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Noh H, Yoon S, Kim SH, Kim J, Seo JS, Kim JJ, Park IH, Oh J, Bae JY, Lee GE, Woo SJ, Seo SM, Kim NW, Lee YW, Jang HJ, Hong SM, An SH, Lyoo KS, Yeom M, Lee H, Jung B, Yoon SW, Kang JA, Seok SH, Lee YJ, Kim SY, Kim YB, Hwang JY, On D, Lim SY, Kim SP, Jang JY, Lee H, Kim K, Lee HJ, Kim HB, Kim SB, Park JW, Jeong DG, Song D, Choi KS, Lee HY, Choi YK, Choi JA, Song M, Park MS, Seo JY, Shin JS, Yun JW, Nam KT, Seong JK. Establishment of multicenter COVID-19 therapeutics preclinical test system in Republic of Korea. Pulm Pharmacol Ther 2023; 80:102189. [PMID: 36634813 PMCID: PMC9829441 DOI: 10.1016/j.pupt.2023.102189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 01/03/2023] [Accepted: 01/08/2023] [Indexed: 01/11/2023]
Abstract
Throughout the recent COVID-19 pandemic, South Korea led national efforts to develop vaccines and therapeutics for SARS-CoV-2. The project proceeded as follows: 1) evaluation system setup (including Animal Biosafety Level 3 (ABSL3) facility alliance, standardized nonclinical evaluation protocol, and laboratory information management system), 2) application (including committee review and selection), and 3) evaluation (including expert judgment and reporting). After receiving 101 applications, the selection committee reviewed pharmacokinetics, toxicity, and efficacy data and selected 32 final candidates. In the nonclinical efficacy test, we used golden Syrian hamsters and human angiotensin-converting enzyme 2 transgenic mice under a cytokeratin 18 promoter to evaluate mortality, clinical signs, body weight, viral titer, neutralizing antibody presence, and histopathology. These data indicated eight new drugs and one repositioned drug having significant efficacy for COVID-19. Three vaccine and four antiviral drugs exerted significant protective activities against SARS-CoV-2 pathogenesis. Additionally, two anti-inflammatory drugs showed therapeutic effects on lung lesions and weight loss through their mechanism of action but did not affect viral replication. Along with systematic verification of COVID-19 animal models through large-scale studies, our findings suggest that ABSL3 multicenter alliance and nonclinical evaluation protocol standardization can promote reliable efficacy testing against COVID-19, thus expediting medical product development.
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Affiliation(s)
- Hyuna Noh
- Korea Mouse Phenotyping Center, Seoul National University, Seoul, 08826, Republic of Korea
| | - Suhyeon Yoon
- Korea Mouse Phenotyping Center, Seoul National University, Seoul, 08826, Republic of Korea
| | - Sung-Hee Kim
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jiseon Kim
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jung Seon Seo
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jeong Jin Kim
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - In Ho Park
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea,Institute of Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jooyeon Oh
- Department of Microbiology, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Joon-Yong Bae
- Department of Microbiology, Institute for Viral Diseases, Biosafety Center, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Gee Eun Lee
- Department of Microbiology, Institute for Viral Diseases, Biosafety Center, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Sun-Je Woo
- Science Unit, International Vaccine Institute, Seoul, 08826, Republic of Korea
| | - Sun-Min Seo
- Department of Laboratory Animal Medicine, College of Veterinary Medicine, Konkuk University, Seoul, 05029, Republic of Korea
| | - Na-Won Kim
- Department of Laboratory Animal Medicine, College of Veterinary Medicine, Konkuk University, Seoul, 05029, Republic of Korea
| | - Youn Woo Lee
- Department of Nuclear Medicine, Seoul National University Bundang Hospital, Seongnam, 13488, Republic of Korea
| | - Hui Jeong Jang
- Department of Nuclear Medicine, Seoul National University Bundang Hospital, Seongnam, 13488, Republic of Korea
| | - Seung-Min Hong
- Laboratory of Avian Diseases, BK21 plus Program for Veterinary Science and Research Institute for Veterinary Science, College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea
| | - Se-Hee An
- Laboratory of Avian Diseases, BK21 plus Program for Veterinary Science and Research Institute for Veterinary Science, College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea
| | - Kwang-Soo Lyoo
- Korea Zoonosis Research Institute, Chonbuk National University, Iksan, 54531, Republic of Korea
| | - Minjoo Yeom
- Department of Pharmacy, College of Pharmacy, Korea University, Sejong, 30019, Republic of Korea
| | - Hanbyeul Lee
- Department of Pharmacy, College of Pharmacy, Korea University, Sejong, 30019, Republic of Korea
| | - Bud Jung
- Department of Pharmacy, College of Pharmacy, Korea University, Sejong, 30019, Republic of Korea
| | - Sun-Woo Yoon
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, Republic of Korea
| | - Jung-Ah Kang
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, Republic of Korea
| | - Sang-Hyuk Seok
- Division of Biomedical Convergence, College of Biomedical Science, Kangwon National University, ChunCheon, 24341, Republic of Korea
| | - Yu Jin Lee
- Division of Biomedical Convergence, College of Biomedical Science, Kangwon National University, ChunCheon, 24341, Republic of Korea
| | - Seo Yeon Kim
- Preclinical Research Center, Seoul National University Bundang Hospital, Seongnam, 13488, Republic of Korea
| | - Young Been Kim
- Preclinical Research Center, Seoul National University Bundang Hospital, Seongnam, 13488, Republic of Korea
| | - Ji-Yeon Hwang
- Preclinical Research Center, Seoul National University Bundang Hospital, Seongnam, 13488, Republic of Korea
| | - Dain On
- Korea Mouse Phenotyping Center, Seoul National University, Seoul, 08826, Republic of Korea,Laboratory of Developmental Biology and Genomics, Research Institute for Veterinary Science, and BK21 PLUS Program for Creative Veterinary Science Research, College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea
| | - Soo-Yeon Lim
- Korea Mouse Phenotyping Center, Seoul National University, Seoul, 08826, Republic of Korea
| | - Sol Pin Kim
- Korea Mouse Phenotyping Center, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ji Yun Jang
- Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Gyeonggi, 10408, Republic of Korea,College of Pharmacy, Dongguk University, Seoul, 04620, Republic of Korea
| | - Ho Lee
- Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Gyeonggi, 10408, Republic of Korea
| | - Kyoungmi Kim
- Department of Biomedical Sciences and Department of Physiology, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Hyo-Jung Lee
- Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
| | - Hong Bin Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, 13620, Republic of Korea
| | - Sun Bean Kim
- Division of Infectious Diseases, Department of Internal Medicine, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Jun Won Park
- Division of Biomedical Convergence, College of Biomedical Science, Kangwon National University, ChunCheon, 24341, Republic of Korea
| | - Dae Gwin Jeong
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, Republic of Korea
| | - Daesub Song
- Department of Pharmacy, College of Pharmacy, Korea University, Sejong, 30019, Republic of Korea
| | - Kang-Seuk Choi
- Laboratory of Avian Diseases, BK21 plus Program for Veterinary Science and Research Institute for Veterinary Science, College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ho-Young Lee
- Department of Nuclear Medicine, Seoul National University Bundang Hospital, Seongnam, 13488, Republic of Korea
| | - Yang-Kyu Choi
- Department of Laboratory Animal Medicine, College of Veterinary Medicine, Konkuk University, Seoul, 05029, Republic of Korea
| | - Jung-ah Choi
- Science Unit, International Vaccine Institute, Seoul, 08826, Republic of Korea
| | - Manki Song
- Science Unit, International Vaccine Institute, Seoul, 08826, Republic of Korea
| | - Man-Seong Park
- Department of Microbiology, Institute for Viral Diseases, Biosafety Center, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Jun-Young Seo
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jeon-Soo Shin
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea,Institute of Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea,Department of Microbiology, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Jun-Won Yun
- Laboratory of Veterinary Toxicology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul, 08826, Republic of Korea,Corresponding author. Laboratory of Veterinary Toxicology, College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ki Taek Nam
- Severance Biomedical Science Institute, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea,Corresponding author
| | - Je Kyung Seong
- Korea Mouse Phenotyping Center, Seoul National University, Seoul, 08826, Republic of Korea,Laboratory of Developmental Biology and Genomics, Research Institute for Veterinary Science, and BK21 PLUS Program for Creative Veterinary Science Research, College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea,Interdisciplinary Program for Bioinformatics, Program for Cancer Biology and BIO-MAX/N-Bio Institute, Seoul National University, Seoul, 08826, Republic of Korea,Corresponding author. Korea Mouse Phenotyping Center, Seoul National University, Seoul, 08826, Republic of Korea
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Uemasu K, Tanabe N, Tanimura K, Hasegawa K, Mizutani T, Hamakawa Y, Sato S, Ogawa E, Thomas MJ, Ikegami M, Muro S, Hirai T, Sato A. Serine Protease Imbalance in the Small Airways and Development of Centrilobular Emphysema in Chronic Obstructive Pulmonary Disease. Am J Respir Cell Mol Biol 2020; 63:67-78. [PMID: 32101459 DOI: 10.1165/rcmb.2019-0377oc] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Epithelial dysfunction in the small airways may cause the development of emphysema in chronic obstructive pulmonary disease. C/EBPα (CCAAT/enhancer binding protein-α), a transcription factor, is required for lung maturation during development, and is also important for lung homeostasis after birth, including the maintenance of serine protease/antiprotease balance in the bronchiolar epithelium. This study aimed to show the roles of C/EBPα in the distal airway during chronic cigarette smoke exposure in mice and in the small airways in smokers. In a model of chronic smoke exposure using epithelial cell-specific C/EBPα-knockout mice, significant pathological phenotypes, such as higher protease activity, impaired ciliated cell regeneration, epithelial cell barrier dysfunction via reduced zonula occludens-1 (Zo-1), and decreased alveolar attachments, were found in C/EBPα-knockout mice compared with control mice. We found that Spink5 (serine protease inhibitor kazal-type 5) gene (encoding lymphoepithelial Kazal-type-related inhibitor [LEKTI], an anti-serine protease) expression in the small airways is a key regulator of protease activity in this model. Finally, we showed that daily antiprotease treatment counteracted the phenotypes of C/EBPα-knockout mice. In human studies, CEBPA (CCAAT/enhancer binding protein-α) gene expression in the lung was downregulated in patients with emphysema, and six smokers with centrilobular emphysema (CLE) showed a significant reduction in LEKTI in the small airways compared with 22 smokers without CLE. LEKTI downregulation in the small airways was associated with disease development during murine small airway injury and CLE in humans, suggesting that LEKTI might be a key factor linking small airway injury to the development of emphysema.
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Affiliation(s)
- Kiyoshi Uemasu
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Naoya Tanabe
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kazuya Tanimura
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Koichi Hasegawa
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tatsushi Mizutani
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yoko Hamakawa
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Susumu Sato
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Emiko Ogawa
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Health Administration Center, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Matthew J Thomas
- Department of Immunology and Respiratory Disease Research, Boehringer Ingelheim Pharma GmbH & Ko KG, Biberach an der Riss, Germany
| | - Machiko Ikegami
- Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio; and
| | - Shigeo Muro
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Department of Respiratory Medicine, Nara Medical University, Kashihara, Nara, Japan
| | - Toyohiro Hirai
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Atsuyasu Sato
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Lin J, Li J, Shu M, Wu W, Zhang W, Dou Q, Wu J, Zeng X. The rCC16 Protein Protects Against LPS-Induced Cell Apoptosis and Inflammatory Responses in Human Lung Pneumocytes. Front Pharmacol 2020; 11:1060. [PMID: 32760279 PMCID: PMC7371929 DOI: 10.3389/fphar.2020.01060] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 06/30/2020] [Indexed: 01/11/2023] Open
Abstract
Objective Our previous clinical study showed that low lung levels of CC16 strongly influence the occurrence and development of ARDS. The aim of the present study was to evaluate the therapeutic effect of rCC16 on LPS-induced inflammation in A549 cells and to determine its mechanism. Methods Cell apoptosis and inflammation was induced by LPS stimulation. The cytotoxic effect of rCC16 was evaluated using the MTT assay. Cytokine levels were determined using enzyme-linked immunosorbent assays. The molecular mechanism of rCC16 was investigated by analyzing relevant signaling pathways. Results The LPS treatment of A549 cells significantly decreased cell viability, increased the levels of the apoptotic proteins Bax, Bak and Cleaved Caspase-3, the secretion of inflammatory cytokines, and the expression levels of TLR4, p-NF/κB, MAPK proteins. While the levels of Bcl-2, p-AKT, p-mTOR, p-ERK1/2, NF/κB, p-AMPK, and p-p38 were significantly decreased in LPS-treated A549 cells. Our experimental results also confirmed that rCC16 inhibited LPS-induced apoptosis, promoted A549 cell proliferation by activating the PI3K/AKT/mTOR/ERK1/2 pathway, and inhibited the release of certain inflammatory factors, especially HMGB1, through dephosphorylation and inactivation of the TLR4/NF-κB/AMPK signaling pathways. Conclusion These results highlight the potential utility of CC16 as an important cytokine for the prevention or treatment of inflammation and show that CC16 may play an important role in the future clinical treatment of ARDS.
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Affiliation(s)
- Jinle Lin
- Department of Emergency Medicine, Shenzhen Baoan First People's Hospital, Nanfang Medical University, Shenzhen, China.,Department of Respiratory and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Science, Guangzhou, China
| | - Jiemei Li
- Center Laboratory of Longhua Branch and Department of Infectious Disease, Shenzhen People's Hospital (The Second Clinical Medical College, Jinan University; The First Affiliated Hospital, Southern University of Science and Technology), Shenzhen, China
| | - Min Shu
- Emergency Department, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
| | - Weigang Wu
- Center Laboratory of Longhua Branch and Department of Infectious Disease, Shenzhen People's Hospital (The Second Clinical Medical College, Jinan University; The First Affiliated Hospital, Southern University of Science and Technology), Shenzhen, China
| | - Wenwu Zhang
- Department of Emergency Medicine, Shenzhen Baoan First People's Hospital, Nanfang Medical University, Shenzhen, China
| | - Qingli Dou
- Department of Emergency Medicine, Shenzhen Baoan First People's Hospital, Nanfang Medical University, Shenzhen, China
| | - Jian Wu
- Department of Respiratory and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Science, Guangzhou, China
| | - Xiaobin Zeng
- Center Laboratory of Longhua Branch and Department of Infectious Disease, Shenzhen People's Hospital (The Second Clinical Medical College, Jinan University; The First Affiliated Hospital, Southern University of Science and Technology), Shenzhen, China.,Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Medicine School of Shenzhen University, Shenzhen, China
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Wang N, Li Q, Liu H, Lin L, Han W, Hao W. Role of C/EBPα hypermethylation in diesel engine exhaust exposure-induced lung inflammation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 183:109500. [PMID: 31450033 DOI: 10.1016/j.ecoenv.2019.109500] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 07/27/2019] [Accepted: 07/30/2019] [Indexed: 06/10/2023]
Abstract
Exposure to diesel engine exhaust (DEE) impairs lung function. But the underlying mechanisms are still not fully understood. The aim of this study was to investigate the effects of long-term DEE exposure on lung inflammation and the underlying mechanisms. Sprague-Dawley male rats were exposed to DEE with 3 mg/m3 of diesel exhaust particles (DEP) for 12 weeks. Then urine, blood, bronchoalveolar lavage fluid (BALF), and lung tissue were collected for the determination of biochemistry indexes, DNA methylation status, and histological changes in the lung. The results showed that the metabolites of polycyclic aromatic hydrocarbons (PAHs) 2-hydroxyphenanthrene (2-OHPh) and 9-OHPh, and 8-hydroxy-2'-deoxyguanosine (8-OHdG), and malondialdehyde (MDA) level were higher in urine of DEE-exposed rats than control group. The level of proinflammatory cytokines IL-8, IL-6, and TNF-α was significantly higher in serum (1.8, 3.5, and nearly 1.0-fold increase, respectively), BALF (2.2, 3.8, and 2.0-fold increase, respectively) and lung tissues (3.5, 4.3, and 2.4-fold increase, respectively) of DEE-exposed rats than control group. While the level of clara cell secretory protein (CC16) and pulmonary surfactant protein D (SP-D) with anti-inflammatory property was obviously lower in serum (reduction of 29% and 38%, respectively), BALF (reduction of 50% and 46%, respectively) and lung tissues (reduction of 50% and 55%, respectively) of DEE-exposed rats than control group. Exposure to DEE also resulted in significant increases in total white blood cell (WBC), neutrophil, eosinophil, and lymphocyte number in BALF. Airway inflammation and remolding were apparent in DEE group. The methylation level of CCAAT/enhancer-binding protein alpha (C/EBPα) promoter was markedly increased (about 3.2-fold increase), and its mRNA and protein expression were significantly decreased (about 62% and 68% decrease, respectively) in the lungs of DEE-exposed rats compared with the group. Further, cell experiments were performed to investigate the relationship between C/EBPα and CC16, and CC16 function under DEP conditions. The results showed that DEP inhibited CC16 expression via methylation of C/EBPα promoter, and the increase of CC16 level significantly relieved the proinflammatory effects caused by DEP exposure. In conclusion, our data indicated that long-term exposure to DEE can cause lung inflammation, at least in part via methylation of C/EBPα promoter, and inhibition of CC16 expression.
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Affiliation(s)
- Ning Wang
- Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, 266011, China
| | - Qinghai Li
- Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, 266011, China
| | - Hong Liu
- Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, 266011, China
| | - Li Lin
- Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, 266011, China
| | - Wei Han
- Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, 266011, China.
| | - Wanming Hao
- Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, 266011, China.
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Zhu L, An L, Ran D, Lizarraga R, Bondy C, Zhou X, Harper RW, Liao SY, Chen Y. The Club Cell Marker SCGB1A1 Downstream of FOXA2 is Reduced in Asthma. Am J Respir Cell Mol Biol 2019; 60:695-704. [PMID: 30576223 PMCID: PMC6543749 DOI: 10.1165/rcmb.2018-0199oc] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 12/21/2018] [Indexed: 01/08/2023] Open
Abstract
Human SCGB1A1 protein has been shown to be significantly reduced in BAL, sputum, and serum from humans with asthma as compared with healthy individuals. However, the mechanism of this reduction and its functional impact have not been entirely elucidated. By mining online datasets, we found that the mRNA of SCGB1A1 was significantly repressed in brushed human airway epithelial cells from individuals with asthma, and this repression appeared to be associated with reduced expression of FOXA2. Consistently, both Scgb1A1 and FoxA2 were downregulated in an ovalbumin-induced mouse model of asthma. Furthermore, compared with wild-type mice, Scgb1a1 knockout mice had increased airway hyperreactivity and inflammation when they were exposed to ovalbumin, confirming the antiinflammatory role of Scgb1a1 in protection against asthma phenotypes. To search for potential asthma-related stimuli of SCGB1A1 repression, we tested T-helper cell type 2 cytokines. Both IL-4 and IL-13 repressed epithelial expression of SCGB1A1 and FOXA2. Importantly, infection of epithelial cells with human rhinovirus similarly reduced expression of these two genes, which suggests that FOXA2 may be the common regulator of SCGB1A1. To establish the causal role of reduced FOXA2 in SCGB1A1 repression, we demonstrated that FOXA2 was required for SCGB1A1 expression at baseline. FOXA2 overexpression was sufficient to drive promoter activity and expression of SCGB1A1 and was also able to restore the repressed SCGB1A1 expression in IL-13-treated or rhinovirus-infected cells. Taken together, these findings suggest that low levels of epithelial SCGB1A1 in asthma are caused by reduced FOXA2 expression.
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Affiliation(s)
- Lingxiang Zhu
- Department of Pharmacology and Toxicology, School of Pharmacy
| | - Lingling An
- Department of Epidemiology Biostatistics
- Interdisciplinary Program in Statistics
- Department of Biosystems Engineering, and
| | - Di Ran
- Department of Epidemiology Biostatistics
| | - Rosa Lizarraga
- Department of Pharmacology and Toxicology, School of Pharmacy
| | - Cheryl Bondy
- Department of Pharmacology and Toxicology, School of Pharmacy
| | - Xu Zhou
- Department of Pharmacology and Toxicology, School of Pharmacy
| | - Richart W. Harper
- Department of Internal Medicine, University of California, Davis, California
| | - Shu-Yi Liao
- Department of Internal Medicine, University of California, Davis, California
| | - Yin Chen
- Department of Pharmacology and Toxicology, School of Pharmacy
- Asthma and Airway Disease Research Center, University of Arizona, Tucson, Arizona; and
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Yang J, Chen J. Developmental programs of lung epithelial progenitors: a balanced progenitor model. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2014; 3:331-47. [PMID: 25124755 DOI: 10.1002/wdev.141] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 04/17/2014] [Accepted: 05/04/2014] [Indexed: 01/17/2023]
Abstract
UNLABELLED The daunting task of lung epithelium development is to transform a cluster of foregut progenitors into a three-dimensional (3D) tubular network with distinct cell types distributed at their appropriate locations. A complete understanding of lung development needs to address not only how, but also where, different cell types form. We propose that the lung epithelium forms through regulated deployment of three developmental programs: branching morphogenesis to expand progenitors and build a tree-like tubular network, airway differentiation to specify cells for the proximal conducting airways, and alveolar differentiation to specify cells for the peripheral gas exchange region. Each developmental program has its unique morphological features and molecular control mechanisms; their spatiotemporal coordination can be accounted for in a balanced progenitor model where progenitors balance between alternative developmental programs in response to spatiotemporal cues. This model integrates progenitor morphogenesis and differentiation, and provides new insights to lung immaturity in preterm birth and lung evolution. Advanced gene targeting and 3D imaging tools are needed to achieve a comprehensive understanding of lung epithelial progenitors on molecular, cellular, and morphological levels. For further resources related to this article, please visit the WIREs website. CONFLICT OF INTEREST The authors have declared no conflicts of interest for this article.
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Affiliation(s)
- Jun Yang
- Department of Pulmonary Medicine, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
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Sato A, Yamada N, Ogawa Y, Ikegami M. CCAAT/enhancer-binding protein-α suppresses lung tumor development in mice through the p38α MAP kinase pathway. PLoS One 2013; 8:e57013. [PMID: 23437297 PMCID: PMC3577786 DOI: 10.1371/journal.pone.0057013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Accepted: 01/16/2013] [Indexed: 01/02/2023] Open
Abstract
The transcription factor CCAAT/enhancer-binding protein α (C/EBPα) is a basic leucine zipper transcription factor and is expressed in alveolar type II cells, alveolar macrophages and Clara cells in the lung. Although decrease or absence of C/EBPα expression in human non-small cell lung cancer suggests a possible role of C/EBPα as a lung tumor suppressor, there is no direct proof for this hypothesis. In this study, we investigated, for the first time, the role of C/EBPα in lung tumors in vivo using transgenic mice with lung epithelial specific conditional deletion of Cebpa (Cebpα(Δ/Δ) mice) and a urethane-induced lung tumor model. C/EBPα expression in the lung was dispensable, and its deletion was not oncogenic under unstressed conditions. However, at 28 wk after urethane injection, the number and size of tumors and the tumor burden were significantly higher in Cebpα(Δ/Δ) mice than in littermate control mice. Urethane-injected Cebpα(Δ/Δ) mice showed highly proliferative adenomas and adenocarcinomas in the lung, and survival time after urethane-injection was significantly shorter than that in control mice. In control mice, C/EBPα was strongly induced in the tumor tissues at 28 weeks after urethane-injection, but became weakened or absent as tumors progressed after long-term observation for over 1 year. Using intraperitoneal injection of p38 inhibitor (SB203580), we demonstrated that the induction of C/EBPα is strongly regulated by the p38 MAP kinase in murine alveolar epithelial cells. A high correlation was demonstrated between the expression of C/EBPα and p38α MAP kinase in tumor cells, suggesting that C/EBPα silencing in tumor cells is caused by down-regulation of p38α MAP kinase. In conclusion, the role of C/EBPα as a lung tumor suppressor was demonstrated for the first time in the present study, and the extinguished C/EBPα expression through p38α inactivation leads tumor promotion and progression.
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Affiliation(s)
- Atsuyasu Sato
- Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States of America
| | - Norishige Yamada
- Division of Reproductive Sciences, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States of America
| | - Yuya Ogawa
- Division of Reproductive Sciences, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States of America
| | - Machiko Ikegami
- Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States of America
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Zhang C, Chi YL, Wang PY, Wang YQ, Zhang YX, Deng J, Lv CJ, Xie SY. miR-511 and miR-1297 inhibit human lung adenocarcinoma cell proliferation by targeting oncogene TRIB2. PLoS One 2012; 7:e46090. [PMID: 23071539 PMCID: PMC3465292 DOI: 10.1371/journal.pone.0046090] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2012] [Accepted: 08/27/2012] [Indexed: 01/05/2023] Open
Abstract
microRNAs (miRNAs) are small noncoding RNAs that regulate genes and contribute to many kinds of human diseases, including cancer. Two miRNAs, miR-511 and miR-1297, were investigated for a possible role in adenocarcinoma based on predicted binding sites for the TRIB2 oncogene by microRNA analysis software, and the pcDNA-GFP-TRIB2-3'UTR vector was constructed to investigate the interaction between TRIB2 and miR-511/1297 in the adenocarcinoma cell line A549. Green fluorescent protein (GFP) expression was estimated by fluorescence microscopy and flow cytometry after A549 cells were co-transfected with miR-511 (or miR-1297) and pcDNA-GFP-TRIB2-3'UTR vector. The expression of GFP in the miR-511- and miR-1297-treated cells was significantly downregulated in contrast with the negative-control (NC) miRNA-treated cells. The decreased expression of TRIB2 was further detected after miR-511 (or miR-1297) treatment by western blotting. The MTT test showed inhibition of A549 cell proliferation and Annexin V-FITC/PI dual staining showed increased apoptosis in the miR-511- and miR-1297-treated cells compared to the NC cultures. A transcription factor downstream of TRIB2, the CCAAT/enhancer-binding protein alpha (C/EBPα), was expression at higher levels after miR-511 (or miR-1297) decreasing TRIB2 expression. Our results illustrate that miR-511 and miR-1297 act as tumor suppressor genes, which could suppress A549 cell proliferation in vitro and in vivo by suppressing TRIB2 and further increasing C/EBPα expression.
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Affiliation(s)
- Chao Zhang
- Key Laboratory of Tumour Molecular Biology in Binzhou Medical University, Department of Biochemistry and Molecular Biology, Binzhou Medical University, YanTai, ShanDong, P.R.China
| | - Yong Liang Chi
- Shandong China Traditional Medical Affiliated Hospital, Ji Nan, P.R.China
| | - Ping Yu Wang
- Key Laboratory of Tumour Molecular Biology in Binzhou Medical University, Department of Biochemistry and Molecular Biology, Binzhou Medical University, YanTai, ShanDong, P.R.China
| | - Ya Qi Wang
- Key Laboratory of Tumour Molecular Biology in Binzhou Medical University, Department of Biochemistry and Molecular Biology, Binzhou Medical University, YanTai, ShanDong, P.R.China
| | - Yan Xia Zhang
- Key Laboratory of Tumour Molecular Biology in Binzhou Medical University, Department of Biochemistry and Molecular Biology, Binzhou Medical University, YanTai, ShanDong, P.R.China
| | - Jingti Deng
- Department of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Ji'nan, P.R.China
| | - Chang Jun Lv
- The Affiliated Hospital to Binzhou Medical University, BinZhou, P.R.China
- * E-mail: (CL); (SX)
| | - Shu Yang Xie
- Key Laboratory of Tumour Molecular Biology in Binzhou Medical University, Department of Biochemistry and Molecular Biology, Binzhou Medical University, YanTai, ShanDong, P.R.China
- The Affiliated Hospital to Binzhou Medical University, BinZhou, P.R.China
- * E-mail: (CL); (SX)
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9
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Sato A, Xu Y, Whitsett JA, Ikegami M. CCAAT/enhancer binding protein-α regulates the protease/antiprotease balance required for bronchiolar epithelium regeneration. Am J Respir Cell Mol Biol 2012; 47:454-63. [PMID: 22652201 DOI: 10.1165/rcmb.2011-0239oc] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Many transcription factors that regulate lung morphogenesis during development are reactivated to mediate repairs of the injured adult lung. We hypothesized that CCAAT/enhancer binding protein-α (C/EBPα), a transcription factor critical for perinatal lung maturation, regulates genes required for the normal repair of the bronchiolar epithelium after injury. Transgenic Cebpα(Δ/Δ) mice, in which Cebpa was conditionally deleted from Clara cells and Type II cells after birth, were used in this study. Airway injury was induced in mice by the intraperitoneal administration of naphthalene to ablate bronchiolar epithelial cells. Although the deletion of C/EBPα did not influence lung structure and function under unstressed conditions, C/EBPα was required for the normal repair of terminal bronchiolar epithelium after naphthalene injury. To identify cellular processes that are influenced by C/EBPα during repair, mRNA microarray was performed on terminal bronchiolar epithelial cells isolated by laser-capture microdissection. Normal repair of the terminal bronchiolar epithelium was highly associated with the mRNAs regulating antiprotease activities, and their induction required C/EBPα. The defective deposition of fibronectin in Cebpα(Δ/Δ) mice was associated with increased protease activity and delayed differentiation of FoxJ1-expressing ciliated cells. The fibronectin and ciliated cells were restored by the intratracheal treatment of Cebpα(Δ/Δ) mice with the serine protease inhibitor. In conclusion, C/EBPα regulates the expression of serine protease inhibitors that are required for the normal increase of fibronectin and the restoration of ciliated cells after injury. Treatment with serine protease inhibitor may aid in the recovery of injured bronchiolar epithelial cells, and prevent common chronic lung diseases.
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Affiliation(s)
- Atsuyasu Sato
- Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229-3039, USA
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10
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Roos AB, Berg T, Barton JL, Didon L, Nord M. Airway epithelial cell differentiation during lung organogenesis requires C/EBPα and C/EBPβ. Dev Dyn 2012; 241:911-23. [PMID: 22411169 DOI: 10.1002/dvdy.23773] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/04/2012] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND CCAAT/enhancer-binding protein (C/EBP)α is crucial for lung development and differentiation of the pulmonary epithelium. Conversely, no lung defects have been observed in C/EBPβ-deficient mice, although C/EBPβ trans-activate pulmonary genes by binding to virtually identical DNA-sequences as C/EBPα. Thus, the pulmonary phenotype of mice lacking C/EBPβ could be explained by functional replacement with C/EBPα. We investigated whether C/EBPα and C/EBPβ have overlapping functions in regulating lung epithelial differentiation during organogenesis. Epithelial differentiation was assessed in mice with a lung epithelial-specific (SFTPC-Cre-mediated) deletion of C/EBPα (Cebpa(ΔLE) ), C/EBPβ (Cebpb(ΔLE) ), or both genes (Cebpa(ΔLE) ; Cebpb(ΔLE) ). RESULTS Both Cebpa(ΔLE) mice and Cebpa(ΔLE) ; Cebpb(ΔLE) mice demonstrated severe pulmonary immaturity compared to wild-type littermates, while no differences in lung histology or epithelial differentiation were observed in Cebpb(ΔLE) mice. In contrast to Cebpa(ΔLE) mice, Cebpa(ΔLE) ; Cebpb(ΔLE) mice also displayed undifferentiated Clara cells with markedly impaired protein and mRNA expression of Clara cell secretory protein (SCGB1A1), compared to wild-type littermates. In addition, ectopic mucus-producing cells were observed in the conducting airways of Cebpa(ΔLE) ; Cebpb(ΔLE) mice. CONCLUSIONS Our findings demonstrate that C/EBPα and C/EBPβ play pivotal, and partly overlapping roles in determining airway epithelial differentiation, with possible implications for tissue regeneration in lung homeostasis and disease.
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Affiliation(s)
- Abraham B Roos
- Department of Medicine, Respiratory Medicine Unit, Karolinska Institutet, Stockholm, Sweden.
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11
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Chang ST, Tchitchek N, Ghosh D, Benecke A, Katze MG. A chemokine gene expression signature derived from meta-analysis predicts the pathogenicity of viral respiratory infections. BMC SYSTEMS BIOLOGY 2011; 5:202. [PMID: 22189154 PMCID: PMC3297540 DOI: 10.1186/1752-0509-5-202] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Accepted: 12/22/2011] [Indexed: 12/21/2022]
Abstract
BACKGROUND During respiratory viral infections host injury occurs due in part to inappropriate host responses. In this study we sought to uncover the host transcriptional responses underlying differences between high- and low-pathogenic infections. RESULTS From a compendium of 12 studies that included responses to influenza A subtype H5N1, reconstructed 1918 influenza A virus, and SARS coronavirus, we used meta-analysis to derive multiple gene expression signatures. We compared these signatures by their capacity to segregate biological conditions by pathogenicity and predict pathogenicity in a test data set. The highest-performing signature was expressed as a continuum in low-, medium-, and high-pathogenicity samples, suggesting a direct, analog relationship between expression and pathogenicity. This signature comprised 57 genes including a subnetwork of chemokines, implicating dysregulated cell recruitment in injury. CONCLUSIONS Highly pathogenic viruses elicit expression of many of the same key genes as lower pathogenic viruses but to a higher degree. This increased degree of expression may result in the uncontrolled co-localization of inflammatory cell types and lead to irreversible host damage.
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Affiliation(s)
- Stewart T Chang
- Department of Microbiology, University of Washington, Seattle WA, USA
| | | | - Debashis Ghosh
- Department of Statistics, Pennsylvania State University, University Park PA, USA
| | - Arndt Benecke
- Institut des Hautes Etudes Scientifiques, Bures-sur-Yvette, France
| | - Michael G Katze
- Department of Microbiology, University of Washington, Seattle WA, USA
- Washington National Primate Research Center, Seattle WA, USA
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12
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Wong AP, Keating A, Waddell TK. Airway regeneration: the role of the Clara cell secretory protein and the cells that express it. Cytotherapy 2010; 11:676-87. [PMID: 19878054 DOI: 10.3109/14653240903313974] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Clara cell secretory protein (CCSP) is one of the most abundant proteins in the airway surface fluid, and has many putative functions. Recent advances in the field of stem cells and lung regeneration have identified potentially new roles of CCSP and CCSP-expressing cell populations in airway maintenance, repair and regeneration. This review focuses on the airway regenerative potential of CCSP and the cells that express this protein. The use of this protein or CCSP-expressing cells as an indication of biologic processes that contribute to lung injury or repair is highlighted.
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Affiliation(s)
- Amy P Wong
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, and the McEwen Centre for Regenerative Medicine, Toronto, Ontario, Canada
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13
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Didon L, Roos AB, Elmberger GP, Gonzalez FJ, Nord M. Lung-specific inactivation of CCAAT/enhancer binding protein alpha causes a pathological pattern characteristic of COPD. Eur Respir J 2009; 35:186-97. [PMID: 19608583 DOI: 10.1183/09031936.00185008] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The link between respiratory complications in prematurely born infants and susceptibility for developing chronic obstructive pulmonary disease (COPD) is receiving increasing attention. We have previously found that CCAAT/enhancer binding protein (C/EBP) activity in airway epithelial cells of COPD patients is decreased compared to healthy smokers, suggesting a previously unknown role for C/EBPs in COPD pathogenesis. To investigate the role of the transcription factor C/EBPalpha in lung development and its potential role in COPD, mice with a lung epithelial-specific disruption of the C/EBPalpha gene (Cebpa(DeltaLE)) were generated using Cre-mediated excision, and the resulting pathology was studied during development and into adulthood. Cebpa(DeltaLE) mice exhibit impaired lung development and epithelial differentiation, as well as affected vascularity. Furthermore, Cebpa(DeltaLE) mice that survive until adulthood develop a severe pathological picture with irregular emphysema; bronchiolitis, including goblet cell hyperplasia, bronchiolar metaplasia, fibrosis and mucus plugging; and an inflammatory cell and gene expression profile similar to COPD. Cebpa(DeltaLE) mice display lung immaturity during development, and adult Cebpa(DeltaLE) mice develop a majority of the histopathological and inflammatory characteristics of COPD. Cebpa(DeltaLE) mice could thus provide new valuable insights into understanding the long-term consequences of lung immaturity and the link to susceptibility of developing COPD.
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Affiliation(s)
- L Didon
- Dept of Medicine, Division for Respiratory Medicine, Karolinska Institute, Stockholm, Sweden.
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14
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Koschmieder S, Halmos B, Levantini E, Tenen DG. Dysregulation of the C/EBPalpha differentiation pathway in human cancer. J Clin Oncol 2009; 27:619-28. [PMID: 19075268 PMCID: PMC2645860 DOI: 10.1200/jco.2008.17.9812] [Citation(s) in RCA: 157] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Accepted: 10/10/2008] [Indexed: 11/20/2022] Open
Abstract
While much is known about aberrant pathways affecting cell growth and apoptosis, our understanding of another critical step of neoplastic transformation, differentiation arrest, remains poor. The differentiation-inducing transcription factor CCAAT enhancer binding protein alpha (C/EBPalpha) is required for proper control of adipogenesis, glucose metabolism, granulocytic differentiation, and lung development. Studies investigating the function of this protein in hematopoietic malignancies as well as in lung and skin cancer have revealed numerous ways how tumor cells abrogate C/EBPalpha function. Genetic and global expression analysis of acute myeloid leukemia (AML) cases identifies C/EBPalpha-deficient AML as a separate entity yielding novel classification schemes. In patients with a dysfunctional C/EBPalpha pathway, targeted therapies may overcome the block in differentiation, and in combination with conventional chemotherapy, may lead to complete eradication of the malignant clone. Overall, a better understanding of the mechanisms of how C/EBPalpha dysregulation participates in the neoplastic process has opened new gateways for differentiation biology research.
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Affiliation(s)
- Steffen Koschmieder
- From the University of Münster, Münster, Germany; Case Western Reserve University, Cleveland, OH; Cancer Science Institute of Singapore, Singapore; and Harvard Stem Cell Institute, Harvard Medical School, Boston, MA
| | - Balazs Halmos
- From the University of Münster, Münster, Germany; Case Western Reserve University, Cleveland, OH; Cancer Science Institute of Singapore, Singapore; and Harvard Stem Cell Institute, Harvard Medical School, Boston, MA
| | - Elena Levantini
- From the University of Münster, Münster, Germany; Case Western Reserve University, Cleveland, OH; Cancer Science Institute of Singapore, Singapore; and Harvard Stem Cell Institute, Harvard Medical School, Boston, MA
| | - Daniel G. Tenen
- From the University of Münster, Münster, Germany; Case Western Reserve University, Cleveland, OH; Cancer Science Institute of Singapore, Singapore; and Harvard Stem Cell Institute, Harvard Medical School, Boston, MA
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15
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Liu Z, Lu X, Zhang XH, Bochner BS, Long XB, Zhang F, Wang H, Cui YH. Clara cell 10-kDa protein expression in chronic rhinosinusitis and its cytokine-driven regulation in sinonasal mucosa. Allergy 2009; 64:149-57. [PMID: 19076932 DOI: 10.1111/j.1398-9995.2008.01847.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Clara cell 10-kDa protein (CC10) is a multifunction protein with anti-inflammatory and immunomodulatory effects; hence we compared the CC10 expression between chronic rhinosinusitis (CRS) patients with and without nasal polyps (NPs), analyzed its association with disease severity and response to surgery, and explored its regulation via cytokines. METHODS The plasma and tissue CC10 levels were compared between controls and CRS patients with and without NPs by means of quantitative RT-PCR, ELISA, and immunohistochemistry. Computed tomography (CT) scan and endoscopy findings and symptoms were scored. Nasal explant culture was used to explore the effect of TNF-alpha, IL-1beta, IL-4, INF-gamma, and IL-10 on CC10 gene regulation. RESULTS Compared with controls, the CC10 expression in sinonasal mucosa was significantly inhibited in both CRS patients with and without NPs. There was a significant further decrease of CC10 expression in patients with NPs and asthma. No difference in CC10 plasma levels was found between controls and patients. CC10 levels inversely correlated with preoperative CT scores, and postoperative endoscopy and symptom scores. TNF-alpha, IL-1beta and IL-4 inhibited, whereas INF-gamma and IL-10 promoted CC10 production in nasal mucosa. A significantly faster decay of CC10 transcripts was seen after IL-1beta treatment. IL-1beta and IL-10 induced thyroid transcription factor-1 expression. INF-gamma increased, whereas IL-4 inhibited hepatocyte nuclear factor-3alpha expression. CONCLUSION CC10 may take part in the pathogenesis of CRS and correlates with disease severity and response to surgery. Different cytokines can regulate CC10 expression in nasal mucosa differentially through modulating mRNA stability and certain transcriptional factors expression.
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Affiliation(s)
- Z Liu
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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16
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Nishio T, Bando H, Bamba H, Hisa Y, Okamura H. Circadian gene expression in the murine larynx. Auris Nasus Larynx 2008; 35:539-44. [PMID: 18346860 DOI: 10.1016/j.anl.2007.12.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2007] [Revised: 12/21/2007] [Accepted: 12/27/2007] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Symptoms of airway diseases are often associated with specific times of the day. For example, midnight worsening of cough is a frequent complaint of patients with laryngitis and bronchitis. We speculate that these symptoms are under the control of the circadian clock, and the clock genes in the airway epithelium play some important roles. In the present study, we tried to prove the time specific expressions of clock oscillating genes in the murine larynx. MATERIALS AND METHODS Adult wild-type C57/Bl6 mice and mCry1(-/-)mCry2(-/-) mutant mice were used for this study. We employed immunohistochemistry and/or Northern blotting for examining the circadian expression of mPer1, mPer2, C/EBPbeta, HNF3beta, and MUC5b. RESULTS The expression of mPer2 mRNA showed a strong day-night expression difference, which was abolished after the lesion of the suprachiasmatic nucleus, and in mCry1(-/-)mCry2(-/-) mutant mice. mPER1 and mPER2 proteins both showed very similar expression profiles in the epithelium and submucosal glands with a peak in the evening and a trough in the early morning. Other nuclear proteins such as C/EBPbeta and HNF3beta did not show the rhythms. MUC5b protein showed circadian oscillation in the laryngeal submucosal gland. CONCLUSION In this study, we confirmed the existence of a local laryngeal clock which is controlled by the central clock in the suprachiasmatic nucleus. MUC5b protein in the submucosal mucous gland also showed circadian rhythm. We consider that these rhythmic expressions may cause the time specific symptoms among laryngeal diseases.
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Affiliation(s)
- Takeshi Nishio
- Department of Otolaryngology-Head and Neck Surgery, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyo-ku, Kyoto 602-8566, Japan.
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17
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Crepaldi L, Lackner C, Corti C, Ferraguti F. Transcriptional activators and repressors for the neuron-specific expression of a metabotropic glutamate receptor. J Biol Chem 2007; 282:17877-89. [PMID: 17430891 DOI: 10.1074/jbc.m700149200] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Metabotropic glutamate receptor 1 (mGlu1) has a discrete distribution in the central nervous system restricted to neurons. Its expression undergoes important changes during development and in response to physiological and pathological modifications. Here, we have determined the structure of the mGlu1 gene and demonstrated that mGlu1 transcription takes places at alternative first exons. Moreover, we have identified active promoter regions upstream from the two most expressed first exons by means of luciferase reporter gene assays performed in primary cerebellar granule neurons. Targeted mutations of active elements constituting the core promoter and electrophoretic mobility shift assays demonstrated that the factors thyroid transcription factor-1 and CCAAT/enhancer-binding proteins beta act synergistically to promote mGlu1 transcription. We have also elucidated the molecular bases for the neuron-specific expression of mGlu1 identifying a neural restrictive silencing element and a regulatory factor for X box element, which suppressed mGlu1 expression in nonneuronal cells. These results reveal the molecular bases for cell- and context-specific expression of an important glutamate receptor critically involved in synaptogenesis, neuronal differentiation, synaptic transmission, and plasticity.
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Affiliation(s)
- Luca Crepaldi
- Department of Pharmacology, Innsbruck Medical University, Peter-Mayr-Strasse 1a, A-6020 Innsbruck, Austria
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18
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Abstract
The vertebrate lung consists of multiple cell types that are derived primarily from endodermal and mesodermal compartments of the early embryo. The process of pulmonary organogenesis requires the generation of precise signaling centers that are linked to transcriptional programs that, in turn, regulate cell numbers, differentiation, and behavior, as branching morphogenesis and alveolarization proceed. This review summarizes knowledge regarding the expression and proposed roles of transcription factors influencing lung formation and function with particular focus on knowledge derived from the study of the mouse. A group of transcription factors active in the endodermally derived cells of the developing lung tubules, including thyroid transcription factor-1 (TTF-1), beta-catenin, Forkhead orthologs (FOX), GATA, SOX, and ETS family members are required for normal lung morphogenesis and function. In contrast, a group of distinct proteins, including FOXF1, POD1, GLI, and HOX family members, play important roles in the developing lung mesenchyme, from which pulmonary vessels and bronchial smooth muscle develop. Lung formation is dependent on reciprocal signaling among cells of both endodermal and mesenchymal compartments that instruct transcriptional processes mediating lung formation and adaptation to breathing after birth.
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Affiliation(s)
- Yutaka Maeda
- Division of Pulmonary Biology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center and The University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
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19
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Costa DB, Li S, Kocher O, Feins RH, Keller SM, Schiller JH, Johnson DH, Tenen DG, Halmos B. Immunohistochemical analysis of C/EBPalpha in non-small cell lung cancer reveals frequent down-regulation in stage II and IIIA tumors: a correlative study of E3590. Lung Cancer 2007; 56:97-103. [PMID: 17239984 PMCID: PMC3380244 DOI: 10.1016/j.lungcan.2006.11.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2006] [Revised: 10/30/2006] [Accepted: 11/27/2006] [Indexed: 11/20/2022]
Abstract
PURPOSE We sought to determine the association of C/EBPalpha expression status with clinical, pathologic and molecular characteristics, as well as outcomes, in non-small-cell lung cancer (NSCLC). This is the first comprehensive study of this transcription factor in patients with NSCLC. PATIENTS AND METHODS Our cohort originated from ECOG 3590 (randomized trial of postoperative adjuvant therapy with thoracic radiation or cisplatin and etoposide plus thoracic radiation in patients with completely resected stages II and IIIA NSCLC; and its laboratory correlate, ECOG 4592). One hundred and sixty four tumor samples contained sufficient material for immunohistochemical (IHC) analysis. C/EBPalpha tumor staining was compared to that of basal bronchial cells (3+). 0 or 1+ (weak) suggested lack of, while 2 or 3+ (strong) suggested C/EBPalpha expression. RESULTS Ninety tumors (55%) had 0 or 1+ C/EBPalpha staining, and the remaining 74 (45%) 2 or 3+. Patients with squamous cell carcinomas had a higher percentage of weak C/EBPalpha IHC staining compared to other histologies (p=0.048) and there was a trend for loss of C/EBPalpha in poorly differentiated compared to well differentiated tumors (p=0.07). There was no association between C/EBPalpha IHC and mutations in p53 or K-ras. The median disease-free survival for patients with weak and strong C/EBPalpha IHC expression was 29.6 and 30.6 months, respectively (p=0.94). The median overall survival between the weak and strong groups was 43.5 and 38.5 months, respectively (p=0.83). CONCLUSIONS Loss of expression of C/EBPalpha is seen in over half of stage II and IIIA NSCLC, specifically in squamous cell carcinomas and poorly differentiated tumors. Since down-regulation of C/EBPalpha is a common event in NSCLC, further elucidation of the involvement of C/EBPalpha in the pathogenesis and progression of lung cancer may identify novel therapeutic targets.
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Affiliation(s)
- Daniel B. Costa
- Division of Hematology/Oncology, Harvard Medical School, Boston, MA
| | - Sigui Li
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA
| | - Olivier Kocher
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
| | | | | | | | | | - Daniel G. Tenen
- Division of Hematology/Oncology, Harvard Medical School, Boston, MA
- Corresponding author:, Daniel G. Tenen, MD, Harvard Institutes of Medicine, HIM-954, 77 Louis Pasteur Ave., Boston, MA 02215, , telephone: (617) 667-5561, fax: (617) 667-3299
| | - Balazs Halmos
- Division of Hematology/Oncology, Case Western Reserve University, Cleveland, OH
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20
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Minoo P, Hu L, Xing Y, Zhu NL, Chen H, Li M, Borok Z, Li C. Physical and functional interactions between homeodomain NKX2.1 and winged helix/forkhead FOXA1 in lung epithelial cells. Mol Cell Biol 2007; 27:2155-65. [PMID: 17220277 PMCID: PMC1820505 DOI: 10.1128/mcb.01133-06] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
NKX2.1 is a homeodomain transcription factor that controls development of the brain, lung, and thyroid. In the lung, Nkx2.1 is expressed in a proximo-distal gradient and activates specific genes in phenotypically distinct epithelial cells located along this axis. The mechanisms by which NKX2.1 controls its target genes may involve interactions with other transcription factors. We examined whether NKX2.1 interacts with members of the winged-helix/forkhead family of FOXA transcription factors to regulate two spatially and cell type-specific genes, SpC and Ccsp. The results show that NKX2.1 interacts physically and functionally with FOXA1. The nature of the interaction is inhibitory and occurs through the NKX2.1 homeodomain in a DNA-independent manner. On SpC, which lacks a FOXA1 binding site, FOXA1 attenuates NKX2.1-dependent transcription. Inhibition of FOXA1 by small interfering RNA increased SpC mRNA, demonstrating the in vivo relevance of this finding. In contrast, FOXA1 and NKX2.1 additively activate transcription from Ccsp, which includes both NKX2.1 and FOXA1 binding sites. In electrophoretic mobility shift assays, the GST-FOXA1 fusion protein interferes with the formation of NKX2.1 transcriptional complexes by potentially masking the latter's homeodomain DNA binding function. These findings suggest a novel mode of selective gene regulation by proximo-distal gradient distribution of and functional interactions between forkhead and homeodomain transcription factors.
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Affiliation(s)
- Parviz Minoo
- Department of Pediatrics, University of Southern California Keck School of Medicine, Los Angeles, CA 90033, USA.
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21
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Yatabe Y. Molecular classification of tumors with special reference to EGFR mutation in lung cancer. Cancer Chemother Pharmacol 2006. [DOI: 10.1007/s00280-006-0311-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Hesselbrock DR, Kurpios N, Hassell JA, Watson MA, Fleming TP. PEA3, AP-1, and a unique repetitive sequence all are involved in transcriptional regulation of the breast cancer-associated gene, mammaglobin. Breast Cancer Res Treat 2005; 89:289-96. [PMID: 15754128 DOI: 10.1007/s10549-004-2622-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The breast cancer-associated gene mammaglobin is a member of the secretoglobin protein family and has demonstrated its utility as a breast cancer marker. However, the transcriptional regulation of mammaglobin has not been well-characterized. In this report, we used luciferase reporter assays to identify the 200 bp directly 5' of the transcriptional start site as the minimal promoter region of mammaglobin. Sequence scanning indicated that two PEA3 transcription sites were possibly involved in mammaglobin transcription. By transfecting a PEA3 expression vector into breast cancer cell lines MDA-MB-415 and MCF-7, we determined that exogenous PEA3 was able to drive transcription. Mutational analysis indicated that each PEA3 site was functional. Our reporter system and electrophorectic mobility shift assays (EMSAs) also identified the involvement of a unique repetitive element in mammaglobin transcription. Finally, AP-1 was determined via luciferase assays to be involved in regulating non-PEA3 dependent transcription. Elucidating these cis-acting elements will impact our understanding of transcription of normal breast and breast cancer-associated genes.
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Affiliation(s)
- Diane R Hesselbrock
- Department of Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA
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23
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Yatabe Y, Kosaka T, Takahashi T, Mitsudomi T. EGFR Mutation Is Specific for Terminal Respiratory Unit Type Adenocarcinoma. Am J Surg Pathol 2005; 29:633-9. [PMID: 15832087 DOI: 10.1097/01.pas.0000157935.28066.35] [Citation(s) in RCA: 184] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We have previously reported that terminal-respiratory-unit (TRU) type adenocarcinoma is a distinct subset of lung adenocarcinoma in terms of molecular pathway for carcinogenesis and phenotypic profiles. This type of cancer shows TRU features, characterized by distinct cellular morphology and the expression of TTF-1 and surfactant proteins. Recently, two groups published novel mutations of the epidermal growth factor receptor (EGFR) that are closely associated with clinical response to gefitinib. The clinicopathologic features of gefitinib responders overlap with those of TRU-type adenocarcinoma, and the characteristics of TRU are likely to correspond to the bronchioloalveolar features reported as a predictor of gefitinib response. We therefore examined the characteristics of EGFR-mutated pulmonary adenocarcinomas with special reference to TRU-type adenocarcinoma. EGFR mutation was detected in 97 of 195 adenocarcinomas, 91 of 149 TRU-type adenocarcinomas and 6 of 46 tumors of other types. Conversely, 91 of 97 EGFR-mutated adenocarcinomas were categorized as TRU-type adenocarcinomas. This type-specific involvement was confirmed by logistic regression model. In addition, EGFR mutation was detected in some cases of atypical adenomatous hyperplasia, a preinvasive lesion of TRU-type adenocarcinoma. These findings further confirm that TRU-type-adenocarcinoma is a distinct adenocarcinoma subset in which a particular molecular pathway is involved.
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Affiliation(s)
- Yasushi Yatabe
- Department of Pathology and Molecular Diagnostics, Aichi Cancer Center Hospital, Nagoya, Japan.
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24
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Halmos B, Bassères DS, Monti S, D'Aló F, Dayaram T, Ferenczi K, Wouters BJ, Huettner CS, Golub TR, Tenen DG. A Transcriptional Profiling Study of CCAAT/Enhancer Binding Protein Targets Identifies Hepatocyte Nuclear Factor 3β as a Novel Tumor Suppressor in Lung Cancer. Cancer Res 2004; 64:4137-47. [PMID: 15205324 DOI: 10.1158/0008-5472.can-03-4052] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We showed previously that CCAAT/enhancer binding protein alpha (C/EBP alpha), a tissue-specific transcription factor, is a candidate tumor suppressor in lung cancer. In the present study, we have performed a transcriptional profiling study of C/EBP alpha target genes using an inducible cell line system. This study led to the identification of hepatocyte nuclear factor 3beta (HNF3 beta), a transcription factor known to play a role in airway differentiation, as a downstream target of C/EBP alpha. We found down-regulation of HNF3 beta expression in a large proportion of lung cancer cell lines examined and identified two novel mutants of HNF3 beta, as well as hypermethylation of the HNF3 beta promoter. We also developed a tetracycline-inducible cell line model to study the cellular consequences of HNF3 beta expression. Conditional expression of HNF3 beta led to significant growth reduction, proliferation arrest, apoptosis, and loss of clonogenic ability, suggesting additionally that HNF3 beta is a novel tumor suppressor in lung cancer. This is the first study to show genetic abnormalities of lung-specific differentiation pathways in the development of lung cancer.
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Affiliation(s)
- Balazs Halmos
- Division of Hematology/Oncology, Beth Israel Deaconess Medical Center, Boston, USA
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25
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Cassel TN, Nord M. C/EBP transcription factors in the lung epithelium. Am J Physiol Lung Cell Mol Physiol 2003; 285:L773-81. [PMID: 12959923 DOI: 10.1152/ajplung.00023.2003] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
During recent years, the biological roles of CCAAT/enhancer binding proteins (C/EBPs) in the lung have started to be uncovered. C/EBPs form a family within the basic region-leucine zipper class of transcription factors. In the lung epithelium C/EBPalpha, -beta, and -delta are expressed. Lung-specific target genes for these transcription factors include the surfactant proteins A and D, the Clara cell secretory protein, and the P450 enzyme CYP2B1. As more information is gathered, a picture is emerging in which C/EBPalpha has a role in regulating proliferation as well as differentiation-dependent gene expression, whereas C/EBPbeta and -delta, in addition to a partly overlapping role in regulating expression of differentiation markers, also seem to be involved in responses to injury and hormones.
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Affiliation(s)
- Tobias N Cassel
- Dept. of Medical Nutrition, Karolinska Institutet, Novum, Huddinge Univ. Hospital, SE 141 86 Huddinge, Sweden
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26
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Ramsay PL, Luo Z, Major A, Park MS, Finegold M, Welty SE, Kwak I, Darlington G, Demayo FJ. Multiple mechanisms for oxygen-induced regulation of the Clara cell secretory protein gene. FASEB J 2003; 17:2142-4. [PMID: 14500549 DOI: 10.1096/fj.03-0048fje] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The Clara cell secretory protein (CCSP) imparts a protective effect to the lung during oxidant injury. However, exposure to supplemental oxygen, a common therapeutic modality for lung disease, represses the expression of CCSP in the adult mouse lung. We investigated the mechanisms of hyperoxia-induced repression of the mouse CCSP promoter. Deletion experiments in vivo and in vitro indicated that the hyperoxia-responsive elements are localized to the proximal -166 bp of the CCSP promoter. Electrophoretic mobility shift and supershift analyses demonstrated increased binding of c-Jun at the activator protein-1 site, increased binding of CCAAT/enhancer binding protein (C/EBP) beta at the C/EBP sites, and decreased binding at the Nkx2.1 sites. Western analyses revealed that hyperoxia exposure induced an increase in the expression of the C/EBPbeta isoform liver-inhibiting protein (LIP) and an increase in cytoplasmic Nkx2.1. Cotransfection of LIP or c-Jun expression plasmids decreased the transcriptional activity of the proximal -166-bp CCSP promoter. These observations suggest that hyperoxia-induced repression of the CCSP gene is mediated, at least in part, at the level of transcription and that multiple mechanisms mediate this repression. Moreover, these novel observations may provide insights for generation of therapeutic interventions for the amelioration of oxidant-induced lung injury.
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Affiliation(s)
- P L Ramsay
- Department of Pediatrics, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA
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27
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Abstract
Jaagsiekte sheep retrovirus (JSRV) is the causative agent of ovine pulmonary adenocarcinoma (OPA), a contagious lung cancer of sheep. Until recently, research on JSRV/OPA was hampered by the lack of a tissue culture system for the propagation of the virus. Historically, pathological samples (lung fluid) collected from sheep affected by OPA were the only source of infectious JSRV. Thus studies on the JSRV/OPA system were conducted only where field isolates of OPA cases were readily available. In the past 10 years, the deduction of the JSRV sequence (York et al. 1991; York 1992), the isolation of an infectious and oncogenic JSRV molecular clone (JSRV21) (Palmarini et al. 1999a) and the establishment of a rapid method to produce infectious virus in vitro (Palmarini et al. 1999a) sparked many studies at the molecular level that strengthened past observations and revealed new properties of this unique virus. Here, we will review the data accumulated so far on the molecular biology of JSRV using the infectious and oncogenic JSRV21 molecular clone as virus of reference.
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Affiliation(s)
- M Palmarini
- Department of Medical Microbiology and Parasitology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602-7386, USA.
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28
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Ramsay PL, Luo Z, Magdaleno SM, Whitbourne SK, Cao X, Park MS, Welty SE, Yu-Lee LY, DeMayo FJ. Transcriptional regulation of CCSP by interferon-gamma in vitro and in vivo. Am J Physiol Lung Cell Mol Physiol 2003; 284:L108-18. [PMID: 12388333 DOI: 10.1152/ajplung.00186.2002] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Interferon gamma (IFN-gamma), a potent cytokine inducing a wide range of immunologic activities, is increased in the airway secondary to viral infection or during an inflammatory response. This increase in IFN-gamma concentration may alter the expression of specific airway epithelial cell genes that regulate adaptation of airway inflammatory responses. One protein induced by IFN-gamma is Clara cell secretory protein (CCSP), which may contribute to the attenuation of airway inflammation. This study was done to investigate the molecular mechanism by which IFN-gamma stimulates the expression of the CCSP gene in mouse transformed Clara cells and transgenic mice. Deletion mapping and linker-scanning mutations demonstrated that IFN-gamma-induced expression of CCSP was regulated, in part, at the level of transcription. In vitro and in vivo studies verified that the minimal IFN-gamma-responsive segment was localized to the proximal 166 bp of the 5'-flanking region. Additionally, IFN-gamma-induced expression of CCSP was mediated indirectly through an interferon regulatory factor-1-mediated increase in hepatocyte nuclear factor-3beta.
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Affiliation(s)
- P L Ramsay
- Department of Pediatrics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
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29
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Cassel TN, Berg T, Suske G, Nord M. Synergistic transactivation of the differentiation-dependent lung gene Clara cell secretory protein (secretoglobin 1a1) by the basic region leucine zipper factor CCAAT/enhancer-binding protein alpha and the homeodomain factor Nkx2.1/thyroid transcription factor-1. J Biol Chem 2002; 277:36970-7. [PMID: 12161423 DOI: 10.1074/jbc.m201293200] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The basic region-leucine zipper transcription factor CCAAT/enhancer-binding protein alpha (C/EBPalpha) and the homeodomain transcription factor Nkx2.1/thyroid transcription factor-1 are essential for normal lung morphogenesis. Nkx2.1 is expressed from the onset of lung development, whereas C/EBPalpha expression is turned on at later stages. The expression of C/EBPalpha correlates to the appearance of lung-specific proteins with differentiation-dependent expression patterns, such as the Clara cell secretory protein (secretoglobin 1a1 (Scgb1a1), CCSP). In this study, we demonstrate synergistic transactivation by C/EBPalpha and Nkx2.1 in the regulation of the CCSP gene. We show that the synergistic activity of C/EBPalpha and Nkx2.1 originates from cis-acting elements in the proximal promoter of CCSP and that the synergism is dependent on NH(2)-terminal transactivation domains of C/EBPalpha and Nkx2.1. Our results suggest that the cooperation of C/EBPalpha and Nkx2.1 is a major determinant for the high level, lung epithelial-specific expression of CCSP during the later stages of lung development and in the adult lung.
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Affiliation(s)
- Tobias N Cassel
- Department of Medical Nutrition, Karolinska Institutet, Novum, SE-141 86 Huddinge, Sweden
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30
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Liu W, Enwright JF, Hyun W, Day RN, Schaufele F. CCAAT/enhancer binding protein alpha uses distinct domains to prolong pituitary cells in the growth 1 and DNA synthesis phases of the cell cycle. BMC Cell Biol 2002; 3:6. [PMID: 11914124 PMCID: PMC101385 DOI: 10.1186/1471-2121-3-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2001] [Accepted: 03/21/2002] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND A number of transcription factors coordinate differentiation by simultaneously regulating gene expression and cell proliferation. CCAAT/enhancer binding protein alpha (C/EBPalpha) is a basic/leucine zipper transcription factor that integrates transcription with proliferation to regulate the differentiation of tissues involved in energy balance. In the pituitary, C/EBPalpha regulates the transcription of a key metabolic regulator, growth hormone. RESULTS We examined the consequences of C/EBPalpha expression on proliferation of the transformed, mouse GHFT1-5 pituitary progenitor cell line. In contrast to mature pituitary cells, GHFT1-5 cells do not contain C/EBPalpha. Ectopic expression of C/EBPalpha in the progenitor cells resulted in prolongation of both growth 1 (G1) and the DNA synthesis (S) phases of the cell cycle. Transcription activation domain 1 and 2 of C/EBPalpha were required for prolongation of G1, but not of S. Some transcriptionally inactive derivatives of C/EBPalpha remained competent for G1 and S phase prolongation. C/EBPalpha deleted of its leucine zipper dimerization functions was as effective as full-length C/EBPalpha in prolonging G1 and S. CONCLUSION We found that C/EBPalpha utilizes mechanistically distinct activities to prolong the cell cycle in G1 and S in pituitary progenitor cells. G1 and S phase prolongation did not require that C/EBPalpha remained transcriptionally active or retained the ability to dimerize via the leucine zipper. G1, but not S, arrest required a domain overlapping with C/EBPalpha transcription activation functions 1 and 2. Separation of mechanisms governing proliferation and transcription permits C/EBPalpha to regulate gene expression independently of its effects on proliferation.
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Affiliation(s)
- Weiqun Liu
- Metabolic Research Unit, Diabetes Research Center and Department of Medicine, University of California, San Francisco, CA, 94143-0540, USA
- Elan Pharmaceuticals, 800 Gateway Boulevard, South San Francisco, CA, 94080, USA
| | - John F Enwright
- Departments of Medicine and Cell Biology, NSF Center for Biological Timing, University of Virginia Health Sciences Center, Charlottesville, Virginia, 22908, USA
- Department of Biology, Austin College, Sherman, TX, 75090, USA
| | - William Hyun
- Comprehensive Cancer Center, University of California, San Francisco, CA, 94143, USA
| | - Richard N Day
- Departments of Medicine and Cell Biology, NSF Center for Biological Timing, University of Virginia Health Sciences Center, Charlottesville, Virginia, 22908, USA
| | - Fred Schaufele
- Metabolic Research Unit, Diabetes Research Center and Department of Medicine, University of California, San Francisco, CA, 94143-0540, USA
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31
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McGee-Estrada K, Palmarini M, Fan H. HNF-3beta is a critical factor for the expression of the Jaagsiekte sheep retrovirus long terminal repeat in type II pneumocytes but not in Clara cells. Virology 2002; 292:87-97. [PMID: 11878911 DOI: 10.1006/viro.2001.1247] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Jaagsiekte sheep retrovirus (JSRV) is the causative agent of ovine pulmonary adenocarcinoma (OPA), a sheep lung cancer that resembles human lung adenocarcinoma or bronchioloaveolar carcinoma (BAC). JSRV is the only retrovirus that shows lung tropism and induces pulmonary carcinoma. Several lines of evidence suggest that the lung tropism for JSRV is mainly determined by the viral long terminal repeats (LTR). In a previous study, we showed that HNF-3alpha and -3beta were able to transactivate the JSRV LTR when cotransfected into 3T3 cells. The JSRV LTR contains two putative HNF-3 binding sites; to investigate the contribution of each HNF-3 binding site to transcription, we generated reporter constructs with deletions or nucleotide substitutions in one or both of the putative HNF-3 binding sites. In murine MLE-15 cells (derived from type II pneumocytes), mutations within the upstream site (minus sign147 to minus sign128 bp) resulted in a 72% reduction of the LTR activity, while mutation of the downstream site had little effect. In contrast, transactivation of the JSRV LTR was greatly reduced in 3T3 cells cotransfected with an HNF-3alpha or -3beta expression plasmid when the downstream site was eliminated. Electrophoretic mobility shift assays (EMSA) revealed that nuclear extracts from MLE-15 cells, but not 3T3 cells, were able to form a retarded complex with oligonucleotides encompassing either the upstream or the downstream sites. Anti-HNF-3beta antiserum, but not anti-HNF-3alpha antiserum, supershifted both protein-DNA complexes. These results indicate that the JSRV LTR is activated by the lung-specific transcription factor HNF-3beta and that the upstream HNF-3 binding site is essential for expression in MLE-15 cells. In contrast, transactivation by HNF-3beta in 3T3 cells is mediated through the downstream HNF-3 site. On the other hand, JSRV LTR expression in a mouse lung Clara cell-derived line (mtCC1-2) did not appear to be strongly dependent on either HNF-3 binding site. These results support the notion that JSRV lung tropism is determined by the transcriptional specificity of the JSRV LTR, which is governed by interactions with lung-specific transcription factors.
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Affiliation(s)
- Kathleen McGee-Estrada
- Department of Molecular Biology and Biochemistry and Cancer Research Institute, University of California Irvine, Irvine, California 92697, USA
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