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Li C, Jiang M, Chen Z, Hu Q, Liu Z, Wang J, Yin X, Wang J, Wu M. The neuroprotective effects of normobaric oxygen therapy after stroke. CNS Neurosci Ther 2024; 30:e14858. [PMID: 39009510 PMCID: PMC11250159 DOI: 10.1111/cns.14858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Revised: 06/29/2024] [Accepted: 07/03/2024] [Indexed: 07/17/2024] Open
Abstract
BACKGROUND Stroke, including ischemic and hemorrhagic stroke, is a severe and prevalent acute cerebrovascular disease. The development of hypoxia following stroke can trigger a cascade of pathological events, including mitochondrial dysfunction, energy deficiency, oxidative stress, neuroinflammation, and excitotoxicity, all of which are often associated with unfavorable prognosis. Nonetheless, a noninvasive intervention, referred to as normobaric hyperoxia (NBO), is known to have neuroprotective effects against stroke. RESULTS NBO can exert neuroprotective effects through various mechanisms, such as the rescue of hypoxic tissues, preservation of the blood-brain barrier, reduction of brain edema, alleviation of neuroinflammation, improvement of mitochondrial function, mitigation of oxidative stress, reduction of excitotoxicity, and inhibition of apoptosis. These mechanisms may help improve the prognosis of stroke patients. CONCLUSIONS This review summarizes the mechanism by which hypoxia causes brain injury and how NBO can act as a neuroprotective therapy to treat stroke. We conclude that NBO has significant potential for treating stroke and may represent a novel therapeutic strategy.
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Affiliation(s)
- Chuan Li
- Department of Medical LaboratoryAffiliated Hospital of Jiujiang UniversityJiujiangJiangxiChina
| | - Min Jiang
- Jiujiang Clinical Precision Medicine Research CenterJiujiangJiangxiChina
| | - Zhiying Chen
- Department of NeurologyAffiliated Hospital of Jiujiang UniversityJiujiangJiangxiChina
| | - Qiongqiong Hu
- Department of NeurologyZhengzhou Central Hospital, Zhengzhou UniversityZhengzhouHenanChina
| | - Ziying Liu
- Department of Medical LaboratoryAffiliated Hospital of Jiujiang UniversityJiujiangJiangxiChina
| | - Junmin Wang
- Department of Human AnatomySchool of Basic Medical Sciences, Zhengzhou UniversityZhengzhouHenanChina
| | - Xiaoping Yin
- Department of NeurologyAffiliated Hospital of Jiujiang UniversityJiujiangJiangxiChina
| | - Jian Wang
- Department of Human AnatomySchool of Basic Medical Sciences, Zhengzhou UniversityZhengzhouHenanChina
| | - Moxin Wu
- Department of Medical LaboratoryAffiliated Hospital of Jiujiang UniversityJiujiangJiangxiChina
- Jiujiang Clinical Precision Medicine Research CenterJiujiangJiangxiChina
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Anbaei P, Stevens MG, Ball AG, Bullock TNJ, Pompano RR. Spatially resolved quantification of oxygen consumption rate in ex vivo lymph node slices. Analyst 2024; 149:2609-2620. [PMID: 38535830 PMCID: PMC11056769 DOI: 10.1039/d4an00028e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/09/2024] [Indexed: 04/09/2024]
Abstract
Cellular metabolism has been closely linked to activation state in cells of the immune system, and the oxygen consumption rate (OCR) in particular serves as a valuable metric for assessing metabolic activity. Several oxygen sensing assays have been reported for cells in standard culture conditions. However, none have provided a spatially resolved, optical measurement of local oxygen consumption in intact tissue samples, making it challenging to understand regional dynamics of consumption. Therefore, here we established a system to monitor the rates of oxygen consumption in ex vivo tissue slices, using murine lymphoid tissue as a case study. By integrating an optical oxygen sensor into a sealed perfusion chamber and incorporating appropriate correction for photobleaching of the sensor and of tissue autofluorescence, we were able to visualize and quantify rates of oxygen consumption in tissue. This method revealed for the first time that the rate of oxygen consumption in naïve lymphoid tissue was higher in the T cell region compared to the B cell and cortical regions. To validate the method, we measured OCR in the T cell regions of naïve lymph node slices using the optical assay and estimated the consumption rate per cell. The predictions from the optical assay were similar to reported values and were not significantly different from those of the Seahorse metabolic assay, a gold standard method for measuring OCR in cell suspensions. Finally, we used this method to quantify the rate of onset of tissue hypoxia for lymph node slices cultured in a sealed chamber and showed that continuous perfusion was sufficient to maintain oxygenation. In summary, this work establishes a method to monitor oxygen consumption with regional resolution in intact tissue explants, suitable for future use to compare tissue culture conditions and responses to stimulation.
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Affiliation(s)
- Parastoo Anbaei
- Department of Chemistry, University of Virginia College of Arts and, Sciences, Charlottesville, Virginia 22904, USA.
| | - Marissa G Stevens
- Department of Pathology, University of Virginia, Charlottesville, Virginia 22903, USA
- Carter Immunology Center and UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22903, USA
| | - Alexander G Ball
- Department of Microbiology Cancer Biology and Immunology, University of Virginia, Charlottesville, Virginia 22903, USA
- Carter Immunology Center and UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22903, USA
| | - Timothy N J Bullock
- Department of Pathology, University of Virginia, Charlottesville, Virginia 22903, USA
- Carter Immunology Center and UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22903, USA
| | - Rebecca R Pompano
- Department of Chemistry, University of Virginia College of Arts and, Sciences, Charlottesville, Virginia 22904, USA.
- Department of Biomedical Engineering, University of Virginia School of Engineering and Applied Sciences, Charlottesville, Virginia 22904, USA
- Carter Immunology Center and UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22903, USA
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3
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Anbaei P, Stevens MG, Ball AG, Bullock TNJ, Pompano RR. Spatially resolved quantification of oxygen consumption rate in ex vivo lymph node slices. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.03.573955. [PMID: 38260315 PMCID: PMC10802365 DOI: 10.1101/2024.01.03.573955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Cellular metabolism has been closely linked to activation state in cells of the immune system, and the oxygen consumption rate (OCR) in particular serves as a valuable metric for assessing metabolic activity. Several oxygen sensing assays have been reported for cells in standard culture conditions. However, none have provided a spatially resolved, optical measurement of local oxygen consumption in intact tissue samples, making it challenging to understand regional dynamics of consumption. Therefore, here we established a system to monitor the rates of oxygen consumption in ex vivo tissue slices, using murine lymphoid tissue as a case study. By integrating an optical oxygen sensor into a sealed perfusion chamber and incorporating appropriate correction for photobleaching of the sensor and of tissue autofluorescence, we were able to visualize and quantify rates of oxygen consumption in tissue. This method revealed for the first time that the rate of oxygen consumption in naïve lymphoid tissue was higher in the T cell region compared to the B cell and cortical regions. To validate the method, we measured OCR in the T cell regions of naïve lymph node slices using the optical assay and estimated the consumption rate per cell. The predictions from the optical assay were similar to reported values and were not significantly different from those of the Seahorse metabolic assay, a gold standard method for measuring OCR in cell suspensions. Finally, we used this method to quantify the rate of onset of tissue hypoxia for lymph node slices cultured in a sealed chamber and showed that continuous perfusion was sufficient to maintain oxygenation. In summary, this work establishes a method to monitor oxygen consumption with regional resolution in intact tissue explants, suitable for future use to compare tissue culture conditions and responses to stimulation. TOC image
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Prasad PV, Li LP, Hack B, Leloudas N, Sprague SM. Quantitative Blood Oxygenation Level Dependent Magnetic Resonance Imaging for Estimating Intra-renal Oxygen Availability Demonstrates Kidneys Are Hypoxemic in Human CKD. Kidney Int Rep 2023; 8:1057-1067. [PMID: 37180507 PMCID: PMC10166744 DOI: 10.1016/j.ekir.2023.02.1092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/08/2023] [Accepted: 02/27/2023] [Indexed: 03/09/2023] Open
Abstract
Introduction Kidney blood oxygenation level dependent (BOLD) magnetic resonance imaging (MRI) has shown great promise in evaluating relative oxygen availability. This method is quite efficacious in evaluating acute responses to physiological and pharmacologic maneuvers. Its outcome parameter, R2∗ is defined as the apparent spin-spin relaxation rate measured in the presence of magnetic susceptibility differences and it is measured using gradient echo MRI. Although associations between R2∗ and renal function decline have been described, it remains uncertain to what extent R2∗ is a true reflection of tissue oxygenation. This is primarily because of not taking into account the confounding factors, especially fractional blood volume (fBV) in tissue. Methods This case-control study included 7 healthy controls and 6 patients with diabetes and chronic kidney disease (CKD). Using data before and after administration of ferumoxytol, a blood pool MRI contrast media, the fBVs in kidney cortex and medulla were measured. Results This pilot study independently measured fBV in kidney cortex (0.23 ± 0.03 vs. 0.17 ± 0.03) and medulla (0.36 ± 0.08 vs. 0.25 ± 0.03) in a small number of healthy controls (n = 7) versus CKD (n = 6). These were then combined with BOLD MRI measurements to estimate oxygen saturation of hemoglobin (StO2) (0.87 ± 0.03 vs. 0.72 ± 0.10 in cortex; 0.82 ± 0.05 vs. 0.72 ± 0.06 in medulla) and partial pressure of oxygen in blood (bloodPO2) (55.4 ± 6.5 vs. 38.4 ± 7.6 mm Hg in cortex; 48.4 ± 6.2 vs. 38.1 ± 4.5 mm Hg in medulla) in control versus CKD. The results for the first time demonstrate that cortex is normoxemic in controls and moderately hypoxemic in CKD. In the medulla, it is mildly hypoxemic in controls and moderately hypoxemic in CKD. Whereas fBV, StO2, and bloodPO2 were strongly associated with estimated glomerular filtration rate (eGFR), R2∗ was not. Conclusion Our results support the feasibility of quantitatively assessing oxygen availability using noninvasive quantitative BOLD MRI that could be translated to the clinic.
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Affiliation(s)
- Pottumarthi V. Prasad
- Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA
- Pritzker School of Medicine, University of Chicago, Chicago, Illinois, USA
| | - Lu-Ping Li
- Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA
- Pritzker School of Medicine, University of Chicago, Chicago, Illinois, USA
| | - Bradley Hack
- Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA
| | - Nondas Leloudas
- Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, USA
| | - Stuart M. Sprague
- Department of Medicine, NorthShore University HealthSystem, Evanston, Illinois, USA
- Pritzker School of Medicine, University of Chicago, Chicago, Illinois, USA
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Valable S, Toutain J, Divoux D, Chazalviel L, Corroyer-Dulmont A, Chakhoyan A, Guillouet S, Bernaudin M, Barbier EL, Touzani O. Magnetic resonance imaging of hypoxia in acute stroke compared with fluorine-18 fluoromisonidazole-positron emission tomography: A cross-validation study? NMR IN BIOMEDICINE 2023; 36:e4858. [PMID: 36285719 DOI: 10.1002/nbm.4858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 10/07/2022] [Accepted: 10/23/2022] [Indexed: 06/16/2023]
Abstract
Acute ischemic stroke results in an ischemic core surrounded by a tissue at risk, named the penumbra, which is potentially salvageable. One way to differentiate the tissues is to measure the hypoxia status. The purpose of the current study is to correlate the abnormal brain tissue volume derived from magnetic resonance-based imaging of brain oxygen saturation (St O2 -MRI) to the fluorine-18 fluoromisonidazole ([18 F]FMISO) positron emission tomography (PET) volume for hypoxia imaging validation, and to analyze the ability of St O2 -MRI to depict the different hypoxic tissue types in the acute phase of stroke. In a pertinent model of stroke in the rat, the volume of tissue with decreased St O2 -MRI signal and that with increased uptake of [18 F]FMISO were equivalent and correlated (r = 0.706; p = 0.015). The values of St O2 in the tissue at risk were significantly greater than those quantified in the core of the lesion, and were less than those for healthy tissue (52.3% ± 2.0%; 43.3% ± 1.9%, and 67.9 ± 1.4%, respectively). A threshold value for St O2 of ≈60% as the cut-off for the identification of the tissue at risk was calculated. Tissue volumes with reduced St O2 -MRI correlated with the final lesion (r = 0.964, p < 0.0001). The findings show that the St O2 -MRI approach is sensitive for the detection of hypoxia and for the prediction of the final lesion after stroke. Once validated in acute clinical settings, this approach might be used to enhance the stratification of patients for potential therapeutic interventions.
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Affiliation(s)
- Samuel Valable
- Normandie-Univ, UNICAEN, CEA, CNRS, GIP CYCERON, ISTCT/CERVOxy group, Caen, France
| | - Jérôme Toutain
- Normandie-Univ, UNICAEN, CEA, CNRS, GIP CYCERON, ISTCT/CERVOxy group, Caen, France
| | - Didier Divoux
- Normandie-Univ, UNICAEN, CEA, CNRS, GIP CYCERON, ISTCT/CERVOxy group, Caen, France
| | - Laurent Chazalviel
- Normandie-Univ, UNICAEN, CEA, CNRS, GIP CYCERON, ISTCT/CERVOxy group, Caen, France
| | | | - Ararat Chakhoyan
- Normandie-Univ, UNICAEN, CEA, CNRS, GIP CYCERON, ISTCT/CERVOxy group, Caen, France
| | - Stéphane Guillouet
- Normandie-Univ, UNICAEN, CEA, CNRS, GIP CYCERON, ISTCT/LDM-TEP group, Caen, France
| | - Myriam Bernaudin
- Normandie-Univ, UNICAEN, CEA, CNRS, GIP CYCERON, ISTCT/CERVOxy group, Caen, France
| | - Emmanuel L Barbier
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble, France
| | - Omar Touzani
- Normandie-Univ, UNICAEN, CEA, CNRS, GIP CYCERON, ISTCT/CERVOxy group, Caen, France
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Courteau A, McGrath J, Walker PM, Presles B, Garipov R, Cochet A, Brunotte F, Vrigneaud JM. A Practical Quality Assurance Procedure for Data Acquisitions in Preclinical Simultaneous PET/MR Systems. Mol Imaging Biol 2022; 25:450-463. [PMID: 36478075 PMCID: PMC10172259 DOI: 10.1007/s11307-022-01787-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 10/17/2022] [Accepted: 11/09/2022] [Indexed: 12/12/2022]
Abstract
AbstractThe availability of preclinical simultaneous PET/MR imaging systems has been increasing in recent years. Therefore, this technique is progressively moving from the hands of pure physicists towards those of scientists more involved in pharmacology and biology. Unfortunately, these combined scanners can be prone to artefacts and deviation of their characteristics under the influence of external factors or mutual interference between subsystems. This may compromise the image quality as well as the quantitative aspects of PET and MR data. Hence, quality assurance is crucial to avoid loss of animals and experiments. A possible risk to the acceptance of quality control by preclinical teams is that the complexity and duration of this quality control are increased by the addition of MR and PET tests. To avoid this issue, we have selected over the past 5 years, simple tests that can be easily and quickly performed each day before starting an animal PET/MR acquisition. These tests can be performed by the person in charge of the experiment even if this person has a limited expertise in instrumentation and performance evaluation. In addition to these daily tests, other tests are suggested for an advanced system follow-up at a lower frequency. In the present paper, the proposed tests are sorted by periodicity from daily to annual. Besides, we have selected test materials that are available at moderate cost either commercially or through 3D printing.
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Affiliation(s)
- Alan Courteau
- ImViA Laboratory, EA 7535, University of Burgundy, 21000, Dijon, France.
- Georges-François Leclerc Cancer Centre, Unicancer, 21000, Dijon, France.
| | | | - Paul Michael Walker
- ImViA Laboratory, EA 7535, University of Burgundy, 21000, Dijon, France
- University Hospital Centre François Mitterrand, 21000, Dijon, France
| | - Benoît Presles
- ImViA Laboratory, EA 7535, University of Burgundy, 21000, Dijon, France
| | | | - Alexandre Cochet
- ImViA Laboratory, EA 7535, University of Burgundy, 21000, Dijon, France
- Georges-François Leclerc Cancer Centre, Unicancer, 21000, Dijon, France
- University Hospital Centre François Mitterrand, 21000, Dijon, France
| | - François Brunotte
- ImViA Laboratory, EA 7535, University of Burgundy, 21000, Dijon, France
| | - Jean-Marc Vrigneaud
- ImViA Laboratory, EA 7535, University of Burgundy, 21000, Dijon, France
- Georges-François Leclerc Cancer Centre, Unicancer, 21000, Dijon, France
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Mezrich RS. Shine a Light: Listen to the Echo of Disease-Using Photoacoustic Imaging to Evaluate Diabetic Foot and Wound Healing. Radiology 2022; 303:474-475. [PMID: 35191743 DOI: 10.1148/radiol.213025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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El-Sharkawy YH, Aref MH, Elbasuney S, Radwan SM, El-Sayyad GS. Oxygen saturation measurements using novel diffused reflectance with hyperspectral imaging: Towards facile COVID-19 diagnosis. OPTICAL AND QUANTUM ELECTRONICS 2022; 54:322. [PMID: 35571992 PMCID: PMC9080549 DOI: 10.1007/s11082-022-03658-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 03/02/2022] [Indexed: 05/13/2023]
Abstract
Oxygen saturation level plays a vital role in screening, diagnosis, and therapeutic assessment of disease's assortment. There is an urgent need to design and implement early detection devices and applications for the COVID-19 pandemic; this study reports on the development of customized, highly sensitive, non-invasive, non-contact diffused reflectance system coupled with hyperspectral imaging for mapping subcutaneous blood circulation depending on its oxygen saturation level. The forearm of 15 healthy adult male volunteers with age range of (20-38 years) were illuminated via a polychromatic light source of a spectrum range 400-980 nm. Each patient had been scanned five times to calculate the mean spectroscopic reflectance images using hyperspectral camera. The customized signal processing algorithm includes normalization and moving average filter for noise removal. Afterward, employing K-means clustering for image segmentation to assess the accuracy of blood oxygen saturation (SpO2) levels. The reliability of the developed diffused reflectance system was verified with the ground truth technique, a standard pulse oximeter. Non-invasive, non-contact diffused reflectance spectrum demonstrated maximum signal variation at 610 nm according to SpO2 level. Statistical analysis (mean, standard deviation) of diffused reflectance hyperspectral images at 610 nm offered precise calibrated measurements to the standard pulse oximeter. Diffused reflectance associated with hyperspectral imaging is a prospective technique to assist with phlebotomy and vascular approach. Additionally, it could permit future surgical or pharmacological intercessions that titrate or limit ischemic injury continuously. Furthermore, this technique could offer a fast reliable indication of SpO2 levels for COVID-19 diagnosis.
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Affiliation(s)
- Yasser H. El-Sharkawy
- Head of Biomedical Engineering Department, Military Technical College, Egyptian Armed Forces, Cairo, Egypt
| | - Mohamed Hisham Aref
- Biomedical Engineering Department, Military Technical College, Egyptian Armed Forces, Cairo, Egypt
| | - Sherif Elbasuney
- Head of Nanotechnology Research Center, Military Technical College, Egyptian Armed Forces, Cairo, Egypt
| | - Sara M. Radwan
- Biochemistry Department, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Gharieb S. El-Sayyad
- Microbiology and Immunology Department, Faculty of Pharmacy, Galala University, New Galala city, Suez, Egypt
- Chemical Engineering Department, Military Technical College, Egyptian Armed Forces, Cairo, Egypt
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Wei Z, Xu J, Chen L, Hirschler L, Barbier EL, Li T, Wong PC, Lu H. Brain metabolism in tau and amyloid mouse models of Alzheimer's disease: An MRI study. NMR IN BIOMEDICINE 2021; 34:e4568. [PMID: 34050996 PMCID: PMC9574887 DOI: 10.1002/nbm.4568] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 05/17/2021] [Accepted: 05/20/2021] [Indexed: 06/12/2023]
Abstract
Alzheimer's disease (AD) is the leading cause of cognitive impairment and dementia in elderly individuals. According to the current biomarker framework for "unbiased descriptive classification", biomarkers of neurodegeneration, "N", constitute a critical component in the tri-category "A/T/N" system. Current biomarkers of neurodegeneration suffer from potential drawbacks such as requiring invasive lumbar puncture, involving ionizing radiation, or representing a late, irreversible marker. Recent human studies have suggested that reduced brain oxygen metabolism may be a new functional marker of neurodegeneration in AD, but the heterogeneity and the presence of mixed pathology in human patients did not allow a full understanding of the role of oxygen extraction and metabolism in AD. In this report, global brain oxygen metabolism and related physiological parameters were studied in two AD mouse models with relatively pure pathology, using advanced MRI techniques including T2 -relaxation-under-spin-tagging (TRUST) and phase contrast (PC) MRI. Additionally, regional cerebral blood flow (CBF) was determined with pseudocontinuous arterial spin labeling. Reduced global oxygen extraction fraction (by -18.7%, p = 0.008), unit-mass cerebral metabolic rate of oxygen (CMRO2 ) (by -17.4%, p = 0.04) and total CMRO2 (by -30.8%, p < 0.001) were observed in Tau4RΔK mice-referred to as the tau AD model-which manifested pronounced neurodegeneration, as measured by diminished brain volume (by -15.2%, p < 0.001). Global and regional CBF in these mice were not different from those of wild-type mice (p > 0.05), suggesting normal vascular function. By contrast, in B6;SJL-Tg [APPSWE]2576Kha (APP) mice-referred to as the amyloid AD model-no brain volume reduction, as well as relatively intact brain oxygen extraction and metabolism, were found (p > 0.05). Consistent with the imaging data, behavioral measures of walking distance were impaired in Tau4RΔK mice (p = 0.004), but not in APP mice (p = 0.88). Collectively, these findings support the hypothesis that noninvasive MRI measurement of brain oxygen metabolism may be a promising biomarker of neurodegeneration in AD.
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Affiliation(s)
- Zhiliang Wei
- Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- F. M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Research Institute, Baltimore, Maryland, USA
| | - Jiadi Xu
- Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- F. M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Research Institute, Baltimore, Maryland, USA
| | - Lin Chen
- Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- F. M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Research Institute, Baltimore, Maryland, USA
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen, Fujian, China
| | - Lydiane Hirschler
- Université Grenoble Alpes, Inserm, U1216, Grenoble Institut Neurosciences, Grenoble, France
- C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Emmanuel L. Barbier
- Université Grenoble Alpes, Inserm, U1216, Grenoble Institut Neurosciences, Grenoble, France
| | - Tong Li
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Philip C. Wong
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Hanzhang Lu
- Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- F. M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Research Institute, Baltimore, Maryland, USA
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Boux F, Forbes F, Collomb N, Zub E, Mazière L, de Bock F, Blaquiere M, Stupar V, Depaulis A, Marchi N, Barbier EL. Neurovascular multiparametric MRI defines epileptogenic and seizure propagation regions in experimental mesiotemporal lobe epilepsy. Epilepsia 2021; 62:1244-1255. [PMID: 33818790 DOI: 10.1111/epi.16886] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 03/05/2021] [Accepted: 03/05/2021] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Improving the identification of the epileptogenic zone and associated seizure-spreading regions represents a significant challenge. Innovative brain-imaging modalities tracking neurovascular dynamics during seizures may provide new disease biomarkers. METHODS With use of a multi-parametric magnetic resonance imaging (MRI) analysis at 9.4 Tesla, we examined, elaborated, and combined multiple cellular and cerebrovascular MRI read-outs as imaging biomarkers of the epileptogenic and seizure-propagating regions. Analyses were performed in an experimental model of mesial temporal lobe epilepsy (MTLE) generated by unilateral intra-hippocampal injection of kainic acid (KA). RESULTS In the ipsilateral epileptogenic hippocampi, tissue T1 and blood-brain barrier (BBB) permeability to gadolinium were increased 48-72 hours post-KA, as compared to sham and contralateral hippocampi. BBB permeability endured during spontaneous focal seizures (4-6 weeks), along with a significant increase of apparent diffusion coefficient (ADC) and blood volume fraction (BVf). Simultaneously, ADC and BVf were augmented in the contralateral hippocampus, a region characterized by electroencephalographic seizure spreading, discrete histological neurovascular cell modifications, and no tissue sclerosis. We next asked whether combining all the acquired MRI parameters could deliver criteria to classify the epileptogenic from the seizure-spreading and sham hippocampi in these experimental conditions and over time. To differentiate sham from epileptogenic areas, the automatic multi-parametric classification provided a maximum accuracy of 97.5% (32 regions) 48-72 hours post-KA and of 100% (60 regions) at spontaneous seizures stage. To differentiate sham, epileptogenic, and seizure-spreading areas, the accuracies of the automatic classification were 93.1% (42 regions) 48-72 hours post-KA and 95% (80 regions) at spontaneous seizure stage. SIGNIFICANCE Combining multi-parametric MRI acquisition and machine-learning analyses delivers specific imaging identifiers to segregate the epileptogenic from the contralateral seizure-spreading hippocampi in experimental MTLE. The potential clinical value of our findings is critically discussed.
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Affiliation(s)
- Fabien Boux
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France.,Inria, CNRS, G-INP, University of Grenoble Alpes, Grenoble, France
| | - Florence Forbes
- Inria, CNRS, G-INP, University of Grenoble Alpes, Grenoble, France
| | - Nora Collomb
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
| | - Emma Zub
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (University of Montpellier, UMR 5203 CNRS, U 1191 INSERM), Montpellier, France
| | - Lucile Mazière
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
| | - Fréderic de Bock
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (University of Montpellier, UMR 5203 CNRS, U 1191 INSERM), Montpellier, France
| | - Marine Blaquiere
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (University of Montpellier, UMR 5203 CNRS, U 1191 INSERM), Montpellier, France
| | - Vasile Stupar
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
| | - Antoine Depaulis
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
| | - Nicola Marchi
- Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (University of Montpellier, UMR 5203 CNRS, U 1191 INSERM), Montpellier, France
| | - Emmanuel L Barbier
- Univ. Grenoble Alpes, Grenoble Institut Neurosciences, Inserm, U1216, Grenoble 38000, France
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Delineation of the Arm Blood Vessels Utilizing Hyperspectral Imaging to Assist with Phlebotomy for Exploiting the Cutaneous Tissue Oxygen Concentration. Photodiagnosis Photodyn Ther 2021; 33:102190. [PMID: 33508500 DOI: 10.1016/j.pdpdt.2021.102190] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 01/01/2021] [Accepted: 01/15/2021] [Indexed: 10/22/2022]
Abstract
SIGNIFICANCE The estimation of tissue oxygenation is vital in the diagnosis and therapeutic evaluation of a huge assortment of diseases. The hyperspectral (HS) imaging system is a rising innovation that can be utilized to build a highly sensitive, non-invasive, and tissue hemoglobin immersion map. OBJECTIVE As a result of the urgent need to design and implement early detection devices and applications for the COVID-19 pandemic, we propose building a non-invasive custom optical imaging system to assist with phlebotomy and vascular approach to survey the reliability of blood oxygen saturation (SpO2) levels recovered from spectral images. MATERIALS AND METHODS HS images were gathered from 15 healthy subjects without previous medical history complications and with an average age range of 20 to 38 years, who were undergoing phlebotomy. The forearm was vigorously illuminated utilizing an HS camera with polychromatic source light of spectrum range (400∼980 nm). Spectroscopic reflectance images were caught by a focal plane exhibit for the region of interest (ROI). Then the custom algorithm comprising normalization and moving average filtering for noise removal was applied, followed by K-mean clustering for image segmentation to visualize and highlight the arteries and the veins in the investigated forearm. RESULTS The investigations show that after normalization of the recorded signal from the HS camera of the participating subjects it was noticed that at wavelength of 460 nm the oxygenated arteries had a stronger signal than the de-oxygenated veins, and at a wavelength of 750 nm the de-oxygenated veins had a stronger signal than the oxygenated arteries. Thus, the ideal wavelength to reveal the oxygenated arteries was 460 nm, and the ideal wavelength to reveal the de-oxygenated veins was 750 nm. CONCLUSIONS HSI is a prospective technique to assist with phlebotomy and non-contact oxygen saturation approach. Additionally, it may permit future surgical or pharmacological intercessions that titrate or limit ischemic injury continuously.
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Little PV, Kraft SE, Chireh A, Damberg P, Holmin S. Oxygen metabolism MRI - A comparison with perfusion imaging in a rat model of MCA branch occlusion and reperfusion. J Cereb Blood Flow Metab 2020; 40:2315-2327. [PMID: 31842668 PMCID: PMC7585917 DOI: 10.1177/0271678x19892271] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 10/29/2019] [Accepted: 11/01/2019] [Indexed: 11/17/2022]
Abstract
The penumbra is sustained by an increased extraction of oxygen (OEF) from blood to brain tissue. Metabolic imaging may improve penumbra specificity when examining stroke patients with wake-up stroke and a long time between admission and symptom onset. We used MRI to examine OEF, and compared the volume of regions with elevated OEF to the volume of regions with perfusion deficit in a M2 occlusion model (M2CAO) with preserved collateral blood flow. OEF was calculated from BOLD MRI examining tissue R2', with ASL perfusion imaging employed to determine cerebral blood flows (CBF) and volumes. Diffusion imaging was used to identify the ischemic core (IC). Examinations were performed during and after transient M2CAO in rats. The IC-OEF mismatch was significantly smaller than the IC-CBF mismatch during M2CAO. The penumbra OEF was significantly increased during M2CAO, and decreased significantly after reperfusion. The IC-OEF mismatch may provide increased penumbra specificity compared to IC-CBF mismatch regimens. Results strongly indicate the potential of metabolic MRI for thrombectomy patient selection in cases with a long time from symptom onset to admission. Results demonstrate the effectiveness of reperfusion in alleviating metabolic disturbances in ischemic regions, emphasizing fast treatment to achieve significant neurological recovery in stroke patients.
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Affiliation(s)
- Philip V Little
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Department of Neuroradiology, BioClinicum, Karolinska University Hospital, Stockholm, Sweden
| | - Sandra E Kraft
- Karolinska Experimental Research and Imaging Center (KERIC), Karolinska University Hospital-Solna, Stockholm, Sweden
| | - Arvin Chireh
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Department of Neuroradiology, BioClinicum, Karolinska University Hospital, Stockholm, Sweden
| | - Peter Damberg
- Karolinska Experimental Research and Imaging Center (KERIC), Karolinska University Hospital-Solna, Stockholm, Sweden
| | - Staffan Holmin
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Department of Neuroradiology, BioClinicum, Karolinska University Hospital, Stockholm, Sweden
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13
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Guan Y, Niu H, Dang Y, Gao N, Guan J. Photoluminescent oxygen-release microspheres to image the oxygen release process in vivo. Acta Biomater 2020; 115:333-342. [PMID: 32853800 DOI: 10.1016/j.actbio.2020.08.031] [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: 06/30/2020] [Revised: 08/13/2020] [Accepted: 08/18/2020] [Indexed: 02/08/2023]
Abstract
Cell therapy is a promising strategy to treat ischemic diseases, but the efficacy is limited due to high rate of cell death under low oxygen environment of the ischemic tissues. Sustained release of oxygen to continuously oxygenate the transplanted cells may augment cell survival and improve therapeutic efficacy. We have shown previously that oxygen released from oxygen-release microspheres stimulated cell survival in ischemic tissue [1]. To understand how oxygen is released in vivo and duration of release, it is attractive to image the process of oxygen release. Herein, we have developed photoluminenscent oxygen-release microspheres where the in vivo oxygen release can be non-invasively and real-time monitored by an In Vivo Imaging System (IVIS). In the oxygen-release microspheres, a complex of polyvinylpyrrolidone, H2O2 and a fluorescent drug hypericin (HYP) was used as core, and poly(N-isopropylacrylamide-co-acrylate-oligolactide-co-hydroxyethyl methacrylate-co-N-acryloxysuccinimide) conjugated with catalase was used as shell. To distinguish fluorescent signal change for different oxygen release kinetics, the microspheres with various release profiles were developed by using the shell with different degradation rates. In vitro, the fluorescent intensity gradually decreased during the 21-day oxygen release period, consistent with oxygen release kinetics. The released oxygen significantly augmented mesenchymal stem cell (MSC) survival under hypoxic condition. In vivo, the oxygen release rate was faster. The fluorescent signal can be detected for 17 days for the microspheres with the slowest oxygen release kinetics. The implanted microspheres did not induce substantial inflammation. The above results demonstrate that the developed microspheres have potential to monitor the in vivo oxygen release.
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14
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Hypertonic Sodium Lactate to Alleviate Functional Deficits Following Diffuse Traumatic Brain Injury: An Osmotic or a Lactate-Related Effect? Neurocrit Care 2020; 34:795-803. [PMID: 32901380 DOI: 10.1007/s12028-020-01090-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 08/26/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND There has been growing interest in the use of hypertonic sodium lactate (HSL) solution following traumatic brain injury (TBI) in humans. However, little is known about the effects of HSL on functional deficits with respect to the hyperosmotic nature of HSL. METHODS We have compared the effects of HSL solution and isotonic saline solution using sensorimotor and cognitive tests for 14 days post-trauma in animals. Thirty minutes after trauma (impact-acceleration model), anesthetized rats were randomly allocated to receive a 2-h infusion of isotonic saline solution (TBI-saline group) or HSL (TBI-HSL group) (n = 10 rats per group). In another series of experiments using a similar protocol, the effects of equiosmolar doses of HSL and hypertonic saline solution (HSS) were compared in TBI rats (n = 10 rats per group). Blood lactate and ion concentrations were measured during the 2-h infusions. RESULTS Compared to the TBI-saline group, the TBI-HSL group had a reduced latency to complete the adhesive removal test: 6 s (5-9) (median [25-75th centiles]) versus 13 s (8-17) on day 7, and 5 s (5-9) versus 11 s (8-26) on day 14 (P < 0.05), respectively, and a shorter delay to complete the radial arm maze test on day 7: 99 s (73-134) versus 176 s (127-300), respectively (P < 0.05). However, no differences were found between the TBI-HSL and TBI-HSS groups in neurocognitive tests performance. Compared to the TBI-saline group, the HSL and HSS groups had higher serum osmolality: 318 mOsm/Kg (315-321) and 315 mOsm/Kg (313-316) versus 307 mOsm/Kg (305-309), respectively (P < 0.05), and the HSL group had a higher serum lactate concentration: 6.4 mmol/L (5.3-7.2) versus 1.5 mmol/L (1.1-1.9) and 1.6 mmol/L (1.5-1.7), respectively (P < 0.05). CONCLUSIONS These results indicate that improvements in cognitive and sensorimotor tests with HSL infusion post-TBI could be related to elevation of serum osmolality, not to exogenous administration of lactate.
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15
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Gérard M, Corroyer-Dulmont A, Lesueur P, Collet S, Chérel M, Bourgeois M, Stefan D, Limkin EJ, Perrio C, Guillamo JS, Dubray B, Bernaudin M, Thariat J, Valable S. Hypoxia Imaging and Adaptive Radiotherapy: A State-of-the-Art Approach in the Management of Glioma. Front Med (Lausanne) 2019; 6:117. [PMID: 31249831 PMCID: PMC6582242 DOI: 10.3389/fmed.2019.00117] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 05/13/2019] [Indexed: 01/31/2023] Open
Abstract
Severe hypoxia [oxygen partial pressure (pO2) below 5–10 mmHg] is more frequent in glioblastoma multiforme (GBM) compared to lower-grade gliomas. Seminal studies in the 1950s demonstrated that hypoxia was associated with increased resistance to low–linear energy transfer (LET) ionizing radiation. In experimental conditions, the total radiation dose has to be multiplied by a factor of 3 to achieve the same cell lethality in anoxic situations. The presence of hypoxia in human tumors is assumed to contribute to treatment failures after radiotherapy (RT) in cancer patients. Therefore, a logical way to overcome hypoxia-induced radioresistance would be to deliver substantially higher doses of RT in hypoxic volumes delineated on pre-treatment imaging as biological target volumes (BTVs). Such an approach faces various fundamental, technical, and clinical challenges. The present review addresses several technical points related to the delineation of hypoxic zones, which include: spatial accuracy, quantitative vs. relative threshold, variations of hypoxia levels during RT, and availability of hypoxia tracers. The feasibility of hypoxia imaging as an assessment tool for early tumor response to RT and for predicting long-term outcomes is discussed. Hypoxia imaging for RT dose painting is likewise examined. As for the radiation oncologist's point of view, hypoxia maps should be converted into dose-distribution objectives for RT planning. Taking into account the physics and the radiobiology of various irradiation beams, preliminary in silico studies are required to investigate the feasibility of dose escalation in terms of normal tissue tolerance before clinical trials are undertaken.
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Affiliation(s)
- Michael Gérard
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France.,Department of Radiation Oncology, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | | | - Paul Lesueur
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France.,Department of Radiation Oncology, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | - Solène Collet
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France.,Department of Radiophysics, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | - Michel Chérel
- Team 13-Nuclear Oncology, INSERM U1232 Centre de Recherche en Cancérologie et Immunologie Nantes Angers (CRCINA), Nantes, France
| | - Mickael Bourgeois
- Team 13-Nuclear Oncology, INSERM U1232 Centre de Recherche en Cancérologie et Immunologie Nantes Angers (CRCINA), Nantes, France
| | - Dinu Stefan
- Department of Radiation Oncology, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | - Elaine Johanna Limkin
- Department of Radiotherapy, Gustave Roussy, Université Paris-Saclay, Villejuif, France
| | - Cécile Perrio
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/LDM-TEP Group, GIP Cyceron, Caen, France
| | - Jean-Sébastien Guillamo
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France.,Department of Neurology, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
| | - Bernard Dubray
- Département de Radiothérapie et de Physique Médicale, Laboratoire QuantIF-LITIS [EA 4108], Centre de Lutte Contre le Cancer Henri Becquerel, Université de Normandie, Rouen, France
| | - Myriam Bernaudin
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France
| | - Juliette Thariat
- Department of Radiation Oncology, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | - Samuel Valable
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France
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Eker OF, Ameli R, Makris N, Jurkovic T, Montigon O, Barbier EL, Cho TH, Nighoghossian N, Berthezène Y. MRI Assessment of Oxygen Metabolism and Hemodynamic Status in Symptomatic Intracranial Atherosclerotic Stenosis: A Pilot Study. J Neuroimaging 2019; 29:467-475. [DOI: 10.1111/jon.12615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 03/14/2019] [Accepted: 03/17/2019] [Indexed: 10/27/2022] Open
Affiliation(s)
- Omer F. Eker
- Department of NeuroradiologyHospices Civils de Lyon Bron France
- CREATIS CNRS UMR 5220, INSERM U1044 Villeurbanne cedex France
| | - Roxana Ameli
- Department of NeuroradiologyHospices Civils de Lyon Bron France
| | - Nikolaos Makris
- CREATIS CNRS UMR 5220, INSERM U1044 Villeurbanne cedex France
| | - Thomas Jurkovic
- Department of NeuroradiologyHospices Civils de Lyon Bron France
| | - Olivier Montigon
- INSERM U1216Grenoble Institut des Neurosciences La Tronche France
| | - Emmanuel L. Barbier
- INSERM U1216Grenoble Institut des Neurosciences La Tronche France
- Université Grenoble Alpes Saint‐Martin‐d'Hères France
| | - Tae Hee Cho
- CREATIS CNRS UMR 5220, INSERM U1044 Villeurbanne cedex France
| | | | - Yves Berthezène
- Department of NeuroradiologyHospices Civils de Lyon Bron France
- CREATIS CNRS UMR 5220, INSERM U1044 Villeurbanne cedex France
- Department of Vascular Neurology, Hospices Civils de LyonHôpital Pierre Wertheimer Bron France
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17
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Maralani PJ, Das S, Mainprize T, Phan N, Bharatha A, Keith J, Munoz DG, Sahgal A, Symons S, Ironside S, Faraji-Dana Z, Eilaghi A, Chan A, Alcaide-Leon P, Shearkhani O, Jakubovic R, Atenafu EG, Zaharchuk G, Mikulis D. Hypoxia Detection in Infiltrative Astrocytoma: Ferumoxytol-based Quantitative BOLD MRI with Intraoperative and Histologic Validation. Radiology 2018; 288:821-829. [DOI: 10.1148/radiol.2018172601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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18
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Broisat A, Lemasson B, Ahmadi M, Collomb N, Bacot S, Soubies A, Fagret D, Rémy C, Ghezzi C, Barbier EL. Mapping of brain tissue hematocrit in glioma and acute stroke using a dual autoradiography approach. Sci Rep 2018; 8:9878. [PMID: 29959336 PMCID: PMC6026160 DOI: 10.1038/s41598-018-28082-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 06/15/2018] [Indexed: 11/09/2022] Open
Abstract
Hematocrit (Hct) determines the ability of blood to carry oxygen. While changes in systemic Hct are known to impact stroke or tumor control, changes in local (tissue) Hct (tHct) induced by these diseases have however received little attention. In this study, we evaluate tHct in acute stroke and in glioma models using a new approach to map tHct across the brain, a dual isotope autoradiography, based on injections of 125I-labeled albumin and 99mTc-lalbeled red blood cells in the same animal. For validation purpose, tHct was mapped in the rat brain (i) under physiological conditions, (ii) following erythropoietin injection, and (iii) following hemodilution. Then, tHct was then mapped in stroke (middle cerebral artery occlusion) and tumor models (9LGS and C6). The mean tHct values observed in healthy brains (tHct = 29 ± 1.3%), were modified as expected by erythropoietin (tHct = 36.7 ± 2.6%) and hemodilution (tHct = 24.2 ± 2.4%). Using the proposed method, we observed a local reduction, spatially heterogeneous, in tHct following acute stroke (tHct = 19.5 ± 2.5%) and in both glioma models (9LGS: tHct = 18.5 ± 2.3%, C6: tHct = 16.1 ± 1.2%). This reduction and this heterogeneity in tHct observed in stroke and glioma raises methodological issues in perfusion imaging techniques where tHct is generally overlooked and could impact therapeutic strategies.
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Affiliation(s)
- A Broisat
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - B Lemasson
- Univ. Grenoble Alpes, Inserm, U1216, GIN, F-38000, Grenoble, France
| | - M Ahmadi
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - N Collomb
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, IRMaGe, CNRS, F-38000, Grenoble, France
| | - S Bacot
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - A Soubies
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - D Fagret
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - C Rémy
- Univ. Grenoble Alpes, Inserm, U1216, GIN, F-38000, Grenoble, France
| | - C Ghezzi
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, U1039, LRB, F-38000, Grenoble, France
| | - E L Barbier
- Univ. Grenoble Alpes, Inserm, U1216, GIN, F-38000, Grenoble, France.
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19
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Harutyunyan G, Harutyunyan G, Mkhoyan G. New Viewpoint in Exaggerated Increase of PtiO 2 With Normobaric Hyperoxygenation and Reasons to Limit Oxygen Use in Neurotrauma Patients. Front Med (Lausanne) 2018; 5:119. [PMID: 29872657 PMCID: PMC5972302 DOI: 10.3389/fmed.2018.00119] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 04/10/2018] [Indexed: 01/06/2023] Open
Affiliation(s)
| | | | - Gagik Mkhoyan
- Anesthesiology and Intensive Care, Erebouni Medical Center, Yerevan, Armenia
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20
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Millet A, Cuisinier A, Bouzat P, Batandier C, Lemasson B, Stupar V, Pernet-Gallay K, Crespy T, Barbier EL, Payen JF. Hypertonic sodium lactate reverses brain oxygenation and metabolism dysfunction after traumatic brain injury. Br J Anaesth 2018; 120:1295-1303. [PMID: 29793596 DOI: 10.1016/j.bja.2018.01.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 12/20/2017] [Accepted: 01/30/2018] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The mechanisms by which hypertonic sodium lactate (HSL) solution act in injured brain are unclear. We investigated the effects of HSL on brain metabolism, oxygenation, and perfusion in a rodent model of diffuse traumatic brain injury (TBI). METHODS Thirty minutes after trauma, anaesthetised adult rats were randomly assigned to receive a 3 h infusion of either a saline solution (TBI-saline group) or HSL (TBI-HSL group). The sham-saline and sham-HSL groups received no insult. Three series of experiments were conducted up to 4 h after TBI (or equivalent) to investigate: 1) brain oedema using diffusion-weighted magnetic resonance imaging and brain metabolism using localized 1H-magnetic resonance spectroscopy (n = 10 rats per group). The respiratory control ratio was then determined using oxygraphic analysis of extracted mitochondria, 2) brain oxygenation and perfusion using quantitative blood-oxygenation-level-dependent magnetic resonance approach (n = 10 rats per group), and 3) mitochondrial ultrastructural changes (n = 1 rat per group). RESULTS Compared with the TBI-saline group, the TBI-HSL and the sham-operated groups had reduced brain oedema. Concomitantly, the TBI-HSL group had lower intracellular lactate/creatine ratio [0.049 (0.047-0.098) vs 0.097 (0.079-0.157); P < 0.05], higher mitochondrial respiratory control ratio, higher tissue oxygen saturation [77% (71-79) vs 66% (55-73); P < 0.05], and reduced mitochondrial cristae thickness in astrocytes [27.5 (22.5-38.4) nm vs 38.4 (31.0-47.5) nm; P < 0.01] compared with the TBI-saline group. Serum sodium and lactate concentrations and serum osmolality were higher in the TBI-HSL than in the TBI-saline group. CONCLUSIONS These findings indicate that the hypertonic sodium lactate solution can reverse brain oxygenation and metabolism dysfunction after traumatic brain injury through vasodilatory, mitochondrial, and anti-oedema effects.
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Affiliation(s)
- A Millet
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France; Pôle Couple Enfant, Hôpital Michallon, CHU Grenoble Alpes, Grenoble, France
| | - A Cuisinier
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France; Pôle Anesthésie Réanimation, Hôpital Michallon, CHU Grenoble Alpes, Grenoble, France
| | - P Bouzat
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France; Pôle Anesthésie Réanimation, Hôpital Michallon, CHU Grenoble Alpes, Grenoble, France
| | - C Batandier
- Institut National de la Santé et de la Recherche Médicale, U1055, Laboratoire de Bioénergétique Fondamentale et Appliquée, Université Grenoble Alpes, Grenoble, France
| | - B Lemasson
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France
| | - V Stupar
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France
| | - K Pernet-Gallay
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France
| | - T Crespy
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France; Pôle Anesthésie Réanimation, Hôpital Michallon, CHU Grenoble Alpes, Grenoble, France
| | - E L Barbier
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France
| | - J F Payen
- Institut National de la Santé et de la Recherche Médicale, Grenoble, France; Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France; Pôle Anesthésie Réanimation, Hôpital Michallon, CHU Grenoble Alpes, Grenoble, France.
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21
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Lee HJ, Kadbi M, Bosco G, Ibbott GS. Real-time volumetric relative dosimetry for magnetic resonance-image-guided radiation therapy (MR-IGRT). Phys Med Biol 2018; 63:045021. [PMID: 29384731 DOI: 10.1088/1361-6560/aaac22] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The integration of magnetic resonance imaging (MRI) with linear accelerators (linac) has enabled the use of 3D MR-visible gel dosimeters for real-time verification of volumetric dose distributions. Several iron-based radiochromic 3D gels were created in-house then imaged and irradiated in a pre-clinical 1.5 T-7 MV MR-Linac. MR images were acquired using a range of balanced-fast field echo (b-FFE) sequences during irradiation to assess the contrast and dose response in irradiated regions and to minimize the presence of MR artifacts. Out of four radiochromic 3D gel formulations, the FOX 3D gel was found to provide superior MR contrast in the irradiated regions. The FOX gels responded linearly with respect to real-time dose and the signal remained stable post-irradiation for at least 20 min. The response of the FOX gel also was found to be unaffected by the radiofrequency and gradient fields created by the b-FFE sequence during irradiation. A reusable version of the FOX gel was used for b-FFE sequence optimization to reduce artifacts by increasing the number of averages at the expense of temporal resolution. Regardless of the real-time MR sequence used, the FOX 3D gels responded linearly to dose with minimal magnetic field effects due to the strong 1.5 T field or gradient fields present during imaging. These gels can easily be made in-house using non-reusable and reusable formulations depending on the needs of the clinic, and the results of this study encourage further applications of 3D gels for MR-IGRT applications.
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Affiliation(s)
- Hannah J Lee
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, United States of America. The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX, United States of America. The University of Texas MD Anderson Cancer Center, 1400 Pressler Street, Houston, TX 77030, United States of America
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22
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Cerebrovascular heterogeneity and neuronal excitability. Neurosci Lett 2018; 667:75-83. [DOI: 10.1016/j.neulet.2017.01.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 01/04/2017] [Accepted: 01/06/2017] [Indexed: 01/01/2023]
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Preibisch C, Shi K, Kluge A, Lukas M, Wiestler B, Göttler J, Gempt J, Ringel F, Al Jaberi M, Schlegel J, Meyer B, Zimmer C, Pyka T, Förster S. Characterizing hypoxia in human glioma: A simultaneous multimodal MRI and PET study. NMR IN BIOMEDICINE 2017; 30:e3775. [PMID: 28805936 DOI: 10.1002/nbm.3775] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 06/19/2017] [Accepted: 06/29/2017] [Indexed: 06/07/2023]
Abstract
Hypoxia plays an important role for the prognosis and therapy response of cancer. Thus, hypoxia imaging would be a valuable tool for pre-therapeutic assessment of tumor malignancy. However, there is no standard validated technique for clinical application available yet. Therefore, we performed a study in 12 patients with high-grade glioma, where we directly compared the two currently most promising techniques, namely the MR-based relative oxygen extraction fraction (MR-rOEF) and the PET hypoxia marker H-1-(3-[18 F]-fluoro-2-hydroxypropyl)-2-nitroimidazole ([18 F]-FMISO). MR-rOEF was determined from separate measurements of T2 , T2 * and relative cerebral blood volume (rCBV) employing a multi-parametric approach for quantification of the blood-oxygenation-level-dependent (BOLD) effect. With respect to [18 F]-FMISO-PET, besides the commonly used late uptake between 120 and 130 min ([18 F]-FMISO120-130 min ), we also analyzed the hypoxia specific uptake rate [18 F]-FMISO-k3 , as obtained by pharmacokinetic modeling of dynamic uptake data. Since pharmacokinetic modeling of partially acquired dynamic [18 F]-FMISO data was sensitive to a low signal-to-noise-ratio, analysis was restricted to high-uptake tumor regions. Individual spatial analyses of deoxygenation and hypoxia-related parameter maps revealed that high MR-rOEF values clustered in (edematous) peritumoral tissue, while areas with high [18 F]-FMISO120-130 min concentrated in and around active tumor with disrupted blood-brain barrier, i.e. contrast enhancement in T1 -weighted MRI. Volume-of-interest-based correlations between MR-rOEF and [18 F]-FMISO120-130 min as well as [18 F]-FMISO-k3 , and voxel-wise analyses in individual patients, yielded limited correlations, supporting the notion that [18 F]-FMISO uptake, even after 2 h, might still be influenced by perfusion while [18 F]-FMISO-k3 was severely hampered by noise. According to these results, vascular deoxygenation, as measured by MR-rOEF, and severe tissue hypoxia, as measured by [18 F]-FMISO, show a poor spatial correspondence. Overall, the two methods appear to rather provide complementary than redundant information about high-grade glioma biology.
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Affiliation(s)
- Christine Preibisch
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
- Clinic for Neurology, Technische Universität München, Munich, Germany
| | - Kuangyu Shi
- Clinic for Nuclear Medicine, Technische Universität München, Munich, Germany
| | - Anne Kluge
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
| | - Mathias Lukas
- Clinic for Nuclear Medicine, Technische Universität München, Munich, Germany
| | - Benedikt Wiestler
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
| | - Jens Göttler
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
| | - Jens Gempt
- Department of Neurosurgery, Technische Universität München, Munich, Germany
| | - Florian Ringel
- Department of Neurosurgery, Technische Universität München, Munich, Germany
| | - Mohamed Al Jaberi
- Department of Neuropathology, Technische Universität München, Munich, Germany
| | - Jürgen Schlegel
- Department of Neuropathology, Technische Universität München, Munich, Germany
| | - Bernhard Meyer
- Department of Neurosurgery, Technische Universität München, Munich, Germany
| | - Claus Zimmer
- Department of Diagnostic and Interventional Neuroradiology, Technische Universität München, Munich, Germany
| | - Thomas Pyka
- Clinic for Nuclear Medicine, Technische Universität München, Munich, Germany
| | - Stefan Förster
- Clinic for Nuclear Medicine, Technische Universität München, Munich, Germany
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Gallez B, Neveu MA, Danhier P, Jordan BF. Manipulation of tumor oxygenation and radiosensitivity through modification of cell respiration. A critical review of approaches and imaging biomarkers for therapeutic guidance. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1858:700-711. [DOI: 10.1016/j.bbabio.2017.01.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 01/05/2017] [Accepted: 01/06/2017] [Indexed: 11/17/2022]
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Valable S, Corroyer-Dulmont A, Chakhoyan A, Durand L, Toutain J, Divoux D, Barré L, MacKenzie ET, Petit E, Bernaudin M, Touzani O, Barbier EL. Imaging of brain oxygenation with magnetic resonance imaging: A validation with positron emission tomography in the healthy and tumoural brain. J Cereb Blood Flow Metab 2017; 37:2584-2597. [PMID: 27702880 PMCID: PMC5531354 DOI: 10.1177/0271678x16671965] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The partial pressure in oxygen remains challenging to map in the brain. Two main strategies exist to obtain surrogate measures of tissue oxygenation: the tissue saturation studied by magnetic resonance imaging (StO2-MRI) and the identification of hypoxia by a positron emission tomography (PET) biomarker with 3-[18F]fluoro-1-(2-nitro-1-imidazolyl)-2-propanol ([18F]-FMISO) as the leading radiopharmaceutical. Nonetheless, a formal validation of StO2-MRI against FMISO-PET has not been performed. The objective of our studies was to compare the two approaches in (a) the normal rat brain when the rats were submitted to hypoxemia; (b) animals implanted with four tumour types differentiated by their oxygenation. Rats were submitted to normoxic and hypoxemic conditions. For the brain tumour experiments, U87-MG, U251-MG, 9L and C6 glioma cells were orthotopically inoculated in rats. For both experiments, StO2-MRI and [18F]-FMISO PET were performed sequentially. Under hypoxemia conditions, StO2-MRI revealed a decrease in oxygen saturation in the brain. Nonetheless, [18F]-FMISO PET, pimonidazole immunohistochemistry and molecular biology were insensitive to hypoxia. Within the context of tumours, StO2-MRI was able to detect hypoxia in the hypoxic models, mimicking [18F]-FMISO PET with high sensitivity/specificity. Altogether, our data clearly support that, in brain pathologies, StO2-MRI could be a robust and specific imaging biomarker to assess hypoxia.
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Affiliation(s)
- Samuel Valable
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | | | - Ararat Chakhoyan
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | - Lucile Durand
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | - Jérôme Toutain
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | - Didier Divoux
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | - Louisa Barré
- 2 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/LDM-TEP Group, Caen, France
| | - Eric T MacKenzie
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | - Edwige Petit
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | - Myriam Bernaudin
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | - Omar Touzani
- 1 Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, Caen, France
| | - Emmanuel L Barbier
- 3 Inserm, U1216, Grenoble, France.,4 Université Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France
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Boisserand LSB, Lemasson B, Hirschler L, Moisan A, Hubert V, Barbier EL, Rémy C, Detante O. Multiparametric magnetic resonance imaging including oxygenation mapping of experimental ischaemic stroke. J Cereb Blood Flow Metab 2017; 37:2196-2207. [PMID: 27466373 PMCID: PMC5464712 DOI: 10.1177/0271678x16662044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Recent advances in MRI methodology, such as microvascular and brain oxygenation (StO2) imaging, may prove useful in obtaining information about the severity of the acute stroke. We assessed the potential of StO2 to detect the ischaemic core in the acute phase compared to apparent diffusion coefficient and to predict the final necrosis. Sprague-Dawley rats (n = 38) were imaged during acute stroke (D0) and 21 days after (D21). A multiparametric MRI protocol was performed at 4.7T to characterize brain damage within three region of interest: 'LesionD0' (diffusion), 'Mismatch' representing penumbra (perfusion/diffusion) and 'Hypoxia' (voxels < 40% of StO2 within the region of interest LesionD0). Voxel-based analysis of stroke revealed heterogeneity of the region of interest LesionD0, which included voxels with different degrees of oxygenation decrease. This finding was supported by a dramatic decrease of vascular and perfusion parameters within the region of interest hypoxia. This zone presented the lowest values of almost all parameters analysed, indicating a higher severity. Our study demonstrates the potential of StO2 magnetic resonance imaging to more accurately detect the ischaemic core without the inclusion of any reversible ischaemic damage. Our follow-up study indicates that apparent diffusion coefficient imaging overestimated the final necrosis while StO2 imaging did not.
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Affiliation(s)
- Ligia Simões Braga Boisserand
- 1 Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France.,2 Inserm, U1216, Grenoble, France.,3 CAPES Foundation, Ministry of Education of Brazil, Brasilia, Brazil
| | - Benjamin Lemasson
- 1 Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France.,2 Inserm, U1216, Grenoble, France
| | - Lydiane Hirschler
- 1 Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France.,2 Inserm, U1216, Grenoble, France.,4 Bruker Biospin, Ettlingen, Germany
| | - Anaïck Moisan
- 1 Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France.,2 Inserm, U1216, Grenoble, France.,5 Cell Therapy and Engineering Unit, EFS Rhône Alpes, Saint Ismier, France
| | - Violaine Hubert
- 1 Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France
| | - Emmanuel L Barbier
- 1 Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France.,2 Inserm, U1216, Grenoble, France
| | - Chantal Rémy
- 1 Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France.,2 Inserm, U1216, Grenoble, France
| | - Olivier Detante
- 1 Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, Grenoble, France.,2 Inserm, U1216, Grenoble, France.,6 CHU Grenoble Alpes, Grenoble, France
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Chakhoyan A, Corroyer-Dulmont A, Leblond MM, Gérault A, Toutain J, Chazaviel L, Divoux D, Petit E, MacKenzie ET, Kauffmann F, Delcroix N, Bernaudin M, Touzani O, Valable S. Carbogen-induced increases in tumor oxygenation depend on the vascular status of the tumor: A multiparametric MRI study in two rat glioblastoma models. J Cereb Blood Flow Metab 2017; 37:2270-2282. [PMID: 27496553 PMCID: PMC5464716 DOI: 10.1177/0271678x16663947] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The alleviation of hypoxia in glioblastoma with carbogen to improve treatment has met with limited success. Our hypothesis is that the eventual benefits of carbogen depend on the capacity for vasodilation. We examined, with MRI, changes in fractional cerebral blood volume, blood oxygen saturation, and blood oxygenation level dependent signals in response to carbogen. The analyses were performed in two xenograft models of glioma (U87 and U251) recognized to have different vascular patterns. Carbogen increased fractional cerebral blood volume, blood oxygen saturation, and blood oxygenation level dependent signals in contralateral tissues. In the tumor core and peritumoral regions, changes were dependent on the capacity to vasodilate rather than on resting fractional cerebral blood volume. In the highly vascularised U87 tumor, carbogen induced a greater increase in fractional cerebral blood volume and blood oxygen saturation in comparison to the less vascularized U251 tumor. The blood oxygenation level dependent signal revealed a delayed response in U251 tumors relative to the contralateral tissue. Additionally, we highlight the considerable heterogeneity of fractional cerebral blood volume, blood oxygen saturation, and blood oxygenation level dependent within U251 tumor in which multiple compartments co-exist (tumor core, rim and peritumoral regions). Finally, our study underlines the complexity of the flow/metabolism interactions in different models of glioblastoma. These irregularities should be taken into account in order to palliate intratumoral hypoxia in clinical trials.
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Affiliation(s)
- Ararat Chakhoyan
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Aurélien Corroyer-Dulmont
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Marine M Leblond
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Aurélie Gérault
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Jérôme Toutain
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Laurent Chazaviel
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France.,5 UMS3408, GIP CYCERON, Caen, France
| | - Didier Divoux
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Edwige Petit
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Eric T MacKenzie
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - François Kauffmann
- 4 Normandie Univ, Esplanade de la Paix, Caen, France.,6 UMR6139 LMNO, Avenue de Côte de Nacre, Caen, France
| | - Nicolas Delcroix
- 3 UNICAEN, GIP CYCERON, Caen, France.,5 UMS3408, GIP CYCERON, Caen, France
| | - Myriam Bernaudin
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Omar Touzani
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
| | - Samuel Valable
- 1 CNRS, UMR6301-ISTCT, CERVOxy Group, GIP CYCERON, Caen, France.,2 CEA, DSV/I2BM, GIP CYCERON, Caen, France.,3 UNICAEN, GIP CYCERON, Caen, France.,4 Normandie Univ, Esplanade de la Paix, Caen, France
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Colliez F, Gallez B, Jordan BF. Assessing Tumor Oxygenation for Predicting Outcome in Radiation Oncology: A Review of Studies Correlating Tumor Hypoxic Status and Outcome in the Preclinical and Clinical Settings. Front Oncol 2017; 7:10. [PMID: 28180110 PMCID: PMC5263142 DOI: 10.3389/fonc.2017.00010] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 01/10/2017] [Indexed: 12/30/2022] Open
Abstract
Tumor hypoxia is recognized as a limiting factor for the efficacy of radiotherapy, because it enhances tumor radioresistance. It is strongly suggested that assessing tumor oxygenation could help to predict the outcome of cancer patients undergoing radiation therapy. Strategies have also been developed to alleviate tumor hypoxia in order to radiosensitize tumors. In addition, oxygen mapping is critically needed for intensity modulated radiation therapy (IMRT), in which the most hypoxic regions require higher radiation doses and the most oxygenated regions require lower radiation doses. However, the assessment of tumor oxygenation is not yet included in day-to-day clinical practice. This is due to the lack of a method for the quantitative and non-invasive mapping of tumor oxygenation. To fully integrate tumor hypoxia parameters into effective improvements of the individually tailored radiation therapy protocols in cancer patients, methods allowing non-invasively repeated, safe, and robust mapping of changes in tissue oxygenation are required. In this review, non-invasive methods dedicated to assessing tumor oxygenation with the ultimate goal of predicting outcome in radiation oncology are presented, including positron emission tomography used with nitroimidazole tracers, magnetic resonance methods using endogenous contrasts (R1 and R2*-based methods), and electron paramagnetic resonance oximetry; the goal is to highlight results of studies establishing correlations between tumor hypoxic status and patients’ outcome in the preclinical and clinical settings.
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Affiliation(s)
- Florence Colliez
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain , Brussels , Belgium
| | - Bernard Gallez
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain , Brussels , Belgium
| | - Bénédicte F Jordan
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain , Brussels , Belgium
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Lemasson B, Pannetier N, Coquery N, Boisserand LSB, Collomb N, Schuff N, Moseley M, Zaharchuk G, Barbier EL, Christen T. MR Vascular Fingerprinting in Stroke and Brain Tumors Models. Sci Rep 2016; 6:37071. [PMID: 27883015 PMCID: PMC5121626 DOI: 10.1038/srep37071] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 10/25/2016] [Indexed: 02/08/2023] Open
Abstract
In this study, we evaluated an MRI fingerprinting approach (MRvF) designed to provide high-resolution parametric maps of the microvascular architecture (i.e., blood volume fraction, vessel diameter) and function (blood oxygenation) simultaneously. The method was tested in rats (n = 115), divided in 3 models: brain tumors (9 L, C6, F98), permanent stroke, and a control group of healthy animals. We showed that fingerprinting can robustly distinguish between healthy and pathological brain tissues with different behaviors in tumor and stroke models. In particular, fingerprinting revealed that C6 and F98 glioma models have similar signatures while 9 L present a distinct evolution. We also showed that it is possible to improve the results of MRvF and obtain supplemental information by changing the numerical representation of the vascular network. Finally, good agreement was found between MRvF and conventional MR approaches in healthy tissues and in the C6, F98, and permanent stroke models. For the 9 L glioma model, fingerprinting showed blood oxygenation measurements that contradict results obtained with a quantitative BOLD approach. In conclusion, MR vascular fingerprinting seems to be an efficient technique to study microvascular properties in vivo. Multiple technical improvements are feasible and might improve diagnosis and management of brain diseases.
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Affiliation(s)
- B Lemasson
- Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, GIN, F-38000 Grenoble, France.,Inserm, U1216, F-38000 Grenoble, France
| | - N Pannetier
- Center for Imaging of Neurodegenerative diseases, Veterans Affairs Medical Centrer, San Francisco, USA.,Department of Radiology, University of California San Francisco, San Francisco, CA, USA
| | - N Coquery
- Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, GIN, F-38000 Grenoble, France.,Inserm, U1216, F-38000 Grenoble, France
| | - Ligia S B Boisserand
- Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, GIN, F-38000 Grenoble, France.,Inserm, U1216, F-38000 Grenoble, France
| | - Nora Collomb
- Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, GIN, F-38000 Grenoble, France.,Inserm, U1216, F-38000 Grenoble, France
| | - N Schuff
- Center for Imaging of Neurodegenerative diseases, Veterans Affairs Medical Centrer, San Francisco, USA.,Department of Radiology, University of California San Francisco, San Francisco, CA, USA
| | - M Moseley
- Department of Radiology, Stanford University, Stanford, California, USA
| | - G Zaharchuk
- Department of Radiology, Stanford University, Stanford, California, USA
| | - E L Barbier
- Univ. Grenoble Alpes, Grenoble Institut des Neurosciences, GIN, F-38000 Grenoble, France.,Inserm, U1216, F-38000 Grenoble, France
| | - T Christen
- Department of Radiology, Stanford University, Stanford, California, USA
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Development of a mathematical model to estimate intra-tumor oxygen concentrations through multi-parametric imaging. Biomed Eng Online 2016; 15:114. [PMID: 27733170 PMCID: PMC5062945 DOI: 10.1186/s12938-016-0235-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Accepted: 10/04/2016] [Indexed: 01/22/2023] Open
Abstract
Background Tumor hypoxia is involved in every stage of solid tumor development: formation, progression, metastasis, and apoptosis. Two types of hypoxia exist in tumors—chronic hypoxia and acute hypoxia. Recent studies indicate that the regional hypoxia kinetics is closely linked to metastasis and therapeutic responses, but regional hypoxia kinetics is hard to measure. We propose a novel approach to determine the local pO2 by fusing the parameters obtained from in vivo functional imaging through the use of a modified multivariate Krogh model. Methods To test our idea and its potential to translate into an in vivo setting through the use of existing imaging techniques, simulation studies were performed comparing the local partial oxygen pressure (pO2) from the proposed multivariate image fusion model to the referenced pO2 derived by Green’s function, which considers the contribution from every vessel segment of an entire three-dimensional tumor vasculature to profile tumor oxygen with high spatial resolution. Results pO2 derived from our fusion approach were close to the referenced pO2 with regression slope near 1.0 and an r2 higher than 0.8 if the voxel size (or the spatial resolution set by functional imaging modality) was less than 200 μm. The simulation also showed that the metabolic rate, blood perfusion, and hemoglobin concentration were dominant factors in tissue oxygenation. The impact of the measurement error of functional imaging to the pO2 precision and accuracy was simulated. A Gaussian error function with FWHM equal to 20 % of blood perfusion or fractional vascular volume measurement contributed to average 7 % statistical error in pO2. Conclusion The simulation results indicate that the fusion of multiple parametric maps through the biophysically derived mathematical models can monitor the intra-tumor spatial variations of hypoxia in tumors with existing imaging methods, and the potential to further investigate different forms of hypoxia, such as chronic and acute hypoxia, in response to cancer therapies. Electronic supplementary material The online version of this article (doi:10.1186/s12938-016-0235-5) contains supplementary material, which is available to authorized users.
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Abstract
PURPOSE OF REVIEW This article provides an overview of the recent literature regarding the application of in-vivo brain imaging techniques to animal models of ischemic stroke. RECENT FINDINGS Major breakthroughs concerned the effects of sensory stimulation on neuronal function, local hemodynamics, and tissue outcome in the hyperacute phase of stroke; the novel application to stroke of hybrid scanners allowing simultaneous PET and magnetic resonance; the refinements of magnetic resonance-based oxygen imaging, allowing to map the ischemic penumbra in a completely noninvasive way; the implementation of new PET ligands to selectively map poststroke neuronal death and neuroinflammation; and the use of novel mesoscale imaging techniques to demonstrate the major role of interhemispheric connectivity in poststroke plasticity and functional recovery. SUMMARY The array of techniques to map in vivo the key pathophysiological brain processes involved in stroke is currently enlarging at an amazing pace. This is paralleled by ever-increasing sophistication in postprocessing tools. The combination of techniques allowing simultaneous access to several variables is particularly powerful as it affords unprecedented insights into the intimate processes underlying the tissue and neuronal changes that follow a stroke. These major leaps forward will hopefully lead to therapeutic breakthroughs aiming at improving functional outcome after stroke.
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Safronova MM, Colliez F, Magat J, Joudiou N, Jordan BF, Raftopoulos C, Gallez B, Duprez T. Mapping of global R1 and R2* values versus lipids R1 values as potential markers of hypoxia in human glial tumors: A feasibility study. Magn Reson Imaging 2016; 34:105-13. [DOI: 10.1016/j.mri.2015.10.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 09/25/2015] [Accepted: 10/25/2015] [Indexed: 01/08/2023]
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Abstract
OBJECTIVES Based on evidence supporting a potential relation between posttraumatic brain hypoxia and microcirculatory derangements with cell edema, we investigated the effects of the antiedematous agent mannitol on brain tissue oxygenation in a model of diffuse traumatic brain injury. DESIGN Experimental study. SETTING Neurosciences and physiology laboratories. SUBJECTS Adult male Wistar rats. INTERVENTIONS Thirty minutes after diffuse traumatic brain injury (impact-acceleration model), rats were IV administered with either a saline solution (traumatic brain injury-saline group) or 20% mannitol (1 g/kg) (traumatic brain injury-mannitol group). Sham-saline and sham-mannitol groups received no insult. MEASUREMENTS AND MAIN RESULTS Two series of experiments were conducted 2 hours after traumatic brain injury (or equivalent) to investigate 1) the effect of mannitol on brain edema and oxygenation, using a multiparametric magnetic resonance-based approach (n = 10 rats per group) to measure the apparent diffusion coefficient, tissue oxygen saturation, mean transit time, and blood volume fraction in the cortex and caudoputamen; 2) the effect of mannitol on brain tissue PO2 and on venous oxygen saturation of the superior sagittal sinus (n = 5 rats per group); and 3) the cortical ultrastructural changes after treatment (n = 1 per group, taken from the first experiment). Compared with the sham-saline group, the traumatic brain injury-saline group had significantly lower tissue oxygen saturation, brain tissue PO2, and venous oxygen saturation of the superior sagittal sinus values concomitant with diffuse brain edema. These effects were associated with microcirculatory collapse due to astrocyte swelling. Treatment with mannitol after traumatic brain injury reversed all these effects. In the absence of traumatic brain injury, mannitol had no effect on brain oxygenation. Mean transit time and blood volume fraction were comparable between the four groups of rats. CONCLUSION The development of posttraumatic brain edema can limit the oxygen utilization by brain tissue without evidence of brain ischemia. Our findings indicate that an antiedematous agent such as mannitol can improve brain tissue oxygenation, possibly by limiting astrocyte swelling and restoring capillary perfusion.
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Miclos S, Parasca SV, Calin MA, Savastru D, Manea D. Algorithm for mapping cutaneous tissue oxygen concentration using hyperspectral imaging. BIOMEDICAL OPTICS EXPRESS 2015; 6:3420-30. [PMID: 26417511 PMCID: PMC4574667 DOI: 10.1364/boe.6.003420] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 07/29/2015] [Accepted: 07/29/2015] [Indexed: 05/11/2023]
Abstract
The measurement of tissue oxygenation plays an important role in the diagnosis and therapeutic assessment of a large variety of diseases. Many different methods have been developed and are currently applied in clinical practice for the measurement of tissue oxygenation. Unfortunately, each of these methods has its own limitations. In this paper we proposed the use of hyperspectral imaging as new method for the assessment of the tissue oxygenation level. To extract this information from hyperspectral images a new algorithm for mapping cutaneous tissue oxygen concentration was developed. This algorithm takes into account and solves some problems related to setting and calculation of some parameters derived from hyperspectral images. The algorithm was tested with good results on synthetic images and then validated on the fingers of a hand with different blood irrigation states. The results obtained have proved the ability of hyperspectral imaging together with the developed algorithm to map the oxy- and deoxyhemoglobin distribution on the analyzed fingers. These are only preliminary results and other studies should be done before this approach to be used in the clinical setting for the diagnosis and monitoring of various diseases.
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Affiliation(s)
- Sorin Miclos
- National Institute of Research and Development for Optoelectronics – INOE 2000, Magurele, Ilfov county, RO-077125, Romania
| | | | - Mihaela Antonina Calin
- National Institute of Research and Development for Optoelectronics – INOE 2000, Magurele, Ilfov county, RO-077125, Romania
| | - Dan Savastru
- National Institute of Research and Development for Optoelectronics – INOE 2000, Magurele, Ilfov county, RO-077125, Romania
| | - Dragos Manea
- National Institute of Research and Development for Optoelectronics – INOE 2000, Magurele, Ilfov county, RO-077125, Romania
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Colliez F, Safronova MM, Magat J, Joudiou N, Peeters AP, Jordan BF, Gallez B, Duprez T. Oxygen Mapping within Healthy and Acutely Infarcted Brain Tissue in Humans Using the NMR Relaxation of Lipids: A Proof-Of-Concept Translational Study. PLoS One 2015; 10:e0135248. [PMID: 26267901 PMCID: PMC4534037 DOI: 10.1371/journal.pone.0135248] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 07/20/2015] [Indexed: 02/06/2023] Open
Abstract
The clinical applicability of brain oxygenation mapping using the MOBILE (Mapping of Oxygen By Imaging Lipids relaxation Enhancement) magnetic resonance (MR) technique was assessed in the clinical setting of normal brain and of acute cerebral ischemia as a founding proof-of-concept translational study. Changes in the oxygenation level within healthy brain tissue can be detected by analyzing the spin-lattice proton relaxation (‘Global T1’ combining water and lipid protons) because of the paramagnetic properties of molecular oxygen. It was hypothesized that selective measurement of the relaxation of the lipid protons (‘Lipids T1’) would result in enhanced sensitivity of pO2 mapping because of higher solubility of oxygen in lipids than in water, and this was demonstrated in pre-clinical models using the MOBILE technique. In the present study, 12 healthy volunteers and eight patients with acute (48–72 hours) brain infarction were examined with the same clinical 3T MR system. Both Lipids R1 (R1 = 1/T1) and Global R1 were significantly different in the infarcted area and the contralateral unaffected brain tissue, with a higher statistical significance for Lipids R1 (median difference: 0.408 s-1; p<0.0001) than for Global R1 (median difference: 0.154 s-1; p = 0.027). Both Lipids R1 and Global R1 values in the unaffected contralateral brain tissue of stroke patients were not significantly different from the R1 values calculated in the brain tissue of healthy volunteers. The main limitations of the present prototypic version of the MOBILE sequence are the long acquisition time (4 min), hampering robustness of data in uncooperative patients, and a 2 mm slice thickness precluding accurate measurements in small infarcts because of partial volume averaging effects.
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Affiliation(s)
- Florence Colliez
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain (UCL), Brussels, Belgium
| | - Marta M. Safronova
- Department of Radiology and Medical Imaging, Cliniques universitaires UCL-Saint-Luc, Brussels, Belgium
| | - Julie Magat
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain (UCL), Brussels, Belgium
| | - Nicolas Joudiou
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain (UCL), Brussels, Belgium
| | - André P. Peeters
- Department of Neurology, Cliniques universitaires UCL-Saint-Luc, Brussels, Belgium
| | - Bénédicte F. Jordan
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain (UCL), Brussels, Belgium
| | - Bernard Gallez
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain (UCL), Brussels, Belgium
| | - Thierry Duprez
- Department of Radiology and Medical Imaging, Cliniques universitaires UCL-Saint-Luc, Brussels, Belgium
- * E-mail:
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Grillon E, Farion R, Reuveni M, Glidle A, Rémy C, Coles JA. Spatial profiles of markers of glycolysis, mitochondria, and proton pumps in a rat glioma suggest coordinated programming for proliferation. BMC Res Notes 2015; 8:207. [PMID: 26032618 PMCID: PMC4467611 DOI: 10.1186/s13104-015-1191-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 05/20/2015] [Indexed: 02/07/2023] Open
Abstract
Background In cancer cells in vitro, the glycolytic pathway and the mitochondrial tricarboxylic acid (TCA) cycle are programmed to produce more precursor molecules, and relatively less ATP, than in differentiated cells. We address the questions of whether and where these changes occur in vivo in glioblastomas grown from C6 cells in rat brain. These gliomas show some spatial organization, notably in the upregulation of membrane proton transporters near the rim. Results We immunolabeled pairs of proteins (as well as DNA) on sections of rat brains containing gliomas, measured the profiles of fluorescence intensity on strips 200 µm wide and at least 3 mm long running perpendicular to the tumor rim, and expressed the intensity in the glioma relative to that outside. On averaged profiles, labeling of a marker of the glycolytic pathway, glyceraldehyde 3-phosphate dehydrogenase (GAPDH), was, as expected, greater in the glioma. Over distances up to 2.5 mm into the glioma, expression of a marker of the TCA cycle, Tom20, a pre-protein receptor on the translocation complex of the mitochondrial outer membrane, was also upregulated. The ratio of upregulation of Tom20 to upregulation of GAPDH was, on average, slightly greater than one. Near the rim (0.4–0.8 mm), GAPDH was expressed less and there was a peak in the mean ratio of 1.16, SEM = 0.001, N = 16 pairs of profiles. An antibody to V-ATPase, which, by pumping protons into vacuoles contributes to cell growth, also indicated upregulation by about 40%. When compared directly with GAPDH, upregulation of V-ATPase was only 0.764, SD = 0.016 of GAPDH upregulation. Conclusions Although there was considerable variation between individual measured profiles, on average, markers of the glycolytic pathway, of mitochondria, and of cell proliferation showed coherent upregulation in C6 gliomas. There is a zone, close to the rim, where mitochondrial presence is upregulated more than the glycolytic pathway, in agreement with earlier suggestions that lactate is taken up by cells near the rim. Electronic supplementary material The online version of this article (doi:10.1186/s13104-015-1191-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Emmanuelle Grillon
- Université Grenoble Alpes, IRMaGe, 3800, Grenoble, France. .,Inserm, US 17, 3800, Grenoble, France. .,CNRS, UMS 3552, 3800, Grenoble, France. .,CHU de Grenoble, Hopital Michallon, IRMaGe, 3800, Grenoble, France.
| | - Régine Farion
- Université Grenoble Alpes, IRMaGe, 3800, Grenoble, France. .,Inserm, US 17, 3800, Grenoble, France. .,CNRS, UMS 3552, 3800, Grenoble, France. .,CHU de Grenoble, Hopital Michallon, IRMaGe, 3800, Grenoble, France.
| | - Moshe Reuveni
- Institute of Plant Sciences, The Volcan Center, Bet Dagan, Israel.
| | - Andrew Glidle
- Department of Engineering, University of Glasgow, Glasgow, UK.
| | - Chantal Rémy
- Université Grenoble Alpes, IRMaGe, 3800, Grenoble, France. .,Inserm, U 836, 3800, Grenoble, France.
| | - Jonathan A Coles
- Institute of Infection, Immunity and Inflammation, University of Glasgow, 120 University Place, Glasgow, G12 8TA, UK.
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Caldwell M, Hapuarachchi T, Highton D, Elwell C, Smith M, Tachtsidis I. BrainSignals Revisited: Simplifying a Computational Model of Cerebral Physiology. PLoS One 2015; 10:e0126695. [PMID: 25961297 PMCID: PMC4427507 DOI: 10.1371/journal.pone.0126695] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 04/07/2015] [Indexed: 02/06/2023] Open
Abstract
Multimodal monitoring of brain state is important both for the investigation of healthy cerebral physiology and to inform clinical decision making in conditions of injury and disease. Near-infrared spectroscopy is an instrument modality that allows non-invasive measurement of several physiological variables of clinical interest, notably haemoglobin oxygenation and the redox state of the metabolic enzyme cytochrome c oxidase. Interpreting such measurements requires the integration of multiple signals from different sources to try to understand the physiological states giving rise to them. We have previously published several computational models to assist with such interpretation. Like many models in the realm of Systems Biology, these are complex and dependent on many parameters that can be difficult or impossible to measure precisely. Taking one such model, BrainSignals, as a starting point, we have developed several variant models in which specific regions of complexity are substituted with much simpler linear approximations. We demonstrate that model behaviour can be maintained whilst achieving a significant reduction in complexity, provided that the linearity assumptions hold. The simplified models have been tested for applicability with simulated data and experimental data from healthy adults undergoing a hypercapnia challenge, but relevance to different physiological and pathophysiological conditions will require specific testing. In conditions where the simplified models are applicable, their greater efficiency has potential to allow their use at the bedside to help interpret clinical data in near real-time.
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Affiliation(s)
- Matthew Caldwell
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
| | - Tharindi Hapuarachchi
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
- Centre for Mathematics and Physics in the Life Sciences and Experimental Biology, University College London, London, UK
| | - David Highton
- Neurocritical Care Unit, University College Hospitals, London, UK
| | - Clare Elwell
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
| | - Martin Smith
- Neurocritical Care Unit, University College Hospitals, London, UK
| | - Ilias Tachtsidis
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
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Ertaylan G, Okawa S, Schwamborn JC, Del Sol A. Gene regulatory network analysis reveals differences in site-specific cell fate determination in mammalian brain. Front Cell Neurosci 2014; 8:437. [PMID: 25565969 PMCID: PMC4270183 DOI: 10.3389/fncel.2014.00437] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 12/02/2014] [Indexed: 01/17/2023] Open
Abstract
Neurogenesis-the generation of new neurons-is an ongoing process that persists in the adult mammalian brain of several species, including humans. In this work we analyze two discrete brain regions: the subventricular zone (SVZ) lining the walls of the lateral ventricles; and the subgranular zone (SGZ) of the dentate gyrus (DG) of the hippocampus in mice and shed light on the SVZ and SGZ specific neurogenesis. We propose a computational model that relies on the construction and analysis of region specific gene regulatory networks (GRNs) from the publicly available data on these two regions. Using this model a number of putative factors involved in neuronal stem cell (NSC) identity and maintenance were identified. We also demonstrate potential gender and niche-derived differences based on cell surface and nuclear receptors via Ar, Hif1a, and Nr3c1. We have also conducted cell fate determinant analysis for SVZ NSC populations to Olfactory Bulb interneurons and SGZ NSC populations to the granule cells of the Granular Cell Layer. We report 31 candidate cell fate determinant gene pairs, ready to be validated. We focus on Ar-Pax6 in SVZ and Sox2-Ncor1 in SGZ. Both pairs are expressed and localized in the suggested anatomical structures as shown by in situ hybridization and found to physically interact. Finally, we conclude that there are fundamental differences between SGZ and SVZ neurogenesis. We argue that these regulatory mechanisms are linked to the observed differential neurogenic potential of these regions. The presence of nuclear and cell surface receptors in the region specific regulatory circuits indicate the significance of niche derived extracellular factors, hormones and region specific factors such as the oxygen sensitivity, dictating SGZ and SVZ specific neurogenesis.
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Affiliation(s)
- Gökhan Ertaylan
- Computational Biology, Luxembourg Centre for Systems Biomedicine, University of Luxembourg Belval, Luxembourg
| | - Satoshi Okawa
- Computational Biology, Luxembourg Centre for Systems Biomedicine, University of Luxembourg Belval, Luxembourg
| | - Jens C Schwamborn
- Developmental and Cellular Biology, Luxembourg Centre for Systems Biomedicine, University of Luxembourg Belval, Luxembourg
| | - Antonio Del Sol
- Computational Biology, Luxembourg Centre for Systems Biomedicine, University of Luxembourg Belval, Luxembourg
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Bouvier J, Detante O, Tahon F, Attye A, Perret T, Chechin D, Barbieux M, Boubagra K, Garambois K, Tropres I, Grand S, Barbier EL, Krainik A. Reduced CMRO₂ and cerebrovascular reserve in patients with severe intracranial arterial stenosis: a combined multiparametric qBOLD oxygenation and BOLD fMRI study. Hum Brain Mapp 2014; 36:695-706. [PMID: 25307948 DOI: 10.1002/hbm.22657] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 09/23/2014] [Accepted: 10/01/2014] [Indexed: 11/08/2022] Open
Abstract
Multiparametric quantitative blood oxygenation level dependent (mqBOLD) magnetic resonance Imaging (MRI) approach allows mapping tissular oxygen saturation (StO2 ) and cerebral metabolic rate of oxygen (CMRO2 ). To identify hemodynamic alteration related to severe intracranial arterial stenosis (SIAS), functional MRI of cerebrovascular reserve (CVR BOLD fMRI) to hypercapnia has been proposed. Diffusion imaging suggests chronic low grade ischemia in patients with impaired CVR. The aim of the present study was to evaluate how oxygen parameters (StO2 and CMRO2 ), assessed with mqBOLD approach, correlate with CVR in patients (n = 12) with SIAS and without arterial occlusion. The perfusion (dynamic susceptibility contrast), oxygenation, and CVR were compared. The MRI protocol conducted at 3T lasted approximately 1 h. Regions of interest measures on maps were delineated on segmented gray matter (GM) of middle cerebral artery territories. We have shown that decreased CVR is spatially associated with decreased CMRO2 in GM of patients with SIAS. Further, the degree of ipsilateral CVR reduction was well-correlated with the amplitude of the CMRO2 deficit. The altered CMRO2 suggests the presence of a moderate ischemia explained by both a decrease in perfusion and in CVR. CVR and mqBOLD method may be helpful in the selection of patients with SIAS to advocate for medical therapy or percutaneous transluminal angioplasty-stenting.
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Affiliation(s)
- Julien Bouvier
- Inserm, U836, Grenoble, France; Université Grenoble Alpes, Grenoble Institute of Neurosciences, Grenoble, France; Philips France (Healthcare Activity), Suresnes, France
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