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Zhang RG, Liu XJ, Guo YL, Chen CL. SARS-CoV-2 spike protein receptor binding domain promotes IL-6 and IL-8 release via ATP/P2Y 2 and ERK1/2 signaling pathways in human bronchial epithelia. Mol Immunol 2024; 167:53-61. [PMID: 38359646 DOI: 10.1016/j.molimm.2024.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 02/03/2024] [Accepted: 02/05/2024] [Indexed: 02/17/2024]
Abstract
The spike protein of SARS-CoV-2 as well as its receptor binding domain (RBD) has been demonstrated to be capable of activating the release of pro-inflammatory mediators in endothelial cells and immune cells such as monocytes. However, the effects of spike protein or its RBD on airway epithelial cells and mechanisms underlying these effects have not been adequately characterized. Here, we show that the RBD of spike protein alone can induce bronchial epithelial inflammation in a manner of ATP/P2Y2 dependence. Incubation of human bronchial epithelia with RBD induced IL-6 and IL-8 release, which could be inhibited by antibody. The incubation of RBD also up-regulated the expression of inflammatory indicators such as ho-1 and mkp-1. Furthermore, ATP secretion was observed after RBD treatment, P2Y2 receptor knock down by siRNA significantly suppressed the IL-6 and IL-8 release evoked by RBD. Additionally, S-RBD elevated the phosphorylation level of ERK1/2, and the effect that PD98059 can inhibit the pro-inflammatory cytokine release suggested the participation of ERK1/2. These novel findings provide new evidence of SARS-CoV-2 on airway inflammation and introduce purinergic signaling as promising treatment target.
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Affiliation(s)
- Rui-Gang Zhang
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China.
| | - Xing-Jian Liu
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China
| | - Yu-Ling Guo
- First Clinical School, Guangdong Medical University, Zhanjiang, China
| | - Chun-Ling Chen
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China
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2
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Cheng B, Song X, Yin L, Lin J, Liu Z, Zhu Y, Wu H. HMOX1-overexpressing mesenchymal stem cell-derived exosomes facilitate diabetic wound healing by promoting angiogenesis and fibroblast function. Biochem Biophys Res Commun 2024; 690:149271. [PMID: 38006802 DOI: 10.1016/j.bbrc.2023.149271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/30/2023] [Accepted: 11/15/2023] [Indexed: 11/27/2023]
Abstract
Many scholars have suggested that exosomes (Exos) can carry active molecules to induce angiogenesis and thus accelerate diabetic wound healing. Heme oxygenase-1 (HO-1) encoded by the gene HMOX1 promotes wound healing in DM by enhancing angiogenesis. Nevertheless, whether HMOX1 regulates wound healing in DM through mesenchymal stem cell-derived exosomes (MSC-Exos) remains to be further explored. The primary isolated- and cultured-cells expressed MSC-specific marker proteins, and had low immunogenicity and multi-differentiation potential, which means that MSCs were successfully isolated in this study. Notably, HO-1 protein expression was significantly higher in Exo-HMOX1 than in Exos, indicating that HMOX1 could be delivered to Exos as an MSCs-secreted protein. After verifying the -Exo structure, fibroblasts, keratinocytes, and human umbilical vein endothelial cells (HUVECs) were incubated with Exo-HMOX1 or Exo, and the findings displayed that Exo-HMOX1 introduction promoted the proliferation and migration of fibroblasts, keratinocytes and the angiogenic ability of HUVECs in vitro study. After establishing diabetic wound model mice, PBS, Exo, and Exo-HMOX1 were subcutaneously injected into multiple sites on the 1st, 3rd, 7th, and 14th day, DM injected with Exo-HMOX1 showed faster wound healing, re-epithelialization, collagen deposition, and angiogenesis than those in PBS and Exo groups in vitro study. In summary, Exo-HMOX1 could enhance the activity of fibroblasts, keratinocytes, and HUVEC, and accelerate wound healing by promoting angiogenesis in DM.
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Affiliation(s)
- Bomin Cheng
- Chinese Medicine Health Management Center, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China.
| | - Xiaorong Song
- Chinese Medicine Health Management Center, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China.
| | - Lin Yin
- Thyroid Gland Breast Surgery, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China.
| | - Jiwei Lin
- Chinese Medicine Health Management Center, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China.
| | - Zhuochao Liu
- Chinese Medicine Health Management Center, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China.
| | - Yanping Zhu
- Chinese Medicine Health Management Center, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China.
| | - Haibin Wu
- Chinese Medicine Health Management Center, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China.
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3
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Liu XJ, Pang H, Long YQ, Wang JQ, Niu Y, Zhang RG. Pro-inflammatory action of formoterol in human bronchial epithelia. Mol Immunol 2023; 160:95-102. [PMID: 37413911 DOI: 10.1016/j.molimm.2023.06.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 06/19/2023] [Accepted: 06/26/2023] [Indexed: 07/08/2023]
Abstract
Despite the wide usage of β2-adrenoceptor agonists in asthma treatment, they do have side effects such as aggravating inflammation. We previously reported that isoprenaline induced Cl- secretion and IL-6 release via cAMP-dependent pathways in human bronchial epithelia, but the mechanisms underlying the inflammation-aggravation effects of β2-adrenoceptor agonists remain pooly understood. In this study, we investigated formoterol, a more specific β2-adrenoceptor agonist, -mediated signaling pathways involved in the production of IL-6 and IL-8 in 16HBE14o- human bronchial epithelia. The effects of formoterol were detected in the presence of PKA, exchange protein directly activated by cAMP (EPAC), cystic fibrosis transmembrane conductance regulator (CFTR), extracellular signal-regulated protein kinase (ERK)1/2 and Src inhibitors. The involvement of β-arrestin2 was determined using siRNA knockdown. Our results indicate that formoterol can induce IL-6 and IL-8 secretion in concentration-dependent manner. The PKA-specific inhibitor, H89, partially inhibited IL-6 release, but not IL-8. Another intracellular cAMP receptor, EPAC, was not involved in either IL-6 or IL-8 release. PD98059 and U0126, two ERK1/2 inhibitors, blocked IL-8 while attenuated IL-6 secretion induced by formoterol. Furthermore, formoterol-induced IL-6 and IL-8 release was attenuated by Src inhibitors, namely dasatinib and PP1, and CFTRinh172, a CFTR inhibitor. In addition, knockdown of β-arrestin2 by siRNA only suppressed IL-8 release when a high concentration of formoterol (1 μM) was used. Taken together, our results suggest that formoterol stimulates IL-6 and IL-8 release which involves PKA/Src/ERK1/2 and/or β-arrestin2 signaling pathways.
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Affiliation(s)
- Xing-Jian Liu
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China
| | - Hao Pang
- First Clinical School, Guangdong Medical University, Zhanjiang, China
| | - Yu-Qian Long
- First Clinical School, Guangdong Medical University, Zhanjiang, China
| | - Ji-Qing Wang
- First Clinical School, Guangdong Medical University, Zhanjiang, China
| | - Ya Niu
- School of Biomedical Sciences, The Chinese University of Hong Kong, New Territories, Hong Kong, China
| | - Rui-Gang Zhang
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China.
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Wu X, Wu L, Wu Y, Chen W, Chen J, Gong L, Yu J. Heme oxygenase-1 ameliorates endotoxin-induced acute lung injury by modulating macrophage polarization via inhibiting TXNIP/NLRP3 inflammasome activation. Free Radic Biol Med 2023; 194:12-22. [PMID: 36436727 DOI: 10.1016/j.freeradbiomed.2022.11.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/19/2022] [Accepted: 11/21/2022] [Indexed: 11/27/2022]
Abstract
Acute lung injury (ALI) remains a global public health issue without specific and effective treatment options available in the clinic. Alveolar macrophage polarization is involved in the initiation, development and progression of ALI; however, the underlying mechanism remains poorly understood. Heme oxygenase-1 (HO-1) acts as an antioxidant in pulmonary inflammation and has been demonstrated to be linked with the severity and prognosis of ALI. In this study, the therapeutic effects of HO-1 were examined, along with the mechanisms involved, mainly focusing on alveolar macrophage polarization. HO-1 depletion induced higher iNOS and CD86 (M1 phenotype) expression but was significantly decreased in Arg-1 and CD206 (M2 phenotype) expression in BALF alveolar macrophages after equivalent LPS stimulation. We also found that HO-1 deletion distinctly accelerated the expression of inflammasome-associated components NLRP3, ASC and caspase-1 in vivo and in vivo and in vitro. Moreover, on the basis of LPS for MH-S cells, levels of TXNIP, NLRP3, ASC and caspase-1 were increased and HO-1 depletion exacerbated these changes, whereas double depletion of HO-1 and TXNIP partially mitigated these elevations. Also, HO-1 knockdown induced more M1 phenotype and less M2 phenotype compared with LPS alone, whereas double silence of HO-1 and TXNIP partially changed the polarization state. Taken together, we demonstrated that HO-1 could modulate macrophage polarization via TXNIP/NLRP3 signaling pathway, which could be a potential therapeutic target for ALI treatment.
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Affiliation(s)
- Xiaoyang Wu
- School of Medicine, Nankai University, Tianjin, China
| | - Lili Wu
- Department of Anesthesiology and Critical Care Medicine, Tianjin Nankai Hospital, Tianjin Medical University, Tianjin, China
| | - Ya Wu
- Department of Anesthesiology and Critical Care Medicine, Tianjin Nankai Hospital, Tianjin Medical University, Tianjin, China
| | - Wei Chen
- Department of Anesthesiology and Critical Care Medicine, Tianjin Nankai Hospital, Tianjin Medical University, Tianjin, China
| | - Jinkun Chen
- Department of Anesthesiology and Critical Care Medicine, Tianjin Nankai Hospital, Tianjin Medical University, Tianjin, China
| | - Lirong Gong
- Department of Anesthesiology and Critical Care Medicine, Tianjin Nankai Hospital, Tianjin Medical University, Tianjin, China.
| | - Jianbo Yu
- Department of Anesthesiology and Critical Care Medicine, Tianjin Nankai Hospital, School of Medicine, Nankai University, Tianjin, China.
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Role of Carbon Monoxide in Oxidative Stress-Induced Senescence in Human Bronchial Epithelium. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:5199572. [PMID: 36193088 PMCID: PMC9526622 DOI: 10.1155/2022/5199572] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Accepted: 08/28/2022] [Indexed: 11/17/2022]
Abstract
Prolonged or excessive stimulation from inhaled toxins may cause oxidative stress and DNA damage that can lead to stress-induced senescence in epithelial cells, which can contribute to several airway diseases. Mounting evidence has shown carbon monoxide (CO) confers cytoprotective effects. We investigated the effects of CO on oxidative stress-induced senescence in human airway epithelium and elucidated the underlying molecular mechanisms. Here, CO pretreatment reduced H2O2-mediated increases in total reactive oxygen species (ROS) production and mitochondrial superoxide in a human bronchial epithelial cell line (BEAS-2B). H2O2 treatment triggered a premature senescence-like phenotype with enlarged and flattened cell morphology accompanied by increased SA-β-gal activity, cell cycle arrest in G0/G1, reduced cell viability, and increased transcription of senescence-associated secretory phenotype (SASP) genes. Additionally, exposure to H2O2 increased protein levels of cellular senescence markers (p53 and p21), reduced Sirtuin 3 (SIRT3) and manganese superoxide dismutase (MnSOD) levels, and increased p53 K382 acetylation. These H2O2-mediated effects were attenuated by pretreatment with a CO-containing solution. SIRT3 silencing induced mitochondrial superoxide production and triggered a senescence-like phenotype, whereas overexpression decreased mitochondrial superoxide production and alleviated the senescence-like phenotype. Air-liquid interface (ALI) culture of primary human bronchial cells, which becomes a fully differentiated pseudostratified mucociliary epithelium, was used as a model. We found that apical and basolateral exposure to H2O2 induced a vacuolated structure that impaired the integrity of ALI cultures, increased goblet cell numbers, decreased SCGB1A1+ club cell numbers, increased p21 protein levels, and increased SASP gene transcription, consistent with our observations in BEAS-2B cells. These effects were attenuated in the apical presence of a CO-containing solution. In summary, we revealed that CO has a pivotal role in epithelial senescence by regulating ROS production via the SIRT3/MnSOD/p53/p21 pathway. This may have important implications in the prevention and treatment of age-associated respiratory pathologies.
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Zhang RG, Niu Y, Pan KW, Pang H, Chen CL, Yip CY, Ko WH. β 2-Adrenoceptor Activation Stimulates IL-6 Production via PKA, ERK1/2, Src, and Beta-Arrestin2 Signaling Pathways in Human Bronchial Epithelia. Lung 2021; 199:619-627. [PMID: 34725715 PMCID: PMC8626360 DOI: 10.1007/s00408-021-00484-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 10/04/2021] [Indexed: 01/14/2023]
Abstract
OBJECTIVE β2-Adrenoceptor agonists are widely used to treat asthma because of their bronchial-dilation effects. We previously reported that isoprenaline, via the apical and basolateral β2-adrenoceptor, induced Cl- secretion by activating cyclic AMP (cAMP)-dependent pathways in human bronchial epithelia. Despite these results, whether and how the β2-adrenoceptor-mediated cAMP-dependent pathway contributes to pro-inflammatory cytokine release in human bronchial epithelia remains poorly understood. METHODS We investigated β2-adrenoceptor-mediated signaling pathways involved in the production of two pro-inflammatory cytokines, interleukin (IL)-6 and IL-8, in 16HBE14o- human bronchial epithelia. The effects of isoprenaline or formoterol were assessed in the presence of protein kinase A (PKA), exchange protein directly activated by cAMP (EPAC), Src, and extracellular signal-regulated protein kinase (ERK)1/2 inhibitors. The involvement of β-arrestin2 was examined using siRNA knockdown. RESULTS Isoprenaline and formoterol (both β2 agonists) induced IL-6, but not IL-8, release, which could be inhibited by ICI 118,551 (β2 antagonist). The PKA-specific inhibitor, H89, partially inhibited IL-6 release. Another intracellular cAMP receptor, EPAC, was not involved in IL-6 release. Isoprenaline-mediated IL-6 secretion was attenuated by dasatinib, a Src inhibitor, and PD98059, an ERK1/2 inhibitor. Isoprenaline treatment also led to ERK1/2 phosphorylation. In addition, knockdown of β-arrestin2 by siRNA specifically suppressed cytokine release when a high concentration of isoprenaline (1 mM) was used. CONCLUSION Our results suggest that activation of the β2-adrenoceptor in 16HBE14o- cells stimulated the PKA/Src/ERK1/2 and/or β-arrestin2 signaling pathways, leading to IL-6 release. Therefore, our data reveal that β2-adrenoceptor signaling plays a role in the immune regulation of human airway epithelia.
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Affiliation(s)
- Rui-Gang Zhang
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China
| | - Ya Niu
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China
| | - Ke-Wu Pan
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, N.T., China
| | - Hao Pang
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China
| | - Chun-Ling Chen
- Department of Physiology, Basic Medical School, Guangdong Medical University, Zhanjiang, China
| | - Chung-Yin Yip
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, N.T., China
| | - Wing-Hung Ko
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, N.T., China.
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Xu C, Song Y, Wang Z, Jiang J, Piao Y, Li L, Jin S, Li L, Zhu L, Yan G. Pterostilbene suppresses oxidative stress and allergic airway inflammation through AMPK/Sirt1 and Nrf2/HO-1 pathways. IMMUNITY INFLAMMATION AND DISEASE 2021; 9:1406-1417. [PMID: 34342160 PMCID: PMC8589405 DOI: 10.1002/iid3.490] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 07/02/2021] [Accepted: 07/06/2021] [Indexed: 12/21/2022]
Abstract
Introduction Pterostilbene (Pts) may be used for allergic asthma treatment. The AMPK/Sirt1 and Nrf2/HO‐1 pathways are potential targets for asthma treatement. However, the relationship between Pts and AMPK/Sirt1 and Nrf2/HO‐1 pathways in asthma is unclear. Herein, we aim to explore the pharmacological effects of Pts on oxidative stress and allergic inflammatory response as well as the mechanism involving AMPK/Sirt1 and Nrf2/HO‐1 pathways. Methods Asthma model was established in mice with ovalbumin (OVA). The model mice were treated by different concentrations of Pts. Lung pathological changes were observed through histological staining. In vitro, lipopolysaccharide (LPS)‐stimulated 16HBE cells were treated with Pts. The siAMPKα2, siSirt1 and siNrf2 knockdown, and treatment with compound C, EX‐527 or ML385 were also performed in 16HBE cells. Enzyme‐linked immunosorbent assay was used to detect interleukin‐4 (IL‐4), IL‐13, IL‐5, total and OVA specific immunoglobulin E (IgE), and interferon γ (IFN‐γ). Pneumonography was used to measure the airway hyperreactivity (AHR). Superoxide dismutase (SOD), catalase (CAT), and malondialdehyde (MDA) levels were also detected. Immunohistochemistry, Western blot and immunofluorescence were used to measure protein levels. Results Pts significantly attenuated lung inflammatory cell infiltration and goblet cell proliferation. Meanwhile, Pts treatment could reduce IL‐4, IL‐13, IL‐5, and IgE (total and OVA specific) levels in the asthma model mice. However, IFN‐γ in bronchoalveolar lavage fluid was elevated. In addition, Pts reduced AHR. We also found that Pts treatment promoted serum SOD and CAT, and reduced MDA. In vitro results showed that Pts treatment promoted iNOS, TNF‐α, COX‐2, IL‐1β, and IL‐6 expressions in 16HBE cells, prolonged G0/G1 phase of the cell cycle, and resulted in a shortened G2M phase. Moreover, we found that Pts promoted the phosphorylation of AMPK in 16HBE, and meanwhile inhibited the increase of ROS induced by LPS. Additionally, Pts treatment inhibited p‐AMPK, Sirt1, Nrf2 and HO‐1, which in turn leads to the alleviation of AMPK/Sirt1 and Nrf2/HO‐1 pathways. Conclusion Pts alleviated oxidative stress and allergic airway inflammation via regulation of AMPK/Sirt1and Nrf2/HO‐1 signaling pathways.
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Affiliation(s)
- Chang Xu
- Jilin Key Laboratory for Immune and Targeting Research on Common Allergic Diseases, Yanbian University, Yanji, Jilin, China.,Department of Anatomy Histology and Embryology, Yanbian University Medical College, Yanji, Jilin, China
| | - Yilan Song
- Jilin Key Laboratory for Immune and Targeting Research on Common Allergic Diseases, Yanbian University, Yanji, Jilin, China.,Department of Anatomy Histology and Embryology, Yanbian University Medical College, Yanji, Jilin, China
| | - Zhiguang Wang
- Jilin Key Laboratory for Immune and Targeting Research on Common Allergic Diseases, Yanbian University, Yanji, Jilin, China.,Department of Respiratory Medicine, Affiliated Hospital of Yanbian University, Yanji, Jilin, China
| | - Jingzhi Jiang
- Jilin Key Laboratory for Immune and Targeting Research on Common Allergic Diseases, Yanbian University, Yanji, Jilin, China.,Department of Anatomy Histology and Embryology, Yanbian University Medical College, Yanji, Jilin, China
| | - Yihua Piao
- Jilin Key Laboratory for Immune and Targeting Research on Common Allergic Diseases, Yanbian University, Yanji, Jilin, China.,Department of Intensive Care Unit, Affiliated Hospital of Yanbian University, Yanji, Jilin, China
| | - Li Li
- Jilin Key Laboratory for Immune and Targeting Research on Common Allergic Diseases, Yanbian University, Yanji, Jilin, China.,Department of Anatomy Histology and Embryology, Yanbian University Medical College, Yanji, Jilin, China
| | - Shan Jin
- Department of Dermatology, Yanbian University Hospital, Yanji, Jilin, China
| | - Liangchang Li
- Jilin Key Laboratory for Immune and Targeting Research on Common Allergic Diseases, Yanbian University, Yanji, Jilin, China.,Department of Anatomy Histology and Embryology, Yanbian University Medical College, Yanji, Jilin, China
| | - Lianhua Zhu
- Department of Dermatology, Yanbian University Hospital, Yanji, Jilin, China
| | - Guanghai Yan
- Jilin Key Laboratory for Immune and Targeting Research on Common Allergic Diseases, Yanbian University, Yanji, Jilin, China.,Department of Anatomy Histology and Embryology, Yanbian University Medical College, Yanji, Jilin, China
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Tift MS, Alves de Souza RW, Weber J, Heinrich EC, Villafuerte FC, Malhotra A, Otterbein LE, Simonson TS. Adaptive Potential of the Heme Oxygenase/Carbon Monoxide Pathway During Hypoxia. Front Physiol 2020; 11:886. [PMID: 32792988 PMCID: PMC7387684 DOI: 10.3389/fphys.2020.00886] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 06/30/2020] [Indexed: 01/15/2023] Open
Abstract
Heme oxygenase (HO) enzymes catalyze heme into biliverdin, releasing carbon monoxide (CO) and iron into circulation. These byproducts of heme degradation can have potent cytoprotective effects in the face of stressors such as hypoxia and ischemia-reperfusion events. The potential for exogenous use of CO as a therapeutic agent has received increasing attention throughout the past few decades. Further, HO and CO are noted as putatively adaptive in diving mammals and certain high-altitude human populations that are frequently exposed to hypoxia and/or ischemia-reperfusion events, suggesting that HO and endogenous CO afford an evolutionary advantage for hypoxia tolerance and are critical in cell survival and injury avoidance. Our goal is to describe the importance of examining HO and CO in several systems, the physiological links, and the genetic factors that underlie variation in the HO/CO pathway. Finally, we emphasize the ways in which evolutionary perspectives may enhance our understanding of the HO/CO pathway in the context of diverse clinical settings.
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Affiliation(s)
- Michael S. Tift
- Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC, United States
| | - Rodrigo W. Alves de Souza
- Department of Surgery, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, United States
| | - Janick Weber
- Department of Surgery, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, United States
| | - Erica C. Heinrich
- Division of Biomedical Sciences, University of California Riverside, School of Medicine, Riverside, CA, United States
| | - Francisco C. Villafuerte
- Laboratorio de Fisiología Comparada, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Atul Malhotra
- Division of Pulmonary, Critical Care, and Sleep Medicine, University of California San Diego, School of Medicine, San Diego, CA, United States
| | - Leo E. Otterbein
- Department of Surgery, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, United States
| | - Tatum S. Simonson
- Division of Pulmonary, Critical Care, and Sleep Medicine, University of California San Diego, School of Medicine, San Diego, CA, United States
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