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Zeng SG, Lin X, Liu JC, Zhou J. Hypoxia‑induced internalization of connexin 26 and connexin 43 in pulmonary epithelial cells is involved in the occurrence of non‑small cell lung cancer via the P53/MDM2 signaling pathway. Int J Oncol 2019; 55:845-859. [PMID: 31485592 PMCID: PMC6741836 DOI: 10.3892/ijo.2019.4867] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 04/16/2019] [Indexed: 12/18/2022] Open
Abstract
Reports have highlighted an association between connexins (CXs) or gap junction proteins and non-small cell lung cancer (NSCLC). In the present study, it was aimed to elucidate the regulatory mechanism of CX26 and CX43 under hypoxic conditions in NSCLC. Clinical samples were collected for analysis of CX26 and CX43 expression and clinical cancerization followed by quantification of CX26 and CX43 expression. Following the establishment of an in vitro hypoxia model, P53/murine double minute-2 (MDM2) signaling pathway-, proliferation- and epithelial-mesenchymal transition (EMT)-related genes were quantified to evaluate the influence of CX26 and CX43 on the biological functions of pulmonary epithelial cells in NSCLC. In addition, the proliferation and tumorigenicity of cancer cells were assessed by EdU staining and xenograft tumors, respectively. Decreased expression of CX26 and CX43 was found in cancer tissues compared with surrounding normal tissue. Hypoxia was shown to activate the P53/MDM2 axis and stimulate the downregulation, ubiquitination and degradation of CX26 and CX43, which were translocated from the membrane to the cytoplasm. Low levels of CX26 and CX43 were demonstrated to further promote EMT and the induction of the proliferation and tumorigenicity of cancer cells. These results were reflected by decreased E-cadherin expression and increased N-cadherin expression, along with increased cell migration, promoted cell proliferation ability and elevated relative protein expression of Oct4 and Nanog, and accelerated tumor growth, accompanied by a higher number of metastatic nodes. Taken together, the key observations of the present study demonstrate that the internalization of CX26 and CX43 promoted proliferation, EMT and migration and thus induced NSCLC via aberrant activation of the P53/MDM2 signaling pathway under hypoxic conditions.
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Affiliation(s)
- Shang-Gan Zeng
- Department of Thoracic Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Xiang Lin
- Department of Thoracic Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Ji-Chun Liu
- Departments of Cardio‑Thoracic Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Jin Zhou
- Department of Respiratory, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
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Li W, Wu F, Chen L, Li Q, Ma J, Li M, Shi Y. Carbon Monoxide Attenuates Lipopolysaccharides (LPS)-Induced Acute Lung Injury in Neonatal Rats via Downregulation of Cx43 to Reduce Necroptosis. Med Sci Monit 2019; 25:6255-6263. [PMID: 31429423 PMCID: PMC6713028 DOI: 10.12659/msm.917751] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Background Acute lung injury (ALI) is one of major causes of death in newborns, making it urgent to improve therapy. Administration of low dose carbon monoxide (CO) plays a protective role in ALI but the mechanisms are not fully understood. This study was designed to test the therapeutic effect of monoxide-releasing molecule 3 (MORM3) in lipopolysaccharide (LPS) induced neonatal ALI and the possibly associated molecular mechanisms. Material/Methods For this study, 3- to 8-day old Newborn Sprague-Dawley rats were subjected to intraperitoneal injection of 3 mg/kg LPS to induce ALI. Then animals received intraperitoneal injection of carbon monoxide-releasing molecules 3 (CORM3) (8 mg/kg) or inactive CORM3 (iCORM3) for 7 consecutive days. Lung tissues were collected for histological examination and total cell counts and protein content in bronchoalveolar lavage fluid (BALF) were measured. Expression of Cx43 and necroptosis-related markers were detected by quantitative real-time polymerase chain reaction (qRT-PCR) and western blot. Results LPS exposure induced significant lung injury indicated by histological damage, increased lung wet/dry weight ratio (W/D) and increased total cell counts and protein concentration in BALF. These changes were significantly ameliorated by administration of CORM3 but not iCORM3. LPS also increased necroptosis-related markers RIP1, RIP3, and MLKL and their elevation was blocked by CORM3. CORM3 administration ameliorated LPS induced elevation of Cx43 expression and adenoviral overexpression of Cx43 abolished lung protective effect of CORM3. CORM3 administration attenuated LPS induced activation of extracellular-signal-regulated kinase (ERK) and its protection against necroptosis was abolished by ERK inhibitor U0126. Conclusions CORM3 attenuates LPS-Induced ALI in neonatal rats and its lung protective effect might be through downregulation of Cx43 to attenuate ERK signaling and ameliorate necroptosis, suggesting CORM3 as a potential therapeutic drug for ALI in neonates.
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Affiliation(s)
- Wanwei Li
- Department of Pediatrics, Daping Hospital, Army Medical University, Chongqing, China (mainland)
| | - Fang Wu
- Department of Neonatology, Chongqing Angel Women's and Children's Hospital, Chongqing, China (mainland)
| | - Long Chen
- Department of Neonatology, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, China (mainland)
| | - Qian Li
- Department of Pediatrics, Daping Hospital, Army Medical University, Chongqing, China (mainland)
| | - Juan Ma
- Department of Pediatrics, Daping Hospital, Army Medical University, Chongqing, China (mainland)
| | - Mengchun Li
- Department of Pediatrics, Daping Hospital, Army Medical University, Chongqing, China (mainland)
| | - Yuan Shi
- Department of Pediatrics, Daping Hospital, Army Medical University, Chongqing, China (mainland).,Department of Neonatology, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, China (mainland)
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Weber B, Mendler MR, Lackner I, von Zelewski A, Höfler S, Baur M, Braun CK, Hummler H, Schwarz S, Pressmar J, Kalbitz M. Lung injury after asphyxia and hemorrhagic shock in newborn piglets: Analysis of structural and inflammatory changes. PLoS One 2019; 14:e0219211. [PMID: 31276543 PMCID: PMC6611609 DOI: 10.1371/journal.pone.0219211] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 06/18/2019] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE Asphyxia of newborns is a severe and frequent challenge of the peri- and postnatal period. The purpose of this study was to study early morphological, immunological and structural alterations in lung tissue after asphyxia and hemorrhage (AH). METHODS 44 neonatal piglets (age 32 hrs) underwent asphyxia and hemorrhage (AH) and were treated according to the international liaison committee of resuscitation (ILCOR) guidelines. For this study, 15 piglets (blood transfusion (RBC) n = 9; NaCl n = 6, mean age 31 hrs) were randomly picked. 4 hours after ROSC (return of spontaneous circulation), lung tissue and blood samples were collected. RESULTS An elevation of myeloperoxidase (MPO) activity was observed 4 hrs after AH accompanied by an increase of surfactant D after RBC treatment. After AH tight junction proteins Claudin 18 and junctional adhesion molecule 1 (JAM1) were down-regulated, whereas Occludin was increased. Furthermore, after AH and RBC treatment dephosphorylated active form of Connexin 43 was increased. CONCLUSIONS AH in neonatal pigs is associated with early lung injury, inflammation and alterations of tight junctions (Claudin, Occludin, JAM-1) and gap junctions (Connexin 43) in lung tissue, which contributes to the development of lung edema and impaired function.
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Affiliation(s)
- Birte Weber
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, Center of Surgery, University of Ulm, Ulm, Baden-Württemberg, Germany
| | - Marc Robin Mendler
- Division of Neonatology and Pediatric Critical Care, Department of Pediatrics and Adolescent Medicine, University of Ulm, Ulm, Baden-Württemberg, Germany
| | - Ina Lackner
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, Center of Surgery, University of Ulm, Ulm, Baden-Württemberg, Germany
| | - Alexander von Zelewski
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, Center of Surgery, University of Ulm, Ulm, Baden-Württemberg, Germany
| | - Severin Höfler
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, Center of Surgery, University of Ulm, Ulm, Baden-Württemberg, Germany
| | - Meike Baur
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, Center of Surgery, University of Ulm, Ulm, Baden-Württemberg, Germany
| | - Christian Karl Braun
- Institute of Clinical and Experimental Trauma-Immunology, University Hospital of Ulm, Ulm, Baden-Württemberg, Germany
| | - Helmut Hummler
- Division of Neonatology and Pediatric Critical Care, Department of Pediatrics and Adolescent Medicine, University of Ulm, Ulm, Baden-Württemberg, Germany
- Division of Neonatology, Department of Pediatrics, Sidra Medicine, Doha, Qatar
| | - Stephan Schwarz
- Division of Neonatology and Pediatric Critical Care, Department of Pediatrics and Adolescent Medicine, University of Ulm, Ulm, Baden-Württemberg, Germany
| | - Jochen Pressmar
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, Center of Surgery, University of Ulm, Ulm, Baden-Württemberg, Germany
| | - Miriam Kalbitz
- Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, Center of Surgery, University of Ulm, Ulm, Baden-Württemberg, Germany
- * E-mail:
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Yuan JJ, Zhang XT, Bao YT, Chen XJ, Shu YZ, Chen JL, Chen W, Du B, Pang QF. Heme oxygenase-1 participates in the resolution of seawater drowning-induced acute respiratory distress syndrome. Respir Physiol Neurobiol 2018; 247:12-19. [DOI: 10.1016/j.resp.2017.08.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 08/17/2017] [Accepted: 08/17/2017] [Indexed: 12/25/2022]
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Jin F, Li C. Seawater-drowning-induced acute lung injury: From molecular mechanisms to potential treatments. Exp Ther Med 2017; 13:2591-2598. [PMID: 28587319 PMCID: PMC5450642 DOI: 10.3892/etm.2017.4302] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 01/26/2017] [Indexed: 01/11/2023] Open
Abstract
Drowning is a crucial public safety problem and is the third leading cause of accidental fatality, claiming ~372,000 lives annually, worldwide. In near-drowning patients, acute lung injury (ALI) or acute respiratory distress syndrome (ARDS) is one of the most common complications. Approximately 1/3 of near-drowning patients fulfill the criteria for ALI or ARDS. In the present article, the current literature of near-drowning, pathophysiologic changes and the molecular mechanisms of seawater-drowning-induced ALI and ARDS was reviewed. Seawater is three times more hyperosmolar than plasma, and following inhalation of seawater the hyperosmotic seawater may cause serious injury in the lung and alveoli. The perturbing effects of seawater may be primarily categorized into insufficiency of pulmonary surfactant, blood-air barrier disruption, formation of pulmonary edema, inflammation, oxidative stress, autophagy, apoptosis and various other hypertonic stimulation. Potential treatments for seawater-induced ALI/ARDS were also presented, in addition to suggestions for further studies. A total of nine therapeutic strategies had been tested and all had focused on modulating the over-activated immunoreactions. In conclusion, seawater drowning is a complex injury process and the exact mechanisms and potential treatments require further exploration.
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Affiliation(s)
- Faguang Jin
- Department of Respiratory and Critical Care Medicine, Tangdu Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710038, P.R. China
| | - Congcong Li
- Department of Respiratory and Critical Care Medicine, Tangdu Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710038, P.R. China
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