Important role of endothelium-dependent hyperpolarization in the pulmonary microcirculation in male mice : implications for hypoxia-induced pulmonary hypertension
Endothelium-dependent hyperpolarization (EDH) plays important roles in the systemic circulation, whereas its role in the pulmonary circulation remains largely unknown. Furthermore, the underlying mechanisms of pulmonary hypertension (PH) also remain to be elucidated. We thus aimed to elucidate the role of EDH in pulmonary circulation in general and in PH in particular. In isolated perfused lung and using male wild-type mice, endothelium-dependent relaxation to bradykinin (BK) was significantly reduced in the presence of Nω-nitro-l-arginine by ~50% compared with those in the presence of indomethacin, and the combination of apamin plus charybdotoxin abolished the residual relaxation, showing the comparable contributions of nitric oxide (NO) and EDH in the pulmonary microcirculation under physiological conditions. Catalase markedly inhibited EDH-mediated relaxation, indicating the predominant contribution of endothelium-derived H2O2. BK-mediated relaxation was significantly reduced at day 1 of hypoxia, whereas it thereafter remained unchanged until day 28. EDH-mediated relaxation was diminished at day 2 of hypoxia, indicating a transition from EDH to NO in BK-mediated relaxation before the development of hypoxia-induced PH. Mechanistically, chronic hypoxia enhanced endothelial NO synthase expression and activity associated with downregulation of caveolin-1. Nitrotyrosine levels were significantly higher in vascular smooth muscle of pulmonary microvessels under chronic hypoxia than under normoxia. A similar transition of the mediators in BK-mediated relaxation was also noted in the Sugen hypoxia mouse model. These results indicate that EDH plays important roles in the pulmonary microcirculation in addition to NO under normoxic conditions and that impaired EDH-mediated relaxation and subsequent nitrosative stress may be potential triggers of the onset of PH. NEW & NOTEWORTHY This study provides novel evidence that both endothelium-dependent hyperpolarization and nitric oxide play important roles in endothelium-dependent relaxation in the pulmonary microcirculation under physiological conditions in mice and that hypoxia first impairs endothelium-dependent hyperpolarization-mediated relaxation, with compensatory upregulation of nitric oxide, before the development of hypoxia-induced pulmonary hypertension.
| Errataetall: |
CommentIn: Am J Physiol Heart Circ Physiol. 2018 May 1;314(5):H892-H894. - PMID 29351003 |
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| Medienart: |
E-Artikel |
| Erscheinungsjahr: |
2018 |
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| Erschienen: |
2018 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:314 |
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| Enthalten in: |
American journal of physiology. Heart and circulatory physiology - 314(2018), 5 vom: 01. Mai, Seite H940-H953 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Tanaka, Shuhei [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 07.01.2019 Date Revised 30.09.2020 published: Print-Electronic CommentIn: Am J Physiol Heart Circ Physiol. 2018 May 1;314(5):H892-H894. - PMID 29351003 Citation Status MEDLINE |
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| doi: |
10.1152/ajpheart.00487.2017 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM280132301 |
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| 245 | 1 | 0 | |a Important role of endothelium-dependent hyperpolarization in the pulmonary microcirculation in male mice |b implications for hypoxia-induced pulmonary hypertension |
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| 500 | |a CommentIn: Am J Physiol Heart Circ Physiol. 2018 May 1;314(5):H892-H894. - PMID 29351003 | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Endothelium-dependent hyperpolarization (EDH) plays important roles in the systemic circulation, whereas its role in the pulmonary circulation remains largely unknown. Furthermore, the underlying mechanisms of pulmonary hypertension (PH) also remain to be elucidated. We thus aimed to elucidate the role of EDH in pulmonary circulation in general and in PH in particular. In isolated perfused lung and using male wild-type mice, endothelium-dependent relaxation to bradykinin (BK) was significantly reduced in the presence of Nω-nitro-l-arginine by ~50% compared with those in the presence of indomethacin, and the combination of apamin plus charybdotoxin abolished the residual relaxation, showing the comparable contributions of nitric oxide (NO) and EDH in the pulmonary microcirculation under physiological conditions. Catalase markedly inhibited EDH-mediated relaxation, indicating the predominant contribution of endothelium-derived H2O2. BK-mediated relaxation was significantly reduced at day 1 of hypoxia, whereas it thereafter remained unchanged until day 28. EDH-mediated relaxation was diminished at day 2 of hypoxia, indicating a transition from EDH to NO in BK-mediated relaxation before the development of hypoxia-induced PH. Mechanistically, chronic hypoxia enhanced endothelial NO synthase expression and activity associated with downregulation of caveolin-1. Nitrotyrosine levels were significantly higher in vascular smooth muscle of pulmonary microvessels under chronic hypoxia than under normoxia. A similar transition of the mediators in BK-mediated relaxation was also noted in the Sugen hypoxia mouse model. These results indicate that EDH plays important roles in the pulmonary microcirculation in addition to NO under normoxic conditions and that impaired EDH-mediated relaxation and subsequent nitrosative stress may be potential triggers of the onset of PH. NEW & NOTEWORTHY This study provides novel evidence that both endothelium-dependent hyperpolarization and nitric oxide play important roles in endothelium-dependent relaxation in the pulmonary microcirculation under physiological conditions in mice and that hypoxia first impairs endothelium-dependent hyperpolarization-mediated relaxation, with compensatory upregulation of nitric oxide, before the development of hypoxia-induced pulmonary hypertension | ||
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| 700 | 1 | |a Shiroto, Takashi |e verfasserin |4 aut | |
| 700 | 1 | |a Godo, Shigeo |e verfasserin |4 aut | |
| 700 | 1 | |a Saito, Hiroki |e verfasserin |4 aut | |
| 700 | 1 | |a Ikumi, Yosuke |e verfasserin |4 aut | |
| 700 | 1 | |a Ito, Akiyo |e verfasserin |4 aut | |
| 700 | 1 | |a Kajitani, Shoko |e verfasserin |4 aut | |
| 700 | 1 | |a Sato, Saori |e verfasserin |4 aut | |
| 700 | 1 | |a Shimokawa, Hiroaki |e verfasserin |4 aut | |
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