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Xiao R, Liu J, Shi L, Zhang T, Liu J, Qiu S, Ruiz M, Dupuis J, Zhu L, Wang L, Wang Z, Hu Q. Au-modified ceria nanozyme prevents and treats hypoxia-induced pulmonary hypertension with greatly improved enzymatic activity and safety. J Nanobiotechnology 2024; 22:492. [PMID: 39160624 PMCID: PMC11331617 DOI: 10.1186/s12951-024-02738-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 07/24/2024] [Indexed: 08/21/2024] Open
Abstract
BACKGROUND Despite recent advances the prognosis of pulmonary hypertension remains poor and warrants novel therapeutic options. Extensive studies, including ours, have revealed that hypoxia-induced pulmonary hypertension is associated with high oxidative stress. Cerium oxide nanozyme or nanoparticles (CeNPs) have displayed catalytic activity mimicking both catalase and superoxide dismutase functions and have been widely used as an anti-oxidative stress approach. However, whether CeNPs can attenuate hypoxia-induced pulmonary vascular oxidative stress and pulmonary hypertension is unknown. RESULTS In this study, we designed a new ceria nanozyme or nanoparticle (AuCeNPs) exhibiting enhanced enzyme activity. The AuCeNPs significantly blunted the increase of reactive oxygen species and intracellular calcium concentration while limiting proliferation of pulmonary artery smooth muscle cells and pulmonary vasoconstriction in a model of hypoxia-induced pulmonary hypertension. In addition, the inhalation of nebulized AuCeNPs, but not CeNPs, not only prevented but also blunted hypoxia-induced pulmonary hypertension in rats. The benefits of AuCeNPs were associated with limited increase of intracellular calcium concentration as well as enhancement of extracellular calcium-sensing receptor (CaSR) activity and expression in rat pulmonary artery smooth muscle cells. Nebulised AuCeNPs showed a favorable safety profile, systemic arterial pressure, liver and kidney function, plasma Ca2+ level, and blood biochemical parameters were not affected. CONCLUSION We conclude that AuCeNPs is an improved reactive oxygen species scavenger that effectively prevents and treats hypoxia-induced pulmonary hypertension.
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Affiliation(s)
- Rui Xiao
- Department of Pathophysiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology (HUST), 13 Hangkong Road, Wuhan, 430030, China
- Key Laboratory of Pulmonary Diseases of Ministry of Health, Tongji Medical College, HUST, Wuhan, China
| | - Jia Liu
- Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, HUST, Wuhan, China
| | - Lin Shi
- Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, HUST, Wuhan, China
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, HUST, Wuhan, China
| | - Ting Zhang
- Department of Pathophysiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology (HUST), 13 Hangkong Road, Wuhan, 430030, China
- Key Laboratory of Pulmonary Diseases of Ministry of Health, Tongji Medical College, HUST, Wuhan, China
| | - Jie Liu
- Department of Pathophysiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology (HUST), 13 Hangkong Road, Wuhan, 430030, China
- Key Laboratory of Pulmonary Diseases of Ministry of Health, Tongji Medical College, HUST, Wuhan, China
| | - Shuyi Qiu
- Department of Pathophysiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology (HUST), 13 Hangkong Road, Wuhan, 430030, China
- Key Laboratory of Pulmonary Diseases of Ministry of Health, Tongji Medical College, HUST, Wuhan, China
| | - Matthieu Ruiz
- Department of Nutrition, Université de Montréal, Montreal, Canada
- Montreal Heart Institute, Montréal, Québec, Canada
| | - Jocelyn Dupuis
- Montreal Heart Institute, Montréal, Québec, Canada
- Department of medicine, Université de Montréal, Montréal, Québec, Canada
| | - Liping Zhu
- Department of Pathophysiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology (HUST), 13 Hangkong Road, Wuhan, 430030, China.
- Key Laboratory of Pulmonary Diseases of Ministry of Health, Tongji Medical College, HUST, Wuhan, China.
| | - Lin Wang
- Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, HUST, Wuhan, China.
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, HUST, Wuhan, China.
| | - Zheng Wang
- Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, HUST, Wuhan, China.
- Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, HUST, Wuhan, China.
| | - Qinghua Hu
- Department of Pathophysiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology (HUST), 13 Hangkong Road, Wuhan, 430030, China.
- Key Laboratory of Pulmonary Diseases of Ministry of Health, Tongji Medical College, HUST, Wuhan, China.
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2
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Koziol-White C, Gebski E, Cao G, Panettieri RA. Precision cut lung slices: an integrated ex vivo model for studying lung physiology, pharmacology, disease pathogenesis and drug discovery. Respir Res 2024; 25:231. [PMID: 38824592 PMCID: PMC11144351 DOI: 10.1186/s12931-024-02855-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Accepted: 05/18/2024] [Indexed: 06/03/2024] Open
Abstract
Precision Cut Lung Slices (PCLS) have emerged as a sophisticated and physiologically relevant ex vivo model for studying the intricacies of lung diseases, including fibrosis, injury, repair, and host defense mechanisms. This innovative methodology presents a unique opportunity to bridge the gap between traditional in vitro cell cultures and in vivo animal models, offering researchers a more accurate representation of the intricate microenvironment of the lung. PCLS require the precise sectioning of lung tissue to maintain its structural and functional integrity. These thin slices serve as invaluable tools for various research endeavors, particularly in the realm of airway diseases. By providing a controlled microenvironment, precision-cut lung slices empower researchers to dissect and comprehend the multifaceted interactions and responses within lung tissue, thereby advancing our understanding of pulmonary pathophysiology.
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Affiliation(s)
- Cynthia Koziol-White
- Rutgers Institute for Translational Medicine and Science, The State University of NJ, 08901, Rutgers, New Brunswick, NJ, USA.
| | - Eric Gebski
- Rutgers Institute for Translational Medicine and Science, The State University of NJ, 08901, Rutgers, New Brunswick, NJ, USA
| | - Gaoyaun Cao
- Rutgers Institute for Translational Medicine and Science, The State University of NJ, 08901, Rutgers, New Brunswick, NJ, USA
| | - Reynold A Panettieri
- Rutgers Institute for Translational Medicine and Science, The State University of NJ, 08901, Rutgers, New Brunswick, NJ, USA
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3
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Geng Y, Hu Y, Zhang F, Tuo Y, Ge R, Bai Z. Mitochondria in hypoxic pulmonary hypertension, roles and the potential targets. Front Physiol 2023; 14:1239643. [PMID: 37645564 PMCID: PMC10461481 DOI: 10.3389/fphys.2023.1239643] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/03/2023] [Indexed: 08/31/2023] Open
Abstract
Mitochondria are the centrol hub for cellular energy metabolisms. They regulate fuel metabolism by oxygen levels, participate in physiological signaling pathways, and act as oxygen sensors. Once oxygen deprived, the fuel utilizations can be switched from mitochondrial oxidative phosphorylation to glycolysis for ATP production. Notably, mitochondria can also adapt to hypoxia by making various functional and phenotypes changes to meet the demanding of oxygen levels. Hypoxic pulmonary hypertension is a life-threatening disease, but its exact pathgenesis mechanism is still unclear and there is no effective treatment available until now. Ample of evidence indicated that mitochondria play key factor in the development of hypoxic pulmonary hypertension. By hypoxia-inducible factors, multiple cells sense and transmit hypoxia signals, which then control the expression of various metabolic genes. This activation of hypoxia-inducible factors considered associations with crosstalk between hypoxia and altered mitochondrial metabolism, which plays an important role in the development of hypoxic pulmonary hypertension. Here, we review the molecular mechanisms of how hypoxia affects mitochondrial function, including mitochondrial biosynthesis, reactive oxygen homeostasis, and mitochondrial dynamics, to explore the potential of improving mitochondrial function as a strategy for treating hypoxic pulmonary hypertension.
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Affiliation(s)
- Yumei Geng
- Key Laboratory of High Altitude Medicine (Ministry of Education), Key Laboratory of Application and Foundation for High Altitude Medicine Research in Qinghai Province (Qinghai-Utah Joint Research Key Lab for High Altitude Medicine), Research Center for High Altitude Medicine, Qinghai University, Xining, China
- Department of Respiratory and Critical Care Medicine, Qinghai Provincial People’s Hospital, Xining, China
| | - Yu Hu
- Department of Pharmacy, Qinghai Provincial Traffic Hospital, Xining, China
| | - Fang Zhang
- Department of Respiratory and Critical Care Medicine, Qinghai Provincial People’s Hospital, Xining, China
| | - Yajun Tuo
- Department of Respiratory and Critical Care Medicine, Qinghai Provincial People’s Hospital, Xining, China
| | - Rili Ge
- Key Laboratory of High Altitude Medicine (Ministry of Education), Key Laboratory of Application and Foundation for High Altitude Medicine Research in Qinghai Province (Qinghai-Utah Joint Research Key Lab for High Altitude Medicine), Research Center for High Altitude Medicine, Qinghai University, Xining, China
| | - Zhenzhong Bai
- Key Laboratory of High Altitude Medicine (Ministry of Education), Key Laboratory of Application and Foundation for High Altitude Medicine Research in Qinghai Province (Qinghai-Utah Joint Research Key Lab for High Altitude Medicine), Research Center for High Altitude Medicine, Qinghai University, Xining, China
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4
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Yan K, Zheng J, Kluth MA, Li L, Ganss C, Yard B, Magdeburg R, Frank MH, Pallavi P, Keese M. ABCB5 + mesenchymal stromal cells therapy protects from hypoxia by restoring Ca 2+ homeostasis in vitro and in vivo. Stem Cell Res Ther 2023; 14:24. [PMID: 36759868 PMCID: PMC9912525 DOI: 10.1186/s13287-022-03228-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 12/21/2022] [Indexed: 02/11/2023] Open
Abstract
BACKGROUND Hypoxia in ischemic disease impairs Ca2+ homeostasis and may promote angiogenesis. The therapeutic efficacy of mesenchymal stromal cells (MSCs) in peripheral arterial occlusive disease is well established, yet its influence on cellular Ca2+ homeostasis remains to be elucidated. We addressed the influence of ATP-binding cassette subfamily B member 5 positive mesenchymal stromal cells (ABCB5+ MSCs) on Ca2+ homeostasis in hypoxic human umbilical vein endothelial cells (HUVECs) in vitro and in vivo. METHODS Hypoxia was induced in HUVECs by Cobalt (II) chloride (CoCl2) or Deferoxamine (DFO). Dynamic changes in the cytosolic- and endoplasmic reticulum (ER) Ca2+ and changes in reactive oxygen species were assessed by appropriate fluorescence-based sensors. Metabolic activity, cell migration, and tube formation were assessed by standard assays. Acute-on-chronic ischemia in Apolipoprotein E knock-out (ApoE-/-) mice was performed by double ligation of the right femoral artery (DFLA). ABCB5+ MSC cells were injected into the ischemic limb. Functional recovery after DFLA and histology of gastrocnemius and aorta were assessed. RESULTS Hypoxia-induced impairment of cytosolic and ER Ca2+ were restored by ABCB5+ MSCs or their conditioned medium. Similar was found for changes in intracellular ROS production, metabolic activity, migratory ability and tube formation. The restoration was paralleled by an increased expression of the Ca2+ transporter Sarco-/endoplasmic reticulum ATPase 2a (SERCA2a) and the phosphorylation of Phospholamban (PLN). In acute-on-chronic ischemia, ABCB5+ MSCs treated mice showed a higher microvascular density, increased SERCA2a expression and PLN phosphorylation relative to untreated controls. CONCLUSIONS ABCB5+ MSCs therapy can restore cellular Ca2+ homeostasis, which may beneficially affect the angiogenic function of endothelial cells under hypoxia in vitro and in vivo.
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Affiliation(s)
- Kaixuan Yan
- grid.7700.00000 0001 2190 4373Department of Surgery, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany ,grid.7700.00000 0001 2190 4373European Center of Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Jiaxing Zheng
- grid.7700.00000 0001 2190 4373Department of Surgery, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany ,grid.7700.00000 0001 2190 4373European Center of Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | | | - Lin Li
- grid.7700.00000 0001 2190 4373Department of Surgery, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany ,grid.7700.00000 0001 2190 4373European Center of Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Christoph Ganss
- TICEBA GmbH, Heidelberg, Germany ,grid.476673.7RHEACELL GmbH & Co. KG, Heidelberg, Germany
| | - Benito Yard
- grid.7700.00000 0001 2190 4373V Department of Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Richard Magdeburg
- grid.411778.c0000 0001 2162 1728Department of Surgery, University Hospital Mannheim, Theodor-Kutzer-Ufer 1-3, 68161 Mannheim, Germany
| | - Markus H. Frank
- grid.38142.3c000000041936754XDepartment of Dermatology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA USA ,grid.38142.3c000000041936754XTransplant Research Program, Boston Children’s Hospital, Harvard Medical School, Boston, MA USA ,grid.38142.3c000000041936754XHarvard Stem Cell Institute, Harvard University, Cambridge, MA USA ,grid.1038.a0000 0004 0389 4302School of Medical and Health Sciences, Edith Cowan University, Perth, WA Australia
| | - Prama Pallavi
- Department of Surgery, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. .,European Center of Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. .,Department of Surgery, University Hospital Mannheim, Theodor-Kutzer-Ufer 1-3, 68161, Mannheim, Germany.
| | - Michael Keese
- Department of Surgery, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. .,European Center of Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. .,Department for General and Visceral Surgery, Theresienkrankenhaus Mannheim, Mannheim, Germany. .,Department of Surgery, University Hospital Mannheim, Theodor-Kutzer-Ufer 1-3, 68161, Mannheim, Germany.
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5
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Hypoxia damages endothelial cell angiogenic function by reducing the Ca2+ restoring ability of the endoplasmic reticulum. Biochem Biophys Res Commun 2022; 626:142-150. [DOI: 10.1016/j.bbrc.2022.07.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Revised: 07/22/2022] [Accepted: 07/27/2022] [Indexed: 11/21/2022]
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6
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Ustyantseva E, Pavlova SV, Malakhova AA, Ustyantsev K, Zakian SM, Medvedev SP. Oxidative stress monitoring in iPSC-derived motor neurons using genetically encoded biosensors of H 2O 2. Sci Rep 2022; 12:8928. [PMID: 35624228 PMCID: PMC9142597 DOI: 10.1038/s41598-022-12807-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 05/05/2022] [Indexed: 11/13/2022] Open
Abstract
Oxidative stress plays an important role in the development of neurodegenerative diseases, being either the initiator or part of a pathological cascade that leads to the neuron’s death. Genetically encoded biosensors of oxidative stress demonstrated their general functionality and overall safety in various systems. However, there is still insufficient data regarding their use in the research of disease-related phenotypes in relevant model systems, such as human cells. Here, we establish an approach for monitoring the redox state of live motor neurons with SOD1 mutations associated with amyotrophic lateral sclerosis. Using CRISPR/Cas9, we insert genetically encoded biosensors of cytoplasmic and mitochondrial H2O2 in the genome of induced pluripotent stem cell (iPSC) lines. We demonstrate that the biosensors remain functional in motor neurons derived from these iPSCs and reflect the differences in the stationary redox state of the neurons with different genotypes. Moreover, we show that the biosensors respond to alterations in motor neuron oxidation caused by either environmental changes or cellular stress. Thus, the obtained platform is suitable for cell-based research of neurodegenerative mechanisms.
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Affiliation(s)
- Elizaveta Ustyantseva
- The Federal Research Center Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10, Lavrentiev Ave, 630090, Novosibirsk, Russia.
| | - Sophia V Pavlova
- The Federal Research Center Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10, Lavrentiev Ave, 630090, Novosibirsk, Russia.,Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, 8, Lavrentiev Ave., 630090, Novosibirsk, Russia.,E. Meshalkin National Medical Research Center of the Ministry of Health of the Russian Federation, 15 Rechkunovskaya Str., 630055, Novosibirsk, Russia
| | - Anastasia A Malakhova
- The Federal Research Center Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10, Lavrentiev Ave, 630090, Novosibirsk, Russia.,Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, 8, Lavrentiev Ave., 630090, Novosibirsk, Russia.,E. Meshalkin National Medical Research Center of the Ministry of Health of the Russian Federation, 15 Rechkunovskaya Str., 630055, Novosibirsk, Russia
| | - Kirill Ustyantsev
- The Federal Research Center Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10, Lavrentiev Ave, 630090, Novosibirsk, Russia
| | - Suren M Zakian
- The Federal Research Center Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10, Lavrentiev Ave, 630090, Novosibirsk, Russia.,Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, 8, Lavrentiev Ave., 630090, Novosibirsk, Russia.,E. Meshalkin National Medical Research Center of the Ministry of Health of the Russian Federation, 15 Rechkunovskaya Str., 630055, Novosibirsk, Russia
| | - Sergey P Medvedev
- The Federal Research Center Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10, Lavrentiev Ave, 630090, Novosibirsk, Russia. .,Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, 8, Lavrentiev Ave., 630090, Novosibirsk, Russia. .,E. Meshalkin National Medical Research Center of the Ministry of Health of the Russian Federation, 15 Rechkunovskaya Str., 630055, Novosibirsk, Russia.
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7
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Pena E, El Alam S, Siques P, Brito J. Oxidative Stress and Diseases Associated with High-Altitude Exposure. Antioxidants (Basel) 2022; 11:267. [PMID: 35204150 PMCID: PMC8868315 DOI: 10.3390/antiox11020267] [Citation(s) in RCA: 51] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/11/2022] [Accepted: 01/13/2022] [Indexed: 12/12/2022] Open
Abstract
Several diseases associated with high-altitude exposure affect unacclimated individuals. These diseases include acute mountain sickness (AMS), high-altitude cerebral edema (HACE), high-altitude pulmonary edema (HAPE), chronic mountain sickness (CMS), and, notably, high-altitude pulmonary hypertension (HAPH), which can eventually lead to right ventricle hypertrophy and heart failure. The development of these pathologies involves different molecules and molecular pathways that might be related to oxidative stress. Studies have shown that acute, intermittent, and chronic exposure to hypobaric hypoxia induce oxidative stress, causing alterations to molecular pathways and cellular components (lipids, proteins, and DNA). Therefore, the aim of this review is to discuss the oxidative molecules and pathways involved in the development of high-altitude diseases. In summary, all high-altitude pathologies are related to oxidative stress, as indicated by increases in the malondialdehyde (MDA) biomarker and decreases in superoxide dismutase (SOD) and glutathione peroxidase (GPx) antioxidant activity. In addition, in CMS, the levels of 8-iso-PGF2α and H2O2 are increased, and evidence strongly indicates an increase in Nox4 activity in HAPH. Therefore, antioxidant treatments seem to be a promising approach to mitigating high-altitude pathologies.
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Affiliation(s)
- Eduardo Pena
- Institute of Health Studies, Arturo Prat University, Iquique 1100000, Chile; (E.P.); (P.S.); (J.B.)
| | - Samia El Alam
- Institute of Health Studies, Arturo Prat University, Iquique 1100000, Chile; (E.P.); (P.S.); (J.B.)
| | - Patricia Siques
- Institute of Health Studies, Arturo Prat University, Iquique 1100000, Chile; (E.P.); (P.S.); (J.B.)
| | - Julio Brito
- Institute of Health Studies, Arturo Prat University, Iquique 1100000, Chile; (E.P.); (P.S.); (J.B.)
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8
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Air Plasma-Activated Medium Evokes a Death-Associated Perinuclear Mitochondrial Clustering. Int J Mol Sci 2022; 23:ijms23031124. [PMID: 35163042 PMCID: PMC8835529 DOI: 10.3390/ijms23031124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/14/2022] [Accepted: 01/17/2022] [Indexed: 12/01/2022] Open
Abstract
Intractable cancers such as osteosarcoma (OS) and oral cancer (OC) are highly refractory, recurrent, and metastatic once developed, and their prognosis is still disappointing. Tumor-targeted therapy, which eliminates cancers effectively and safely, is the current clinical choice. Since aggressive tumors are substantially resistant to multidisciplinary therapies that target apoptosis, tumor-specific activation of another cell death modality is a promising avenue for meeting this goal. Here, we report that a cold atmospheric air plasma-activated medium (APAM) can kill OS and OC by causing a unique mitochondrial clustering. This event was named monopolar perinuclear mitochondrial clustering (MPMC) based on its characteristic unipolar mitochondrial perinuclear accumulation. The APAM caused apoptotic and nonapoptotic cell death. The APAM increased mitochondrial ROS (mROS) and cell death, and the antioxidants such as N-acetylcysteine (NAC) prevented them. MPMC occurred following mitochondrial fragmentation, which coincided with nuclear damages. MPMC was accompanied by mitochondrial lipid peroxide (mLPO) accumulation and prevented by NAC, Ferrostatin-1, and Nocodazole. In contrast, the APAM induced minimal cell death, mROS generation, mLPO accumulation, and MPMC in fibroblasts. These results suggest that MPMC occurs in a tumor-specific manner via mitochondrial oxidative stress and microtubule-driven mitochondrial motility. MPMC induction might serve as a promising target for exerting tumor-specific cytotoxicity.
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9
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Shimoda LA, Suresh K, Undem C, Jiang H, Yun X, Sylvester JT, Swenson ER. Acetazolamide prevents hypoxia-induced reactive oxygen species generation and calcium release in pulmonary arterial smooth muscle. Pulm Circ 2021; 11:20458940211049948. [PMID: 34646499 PMCID: PMC8504243 DOI: 10.1177/20458940211049948] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 09/13/2021] [Indexed: 11/16/2022] Open
Abstract
Upon sensing a reduction in local oxygen partial pressure, pulmonary vessels constrict, a phenomenon known as hypoxic pulmonary vasoconstriction. Excessive hypoxic pulmonary vasoconstriction can occur with ascent to high altitude and is a contributing factor to the development of high-altitude pulmonary edema. The carbonic anhydrase inhibitor, acetazolamide, attenuates hypoxic pulmonary vasoconstriction through stimulation of alveolar ventilation via modulation of acid-base homeostasis and by direct effects on pulmonary vascular smooth muscle. In pulmonary arterial smooth muscle cells (PASMCs), acetazolamide prevents hypoxia-induced increases in intracellular calcium concentration ([Ca2+]i), although the exact mechanism by which this occurs is unknown. In this study, we explored the effect of acetazolamide on various calcium-handling pathways in PASMCs. Using fluorescent microscopy, we tested whether acetazolamide directly inhibited store-operated calcium entry or calcium release from the sarcoplasmic reticulum, two well-documented sources of hypoxia-induced increases in [Ca2+]i in PASMCs. Acetazolamide had no effect on calcium entry stimulated by store-depletion, nor on calcium release from the sarcoplasmic reticulum induced by either phenylephrine to activate inositol triphosphate receptors or caffeine to activate ryanodine receptors. In contrast, acetazolamide completely prevented Ca2+-release from the sarcoplasmic reticulum induced by hypoxia (4% O2). Since these results suggest the acetazolamide interferes with a mechanism upstream of the inositol triphosphate and ryanodine receptors, we also determined whether acetazolamide might prevent hypoxia-induced changes in reactive oxygen species production. Using roGFP, a ratiometric reactive oxygen species-sensitive fluorescent probe, we found that hypoxia caused a significant increase in reactive oxygen species in PASMCs that was prevented by 100 μM acetazolamide. Together, these results suggest that acetazolamide prevents hypoxia-induced changes in [Ca2+]i by attenuating reactive oxygen species production and subsequent activation of Ca2+-release from sarcoplasmic reticulum stores.
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Affiliation(s)
- Larissa A Shimoda
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Karthik Suresh
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Clark Undem
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Haiyang Jiang
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Xin Yun
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - J T Sylvester
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Erik R Swenson
- Division of Pulmonary and Critical Care Medicine, VA Puget Sound Health Care System and University of Washington School of Medicine, St. Louis, MO, USA
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10
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Pang Y, Zhang H, Ai HW. Genetically Encoded Fluorescent Redox Indicators for Unveiling Redox Signaling and Oxidative Toxicity. Chem Res Toxicol 2021; 34:1826-1845. [PMID: 34284580 DOI: 10.1021/acs.chemrestox.1c00149] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Redox-active molecules play essential roles in cell homeostasis, signaling, and other biological processes. Dysregulation of redox signaling can lead to toxic effects and subsequently cause diseases. Therefore, real-time tracking of specific redox-signaling molecules in live cells would be critical for deciphering their functional roles in pathophysiology. Fluorescent protein (FP)-based genetically encoded redox indicators (GERIs) have emerged as valuable tools for monitoring the redox states of various redox-active molecules from subcellular compartments to live organisms. In the first section of this review, we overview the background, focusing on the sensing mechanisms of various GERIs. Next, we review a list of selected GERIs according to their analytical targets and discuss their key biophysical and biochemical properties. In the third section, we provide several examples which applied GERIs to understanding redox signaling and oxidative toxicology in pathophysiological processes. Lastly, a summary and outlook section is included.
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Affiliation(s)
- Yu Pang
- Center for Membrane and Cell Physiology, University of Virginia, Charlottesville, Virginia 22908, United States.,Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Hao Zhang
- Center for Membrane and Cell Physiology, University of Virginia, Charlottesville, Virginia 22908, United States.,Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Hui-Wang Ai
- Center for Membrane and Cell Physiology, University of Virginia, Charlottesville, Virginia 22908, United States.,Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States.,Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia 22908, United States.,The UVA Cancer Center, University of Virginia, Charlottesville, Virginia 22908, United States
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11
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Layous M, Khalaily L, Gildor T, Ben-Tabou de-Leon S. The tolerance to hypoxia is defined by a time-sensitive response of the gene regulatory network in sea urchin embryos. Development 2021; 148:dev.195859. [PMID: 33795230 PMCID: PMC8077511 DOI: 10.1242/dev.195859] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 03/22/2021] [Indexed: 12/12/2022]
Abstract
Deoxygenation, the reduction of oxygen level in the oceans induced by global warming and anthropogenic disturbances, is a major threat to marine life. This change in oxygen level could be especially harmful to marine embryos that use endogenous hypoxia and redox gradients as morphogens during normal development. Here, we show that the tolerance to hypoxic conditions changes between different developmental stages of the sea urchin embryo, possibly due to the structure of the gene regulatory networks (GRNs). We demonstrate that during normal development, the bone morphogenetic protein (BMP) pathway restricts the activity of the vascular endothelial growth factor (VEGF) pathway to two lateral domains and this restriction controls proper skeletal patterning. Hypoxia applied during early development strongly perturbs the activity of Nodal and BMP pathways that affect the VEGF pathway, dorsal-ventral (DV) and skeletogenic patterning. These pathways are largely unaffected by hypoxia applied after DV-axis formation. We propose that the use of redox and hypoxia as morphogens makes the sea urchin embryo highly sensitive to environmental hypoxia during early development, but the GRN structure provides higher tolerance to hypoxia at later stages. Summary: The use of hypoxia and redox gradients as morphogens makes sea urchin early development sensitive to environmental hypoxia. This sensitivity decreases later, possibly due to the gene regulatory network structure.
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Affiliation(s)
- Majed Layous
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa 31905, Israel
| | - Lama Khalaily
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa 31905, Israel
| | - Tsvia Gildor
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa 31905, Israel
| | - Smadar Ben-Tabou de-Leon
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa 31905, Israel
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12
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Rudyk O, Aaronson PI. Redox Regulation, Oxidative Stress, and Inflammation in Group 3 Pulmonary Hypertension. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1303:209-241. [PMID: 33788196 DOI: 10.1007/978-3-030-63046-1_13] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Group 3 pulmonary hypertension (PH), which occurs secondary to hypoxia lung diseases, is one of the most common causes of PH worldwide and has a high unmet clinical need. A deeper understanding of the integrative pathological and adaptive molecular mechanisms within this group is required to inform the development of novel drug targets and effective treatments. The production of oxidants is increased in PH Group 3, and their pleiotropic roles include contributing to disease progression by promoting prolonged hypoxic pulmonary vasoconstriction and pathological pulmonary vascular remodeling, but also stimulating adaptation to pathological stress that limits the severity of this disease. Inflammation, which is increasingly being viewed as a key pathological feature of Group 3 PH, is subject to complex regulation by redox mechanisms and is exacerbated by, but also augments oxidative stress. In this review, we investigate aspects of this complex crosstalk between inflammation and oxidative stress in Group 3 PH, focusing on the redox-regulated transcription factor NF-κB and its upstream regulators toll-like receptor 4 and high mobility group box protein 1. Ultimately, we propose that the development of specific therapeutic interventions targeting redox-regulated signaling pathways related to inflammation could be explored as novel treatments for Group 3 PH.
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Affiliation(s)
- Olena Rudyk
- School of Cardiovascular Medicine & Sciences, King's College London, British Heart Foundation Centre of Research Excellence, London, UK.
| | - Philip I Aaronson
- School of Immunology and Microbial Sciences, King's College London, London, UK
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13
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Stem cell plasticity and regenerative potential regulation through Ca 2+-mediated mitochondrial nuclear crosstalk. Mitochondrion 2020; 56:1-14. [PMID: 33059088 DOI: 10.1016/j.mito.2020.10.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 09/03/2020] [Accepted: 10/05/2020] [Indexed: 02/07/2023]
Abstract
The multi-lineage differentiation potential is one of the prominent mechanisms through which stem cells can repair damaged tissues. The regenerative potential of stem cells is the manifestation of several changes at the structural and molecular levels in stem cells that are regulated through intricate mitochondrial-nuclear interactions maintained by Ca2+ ion signaling. Despite the exhilarating evidences strengthening the versatile and indispensible role of Ca2+ in regulating mitochondrial-nuclear interactions, the extensive details of signaling mechanisms remains largely unexplored. In this review we have discussed the effect of Ca2+ ion mediated mitochondrial-nuclear interactions participating in stem plasticity and its regenerative potential.
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14
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Na + controls hypoxic signalling by the mitochondrial respiratory chain. Nature 2020; 586:287-291. [PMID: 32728214 DOI: 10.1038/s41586-020-2551-y] [Citation(s) in RCA: 139] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 05/05/2020] [Indexed: 12/18/2022]
Abstract
All metazoans depend on the consumption of O2 by the mitochondrial oxidative phosphorylation system (OXPHOS) to produce energy. In addition, the OXPHOS uses O2 to produce reactive oxygen species that can drive cell adaptations1-4, a phenomenon that occurs in hypoxia4-8 and whose precise mechanism remains unknown. Ca2+ is the best known ion that acts as a second messenger9, yet the role ascribed to Na+ is to serve as a mere mediator of membrane potential10. Here we show that Na+ acts as a second messenger that regulates OXPHOS function and the production of reactive oxygen species by modulating the fluidity of the inner mitochondrial membrane. A conformational shift in mitochondrial complex I during acute hypoxia11 drives acidification of the matrix and the release of free Ca2+ from calcium phosphate (CaP) precipitates. The concomitant activation of the mitochondrial Na+/Ca2+ exchanger promotes the import of Na+ into the matrix. Na+ interacts with phospholipids, reducing inner mitochondrial membrane fluidity and the mobility of free ubiquinone between complex II and complex III, but not inside supercomplexes. As a consequence, superoxide is produced at complex III. The inhibition of Na+ import through the Na+/Ca2+ exchanger is sufficient to block this pathway, preventing adaptation to hypoxia. These results reveal that Na+ controls OXPHOS function and redox signalling through an unexpected interaction with phospholipids, with profound consequences for cellular metabolism.
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15
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Li X, Zhang Q, Nasser MI, Xu L, Zhang X, Zhu P, He Q, Zhao M. Oxygen homeostasis and cardiovascular disease: A role for HIF? Biomed Pharmacother 2020; 128:110338. [PMID: 32526454 DOI: 10.1016/j.biopha.2020.110338] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 05/27/2020] [Accepted: 05/30/2020] [Indexed: 12/17/2022] Open
Abstract
Hypoxia, the decline of tissue oxygen stress, plays a role in mediating cellular processes. Cardiovascular disease, relatively widespread with increased mortality, is closely correlated with oxygen homeostasis regulation. Besides, hypoxia-inducible factor-1(HIF-1) is reported to be a crucial component in regulating systemic hypoxia-induced physiological and pathological modifications like oxidative stress, damage, angiogenesis, vascular remodeling, inflammatory reaction, and metabolic remodeling. In addition, HIF1 controls the movement, proliferation, apoptosis, differentiation and activity of numerous core cells, such as cardiomyocytes, endothelial cells (ECs), smooth muscle cells (SMCs), and macrophages. Here we review the molecular regulation of HIF-1 in cardiovascular diseases, intended to improve therapeutic approaches for clinical diagnoses. Better knowledge of the oxygen balance control and the signal mechanisms involved is important to advance the development of hypoxia-related diseases.
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Affiliation(s)
- Xinyu Li
- Department of Pediatrics, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, China; Xiangya School of Medicine, Central South University, Changsha, Hunan Province 410013, China
| | - Quyan Zhang
- Department of Pediatrics, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, China; Xiangya School of Medicine, Central South University, Changsha, Hunan Province 410013, China
| | - M I Nasser
- Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510100, China
| | - Linyong Xu
- Xiangya School of Life Science, Central South University, Changsha, Hunan Province 410013, China
| | - Xueyan Zhang
- Department of Pediatrics, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, China; Xiangya School of Medicine, Central South University, Changsha, Hunan Province 410013, China
| | - Ping Zhu
- Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510100, China.
| | - Qingnan He
- Department of Pediatrics, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, China.
| | - Mingyi Zhao
- Department of Pediatrics, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, China.
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16
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Yang Z, Song T, Truong L, Reyes-García J, Wang L, Zheng YM, Wang YX. Important Role of Sarcoplasmic Reticulum Ca 2+ Release via Ryanodine Receptor-2 Channel in Hypoxia-Induced Rieske Iron-Sulfur Protein-Mediated Mitochondrial Reactive Oxygen Species Generation in Pulmonary Artery Smooth Muscle Cells. Antioxid Redox Signal 2020; 32:447-462. [PMID: 31456413 PMCID: PMC6987675 DOI: 10.1089/ars.2018.7652] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Aims: It is known that mitochondrial reactive oxygen species generation ([ROS]m) causes the release of Ca2+via ryanodine receptor-2 (RyR2) on the sarcoplasmic reticulum (SR) in pulmonary artery smooth muscle cells (PASMCs), playing an essential role in hypoxic pulmonary vasoconstriction (HPV). In this study, we sought to determine whether hypoxia-induced RyR2-mediated Ca2+ release may in turn promote [ROS]m in PASMCs and the underlying signaling mechanism. Results: Our data reveal that application of caffeine or norepinephrine to induce Ca2+ release increased [ROS]m in PASMCs. Likewise, exogenous Ca2+ augmented ROS generation in isolated mitochondria and at complex III from PASMCs. Inhibition of mitochondrial Ca2+ uniporter (MCU) with Ru360 attenuated agonist-induced [ROS]m. Ru360 produced a similar inhibitory effect on hypoxia-induced [ROS]m. Rieske iron-sulfur protein (RISP) gene knockdown inhibited Ca2+- and caffeine-induced [ROS]m. Inhibition of RyR2 by tetracaine or RyR2 gene knockout suppressed hypoxia-induced [ROS]m as well. Innovation: In this article, we present convincing evidence that Ca2+ release following hypoxia or RyR simulation causes a significant increase in MCU, and the increased MCU subsequently RISP-dependent [ROS]m, which provides a positive feedback mechanism to enhance hypoxia-initiated [ROS]m in PASMCs. Conclusion: Our findings demonstrate that hypoxia-induced mitochondrial ROS-dependent SR RyR2-mediated Ca2+ release increases MCU and then RISP-dependent [ROS]m in PASMCs, which may make significant contributions to HPV and associated pulmonary hypertension.
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Affiliation(s)
- Zhao Yang
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York.,Department of Respiratory Medicine, Suzhou Science & Technology Town Hospital, Suzhou, China
| | - Tengyao Song
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York
| | - Lillian Truong
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York
| | - Jorge Reyes-García
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York
| | - Lan Wang
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York
| | - Yun-Min Zheng
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York
| | - Yong-Xiao Wang
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York
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17
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Bailey KE, Pino C, Lennon ML, Lyons A, Jacot JG, Lammers SR, Königshoff M, Magin CM. Embedding of Precision-Cut Lung Slices in Engineered Hydrogel Biomaterials Supports Extended Ex Vivo Culture. Am J Respir Cell Mol Biol 2020; 62:14-22. [PMID: 31513744 PMCID: PMC6938134 DOI: 10.1165/rcmb.2019-0232ma] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 09/12/2019] [Indexed: 01/03/2023] Open
Abstract
Maintaining the three-dimensional architecture and cellular complexity of lung tissue ex vivo can enable elucidation of the cellular and molecular pathways underlying chronic pulmonary diseases. Precision-cut lung slices (PCLS) are one human-lung model with the potential to support critical mechanistic studies and early drug discovery. However, many studies report short culture times of 7-10 days. Here, we systematically evaluated poly(ethylene glycol)-based hydrogel platforms for the encapsulation of PCLS. We demonstrated the ability to support ex vivo culture of embedded PCLS for at least 21 days compared with control PCLS floating in media. These customized hydrogels maintained PCLS architecture (no difference), viability (4.7-fold increase, P < 0.0001), and cellular phenotype as measured by SFTPC (1.8-fold increase, P < 0.0001) and vimentin expression (no change) compared with nonencapsulated controls. Collectively, these results demonstrate that hydrogel biomaterials support the extended culture times required to study chronic pulmonary diseases ex vivo using PCLS technology.
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Affiliation(s)
- Kolene E. Bailey
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine and
| | - Christopher Pino
- Department of Bioengineering, University of Colorado, Aurora, Colorado
| | - Mallory L. Lennon
- Department of Bioengineering, University of Colorado, Aurora, Colorado
| | - Anne Lyons
- Department of Bioengineering, University of Colorado, Aurora, Colorado
| | - Jeffrey G. Jacot
- Department of Bioengineering, University of Colorado, Aurora, Colorado
| | - Steven R. Lammers
- Department of Bioengineering, University of Colorado, Aurora, Colorado
| | - Melanie Königshoff
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine and
| | - Chelsea M. Magin
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine and
- Department of Bioengineering, University of Colorado, Aurora, Colorado
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18
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Ko CL, Lin JA, Chen KY, Hsu AC, Wu SY, Tai YT, Lin KH, Chung WC, Li MH. Netrin-1 Dampens Hypobaric Hypoxia-Induced Lung Injury in Mice. High Alt Med Biol 2019; 20:293-302. [PMID: 31329475 DOI: 10.1089/ham.2018.0116] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Background: This study aimed to explore the effects of netrin-1 on hypobaric hypoxia-induced lung injury in mice. Methods: We exposed 6-8-week-old C57BL/6 mice to hypobaric stress at 340 mmHg for 30 minutes followed by 260 mmHg for different periods (6, 12, 18, and 24 hours) to observe the severity of lung injury (O2 concentration, 21%; 54.6 mmHg). The wet/dry weight ratio and protein leakage from the mouse lung were used to determine the suitable exposure time. Netrin-1 was injected into the tail vein of mice before 18-hour decompression. Inflammatory cytokines, lung injury scores, and activity of nuclear factor κB were evaluated. The expression of apoptosis-related proteins was also examined. Results: Protein concentration in the bronchoalveolar lavage fluid was significantly higher in the 18-hour group (p < 0.05). Pulmonary pathology revealed neutrophil infiltration, alveolar septum thickening, and tissue edema. Injury score and macrophage inflammatory protein 2 levels were also increased. Intrinsic apoptosis pathway was activated. Hypoxia decreased the expression of Bcl2 protein, the number of active caspase-3-stained cells, and UNC5HB receptors. Pretreatment with netrin-1 reduced protein leakage, inhibited neutrophil migration, lowered the injury score, attenuated apoptosis, and increased UNC5HB receptor expression. Conclusion: Netrin-1 dampens hypobaric hypoxia-induced lung injury by inhibiting neutrophil migration and attenuating apoptosis.
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Affiliation(s)
- Ching-Lung Ko
- Department of Anesthesiology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Jui-An Lin
- Department of Anesthesiology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,Department of Anesthesiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Kung-Yen Chen
- Department of Anesthesiology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - An-Chih Hsu
- Department of Anesthesiology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Shu-Yu Wu
- Institute of Aerospace and Undersea Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Yu-Ting Tai
- Department of Anesthesiology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,Department of Anesthesiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Ko-Huan Lin
- Division of Psychiatry, Hualien Armed Forces General Hospital, Hualien, Taiwan
| | - Wei-Chen Chung
- Department of Anesthesiology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Min-Hui Li
- Department of Physical Medicine and Rehabilitation, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
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19
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Branco MA, Cotovio JP, Rodrigues CAV, Vaz SH, Fernandes TG, Moreira LM, Cabral JMS, Diogo MM. Transcriptomic analysis of 3D Cardiac Differentiation of Human Induced Pluripotent Stem Cells Reveals Faster Cardiomyocyte Maturation Compared to 2D Culture. Sci Rep 2019; 9:9229. [PMID: 31239450 PMCID: PMC6592905 DOI: 10.1038/s41598-019-45047-9] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 05/30/2019] [Indexed: 12/11/2022] Open
Abstract
Human induced pluripotent stem cells (hiPSCs) represent an almost limitless source of cells for disease modelling and drug screening applications. Here we established an efficient and robust 3D platform for cardiomyocyte (CMs) production from hiPSCs, solely through small-molecule-based temporal modulation of the Wnt signalling, which generates more than 90% cTNT+ cells. The impact of performing the differentiation process in 3D conditions as compared to a 2D culture system, was characterized by transcriptomic analysis by using data collected from sequential stages of 2D and 3D culture. We highlight that performing an initial period of hiPSC aggregation before cardiac differentiation primed hiPSCs towards an earlier mesendoderm lineage differentiation, via TGF-β/Nodal signaling stabilization. Importantly, it was also found that CMs in the 3D microenvironment mature earlier and show an improved communication system, which we suggested to be responsible for a higher structural and functional maturation of 3D cardiac aggregates.
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Affiliation(s)
- Mariana A Branco
- Department of Bioengineering and iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal
| | - João P Cotovio
- Department of Bioengineering and iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal
| | - Carlos A V Rodrigues
- Department of Bioengineering and iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal
| | - Sandra H Vaz
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028, Lisbon, Portugal.,Instituto de Farmacologia e Neurociências, Faculdade de Medicina da Universidade de Lisboa, 1649-028, Lisbon, Portugal
| | - Tiago G Fernandes
- Department of Bioengineering and iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal
| | - Leonilde M Moreira
- Department of Bioengineering and iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal
| | - Joaquim M S Cabral
- Department of Bioengineering and iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal
| | - Maria Margarida Diogo
- Department of Bioengineering and iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal. .,The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisbon, Portugal.
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20
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Smith KA, Schumacker PT. Sensors and signals: the role of reactive oxygen species in hypoxic pulmonary vasoconstriction. J Physiol 2018; 597:1033-1043. [PMID: 30091476 DOI: 10.1113/jp275852] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 07/20/2018] [Indexed: 12/12/2022] Open
Abstract
When lung cells experience hypoxia, the functional response, termed hypoxic pulmonary vasoconstriction, activates a multitude of pathways with the goal of optimizing gas exchange. While previously controversial, overwhelming evidence now suggests that increased reactive oxygen species - produced at complex III of the mitochondrial electron transport chain and released into the intermembrane space - is the cellular oxygen signal responsible for triggering hypoxic pulmonary vasoconstriction. The increased reactive oxygen species (ROS) activate many downstream targets that ultimately lead to increased intracellular ionized calcium concentration and contraction of pulmonary arterial smooth muscle cells. While the specific targets of ROS signals are not completely understood, it is clear that this signalling pathway is critical for development and for normal lung function in newborns and adults.
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Affiliation(s)
- Kimberly A Smith
- Department of Pediatrics, Division of Neonatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Paul T Schumacker
- Department of Pediatrics, Division of Neonatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
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21
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Cho HJ, Kim CH. Oxygen matters: hypoxia as a pathogenic mechanism in rhinosinusitis. BMB Rep 2018; 51:59-64. [PMID: 29366441 PMCID: PMC5836558 DOI: 10.5483/bmbrep.2018.51.2.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Indexed: 12/21/2022] Open
Abstract
The airway epithelium is the first place, where a defense mechanism is initiated against environmental stimuli. Mucociliary transport (MCT), which is the defense mechanism of the airway and the role of airway epithelium as mechanical barriers are essential in innate immunity. To maintain normal physiologic function, normal oxygenation is critical for the production of energy for optimal cellular functions. Several pathologic conditions are associated with a decrease in oxygen tension in airway epithelium and chronic sinusitis is one of the airway diseases, which is associated with the hypoxic condition, a potent inflammatory stimulant. We have observed the overexpression of the hypoxia-inducible factor 1 (HIF-1), an essential factor for oxygen homeostasis, in the epithelium of sinus mucosa in sinusitis patients. In a series of previous reports, we have found hypoxia-induced mucus hyperproduction, especially by MUC5AC hyperproduction, disruption of epithelial barrier function by the production of VEGF, and down-regulation of junctional proteins such as ZO-1 and E-cadherin. Furthermore, hypoxia-induced inflammation by HMGB1 translocation into the cytoplasm results in the release of IL-8 through a ROS-dependent mechanism in upper airway epithelium. In this mini-review, we briefly introduce and summarize current progress in the pathogenesis of sinusitis related to hypoxia. The investigation of hypoxia-related pathophysiology in airway epithelium will suggest new insights on airway inflammatory diseases, such as rhinosinusitis for clinical application and drug development.
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Affiliation(s)
- Hyung-Ju Cho
- Department of Otorhinolaryngology, and The Airway Mucus Institute, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Chang-Hoon Kim
- Department of Otorhinolaryngology, and The Airway Mucus Institute, Yonsei University College of Medicine, Seoul 03722, Korea
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22
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Siques P, Brito J, Pena E. Reactive Oxygen Species and Pulmonary Vasculature During Hypobaric Hypoxia. Front Physiol 2018; 9:865. [PMID: 30050455 PMCID: PMC6052911 DOI: 10.3389/fphys.2018.00865] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 06/18/2018] [Indexed: 12/12/2022] Open
Abstract
An increasing number of people are living or working at high altitudes (hypobaric hypoxia) and therefore suffering several physiological, biochemical, and molecular changes. Pulmonary vasculature is one of the main and first responses to hypoxia. These responses imply hypoxic pulmonary vasoconstriction (HPV), remodeling, and eventually pulmonary hypertension (PH). These events occur according to the type and extension of the exposure. There is also increasing evidence that these changes in the pulmonary vascular bed could be mainly attributed to a homeostatic imbalance as a result of increased levels of reactive oxygen species (ROS). The increase in ROS production during hypobaric hypoxia has been attributed to an enhanced activity and expression of nicotinamide adenine dinucleotide phosphate oxidase (NADPH oxidase), though there is some dispute about which subunit is involved. This enzymatic complex may be directly induced by hypoxia-inducible factor-1α (HIF-1α). ROS has been found to be related to several pathways, cells, enzymes, and molecules in hypoxic pulmonary vasculature responses, from HPV to inflammation, and structural changes, such as remodeling and, ultimately, PH. Therefore, we performed a comprehensive review of the current evidence on the role of ROS in the development of pulmonary vasculature changes under hypoxic conditions, with a focus on hypobaric hypoxia. This review provides information supporting the role of oxidative stress (mainly ROS) in the pulmonary vasculature’s responses under hypobaric hypoxia and depicting possible future therapeutics or research targets. NADPH oxidase-produced oxidative stress is highlighted as a major source of ROS. Moreover, new molecules, such as asymmetric dimethylarginine, and critical inflammatory cells as fibroblasts, could be also involved. Several controversies remain regarding the role of ROS and the mechanisms involved in hypoxic responses that need to be elucidated.
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Affiliation(s)
- Patricia Siques
- Institute of Health Studies, Arturo Prat University, Iquique, Chile
| | - Julio Brito
- Institute of Health Studies, Arturo Prat University, Iquique, Chile
| | - Eduardo Pena
- Institute of Health Studies, Arturo Prat University, Iquique, Chile
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23
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Esposito S, Masala A, Sanna S, Rassu M, Pimxayvong V, Iaccarino C, Crosio C. Redox-sensitive GFP to monitor oxidative stress in neurodegenerative diseases. Rev Neurosci 2018; 28:133-144. [PMID: 28030361 DOI: 10.1515/revneuro-2016-0041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 10/02/2016] [Indexed: 02/06/2023]
Abstract
Redox processes are key events in the degenerative cascade of many adult-onset neurodegenerative diseases (NDs), but the biological relevance of a single redox change is often dependent on the redox couple involved and on its subcellular origin. The biosensors based on engineered fluorescent proteins (redox-sensitive GFP [roGFP]) offer a unique opportunity to monitor redox changes in both physiological and pathological contexts in living animals and plants. Here, we review the use of roGFPs to monitor oxidative stress in different three adult-onset NDs: Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS). Despite the many differences spanning from incidence to onset, the hypotheses on biological processes underlying both sporadic and familiar ND forms in humans outline a model in which noncompeting mechanisms are likely to converge in various unsuccessful patterns to mediate the selective degeneration of a specific neuronal population. roGFPs, targeted to different cell compartments, are successfully used as specific markers of cell toxicity, induced by expression of causative genes linked to a determined ND. We also report the use of roGFP to monitor oxidative stress induced by the expression of the ALS-causative gene SOD1.
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24
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Byrne MB, Leslie MT, Patel HS, Gaskins HR, Kenis PJA. Design considerations for open-well microfluidic platforms for hypoxic cell studies. BIOMICROFLUIDICS 2017; 11:054116. [PMID: 29152027 PMCID: PMC5659862 DOI: 10.1063/1.4998579] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 10/03/2017] [Indexed: 05/24/2023]
Abstract
Regions of hypoxia are common in solid tumors and are associated with enhanced malignancy, metastasis, and chemo/radio resistance. Real-time hypoxic cellular experimentation is challenging due to the constant need for oxygen control. Most microfluidic platforms developed thus far for hypoxic cell studies are burdened by complex design parameters and are difficult to use for uninitiated investigators. However, open-well microfluidic platforms enable short and long term hypoxic cell studies with an ease of use workflow. Specifically, open-well platforms enable manipulation and addition of cells, media, and reagents using a micropipette for hypoxic cell studies in tunable dissolved oxygen concentrations as low 0.3 mg/l. We analyzed design considerations for open-well microfluidic platforms such as media height, membrane thickness, and impermeable barriers to determine their effects on the amount of dissolved oxygen within the platform. The oxygen concentration was determined by experimental measurements and computational simulations. To examine cell behavior under controlled oxygen conditions, hypoxia-induced changes to hypoxia inducible factor activity and the mitochondrial redox environment were studied. A fluorescent reporter construct was used to monitor the stabilization of hypoxia inducible factors 1α and 2α throughout chronic hypoxia. Reporter construct fluorescence intensity inversely correlated with dissolved oxygen in the medium, as expected. Additionally, the glutathione redox poise of the mitochondrial matrix in living cancer cells was monitored throughout acute hypoxia with a genetically encoded redox probe and was observed to undergo a reductive response to hypoxia. Overall, these studies validate an easy to use open-well platform suitable for studying complex cell behaviors in hypoxia.
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Affiliation(s)
| | | | - Heeral S Patel
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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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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26
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Smith KA, Waypa GB, Schumacker PT. Redox signaling during hypoxia in mammalian cells. Redox Biol 2017; 13:228-234. [PMID: 28595160 PMCID: PMC5460738 DOI: 10.1016/j.redox.2017.05.020] [Citation(s) in RCA: 129] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/08/2017] [Accepted: 05/26/2017] [Indexed: 12/18/2022] Open
Abstract
Hypoxia triggers a wide range of protective responses in mammalian cells, which are mediated through transcriptional and post-translational mechanisms. Redox signaling in cells by reactive oxygen species (ROS) such as hydrogen peroxide (H2O2) occurs through the reversible oxidation of cysteine thiol groups, resulting in structural modifications that can change protein function profoundly. Mitochondria are an important source of ROS generation, and studies reveal that superoxide generation by the electron transport chain increases during hypoxia. Other sources of ROS, such as the NAD(P)H oxidases, may also generate oxidant signals in hypoxia. This review considers the growing body of work indicating that increased ROS signals during hypoxia are responsible for regulating the activation of protective mechanisms in diverse cell types.
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Affiliation(s)
- Kimberly A Smith
- Department of Pediatrics, Division of Neonatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Gregory B Waypa
- Department of Pediatrics, Division of Neonatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Paul T Schumacker
- Department of Pediatrics, Division of Neonatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
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27
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Min HJ, Kim JH, Yoo JE, Oh JH, Kim KS, Yoon JH, Kim CH. ROS-dependent HMGB1 secretion upregulates IL-8 in upper airway epithelial cells under hypoxic condition. Mucosal Immunol 2017; 10:685-694. [PMID: 27624778 DOI: 10.1038/mi.2016.82] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 08/15/2016] [Indexed: 02/06/2023]
Abstract
High-mobility group box 1 (HMGB1) mediates various functions according to the location. We tried to investigate the role of HMGB1 in upper airway under hypoxic conditions. We cultured primary normal human nasal epithelium (NHNE) cells under hypoxic conditions and evaluated the movement of HMGB1 by western blotting, immunofluorescence, and enzyme-linked immunosorbent assay (ELISA). Reactive oxygen species (ROS) level was evaluated to estimate the translocation mechanism of HMGB1. The role of secreted HMGB1 was evaluated by ELISA assay. Furthermore, we collected human nasal mucosa samples and nasal lavage fluids from patients conditioned under hypoxic and non-hypoxic environment, and compared the expression of HMGB1 in human nasal mucosa samples by immunohistochemistry and the levels of HMGB1 in lavage fluids using ELISA assay. Hypoxia induced translocation of HMGB1 into the extracellular area and it was dependent on ROS produced by dual oxidase 2. Secreted HMGB1 was involved in the upregulation of interleukin (IL)-8. In human samples, HMGB1 was translocated from nucleus to the cytoplasm in hypoxic-conditioned nasal mucosa. HMGB1 was increased in nasal lavage samples of chronic rhinosinusitis patients, whose sinus mucosa was supposed to be hypoxic as compared with controls. We suggest that HMGB1 is secreted in hypoxic condition via ROS-dependent mechanism and secreted HMGB1 participates in IL-8 upregulation mediating inflammatory response.
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Affiliation(s)
- H J Min
- Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University College of Medicine, Seoul, Republic of Korea
| | - J-H Kim
- The Research Center for Human Natural Defense System, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - J E Yoo
- The Research Center for Human Natural Defense System, Yonsei University College of Medicine, Seoul, Republic of Korea.,The Airway Mucus Institute, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - J-H Oh
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - K S Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University College of Medicine, Seoul, Republic of Korea
| | - J-H Yoon
- The Research Center for Human Natural Defense System, Yonsei University College of Medicine, Seoul, Republic of Korea.,The Airway Mucus Institute, Yonsei University College of Medicine, Seoul, Republic of Korea.,Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - C-H Kim
- The Airway Mucus Institute, Yonsei University College of Medicine, Seoul, Republic of Korea.,Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Republic of Korea
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28
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Chen TX, Xu XY, Zhao Z, Zhao FY, Gao YM, Yan XH, Wan Y. Hydrogen peroxide is a critical regulator of the hypoxia-induced alterations of store-operated Ca2+ entry into rat pulmonary arterial smooth muscle cells. Am J Physiol Lung Cell Mol Physiol 2017; 312:L477-L487. [DOI: 10.1152/ajplung.00138.2016] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 01/23/2017] [Accepted: 01/23/2017] [Indexed: 12/28/2022] Open
Abstract
To investigate the association between store-operated Ca2+ entry (SOCE) and reactive oxygen species (ROS) during hypoxia, this study determined the changes of transient receptor potential canonical 1 (TRPC1) and Orai1, two candidate proteins for store-operated Ca2+ (SOC) channels and their gate regulator, stromal interaction molecule 1 (STIM1), in a hypoxic environment and their relationship with ROS in pulmonary arterial smooth muscle cells (PASMCs). Exposure to hypoxia caused a transient Ca2+ spike and subsequent Ca2+ plateau of SOCE to be intensified in PASMCs when TRPC1, STIM1, and Orai1 were upregulated. SOCE in cells transfected with specific short hairpin RNA (shRNA) constructs was almost completely eliminated by the knockdown of TRPC1, STIM1, or Orai1 alone and was no longer affected by hypoxia exposure. Hypoxia-induced SOCE enhancement was further strengthened by PEG-SOD but was attenuated by PEG-catalase, with correlated changes to intracellular hydrogen peroxide (H2O2) levels and protein levels of TRPC1, STIM1, and Orai1. Exogenous H2O2 could mimic alterations of the interactions of STIM1 with TRPC1 and Orai1 in hypoxic cells. These findings suggest that TRPC1, STIM1, and Orai1 are essential for the initiation of SOCE in PASMCs. Hypoxia-induced ROS promoted the expression and interaction of the SOC channel molecules and their gate regulator via their converted product, H2O2.
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Affiliation(s)
- Tao-Xiang Chen
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Xiao-Ya Xu
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Zhao Zhao
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Fang-Yu Zhao
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Yi-Mei Gao
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Xiao-Hong Yan
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Yu Wan
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
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29
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Schwarzländer M, Dick TP, Meyer AJ, Morgan B. Dissecting Redox Biology Using Fluorescent Protein Sensors. Antioxid Redox Signal 2016; 24:680-712. [PMID: 25867539 DOI: 10.1089/ars.2015.6266] [Citation(s) in RCA: 191] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
SIGNIFICANCE Fluorescent protein sensors have revitalized the field of redox biology by revolutionizing the study of redox processes in living cells and organisms. RECENT ADVANCES Within one decade, a set of fundamental new insights has been gained, driven by the rapid technical development of in vivo redox sensing. Redox-sensitive yellow and green fluorescent protein variants (rxYFP and roGFPs) have been the central players. CRITICAL ISSUES Although widely used as an established standard tool, important questions remain surrounding their meaningful use in vivo. We review the growing range of thiol redox sensor variants and their application in different cells, tissues, and organisms. We highlight five key findings where in vivo sensing has been instrumental in changing our understanding of redox biology, critically assess the interpretation of in vivo redox data, and discuss technical and biological limitations of current redox sensors and sensing approaches. FUTURE DIRECTIONS We explore how novel sensor variants may further add to the current momentum toward a novel mechanistic and integrated understanding of redox biology in vivo. Antioxid. Redox Signal. 24, 680-712.
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Affiliation(s)
- Markus Schwarzländer
- 1 Plant Energy Biology Lab, Department Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn , Bonn, Germany
| | - Tobias P Dick
- 2 Division of Redox Regulation, German Cancer Research Center (DKFZ) , DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Andreas J Meyer
- 3 Department Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn , Bonn, Germany
| | - Bruce Morgan
- 2 Division of Redox Regulation, German Cancer Research Center (DKFZ) , DKFZ-ZMBH Alliance, Heidelberg, Germany .,4 Cellular Biochemistry, Department of Biology, University of Kaiserslautern , Kaiserslautern, Germany
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30
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Goldenberg NM, Kuebler WM. Endothelial cell regulation of pulmonary vascular tone, inflammation, and coagulation. Compr Physiol 2016; 5:531-59. [PMID: 25880504 DOI: 10.1002/cphy.c140024] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The pulmonary endothelium represents a heterogeneous cell monolayer covering the luminal surface of the entire lung vasculature. As such, this cell layer lies at a critical interface between the blood, airways, and lung parenchyma, and must act as a selective barrier between these diverse compartments. Lung endothelial cells are able to produce and secrete mediators, display surface receptor, and cellular adhesion molecules, and metabolize circulating hormones to influence vasomotor tone, both local and systemic inflammation, and coagulation functions. In this review, we will explore the role of the pulmonary endothelium in each of these systems, highlighting key regulatory functions of the pulmonary endothelial cell, as well as novel aspects of the pulmonary endothelium in contrast to the systemic cell type. The interactions between pulmonary endothelial cells and both leukocytes and platelets will be discussed in detail, and wherever possible, elements of endothelial control over physiological and pathophysiological processes will be examined.
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Affiliation(s)
- Neil M Goldenberg
- The Keenan Research Centre for Biomedical Science of St. Michael's, Toronto, Ontario, Canada; Department of Anesthesia, University of Toronto, Ontario, Canada
| | - Wolfgang M Kuebler
- The Keenan Research Centre for Biomedical Science of St. Michael's, Toronto, Ontario, Canada; German Heart Institute Berlin, Germany; Institute of Physiology, Charité-Universitätsmedizin Berlin, Germany; Department of Surgery, University of Toronto, Ontario, Canada; Department of Physiology, University of Toronto, Ontario,Canada
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31
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Hermes-Lima M, Moreira DC, Rivera-Ingraham GA, Giraud-Billoud M, Genaro-Mattos TC, Campos ÉG. Preparation for oxidative stress under hypoxia and metabolic depression: Revisiting the proposal two decades later. Free Radic Biol Med 2015; 89:1122-43. [PMID: 26408245 DOI: 10.1016/j.freeradbiomed.2015.07.156] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 07/11/2015] [Accepted: 07/25/2015] [Indexed: 12/22/2022]
Abstract
Organisms that tolerate wide variations in oxygen availability, especially to hypoxia, usually face harsh environmental conditions during their lives. Such conditions include, for example, lack of food and/or water, low or high temperatures, and reduced oxygen availability. In contrast to an expected strong suppression of protein synthesis, a great number of these animals present increased levels of antioxidant defenses during oxygen deprivation. These observations have puzzled researchers for more than 20 years. Initially, two predominant ideas seemed to be irreconcilable: on one hand, hypoxia would decrease reactive oxygen species (ROS) production, while on the other the induction of antioxidant enzymes would require the overproduction of ROS. This induction of antioxidant enzymes during hypoxia was viewed as a way to prepare animals for oxidative damage that may happen ultimately during reoxygenation. The term "preparation for oxidative stress" (POS) was coined in 1998 based on such premise. However, there are many cases of increased oxidative damage in several hypoxia-tolerant organisms under hypoxia. In addition, over the years, the idea of an assured decrease in ROS formation under hypoxia was challenged. Instead, several findings indicate that the production of ROS actually increases in response to hypoxia. Recently, it became possible to provide a comprehensive explanation for the induction of antioxidant enzymes under hypoxia. The supporting evidence and the limitations of the POS idea are extensively explored in this review as we discuss results from research on estivation and situations of low oxygen stress, such as hypoxia, freezing exposure, severe dehydration, and air exposure of water-breathing animals. We propose that, under some level of oxygen deprivation, ROS are overproduced and induce changes leading to hypoxic biochemical responses. These responses would occur mainly through the activation of specific transcription factors (FoxO, Nrf2, HIF-1, NF-κB, and p53) and post translational mechanisms, both mechanisms leading to enhanced antioxidant defenses. Moreover, reactive nitrogen species are candidate modulators of ROS generation in this scenario. We conclude by drawing out the future perspectives in this field of research, and how advances in the knowledge of the mechanisms involved in the POS strategy will offer new and innovative study scenarios of biological and physiological cellular responses to environmental stress.
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Affiliation(s)
- Marcelo Hermes-Lima
- Laboratório de Radicais Livres, Departamento de Biologia Celular, Universidade de Brasília, Brasí;lia, DF, 70910-900, Brazil.
| | - Daniel C Moreira
- Laboratório de Radicais Livres, Departamento de Biologia Celular, Universidade de Brasília, Brasí;lia, DF, 70910-900, Brazil
| | - Georgina A Rivera-Ingraham
- Groupe Fonctionnel AEO (Adaptation Ecophysiologique et Ontogenèse), UMR 9190 MARBEC, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France
| | - Maximiliano Giraud-Billoud
- Laboratorio de Fisiología (IHEM-CONICET), and Instituto de Fisiología (Facultad de Ciencias Médicas, Universidad Nacional de Cuyo), Casilla de Correo 33, 5500 Mendoza, Argentina
| | - Thiago C Genaro-Mattos
- Laboratório de Radicais Livres, Departamento de Biologia Celular, Universidade de Brasília, Brasí;lia, DF, 70910-900, Brazil; Laboratório de Espectrometria de Massa, Embrapa Recursos Genéticos e Biotecnologia, Brasí;lia, DF, Brazil
| | - Élida G Campos
- Laboratório de Radicais Livres, Departamento de Biologia Celular, Universidade de Brasília, Brasí;lia, DF, 70910-900, Brazil
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Kumarasamy C, Singh G, Raman P, Mala K. Effect of protein arginine methyltransferase-1 inhibition on hypoxia-induced vasoconstriction. Med Hypotheses 2015; 85:740-3. [PMID: 26527496 DOI: 10.1016/j.mehy.2015.10.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 10/18/2015] [Indexed: 12/11/2022]
Abstract
Hypoxia is defined as a decrease in the oxygen supply to a level below physiological levels which is insufficient to maintain cellular function, in the presence of unrestricted coronary inflow. It is one of the leading causes of global mortality and morbidity, due to its association with the pathology of cancer, cardiovascular disease and stroke. The common feature in these pathologies is the limitation of oxygen availability that participates in the development of these conditions. The pulmonary response to hypoxia, when hypoxia is localized, is hypoxic pulmonary vasoconstriction (HPV). HPV is a physiological and self-regulatory mechanism by which pulmonary capillary blood flow is automatically adjusted to alveolar ventilation for maintaining the optimal balance of ventilation and perfusion. In pathological conditions, HPV occurs as an acute episode during progressive critical illness or as a sustained response with vascular remodeling and pulmonary hypertension. Inspite of the hypoxia-induced shift in the redox status to a more oxidized state, the endothelium-dependent mediators of HPV that cause vasoconstrictor response to hypoxia include nitric oxide (NO), endothelin-1 and angiotensin-II. Indeed, in chronic hypoxia, due to the enhanced reactive oxygen species (ROS) generation, inhibition of endothelial nitric oxide synthase (eNOS) activity and reduced nitric oxide (NO) production there is an imbalance in the vasoconstriction-vasodilation status toward constriction. It is our hypothesis that, in hypoxic stress, a key player in initiating this imbalance is the enzyme, protein arginine methyltransferase-1 (PRMT1) which indirectly affects eNOS activity by increased production of asymmetric dimethylarginine (ADMA), a NOS-inhibitor. Thus, pharmacological inhibition of PRMT1 should restore the cellular and vascular homeostasis in hypoxic conditions.
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Affiliation(s)
- Chellan Kumarasamy
- Department of Biotechnology, School of Bioengineering, SRM University, Potheri 603202, India
| | - Gurpreet Singh
- Department of Biotechnology, School of Bioengineering, SRM University, Potheri 603202, India
| | - Pachaiappan Raman
- Department of Biotechnology, School of Bioengineering, SRM University, Potheri 603202, India
| | - Kanchana Mala
- Medical College Hospital and Research Center, SRM University, Potheri 603202, India.
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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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Yoo HY, Park SJ, Kim HJ, Kim WK, Kim SJ. Integrative understanding of hypoxic pulmonary vasoconstriction using in vitro models: from ventilated/perfused lung to single arterial myocyte. Integr Med Res 2014; 3:180-188. [PMID: 28664095 PMCID: PMC5481745 DOI: 10.1016/j.imr.2014.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 08/27/2014] [Accepted: 08/27/2014] [Indexed: 10/25/2022] Open
Abstract
Contractile response of a pulmonary artery (PA) to hypoxia (hypoxic pulmonary vasoconstriction; HPV) is a unique physiological reaction. HPV is beneficial for the optimal distribution of blood flow to differentially ventilated alveolar regions in the lung, thereby preventing systemic hypoxemia. Numerous in vitro studies have been conducted to elucidate the mechanisms underlying HPV. These studies indicate that PA smooth muscle cells (PASMCs) sense lowers the oxygen partial pressure (PO2) and contract under hypoxia. As for the PO2-sensing molecules, a variety of ion channels in PASMCs had been suggested. Nonetheless, the modulator(s) of the ion channels alone cannot mimic HPV in the experiments using PA segments and/or isolated organs. We compared the hypoxic responses of PASMCs, PAs, lung slices, and total lungs using a variety of methods (e.g., patch-clamp technique, isometric contraction measurement, video analysis of precision-cut lung slices, and PA pressure measurement in ventilated/perfused lungs). In this review, the relevant results are compared to provide a comprehensive understanding of HPV. Integration of the influences from surrounding tissues including blood cells as well as the hypoxic regulation of ion channels in PASMCs are indispensable for insights into HPV and other related clinical conditions.
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Affiliation(s)
- Hae Young Yoo
- Red Cross College of Nursing, Chung-Ang University, Seoul, Korea
| | - Su Jung Park
- Department of Physiology, College of Medicine, Seoul National University, Seoul, Korea.,Department of Biomedical Sciences, College of Medicine, Seoul National University, Seoul, Korea.,Ischemic/Hypoxic Disease Institute, College of Medicine, Seoul National University, Seoul, Korea
| | - Hae Jin Kim
- Department of Physiology, College of Medicine, Seoul National University, Seoul, Korea.,Department of Biomedical Sciences, College of Medicine, Seoul National University, Seoul, Korea.,Ischemic/Hypoxic Disease Institute, College of Medicine, Seoul National University, Seoul, Korea
| | - Woo Kyung Kim
- Department of Internal Medicine and Channelopathy Research Institute (CRC), College of Medicine, Dongguk University, Goyang, Korea
| | - Sung Joon Kim
- Department of Physiology, College of Medicine, Seoul National University, Seoul, Korea.,Department of Biomedical Sciences, College of Medicine, Seoul National University, Seoul, Korea.,Ischemic/Hypoxic Disease Institute, College of Medicine, Seoul National University, Seoul, Korea
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Awad H, Nolette N, Hinton M, Dakshinamurti S. AMPK and FoxO1 regulate catalase expression in hypoxic pulmonary arterial smooth muscle. Pediatr Pulmonol 2014; 49:885-97. [PMID: 24167160 DOI: 10.1002/ppul.22919] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Accepted: 08/13/2013] [Indexed: 11/10/2022]
Abstract
BACKGROUND Hypoxia and reactive oxygen species (ROS) including H(2)O(2) play major roles in triggering and progression of pulmonary vascular remodeling in persistent pulmonary hypertension. Catalase (CAT), the major endogenous enzyme scavenging H(2)O(2), is regulated in a tissue- and context-specific manner. OBJECTIVE To investigate mechanisms by which hypoxia and H(2)O(2) regulate catalase expression, and the role of AMPK-FoxO pathway, in neonatal porcine pulmonary artery smooth muscle (PASMC). DESIGN/METHODS PASMC were grown in hypoxia (10% O(2)) or normoxia (21% O(2)) for 72 hr. We measured catalase activity and lipid peroxidation; CAT, FoxO1, and FoxO3a expression by qPCR; protein contents of CAT, FoxOs, p-AMPK, p-AKT, p-JNK, p-ERK1/2 in whole lysates, and FoxOs in nuclear extracts, by immunoblot; and FoxO-1 nuclear localization by immunocytochemistry, quantified by laser scanning cytometry. RESULTS Hypoxia upregulated CAT transcription, content and activity, by increasing CAT transcription factors FoxO1 and FoxO3a mRNA, and promoting nuclear translocation of FoxO1. However, lipid peroxidation increased in hypoxic PASMC. Among candidate FoxO regulatory kinases, hypoxia activated AMPK, and decreased p-Akt and ERK1/2. AMPK activation increased FoxO1 (total and nuclear) and CAT, while AMPK inhibition inhibited FoxO1 and CAT, but not FoxO3a. Exogenous H(2)O(2) decreased p-AMPK and increased p-AKT in hypoxic PASMC. This decreased active FoxO1, and reduced mRNA and protein content of CAT. Hypoxic induction of CAT, AKT inhibition (LY294002), or addition of PEG-catalase partly ameliorated the H(2)O(2) -mediated loss of nuclear FoxO1. CONCLUSIONS Hypoxia induces catalase expression, though this adaptation is insufficient to protect PASMC from hypoxia-induced lipid peroxidation. This occurs via hypoxic activation of AMPK, which promotes nuclear FoxO1 and thus catalase expression. Exogenous ROS may downregulate cellular antioxidant defenses; H(2)O(2) activates survival factor Akt, decreasing nuclear FoxO1 and thus catalase.
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Affiliation(s)
- Hanan Awad
- Biology of Breathing Group, Manitoba Institute of Child Health, Winnipeg, Canada
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Kaludercic N, Deshwal S, Di Lisa F. Reactive oxygen species and redox compartmentalization. Front Physiol 2014; 5:285. [PMID: 25161621 PMCID: PMC4130307 DOI: 10.3389/fphys.2014.00285] [Citation(s) in RCA: 120] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 07/11/2014] [Indexed: 01/01/2023] Open
Abstract
Reactive oxygen species (ROS) formation and signaling are of major importance and regulate a number of processes in physiological conditions. A disruption in redox status regulation, however, has been associated with numerous pathological conditions. In recent years it has become increasingly clear that oxidative and reductive modifications are confined in a spatio-temporal manner. This makes ROS signaling similar to that of Ca(2+) or other second messengers. Some subcellular compartments are more oxidizing (such as lysosomes or peroxisomes) whereas others are more reducing (mitochondria, nuclei). Moreover, although more reducing, mitochondria are especially susceptible to oxidation, most likely due to the high number of exposed thiols present in that compartment. Recent advances in the development of redox probes allow specific measurement of defined ROS in different cellular compartments in intact living cells or organisms. The availability of these tools now allows simultaneous spatio-temporal measurements and correlation between ROS generation and organelle and/or cellular function. The study of ROS compartmentalization and microdomains will help elucidate their role in physiology and disease. Here we will examine redox probes currently available and how ROS generation may vary between subcellular compartments. Furthermore, we will discuss ROS compartmentalization in physiological and pathological conditions focusing our attention on mitochondria, since their vulnerability to oxidative stress is likely at the basis of several diseases.
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Affiliation(s)
- Nina Kaludercic
- Neuroscience Institute, National Research Council of Italy (CNR) Padova, Italy
| | - Soni Deshwal
- Department of Biomedical Sciences, University of Padova Padova, Italy
| | - Fabio Di Lisa
- Neuroscience Institute, National Research Council of Italy (CNR) Padova, Italy ; Department of Biomedical Sciences, University of Padova Padova, Italy
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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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Berkelhamer SK, Kim GA, Radder JE, Wedgwood S, Czech L, Steinhorn RH, Schumacker PT. Developmental differences in hyperoxia-induced oxidative stress and cellular responses in the murine lung. Free Radic Biol Med 2013; 61:51-60. [PMID: 23499839 PMCID: PMC3723750 DOI: 10.1016/j.freeradbiomed.2013.03.003] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Revised: 02/24/2013] [Accepted: 03/04/2013] [Indexed: 01/11/2023]
Abstract
Exposure of newborn mice to high inspired oxygen elicits a distinct phenotype of compromised alveolar and vascular development, although lethality during long-term exposure is lower in newborns compared to adults. As the effects of hyperoxia are mediated by excessive reactive oxygen species (ROS) generation, we hypothesized that newborn mice may exhibit enhanced expression of antioxidant defenses or attenuated ROS generation compared with adults. We measured subcellular oxidant responses to acute hyperoxia in lung slices and alveolar epithelial cells at varying time points during postnatal murine lung development. Oxidant stress was assessed using RoGFP, a ratiometric protein thiol redox sensor, targeted to the cytosol or the mitochondrial matrix. In contrast to newborn resistance to oxygen-induced mortality, cells of lung slices from younger mice demonstrated exaggerated mitochondrial matrix oxidant stress compared to adults, whereas oxidant stress responses in the cytosol were absent. Cell death in lung slices from newborn mice exposed to 48h of hyperoxia was also greater than for adults. Consistent with these findings, expression of antioxidant enzymes in newborn lungs was lower than in adults, and induction of antioxidant levels and activity during 24h of in vivo exposure was absent. However, expression of the reactive oxygen species-generating enzyme NADPH oxidase 1 was increased with hyperoxic exposure in the young but not the adult lung. Collectively, these results suggest that the greater lethality in adult animals may be more likely attributed to processes such as inflammation than to differences in antioxidant defenses. Therapies for neonatal and adult oxidative lung injury should therefore consider and address developmental differences in oxidative stress responses.
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Affiliation(s)
- Sara K. Berkelhamer
- Department of Pediatrics, 310 E. Superior St, Morton Building, Northwestern University, Chicago IL. 60611 USA
| | - Gina A. Kim
- Department of Pediatrics, 310 E. Superior St, Morton Building, Northwestern University, Chicago IL. 60611 USA
| | - Josiah E. Radder
- Department of Pulmonary and Critical Care Medicine, 240 E. Huron Ave, McGaw Mezzanine, Northwestern University, Chicago, IL. 60611 USA
| | - Stephen Wedgwood
- Department of Pediatrics, 310 E. Superior St, Morton Building, Northwestern University, Chicago IL. 60611 USA
| | - Lyubov Czech
- Department of Pediatrics, 310 E. Superior St, Morton Building, Northwestern University, Chicago IL. 60611 USA
| | - Robin H. Steinhorn
- Department of Pediatrics, 310 E. Superior St, Morton Building, Northwestern University, Chicago IL. 60611 USA
| | - Paul T. Schumacker
- Department of Pediatrics, 310 E. Superior St, Morton Building, Northwestern University, Chicago IL. 60611 USA
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Connolly MJ, Prieto-Lloret J, Becker S, Ward JPT, Aaronson PI. Hypoxic pulmonary vasoconstriction in the absence of pretone: essential role for intracellular Ca2+ release. J Physiol 2013; 591:4473-98. [PMID: 23774281 DOI: 10.1113/jphysiol.2013.253682] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Hypoxic pulmonary vasoconstriction (HPV) maintains blood oxygenation during acute hypoxia but contributes to pulmonary hypertension during chronic hypoxia. The mechanisms of HPV remain controversial, in part because HPV is usually studied in the presence of agonist-induced preconstriction ('pretone'). This potentiates HPV but may obscure and distort its underlying mechanisms. We therefore carried out an extensive assessment of proposed mechanisms contributing to HPV in isolated intrapulmonary arteries (IPAs) in the absence of pretone by using a conventional small vessel myograph. Hypoxia elicited a biphasic constriction consisting of a small transient (phase 1) superimposed upon a sustained (phase 2) component. Neither phase was affected by the L-type Ca2+ channel antagonists diltiazem (10 and 30 μm) or nifedipine (3 μm). Application of the store-operated Ca2+ entry (SOCE) blockers BTP2 (10 μm) or SKF96365 (50 μm) attenuated phase 2 but not phase 1, whereas a lengthy (30 min) incubation in Ca2+-free physiological saline solution similarly reduced phase 2 but abolished phase 1. No further effect of inhibition of HPV was observed if the sarco/endoplasmic reticulum Ca2+-ATPase inhibitor cyclopiazonic acid (30 μm) was also applied during the 30 min incubation in Ca2+-free physiological saline solution. Pretreatment with 10 μm ryanodine and 15 mm caffeine abolished both phases, whereas treatment with 100 μm ryanodine attenuated both phases. The two-pore channel blocker NED-19 (1 μm) and the nicotinic acid adenine dinucleotide phosphate (NAADP) antagonist BZ194 (200 μm) had no effect on either phase of HPV. The lysosomal Ca2+-depleting agent concanamycin (1 μm) enhanced HPV if applied during hypoxia, but had no effect on HPV during a subsequent hypoxic challenge. The cyclic ADP ribose antagonist 8-bromo-cyclic ADP ribose (30 μm) had no effect on either phase of HPV. Neither the Ca2+-sensing receptor (CaSR) blocker NPS2390 (0.1 and 10 μm) nor FK506 (10 μm), a drug which displaces FKBP12.6 from ryanodine receptor 2 (RyR2), had any effect on HPV. HPV was virtually abolished by the rho kinase blocker Y-27632 (1 μm) and attenuated by the protein kinase C inhibitor Gö6983 (3 μm). Hypoxia for 45 min caused a significant increase in the ratio of oxidised to reduced glutathione (GSSG/GSH). HPV was unaffected by the NADPH oxidase inhibitor VAS2870 (10 μm), whereas phase 2 was inhibited but phase 1 was unaffected by the antioxidants ebselen (100 μm) and TEMPOL (3 mm). We conclude that both phases of HPV in this model are mainly dependent on [Ca2+]i release from the sarcoplasmic reticulum. Neither phase of HPV requires voltage-gated Ca2+ entry, but SOCE contributes to phase 2. We can detect no requirement for cyclic ADP ribose, NAADP-dependent lysosomal Ca2+ release, activation of the CaSR, or displacement of FKBP12.6 from RyR2 for either phase of HPV. Sustained HPV is associated with an oxidising shift in the GSSG/GSH redox potential and is inhibited by the antioxidants ebselen and TEMPOL, consistent with the concept that it requires an oxidising shift in the cell redox state or the generation of reactive oxygen species.
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Affiliation(s)
- Michelle J Connolly
- P. I. Aaronson: Room 1.19, Henriette Raphael House, Guy's Campus, King's College London, London SE1 9HN, UK.
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Waypa GB, Marks JD, Guzy RD, Mungai PT, Schriewer JM, Dokic D, Ball MK, Schumacker PT. Superoxide generated at mitochondrial complex III triggers acute responses to hypoxia in the pulmonary circulation. Am J Respir Crit Care Med 2013; 187:424-32. [PMID: 23328522 DOI: 10.1164/rccm.201207-1294oc] [Citation(s) in RCA: 118] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
RATIONALE The role of reactive oxygen species (ROS) signaling in the O(2) sensing mechanism underlying acute hypoxic pulmonary vasoconstriction (HPV) has been controversial. Although mitochondria are important sources of ROS, studies using chemical inhibitors have yielded conflicting results, whereas cellular models using genetic suppression have precluded in vivo confirmation. Hence, genetic animal models are required to test mechanistic hypotheses. OBJECTIVES We tested whether mitochondrial Complex III is required for the ROS signaling and vasoconstriction responses to acute hypoxia in pulmonary arteries (PA). METHODS A mouse permitting Cre-mediated conditional deletion of the Rieske iron-sulfur protein (RISP) of Complex III was generated. Adenoviral Cre recombinase was used to delete RISP from isolated PA vessels or smooth muscle cells (PASMC). MEASUREMENTS AND MAIN RESULTS In PASMC, RISP depletion abolished hypoxia-induced increases in ROS signaling in the mitochondrial intermembrane space and cytosol, and it abrogated hypoxia-induced increases in [Ca(2+)](i). In isolated PA vessels, RISP depletion abolished hypoxia-induced ROS signaling in the cytosol. Breeding the RISP mice with transgenic mice expressing tamoxifen-activated Cre in smooth muscle permitted the depletion of RISP in PASMC in vivo. Precision-cut lung slices from those mice revealed that RISP depletion abolished hypoxia-induced increases in [Ca(2+)](i) of the PA. In vivo RISP depletion in smooth muscle attenuated the acute hypoxia-induced increase in right ventricular systolic pressure in anesthetized mice. CONCLUSIONS Acute hypoxia induces superoxide release from Complex III of smooth muscle cells. These oxidant signals diffuse into the cytosol and trigger increases in [Ca(2+)](i) that cause acute hypoxic pulmonary vasoconstriction.
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Affiliation(s)
- Gregory B Waypa
- Department of Pediatrics, Division of Neonatology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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Lung oxidative damage by hypoxia. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2012; 2012:856918. [PMID: 22966417 PMCID: PMC3433143 DOI: 10.1155/2012/856918] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 07/11/2012] [Indexed: 12/12/2022]
Abstract
One of the most important functions of lungs is to maintain an adequate oxygenation in the organism. This organ can be affected by hypoxia facing both physiological and pathological situations. Exposure to this condition favors the increase of reactive oxygen species from mitochondria, as from NADPH oxidase, xanthine oxidase/reductase, and nitric oxide synthase enzymes, as well as establishing an inflammatory process. In lungs, hypoxia also modifies the levels of antioxidant substances causing pulmonary oxidative damage. Imbalance of redox state in lungs induced by hypoxia has been suggested as a participant in the changes observed in lung function in the hypoxic context, such as hypoxic vasoconstriction and pulmonary edema, in addition to vascular remodeling and chronic pulmonary hypertension. In this work, experimental evidence that shows the implied mechanisms in pulmonary redox state by hypoxia is reviewed. Herein, studies of cultures of different lung cells and complete isolated lung and tests conducted in vivo in the different forms of hypoxia, conducted in both animal models and humans, are described.
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Liu Y, Wang C, Wang Y, Ma Z, Xiao J, McClain C, Li X, Feng W. Cobalt chloride decreases fibroblast growth factor-21 expression dependent on oxidative stress but not hypoxia-inducible factor in Caco-2 cells. Toxicol Appl Pharmacol 2012; 264:212-21. [PMID: 22917661 DOI: 10.1016/j.taap.2012.08.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Revised: 08/02/2012] [Accepted: 08/03/2012] [Indexed: 01/29/2023]
Abstract
Fibroblast growth factor-21 (FGF21) is a potential metabolic regulator with multiple beneficial effects on metabolic diseases. FGF21 is mainly expressed in the liver, but is also found in other tissues including the intestine, which expresses β-klotho abundantly. The intestine is a unique organ that operates in a physiologically hypoxic environment, and is responsible for the fat absorption processes including triglyceride breakdown, re-synthesis and absorption into the portal circulation. In the present study, we investigated the effects of hypoxia and the chemical hypoxia inducer, cobalt chloride (CoCl(2)), on FGF21 expression in Caco-2 cells and the consequence of fat accumulation. Physical hypoxia (1% oxygen) and CoCl(2) treatment decreased both FGF21 mRNA and secreted protein levels. Gene silence and inhibition of hypoxia-inducible factor-α (HIFα) did not affect the reduction of FGF21 mRNA and protein levels by hypoxia. However, CoCl(2) administration caused a significant increase in oxidative stress. The addition of n-acetylcysteine (NAC) suppressed CoCl(2)-induced reactive oxygen species (ROS) formation and completely negated CoCl(2)-induced FGF21 loss. mRNA stability analysis demonstrated that the CoCl(2) administration caused a remarkable reduction in FGF21 mRNA stability. Furthermore, CoCl(2) increased intracellular triglyceride (TG) accumulation, along with a reduction in mRNA levels of lipid lipase, hormone sensitive lipase (HSL) and adipose triglyceride lipase (ATGL), and an increase of sterol regulatory element-binding protein-1c (SREBP1c) and stearoyl-coenzyme A (SCD1). Addition of both NAC and recombinant FGF21 significantly attenuated the CoCl(2)-induced TG accumulation. In conclusion, the decrease of FGF21 in Caco-2 cells by chemical hypoxia is independent of HIFα, but dependent on an oxidative stress-mediated mechanism. The regulation of FGF21 by hypoxia may contribute to intestinal lipid metabolism and absorption.
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Affiliation(s)
- Yanlong Liu
- School of Pharmacy, Wenzhou Medical College, Wenzhou, China
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Zhang J, Zhou J, Cai L, Lu Y, Wang T, Zhu L, Hu Q. Extracellular calcium-sensing receptor is critical in hypoxic pulmonary vasoconstriction. Antioxid Redox Signal 2012; 17:471-84. [PMID: 22098336 DOI: 10.1089/ars.2011.4168] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
AIMS The initiation of hypoxic pulmonary vasoconstriction (HPV) involves an increase in cytosolic calcium ([Ca(2+)](i)) in pulmonary artery (PA) smooth muscle cells (PASMCs). Both the processes depend on extracellular Ca(2+). Extracellular Ca(2+) can be sensed by extracellular calcium-sensing receptor (CaSR). This study aims at determining whether CaSR is pivotal in the initiation of HPV. RESULTS Experiments were performed in cultured PASMCs, isolated PAs, and rats including CaSR knockdown preparations. Both hypoxia and H(2)O(2) equivalent to the level achieved by hypoxia increased [Ca(2+)](i) in an extracellular Ca(2+)-dependent manner in PASMCs, and this was inhibited by CaSR knockdown or its negative allosteric modulator, Calhex231. Hypoxia-increased H(2)O(2) generation was diminished by mitochondria depletion. Mitochondria depletion abolished hypoxia-induced [Ca(2+)](i) increase (HICI), which was reversed by H(2)O(2) repletion. CaSR knockdown or Calhex231, however, prevented the reversible effect of H(2)O(2). HICI was abolished by catalase-polyethylene glycol (PEG-Catalase), not superoxide dismutase-polyethylene glycol (PEG-SOD) pretreatment, attenuated by ryanodine receptor3-knockdown or inhibition of store-operated Ca(2+) entry. HPV in vitro and in vivo was inhibited by Calhex231 and by CaSR knockdown. INNOVATION A novel mechanism underlying HPV is revealed by the role of CaSR in orchestrating reactive oxygen species and [Ca(2+)](i) signaling. CONCLUSIONS The activation of mitochondrial H(2)O(2)-sensitized CaSR by extracellular Ca(2+) mediates HICI in PASMCs and, thus, initiates HPV.
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Affiliation(s)
- Jiwei Zhang
- Department of Pathophysiology, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan, People's Republic of China
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Differential redox proteomics allows identification of proteins reversibly oxidized at cysteine residues in endothelial cells in response to acute hypoxia. J Proteomics 2012; 75:5449-62. [PMID: 22800641 DOI: 10.1016/j.jprot.2012.06.035] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 06/13/2012] [Accepted: 06/26/2012] [Indexed: 11/21/2022]
Abstract
Adaptation to decreased oxygen availability (hypoxia) is crucial for proper cell function and survival. In metazoans, this is partly achieved through gene transcriptional responses mediated by hypoxia-inducible factors (HIFs). There is abundant evidence that production of reactive oxygen species (ROS) increases during hypoxia, which contributes to the activation of the HIF pathway. In addition to altering the cellular redox balance, leading to oxidative stress, ROS can transduce signals by reversibly modifying the redox state of cysteine residues in certain proteins. Using the "redox fluorescence switch" (RFS), a thiol redox proteomic technique that fluorescently labels reversibly oxidized cysteines, we analyzed endothelial cells subjected to acute hypoxia and subsequent reoxygenation. We observed a general increase in cysteine oxidation during hypoxia, which was reversed by reoxygenation, and two-dimensional electrophoresis revealed the differential oxidation of specific proteins. Using complementary derivatization techniques, we confirmed the modification of individual target proteins and identified specific cysteine residues that were oxidized in hypoxic conditions, thereby overcoming several limitations associated with fluorescence derivatization. These findings provide an important basis for future studies of the role of these modifications in HIF activation and in other acute adaptive responses to hypoxia.
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Al-Mehdi AB, Pastukh VM, Swiger BM, Reed DJ, Patel MR, Bardwell GC, Pastukh VV, Alexeyev MF, Gillespie MN. Perinuclear mitochondrial clustering creates an oxidant-rich nuclear domain required for hypoxia-induced transcription. Sci Signal 2012; 5:ra47. [PMID: 22763339 DOI: 10.1126/scisignal.2002712] [Citation(s) in RCA: 257] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mitochondria can govern local concentrations of second messengers, such as reactive oxygen species (ROS), and mitochondrial translocation to discrete subcellular regions may contribute to this signaling function. Here, we report that exposure of pulmonary artery endothelial cells to hypoxia triggered a retrograde mitochondrial movement that required microtubules and the microtubule motor protein dynein and resulted in the perinuclear clustering of mitochondria. This subcellular redistribution of mitochondria was accompanied by the accumulation of ROS in the nucleus, which was attenuated by suppressing perinuclear clustering of mitochondria with nocodazole to destabilize microtubules or with small interfering RNA-mediated knockdown of dynein. Although suppression of perinuclear mitochondrial clustering did not affect the hypoxia-induced increase in the nuclear abundance of hypoxia-inducible factor 1α (HIF-1α) or the binding of HIF-1α to an oligonucleotide corresponding to a hypoxia response element (HRE), it eliminated oxidative modifications of the VEGF (vascular endothelial growth factor) promoter. Furthermore, suppression of perinuclear mitochondrial clustering reduced HIF-1α binding to the VEGF promoter and decreased VEGF mRNA accumulation. These findings support a model for hypoxia-induced transcriptional regulation in which perinuclear mitochondrial clustering results in ROS accumulation in the nucleus and causes oxidative base modifications in the VEGF HRE that are important for transcriptional complex assembly and VEGF mRNA expression.
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Affiliation(s)
- Abu-Bakr Al-Mehdi
- Department of Pharmacology, College of Medicine, University of South Alabama, Mobile, AL 36688, USA
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Mittal M, Gu XQ, Pak O, Pamenter ME, Haag D, Fuchs DB, Schermuly RT, Ghofrani HA, Brandes RP, Seeger W, Grimminger F, Haddad GG, Weissmann N. Hypoxia induces Kv channel current inhibition by increased NADPH oxidase-derived reactive oxygen species. Free Radic Biol Med 2012; 52:1033-42. [PMID: 22222468 DOI: 10.1016/j.freeradbiomed.2011.12.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Revised: 11/23/2011] [Accepted: 12/03/2011] [Indexed: 10/24/2022]
Abstract
There is current discussion whether reactive oxygen species are up- or downregulated in the pulmonary circulation during hypoxia, from which sources (i.e., mitochondria or NADPH oxidases) they are derived, and what the downstream targets of ROS are. We recently showed that the NADPH oxidase homolog NOX4 is upregulated in hypoxia-induced pulmonary hypertension in mice and contributes to the vascular remodeling in pulmonary hypertension. We here tested the hypothesis that NOX4 regulates K(v) channels via an increased ROS formation after prolonged hypoxia. We showed that (1) NOX4 is upregulated in hypoxia-induced pulmonary hypertension in rats and isolated rat pulmonary arterial smooth muscle cells (PASMC) after 3days of hypoxia, and (2) that NOX4 is a major contributor to increased reactive oxygen species (ROS) after hypoxia. Our data indicate colocalization of K(v)1.5 and NOX4 in isolated PASMC. The NADPH oxidase inhibitor and ROS scavenger apocynin as well as NOX4 siRNA reversed the hypoxia-induced decrease in K(v) current density whereas the protein levels of the channels remain unaffected by siNOX4 treatment. Determination of cysteine oxidation revealed increased NOX4-mediated K(v)1.5 channel oxidation. We conclude that sustained hypoxia decreases K(v) channel currents by a direct effect of a NOX4-derived increase in ROS.
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Affiliation(s)
- Manish Mittal
- Excellence Cluster Cardio-Pulmonary System, University of Giessen Lung Center, Justus-Liebig-University, Medical Clinic II/V, Aulweg 130, Giessen 35392, Germany
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Park SJ, Yoo HY, Kim HJ, Kim JK, Zhang YH, Kim SJ. Requirement of Pretone by Thromboxane A(2) for Hypoxic Pulmonary Vasoconstriction in Precision-cut Lung Slices of Rat. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2012; 16:59-64. [PMID: 22416221 PMCID: PMC3298827 DOI: 10.4196/kjpp.2012.16.1.59] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 01/22/2012] [Accepted: 01/25/2012] [Indexed: 01/28/2023]
Abstract
Hypoxic pulmonary vasoconstriction (HPV) is physiologically important response for preventing mismatching between ventilation and perfusion in lungs. The HPV of isolated pulmonary arteries (HPV-PA) usually require a partial pretone by thromboxane agonist (U46619). Because the HPV of ventilated/perfused lungs (HPV-lung) can be triggered without pretone conditioning, we suspected that a putative tissue factor might be responsible for the pretone of HPV. Here we investigated whether HPV can be also observed in precision-cut lung slices (PCLS) from rats. The HPV in PCLS also required partial contraction by U46619. In addition, K+ channel blockers (4AP and TEA) required U46619-pretone to induce significant contraction of PA in PCLS. In contrast, the airways in PCLS showed reversible contraction in response to the K+ channel blockers without pretone conditioning. Also, the airways showed no hypoxic constriction but a relaxation under the partial pretone by U46619. The airways in PCLS showed reliable, concentration-dependent contraction by metacholine (EC50, ~210 nM). In summary, the HPV in PCLS is more similar to isolated PA than V/P lungs. The metacholine-induced constriction of bronchioles suggested that the PLCS might be also useful for studying airway physiology in situ.
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Affiliation(s)
- Su Jung Park
- Department of Physiology, Seoul National University College of Medicine, Seoul 110-799, Korea
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Du J, Xu R, Hu Z, Tian Y, Zhu Y, Gu L, Zhou L. PI3K and ERK-induced Rac1 activation mediates hypoxia-induced HIF-1α expression in MCF-7 breast cancer cells. PLoS One 2011; 6:e25213. [PMID: 21980400 PMCID: PMC3181265 DOI: 10.1371/journal.pone.0025213] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Accepted: 08/29/2011] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Hypoxia-inducible factor 1 (HIF-1α) expression induced by hypoxia plays a critical role in promoting tumor angiogenesis and metastasis. However, the molecular mechanisms underlying the induction of HIF-1α in tumor cells remain unknown. METHODOLOGY/PRINCIPAL FINDINGS In this study, we reported that hypoxia could induce HIF-1α and VEGF expression accompanied by Rac1 activation in MCF-7 breast cancer cells. Blockade of Rac1 activation with ectopic expression of an inactive mutant form of Rac1 (T17N) or Rac1 siRNA downregulated hypoxia-induced HIF-1α and VEGF expression. Furthermore, Hypoxia increased PI3K and ERK signaling activity. Both PI3K inhibitor LY294002 and ERK inhibitor U0126 suppressed hypoxia-induced Rac1 activation as well as HIF-1α expression. Moreover, hypoxia treatment resulted in a remarkable production of reactive oxygen species (ROS). N-acetyl-L-cysteine, a scavenger of ROS, inhibited hypoxia-induced ROS generation, PI3K, ERK and Rac1 activation as well as HIF-1α expression. CONCLUSIONS/SIGNIFICANCE Taken together, our study demonstrated that hypoxia-induced HIF-1α expression involves a cascade of signaling events including ROS generation, activation of PI3K and ERK signaling, and subsequent activation of Rac1.
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Affiliation(s)
- Jun Du
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Rui Xu
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Zhenzhen Hu
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yinhui Tian
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yichao Zhu
- Cancer Center, Nanjing Medical University, Nanjing, China
| | - Luo Gu
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
- Cancer Center, Nanjing Medical University, Nanjing, China
| | - Lei Zhou
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
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49
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Boardman L, Terblanche JS, Hetz SK, Marais E, Chown SL. Reactive oxygen species production and discontinuous gas exchange in insects. Proc Biol Sci 2011; 279:893-901. [PMID: 21865257 DOI: 10.1098/rspb.2011.1243] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
While biochemical mechanisms are typically used by animals to reduce oxidative damage, insects are suspected to employ a higher organizational level, discontinuous gas exchange mechanism to do so. Using a combination of real-time, flow-through respirometry and live-cell fluorescence microscopy, we show that spiracular control associated with the discontinuous gas exchange cycle (DGC) in Samia cynthia pupae is related to reactive oxygen species (ROS). Hyperoxia fails to increase mean ROS production, although minima are elevated above normoxic levels. Furthermore, a negative relationship between mean and mean ROS production indicates that higher ROS production is generally associated with lower . Our results, therefore, suggest a possible signalling role for ROS in DGC, rather than supporting the idea that DGC acts to reduce oxidative damage by regulating ROS production.
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Affiliation(s)
- Leigh Boardman
- Department of Conservation Ecology and Entomology, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
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50
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Azad P, Ryu J, Haddad GG. Distinct role of Hsp70 in Drosophila hemocytes during severe hypoxia. Free Radic Biol Med 2011; 51:530-8. [PMID: 21616137 PMCID: PMC3138732 DOI: 10.1016/j.freeradbiomed.2011.05.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Revised: 04/29/2011] [Accepted: 05/05/2011] [Indexed: 02/07/2023]
Abstract
Severe hypoxia can lead to injury and mortality in vertebrate or invertebrate organisms. Our research is focused on understanding the molecular mechanisms that lead to injury or adaptation to hypoxic stress using Drosophila as a model system. In this study, we employed the UAS-Gal4 system to dissect the protective role of Hsp70 in specific tissues in vivo under severe hypoxia. In contrast to overexpression in tissues such as muscles, heart, and brain, we found that overexpression of Hsp70 in hemocytes of flies provides a remarkable survival benefit to flies exposed to severe hypoxia for days. Furthermore, these flies were tolerant not only to severe hypoxia but also to other stresses such as oxidant stress (e.g., paraquat feeding or hyperoxia). Interestingly we observed that the better survival with Hsp70 overexpression in hemocytes under hypoxia or oxidant stress is causally linked to reactive oxygen species (ROS) reduction in whole flies. We also show that hemocytes are a major source of ROS generation, leading to injury during hypoxia, and their elimination results in a better survival under hypoxia. Hence, our study identified a protective role for Hsp70 in Drosophila hemocytes, which is linked to ROS reduction in the whole flies and thus helps in their remarkable survival during oxidant or hypoxic stress.
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Affiliation(s)
- Priti Azad
- Department of Pediatrics (Section of Respiratory Medicine), University of California-San Diego, La Jolla, CA 92093, USA
| | - Julie Ryu
- Department of Pediatrics (Section of Respiratory Medicine), University of California-San Diego, La Jolla, CA 92093, USA
- The Rady Children’s Hospital, San Diego, CA 92123, USA
| | - Gabriel G. Haddad
- Department of Pediatrics (Section of Respiratory Medicine), University of California-San Diego, La Jolla, CA 92093, USA
- Department of Neurosciences, University of California-San Diego, La Jolla, CA 92093, USA
- The Rady Children’s Hospital, San Diego, CA 92123, USA
- To whom correspondence should be addressed: Gabriel G. Haddad, MD, Departments of Pediatrics (Section of Respiratory Medicine), 9500 Gilman Dr MC0735, La Jolla, CA 92093, USA, Phone: +1-858-822-4740, Fax- 1- 858-534-6972,
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