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  1. Article ; Online: Acquiring Hyperpolarized 129Xe Magnetic Resonance Images of Lung Ventilation.

    Garrison, William J / Mugler, John P / Mata, Jaime F / Nunoo-Asare, Roselove N / Shim, Y Michael / Miller, G Wilson

    Journal of visualized experiments : JoVE

    2023  , Issue 201

    Abstract: ... ...

    Abstract Hyperpolarized
    MeSH term(s) Xenon Isotopes ; Lung/diagnostic imaging ; Lung/pathology ; Magnetic Resonance Imaging/methods ; Xenon
    Chemical Substances Xenon-129 ; Xenon Isotopes ; Xenon (3H3U766W84)
    Language English
    Publishing date 2023-11-21
    Publishing country United States
    Document type Journal Article ; Video-Audio Media
    ZDB-ID 2259946-0
    ISSN 1940-087X ; 1940-087X
    ISSN (online) 1940-087X
    ISSN 1940-087X
    DOI 10.3791/65982
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Lung Volume Dependence and Repeatability of Hyperpolarized

    Garrison, William J / Qing, Kun / He, Mu / Zhao, Li / Tustison, Nicholas J / Patrie, James T / Mata, Jaime F / Shim, Y Michael / Ropp, Alan M / Altes, Talissa A / Mugler, John P / Miller, G Wilson

    Radiology. Cardiothoracic imaging

    2023  Volume 5, Issue 3, Page(s) e220096

    Abstract: Purpose: To assess the effect of lung volume on measured values and repeatability of xenon 129 (: Materials and methods: This Health Insurance Portability and Accountability Act-compliant prospective study included data (March 2014-December 2015) ... ...

    Abstract Purpose: To assess the effect of lung volume on measured values and repeatability of xenon 129 (
    Materials and methods: This Health Insurance Portability and Accountability Act-compliant prospective study included data (March 2014-December 2015) from 49 participants (19 with COPD [mean age, 67 years ± 9 (SD)]; nine women]; 25 older healthy volunteers [mean age, 59 years ± 10; 20 women]; and five young healthy women [mean age, 23 years ± 3]). Thirty-two participants underwent repeated
    Results: Gas uptake metrics were repeatable at RV+FVC/3 (intraclass correlation coefficient = 0.88 for membrane/gas; 0.71 for RBC/gas, and 0.88 for RBC/membrane). Relative ratio changes were highly correlated with relative volume changes for membrane/gas (
    Conclusion: Dissolved-phase
    Language English
    Publishing date 2023-06-22
    Publishing country United States
    Document type Journal Article
    ISSN 2638-6135
    ISSN (online) 2638-6135
    DOI 10.1148/ryct.220096
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Highly accelerated dynamic acquisition of 3D grid-tagged hyperpolarized-gas lung images using compressed sensing.

    Garrison, William J / Qing, Kun / Tafti, Sina / Mugler, John P / Shim, Y Michael / Mata, Jaime F / Cates, Gordon D / de Lange, Eduard E / Meyer, Craig H / Cai, Jing / Miller, G Wilson

    Magnetic resonance in medicine

    2023  Volume 89, Issue 6, Page(s) 2255–2263

    Abstract: Purpose: To develop and test compressed sensing-based multiframe 3D MRI of grid-tagged hyperpolarized gas in the lung.: Theory and methods: Applying grid-tagging RF pulses to inhaled hyperpolarized gas results in images in which signal intensity is ... ...

    Abstract Purpose: To develop and test compressed sensing-based multiframe 3D MRI of grid-tagged hyperpolarized gas in the lung.
    Theory and methods: Applying grid-tagging RF pulses to inhaled hyperpolarized gas results in images in which signal intensity is predictably and sparsely distributed. In the present work, this phenomenon was used to produce a sampling pattern in which k-space is undersampled by a factor of approximately seven, yet regions of high k-space energy remain densely sampled. Three healthy subjects received multiframe 3D
    Results: Tags remained clearly resolvable for 4-6 timepoints (5-8 s) in each subject. Displacement maps revealed noteworthy temporal and spatial nonlinearities in lung motion during exhalation. Compressive normal strains occurred along all three principal directions but were primarily oriented in the head-foot direction. Fractional volume changes displayed clear bilateral symmetry, but with the lower lobes displaying slightly higher change than the upper lobes in 2 of the 3 subjects.
    Conclusion: We developed a compressed sensing-based method for multiframe 3D MRI of grid-tagged hyperpolarized gas in the lung during exhalation. This method successfully overcomes previous challenges for 3D dynamic grid-tagging, allowing time-resolved biomechanical readouts of lung function to be generated.
    MeSH term(s) Male ; Humans ; Lung/diagnostic imaging ; Respiration ; Magnetic Resonance Imaging/methods ; Data Compression
    Language English
    Publishing date 2023-01-20
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 605774-3
    ISSN 1522-2594 ; 0740-3194
    ISSN (online) 1522-2594
    ISSN 0740-3194
    DOI 10.1002/mrm.29595
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  4. Article ; Online: Emphysema Index Based on Hyperpolarized

    Tafti, Sina / Garrison, William J / Mugler, John P / Shim, Y Michael / Altes, Talissa A / Mata, Jaime F / de Lange, Eduard E / Cates, Gordon D / Ropp, Alan M / Wang, Chengbo / Miller, G Wilson

    Radiology

    2020  Volume 297, Issue 1, Page(s) 201–210

    Abstract: Background Apparent diffusion coefficient (ADC) maps of inhaled hyperpolarized gases have shown promise in the characterization of emphysema in patients with chronic obstructive pulmonary disease (COPD), yet an easily interpreted quantitative metric ... ...

    Abstract Background Apparent diffusion coefficient (ADC) maps of inhaled hyperpolarized gases have shown promise in the characterization of emphysema in patients with chronic obstructive pulmonary disease (COPD), yet an easily interpreted quantitative metric beyond mean and standard deviation has not been established. Purpose To introduce a quantitative framework with which to characterize emphysema burden based on hyperpolarized helium 3 (
    MeSH term(s) Case-Control Studies ; Diffusion Magnetic Resonance Imaging/methods ; Female ; Helium ; Humans ; Male ; Middle Aged ; Pulmonary Emphysema/diagnostic imaging ; Respiratory Function Tests ; Tomography, X-Ray Computed/methods ; Xenon Isotopes
    Chemical Substances Xenon Isotopes ; Xenon-129 ; Helium (206GF3GB41)
    Language English
    Publishing date 2020-08-11
    Publishing country United States
    Document type Comparative Study ; Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 80324-8
    ISSN 1527-1315 ; 0033-8419
    ISSN (online) 1527-1315
    ISSN 0033-8419
    DOI 10.1148/radiol.2020192804
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  5. Article ; Online: The aging immune system and its relationship to the development of chronic obstructive pulmonary disease.

    Sharma, Gulshan / Hanania, Nicola A / Shim, Y Michael

    Proceedings of the American Thoracic Society

    2009  Volume 6, Issue 7, Page(s) 573–580

    Abstract: Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory disease of the lungs that usually manifests late in life. Physiologic and immunologic changes that occur in COPD often mimic changes seen in the aging lung. This has led some to ... ...

    Abstract Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory disease of the lungs that usually manifests late in life. Physiologic and immunologic changes that occur in COPD often mimic changes seen in the aging lung. This has led some to characterize COPD as an "accelerated aging phenotype." At the molecular level, COPD and aging share common mechanisms and are associated with significant dysregulation of the immune systems. Aging and COPD are characterized by increases in proinflammatory cytokines such as interleukin (IL)-6 and tumor necrosis factor (TNF)-alpha, which are implicated in aging-related inflammatory diseases and correlate with degree of obstruction in COPD. There is an age-dependent decline in naïve T cells with oligoclonal expansion of CD8(+) CD28(null) T cells from chronic antigenic stimulation. The increase in CD8(+) CD28 (null) T regulatory cells inhibits antigen-specific CD4(+) T cell responses, leading to a decline in adaptive immune response. To compensate for the decline in the adaptive immune function there is a paradoxical up-regulation of innate immune system resulting in a proinflammatory state. The dysregulated adaptive immune system with activated innate immune responses seen with aging results in recruitment and retention of neutrophils, macrophages, and CD4(+) and CD8(+) T cells in the lungs of smokers with COPD. Once the inflammation is triggered, there is a self-perpetuating cascade of inflammation and lung parenchymal damage. This review will focus on how the aging immune system may contribute to COPD development later in life in susceptible individuals.
    MeSH term(s) Aging/immunology ; Humans ; Immunity/physiology ; Interleukin-6/physiology ; Pulmonary Disease, Chronic Obstructive/etiology ; Pulmonary Disease, Chronic Obstructive/immunology ; Tumor Necrosis Factor-alpha/physiology
    Chemical Substances Interleukin-6 ; Tumor Necrosis Factor-alpha
    Language English
    Publishing date 2009-11-24
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2132421-9
    ISSN 1943-5665 ; 1546-3222
    ISSN (online) 1943-5665
    ISSN 1546-3222
    DOI 10.1513/pats.200904-022RM
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Characterisation of gas exchange in COPD with dissolved-phase hyperpolarised xenon-129 MRI.

    Myc, Lukasz / Qing, Kun / He, Mu / Tustison, Nicholas / Lin, Zixuan / Manichaikul, Ani W / Patrie, James / Cassani, Joanne / Nunoo-Asare, Roselove N / Huang, Yong / Obaida, Zaid / Tafti, Sina / Ropp, Alan M / Miller, Grady Wilson / Mata, Jaime / Altes, Talissa / Mugler, John / Shim, Y Michael

    Thorax

    2020  Volume 76, Issue 2, Page(s) 178–181

    Abstract: To investigate whether hyperpolarised xenon-129 MRI (HXeMRI) enables regional and physiological resolution of diffusing capacity limitations in chronic obstructive pulmonary disease (COPD), we evaluated 34 COPD subjects and 11 healthy volunteers. We ... ...

    Abstract To investigate whether hyperpolarised xenon-129 MRI (HXeMRI) enables regional and physiological resolution of diffusing capacity limitations in chronic obstructive pulmonary disease (COPD), we evaluated 34 COPD subjects and 11 healthy volunteers. We report significant correlations between airflow abnormality quantified by HXeMRI and per cent predicted forced expiratory volume in 1 s; HXeMRI gas transfer capacity to red blood cells and carbon monoxide diffusion capacity (%DLCO); and HXeMRI gas transfer capacity to interstitium and per cent emphysema quantified by multidetector chest CT. We further demonstrate the capability of HXeMRI to distinguish varying pathology underlying COPD in subjects with low %DLCO and minimal emphysema.
    MeSH term(s) Aged ; Case-Control Studies ; Female ; Humans ; Magnetic Resonance Imaging/methods ; Male ; Middle Aged ; Pulmonary Disease, Chronic Obstructive/diagnostic imaging ; Pulmonary Disease, Chronic Obstructive/physiopathology ; Pulmonary Gas Exchange ; Tomography, X-Ray Computed ; Xenon Isotopes
    Chemical Substances Xenon Isotopes ; Xenon-129
    Language English
    Publishing date 2020-11-02
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 204353-1
    ISSN 1468-3296 ; 0040-6376
    ISSN (online) 1468-3296
    ISSN 0040-6376
    DOI 10.1136/thoraxjnl-2020-214924
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  7. Article ; Online: A middle rate of failed extubation is desirable?: Questions unanswered (reply).

    Kapnadak, Siddhartha G / Herndon, Steve E / Burns, Suzanne M / Shim, Y Michael / Enfield, Kyle / Brown, Cynthia / Truwit, Jonathon D / Vinayak, Ajeet G

    Journal of critical care

    2015  Volume 30, Issue 6, Page(s) 1406–1407

    MeSH term(s) Airway Extubation/statistics & numerical data ; Female ; Humans ; Intensive Care Units ; Male ; Ventilator Weaning/statistics & numerical data
    Language English
    Publishing date 2015-12
    Publishing country United States
    Document type Comment ; Letter
    ZDB-ID 632818-0
    ISSN 1557-8615 ; 0883-9441
    ISSN (online) 1557-8615
    ISSN 0883-9441
    DOI 10.1016/j.jcrc.2015.08.008
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  8. Article ; Online: Clinical outcomes associated with high, intermediate, and low rates of failed extubation in an intensive care unit.

    Kapnadak, Siddhartha G / Herndon, Steve E / Burns, Suzanne M / Shim, Y Michael / Enfield, Kyle / Brown, Cynthia / Truwit, Jonathon D / Vinayak, Ajeet G

    Journal of critical care

    2015  Volume 30, Issue 3, Page(s) 449–454

    Abstract: Purpose: Extubation failure is associated with adverse outcomes in mechanically ventilated patients, and it is believed that high rates of failed planned extubation (FPE) should be avoided. However, many believe that very low rates may also correlate ... ...

    Abstract Purpose: Extubation failure is associated with adverse outcomes in mechanically ventilated patients, and it is believed that high rates of failed planned extubation (FPE) should be avoided. However, many believe that very low rates may also correlate with adverse outcomes if resulting from overly conservative weaning practices. We examined the relationship between the percentage of FPE (%FPE) and associated outcomes, with the aim of elucidating a favorable middle range.
    Methods: A total of 1395 extubations were analyzed in mechanically ventilated subjects. Monthly %FPE values were separated into tertiles. Ventilator-free days (VFDs), intensive care unit-free days (IFDs), and mortality were compared among tertiles.
    Results: Monthly %FPE tertiles were as follows: low, less than 7%; intermediate, 7% to 15%; and high, greater than 15%. There were significant differences in VFDs and IFDs by tertile from low to high (VFDs: low, 11.8; intermediate, 12.1; high, 9.9 [P = .003]; IFDs: low, 10.5; intermediate, 10.7; high, 9.0 [P = .033]). Post hoc comparisons demonstrated significant differences between the middle and high tertiles for both VFDs and IFDs.
    Conclusions: Although exact rates may vary depending on setting, this suggests that a high %FPE (>15) should be avoided in the intensive care unit and that there may be an intermediate range where ventilator outcomes are optimized.
    MeSH term(s) Adult ; Aged ; Airway Extubation/statistics & numerical data ; Female ; Humans ; Intensive Care Units ; Male ; Middle Aged ; Respiration, Artificial ; Ventilator Weaning/statistics & numerical data
    Language English
    Publishing date 2015-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 632818-0
    ISSN 1557-8615 ; 0883-9441
    ISSN (online) 1557-8615
    ISSN 0883-9441
    DOI 10.1016/j.jcrc.2015.02.005
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  9. Article ; Online: HPLC quantification of 5-hydroxyeicosatetraenoic acid in human lung cancer tissues.

    Paige, Mikell / Saprito, Mary S / Bunyan, Dorothy A / Shim, Y Michael

    Biomedical chromatography : BMC

    2009  Volume 23, Issue 8, Page(s) 817–821

    Abstract: A simple and cost-effective HPLC method was established for quantification of 5-hydroxyeicosatetraenoic acid (5-HETE) in human lung cancer tissues. 5-HETE from 27 patients' lung cancer tissues were extracted by solid-phase extraction and analyzed on a ... ...

    Abstract A simple and cost-effective HPLC method was established for quantification of 5-hydroxyeicosatetraenoic acid (5-HETE) in human lung cancer tissues. 5-HETE from 27 patients' lung cancer tissues were extracted by solid-phase extraction and analyzed on a Waters Symmetry C(18) column (4.6 x 250 mm, 5 microm) with a mobile phase consisting of methanol, 10 mM ammonium acetate, and 1 M acetic acid (70:30:0.1, v:v:v) at a flow rate of 1.0 mL/min. The UV detection wavelength was set at 240 nm. The calibration curve was linear within the concentration range from 10 to 1000 ng/mL (r(2) > 0.999, n = 7), the limit of detection was 1.0 ng/mL and the limit of quantitation was 10.0 ng/mL for a 100 microL injection. The relative error (%) for intra-day accuracy was from 93.14 to 112.50% and the RSD (%) for intra-day precision was from 0.21 to 2.60% over the concentration range 10-1000 ng/mL. By applying this method, amounts of 5-HETE were quantitated in human lung cancer tissues from 27 human subjects. The established HPLC method was validated to be a simple, reliable and cost-effective procedure that can be applied to conduct translational characterization of 5-HETE in human lung cancer tissues.
    MeSH term(s) Chromatography, High Pressure Liquid/economics ; Chromatography, High Pressure Liquid/methods ; Humans ; Hydroxyeicosatetraenoic Acids/analysis ; Hydroxyeicosatetraenoic Acids/isolation & purification ; Linear Models ; Lung/chemistry ; Lung/pathology ; Lung Neoplasms/chemistry ; Sensitivity and Specificity ; Solid Phase Extraction/economics ; Solid Phase Extraction/methods
    Chemical Substances Hydroxyeicosatetraenoic Acids ; 5-hydroxy-6,8,11,14-eicosatetraenoic acid (467RNW8T91)
    Language English
    Publishing date 2009-04-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Validation Study
    ZDB-ID 632848-9
    ISSN 1099-0801 ; 0269-3879
    ISSN (online) 1099-0801
    ISSN 0269-3879
    DOI 10.1002/bmc.1191
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  10. Article ; Online: Role of leukotriene A4 hydrolase aminopeptidase in the pathogenesis of emphysema.

    Paige, Mikell / Wang, Kan / Burdick, Marie / Park, Sunhye / Cha, Josiah / Jeffery, Erin / Sherman, Nicholas / Shim, Y Michael

    Journal of immunology (Baltimore, Md. : 1950)

    2014  Volume 192, Issue 11, Page(s) 5059–5068

    Abstract: The leukotriene A4 hydrolase (LTA4H) is a bifunctional enzyme with epoxy hydrolase and aminopeptidase activities. We hypothesize that the LTA4H aminopeptidase activity alleviates neutrophilic inflammation, which contributes to cigarette smoke (CS)- ... ...

    Abstract The leukotriene A4 hydrolase (LTA4H) is a bifunctional enzyme with epoxy hydrolase and aminopeptidase activities. We hypothesize that the LTA4H aminopeptidase activity alleviates neutrophilic inflammation, which contributes to cigarette smoke (CS)-induced emphysema by clearing proline-glycine-proline (PGP), a triamino acid chemokine known to induce chemotaxis of neutrophils. To investigate the biological contributions made by the LTA4H aminopeptidase activity in CS-induced emphysema, we exposed wild-type mice to CS over 5 mo while treating them with a vehicle or a pharmaceutical agent (4MDM) that selectively augments the LTA4H aminopeptidase without affecting the bioproduction of leukotriene B4. Emphysematous phenotypes were assessed by premortem lung physiology with a small animal ventilator and by postmortem histologic morphometry. CS exposure acidified the airspaces and induced localization of the LTA4H protein into the nuclei of the epithelial cells. This resulted in accumulation of PGP in the airspaces by suppressing the LTA4H aminopeptidase activity. When the LTA4H aminopeptidase activity was selectively augmented by 4MDM, the levels of PGP in the bronchoalveolar lavage fluid and infiltration of neutrophils into the lungs were significantly reduced without affecting the levels of leukotriene B4. This protected murine lungs from CS-induced emphysematous alveolar remodeling. In conclusion, CS exposure promotes the development of CS-induced emphysema by suppressing the enzymatic activities of the LTA4H aminopeptidase in lung tissues and accumulating PGP and neutrophils in the airspaces. However, restoring the leukotriene A4 aminopeptidase activity with a pharmaceutical agent protected murine lungs from developing CS-induced emphysema.
    MeSH term(s) Animals ; Epoxide Hydrolases/antagonists & inhibitors ; Epoxide Hydrolases/genetics ; Epoxide Hydrolases/immunology ; Leukotriene A4/genetics ; Leukotriene A4/immunology ; Leukotriene B4/genetics ; Leukotriene B4/immunology ; Lung/immunology ; Lung/pathology ; Mice ; Mice, Knockout ; Neutrophil Infiltration ; Neutrophils/immunology ; Neutrophils/pathology ; Pulmonary Emphysema/etiology ; Pulmonary Emphysema/genetics ; Pulmonary Emphysema/immunology ; Pulmonary Emphysema/pathology ; Smoking/adverse effects ; Smoking/genetics ; Smoking/immunology
    Chemical Substances Leukotriene A4 ; Leukotriene B4 (1HGW4DR56D) ; Epoxide Hydrolases (EC 3.3.2.-) ; leukotriene A4 hydrolase (V38765PUZ6)
    Language English
    Publishing date 2014-04-25
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 3056-9
    ISSN 1550-6606 ; 0022-1767 ; 1048-3233 ; 1047-7381
    ISSN (online) 1550-6606
    ISSN 0022-1767 ; 1048-3233 ; 1047-7381
    DOI 10.4049/jimmunol.1400452
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