1
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Pak O, Nolte A, Knoepp F, Giordano L, Pecina P, Hüttemann M, Grossman LI, Weissmann N, Sommer N. Mitochondrial oxygen sensing of acute hypoxia in specialized cells - Is there a unifying mechanism? BIOCHIMICA ET BIOPHYSICA ACTA. BIOENERGETICS 2022; 1863:148911. [PMID: 35988811 DOI: 10.1016/j.bbabio.2022.148911] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 08/12/2022] [Accepted: 08/16/2022] [Indexed: 06/15/2023]
Abstract
Acclimation to acute hypoxia through cardiorespiratory responses is mediated by specialized cells in the carotid body and pulmonary vasculature to optimize systemic arterial oxygenation and thus oxygen supply to the tissues. Acute oxygen sensing by these cells triggers hyperventilation and hypoxic pulmonary vasoconstriction which limits pulmonary blood flow through areas of low alveolar oxygen content. Oxygen sensing of acute hypoxia by specialized cells thus is a fundamental pre-requisite for aerobic life and maintains systemic oxygen supply. However, the primary oxygen sensing mechanism and the question of a common mechanism in different specialized oxygen sensing cells remains unresolved. Recent studies unraveled basic oxygen sensing mechanisms involving the mitochondrial cytochrome c oxidase subunit 4 isoform 2 that is essential for the hypoxia-induced release of mitochondrial reactive oxygen species and subsequent acute hypoxic responses in both, the carotid body and pulmonary vasculature. This review compares basic mitochondrial oxygen sensing mechanisms in the pulmonary vasculature and the carotid body.
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Affiliation(s)
- Oleg Pak
- Justus Liebig University, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Anika Nolte
- Justus Liebig University, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Fenja Knoepp
- Justus Liebig University, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Luca Giordano
- Justus Liebig University, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Petr Pecina
- Laboratory of Bioenergetics, Institute of Physiology CAS, Prague, Czech Republic
| | - Maik Hüttemann
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI, USA
| | - Lawrence I Grossman
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI, USA
| | - Norbert Weissmann
- Justus Liebig University, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Natascha Sommer
- Justus Liebig University, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany.
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2
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Mitochondrial Regulation of the Hypoxia-Inducible Factor in the Development of Pulmonary Hypertension. J Clin Med 2022; 11:jcm11175219. [PMID: 36079149 PMCID: PMC9457092 DOI: 10.3390/jcm11175219] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 08/27/2022] [Accepted: 08/30/2022] [Indexed: 11/16/2022] Open
Abstract
Pulmonary hypertension (PH) is a severe progressive lung disorder characterized by pulmonary vasoconstriction and vascular remodeling, culminating in right-sided heart failure and increased mortality. Data from animal models and human subjects demonstrated that hypoxia-inducible factor (HIF)-related signaling is essential in the progression of PH. This review summarizes the regulatory pathways and mechanisms of HIF-mediated signaling, emphasizing the role of mitochondria in HIF regulation and PH pathogenesis. We also try to determine the potential to therapeutically target the components of the HIF system for the management of PH.
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3
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Bartman CM, Awari DW, Pabelick CM, Prakash YS. Intermittent Hypoxia-Hyperoxia and Oxidative Stress in Developing Human Airway Smooth Muscle. Antioxidants (Basel) 2021; 10:antiox10091400. [PMID: 34573032 PMCID: PMC8467919 DOI: 10.3390/antiox10091400] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 08/29/2021] [Accepted: 08/30/2021] [Indexed: 01/24/2023] Open
Abstract
Premature infants are frequently and intermittently administered supplemental oxygen during hypoxic episodes, resulting in cycles of intermittent hypoxia and hyperoxia. The relatively hypoxic in utero environment is important for lung development while hyperoxia during the neonatal period is recognized as detrimental towards the development of diseases such as bronchopulmonary dysplasia and bronchial asthma. Understanding early mechanisms that link hypoxic, hyperoxic, and intermittent hypoxic-hyperoxic exposures to altered airway structure and function are key to developing advanced therapeutic approaches in the clinic. Changes in oxygen availability can be detrimental to cellular function and contribute to oxidative damage. Here, we sought to determine the effect of oxygen on mitochondria in human fetal airway smooth muscle cells exposed to either 5% O2, 21% O2, 40% O2, or cycles of 5% and 40% O2 (intermittent hypoxia-hyperoxia). Reactive oxygen species production, altered mitochondrial morphology, and changes in mitochondrial respiration were assessed in the context of the antioxidant N-acetylcysteine. Our findings show developing airway smooth muscle is differentially responsive to hypoxic, hyperoxic, or intermittent hypoxic-hyperoxic exposure in terms of mitochondrial structure and function. Cycling O2 decreased mitochondrial branching and branch length similar to hypoxia and hyperoxia in the presence of antioxidants. Additionally, hypoxia decreased overall mitochondrial respiration while the addition of antioxidants increased respiration in normoxic and O2-cycling conditions. These studies show the necessity of balancing oxidative damage and antioxidant defense systems in the developing airway.
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Affiliation(s)
- Colleen M. Bartman
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN 55905, USA; (D.W.A.); (C.M.P.)
- Correspondence: (C.M.B.); (Y.S.P.)
| | - Daniel Wasim Awari
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN 55905, USA; (D.W.A.); (C.M.P.)
| | - Christina M. Pabelick
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN 55905, USA; (D.W.A.); (C.M.P.)
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN 55905, USA
| | - Y. S. Prakash
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, MN 55905, USA; (D.W.A.); (C.M.P.)
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN 55905, USA
- Correspondence: (C.M.B.); (Y.S.P.)
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4
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Kaidashev I, Shlykova O, Izmailova O, Torubara O, Yushchenko Y, Tyshkovska T, Kyslyi V, Belyaeva A, Maryniak D. Host gene variability and SARS-CoV-2 infection: A review article. Heliyon 2021; 7:e07863. [PMID: 34458641 PMCID: PMC8382593 DOI: 10.1016/j.heliyon.2021.e07863] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 06/15/2021] [Accepted: 08/19/2021] [Indexed: 02/07/2023] Open
Abstract
SARS-CoV-2 is a global threat that influenced healthcare systems around the world. This virus caused an infection in humans with different clinical signs and syndromes, severity, and mortality. The key components of the COVID-19 molecular pathogenesis are coronavirus entry and replication, antigen presentation, humoral and cellular immunity, cytokine storm, coronavirus immune evasion. The analysis of recent literature displayed possible molecular targets in the key components of the COVID-19 pathogenesis. Some of these targets might have gene polymorphisms that influenced the COVID-19 course. Unfortunately, several findings are still putative or extrapolated from SARS and MERS experimental investigations or clinical trials. We systematised original data about gene polymorphisms of possible molecular targets and associations with the COVID-19 course. Most data were obtained for angiotensin-converting enzymes 1 and 2, TMPRSS2 gene polymorphisms. Only a few results were found for gene polymorphisms of adhesion molecules, interferon system components, cytokines, and transcriptional factors, oxidative stress and metabolic molecules, as well as haemocoagulation. Understanding the host gene variability and its associations with COVID-19 can provide insights into the disease pathogenesis, individual susceptibility to SARS-CoV-2 infection, severity, complications, and mortality prognosis for the disease. Besides, these data might help in the identification of appropriate targets for intervention.
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Affiliation(s)
- I. Kaidashev
- Poltava State Medical University, Poltava, Ukraine
| | - O. Shlykova
- Poltava State Medical University, Poltava, Ukraine
| | - O. Izmailova
- Poltava State Medical University, Poltava, Ukraine
| | - O. Torubara
- Poltava State Medical University, Poltava, Ukraine
| | | | | | - V. Kyslyi
- Poltava State Medical University, Poltava, Ukraine
| | - A. Belyaeva
- Poltava State Medical University, Poltava, Ukraine
| | - D. Maryniak
- Poltava State Medical University, Poltava, Ukraine
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5
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Zhang Z, Zhang X, Bi K, He Y, Yan W, Yang CS, Zhang J. Potential protective mechanisms of green tea polyphenol EGCG against COVID-19. Trends Food Sci Technol 2021; 114:11-24. [PMID: 34054222 PMCID: PMC8146271 DOI: 10.1016/j.tifs.2021.05.023] [Citation(s) in RCA: 81] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 05/07/2021] [Accepted: 05/15/2021] [Indexed: 02/08/2023]
Abstract
Background The world is in the midst of the COVID-19 pandemic. In this comprehensive review, we discuss the potential protective effects of (−)-epigallocatechin-3-gallate (EGCG), a major constituent of green tea, against COVID-19. Scope and approach Information from literature of clinical symptoms and molecular pathology of COVID-19 as well as relevant publications in which EGCG shows potential protective activities against COVID-19 is integrated and evaluated. Key findings and conclusions EGCG, via activating Nrf2, can suppress ACE2 (a cellular receptor for SARS-CoV-2) and TMPRSS2, which mediate cell entry of the virus. Through inhibition of SARS-CoV-2 main protease, EGCG may inhibit viral reproduction. EGCG via its broad antioxidant activity may protect against SARS-CoV-2 evoked mitochondrial ROS (which promote SARS-CoV-2 replication) and against ROS burst inflicted by neutrophil extracellular traps. By suppressing ER-resident GRP78 activity and expression, EGCG can potentially inhibit SARS-CoV-2 life cycle. EGCG also shows protective effects against 1) cytokine storm-associated acute lung injury/acute respiratory distress syndrome, 2) thrombosis via suppressing tissue factors and activating platelets, 3) sepsis by inactivating redox-sensitive HMGB1, and 4) lung fibrosis through augmenting Nrf2 and suppressing NF-κB. These activities remain to be further substantiated in animals and humans. The possible concerted actions of EGCG suggest the importance of further studies on the prevention and treatment of COVID-19 in humans. These results also call for epidemiological studies on potential preventive effects of green tea drinking on COVID-19.
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Affiliation(s)
- Zhichao Zhang
- Department of Musculoskeletal Tumor, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
| | - Xiangchun Zhang
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, China
| | - Keyi Bi
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, 230036, China
| | - Yufeng He
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, 230036, China
| | - Wangjun Yan
- Department of Musculoskeletal Tumor, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
| | - Chung S Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854-8020, USA
| | - Jinsong Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, 230036, China
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6
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Roy SS, Taguchi YH. Identification of genes associated with altered gene expression and m6A profiles during hypoxia using tensor decomposition based unsupervised feature extraction. Sci Rep 2021; 11:8909. [PMID: 33903618 PMCID: PMC8076323 DOI: 10.1038/s41598-021-87779-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 04/05/2021] [Indexed: 11/09/2022] Open
Abstract
Although hypoxia is a critical factor that can drive the progression of various diseases, the mechanism underlying hypoxia itself remains unclear. Recently, m6A has been proposed as an important factor driving hypoxia. Despite successful analyses, potential genes were not selected with statistical significance but were selected based solely on fold changes. Because the number of genes is large while the number of samples is small, it was impossible to select genes using conventional feature selection methods with statistical significance. In this study, we applied the recently proposed principal component analysis (PCA), tensor decomposition (TD), and kernel tensor decomposition (KTD)-based unsupervised feature extraction (FE) to a hypoxia data set. We found that PCA, TD, and KTD-based unsupervised FE could successfully identify a limited number of genes associated with altered gene expression and m6A profiles, as well as the enrichment of hypoxia-related biological terms, with improved statistical significance.
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Affiliation(s)
- Sanjiban Sekhar Roy
- School of Computer Science and Engineering, Vellore Institute of Technology, Vellore, India
| | - Y-H Taguchi
- Department of Physics, Chuo University, Tokyo, 112-8551, Japan.
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7
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Schneider JL, Rowe JH, Garcia-de-Alba C, Kim CF, Sharpe AH, Haigis MC. The aging lung: Physiology, disease, and immunity. Cell 2021; 184:1990-2019. [PMID: 33811810 PMCID: PMC8052295 DOI: 10.1016/j.cell.2021.03.005] [Citation(s) in RCA: 163] [Impact Index Per Article: 54.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 02/01/2021] [Accepted: 03/02/2021] [Indexed: 02/07/2023]
Abstract
The population is aging at a rate never seen before in human history. As the number of elderly adults grows, it is imperative we expand our understanding of the underpinnings of aging biology. Human lungs are composed of a unique panoply of cell types that face ongoing chemical, mechanical, biological, immunological, and xenobiotic stress over a lifetime. Yet, we do not fully appreciate the mechanistic drivers of lung aging and why age increases the risk of parenchymal lung disease, fatal respiratory infection, and primary lung cancer. Here, we review the molecular and cellular aspects of lung aging, local stress response pathways, and how the aging process predisposes to the pathogenesis of pulmonary disease. We place these insights into context of the COVID-19 pandemic and discuss how innate and adaptive immunity within the lung is altered with age.
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Affiliation(s)
- Jaime L Schneider
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA; Dana Farber Cancer Institute, Boston, MA 02115, USA; Massachusetts General Hospital Cancer Center, Boston, MA 02114, USA
| | - Jared H Rowe
- Division of Hematology Boston Children's Hospital and Division of Pediatric Oncology Dana-Farber Cancer Institute, Boston, MA 02115, USA
| | - Carolina Garcia-de-Alba
- Stem Cell Program and Divisions of Hematology/Oncology and Pulmonary Medicine, Boston Children's Hospital, Boston, MA 02115, USA
| | - Carla F Kim
- Stem Cell Program and Divisions of Hematology/Oncology and Pulmonary Medicine, Boston Children's Hospital, Boston, MA 02115, USA; Department of Genetics, Harvard Medical School, Boston, MA 02115, USA; Harvard Stem Cell Institute, Cambridge, MA 02138, USA.
| | - Arlene H Sharpe
- Department of Immunology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA; Evergrande Center for Immunologic Disease, Harvard Medical School and Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115, USA.
| | - Marcia C Haigis
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA.
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8
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Sharma S, Singh Y, Sandhir R, Singh S, Ganju L, Kumar B, Varshney R. Mitochondrial DNA mutations contribute to high altitude pulmonary edema via increased oxidative stress and metabolic reprogramming during hypobaric hypoxia. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2021; 1862:148431. [PMID: 33862004 DOI: 10.1016/j.bbabio.2021.148431] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 03/27/2021] [Accepted: 04/07/2021] [Indexed: 10/21/2022]
Abstract
High altitude pulmonary edema (HAPE) is experienced by non-acclimatized sea level individuals on exposure to high altitude hypoxic conditions. Available evidence suggests that genetic factors and perturbed mitochondrial redox status may play an important role in HAPE pathophysiology. However, the precise mechanism has not been fully understood. In the present study, sequencing of mitochondrial DNA (mtDNA) from HAPE subjects and acclimatized controls was performed to identify pathogenic mutations and to determine their role in HAPE. Hypobaric hypoxia induced oxidative stress and metabolic alterations were also assessed in HAPE subjects. mtDNA copy number, mitochondrial oxidative phosphorylation (mtOXPHOS) activity, mitochondrial biogenesis were measured to determine mitochondrial functions. The data revealed that the mutations in Complex I genes affects the secondary structure of protein in HAPE subjects. Further, increased oxidative stress during hypobaric hypoxia, reduced mitochondrial biogenesis and mtOXPHOS activity induced metabolic reprogramming appears to contribute to mitochondrial dysfunctions in HAPE individuals. Haplogroup analysis suggests that mtDNA haplogroup H2a2a1 has potential contribution in the pathobiology of HAPE in lowlanders. This study also suggests contribution of altered mitochondrial functions in HAPE susceptibility.
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Affiliation(s)
- Swati Sharma
- Defence Institute of Physiology and Allied Sciences (DIPAS), Defence R&D Organization (DRDO), Lucknow Road, Timarpur, Delhi 110054, India; Department of Biochemistry, Basic Medical Sciences Block II, Panjab University, Chandigarh 160014, India
| | - Yamini Singh
- Defence Institute of Physiology and Allied Sciences (DIPAS), Defence R&D Organization (DRDO), Lucknow Road, Timarpur, Delhi 110054, India.
| | - Rajat Sandhir
- Department of Biochemistry, Basic Medical Sciences Block II, Panjab University, Chandigarh 160014, India
| | - Sayar Singh
- Defence Institute of Physiology and Allied Sciences (DIPAS), Defence R&D Organization (DRDO), Lucknow Road, Timarpur, Delhi 110054, India
| | - Lilly Ganju
- Defence Institute of Physiology and Allied Sciences (DIPAS), Defence R&D Organization (DRDO), Lucknow Road, Timarpur, Delhi 110054, India
| | - Bhuvnesh Kumar
- Defence Institute of Physiology and Allied Sciences (DIPAS), Defence R&D Organization (DRDO), Lucknow Road, Timarpur, Delhi 110054, India
| | - Rajeev Varshney
- Defence Institute of Physiology and Allied Sciences (DIPAS), Defence R&D Organization (DRDO), Lucknow Road, Timarpur, Delhi 110054, India
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9
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Jarmuszkiewicz W, Dominiak K, Galganski L, Galganska H, Kicinska A, Majerczak J, Zoladz JA. Lung mitochondria adaptation to endurance training in rats. Free Radic Biol Med 2020; 161:163-174. [PMID: 33075501 DOI: 10.1016/j.freeradbiomed.2020.10.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 10/11/2020] [Indexed: 02/08/2023]
Abstract
We elucidated the impact of eight weeks of endurance training on the oxidative metabolism of rat lungs. Adult 3.5-month-old male rats were randomly allocated to a treadmill training group or a sedentary group as control. In the lungs, endurance training raised the expression level of the oxygen sensors hypoxia inducible factor 1α (HIF1α) and lysine-specific demethylase 6A (KDM6A) as well as stimulated mitochondrial oxidative capacity and mitochondrial biogenesis, while lactate dehydrogenase activity was reduced. Endurance training enhanced antioxidant systems (the coenzyme Q content and superoxide dismutase) in lung tissue but decreased them (and uncoupling protein 2) in lung mitochondria. In the lung mitochondria of trained rats, the decreased Q content and Complex I (CI) activity and the enhanced cytochrome pathway activity (CIII + CIV) may account for the diminished Q reduction level, resulting in a general decrease in H2O2 formation by mitochondria. Endurance training enhanced oxidation of glutamate and fatty acids and caused opposite effects in functional mitochondrial properties during malate and succinate oxidation, which were related to reduced activity of CI and increased activity of CII, respectively. In addition, endurance training downregulated CI in supercomplexes and upregulated CIII in the CIII2+CIV supercomplex in the oxidative phosphorylation system. We concluded that the adaptive lung responses observed could be due to hypoxia and oxidative stress induced by strenuous endurance training.
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Affiliation(s)
- Wieslawa Jarmuszkiewicz
- Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, Poznan, Poland.
| | - Karolina Dominiak
- Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, Poznan, Poland.
| | - Lukasz Galganski
- Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, Poznan, Poland.
| | - Hanna Galganska
- Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, Poznan, Poland.
| | - Anna Kicinska
- Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, Poznan, Poland.
| | - Joanna Majerczak
- Department of Neurobiology, Faculty of Health Sciences, Poznan University of Physical Education, Poznan, Poland.
| | - Jerzy A Zoladz
- Department of Muscle Physiology, Faculty of Rehabilitation, University School of Physical Education, Krakow, Poland.
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10
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Abstract
In the following continuation article, the author will expand on how the mechanisms discussed in Part One capitalise on host characteristics to produce the organ specific damage seen in severe coronavirus disease (COVID-19), with specific reference to pulmonary and cardiac manifestations. Pneumonia is the primary manifestation of COVID-19; presentation varies from a mild, self-limiting pneumonitis to a fulminant and progressive respiratory failure. Features of disease severity tend to directly correlate with patient age, with elderly populations faring poorest. Advancing age parallels an increasingly pro-oxidative pulmonary milieu, a consequence of increasing host expression of phospholipase A2 Group IID. Virally induced expression of NADPH oxidase intensifies this pro-oxidant environment. The virus avails of the host response by exploiting caveolin-1 to assist in disabling host defenses and adopting a glycolytic metabolic pathway to self-replicate.
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11
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Jain PP, Hosokawa S, Xiong M, Babicheva A, Zhao T, Rodriguez M, Rahimi S, Pourhashemi K, Balistrieri F, Lai N, Malhotra A, Shyy JYJ, Valdez-Jasso D, Thistlethwaite PA, Makino A, Yuan JXJ. Revisiting the mechanism of hypoxic pulmonary vasoconstriction using isolated perfused/ventilated mouse lung. Pulm Circ 2020; 10:2045894020956592. [PMID: 33282184 PMCID: PMC7691930 DOI: 10.1177/2045894020956592] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 08/16/2020] [Indexed: 12/13/2022] Open
Abstract
Hypoxic Pulmonary Vasoconstriction (HPV) is an important physiological mechanism of the lungs that matches perfusion to ventilation thus maximizing O2 saturation of the venous blood within the lungs. This study emphasizes on principal pathways in the initiation and modulation of hypoxic pulmonary vasoconstriction with a primary focus on the role of Ca2+ signaling and Ca2+ influx pathways in hypoxic pulmonary vasoconstriction. We used an ex vivo model, isolated perfused/ventilated mouse lung to evaluate hypoxic pulmonary vasoconstriction. Alveolar hypoxia (utilizing a mini ventilator) rapidly and reversibly increased pulmonary arterial pressure due to hypoxic pulmonary vasoconstriction in the isolated perfused/ventilated lung. By applying specific inhibitors for different membrane receptors and ion channels through intrapulmonary perfusion solution in isolated lung, we were able to define the targeted receptors and channels that regulate hypoxic pulmonary vasoconstriction. We show that extracellular Ca2+ or Ca2+ influx through various Ca2+-permeable channels in the plasma membrane is required for hypoxic pulmonary vasoconstriction. Removal of extracellular Ca2+ abolished hypoxic pulmonary vasoconstriction, while blockade of L-type voltage-dependent Ca2+ channels (with nifedipine), non-selective cation channels (with 30 µM SKF-96365), and TRPC6/TRPV1 channels (with 1 µM SAR-7334 and 30 µM capsazepine, respectively) significantly and reversibly inhibited hypoxic pulmonary vasoconstriction. Furthermore, blockers of Ca2+-sensing receptors (by 30 µM NPS2143, an allosteric Ca2+-sensing receptors inhibitor) and Notch (by 30 µM DAPT, a γ-secretase inhibitor) also attenuated hypoxic pulmonary vasoconstriction. These data indicate that Ca2+ influx in pulmonary arterial smooth muscle cells through voltage-dependent, receptor-operated, and store-operated Ca2+ entry pathways all contribute to initiation of hypoxic pulmonary vasoconstriction. The extracellular Ca2+-mediated activation of Ca2+-sensing receptors and the cell-cell interaction via Notch ligands and receptors contribute to the regulation of hypoxic pulmonary vasoconstriction.
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Affiliation(s)
- Pritesh P. Jain
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - Susumu Hosokawa
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
- Department of Pediatrics, Tokyo Medical
and Dental University, Tokyo, Japan
| | - Mingmei Xiong
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
- Department of Critical Medicine, The
Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Aleksandra Babicheva
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - Tengteng Zhao
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - Marisela Rodriguez
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - Shamin Rahimi
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - Kiana Pourhashemi
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - Francesca Balistrieri
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - Ning Lai
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - Atul Malhotra
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
| | - John Y.-J. Shyy
- Division of Cardiovascular Medicine,
Department of Medicine, University of California, San Diego, USA
| | | | | | - Ayako Makino
- Division of Endocrinology and
Metabolism, University of California, San Diego, CA, USA
| | - Jason X.-J. Yuan
- Section of Physiology, Division of
Pulmonary, Critical Care and Sleep Medicine, University of California, San Diego,
CA, USA
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12
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Heffner K, Hizal DB, Majewska NI, Kumar S, Dhara VG, Zhu J, Bowen M, Hatton D, Yerganian G, Yerganian A, O'Meally R, Cole R, Betenbaugh M. Expanded Chinese hamster organ and cell line proteomics profiling reveals tissue-specific functionalities. Sci Rep 2020; 10:15841. [PMID: 32985598 PMCID: PMC7522264 DOI: 10.1038/s41598-020-72959-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 08/31/2020] [Indexed: 02/07/2023] Open
Abstract
Chinese hamster ovary (CHO) cells are the predominant production vehicle for biotherapeutics. Quantitative proteomics data were obtained from two CHO cell lines (CHO-S and CHO DG44) and compared with seven Chinese hamster (Cricetulus griseus) tissues (brain, heart, kidney, liver, lung, ovary and spleen) by tandem mass tag (TMT) labeling followed by mass spectrometry, providing a comprehensive hamster tissue and cell line proteomics atlas. Of the 8470 unique proteins identified, high similarity was observed between CHO-S and CHO DG44 and included increases in proteins involved in DNA replication, cell cycle, RNA processing, and chromosome processing. Alternatively, gene ontology and pathway analysis in tissues indicated increased protein intensities related to important tissue functionalities. Proteins enriched in the brain included those involved in acidic amino acid metabolism, Golgi apparatus, and ion and phospholipid transport. The lung showed enrichment in proteins involved in BCAA catabolism, ROS metabolism, vesicle trafficking, and lipid synthesis while the ovary exhibited enrichments in extracellular matrix and adhesion proteins. The heart proteome included vasoconstriction, complement activation, and lipoprotein metabolism enrichments. These detailed comparisons of CHO cell lines and hamster tissues will enhance understanding of the relationship between proteins and tissue function and pinpoint potential pathways of biotechnological relevance for future cell engineering.
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Affiliation(s)
- Kelley Heffner
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA.,AstraZeneca, Cell Culture and Fermentation Sciences, Gaithersburg, MD, USA
| | - Deniz Baycin Hizal
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Natalia I Majewska
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA.,AstraZeneca, Cell Culture and Fermentation Sciences, Gaithersburg, MD, USA
| | - Swetha Kumar
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Venkata Gayatri Dhara
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Jie Zhu
- AstraZeneca, Cell Culture and Fermentation Sciences, Gaithersburg, MD, USA
| | - Michael Bowen
- Allogene Therapeutics, Product and Process Development, South San Francisco, CA, USA
| | - Diane Hatton
- AstraZeneca, Cell Culture and Fermentation Sciences, Gaithersburg, MD, USA
| | | | | | - Robert O'Meally
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Robert Cole
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Michael Betenbaugh
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA.
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13
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YILDIZ H. Thiol/disulphide homeostasis in intensive care unit patients with sepsis and septic shock. Turk J Med Sci 2020; 50:811-816. [PMID: 32233178 PMCID: PMC7379464 DOI: 10.3906/sag-1905-148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 03/28/2020] [Indexed: 12/11/2022] Open
Abstract
Background/aim Sepsis is a condition caused by infection followed by unregulated inflammatory response which may lead to organ dysfunction. The aim of this study is to be the first in the literature and it has been designed to show the thiol/disulphide changes in patients with sepsis and septic shock and their correlation with acute phase reactants. Material and methods A total of 113 patients (septic shock 53 and sepsis 60) and 60 healthy control subjects have been enrolled in this study from the period February 2018 to 2019. The patients were divided in 2 groups: nonsurvivors (74) and survivors (39). The investigation includes measurements of native thiol, total thiol, dynamic disulphide bond, oxidized thiol ratio, reduced thiol ratio and thiol oxidation reduction ratio, erythrocyte sedimentation rate, C-reactive protein, and procalcitonin. Results The findings of this study suggest that changes in thiol levels play a role in the pathogenesis of patients with sepsis and septic shock. Conclusions Thiol/disulphide homeostasis is impaired in patients with sepsis and septic shock. Understanding the role of thiol/ disulphide homeostasis in sepsis and septic shock may provide different therapeutic intervention strategies for patients.
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Affiliation(s)
- Hamit YILDIZ
- Department of Internal Medical Sciences and Critical Care, Faculty of Medicine, Gaziantep University, GaziantepTurkey
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14
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Sommer N, Alebrahimdehkordi N, Pak O, Knoepp F, Strielkov I, Scheibe S, Dufour E, Andjelković A, Sydykov A, Saraji A, Petrovic A, Quanz K, Hecker M, Kumar M, Wahl J, Kraut S, Seeger W, Schermuly RT, Ghofrani HA, Ramser K, Braun T, Jacobs HT, Weissmann N, Szibor M. Bypassing mitochondrial complex III using alternative oxidase inhibits acute pulmonary oxygen sensing. SCIENCE ADVANCES 2020; 6:eaba0694. [PMID: 32426457 PMCID: PMC7159913 DOI: 10.1126/sciadv.aba0694] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 01/22/2020] [Indexed: 05/02/2023]
Abstract
Mitochondria play an important role in sensing both acute and chronic hypoxia in the pulmonary vasculature, but their primary oxygen-sensing mechanism and contribution to stabilization of the hypoxia-inducible factor (HIF) remains elusive. Alteration of the mitochondrial electron flux and increased superoxide release from complex III has been proposed as an essential trigger for hypoxic pulmonary vasoconstriction (HPV). We used mice expressing a tunicate alternative oxidase, AOX, which maintains electron flux when respiratory complexes III and/or IV are inhibited. Respiratory restoration by AOX prevented acute HPV and hypoxic responses of pulmonary arterial smooth muscle cells (PASMC), acute hypoxia-induced redox changes of NADH and cytochrome c, and superoxide production. In contrast, AOX did not affect the development of chronic hypoxia-induced pulmonary hypertension and HIF-1α stabilization. These results indicate that distal inhibition of the mitochondrial electron transport chain in PASMC is an essential initial step for acute but not chronic oxygen sensing.
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Affiliation(s)
- Natascha Sommer
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Nasim Alebrahimdehkordi
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Oleg Pak
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Fenja Knoepp
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Ievgen Strielkov
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Susan Scheibe
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Eric Dufour
- Faculty of Medicine and Health Technology, Tampere University, FI-33014 Tampere, Finland
| | - Ana Andjelković
- Faculty of Medicine and Health Technology, Tampere University, FI-33014 Tampere, Finland
| | - Akylbek Sydykov
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Alireza Saraji
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Aleksandar Petrovic
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Karin Quanz
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Matthias Hecker
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Manish Kumar
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Joel Wahl
- Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-97187 Luleå, Sweden
| | - Simone Kraut
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Werner Seeger
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Ralph T. Schermuly
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
| | - Hossein A. Ghofrani
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
- Department of Medicine, Imperial College London, Du Cane Road, Hammersmith Campus, London W12 0NN, UK
| | - Kerstin Ramser
- Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-97187 Luleå, Sweden
| | - Thomas Braun
- Department I, Cardiac Development and Remodelling, Max Planck Institute for Heart and Lung Research, D-61231 Bad Nauheim, Germany
| | - Howard T. Jacobs
- Faculty of Medicine and Health Technology, Tampere University, FI-33014 Tampere, Finland
| | - Norbert Weissmann
- Excellence Cluster Cardio-Pulmonary Institute (CPI), University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, D-35392 Giessen, Germany
- Corresponding author. (M.S.); (N.W.)
| | - Marten Szibor
- Faculty of Medicine and Health Technology, Tampere University, FI-33014 Tampere, Finland
- Corresponding author. (M.S.); (N.W.)
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15
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Truong L, Zheng YM, Wang YX. Mitochondrial Rieske iron-sulfur protein in pulmonary artery smooth muscle: A key primary signaling molecule in pulmonary hypertension. Arch Biochem Biophys 2020; 683:108234. [PMID: 31980131 DOI: 10.1016/j.abb.2019.108234] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Rieske iron-sulfur protein (RISP) is a catalytic subunit of the complex III in the mitochondrial electron transport chain. Studies for years have revealed that RISP is essential for the generation of intracellular reactive oxygen species (ROS) via delicate signaling pathways associated with many important molecules such as protein kinase C-ε, NADPH oxidase, and ryanodine receptors. More significantly, mitochondrial RISP-mediated ROS production has been implicated in the development of hypoxic pulmonary vasoconstriction, leading to pulmonary hypertension, right heart failure, and death. Investigations have also shown the involvement of RISP in ROS-dependent cardiac ischemic/reperfusion injuries. Further research may provide novel and valuable information that can not only enhance our understanding of the functional roles of RISP and the underlying molecular mechanisms in the pulmonary vasculature and other systems, but also elucidate whether RISP targeting can act as preventative and restorative therapies against pulmonary hypertension, cardiac diseases, and other disorders.
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Affiliation(s)
- Lillian Truong
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, 12208, USA
| | - Yun-Min Zheng
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, 12208, USA
| | - Yong-Xiao Wang
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, 12208, USA.
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16
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Rafikova O, Al Ghouleh I, Rafikov R. Focus on Early Events: Pathogenesis of Pulmonary Arterial Hypertension Development. Antioxid Redox Signal 2019; 31:933-953. [PMID: 31169021 PMCID: PMC6765063 DOI: 10.1089/ars.2018.7673] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 06/03/2019] [Accepted: 06/03/2019] [Indexed: 12/17/2022]
Abstract
Significance: Pulmonary arterial hypertension (PAH) is a progressive disease of the lung vasculature characterized by the proliferation of all vascular wall cell types, including endothelial, smooth muscle, and fibroblasts. The disease rapidly advances into a form with extensive pulmonary vascular remodeling, leading to a rapid increase in pulmonary vascular resistance, which results in right heart failure. Recent Advances: Most current research in the PAH field has been focused on the late stage of the disease, largely due to an urgent need for patient treatment options in clinics. Further, the pathobiology of PAH is multifaceted in the advanced disease, and there has been promising recent progress in identifying various pathological pathways related to the late clinical picture. Critical Issues: Early stage PAH still requires additional attention from the scientific community, and although the survival of patients with early diagnosis is comparatively higher, the disease develops in patients asymptomatically, making it difficult to identify and treat early. Future Directions: There are several reasons to focus on the early stage of PAH. First, the complexity of late stage disease, owing to multiple pathways being activated in a complex system with intra- and intercellular signaling, leads to an unclear picture of the key contributors to the pathobiology. Second, an understanding of early pathophysiological events can increase the ability to identify PAH patients earlier than what is currently possible. Third, the prompt diagnosis of PAH would allow for the therapy to start earlier, which has proved to be a more successful strategy, and it ensures better survival in PAH patients.
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Affiliation(s)
- Olga Rafikova
- Division of Endocrinology, Department of Medicine, University of Arizona, Tucson, Arizona
| | - Imad Al Ghouleh
- Heart, Lung, Blood, and Vascular Medicine Institute, Division of Cardiology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Ruslan Rafikov
- Division of Endocrinology, Department of Medicine, University of Arizona, Tucson, Arizona
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17
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Abstract
Significance: Redox homeostasis is finely tuned and governed by distinct intracellular mechanisms. The dysregulation of this either by external or internal events is a fundamental pathophysiologic base for many pulmonary diseases. Recent Advances: Based on recent discoveries, it is increasingly clear that cellular redox state and oxidation of signaling molecules are critical modulators of lung disease and represent a final common pathway that leads to poor respiratory outcomes. Critical Issues: Based on the wide variety of stimuli that alter specific redox signaling pathways, improved understanding of the disease and patient-specific alterations are needed for the development of therapeutic targets. Further Directions: For the full comprehension of redox signaling in pulmonary disease, it is essential to recognize the role of reactive oxygen intermediates in modulating biological responses. This review summarizes current knowledge of redox signaling in pulmonary development and pulmonary vascular disease.
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Affiliation(s)
- Gaston Ofman
- Redox Biology Laboratory, Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Trent E Tipple
- Redox Biology Laboratory, Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama
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18
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Tripathi A, Kumar B, Sagi SSK. Prophylactic efficacy of Quercetin in ameliorating the hypoxia induced vascular leakage in lungs of rats. PLoS One 2019; 14:e0219075. [PMID: 31251771 PMCID: PMC6599121 DOI: 10.1371/journal.pone.0219075] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 06/14/2019] [Indexed: 01/20/2023] Open
Abstract
The objective of the study was to find out the prophylactic efficacy of Quercetin in ameliorating the hypoxia induced vascular leakage in lungs of rats. Male SD rats received different doses of quercetin @ 25mg, 50mg, 100mg and 200mg/Kg BW, 1h prior to hypobaric hypoxia exposure (7,620m, for 6h). Quercetin 50 mg/kg BW supplemented orally 1h prior to hypoxia exposure was considered to be the optimum dose, due to significant reduction (p<0.001) in lung water content and lung transvascular leakage compared to control (hypoxia, 6h). Further, biochemical analysis (ROS, MDA, GSH, GPx, LDH, and albumin) and differential expressions of proteins (IKK-α/β, NFĸB, Nrf-2,TNF-α, ICAM-1, VCAM, P-selectin, Hif-1α, VEGF, TNF-α, TGF-β, INF-γ and IL-4) were determined by western blotting and ELISA. Changes in lung parenchyma were assessed by histopathology. Quercetin (50 mg/kg BW) prophylaxis under hypoxia showed significant reduction in oxidative stress (ROS and MDA), concomitant increase in antioxidants (GSH, GPx and SOD) followed by decreased LDH and albumin extravasation in BAL fluid over hypoxia. Quercetin prophylaxis significantly down regulated hypoxia induced increase in IKKα/β and NFĸB expressions leading to reduction in the levels of pro-inflammatory cytokines (TNF-α and INF-γ) followed by up regulation of anti-inflammatory cytokines (IL-4 and INF-γ) in lungs. Further, hypoxia mediated increase in HIF-1α was stabilized and VEGF levels in lungs were significantly down regulated by quercetin supplementation, leading to reduction in vascular leakage in lungs of rats under hypoxia. However, Quercetin has also enacted as Nrf-2 activator which significantly boosted up the synthesis of GSH under hypoxic condition compared to hypoxia. Histopathological observations further confirmed that quercetin preconditioning has an inhibitory effect on progression of oxidative stress and inflammation via attenuation of NFκB and stabilization HIF-1α in lungs of rats under hypoxia.These studies indicated that quercetin prophylaxis abrogates the possibility of hypobaric hypoxia induced pulmonary edema in rats.
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Affiliation(s)
- Ankit Tripathi
- Nutrition Division, Defence Institute of Physiology and Allied Sciences, Timarpur, Delhi, India
| | - Bhuvnesh Kumar
- Nutrition Division, Defence Institute of Physiology and Allied Sciences, Timarpur, Delhi, India
| | - Sarada S. K. Sagi
- Nutrition Division, Defence Institute of Physiology and Allied Sciences, Timarpur, Delhi, India
- * E-mail:
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19
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Truong L, Zheng YM, Wang YX. Mitochondrial Rieske iron-sulfur protein in pulmonary artery smooth muscle: A key primary signaling molecule in pulmonary hypertension. Arch Biochem Biophys 2019; 664:68-75. [PMID: 30710505 DOI: 10.1016/j.abb.2019.01.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 01/14/2019] [Accepted: 01/26/2019] [Indexed: 12/17/2022]
Abstract
Rieske iron-sulfur protein (RISP) is a catalytic subunit of the complex III in the mitochondrial electron transport chain. Studies for years have revealed that RISP is essential for the generation of intracellular reactive oxygen species (ROS) via delicate signaling pathways associated with many important molecules such as protein kinase C-ε, NADPH oxidase, and ryanodine receptors. More significantly, mitochondrial RISP-mediated ROS production has been implicated in the development of hypoxic pulmonary vasoconstriction, leading to pulmonary hypertension, right heart failure, and death. Investigations have also shown the involvement of RISP in ROS-dependent cardiac ischemic/reperfusion injuries. Further research may provide novel and valuable information that can not only enhance our understanding of the functional roles of RISP and the underlying molecular mechanisms in the pulmonary vasculature and other systems, but also elucidate whether RISP targeting can act as preventative and restorative therapies against pulmonary hypertension, cardiac diseases, and other disorders.
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Affiliation(s)
- Lillian Truong
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, 12208, USA
| | - Yun-Min Zheng
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, 12208, USA
| | - Yong-Xiao Wang
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, 12208, USA.
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20
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Boulet LM, Teppema LJ, Hackett HK, Dominelli PB, Cheyne WS, Dominelli GS, Irwin DC, Buehler PW, Baek JH, Swenson ER, Foster GE. Attenuation of human hypoxic pulmonary vasoconstriction by acetazolamide and methazolamide. J Appl Physiol (1985) 2018; 125:1795-1803. [PMID: 30236048 DOI: 10.1152/japplphysiol.00509.2018] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
RATIONALE Acetazolamide, a carbonic anhydrase inhibitor used for preventing altitude illness attenuates hypoxic pulmonary vasoconstriction (HPV) while improving oxygenation. Methazolamide, an analog of acetazolamide, is more lipophilic, has a longer half-life, and activates a major antioxidant transcription factor. However, its influence on the hypoxic pulmonary response in humans is unknown. OBJECTIVE To determine if a clinically relevant dosing of methazolamide improves oxygenation, attenuates HPV and augments plasma antioxidant capacity in men exposed to hypoxia when compared to an established dosing of acetazolamide known to suppress HPV. METHODS In this double-blind, placebo-controlled, cross-over trial, eleven participants were randomized to treatments with methazolamide (100mg b.i.d.) and acetazolamide (250mg t.i.d.) for two days prior to 60 minutes of hypoxia (FIO2≈0.12). MEASUREMENTS Pulmonary artery systolic pressure (PASP), alveolar ventilation (V̇A), blood gases and markers of redox status were measured. Pulmonary vascular sensitivity to hypoxia was determined by indexing PASP to alveolar PO2. RESULTS Acetazolamide caused greater metabolic acidosis compared with methazolamide, but the augmented V̇A and improved oxygenation with hypoxia were similar. The rise in PASP with hypoxia was lower with methazolamide (9.0 ± 0.9 mmHg) and acetazolamide (8.0 ± 0.7 mmHg) compared with placebo (14.1 ± 1.3 mmHg; P < 0.05). The pulmonary vascular sensitivity to hypoxia (ΔPASP/ΔPAO2) was reduced equally by both drugs. Only acetazolamide improved the non-enzymatic plasma antioxidant capacity. CONCLUSIONS Although acetazolamide only had plasma antioxidant properties, methazolamide led to similar improvements in oxygenation and reduction in HPV at a dose causing less metabolic acidosis than acetazolamide in humans.
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Affiliation(s)
| | - Luc J Teppema
- Anesthesiology, Leiden University Medical Center, Netherlands
| | - Heather K Hackett
- School of Health and Exercise Sciences, University of British Columbia
| | | | | | | | - David C Irwin
- Division of Cardiovascular Pulmonary Research, University of Colorado Denver Health Sciences Center, United States
| | | | | | | | - Glen Edward Foster
- School of Health and Exercise Science, University of British Columbia, Canada
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21
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Ducsay CA, Goyal R, Pearce WJ, Wilson S, Hu XQ, Zhang L. Gestational Hypoxia and Developmental Plasticity. Physiol Rev 2018; 98:1241-1334. [PMID: 29717932 PMCID: PMC6088145 DOI: 10.1152/physrev.00043.2017] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Hypoxia is one of the most common and severe challenges to the maintenance of homeostasis. Oxygen sensing is a property of all tissues, and the response to hypoxia is multidimensional involving complicated intracellular networks concerned with the transduction of hypoxia-induced responses. Of all the stresses to which the fetus and newborn infant are subjected, perhaps the most important and clinically relevant is that of hypoxia. Hypoxia during gestation impacts both the mother and fetal development through interactions with an individual's genetic traits acquired over multiple generations by natural selection and changes in gene expression patterns by altering the epigenetic code. Changes in the epigenome determine "genomic plasticity," i.e., the ability of genes to be differentially expressed according to environmental cues. The genomic plasticity defined by epigenomic mechanisms including DNA methylation, histone modifications, and noncoding RNAs during development is the mechanistic substrate for phenotypic programming that determines physiological response and risk for healthy or deleterious outcomes. This review explores the impact of gestational hypoxia on maternal health and fetal development, and epigenetic mechanisms of developmental plasticity with emphasis on the uteroplacental circulation, heart development, cerebral circulation, pulmonary development, and the hypothalamic-pituitary-adrenal axis and adipose tissue. The complex molecular and epigenetic interactions that may impact an individual's physiology and developmental programming of health and disease later in life are discussed.
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Affiliation(s)
- Charles A. Ducsay
- The Lawrence D. Longo, MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, California
| | - Ravi Goyal
- The Lawrence D. Longo, MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, California
| | - William J. Pearce
- The Lawrence D. Longo, MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, California
| | - Sean Wilson
- The Lawrence D. Longo, MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, California
| | - Xiang-Qun Hu
- The Lawrence D. Longo, MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, California
| | - Lubo Zhang
- The Lawrence D. Longo, MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, California
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22
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Pak O, Scheibe S, Esfandiary A, Gierhardt M, Sydykov A, Logan A, Fysikopoulos A, Veit F, Hecker M, Kroschel F, Quanz K, Erb A, Schäfer K, Fassbinder M, Alebrahimdehkordi N, Ghofrani HA, Schermuly RT, Brandes RP, Seeger W, Murphy MP, Weissmann N, Sommer N. Impact of the mitochondria-targeted antioxidant MitoQ on hypoxia-induced pulmonary hypertension. Eur Respir J 2018; 51:1701024. [PMID: 29419444 DOI: 10.1183/13993003.01024-2017] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Increased mitochondrial reactive oxygen species (ROS), particularly superoxide have been suggested to mediate hypoxic pulmonary vasoconstriction (HPV), chronic hypoxia-induced pulmonary hypertension (PH) and right ventricular (RV) remodelling.We determined ROS in acute, chronic hypoxia and investigated the effect of the mitochondria-targeted antioxidant MitoQ under these conditions.The effect of MitoQ or its inactive carrier substance, decyltriphenylphosphonium (TPP+), on acute HPV (1% O2 for 10 minutes) was investigated in isolated blood-free perfused mouse lungs. Mice exposed for 4 weeks to chronic hypoxia (10% O2) or after banding of the main pulmonary artery (PAB) were treated with MitoQ or TPP+ (50 mg/kg/day).Total cellular superoxide and mitochondrial ROS levels were increased in pulmonary artery smooth muscle cells (PASMC), but decreased in pulmonary fibroblasts in acute hypoxia. MitoQ significantly inhibited HPV and acute hypoxia-induced rise in superoxide concentration. ROS was decreased in PASMC, while it increased in the RV after chronic hypoxia. Correspondingly, MitoQ did not affect the development of chronic hypoxia-induced PH, but attenuated RV remodelling after chronic hypoxia as well as after PAB.Increased mitochondrial ROS of PASMC mediate acute HPV, but not chronic hypoxia-induced PH. MitoQ may be beneficial under conditions of exaggerated acute HPV.
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Affiliation(s)
- Oleg Pak
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Susan Scheibe
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Azadeh Esfandiary
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Mareike Gierhardt
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Akylbek Sydykov
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Angela Logan
- MRC Mitochondrial Biology Unit, CB2 0XY Cambridge, United Kingdom
| | - Athanasios Fysikopoulos
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Florian Veit
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Matthias Hecker
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Florian Kroschel
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Karin Quanz
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Alexandra Erb
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Katharina Schäfer
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Mirja Fassbinder
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Nasim Alebrahimdehkordi
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Hossein A Ghofrani
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Ralph T Schermuly
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Ralf P Brandes
- Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner site RheinMain, 60590 Frankfurt am Main, Germany
| | - Werner Seeger
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
- Max Planck Institute for Heart and Lung Research, 61231 Bad Nauheim, Germany
| | - Michael P Murphy
- MRC Mitochondrial Biology Unit, CB2 0XY Cambridge, United Kingdom
| | - Norbert Weissmann
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
| | - Natascha Sommer
- Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), member of the German Center for Lung Research (DZL), Justus-Liebig-University, 35392 Giessen, Germany
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23
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Bernard O, Jeny F, Uzunhan Y, Dondi E, Terfous R, Label R, Sutton A, Larghero J, Vanneaux V, Nunes H, Boncoeur E, Planès C, Dard N. Mesenchymal stem cells reduce hypoxia-induced apoptosis in alveolar epithelial cells by modulating HIF and ROS hypoxic signaling. Am J Physiol Lung Cell Mol Physiol 2017; 314:L360-L371. [PMID: 29167125 DOI: 10.1152/ajplung.00153.2017] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Distal lung diseases, such as pulmonary fibrosis or acute lung injury, are commonly associated with local alveolar hypoxia that may be deleterious through the stimulation of alveolar epithelial cell (AEC) apoptosis. In various murine models of alveolar injury, administration of allogenic human mesenchymal stem cells (hMSCs) exerts an overall protective paracrine effect, limiting lung inflammation and fibrosis. However, the precise mechanisms on lung cells themselves remain poorly understood. Here, we investigated whether hMSC-conditioned medium (hMSC-CM) would protect AECs from hypoxia-induced apoptosis and explored the mechanisms involved in this cytoprotective effect. Exposure of rat primary AECs to hypoxia (1.5% O2 for 24 h) resulted in hypoxia-inducible factor (HIF)-1α protein stabilization, partly dependent on reactive oxygen species (ROS) accumulation, and in a twofold increase in AEC apoptosis that was prevented by the HIF inhibitor 3-(5'-hydroxymethyl-2'-furyl)-1-benzyl-indazole and the antioxidant drug N-acetyl cysteine. Incubation of AECs with hMSC-CM significantly reduced hypoxia-induced apoptosis. hMSC-CM decreased HIF-1α protein expression, as well as ROS accumulation through an increase in antioxidant enzyme activities. Expression of Bnip3 and CHOP, two proapoptotic targets of HIF-1α and ROS pathways, respectively, was suppressed by hMSC-CM, while Bcl-2 expression was restored. The paracrine protective effect of hMSC was partly dependent on keratinocyte growth factor and hepatocyte growth factor secretion, preventing ROS and HIF-1α accumulation.
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Affiliation(s)
- Olivier Bernard
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France
| | - Florence Jeny
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France.,Assistance publique-Hôpitaux de Paris, Hôpital Avicenne, Bobigny, France
| | - Yurdagül Uzunhan
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France.,Assistance publique-Hôpitaux de Paris, Hôpital Avicenne, Bobigny, France
| | - Elisabetta Dondi
- Institut National de la Santé et de la Recherche Médicale, UMR 978, Bobigny, France
| | - Rahma Terfous
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France
| | - Rabab Label
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France
| | - Angela Sutton
- Institut National de la Santé et de la Recherche Médicale, UMR 1148, Laboratory for Vascular Translational Science, UFR Santé Médecine et Biologie Humaine, Université Paris 13, Sorbonne Paris Cité, Groupe Biothérapies et Glycoconjugués, Bobigny, France
| | - Jérôme Larghero
- AP-HP, Hôpital Saint Louis, Unité de Thérapie Cellulaire et Centre d'Investigation Clinique de Biothérapies, Paris, France, Université Paris Diderot, Sorbonne Paris Cité, Paris , France
| | - Valérie Vanneaux
- AP-HP, Hôpital Saint Louis, Unité de Thérapie Cellulaire et Centre d'Investigation Clinique de Biothérapies, Paris, France, Université Paris Diderot, Sorbonne Paris Cité, Paris , France
| | - Hilario Nunes
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France.,Assistance publique-Hôpitaux de Paris, Hôpital Avicenne, Bobigny, France
| | - Emilie Boncoeur
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France
| | - Carole Planès
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France.,Assistance publique-Hôpitaux de Paris, Hôpital Avicenne, Bobigny, France
| | - Nicolas Dard
- Université Paris 13, Sorbonne Paris Cité, Laboratoire Hypoxie & Poumon, EA 2363, Bobigny, France
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24
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Strielkov I, Pak O, Sommer N, Weissmann N. Recent advances in oxygen sensing and signal transduction in hypoxic pulmonary vasoconstriction. J Appl Physiol (1985) 2017; 123:1647-1656. [PMID: 28751366 DOI: 10.1152/japplphysiol.00103.2017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Hypoxic pulmonary vasoconstriction (HPV) is a physiological reaction, which adapts lung perfusion to regional ventilation and optimizes gas exchange. Impaired HPV may cause systemic hypoxemia, while generalized HPV contributes to the development of pulmonary hypertension. The triggering mechanisms underlying HPV are still not fully elucidated. Several hypotheses are currently under debate, including a possible decrease as well as an increase in reactive oxygen species as a triggering event. Recent findings suggest an increase in the production of reactive oxygen species in pulmonary artery smooth muscle cells by complex III of the mitochondrial electron transport chain and occurrence of oxygen sensing at complex IV. Other essential components are voltage-dependent potassium and possibly L-type, transient receptor potential channel 6, and transient receptor potential vanilloid 4 channels. The release of arachidonic acid metabolites appears also to be involved in HPV regulation. Further investigation of the HPV mechanisms will facilitate the development of novel therapeutic strategies for the treatment of HPV-related disorders.
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Affiliation(s)
- Ievgen Strielkov
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen , Germany
| | - Oleg Pak
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen , Germany
| | - Natasha Sommer
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen , Germany
| | - Norbert Weissmann
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen , Germany
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25
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Janocha AJ, Comhair SAA, Basnyat B, Neupane M, Gebremedhin A, Khan A, Ricci KS, Zhang R, Erzurum SC, Beall CM. Antioxidant defense and oxidative damage vary widely among high-altitude residents. Am J Hum Biol 2017; 29. [PMID: 28726295 DOI: 10.1002/ajhb.23039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 04/13/2017] [Accepted: 06/20/2017] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVES People living at high altitude experience unavoidable low oxygen levels (hypoxia). While acute hypoxia causes an increase in oxidative stress and damage despite higher antioxidant activity, the consequences of chronic hypoxia are poorly understood. The aim of the present study is to assess antioxidant activity and oxidative damage in high-altitude natives and upward migrants. METHODS Individuals from two indigenous high-altitude populations (Amhara, n = 39), (Sherpa, n = 34), one multigenerational high-altitude population (Oromo, n = 42), one upward migrant population (Nepali, n = 12), and two low-altitude reference populations (Amhara, n = 29; Oromo, n = 18) provided plasma for measurement of superoxide dismutase (SOD) activity as a marker of antioxidant capacity, and urine for measurement of 8-hydroxy-2'-deoxyguanosine (8-OHdG) as a marker of DNA oxidative damage. RESULTS High-altitude Amhara and Sherpa had the highest SOD activity, while highland Oromo and Nepalis had the lowest among high-altitude populations. High-altitude Amhara had the lowest DNA damage, Sherpa intermediate levels, and high-altitude Oromo had the highest. CONCLUSIONS High-altitude residence alone does not associate with high antioxidant defenses; residence length appears to be influential. The single-generation upward migrant sample had the lowest defense and nearly the highest DNA damage. The two high-altitude resident samples with millennia of residence had higher defenses than the two with multiple or single generations of residence.
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Affiliation(s)
- Allison J Janocha
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, 44195
| | - Suzy A A Comhair
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, 44195
| | - Buddha Basnyat
- Oxford University Clinical Research Unit-Nepal, Kathmandu, Nepal
| | | | - Amha Gebremedhin
- Department of Internal Medicine, Addis Ababa University, Addis Ababa, Ethiopia
| | - Anam Khan
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, 44195
| | - Kristin S Ricci
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, 44195
| | - Renliang Zhang
- Research Core Services, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, 44195
| | - Serpil C Erzurum
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, 44195.,Respiratory Institute, Cleveland Clinic, Cleveland, Ohio, 44195
| | - Cynthia M Beall
- Department of Anthropology, Case Western Reserve University, Cleveland, Ohio, 44106
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26
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Sommer N, Hüttemann M, Pak O, Scheibe S, Knoepp F, Sinkler C, Malczyk M, Gierhardt M, Esfandiary A, Kraut S, Jonas F, Veith C, Aras S, Sydykov A, Alebrahimdehkordi N, Giehl K, Hecker M, Brandes RP, Seeger W, Grimminger F, Ghofrani HA, Schermuly RT, Grossman LI, Weissmann N. Mitochondrial Complex IV Subunit 4 Isoform 2 Is Essential for Acute Pulmonary Oxygen Sensing. Circ Res 2017; 121:424-438. [PMID: 28620066 DOI: 10.1161/circresaha.116.310482] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 12/14/2016] [Accepted: 06/14/2017] [Indexed: 12/17/2022]
Abstract
RATIONALE Acute pulmonary oxygen sensing is essential to avoid life-threatening hypoxemia via hypoxic pulmonary vasoconstriction (HPV) which matches perfusion to ventilation. Hypoxia-induced mitochondrial superoxide release has been suggested as a critical step in the signaling pathway underlying HPV. However, the identity of the primary oxygen sensor and the mechanism of superoxide release in acute hypoxia, as well as its relevance for chronic pulmonary oxygen sensing, remain unresolved. OBJECTIVES To investigate the role of the pulmonary-specific isoform 2 of subunit 4 of the mitochondrial complex IV (Cox4i2) and the subsequent mediators superoxide and hydrogen peroxide for pulmonary oxygen sensing and signaling. METHODS AND RESULTS Isolated ventilated and perfused lungs from Cox4i2-/- mice lacked acute HPV. In parallel, pulmonary arterial smooth muscle cells (PASMCs) from Cox4i2-/- mice showed no hypoxia-induced increase of intracellular calcium. Hypoxia-induced superoxide release which was detected by electron spin resonance spectroscopy in wild-type PASMCs was absent in Cox4i2-/- PASMCs and was dependent on cysteine residues of Cox4i2. HPV could be inhibited by mitochondrial superoxide inhibitors proving the functional relevance of superoxide release for HPV. Mitochondrial hyperpolarization, which can promote mitochondrial superoxide release, was detected during acute hypoxia in wild-type but not Cox4i2-/- PASMCs. Downstream signaling determined by patch-clamp measurements showed decreased hypoxia-induced cellular membrane depolarization in Cox4i2-/- PASMCs compared with wild-type PASMCs, which could be normalized by the application of hydrogen peroxide. In contrast, chronic hypoxia-induced pulmonary hypertension and pulmonary vascular remodeling were not or only slightly affected by Cox4i2 deficiency, respectively. CONCLUSIONS Cox4i2 is essential for acute but not chronic pulmonary oxygen sensing by triggering mitochondrial hyperpolarization and release of mitochondrial superoxide which, after conversion to hydrogen peroxide, contributes to cellular membrane depolarization and HPV. These findings provide a new model for oxygen-sensing processes in the lung and possibly also in other organs.
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Affiliation(s)
- Natascha Sommer
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Maik Hüttemann
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Oleg Pak
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Susan Scheibe
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Fenja Knoepp
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Christopher Sinkler
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Monika Malczyk
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Mareike Gierhardt
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Azadeh Esfandiary
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Simone Kraut
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Felix Jonas
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Christine Veith
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Siddhesh Aras
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Akylbek Sydykov
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Nasim Alebrahimdehkordi
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Klaudia Giehl
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Matthias Hecker
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Ralf P Brandes
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Werner Seeger
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Friedrich Grimminger
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Hossein A Ghofrani
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Ralph T Schermuly
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Lawrence I Grossman
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.).
| | - Norbert Weissmann
- From the Excellence Cluster Cardiopulmonary System, University of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany (N.S., O.P., S.S., F.K., M.M., M.G., A.E., S.K., F.J., C.V., A.S., N.A., K.G., M.H., W.S., F.G., H.A.G., R.T.S., N.W.); Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI (M.H., C.S., S.A., L.I.G.); Institut für Kardiovaskuläre Physiologie, Goethe-Universität, German Center for Cardiovascular Research (DZHK), Partner Site RheinMain, Frankfurt am Main, Germany (R.P.B.); and Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
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27
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Wang L, Zheng Q, Yuan Y, Li Y, Gong X. Effects of 17β-estradiol and 2-methoxyestradiol on the oxidative stress-hypoxia inducible factor-1 pathway in hypoxic pulmonary hypertensive rats. Exp Ther Med 2017; 13:2537-2543. [PMID: 28565876 DOI: 10.3892/etm.2017.4243] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 11/25/2016] [Indexed: 12/12/2022] Open
Abstract
The present study aimed to investigate the effects of 17β-estradiol (E2) and 2-methoxyestradiol (2ME) on the oxidative stress-hypoxia inducible factor-1 (OS-HIF-1) pathway in hypoxic pulmonary hypertensive rats. Female Sprague-Dawley rats were divided randomly into 4 groups, as follows: i) Control (Group A); ii) ovariectomy (OVX) + hypoxia (Group B); iii) OVX + hypoxia + E2 injection (Group C); and iv) 2ME injection (Group D). The rats were maintained under hypoxic conditions for 8 weeks, and mean pulmonary artery pressure (mPAP) and pulmonary arteriole morphology were measured. The reactive oxygen species, superoxide dismutase (SOD), manganese superoxide dismutase (MnSOD), and copper-zinc superoxide dismutase (Cu/ZnSOD) levels in serum were also measured. MnSOD and HIF-1α expression levels in lung tissue were determined by western blotting and reverse transcription-quantitative polymerase chain reaction. The mPAP and arterial remodeling index were significantly elevated following chronic hypoxia exposure; however, experimental data revealed a reduced response in E2 and 2ME intervention rats. Compared with Group A, Group B had significantly elevated oxidative stress levels, as illustrated by increased serum ROS levels, decreased serum SOD and MnSOD levels and decreased MnSOD mRNA and protein expression levels in lung tissue. Furthermore, HIF-1α mRNA and protein expression in Group B was significantly elevated compared with Group A. E2 and 2ME intervention significantly attenuated the aforementioned parameter changes, suggesting that E2 and 2ME partially ameliorate hypoxic pulmonary hypertension. The underlying mechanism of this may be associated with the increase in MnSOD activity and expression and reduction in ROS level, which reduces the levels of transcription and translation of HIF-1α.
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Affiliation(s)
- Li Wang
- Department of Respiratory Disease and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
| | - Quan Zheng
- Department of Respiratory Disease and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
| | - Yadong Yuan
- Department of Respiratory Disease and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
| | - Yanpeng Li
- Department of Respiratory Disease and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
| | - Xiaowei Gong
- Department of Respiratory Disease and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
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28
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Cheong HI, Asosingh K, Stephens OR, Queisser KA, Xu W, Willard B, Hu B, Dermawan JKT, Stark GR, Naga Prasad SV, Erzurum SC. Hypoxia sensing through β-adrenergic receptors. JCI Insight 2016; 1:e90240. [PMID: 28018974 DOI: 10.1172/jci.insight.90240] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Life-sustaining responses to low oxygen, or hypoxia, depend on signal transduction by HIFs, but the underlying mechanisms by which cells sense hypoxia are not completely understood. Based on prior studies suggesting a link between the β-adrenergic receptor (β-AR) and hypoxia responses, we hypothesized that the β-AR mediates hypoxia sensing and is necessary for HIF-1α accumulation. Beta blocker treatment of mice suppressed hypoxia induction of renal HIF-1α accumulation, erythropoietin production, and erythropoiesis in vivo. Likewise, beta blocker treatment of primary human endothelial cells in vitro decreased hypoxia-mediated HIF-1α accumulation and binding to target genes and the downstream hypoxia-inducible gene expression. In mechanistic studies, cAMP-activated PKA and/or GPCR kinases (GRK), which both participate in β-AR signal transduction, were investigated. Direct activation of cAMP/PKA pathways did not induce HIF-1α accumulation, and inhibition of PKA did not blunt HIF-1α induction by hypoxia. In contrast, pharmacological inhibition of GRK, or expression of a GRK phosphorylation-deficient β-AR mutant in cells, blocked hypoxia-mediated HIF-1α accumulation. Mass spectrometry-based quantitative analyses revealed a hypoxia-mediated β-AR phosphorylation barcode that was different from the classical agonist phosphorylation barcode. These findings indicate that the β-AR is fundamental to the molecular and physiological responses to hypoxia.
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Affiliation(s)
- Hoi I Cheong
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA.,Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - Kewal Asosingh
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Olivia R Stephens
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA.,Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - Kimberly A Queisser
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Weiling Xu
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Belinda Willard
- Proteomics and Metabolomics Laboratory, Lerner Research Institute
| | - Bo Hu
- Department of Quantitative Health Sciences
| | | | | | | | - Serpil C Erzurum
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA.,Respiratory Institute, Cleveland Clinic, Cleveland, Ohio, USA
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29
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Ebina-Shibuya R, Watanabe-Matsui M, Matsumoto M, Itoh-Nakadai A, Funayama R, Nakayama K, Muto A, Igarashi K. The double knockout of Bach1 and Bach2 in mice reveals shared compensatory mechanisms in regulating alveolar macrophage function and lung surfactant homeostasis. J Biochem 2016; 160:333-344. [DOI: 10.1093/jb/mvw041] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Accepted: 06/05/2016] [Indexed: 11/14/2022] Open
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30
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Arulkumaran N, Deutschman CS, Pinsky MR, Zuckerbraun B, Schumacker PT, Gomez H, Gomez A, Murray P, Kellum JA. MITOCHONDRIAL FUNCTION IN SEPSIS. Shock 2016; 45:271-81. [PMID: 26871665 PMCID: PMC4755359 DOI: 10.1097/shk.0000000000000463] [Citation(s) in RCA: 128] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Mitochondria are an essential part of the cellular infrastructure, being the primary site for high-energy adenosine triphosphate production through oxidative phosphorylation. Clearly, in severe systemic inflammatory states, like sepsis, cellular metabolism is usually altered, and end organ dysfunction is not only common, but also predictive of long-term morbidity and mortality. Clearly, interest is mitochondrial function both as a target for intracellular injury and response to extrinsic stress have been a major focus of basic science and clinical research into the pathophysiology of acute illness. However, mitochondria have multiple metabolic and signaling functions that may be central in both the expression of sepsis and its ultimate outcome. In this review, the authors address five primary questions centered on the role of mitochondria in sepsis. This review should be used both as a summary source in placing mitochondrial physiology within the context of acute illness and as a focal point for addressing new research into diagnostic and treatment opportunities these insights provide.
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Affiliation(s)
| | - Clifford S. Deutschman
- Department of Pediatrics and Molecular Medicine, Hofstra-North Shore-Long Island Jewish School of Medicine
| | - Michael R. Pinsky
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine
| | | | - Paul T. Schumacker
- Departments of Pediatrics-Neonatology, Cell and Molecular Biology and Medicine, Northwestern University Feinberg School of Medicine
| | - Hernando Gomez
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine
- Center for Critical Care Nephrology, University of Pittsburgh, Pittsburgh PA
| | - Alonso Gomez
- Academia Colombiana de Medicina Critica (ACOMEC)
- Division of Critical Care Medicine, Clínica Palermo, Bogotá, Colombia
| | | | - John A. Kellum
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine
- Center for Critical Care Nephrology, University of Pittsburgh, Pittsburgh PA
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31
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Li Q, Mao M, Qiu Y, Liu G, Sheng T, Yu X, Wang S, Zhu D. Key Role of ROS in the Process of 15-Lipoxygenase/15-Hydroxyeicosatetraenoiccid-Induced Pulmonary Vascular Remodeling in Hypoxia Pulmonary Hypertension. PLoS One 2016; 11:e0149164. [PMID: 26871724 PMCID: PMC4752324 DOI: 10.1371/journal.pone.0149164] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 01/28/2016] [Indexed: 01/01/2023] Open
Abstract
We previously reported that 15-lipoxygenase (15-LO) and its metabolite 15-hydroxyeicosatetraenoic acid (15-HETE) were up-regulated in pulmonary arterial cells from both pulmonary artery hypertension patients and hypoxic rats and that these factors mediated the progression of pulmonary hypertension (PH) by affecting the proliferation and apoptosis of pulmonary arterial (PA) cells. However, the underlying mechanisms of the remodeling induced by 15-HETE have remained unclear. As reactive oxygen species (ROS) and 15-LO are both induced by hypoxia, it is possible that ROS are involved in the events of hypoxia-induced 15-LO expression that lead to PH. We employed immunohistochemistry, tube formation assays, bromodeoxyuridine (BrdU) incorporation assays, and cell cycle analyses to explore the role of ROS in the process of 15-HETE-mediated hypoxic pulmonary hypertension (HPH). We found that exogenous 15-HETE facilitated the generation of ROS and that this effect was mainly localized to mitochondria. In particular, the mitochondrial electron transport chain and nicotinamide-adenine dinucleotide phosphate oxidase 4 (Nox4) were responsible for the significant 15-HETE-stimulated increase in ROS production. Moreover, ROS induced by 15-HETE stimulated endothelial cell (EC) migration and promoted pulmonary artery smooth muscle cell (PASMC) proliferation under hypoxia via the p38 MAPK pathway. These results indicated that 15-HETE-regulated ROS mediated hypoxia-induced pulmonary vascular remodeling (PVR) via the p38 MAPK pathway.
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Affiliation(s)
- Qian Li
- Department of Pharmaceutical Analysis, College of Pharmacy, Harbin Medical University, Harbin, Heilongjiang Province, China
- Biological Sciences, Purdue University, West Lafayette, Indiana, United States of America
| | - Min Mao
- Department of Pathophysiology, Harbin Medical University-Daqing, Daqing, Heilongjiang Province, China
- Bio-pharmaceutical Key Laboratory of Harbin, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yanli Qiu
- Department of Pharmaceutical Analysis, College of Pharmacy, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Gaofeng Liu
- Department of Pharmacy, the Second Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Tingting Sheng
- Department of Pathophysiology, Harbin Medical University-Daqing, Daqing, Heilongjiang Province, China
| | - Xiufeng Yu
- Department of Pathophysiology, Harbin Medical University-Daqing, Daqing, Heilongjiang Province, China
| | - Shuang Wang
- Department of Pharmaceutical Analysis, College of Pharmacy, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Daling Zhu
- Department of Pathophysiology, Harbin Medical University-Daqing, Daqing, Heilongjiang Province, China
- Bio-pharmaceutical Key Laboratory of Harbin, Harbin Medical University, Harbin, Heilongjiang Province, China
- * E-mail:
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32
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Sommer N, Strielkov I, Pak O, Weissmann N. Oxygen sensing and signal transduction in hypoxic pulmonary vasoconstriction. Eur Respir J 2015; 47:288-303. [PMID: 26493804 DOI: 10.1183/13993003.00945-2015] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 08/24/2015] [Indexed: 01/17/2023]
Abstract
Hypoxic pulmonary vasoconstriction (HPV), also known as the von Euler-Liljestrand mechanism, is an essential response of the pulmonary vasculature to acute and sustained alveolar hypoxia. During local alveolar hypoxia, HPV matches perfusion to ventilation to maintain optimal arterial oxygenation. In contrast, during global alveolar hypoxia, HPV leads to pulmonary hypertension. The oxygen sensing and signal transduction machinery is located in the pulmonary arterial smooth muscle cells (PASMCs) of the pre-capillary vessels, albeit the physiological response may be modulated in vivo by the endothelium. While factors such as nitric oxide modulate HPV, reactive oxygen species (ROS) have been suggested to act as essential mediators in HPV. ROS may originate from mitochondria and/or NADPH oxidases but the exact oxygen sensing mechanisms, as well as the question of whether increased or decreased ROS cause HPV, are under debate. ROS may induce intracellular calcium increase and subsequent contraction of PASMCs via direct or indirect interactions with protein kinases, phospholipases, sarcoplasmic calcium channels, transient receptor potential channels, voltage-dependent potassium channels and L-type calcium channels, whose relevance may vary under different experimental conditions. Successful identification of factors regulating HPV may allow development of novel therapeutic approaches for conditions of disturbed HPV.
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Affiliation(s)
- Natascha Sommer
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Ievgen Strielkov
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Oleg Pak
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
| | - Norbert Weissmann
- Excellence Cluster Cardiopulmonary System, University of Giessen Lung Center, German Center for Lung Research (DZL), Justus-Liebig-University, Giessen, Germany
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33
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NADPH oxidases—do they play a role in TRPC regulation under hypoxia? Pflugers Arch 2015; 468:23-41. [DOI: 10.1007/s00424-015-1731-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 08/23/2015] [Accepted: 08/25/2015] [Indexed: 12/25/2022]
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34
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Abstract
Hypoxic pulmonary vasoconstriction (HPV) represents a fundamental difference between the pulmonary and systemic circulations. HPV is active in utero, reducing pulmonary blood flow, and in adults helps to match regional ventilation and perfusion although it has little effect in healthy lungs. Many factors affect HPV including pH or PCO2, cardiac output, and several drugs, including antihypertensives. In patients with lung pathology and any patient having one-lung ventilation, HPV contributes to maintaining oxygenation, so anesthesiologists should be aware of the effects of anesthesia on this protective reflex. Intravenous anesthetic drugs have little effect on HPV, but it is attenuated by inhaled anesthetics, although less so with newer agents. The reflex is biphasic, and once the second phase becomes active after about an hour of hypoxia, this pulmonary vasoconstriction takes hours to reverse when normoxia returns. This has significant clinical implications for repeated periods of one-lung ventilation.
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35
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Vera S, Martínez R, Gormaz JG, Gajardo A, Galleguillos F, Rodrigo R. Novel relationships between oxidative stress and angiogenesis-related factors in sepsis: New biomarkers and therapies. Ann Med 2015; 47:289-300. [PMID: 25998489 DOI: 10.3109/07853890.2015.1029967] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Sepsis is a systemic uncontrolled inflammatory response in the presence of an infection. It remains a major cause of morbidity and mortality in hospitalized patients. According to its severity, sepsis can progress to three different states: severe sepsis, septic shock, and multiple organ dysfunction syndrome, related to organ dysfunction and/or tissue hypoperfusion. Different processes underlie its pathophysiology; among them are oxidative stress, endothelial and mitochondrial dysfunction, and angiogenesis-related factors. However, no studies have integrated these elements in sepsis. The main difficulty in sepsis is its diagnosis. Currently, the potential of inflammatory biomarkers in septic patients remains weak. In this context, the research into new biomarkers is essential to aid with sepsis diagnosis and prognostication. Furthermore, even though the current management of severe forms of sepsis has been effective, morbimortality remains elevated. Therefore, it is essential to explore alternative approaches to therapy development. The aim of this review is to present an update of evidence supporting the role of oxidative stress and angiogenesis-related factors in the pathophysiology of the different forms of sepsis. It proposes a novel convergence between both elements in their role in the disease, and it will cover their utility as new diagnostic tools, predictors of outcome, and as novel therapeutic targets.
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Affiliation(s)
- Sergio Vera
- Laboratory of Oxidative Stress and Nephrotoxicity, Molecular and Clinical Pharmacology Program, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile , Santiago , Chile
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36
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Lu H, Wang R, Xiong J, Xie H, Kayser B, Jia Z. In search for better pharmacological prophylaxis for acute mountain sickness: looking in other directions. Acta Physiol (Oxf) 2015; 214:51-62. [PMID: 25778288 DOI: 10.1111/apha.12490] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 02/23/2015] [Accepted: 03/11/2015] [Indexed: 12/15/2022]
Abstract
Despite decades of research, the exact pathogenic mechanisms underlying acute mountain sickness (AMS) are still poorly understood. This fact frustrates the search for novel pharmacological prophylaxis for AMS. The prevailing view is that AMS results from an insufficient physiological response to hypoxia and that prophylaxis should aim at stimulating the response. Starting off from the opposite hypothesis that AMS may be caused by an initial excessive response to hypoxia, we suggest that directly or indirectly blunting-specific parts of the response might provide promising research alternatives. This reasoning is based on the observations that (i) humans, once acclimatized, can climb Mt Everest experiencing arterial partial oxygen pressures (PaO2) as low as 25 mmHg without AMS symptoms; (ii) paradoxically, AMS usually develops at much higher PaO2 levels; and (iii) several biomarkers, suggesting initial activation of specific pathways at such PaO2, are correlated with AMS. Apart from looking for substances that stimulate certain hypoxia triggered effects, such as the ventilatory response to hypoxia, we suggest to also investigate pharmacological means aiming at blunting certain other specific hypoxia-activated pathways, or stimulating their agonists, in the quest for better pharmacological prophylaxis for AMS.
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Affiliation(s)
- H. Lu
- Key Laboratory of the Plateau of Environmental Damage Control; Lanzhou General Hospital of Lanzhou Military Command; Lanzhou China
| | - R. Wang
- Key Laboratory of the Plateau of Environmental Damage Control; Lanzhou General Hospital of Lanzhou Military Command; Lanzhou China
| | - J. Xiong
- Key Laboratory of the Plateau of Environmental Damage Control; Lanzhou General Hospital of Lanzhou Military Command; Lanzhou China
| | - H. Xie
- Key Laboratory of the Plateau of Environmental Damage Control; Lanzhou General Hospital of Lanzhou Military Command; Lanzhou China
| | - B. Kayser
- Institute of Sports Sciences and Department of Physiology; University of Lausanne; Lausanne Switzerland
| | - Z.P. Jia
- Key Laboratory of the Plateau of Environmental Damage Control; Lanzhou General Hospital of Lanzhou Military Command; Lanzhou China
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Veit F, Pak O, Brandes RP, Weissmann N. Hypoxia-dependent reactive oxygen species signaling in the pulmonary circulation: focus on ion channels. Antioxid Redox Signal 2015; 22:537-52. [PMID: 25545236 PMCID: PMC4322788 DOI: 10.1089/ars.2014.6234] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
SIGNIFICANCE An acute lack of oxygen in the lung causes hypoxic pulmonary vasoconstriction, which optimizes gas exchange. In contrast, chronic hypoxia triggers a pathological vascular remodeling causing pulmonary hypertension, and ischemia can cause vascular damage culminating in lung edema. RECENT ADVANCES Regulation of ion channel expression and gating by cellular redox state is a widely accepted mechanism; however, it remains a matter of debate whether an increase or a decrease in reactive oxygen species (ROS) occurs under hypoxic conditions. Ion channel redox regulation has been described in detail for some ion channels, such as Kv channels or TRPC6. However, in general, information on ion channel redox regulation remains scant. CRITICAL ISSUES AND FUTURE DIRECTIONS In addition to the debate of increased versus decreased ROS production during hypoxia, we aim here at describing and deciphering why different oxidants, under different conditions, can cause both activation and inhibition of channel activity. While the upstream pathways affecting channel gating are often well described, we need a better understanding of redox protein modifications to be able to determine the complexity of ion channel redox regulation. Against this background, we summarize the current knowledge on hypoxia-induced ROS-mediated ion channel signaling in the pulmonary circulation.
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Affiliation(s)
- Florian Veit
- 1 Excellence Cluster Cardiopulmonary System (ECCPS), Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL) , Giessen, Germany
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Abstract
SIGNIFICANCE The pulmonary circulation is a low-pressure, low-resistance, highly compliant vasculature. In contrast to the systemic circulation, it is not primarily regulated by a central nervous control mechanism. The regulation of resting membrane potential due to ion channels is of integral importance in the physiology and pathophysiology of the pulmonary vasculature. RECENT ADVANCES Redox-driven ion conductance changes initiated by direct oxidation, nitration, and S-nitrosylation of the cysteine thiols and indirect phosphorylation of the threonine and serine residues directly affect pulmonary vascular tone. CRITICAL ISSUES Molecular mechanisms of changes in ion channel conductance, especially the identification of the sites of action, are still not fully elucidated. FUTURE DIRECTIONS Further investigation of the interaction between redox status and ion channel gating, especially the physiological significance of S-glutathionylation and S-nitrosylation, could result in a better understanding of the physiological and pathophysiological importance of these mediators in general and the implications of such modifications in cellular functions and related diseases and their importance for targeted treatment strategies.
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Affiliation(s)
- Andrea Olschewski
- 1 Ludwig Boltzmann Institute for Lung Vascular Research , Graz, Austria
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39
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Wang LM, Zhong NZ, Liu SJ, Zhu XY, Liu YJ. Hypoxia-induced acute lung injury is aggravated in Streptozotocin diabetic mice. Exp Lung Res 2014; 41:146-54. [DOI: 10.3109/01902148.2014.983280] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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40
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Woodside JDS, Gutowski M, Fall L, James PE, McEneny J, Young IS, Ogoh S, Bailey DM. Systemic oxidative-nitrosative-inflammatory stress during acute exercise in hypoxia; implications for microvascular oxygenation and aerobic capacity. Exp Physiol 2014; 99:1648-62. [DOI: 10.1113/expphysiol.2014.081265] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- John D. S. Woodside
- Vascular Physiology Unit; Institute of Cardiovascular Science; University College London; London UK
| | - Mariusz Gutowski
- Institute of Biochemistry and Cell Biology; Shanghai Institute for Biological Sciences; Chinese Academy of Sciences; Shanghai China
| | - Lewis Fall
- Neurovascular Research Laboratory; Faculty of Life Sciences and Education; University of South Wales; Pontypridd UK
| | - Philip E. James
- Wales Heart Research Institute; Cardiff University School of Medicine; Heath Park Cardiff Pontypridd UK
| | - Jane McEneny
- Centre for Public Health; Nutrition and Metabolism Group; Queen's University Belfast; Belfast UK
| | - Ian S. Young
- Centre for Public Health; Nutrition and Metabolism Group; Queen's University Belfast; Belfast UK
| | - Shigehiko Ogoh
- Department of Biomedical Engineering; Toyo University; Kawagoe-Shi Saitama Japan
| | - Damian M. Bailey
- Neurovascular Research Laboratory; Faculty of Life Sciences and Education; University of South Wales; Pontypridd UK
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41
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Cano I, Selivanov V, Gomez-Cabrero D, Tegnér J, Roca J, Wagner PD, Cascante M. Oxygen pathway modeling estimates high reactive oxygen species production above the highest permanent human habitation. PLoS One 2014; 9:e111068. [PMID: 25375931 PMCID: PMC4222897 DOI: 10.1371/journal.pone.0111068] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 09/19/2014] [Indexed: 11/19/2022] Open
Abstract
The production of reactive oxygen species (ROS) from the inner mitochondrial membrane is one of many fundamental processes governing the balance between health and disease. It is well known that ROS are necessary signaling molecules in gene expression, yet when expressed at high levels, ROS may cause oxidative stress and cell damage. Both hypoxia and hyperoxia may alter ROS production by changing mitochondrial Po2 (PmO2). Because PmO2 depends on the balance between O2 transport and utilization, we formulated an integrative mathematical model of O2 transport and utilization in skeletal muscle to predict conditions to cause abnormally high ROS generation. Simulations using data from healthy subjects during maximal exercise at sea level reveal little mitochondrial ROS production. However, altitude triggers high mitochondrial ROS production in muscle regions with high metabolic capacity but limited O2 delivery. This altitude roughly coincides with the highest location of permanent human habitation. Above 25,000 ft., more than 90% of exercising muscle is predicted to produce abnormally high levels of ROS, corresponding to the "death zone" in mountaineering.
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Affiliation(s)
- Isaac Cano
- Center for respiratory diagnoses, Hospital Clinic and Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Centro de Investigación Biomédica en Red en Enfermedades Respiratorias (CIBERES) and Universitat de Barcelona, Barcelona, Catalonia, Spain
| | - Vitaly Selivanov
- Departament de Bioquimica i Biologia Molecular, Facultat de Biologia, Universitat de Barcelona and Institute of Biomedicine (IBUB), Barcelona, Catalonia, Spain
| | - David Gomez-Cabrero
- Unit of Computational Medicine of the Center for Molecular Medicine, Karolinska Institutet and Karoliska University Hospital - Department of Medicine, Stockholm, Sweden
| | - Jesper Tegnér
- Unit of Computational Medicine of the Center for Molecular Medicine, Karolinska Institutet and Karoliska University Hospital - Department of Medicine, Stockholm, Sweden
| | - Josep Roca
- Center for respiratory diagnoses, Hospital Clinic and Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Centro de Investigación Biomédica en Red en Enfermedades Respiratorias (CIBERES) and Universitat de Barcelona, Barcelona, Catalonia, Spain
| | - Peter D. Wagner
- Division of Physiology, Pulmonary and Critical Care Medicine, University of California San Diego, San Diego, California, United States of America
| | - Marta Cascante
- Departament de Bioquimica i Biologia Molecular, Facultat de Biologia, Universitat de Barcelona and Institute of Biomedicine (IBUB), Barcelona, Catalonia, Spain
- * E-mail:
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42
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Yao M, Wang X, Tang Y, Zhang W, Cui B, Liu Q, Xing L. Dicer mediating the expression of miR-143 and miR-155 regulates hexokinase II associated cellular response to hypoxia. Am J Physiol Lung Cell Mol Physiol 2014; 307:L829-37. [PMID: 25172909 DOI: 10.1152/ajplung.00081.2014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Lung alveolar epithelial cells are exposed to hypoxia under a variety of physiological and pathological conditions. It has been shown recently that miR-143, which can directly target the key glycolytic enzyme hexokinase II (HK2), may be regulated by miR-155. We investigated whether microRNAs contribute to the cellular glycolysis in response to hypoxia. Using the A549 cells, we found that the expression of Dicer is decreased under hypoxia. When Dicer was knocked down with small-interfering RNA (siRNA), pre-miR143 was increased and mature miR-143 was decreased as that in hypoxia, indicating that reduction of Dicer is responsible for the change of miR-143 under hypoxia. Interestingly, both hypoxia and knockdown of Dicer resulted in miR-155 and pre-miR-155 expression increases. We also examined the expression of HK2 and glucose metabolism in the cells. Both HK2 mRNA and protein were increased under hypoxia, which is accompanied by an increase of glucose uptake and production of lactate. The same alterations were found with siRNA Dicer knockdown. Moreover, transfection with anti-miR-143 also led to a HK2 production and an increase of glucose uptake and lactate production, whereas anti-miR-155 had opposite effects. The miR-143 and anti-miR-155 transfection resulted in a significant cell apoptosis. The expression of Dicer was decreased with HK2 accumulating in mouse lung tissues under hypoxia identified by immunohistochemistry. The changes of miR-143 and miR-155 were similar to those in A549 cells. Our data demonstrate that Dicer regulation of miRNAs promotes HK2 activation and glycolysis, which might protect the cell from hypoxic damage and enter into an adaptive process.
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Affiliation(s)
- Mengying Yao
- Department of Severe Respiratory Diseases, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xinhua Wang
- Department of Oncology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Ying Tang
- Shanghai Navy Medical Institute, Shanghai, China
| | - Weihong Zhang
- Department of Anatomy, Nursing College of Zhengzhou University, Zhengzhou, China; and
| | - Bing Cui
- Center of Kidney Diseases, the First Affiliated Hospital, Henan College of Traditional Chinese Medicine, Zhengzhou, China
| | - Qiuhong Liu
- Department of Severe Respiratory Diseases, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Lihua Xing
- Department of Severe Respiratory Diseases, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China;
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Zupančič Š, Kocbek P, Zariwala MG, Renshaw D, Gul MO, Elsaid Z, Taylor KMG, Somavarapu S. Design and development of novel mitochondrial targeted nanocarriers, DQAsomes for curcumin inhalation. Mol Pharm 2014; 11:2334-45. [PMID: 24852198 DOI: 10.1021/mp500003q] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Curcumin has potent antioxidant and anti-inflammatory properties but poor absorption following oral administration owing to its low aqueous solubility. Development of novel formulations to improve its in vivo efficacy is therefore challenging. In this study, formulation of curcumin-loaded DQAsomes (vesicles formed from the amphiphile, dequalinium) for pulmonary delivery is presented for the first time. The vesicles demonstrated mean hydrodynamic diameters between 170 and 200 nm, with a ζ potential of approximately +50 mV, high drug loading (up to 61%) and encapsulation efficiency (90%), resulting in enhanced curcumin aqueous solubility. Curcumin encapsulation in DQAsomes in the amorphous state was confirmed by X-ray diffraction and differential scanning calorimetry analysis. The existence of hydrogen bonds and cation-π interaction between curcumin and vesicle building blocks, namely dequalinium molecules, were shown in lyophilized DQAsomes using FT-IR analysis. Encapsulation of curcumin in DQAsomes enhanced the antioxidant activity of curcumin compared to free curcumin. DQAsome dispersion was successfully nebulized with the majority of the delivered dose deposited in the second stage of the twin-stage impinger. The vesicles showed potential for mitochondrial targeting. Curcumin-loaded DQAsomes thus represent a promising inhalation formulation with improved stability characteristics and mitochondrial targeting ability, indicating a novel approach for efficient curcumin delivery for effective treatment of acute lung injury and the rationale for future in vivo studies.
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Affiliation(s)
- Špela Zupančič
- Faculty of Pharmacy, University of Ljubljana , Aškerčeva Cesta 7, 1000 Ljubljana, Slovenia
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44
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Hernansanz-Agustín P, Izquierdo-Álvarez A, Sánchez-Gómez FJ, Ramos E, Villa-Piña T, Lamas S, Bogdanova A, Martínez-Ruiz A. Acute hypoxia produces a superoxide burst in cells. Free Radic Biol Med 2014; 71:146-156. [PMID: 24637263 DOI: 10.1016/j.freeradbiomed.2014.03.011] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 03/07/2014] [Accepted: 03/08/2014] [Indexed: 01/08/2023]
Abstract
Oxygen is a key molecule for cell metabolism. Eukaryotic cells sense the reduction in oxygen availability (hypoxia) and trigger a series of cellular and systemic responses to adapt to hypoxia, including the optimization of oxygen consumption. Many of these responses are mediated by a genetic program induced by the hypoxia-inducible transcription factors (HIFs), regulated by a family of prolyl hydroxylases (PHD or EGLN) that use oxygen as a substrate producing HIF hydroxylation. In parallel to these oxygen sensors modulating gene expression within hours, acute modulation of protein function in response to hypoxia is known to occur within minutes. Free radicals acting as second messengers, and oxidative posttranslational modifications, have been implied in both groups of responses. Localization and speciation of the paradoxical increase in reactive oxygen species production in hypoxia remain debatable. We have observed that several cell types respond to acute hypoxia with a transient increase in superoxide production for about 10 min, probably originating in the mitochondria. This may explain in part the apparently divergent results found by various groups that have not taken into account the time frame of hypoxic ROS production. We propose that this acute and transient hypoxia-induced superoxide burst may be translated into oxidative signals contributing to hypoxic adaptation and preconditioning.
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Affiliation(s)
- Pablo Hernansanz-Agustín
- Servicio de Inmunología, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa, E-28006 Madrid, Spain; Departamento de Bioquímica, Facultad de Medicina, Universidad Autónoma de Madrid and Instituto de Investigaciones Biomédicas Alberto Sols, E-28029 Madrid, Spain
| | - Alicia Izquierdo-Álvarez
- Servicio de Inmunología, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa, E-28006 Madrid, Spain
| | - Francisco J Sánchez-Gómez
- Laboratorio Mixto, Consejo Superior de Investigaciones Científicas/Fundación Renal "Iñigo Alvarez de Toledo," E-28049 Madrid, Spain; Departamento de Biología Celular e Inmunología, Centro de Biología Molecular "Severo Ochoa," Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Elena Ramos
- Servicio de Inmunología, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa, E-28006 Madrid, Spain
| | - Tamara Villa-Piña
- Servicio de Inmunología, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa, E-28006 Madrid, Spain
| | - Santiago Lamas
- Laboratorio Mixto, Consejo Superior de Investigaciones Científicas/Fundación Renal "Iñigo Alvarez de Toledo," E-28049 Madrid, Spain; Departamento de Biología Celular e Inmunología, Centro de Biología Molecular "Severo Ochoa," Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Anna Bogdanova
- Institute of Veterinary Physiology, Vetsuisse Faculty, and Zurich Center for Integrative Human Physiology, University of Zurich, CH-8057 Zurich, Switzerland
| | - Antonio Martínez-Ruiz
- Servicio de Inmunología, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa, E-28006 Madrid, Spain.
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45
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Lottes RG, Newton DA, Spyropoulos DD, Baatz JE. Alveolar type II cells maintain bioenergetic homeostasis in hypoxia through metabolic and molecular adaptation. Am J Physiol Lung Cell Mol Physiol 2014; 306:L947-55. [PMID: 24682450 DOI: 10.1152/ajplung.00298.2013] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Although many lung diseases are associated with hypoxia, alveolar type II epithelial (ATII) cell impairment, and pulmonary surfactant dysfunction, the effects of O(2) limitation on metabolic pathways necessary to maintain cellular energy in ATII cells have not been studied extensively. This report presents results of targeted assays aimed at identifying specific metabolic processes that contribute to energy homeostasis using primary ATII cells and a model ATII cell line, mouse lung epithelial 15 (MLE-15), cultured in normoxic and hypoxic conditions. MLEs cultured in normoxia demonstrated a robust O(2) consumption rate (OCR) coupled to ATP generation and limited extracellular lactate production, indicating reliance on oxidative phosphorylation for ATP production. Pharmacological uncoupling of respiration increased OCR in normoxic cultures to 175% of basal levels, indicating significant spare respiratory capacity. However, when exposed to hypoxia for 20 h, basal O(2) consumption fell to 60% of normoxic rates, and cells maintained only ∼50% of normoxic spare respiratory capacity, indicating suppression of mitochondrial function, although intracellular ATP levels remained at near normoxic levels. Moreover, while hypoxic exposure stimulated glycogen synthesis and storage in MLE-15, glycolytic rate (as measured by lactate generation) was not significantly increased in the cells, despite enhanced expression of several enzymes related to glycolysis. These results were largely recapitulated in murine primary ATII, demonstrating MLE-15 suitability for modeling ATII metabolism. The ability of ATII cells to maintain ATP levels in hypoxia without enhancing glycolysis suggests that these cells are exceptionally efficient at conserving ATP to maintain bioenergetic homeostasis under O(2) limitation.
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Affiliation(s)
- Robyn G Lottes
- Department of Pediatrics, Medical University of South Carolina, Charleston, South Carolia; and
| | - Danforth A Newton
- Department of Pediatrics, Medical University of South Carolina, Charleston, South Carolia; and
| | - Demetri D Spyropoulos
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolia
| | - John E Baatz
- Department of Pediatrics, Medical University of South Carolina, Charleston, South Carolia; and
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Abstract
Hypoxic pulmonary vasoconstriction (HPV) continues to fascinate cardiopulmonary physiologists and clinicians since its definitive description in 1946. Hypoxic vasoconstriction exists in all vertebrate gas exchanging organs. This fundamental response of the pulmonary vasculature in air breathing animals has relevance to successful fetal transition to air breathing at birth and as a mechanism of ventilation-perfusion matching in health and disease. It is a complex process intrinsic to the vascular smooth muscle, but with in vivo modulation by a host of factors including the vascular endothelium, erythrocytes, pulmonary innervation, circulating hormones and acid-base status to name only a few. This review will provide a broad overview of HPV and its mechansms and discuss the advantages and disadvantages of HPV in normal physiology, disease and high altitude.
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Affiliation(s)
- Erik R Swenson
- Department of Medicine, University of Washington, VA Puget Sound Health Care System, Seattle, WA 98108, USA.
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47
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Paddenberg R, Mermer P, Goldenberg A, Kummer W. Videomorphometric analysis of hypoxic pulmonary vasoconstriction of intra-pulmonary arteries using murine precision cut lung slices. J Vis Exp 2014:e50970. [PMID: 24458260 PMCID: PMC4089409 DOI: 10.3791/50970] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Acute alveolar hypoxia causes pulmonary vasoconstriction (HPV) - also known as von Euler-Liljestrand mechanism - which serves to match lung perfusion to ventilation. Up to now, the underlying mechanisms are not fully understood. The major vascular segment contributing to HPV is the intra-acinar artery. This vessel section is responsible for the blood supply of an individual acinus, which is defined as the portion of lung distal to a terminal bronchiole. Intra-acinar arteries are mostly located in that part of the lung that cannot be selectively reached by a number of commonly used techniques such as measurement of the pulmonary artery pressure in isolated perfused lungs or force recordings from dissected proximal pulmonary artery segments(1,2). The analysis of subpleural vessels by real-time confocal laser scanning luminescence microscopy is limited to vessels with up to 50 µm in diameter(3). We provide a technique to study HPV of murine intra-pulmonary arteries in the range of 20-100 µm inner diameters. It is based on the videomorphometric analysis of cross-sectioned arteries in precision cut lung slices (PCLS). This method allows the quantitative measurement of vasoreactivity of small intra-acinar arteries with inner diameter between 20-40 µm which are located at gussets of alveolar septa next to alveolar ducts and of larger pre-acinar arteries with inner diameters between 40-100 µm which run adjacent to bronchi and bronchioles. In contrast to real-time imaging of subpleural vessels in anesthetized and ventilated mice, videomorphometric analysis of PCLS occurs under conditions free of shear stress. In our experimental model both arterial segments exhibit a monophasic HPV when exposed to medium gassed with 1% O2 and the response fades after 30-40 min at hypoxia.
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Affiliation(s)
| | - Petra Mermer
- Institute of Anatomy and Cell Biology, Justus-Liebig-University
| | - Anna Goldenberg
- Institute of Anatomy and Cell Biology, Justus-Liebig-University
| | - Wolfgang Kummer
- Institute of Anatomy and Cell Biology, Justus-Liebig-University
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48
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Hu JF, Zhang GJ, Wang L, Kang PF, Li J, Wang HJ, Gao Q, Chen YQ. Ethanol at low concentration attenuates diabetes induced lung injury in rats model. J Diabetes Res 2014; 2014:107152. [PMID: 25019090 PMCID: PMC4082928 DOI: 10.1155/2014/107152] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Accepted: 05/26/2014] [Indexed: 01/01/2023] Open
Abstract
To observe the changes of lung injury when diabetic rats were treated with low concentration of ethanol (EtOH) and analyze the related mechanisms, male Sprague-Dawley (SD) rats were divided into control, diabetic (DM), and EtOH+DM groups. Diabetic rat was mimicked by injection of streptozotocin intraperitoneally. Fasting blood glucose (FBG) level, lung weight (LW), body weight (BW), and LW/BW were measured. The changes of lung tissue and Type II alveolar cell were detected. Pulmonary malondialdehyde (MDA) content and superoxide dismutase (SOD) activity were measured; meanwhile, ALDH2 mRNA and protein expressions were detected by RT-PCR and western blotting, respectively. Compared with control group, in DM group, SOD activity was decreased; FBG level, LW/BW, MDA content, ALDH2 mRNA, and protein expressions were decreased. Compared with DM group, in EtOH+DM group, SOD activity, ALDH2 mRNA, and protein expressions were increased; LW/BW and MDA content were decreased. The structures of lung tissue and lamellar bodies were collapsed in DM group; the injury was attenuated in EtOH+DM group. Our findings suggested that, in diabetic rat, pulmonary ALDH2 expression was decreased accompanying lung injury. EtOH at low concentration decreased diabetes induced lung injury through activating ALDH2 expression.
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Affiliation(s)
- Jun-Feng Hu
- Department of Respiratory Disease, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
| | - Guan-Jun Zhang
- Department of Physiology, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu 233030, China
| | - Lei Wang
- Department of Physiology, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu 233030, China
| | - Pin-Fang Kang
- Department of Cardiovascular Disease, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
| | - Jun Li
- Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing 100700, China
| | - Hong-Ju Wang
- Department of Cardiovascular Disease, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
| | - Qin Gao
- Department of Physiology, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu 233030, China
- *Qin Gao:
| | - Yu-Qing Chen
- Department of Respiratory Disease, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, China
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Quintero M, Gonzalez-Martin MDC, Vega-Agapito V, Gonzalez C, Obeso A, Farré R, Agapito T, Yubero S. The effects of intermittent hypoxia on redox status, NF-κB activation, and plasma lipid levels are dependent on the lowest oxygen saturation. Free Radic Biol Med 2013; 65:1143-1154. [PMID: 24002010 DOI: 10.1016/j.freeradbiomed.2013.08.180] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2013] [Revised: 08/01/2013] [Accepted: 08/23/2013] [Indexed: 12/11/2022]
Abstract
Obstructive sleep apnea syndrome (OSAS) is described as repetitive obstructions of the upper airways during sleep, causing concomitant episodes of systemic hypoxia and associated cardiovascular and metabolic pathologies. The mechanisms generating these pathologies are controversial. Because recurrent hypoxia is the element of inadequate respiration that leads to the pathology, experimental models of OSAS consist in the exposure of the animals to intermittent hypoxia (IH) by cycling O2 percentages in their habitats. A proposed mechanism linking the IH of OSAS to pathologies is the increased production of reactive oxygen species (ROS). However, it has been argued that many patients seem to lack oxidative stress and that, to augment ROS in IH animals, intense hypoxia, seldom encountered in patients, has to be applied. To solve the controversy, we have exposed rats to two intensities of IH (cycles of 10 or 5% O2, 40s, and then 21% O2, 80s; 8h/day, 15 days). We then measured reduced and oxidized glutathione and lipid peroxide levels, aconitase and fumarase activities, and ROS-disposal enzyme activity in liver, brain, and lung. Liver levels of nuclear NF-κB-p65 and plasma C-reactive protein (CRP), as well as lipid levels, were also assessed. Lowest hemoglobin saturations were 91.7 ± 0.8 and 73.5 ± 1.4%. IH caused tissue-specific oxidative stress related to hypoxic intensity. Nuclear NF-κB-p65 and lipid content in the liver and CRP in the plasma all increased with IH intensity, as did both plasma triglycerides and cholesterol. We conclude that IH, even of moderate intensity, causes oxidative stress probably related to the pathologies encountered in OSAS patients.
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Affiliation(s)
- Miguel Quintero
- Institute of Molecular Biology and Genetics, CSIC, Department of Biochemistry and Molecular Biology and Physiology, School of Medicine, University of Valladolid, 47005 Valladolid, Spain
| | - María Del Carmen Gonzalez-Martin
- Institute of Molecular Biology and Genetics, CSIC, Department of Biochemistry and Molecular Biology and Physiology, School of Medicine, University of Valladolid, 47005 Valladolid, Spain
| | - Victoria Vega-Agapito
- Institute of Molecular Biology and Genetics, CSIC, Department of Biochemistry and Molecular Biology and Physiology, School of Medicine, University of Valladolid, 47005 Valladolid, Spain
| | - Constancio Gonzalez
- Institute of Molecular Biology and Genetics, CSIC, Department of Biochemistry and Molecular Biology and Physiology, School of Medicine, University of Valladolid, 47005 Valladolid, Spain; CIBER Enfermedades Respiratorias, Institute of Salud Carlos III, 28029 Madrid, Spain
| | - Ana Obeso
- Institute of Molecular Biology and Genetics, CSIC, Department of Biochemistry and Molecular Biology and Physiology, School of Medicine, University of Valladolid, 47005 Valladolid, Spain; CIBER Enfermedades Respiratorias, Institute of Salud Carlos III, 28029 Madrid, Spain
| | - Ramon Farré
- CIBER Enfermedades Respiratorias, Institute of Salud Carlos III, 28029 Madrid, Spain; Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona-IDIBAPS, Barcelona, Spain
| | - Teresa Agapito
- Institute of Molecular Biology and Genetics, CSIC, Department of Biochemistry and Molecular Biology and Physiology, School of Medicine, University of Valladolid, 47005 Valladolid, Spain; CIBER Enfermedades Respiratorias, Institute of Salud Carlos III, 28029 Madrid, Spain
| | - Sara Yubero
- Institute of Molecular Biology and Genetics, CSIC, Department of Biochemistry and Molecular Biology and Physiology, School of Medicine, University of Valladolid, 47005 Valladolid, Spain; CIBER Enfermedades Respiratorias, Institute of Salud Carlos III, 28029 Madrid, Spain.
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Kamga Pride C, Mo L, Quesnelle K, Dagda RK, Murillo D, Geary L, Corey C, Portella R, Zharikov S, St Croix C, Maniar S, Chu CT, Khoo NKH, Shiva S. Nitrite activates protein kinase A in normoxia to mediate mitochondrial fusion and tolerance to ischaemia/reperfusion. Cardiovasc Res 2013; 101:57-68. [PMID: 24081164 DOI: 10.1093/cvr/cvt224] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIMS Nitrite (NO2(-)), a dietary constituent and nitric oxide (NO) oxidation product, mediates cardioprotection after ischaemia/reperfusion (I/R) in a number of animal models when administered during ischaemia or as a pre-conditioning agent hours to days prior to the ischaemic episode. When present during ischaemia, the reduction of nitrite to bioactive NO by deoxygenated haem proteins accounts for its protective effects. However, the mechanism of nitrite-induced pre-conditioning, a normoxic response which does not appear to require reduction of nitrite to NO, remains unexplored. METHODS AND RESULTS Using a model of hypoxia/reoxygenation (H/R) in cultured rat H9c2 cardiomyocytes, we demonstrate that a transient (30 min) normoxic nitrite treatment significantly attenuates cell death after a hypoxic episode initiated 1 h later. Mechanistically, this protection depends on the activation of protein kinase A, which phosphorylates and inhibits dynamin-related protein 1, the predominant regulator of mitochondrial fission. This results morphologically, in the promotion of mitochondrial fusion and functionally in the augmentation of mitochondrial membrane potential and superoxide production. We identify AMP kinase (AMPK) as a downstream target of the mitochondrial reactive oxygen species (ROS) generated and show that its oxidation and subsequent phosphorylation are essential for cytoprotection, as scavenging of ROS prevents AMPK activation and inhibits nitrite-mediated protection after H/R. The protein kinase A-dependent protection mediated by nitrite is reproduced in an intact isolated rat heart model of I/R. CONCLUSIONS These data are the first to demonstrate nitrite-dependent normoxic modulation of both mitochondrial morphology and function and reveal a novel signalling pathway responsible for nitrite-mediated cardioprotection.
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