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Marrocchio C, Humphries SM, Lynch DA. Chest Computed Tomography Findings in Unilateral Pulmonary Fibrosis Secondary to Chronic Hypoperfusion. J Thorac Imaging 2024; 39:269-274. [PMID: 38095281 DOI: 10.1097/rti.0000000000000764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
PURPOSE Unilateral lung fibrosis is uncommon and few cases secondary to parenchymal hypoperfusion have been reported, requiring further understanding of this entity. This study aims to report the chest computed tomography (CT) findings of patients with unilateral lung fibrosis related to parenchymal hypoperfusion observed in our institution. PATIENTS AND METHODS Patients with a chest CT between 2004 and 2022 showing a condition causing hypoperfusion of either lung and ipsilateral unilateral lung fibrosis were retrospectively identified. Clinical and scintigraphic data were collected. Pattern and distribution of fibrosis were recorded, and its progression was evaluated when follow-up was available. In adequate CTs, fibrosis was quantified using data-driven textural analysis (DTA). Affected and contralateral lungs and baseline and follow-up data were compared using the Wilcoxon signed-rank test. RESULTS Thirteen patients (male: 7, female: 6, median age: 61 y) were included; 5 with congenital unilateral absence of a pulmonary artery and 8 with fibrosing mediastinitis. The mean scintigraphic perfusion of affected lungs was 3.3% ± 1.1 compared with 96.7% ± 1.1 contralaterally (n = 7, P = 0.017). Fibrosis had a UIP pattern in one case, indeterminate in the others, and was most commonly diffuse craniocaudally and peripheral or central axially. DTA in 12 patients showed a mean fibrotic score of 32% ± 24.6 compared with 0.5% ± 0.4 in the contralateral lungs ( P = 0.002). Median follow-up was 4.5 years (minimum to maximum: 1 to 13 y). Of 10 patients, fibrosis was progressive in 60%. DTA of 5 follow-up CTs showed increased reticulations ( P = 0.043). CONCLUSION In patients with lung hypoperfusion, the possible complication of lung fibrosis should be considered.
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Affiliation(s)
- Cristina Marrocchio
- Department of Medicine and Surgery, Unit of Radiological Sciences, University of Parma, Parma, Italy
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Audi SH, Taheri P, Zhao M, Hu K, Jacobs ER, Clough AV. In vivo molecular imaging stratifies rats with different susceptibilities to hyperoxic acute lung injury. Am J Physiol Lung Cell Mol Physiol 2022; 323:L410-L422. [PMID: 35943727 PMCID: PMC9484995 DOI: 10.1152/ajplung.00126.2022] [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: 04/18/2022] [Revised: 06/26/2022] [Accepted: 08/05/2022] [Indexed: 11/22/2022] Open
Abstract
99mTc-hexamethylpropyleneamine oxime (HMPAO) and 99mTc-duramycin in vivo imaging detects pulmonary oxidative stress and cell death, respectively, in rats exposed to >95% O2 (hyperoxia) as a model of acute respiratory distress syndrome (ARDS). Preexposure to hyperoxia for 48 h followed by 24 h in room air (H-T) is protective against hyperoxia-induced lung injury. This study's objective was to determine the ability of 99mTc-HMPAO and 99mTc-duramycin to track this protection and to elucidate underlying mechanisms. Rats were exposed to normoxia, hyperoxia for 60 h, H-T, or H-T followed by 60 h of hyperoxia (H-T + 60). Imaging was performed 20 min after intravenous injection of either 99mTc-HMPAO or 99mTc-duramycin. 99mTc-HMPAO and 99mTc-duramycin lung uptake was 200% and 167% greater (P < 0.01) in hyperoxia compared with normoxia rats, respectively. On the other hand, uptake of 99mTc-HMPAO in H-T + 60 was 24% greater (P < 0.01) than in H-T rats, but 99mTc-duramycin uptake was not significantly different (P = 0.09). Lung wet-to-dry weight ratio, pleural effusion, endothelial filtration coefficient, and histological indices all showed evidence of protection and paralleled imaging results. Additional results indicate higher mitochondrial complex IV activity in H-T versus normoxia rats, suggesting that mitochondria of H-T lungs may be more tolerant of oxidative stress. A pattern of increasing lung uptake of 99mTc-HMPAO and 99mTc-duramycin correlates with advancing oxidative stress and cell death and worsening injury, whereas stable or decreasing 99mTc-HMPAO and stable 99mTc-duramycin reflects hyperoxia tolerance, suggesting the potential utility of molecular imaging for identifying at-risk hosts that are more or less susceptible to progressing to ARDS.
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Affiliation(s)
- Said H Audi
- Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin
- Clement J. Zablocki Veterans Administration Medical Center, Milwaukee, Wisconsin
- Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Pardis Taheri
- Department of Biomedical Engineering, Marquette University-Medical College of Wisconsin, Milwaukee, Wisconsin
- Clement J. Zablocki Veterans Administration Medical Center, Milwaukee, Wisconsin
| | - Ming Zhao
- Department of Medicine, Northwestern University, Chicago, Illinois
| | - Kurt Hu
- Clement J. Zablocki Veterans Administration Medical Center, Milwaukee, Wisconsin
- Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Elizabeth R Jacobs
- Clement J. Zablocki Veterans Administration Medical Center, Milwaukee, Wisconsin
- Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Anne V Clough
- Clement J. Zablocki Veterans Administration Medical Center, Milwaukee, Wisconsin
- Department of Mathematical and Statistical Sciences, Marquette University, Milwaukee, Wisconsin
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Audi SH, Jacobs ER, Taheri P, Ganesh S, Clough AV. Assessment of Protection Offered By the NRF2 Pathway Against Hyperoxia-Induced Acute Lung Injury in NRF2 Knockout Rats. Shock 2022; 57:274-280. [PMID: 34738958 PMCID: PMC8758548 DOI: 10.1097/shk.0000000000001882] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
ABSTRACT Nuclear factor erythroid 2-related factor (Nrf2) is a redox-sensitive transcription factor that responds to oxidative stress by activating expressions of key antioxidant and cytoprotective enzymes via the Nrf2-antioxidant response element (ARE) signaling pathway. Our objective was to characterize hyperoxia-induced acute lung injury (HALI) in Nrf2 knock-out (KO) rats to elucidate the role of this pathway in HALI. Adult Nrf2 wildtype (WT), and KO rats were exposed to room air (normoxia) or >95% O2 (hyperoxia) for 48 h, after which selected injury and functional endpoints were measured in vivo and ex vivo. Results demonstrate that the Nrf2-ARE signaling pathway provides some protection against HALI, as reflected by greater hyperoxia-induced histological injury and higher pulmonary endothelial filtration coefficient in KO versus WT rats. We observed larger hyperoxia-induced increases in lung expression of glutathione (GSH) synthetase, 3-nitrotyrosine (index of oxidative stress), and interleukin-1β, and in vivo lung uptake of the GSH-sensitive SPECT biomarker 99mTc-HMPAO in WT compared to KO rats. Hyperoxia also induced increases in lung expression of myeloperoxidase in both WT and KO rats, but with no difference between WT and KO. Hyperoxia had no effect on expression of Bcl-2 (anti-apoptotic protein) or peroxiredoxin-1. These results suggest that the protection offered by the Nrf2-ARE pathway against HALI is in part via its regulation of the GSH redox pathway. To the best of our knowledge, this is the first study to assess the role of the Nrf2-ARE signaling pathway in protection against HALI using a rat Nrf2 knockout model.
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Affiliation(s)
- Said H. Audi
- Marquette University-Medical College of Wisconsin Department of Biomedical Engineering
- Clement J. Zablocki V.A. Medical Center
| | - Elizabeth R. Jacobs
- Marquette University-Medical College of Wisconsin Department of Biomedical Engineering
- Division of Pulmonary and Critical Care Medicine, Medical College of Wisconsin
| | - Pardis Taheri
- Marquette University-Medical College of Wisconsin Department of Biomedical Engineering
- Clement J. Zablocki V.A. Medical Center
| | - Swetha Ganesh
- Marquette University-Medical College of Wisconsin Department of Biomedical Engineering
- Clement J. Zablocki V.A. Medical Center
| | - Anne V. Clough
- Clement J. Zablocki V.A. Medical Center
- Department of Mathematical and Statistical Sciences, Marquette University
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Beyer AM, Norwood Toro LE, Hughes WE, Young M, Clough AV, Gao F, Medhora M, Audi SH, Jacobs ER. Autophagy, TERT, and mitochondrial dysfunction in hyperoxia. Am J Physiol Heart Circ Physiol 2021; 321:H985-H1003. [PMID: 34559580 PMCID: PMC8616608 DOI: 10.1152/ajpheart.00166.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 08/31/2021] [Accepted: 09/16/2021] [Indexed: 02/06/2023]
Abstract
Ventilation with gases containing enhanced fractions of oxygen is the cornerstone of therapy for patients with hypoxia and acute respiratory distress syndrome. Yet, hyperoxia treatment increases free reactive oxygen species (ROS)-induced lung injury, which is reported to disrupt autophagy/mitophagy. Altered extranuclear activity of the catalytic subunit of telomerase, telomerase reverse transcriptase (TERT), plays a protective role in ROS injury and autophagy in the systemic and coronary endothelium. We investigated interactions between autophagy/mitophagy and TERT that contribute to mitochondrial dysfunction and pulmonary injury in cultured rat lung microvascular endothelial cells (RLMVECs) exposed in vitro, and rat lungs exposed in vivo to hyperoxia for 48 h. Hyperoxia-induced mitochondrial damage in rat lungs [TOMM20, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT)], which was paralleled by increased markers of inflammation [myeloperoxidase (MPO), IL-1β, TLR9], impaired autophagy signaling (Beclin-1, LC3B-II/1, and p62), and decreased the expression of TERT. Mitochondrial-specific autophagy (mitophagy) was not altered, as hyperoxia increased expression of Pink1 but not Parkin. Hyperoxia-induced mitochondrial damage (TOMM20) was more pronounced in rats that lack the catalytic subunit of TERT and resulted in a reduction in cellular proliferation rather than cell death in RLMVECs. Activation of TERT or autophagy individually offset mitochondrial damage (MTT). Combined activation/inhibition failed to alleviate hyperoxic-induced mitochondrial damage in vitro, whereas activation of autophagy in vivo decreased mitochondrial damage (MTT) in both wild type (WT) and rats lacking TERT. Functionally, activation of either TERT or autophagy preserved transendothelial membrane resistance. Altogether, these observations show that activation of autophagy/mitophagy and/or TERT mitigate loss of mitochondrial function and barrier integrity in hyperoxia.NEW & NOTEWORTHY In cultured pulmonary artery endothelial cells and in lungs exposed in vivo to hyperoxia, autophagy is activated, but clearance of autophagosomes is impaired in a manner that suggests cross talk between TERT and autophagy. Stimulation of autophagy prevents hyperoxia-induced decreases in mitochondrial metabolism and sustains monolayer resistance. Hyperoxia increases mitochondrial outer membrane (TOMM20) protein, decreases mitochondrial function, and reduces cellular proliferation without increasing cell death.
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Affiliation(s)
- Andreas M Beyer
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Laura E Norwood Toro
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - William E Hughes
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Micaela Young
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Anne V Clough
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Research Service, Zablocki Veterans Affairs Medical Center, Milwaukee Wisconsin
- Department of Mathematics, Statistics and Computer Science, Marquette University, Milwaukee, Wisconsin
| | - Feng Gao
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Meetha Medhora
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
- Research Service, Zablocki Veterans Affairs Medical Center, Milwaukee Wisconsin
| | - Said H Audi
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Research Service, Zablocki Veterans Affairs Medical Center, Milwaukee Wisconsin
- Department of Biomedical Engineering, Marquette University, Milwaukee, Wisconsin
| | - Elizabeth R Jacobs
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
- Research Service, Zablocki Veterans Affairs Medical Center, Milwaukee Wisconsin
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Protection by Inhaled Hydrogen Therapy in a Rat Model of Acute Lung Injury can be Tracked in vivo Using Molecular Imaging. Shock 2018; 48:467-476. [PMID: 28915216 DOI: 10.1097/shk.0000000000000872] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Inhaled hydrogen gas (H2) provides protection in rat models of human acute lung injury (ALI). We previously reported that biomarker imaging can detect oxidative stress and endothelial cell death in vivo in a rat model of ALI. Our objective was to evaluate the ability of Tc-hexamethylpropyleneamineoxime (HMPAO) and Tc-duramycin to track the effectiveness of H2 therapy in vivo in the hyperoxia rat model of ALI. Rats were exposed to room air (normoxia), 98% O2 + 2% N2 (hyperoxia) or 98% O2 + 2% H2 (hyperoxia+H2) for up to 60 h. In vivo scintigraphy images were acquired following injection of Tc-HMPAO or Tc-duramycin. For hyperoxia rats, Tc-HMPAO and Tc-duramycin lung uptake increased in a time-dependent manner, reaching a maximum increase of 270% and 150% at 60 h, respectively. These increases were reduced to 120% and 70%, respectively, in hyperoxia+H2 rats. Hyperoxia exposure increased glutathione content in lung homogenate (36%) more than hyperoxia+H2 (21%), consistent with increases measured in Tc-HMPAO lung uptake. In 60-h hyperoxia rats, pleural effusion, which was undetectable in normoxia rats, averaged 9.3 gram/rat, and lung tissue 3-nitrotyrosine expression increased by 790%. Increases were reduced by 69% and 59%, respectively, in 60-h hyperoxia+H2 rats. This study detects and tracks the anti-oxidant and anti-apoptotic properties of H2 therapy in vivo after as early as 24 h of hyperoxia exposure. The results suggest the potential utility of these SPECT biomarkers for in vivo assessment of key cellular pathways in the pathogenesis of ALI and for monitoring responses to therapies.
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99MTc-Hexamethylpropyleneamine Oxime Imaging for Early Detection of Acute Lung Injury in Rats Exposed to Hyperoxia or Lipopolysaccharide Treatment. Shock 2018; 46:420-30. [PMID: 26974426 DOI: 10.1097/shk.0000000000000605] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Tc-Hexamethylpropyleneamine oxime (HMPAO) is a clinical single-photon emission computed tomography biomarker of tissue oxidoreductive state. Our objective was to investigate whether HMPAO lung uptake can serve as a preclinical marker of lung injury in two well-established rat models of human acute lung injury (ALI).Rats were exposed to >95% O2 (hyperoxia) or treated with intratracheal lipopolysaccharide (LPS), with first endpoints obtained 24 h later. HMPAO was administered intravenously before and after treatment with the glutathione-depleting agent diethyl maleate (DEM), scintigraphy images were acquired, and HMPAO lung uptake was quantified from the images. We also measured breathing rates, heart rates, oxygen saturation, bronchoalveolar lavage (BAL) cell counts and protein, lung homogenate glutathione (GSH) content, and pulmonary vascular endothelial filtration coefficient (Kf).For hyperoxia rats, HMPAO lung uptake increased after 24 h (134%) and 48 h (172%) of exposure. For LPS-treated rats, HMPAO lung uptake increased (188%) 24 h after injury and fell with resolution of injury. DEM reduced HMPAO uptake in hyperoxia and LPS rats by a greater fraction than in normoxia rats. Both hyperoxia exposure (18%) and LPS treatment (26%) increased lung homogenate GSH content, which correlated strongly with HMPAO uptake. Neither of the treatments had an effect on Kf at 24 h. LPS-treated rats appeared healthy but exhibited mild tachypnea, BAL, and histological evidence of inflammation, and increased wet and dry lung weights. These results suggest the potential utility of HMPAO as a tool for detecting ALI at a phase likely to exhibit minimal clinical evidence of injury.
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Densmore JC, Schaid TR, Jeziorczak PM, Medhora M, Audi S, Nayak S, Auchampach J, Dwinell MR, Geurts AM, Jacobs ER. Lung injury pathways: Adenosine receptor 2B signaling limits development of ischemic bronchiolitis obliterans organizing pneumonia. Exp Lung Res 2017; 43:38-48. [PMID: 28266889 PMCID: PMC5831175 DOI: 10.1080/01902148.2017.1286697] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Purpose/Aim of the Study: Adenosine signaling was studied in bronchiolitis obliterans organizing pneumonia (BOOP) resulting from unilateral lung ischemia. MATERIALS AND METHODS Ischemia was achieved by either left main pulmonary artery or complete hilar ligation. Sprague-Dawley (SD) rats, Dahl salt sensitive (SS) rats and SS mutant rat strains containing a mutation in the A2B adenosine receptor gene (Adora2b) were studied. Adenosine concentrations were measured in bronchoalveolar lavage (BAL) by HPLC. A2A (A2AAR) and A2B adenosine receptor (A2BAR) mRNA and protein were quantified. RESULTS Twenty-four hours after unilateral PA ligation, BAL adenosine concentrations from ischemic lungs were increased relative to contralateral lungs in SD rats. A2BAR mRNA and protein concentrations were increased after PA ligation while miR27a, a negatively regulating microRNA, was decreased in ischemic lungs. A2AAR mRNA and protein concentrations remained unchanged following ischemia. A2BAR protein was increased in PA ligated lungs of SS rats after 7 days, and 4 h after complete hilar ligation in SD rats. SS-Adora2b mutants showed a greater extent of BOOP relative to SS rats, and greater inflammatory changes. CONCLUSION Increased A2BAR and adenosine following unilateral lung ischemia as well as more BOOP in A2BAR mutant rats implicate a protective role for A2BAR signaling in countering ischemic lung injury.
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Affiliation(s)
- John C. Densmore
- Children’s Research Institute, Milwaukee, WI
- Clinical and Translational Science Institute, Milwaukee, WI
- Medical College of Wisconsin, Milwaukee, WI
| | | | - Paul M. Jeziorczak
- Children’s Research Institute, Milwaukee, WI
- Medical College of Wisconsin, Milwaukee, WI
| | | | | | | | | | | | | | - Elizabeth R. Jacobs
- Clinical and Translational Science Institute, Milwaukee, WI
- Medical College of Wisconsin, Milwaukee, WI
- Clement J. Zablocki Veterans Affairs Medical Center, Milwaukee, WI
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Liu Q, Liu Y, Yang J, Huang X, Han K, Zhao D, Bi K, Li Y. Two Genetically Similar H9N2 Influenza A Viruses Show Different Pathogenicity in Mice. Front Microbiol 2016; 7:1737. [PMID: 27867373 PMCID: PMC5096341 DOI: 10.3389/fmicb.2016.01737] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 10/17/2016] [Indexed: 12/02/2022] Open
Abstract
H9N2 Avian influenza virus has repeatedly infected humans and other mammals, which highlights the need to determine the pathogenicity and the corresponding mechanism of this virus for mammals. In this study, we found two H9N2 viruses with similar genetic background but with different pathogenicity in mice. The A/duck/Nanjing/06/2003 (NJ06) virus was highly pathogenic for mice, with a 50% mouse lethal dose (MLD50) of 102.83 50% egg infectious dose (EID50), whereas the A/duck/Nanjing/01/1999 (NJ01) virus was low pathogenic for mice, with a MLD50 of >106.81 EID50. Further studies showed that the NJ06 virus grew faster and reached significantly higher titers than NJ01 in vivo and in vitro. Moreover, the NJ06 virus induced more severe lung lesions, and higher levels of inflammatory cellular infiltration and cytokine response in lungs than NJ01 did. However, only 12 different amino acid residues (HA-K157E, NA-A9T, NA-R435K, PB2-T149P, PB2-K627E, PB1-R187K, PA-L548M, PA-M550L, NP-G127E, NP-P277H, NP-D340N, NS1-D171N) were found between the two viruses, and all these residues except for NA-R435K were located in the known functional regions involved in interaction of viral proteins or between the virus and host factors. Summary, our results suggest that multiple amino acid differences may be responsible for the higher pathogenicity of the NJ06 virus for mice, resulting in lethal infection, enhanced viral replication, severe lung lesions, and excessive inflammatory cellular infiltration and cytokine response in lungs. These observations will be helpful for better understanding the pathogenic potential and the corresponding molecular basis of H9N2 viruses that might pose threats to human health in the future.
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Affiliation(s)
- Qingtao Liu
- Key Laboratory of Veterinary Biological Engineering and Technology, National Center for Engineering Research of Veterinary Bio-products, Institute of Veterinary Medicine, Ministry of Agriculture, Jiangsu Academy of Agricultural SciencesNanjing, China; Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and ZoonosesYangzhou, China
| | - Yuzhuo Liu
- Key Laboratory of Veterinary Biological Engineering and Technology, National Center for Engineering Research of Veterinary Bio-products, Institute of Veterinary Medicine, Ministry of Agriculture, Jiangsu Academy of Agricultural SciencesNanjing, China; Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and ZoonosesYangzhou, China
| | - Jing Yang
- Key Laboratory of Veterinary Biological Engineering and Technology, National Center for Engineering Research of Veterinary Bio-products, Institute of Veterinary Medicine, Ministry of Agriculture, Jiangsu Academy of Agricultural SciencesNanjing, China; Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and ZoonosesYangzhou, China
| | - Xinmei Huang
- Key Laboratory of Veterinary Biological Engineering and Technology, National Center for Engineering Research of Veterinary Bio-products, Institute of Veterinary Medicine, Ministry of Agriculture, Jiangsu Academy of Agricultural SciencesNanjing, China; Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and ZoonosesYangzhou, China
| | - Kaikai Han
- Key Laboratory of Veterinary Biological Engineering and Technology, National Center for Engineering Research of Veterinary Bio-products, Institute of Veterinary Medicine, Ministry of Agriculture, Jiangsu Academy of Agricultural SciencesNanjing, China; Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and ZoonosesYangzhou, China
| | - Dongmin Zhao
- Key Laboratory of Veterinary Biological Engineering and Technology, National Center for Engineering Research of Veterinary Bio-products, Institute of Veterinary Medicine, Ministry of Agriculture, Jiangsu Academy of Agricultural SciencesNanjing, China; Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and ZoonosesYangzhou, China
| | - Keran Bi
- Key Laboratory of Veterinary Biological Engineering and Technology, National Center for Engineering Research of Veterinary Bio-products, Institute of Veterinary Medicine, Ministry of Agriculture, Jiangsu Academy of Agricultural SciencesNanjing, China; Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and ZoonosesYangzhou, China
| | - Yin Li
- Key Laboratory of Veterinary Biological Engineering and Technology, National Center for Engineering Research of Veterinary Bio-products, Institute of Veterinary Medicine, Ministry of Agriculture, Jiangsu Academy of Agricultural SciencesNanjing, China; Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and ZoonosesYangzhou, China
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Dysregulation of the renin-angiotensin system during lung ischemia-reperfusion injury. Exp Lung Res 2016; 42:277-85. [DOI: 10.1080/01902148.2016.1207725] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Petitpierre N, Beigelman C, Letovanec I, Lazor R. [Cryptogenic organizing pneumonia]. Rev Mal Respir 2016; 33:703-717. [PMID: 26857200 DOI: 10.1016/j.rmr.2015.08.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Accepted: 08/21/2015] [Indexed: 01/15/2023]
Abstract
INTRODUCTION Organizing pneumonia is a particular type of inflammatory reaction of the lung which gives rise to a clinico-pathological syndrome. It is called "secondary" when a cause such as an infection, a drug toxicity, or a connective tissue disease can be identified, or "cryptogenic" when no cause is identified. The clinical picture is usually characterized by the subacute onset of fever, fatigue, cough and dyspnea, with multiple subpleural areas of consolidation on thoracic imaging. STATE OF THE ART Organizing pneumonia is characterised by the presence of buds of endoalveolar connective tissue. These result from an injury to the alveolar epithelium, followed by the deposition of fibrin in the alveolar spaces, and the migration of fibroblasts which produce a myxoid endoalveolar matrix. A remarkable feature of organizing pneumonia is the complete disappearance of these endoalveolar buds with corticosteroid treatment, in sharp contrast with what is seen in pulmonary fibrosis. The clinical response to corticosteroids is usually prompt and excellent. Relapses are frequent but usually benign. PERSPECTIVES AND CONCLUSION As the clinical, imaging and pathological characteristics of organizing pneumonia are now well established, many questions remain unanswered, such as the mechanisms involved in the complete reversibility of the pulmonary lesions, and the role of steroid-sparing treatments such as immunomodulatory macrolides.
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Affiliation(s)
- N Petitpierre
- Unité des pneumopathies interstitielles et maladies pulmonaires rares, service de pneumologie, centre hospitalier universitaire vaudois (CHUV), 46, rue du Bugnon, 1011 Lausanne, Suisse
| | - C Beigelman
- Service de radiodiagnostic et de radiologie interventionnelle, centre hospitalier universitaire vaudois (CHUV), Lausanne, Suisse
| | - I Letovanec
- Institut universitaire de pathologie, centre hospitalier universitaire vaudois (CHUV), Lausanne, Suisse
| | - R Lazor
- Unité des pneumopathies interstitielles et maladies pulmonaires rares, service de pneumologie, centre hospitalier universitaire vaudois (CHUV), 46, rue du Bugnon, 1011 Lausanne, Suisse; Centre national de référence des maladies pulmonaires rares, hôpital Louis-Pradel, hospices civils de Lyon, 69000 Lyon, France.
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What’s New in Shock? March 2013. Shock 2013; 39:227-8. [DOI: 10.1097/shk.0b013e3182898e05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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