang Cui
- Department of Radiology, Molecular Imaging Program at Stanford, School of Medicine, Stanford University, Stanford, California
| | - Min Chen
- Department of Radiology, Molecular Imaging Program at Stanford, School of Medicine, Stanford University, Stanford, California
| | - Luis A Soto
- Department of Radiation Oncology, Molecular Imaging Program at Stanford, School of Medicine, Stanford University, Stanford, California
| | - Edward E Graves
- Department of Radiation Oncology, Molecular Imaging Program at Stanford, School of Medicine, Stanford University, Stanford, California
| | - Jianghong Rao
- Department of Radiology, Molecular Imaging Program at Stanford, School of Medicine, Stanford University, Stanford, California.
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9
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Wengler K, Wang J, Serrano Sosa M, Gumus S, He A, Hussain S, Huang C, Tae Bae K, He X. Mapping hepatic blood oxygenation by quantitative BOLD (qBOLD) MRI. Magn Reson Med 2019; 81:3272-3282. [PMID: 30652357 DOI: 10.1002/mrm.27642] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 11/21/2018] [Accepted: 12/02/2018] [Indexed: 12/11/2022]
Abstract
PURPOSE Abnormalities in hepatic oxygen delivery and oxygen consumption may serve as a significant indicator of hepatic cellular dysfunction and may predict treatment response. However, conventional and oxygen-enhanced hepatic BOLD MRI can only provide semiquantitative assessment of hepatic oxygenation. METHODS A hepatic quantitative BOLD (qBOLD) model was proposed for noninvasive mapping of hepatic venous blood oxygen saturation (Yv ) and deoxygenated blood volume (DBV) in human subjects. The validity and the estimation bias of the proposed model were evaluated by Monte Carlo simulations. Eight healthy subjects were scanned after written consent with institutional review board approval. RESULTS Monte Carlo simulations demonstrated that the proposed single-compartment hepatic qBOLD model leads to significant deviation of the predicted T2 * decay profile from the simulated signal due to high hepatic blood volume fraction. Small relative estimation bias for hepatic Yv and significant overestimation for hepatic DBV were observed, which can be corrected by applying the calibration curves established from simulations. After correction, the mean hepatic Yv in human subjects was 56.8 ± 6.8%, and the mean hepatic DBV was 0.190 ± 0.035, consistent with measurements from other invasive approaches. Except in regions with significant vascular contamination, the maps for hepatic Yv and DBV were relatively homogenous. CONCLUSIONS With estimation bias correction, the hepatic qBOLD approach enables noninvasive mapping of hepatic blood volume and oxygenation in human subjects. The established protocol may be used to quantitatively assess hepatic tissue hypoxia in multiple liver diseases.
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Affiliation(s)
- Kenneth Wengler
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, New York, New York
| | - Jinhong Wang
- Department of Medical Imaging, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, PR China
| | - Mario Serrano Sosa
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, New York, New York
| | - Serter Gumus
- Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Andrea He
- College of Letters and Science, University of Berkeley, Berkeley, California
| | - Shahid Hussain
- Department of Radiology, Stony Brook University, Stony Brook, New York, New York
| | - Chuan Huang
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, New York, New York.,Department of Radiology, Stony Brook University, Stony Brook, New York, New York.,Department of Psychiatry, Stony Brook University, Stony Brook, New York, New York
| | - Kyong Tae Bae
- Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Xiang He
- Department of Radiology, Stony Brook University, Stony Brook, New York, New York
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10
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Zheng Z, Ayhan MM, Liao YY, Calin N, Bucher C, Andraud C, Bretonnière Y. Design of two-photon absorbing fluorophores for FRET antenna-core oxygen probes. NEW J CHEM 2018. [DOI: 10.1039/c7nj05073a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Four two-photon absorbing fluorophores A1–A4 are reported and their spectroscopic properties are analyzed for use, in combination with palladium–porphyrinato complexes C1 and C2, as two-photon absorbing antennas and energy donors for FRET-based antenna-core oxygen sensitive phosphorescent probes.
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Affiliation(s)
- Zheng Zheng
- Univ Lyon
- ENS de Lyon
- CNRS UMR 5182
- UCB Lyon I
- Laboratoire de Chimie
| | | | - Yuan-Yuan Liao
- Univ Lyon
- ENS de Lyon
- CNRS UMR 5182
- UCB Lyon I
- Laboratoire de Chimie
| | - Nathalie Calin
- Univ Lyon
- ENS de Lyon
- CNRS UMR 5182
- UCB Lyon I
- Laboratoire de Chimie
| | | | - Chantal Andraud
- Univ Lyon
- ENS de Lyon
- CNRS UMR 5182
- UCB Lyon I
- Laboratoire de Chimie
| | - Yann Bretonnière
- Univ Lyon
- ENS de Lyon
- CNRS UMR 5182
- UCB Lyon I
- Laboratoire de Chimie
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11
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Ru Y, Zhang X, Song W, Liu Z, Feng H, Wang B, Guo M, Wang X, Luo C, Yang W, Li Y, Qiao J. A new family of thermoplastic photoluminescence polymers. Polym Chem 2016. [DOI: 10.1039/c6py00915h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In order to overcome the drawback of traditional photoluminescence materials, which are usually opaque, expensive and non-thermoplastic, a new family of photoluminescence alternate copolymers made from maleic anhydride and different olefin derivatives with very low cost have been developed and are reported in this paper.
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Affiliation(s)
- Yue Ru
- College of Materials Science and Engineering
- Beijing University of Chemical and Technology
- Beijing 100029
- China
- SINOPEC Beijing Research Institute of Chemical Industry
| | - Xiaohong Zhang
- SINOPEC Beijing Research Institute of Chemical Industry
- Beijing 100013
- China
| | - Wenbo Song
- SINOPEC Beijing Research Institute of Chemical Industry
- Beijing 100013
- China
| | - Zhenjie Liu
- SINOPEC Beijing Research Institute of Chemical Industry
- Beijing 100013
- China
| | - Huasheng Feng
- SINOPEC Beijing Research Institute of Chemical Industry
- Beijing 100013
- China
| | - Bin Wang
- SINOPEC Beijing Research Institute of Chemical Industry
- Beijing 100013
- China
| | - Mingming Guo
- SINOPEC Beijing Research Institute of Chemical Industry
- Beijing 100013
- China
| | - Xiang Wang
- SINOPEC Beijing Research Institute of Chemical Industry
- Beijing 100013
- China
| | - Chunxia Luo
- SINOPEC Beijing Research Institute of Chemical Industry
- Beijing 100013
- China
| | - Wantai Yang
- College of Materials Science and Engineering
- Beijing University of Chemical and Technology
- Beijing 100029
- China
| | - Yongfang Li
- Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institution of Chemistry Chinese Academy of Sciences
- Beijing 100190
- China
| | - Jinliang Qiao
- College of Materials Science and Engineering
- Beijing University of Chemical and Technology
- Beijing 100029
- China
- SINOPEC Beijing Research Institute of Chemical Industry
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12
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Belzile MN, Wang X, Hudson ZM, Wang S. Impact of constitutional isomerism on phosphorescence and anion-sensing properties of donor–acceptor organoboron Pt(ii) complexes. Dalton Trans 2014; 43:13696-703. [DOI: 10.1039/c4dt01949k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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13
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Zhang Z, Guo QN, Lu YG, Jia T, Yan K, Li ZY. Interaction between novel porphyrin-dextran nanoparticles and human serum albumin. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424610001969] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A novel porphyrin-dextran coated Fe3O4 nanoparticle (5) was designed and synthesized. The structure of 5 was confirmed by IR, UV-vis and inductively coupled plasma atomic emission spectrometry, and dynamic laser scattering (DLS); magnetic property was measured by a vibrating sample magnetometer (VSM). The interaction between compound 5 and human serum albumin (HSA) was investigated through UV-vis absorbance spectra and fluorospectrophotometer, compared with the 5-(4-aminophenyl)-10,15,20-tris-(4-sulfonatophenyl)porphyrin, trisodium salt (3). The results showed compound 5 containing porphyrin moiety and 3 could interact with HSA. The quenching constant (Ksv) was 4.739 × 105 M-1 for 3, and 2.846 × 105 M-1 for 5; the apparent affinity binding constant (KA) was 8.562 × 103 M-1 for 3, and 4.978 × 104 M-1 for 5.
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Affiliation(s)
- Zhi Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China
| | - Qian-ni Guo
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China
| | - Yun-guo Lu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China
| | - Tao Jia
- College of Pharmacy, Wuhan University, Wuhan 430072, P.R. China
| | - Kun Yan
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China
| | - Zao-ying Li
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China
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Aortic cross-clamping and reperfusion in pigs reduces microvascular oxygenation by altered systemic and regional blood flow distribution. Anesth Analg 2010; 111:345-53. [PMID: 20584875 DOI: 10.1213/ane.0b013e3181e4255f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND In this study, we tested the hypothesis that aortic cross-clamping (ACC) and reperfusion cause distributive alterations of oxygenation and perfusion in the microcirculation of the gut and kidneys despite normal systemic hemodynamics and oxygenation. METHODS Fifteen anesthetized pigs were randomized between an ACC group (n = 10), undergoing 45 minutes of aortic clamping above the superior mesenteric artery, and a time-matched sham surgery control group (n = 5). Systemic, intestinal, and renal hemodynamics and oxygenation variables were monitored during 4 hours of reperfusion. Microvascular oxygen partial pressure (microPo(2)) was measured in the intestinal serosa and mucosa and the renal cortex, using the Pd-porphyrin phosphorescence technique. Intestinal luminal Pco(2) was determined by air tonometry and the serosal microvascular flow by orthogonal polarization spectral imaging. RESULTS Organ blood flow and renal and intestinal microPo(2) decreased significantly during ACC, whereas the intestinal oxygen extraction and Pco(2) gap increased. The intestinal response to reperfusion after ACC was a sustained reactive hyperemia but no such effect was seen in the kidney. Despite a sustained high intestinal O(2) delivery, serosal microPo(2) (median [range], 49 mm Hg [41-67 mm Hg] versus 37 mm Hg [27-41 mm Hg]; P < 0.05 baseline versus 4 hours reperfusion) and the absolute number of perfused microvessels decreased along with an increased intestinal Pco(2) gap (17 mm Hg [10-19 mm Hg] versus 23 mm Hg [19-30 mm Hg]; P < 0.05). In contrast, the kidney showed a progressive O(2) delivery decrease accompanied by a decrease in renal cortex oxygenation (70 mm Hg [52-93 mm Hg] versus 57 mm Hg [33-64 mm Hg]; P < 0.05). CONCLUSION Increased systemic and regional blood flow and oxygen supply after ACC does not ensure adequate regional blood flow and microcirculatory oxygenation in all organs.
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Vázquez BYS, Hightower CM, Sapuppo F, Tartakovsky DM, Intaglietta M. Functional optical imaging at the microscopic level. JOURNAL OF BIOMEDICAL OPTICS 2010; 15:011102. [PMID: 20210428 PMCID: PMC2816989 DOI: 10.1117/1.3280270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 07/07/2009] [Accepted: 07/09/2009] [Indexed: 05/28/2023]
Abstract
Functional microscopic imaging of in vivo tissues aims at characterizing parameters at the level of the unitary cellular components under normal conditions, in the presence of blood flow, to understand and monitor phenomena that lead to maintaining homeostatic balance. Of principal interest are the setting of shear stress on the endothelium; formation of the plasma layer, where the balance between nitric oxide production and scavenging is established; and formation of the oxygen gradients that determine the distribution of oxygen from blood into the tissue. Optical techniques that enable the analysis of functional microvascular processes are the measurement of blood vessel dimensions by image shearing, the photometric analysis of the extent of the plasma layer, the dual-slit methodology for measuring blood flow velocity, and the direct measurement of oxygen concentration in blood and tissue. Each of these technologies includes the development of paired, related mathematical approaches that enable characterizing the transport properties of the blood tissue system. While the technology has been successful in analyzing the living tissue in experimental conditions, deployment to clinical settings remains an elusive goal, due to the difficulty of obtaining optical access to the depth of the tissue.
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16
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Decroos C, Li Y, Bertho G, Frapart Y, Mansuy D, Boucher JL. Oxidative and Reductive Metabolism of Tris(p-carboxyltetrathiaaryl)methyl Radicals by Liver Microsomes. Chem Res Toxicol 2009; 22:1342-50. [DOI: 10.1021/tx9001379] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Christophe Decroos
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris Descartes, 45 rue des Saints Pères, 75270 Paris Cedex 06, France
| | - Yun Li
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris Descartes, 45 rue des Saints Pères, 75270 Paris Cedex 06, France
| | - Gildas Bertho
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris Descartes, 45 rue des Saints Pères, 75270 Paris Cedex 06, France
| | - Yves Frapart
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris Descartes, 45 rue des Saints Pères, 75270 Paris Cedex 06, France
| | - Daniel Mansuy
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris Descartes, 45 rue des Saints Pères, 75270 Paris Cedex 06, France
| | - Jean-Luc Boucher
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris Descartes, 45 rue des Saints Pères, 75270 Paris Cedex 06, France
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17
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Tao Z, Jones E, Goodisman J, Souid AK. Quantitative measure of cytotoxicity of anticancer drugs and other agents. Anal Biochem 2008; 381:43-52. [PMID: 18602881 DOI: 10.1016/j.ab.2008.06.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Revised: 06/12/2008] [Accepted: 06/13/2008] [Indexed: 02/06/2023]
Abstract
Many anticancer drugs act on cancer cells to promote apoptosis, which includes impairment of cellular respiration (mitochondrial O(2) consumption). Other agents also inhibit cellular respiration, sometimes irreversibly. To investigate the sensitivity of cancer cells to cytotoxins, including anticancer drugs, we compare the profiles of cellular O(2) consumption in the absence and presence of these agents. Oxygen measurements are made at 37 degrees C, using glucose as a substrate, with [O(2)] obtained from the phosphorescence decay rate of a palladium phosphor. The rate of respiration k is defined as -d[O(2)]/dt in a sealed container. Different toxins produce different profiles of impaired respiration, implying different mechanisms for the drug-induced mitochondrial dysfunction. The decrease in the average value of k over a fixed time period, I, is proposed as a characteristic value to assess mitochondrial injury. The value of I depends on the nature of the toxin, its concentration, and the exposure time as well as on the cell type. Results for several cell types and 10 cytotoxins are presented here.
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Affiliation(s)
- Zhimin Tao
- Department of Pediatrics, State University of New York, Upstate Medical University, Syracuse, NY 13210, USA
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18
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Tao Z, Goodisman J, Souid AK. Oxygen Measurement via Phosphorescence: Reaction of Sodium Dithionite with Dissolved Oxygen. J Phys Chem A 2008; 112:1511-8. [DOI: 10.1021/jp710176z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhimin Tao
- Department of Pediatrics, State University of New York, Upstate Medical University, 750 East Adams Street, Syracuse, New York 13210 and Department of Chemistry, Syracuse University, CST, 1-014, Syracuse, New York 13244
| | - Jerry Goodisman
- Department of Pediatrics, State University of New York, Upstate Medical University, 750 East Adams Street, Syracuse, New York 13210 and Department of Chemistry, Syracuse University, CST, 1-014, Syracuse, New York 13244
| | - Abdul-Kader Souid
- Department of Pediatrics, State University of New York, Upstate Medical University, 750 East Adams Street, Syracuse, New York 13210 and Department of Chemistry, Syracuse University, CST, 1-014, Syracuse, New York 13244
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19
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Abstract
The relationships between neural and metabolic processes in activated brain regions are central to the interpretation of noninvasive imaging. To examine this relationship, we have used a specialized sensor to measure simultaneously tissue oxygen changes and neural activity in colocalized regions of the cat's lateral geniculate nucleus (LGN). Previous work with this sensor has shown that a decrease or increase in tissue oxygen can be elicited by selective control of the location and extent of neural activation in the LGN. In the current study, to evaluate the temporal integration and homogeneity of neurometabolic coupling, we have determined the relationship between multiunit extracellular neural activity and tissue oxygen responses to visual stimuli of various durations and contrasts. Our results show that the negative but not the positive oxygen response changes in an approximately linear manner with stimulus duration. The relationship between the negative oxygen response and neural activity is relatively constant with stimulus duration. Moreover, both negative and positive oxygen responses saturate at high stimulus contrast levels. Coupling between neural activity and negative oxygen responses is well described by a power law function. These results help elucidate differences between the initial negative and subsequent positive metabolic responses and may be directly relevant to questions concerning brain mapping with functional magnetic resonance imaging.
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Affiliation(s)
- Baowang Li
- Vision Science Group, School of Optometry, and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, California 94720-2020
| | - Ralph D. Freeman
- Vision Science Group, School of Optometry, and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, California 94720-2020
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20
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Woodhams JH, Macrobert AJ, Bown SG. The role of oxygen monitoring during photodynamic therapy and its potential for treatment dosimetry. Photochem Photobiol Sci 2007; 6:1246-56. [PMID: 18046479 DOI: 10.1039/b709644e] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding of the biology of photodynamic therapy (PDT) has expanded tremendously over the past few years. However, in the clinical situation, it is still a challenge to match the extent of PDT effects to the extent of the disease process being treated. PDT requires drug, light and oxygen, any of which can be the limiting factor in determining efficacy at each point in a target organ. This article reviews techniques available for monitoring tissue oxygenation during PDT. Point measurements can be made using oxygen electrodes or luminescence-based optodes for direct measurements of tissue pO2, or using optical spectroscopy for measuring the oxygen saturation of haemoglobin. Imaging is considerably more complex, but may become feasible with techniques like BOLD MRI. Pre-clinical studies have shown dramatic changes in oxygenation during PDT, which vary with the photosensitizer used and the light delivery regimen. Better oxygenation throughout treatment is achieved if the light fluence rate is kept low as this reduces the rate of oxygen consumption. The relationship between tissue oxygenation and PDT effect is complex and remarkably few studies have directly correlated oxygenation changes during PDT with the final biological effect, although those that have confirm the value of maintaining good oxygenation. Real time monitoring to ensure adequate oxygenation at strategic points in target tissues during PDT is likely to be important, particularly in the image guided treatment of tumours of solid organs.
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Affiliation(s)
- Josephine H Woodhams
- National Medical Laser Centre, Royal Free and University College Medical School, University College London, Charles Bell House, 67-73 Riding House Street, London, UKW1W 7EJ
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21
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Strovas TJ, Dragavon JM, Hankins TJ, Callis JB, Burgess LW, Lidstrom ME. Measurement of respiration rates of Methylobacterium extorquens AM1 cultures by use of a phosphorescence-based sensor. Appl Environ Microbiol 2006; 72:1692-5. [PMID: 16461730 PMCID: PMC1392911 DOI: 10.1128/aem.72.2.1692-1695.2006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Respiration rates of bacterial cultures can be a powerful tool in gauging the effects of genetic manipulation and environmental changes affecting overall metabolism. We present an optical method for measuring respiration rates using a robust phosphorescence lifetime-based sensor and off-the-shelf technology. This method was tested with the facultative methylotroph Methylobacterium extorquens AM1 to demonstrate subtle mutant phenotypes.
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Affiliation(s)
- Tim J Strovas
- Department of Bioengineering, Microscale Life Sciences Center, University of Washington, Seattle, Washington 98195-2180, USA
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22
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Menon C, Fraker DL. Tumor oxygenation status as a prognostic marker. Cancer Lett 2005; 221:225-35. [PMID: 15808408 DOI: 10.1016/j.canlet.2004.06.029] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2004] [Accepted: 06/20/2004] [Indexed: 11/16/2022]
Abstract
Tumor oxygenation status is an independent prognostic indicator in cancer because it influences tumor progression and treatment outcome. Its quantitative value is determined by a number of tumor vascular parameters such as microvascular density, blood flow, blood volume, blood oxygen saturation, tumor tissue pO2, and resistance to oxygen diffusion within the tumor. Over the past several years, considerable time and effort have been invested into developing techniques to effectively and reliably measure the oxygenation status of a tumor. The measurement and interpretation of data obtained with currently available methods is complicated by the heterogeneity in tumor oxygenation. Currently available techniques can be broadly classified into direct invasive methods, direct non-invasive methods, and measurement of surrogate endogenous markers of tumor oxygenation. Of these methods, the Eppendorf pO2 histograph is considered the 'gold standard' and even so has several limitations. Given the importance of tumor oxygenation status in therapy and in predicting disease progression, it is imperative that reliable, globally usable, and technically simplistic methods be developed to yield a consistent, comprehensive, and reliable profile of tumor oxygenation. Until newer more reliable techniques are developed, existing independent techniques or appropriate combinations of techniques should be optimized and validated using known endpoints in tumor oxygenation status and/or treatment outcomes.
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Affiliation(s)
- Chandrakala Menon
- Division of Surgical Oncology, Department of Surgery, University of Pennsylvania, 4th Floor Silverstein Building, 3400 Spruce Street, Philadelphia, PA, USA
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23
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Ances BM. Coupling of changes in cerebral blood flow with neural activity: what must initially dip must come back up. J Cereb Blood Flow Metab 2004; 24:1-6. [PMID: 14688611 DOI: 10.1097/01.wcb.0000103920.96801.12] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Activation flow coupling, increases in neuronal activity leading to changes in cerebral blood flow (CBF), is the basis of many neuroimaging methods. An early rise in deoxygenation, the "initial dip," occurs before changes in CBF and cerebral blood volume (CBV) and may provide a better spatial localizer of early neuronal activity compared with subsequent increases in CBF. Imaging modality, anesthetic, degree of oxygenation, and species can influence the magnitude of this initial dip. The observed initial dip may reflect a depletion of mitochondrial oxygen (O(2)) buffers caused by increased neuronal activity. Changes in CBF mediated by nitric oxide (NO) or other metabolites and not caused by a lack of O(2) or energy depletion most likely lead to an increased delivery of capillary O(2) in an attempt to maintain intracellular O(2) buffers.
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Affiliation(s)
- Beau M Ances
- Department of Neurology, Hospital of the University of Pennsylvania, Philadelphia, PA 19104, USA.
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24
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Song Y, Constantinescu A, Mason RP. Dynamic breast tumor oximetry: the development of prognostic radiology. Technol Cancer Res Treat 2002; 1:471-8. [PMID: 12625774 DOI: 10.1177/153303460200100607] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A novel pre clinical approach to evaluating tumor oxygen dynamics was recently introduced (Am. J. Clin. Oncol. 24, 462-466 (2001)). FREDOM (Fluorocarbon Relaxometry using Echo planar imaging for Dynamic Oxygen Mapping) allows maps of tumor pO(2) including 50 - 150 individual locations simultaneously to be produced with typical in plane resolution of 1.25 mm in 6.5 mins. The technique has been applied extensively in rat prostate tumors and is now demonstrated in the rat breast 13762NF adenocarcinoma. When anesthetized rats breathed 33% oxygen, mean baseline pO(2) was in the range 17 +/- 2 (se) torr to 74 +/- 4 torr with mean value for nine tumors 46 +/- 8 torr. However, small tumors (< 2.2 cm(3)) were significantly better oxygenated with mean pO(2) = 63 +/- 7 torr than large tumors (> 2.4 cm(3)) with mean pO(2) 24 +/- 5 torr (p < 0.002). Switching the inhaled gas to oxygen or carbogen produced a significant and rapid increase in mean pO(2) for both small and larger tumors (p < 0.05). Given the increasing evidence that tumor oxygenation is related to therapeutic outcome, we believe this approach to measuring tumor oxygen dynamics can be of value in predicting response to therapy, evaluating adjuvant interventions designed to modulate response to therapy, and in providing "Prognostic Radiology".
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Affiliation(s)
- Yulin Song
- Cancer Imaging Program, Department of Radiology, University of Texas, Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA
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25
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Köhling R, Greiner C, Wölfer J, Wassmann H, Speckmann EJ. Optical monitoring of PO2 changes and simultaneous recording of bioelectric activity in human and animal brain slices. J Neurosci Methods 1998; 85:181-6. [PMID: 9874154 DOI: 10.1016/s0165-0270(98)00138-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For investigations of hypoxic effects in nervous tissue, brain slices are often used as a model system. This provides the advantage that parameters of the micromilieu, e.g. pH and temperature can easily be controlled and measurements of different data, e.g. bioelectric potentials, ion activities etc. can be performed. It is of special importance that the PO2 the slice preparation is exposed to is equally controlled under these conditions. Therefore, a PO2 monitoring system is needed which provides representative values for the tissue environment. This requirement is fulfilled by an optical PO2 sensing method based on phosphorescence quenching as a function of PO2. Here, the application of this method as adapted for use in in vitro models is described and compared to the polarographic oxygen-sensing method. Both the optical and polarographic methods are comparable regarding accuracy and response time of measurements. Furthermore, both the optical method and electrophysiological measurements can be combined. Lastly, under experimental conditions, neither the phosphorescent dye Palladium-meso-tetra-4-carboxyphenyl-porphine nor the illumination necessary for excitation of the dye influence bioelectric activity of neuronal tissue in vitro. In conclusion, the optical PO2 sensing method presented here provides a tool for reliable and continuous monitoring of PO2 in the immediate environment of brain slice preparations.
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Affiliation(s)
- R Köhling
- Institut für Physiologie, Westfälische Wilhelms-Universität, Münster, Germany.
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26
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Wilson DF, Vinogradov S, Lo LW, Huang L. Oxygen dependent quenching of phosphorescence: a status report. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1996; 388:101-7. [PMID: 8798800 DOI: 10.1007/978-1-4613-0333-6_12] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- D F Wilson
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia 19104, USA
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27
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König K, Kimel S, Berns MW. Photodynamic effects on human and chicken erythrocytes studied with microirradiation and confocal laser scanning microscopy. Lasers Surg Med Suppl 1996; 19:284-98. [PMID: 8923424 DOI: 10.1002/(sici)1096-9101(1996)19:3<284::aid-lsm4>3.0.co;2-o] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND AND OBJECTIVE Photodynamic therapy (PDT) of cancers is associated with the destruction of the microvasculature supplying the tumor. The study elucidates the role of red blood cells in PDT-induced vascular injury. STUDY DESIGN/MATERIALS AND METHODS Intracellular accumulation of several photosensitizers in human (non-nucleated) and chicken (nucleated) erythrocytes, as well as photodynamic induced hemolysis were studied using 488 nm laser microirradiation (15 microW) and confocal laser scanning fluorescence microscopy. RESULTS Cells incubated with anionic hydrophilic compounds TPPS4 and Pd-TPPS4 exhibited no fluorescence before irradiation, but developed strong and sustained fluorescence in the cellular and nuclear membranes following photoinduced membrane damage. In contrast, microirradiation of Photofrin-incubated erythrocytes showed instantaneous fluorescence which decreased due to photodegradation. For the cationic hydrophilic dye methylene blue, significant fluorescence was detected only in the nucleus. Following ALA incubation, large intercellular differences were observed in fluorescence in the red spectral region. Photofrin induced the most efficient hemolysis. Higher radiant exposures were required for lysis of nucleated rather than of non-nucleated red blood cells, except in the case of methylene blue. CONCLUSION Laser microbeams were used, for the first time, to study photodynamic cell damage. Erythrocytes were shown to be primary targets in PDT. Damage to red blood cells could be responsible for hemostasis in the vascular bed of a tumor, which was reported by many groups.
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Affiliation(s)
- K König
- Beckman Laser Institute and Medical Clinic, UCI, Irvine, California 92715, USA
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28
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Wilson DF, Vinogradov SA. Recent advances in oxygen measurements using phosphorescence quenching. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1994; 361:61-6. [PMID: 7597989 DOI: 10.1007/978-1-4615-1875-4_8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- D F Wilson
- Department of Biochemistry and Biophysics, School of Medicine, University of Pennsylvania, Philadelphia 19104, USA
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29
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Ince C, Ashruf JF, Sanderse EA, Pierik EG, Coremans JM, Bruining HA. In vivo NADH and Pd-porphyrin video fluori-/phosphorimetry. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1992; 317:267-75. [PMID: 1288133 DOI: 10.1007/978-1-4615-3428-0_29] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- C Ince
- Department of Surgery, Erasmus University Rotterdam, The Netherlands
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