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Cao J, Zhang D, Li W, Yuan W, Luo G, Xie S. Azilsartan improves urinary albumin excretion in hypertension mice. Aging (Albany NY) 2024; 16:4138-4148. [PMID: 38462692 DOI: 10.18632/aging.205271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 05/31/2023] [Indexed: 03/12/2024]
Abstract
Hypertension is one of the most important risk factors for chronic kidney diseases, leading to hypertensive nephrosclerosis, including excessive albuminuria. Azilsartan, an angiotensin II type 1 receptor blocker, has been widely used for the treatment of hypertension. However, the effects of Azilsartan on urinary albumin excretion in hypertension haven't been reported before. In this study, we investigated whether Azilsartan possesses a beneficial property against albuminuria in mice treated with angiotensin II and a high-salt diet (ANG/HS). Compared to the control group, the ANG/HS group had higher blood pressure, oxidative stress, and inflammatory response, all of which were rescued by Azilsartan dose-dependently. Importantly, the ANG/HS-induced increase in urinary albumin excretion and decrease in the expression of occludin were reversed by Azilsartan. Additionally, it was shown that increased fluorescence intensity of FITC-dextran, declined trans-endothelial electrical resistance (TEER) values, and reduction of occludin and krüppel-like factor 2 (KLF2) were observed in ANG/HS-treated human renal glomerular endothelial cells (HrGECs), then prevented by Azilsartan. Moreover, the regulatory effect of Azilsartan on endothelial monolayer permeability in ANG/HS-treated HrGECs was abolished by the knockdown of KLF2, indicating KLF2 is required for the effect of Azilsartan. We concluded that Azilsartan alleviated diabetic nephropathy-induced increase in Uterine artery embolization (UAE) mediated by the KLF2/occludin axis.
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Affiliation(s)
- Jun Cao
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Dandan Zhang
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Wenfeng Li
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Wenjin Yuan
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Gang Luo
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Shaofeng Xie
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
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Wu H, Chen S, You G, Lei B, Chen L, Wu J, Zheng N, You C. The Mechanism of Astragaloside IV in NOD-like Receptor Family Pyrin Domain Containing 3 Inflammasome-mediated Pyroptosis after Intracerebral Hemorrhage. Curr Neurovasc Res 2024; 21:CNR-EPUB-138701. [PMID: 38409729 DOI: 10.2174/0115672026295640240212095049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 01/01/1970] [Accepted: 01/29/2024] [Indexed: 02/28/2024]
Abstract
BACKGROUND Intracerebral hemorrhage (ICH) is one of the most common subtypes of stroke. OBJECTIVES This study aimed to investigate the mechanism of Astragaloside IV (AS-IV) on inflammatory injury after ICH. METHODS The ICH model was established by the injection of collagenase and treated with ASIV (20 mg/kg or 40 mg/kg). The neurological function, water content of the bilateral cerebral hemisphere and cerebellum, and pathological changes in brain tissue were assessed. The levels of interleukin-1 beta (IL-1β), IL-18, tumor necrosis factor-alpha, interferon-gamma, and IL-10 were detected by enzyme-linked immunosorbent assay. The levels of Kruppel-like factor 2 (KLF2), NOD-like receptor family pyrin domain containing 3 (NLRP3), GSDMD-N, and cleaved-caspase-1 were detected by reverse transcription-quantitative polymerase chain reaction and Western blot assay. The binding relationship between KLF2 and NLRP3 was verified by chromatin-immunoprecipitation and dual-luciferase assays. KLF2 inhibition or NLRP3 overexpression was achieved in mice to observe pathological changes. RESULTS The decreased neurological function, increased water content, severe pathological damage, and inflammatory response were observed in mice after ICH, with increased levels of NLRP3/GSDMD-N/cleaved-caspase-1/IL-1β/IL-18 and poorly-expressed KLF2 in brain tissue. After AS-IV treatment, the neurological dysfunction, high brain water content, inflammatory response, and pyroptosis were alleviated, while KLF2 expression was increased. KLF2 bonded to the NLRP3 promoter region and inhibited its transcription. Down-regulation of KLF2 or upregulation of NLRP3 reversed the effect of AS-IV on inhibiting pyroptosis and reducing inflammatory injury in mice after ICH. CONCLUSION AS-IV inhibited NLRP3-mediated pyroptosis by promoting KLF2 expression and alleviated inflammatory injury in mice after ICH.
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Affiliation(s)
- Honggang Wu
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, China
- Department of Cerebrovascular Disease, The People's Hospital of Leshan, Leshan, 614000, China
| | - Shu Chen
- Department of Cerebrovascular Disease, The People's Hospital of Leshan, Leshan, 614000, China
| | - Guoliang You
- Department of Cerebrovascular Disease, The People's Hospital of Leshan, Leshan, 614000, China
| | - Bo Lei
- Department of Cerebrovascular Disease, The People's Hospital of Leshan, Leshan, 614000, China
| | - Li Chen
- Department of Cerebrovascular Disease, The People's Hospital of Leshan, Leshan, 614000, China
| | - Jiachuan Wu
- Department of Cerebrovascular Disease, The People's Hospital of Leshan, Leshan, 614000, China
| | - Niandong Zheng
- Department of Cerebrovascular Disease, The People's Hospital of Leshan, Leshan, 614000, China
| | - Chao You
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, 610041, China
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Chen Q, Rong H, Zhang L, Wang Y, Bian Q, Zheng J. KLF2 Orchestrates Pathological Progression of Infantile Hemangioma through Hemangioma Stem Cell Fate Decisions. J Invest Dermatol 2024:S0022-202X(24)00113-1. [PMID: 38382868 DOI: 10.1016/j.jid.2024.01.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 01/29/2024] [Accepted: 01/30/2024] [Indexed: 02/23/2024]
Abstract
Infantile hemangioma (IH) is the most prevalent vascular tumor during infancy, characterized by a rapid proliferation phase of disorganized blood vessels and spontaneous involution. IH possibily arises from a special type of multipotent stem cells called hemangioma stem cells (HemSCs), which could differentiate into endothelial cells, pericytes, and adipocytes. However, the underlying mechanisms that regulate the cell fate determination of HemSCs remain elusive. Here, we unveil KLF2 as a candidate transcription factor involved in the control of HemSCs differentiation. KLF2 exhibits high expression in endothelial cells in proliferating IH but diminishes in adipocytes in involuting IH. Using a combination of in vitro culture of patient-derived HemSCs and HemSCs implantation mouse models, we show that KLF2 governs the proliferation, apoptosis and cell cycle progression of HemSCs. Importantly, KLF2 acts as a crucial determinant of HemSCs' fate, directing their differentiation toward endothelial cells while inhibiting adipogenesis. Knockdown of KLF2 induces a pro-adipogenic transcriptome in HemSCs, leading to impaired blood vessel formation and accelerated adipocyte differentiation. Collectively, our findings highlight KLF2 as a critical regulator controlling the progression and involution of IH by modulating HemSCs' cell fate decisions.
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Affiliation(s)
- Qiming Chen
- Department of Oromaxillofacial Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, 200011, China
| | - Hao Rong
- Shanghai Institute of Precision Medicine, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200125, China
| | - Ling Zhang
- Department of Oromaxillofacial Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, 200011, China
| | - Yanan Wang
- Department of Oromaxillofacial Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, 200011, China
| | - Qian Bian
- Shanghai Institute of Precision Medicine, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200125, China.
| | - Jiawei Zheng
- Department of Oromaxillofacial Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, 200011, China.
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Wang J, Zhang Y, Ma Y, Zhao S, Wang J, Chen H, Zhang J, Liu J. TET1 inhibits liver fibrosis by blocking hepatic stellate cell activation. J Gastroenterol Hepatol 2024. [PMID: 38369780 DOI: 10.1111/jgh.16443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 02/20/2024]
Abstract
Hepatic stellate cells (HSCs) are critical regulator contributing to the onset and progression of liver fibrosis. Chronic liver injury triggers HSCs to undergo vast changes and trans-differentiation into a myofibroblast HSCs, the mechanism remains to be elucidated. This study investigated that the involvement of hydroxymethylase TET1 (ten-eleven translocation 1) in HSC activation and liver fibrosis. It is revealed that TET1 levels were downregulated in the livers in mouse models of liver fibrosis and patients with cirrhosis, as well as activated HSCs in comparison to quiescent HSCs. In vitro data showed that the inhibition of TET1 promoted the activation HSC, whereas TET1 overexpression inhibited HSC activation. Moreover, TET1 could regulate KLF2 (Kruppel-like transcription factors) transcription by promoting hydroxymethylation of its promoter, which in turn suppressed the activation of HSCs. In vivo, it is confirmed that liver fibrosis was aggravated in Tet1 knockout mice after CCl4 injection, accompanied by excessive activation of primary stellate cells, in contrast to wild-type mice. In conclusion, we suggested that TET1 plays a significant role in HSC activation and liver fibrosis, which provides a promising target for anti-fibrotic therapies.
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Affiliation(s)
- Jingjie Wang
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai, China
| | - Yitong Zhang
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai, China
| | - Yanyun Ma
- State Key Laboratory of Genetic Engineering, Human Phenome Institute, Fudan University, Shanghai, China
- Department of Anthropology and Human Genetics, School of Life Sciences, Fudan University, Shanghai, China
- Six-sector Industrial Research Institute, Fudan University, Shanghai, China
| | - Suhan Zhao
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai, China
| | - Jiucun Wang
- State Key Laboratory of Genetic Engineering, Human Phenome Institute, Fudan University, Shanghai, China
- Department of Anthropology and Human Genetics, School of Life Sciences, Fudan University, Shanghai, China
| | - Hongtan Chen
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Jun Zhang
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai, China
| | - Jie Liu
- Department of Digestive Diseases, Huashan Hospital, Fudan University, Shanghai, China
- State Key Laboratory of Genetic Engineering, Human Phenome Institute, Fudan University, Shanghai, China
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Chou WC, Chen WT, Kuo CT, Chang YM, Lu YS, Li CW, Hung MC, Shen CY. Genetic insights into carbohydrate sulfotransferase 8 and its impact on the immunotherapy efficacy of cancer. Cell Rep 2024; 43:113641. [PMID: 38165805 DOI: 10.1016/j.celrep.2023.113641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 11/12/2023] [Accepted: 12/18/2023] [Indexed: 01/04/2024] Open
Abstract
Immune checkpoint blockade (ICB) is a promising therapy for solid tumors, but its effectiveness depends on biomarkers that are not precise. Here, we utilized genome-wide association study to investigate the association between genetic variants and tumor mutation burden to interpret ICB response. We identified 16 variants (p < 5 × 10-8) probed to 17 genes on 9 chromosomes. Subsequent analysis of one of the most significant loci in 19q13.11 suggested that the rs111308825 locus at the enhancer is causal, as its A allele impairs KLF2 binding, leading to lower carbohydrate sulfotransferase 8 (CHST8) expression. Breast cancer cells expressing CHST8 suppress T cell activation, and Chst8 loss attenuates tumor growth in a syngeneic mouse model. Further investigation revealed that programmed death-ligand 1 (PD-L1) and its homologs could be sulfated by CHST8, resulting in M2-like macrophage enrichment in the tumor microenvironment. Finally, we confirmed that low-CHST8 tumors have better ICB response, supporting the genetic effect and clinical value of rs111308825 for ICB efficacy prediction.
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Affiliation(s)
- Wen-Cheng Chou
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.
| | - Wei-Ting Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Chun-Tse Kuo
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Yao-Ming Chang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Yen-Shen Lu
- Department of Oncology, National Taiwan University Hospital, Taipei, Taiwan
| | - Chia-Wei Li
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Mien-Chie Hung
- Graduate Institute of Biomedical Sciences, Center for Molecular Medicine, China Medical University, Taichung, Taiwan
| | - Chen-Yang Shen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan; College of Public Health, China Medical University, Taichung, Taiwan.
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Li Y, Liu C, Chen Z, Lin H, Li X. Netrin-1 protects blood-brain barrier (BBB) integrity after cerebral ischemia-reperfusion by activating the Kruppel-like factor 2 ( KLF2)/occludin pathway. J Biochem Mol Toxicol 2024; 38:e23623. [PMID: 38229322 DOI: 10.1002/jbt.23623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 11/04/2023] [Accepted: 12/14/2023] [Indexed: 01/18/2024]
Abstract
Ischemia/reperfusion (I/R)-induced neural damage and neuroinflammation have been associated with pathological progression during stroke. Netrin-1 is an important member of the family of laminin-related secreted proteins, which plays an important role in governing axon elongation. However, it is unknown whether Netrin-1 possesses a beneficial role in stroke. Here, we employed the middle cerebral artery occlusion (MCAO) model to study the function of Netrin-1 in alleviating brain injuries. Our results demonstrate that Netrin-1 rescued poststroke neurological deficits and inhibited production of the inflammatory cytokines such as interleukin 6 (IL-6) and endothelial chemokine (C-X-C motif) ligand 1 (Cxcl1). Importantly, Netrin-1 protected against MCAO-induced dysfunction of the blood-brain barrier (BBB) in mice and a reduction in the expression of the tight junction (TJ) protein occludin. Additionally, we report that Netrin-1 could ameliorate oxygen-glucose deprivation/reoxygenation (OGD/R)-induced injury and prevent aggravation in endothelial monolayer permeability in bEnd.3 human brain microvascular endothelial cells (HBMVECs). Mechanistically, Netrin-1 ameliorated OGD/R-induced decrease in occludin and Kruppel-like factor 2 (KLF2) in HBMVECs. Notably, silencing of KLF2 abolished the beneficial effects of Netrin-1 in protecting endothelial permeability and occludin expression, suggesting that these effects are mediated by KLF2. In conclusion, our findings suggest that Netrin-1 could constitute a novel therapeutic strategy for ischemic stroke.
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Affiliation(s)
- Yuanxiao Li
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, Fujian Province, China
| | - Changyun Liu
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, Fujian Province, China
| | - Zhiting Chen
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, Fujian Province, China
| | - Hanbin Lin
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, Fujian Province, China
| | - Xiaofeng Li
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, Fujian Province, China
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Huang Y, Wang YF, Ruan XZ, Lau CW, Wang L, Huang Y. The role of KLF2 in regulating hepatic lipogenesis and blood cholesterol homeostasis via the SCAP/SREBP pathway. J Lipid Res 2024; 65:100472. [PMID: 37949368 PMCID: PMC10805670 DOI: 10.1016/j.jlr.2023.100472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 10/21/2023] [Accepted: 11/02/2023] [Indexed: 11/12/2023] Open
Abstract
Liver steatosis is a common metabolic disorder resulting from imbalanced lipid metabolism, which involves various processes such as de novo lipogenesis, fatty acid uptake, fatty acid oxidation, and VLDL secretion. In this study, we discovered that KLF2, a transcription factor, plays a crucial role in regulating lipid metabolism in the liver. Overexpression of KLF2 in the liver of db/db mice, C57BL/6J mice, and Cd36-/- mice fed on a normal diet resulted in increased lipid content in the liver. Additionally, transgenic mice (ALB-Klf2) that overexpressed Klf2 in the liver developed liver steatosis after being fed a normal diet. We found that KLF2 promotes lipogenesis by increasing the expression of SCAP, a chaperone that facilitates the activation of SREBP, the master transcription factor for lipogenic gene expression. Our mechanism studies revealed that KLF2 enhances lipogenesis in the liver by binding to the promoter of SCAP and increasing the expression of genes involved in fatty acid synthesis. Reduction of KLF2 expression led to a decrease in SCAP expression and a reduction in the expression of SREBP1 target genes involved in lipogenesis. Overexpression of KLF2 also increased the activation of SREBP2 and the mRNA levels of its downstream target SOAT1. In C57BL/6J mice fed a high-fat diet, overexpression of Klf2 increased blood VLDL secretion, while reducing its expression decreased blood cholesterol levels. Our study emphasizes the novelty that hepatic KLF2 plays a critical role in regulating lipid metabolism through the KLF2/SCAP/SREBPs pathway, which is essential for hepatic lipogenesis and maintaining blood cholesterol homeostasis.
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Affiliation(s)
- Yuhong Huang
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China; School of Biomedical Sciences, Chinese University of Hong Kong, Hong Kong, PR China; Shenzhen Research Institute and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Shenzhen, China
| | - Yi Fan Wang
- School of Biomedical Sciences, Chinese University of Hong Kong, Hong Kong, PR China
| | - Xiong Zhong Ruan
- Centre for Lipid Research & Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, Department of Infectious Diseases, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Chi Wai Lau
- School of Biomedical Sciences, Chinese University of Hong Kong, Hong Kong, PR China
| | - Li Wang
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China
| | - Yu Huang
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China.
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Ma Y, Peng T, Yao X, Sun C, Wang X. KLF2 reduces dexamethasone-induced injury to growth plate chondrocytes by inhibiting the Runx2-mediated PI3K/AKT and ERK signalling pathways. Autoimmunity 2023; 56:1-7. [PMID: 36343159 DOI: 10.1080/08916934.2022.2141233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Dexamethasone (Dex) is a type of glucocorticoid drug. Long term use can induce growth plate chondrocytes (GPCs) apoptosis, impair differentiation, and inhibit cell proliferation and bone growth. It has been reported that Krüppel-like factor 2 (KLF2) inhibits osteoblast damage induced by Dex, but the role in Dex-induced GPCs remains unclear. Dex was used to construct a model of growth plate injury in vitro. CCK-8 and TUNEL kits were used to determine cell viability and apoptosis. A model of growth plate injury was established by intraperitoneal injection of Dex. Immunohistochemistry was used to investigate the expression of KLF2 in rats. The results showed that KLF2 expression of rat tibial GPCs was down-regulated after Dex stimulation. Overexpression of KLF2 promoted cell viability and cell cycle, while inhibited apoptosis of growth plate Dex-induced chondrocytes. Moreover, KLF2 inhibited Runx2-mediated PI3K/AKT and ERK signalling pathways. And PI3K/AKT and ERK signalling pathways, which were involved in the regulation of KLF2 on GPCs. Further studies showed that KLF2 alleviated growth plate injury in vivo. In conclusion, our study found that KLF2 promoted proliferation and inhibited apoptosis of Dex-induced GPCs by targeting the Runx2-mediated PI3K/AKT and ERK signalling pathways.
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Affiliation(s)
- Yulong Ma
- Department of Orthopedics, Xi'an Children's Hospital, Xi'an, Shaanxi, China
| | - Tao Peng
- Department of Orthopedics, Xi'an Children's Hospital, Xi'an, Shaanxi, China
| | - Xudong Yao
- Department of Orthopedics, Xi'an Children's Hospital, Xi'an, Shaanxi, China
| | - Chaonan Sun
- Department of Orthopedics, Xi'an Children's Hospital, Xi'an, Shaanxi, China
| | - Xiaowei Wang
- Department of Orthopedics, Xi'an Children's Hospital, Xi'an, Shaanxi, China
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Cheng X, Shen C, Liao Z. KLF2 transcription suppresses endometrial cancer cell proliferation, invasion, and migration through the inhibition of NPM1. J OBSTET GYNAECOL 2023; 43:2238827. [PMID: 37610103 DOI: 10.1080/01443615.2023.2238827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 07/16/2023] [Indexed: 08/24/2023]
Abstract
Endometrial cancer (EC) is the most common gynaecologic malignancy. This study was to explore the role of kruppel-like factor 2 (KLF2) in EC cell behaviours. The expression of KLF2 in EC and its correlation with NPM1 were first predicted on the database. Levels of KLF2 and nucleophosmin 1 (NPM1) in EC cell lines were then determined. After transfection of the overexpression vector of KLF2 or NPM1, cell proliferation, invasion, and migration were evaluated. The binding relationship between KLF2 and the NPM1 promoter was analysed. KLF2 was downregulated while NPM1 was upregulated in EC cells. KLF2 overexpression reduced the proliferation potential of EC cells and the number of invaded and migrated cells. KLF2 was enriched in the NPM1 promoter and inhibited NPM1 transcriptional level. NPM1 overexpression neutralised the effects of KLF2 overexpression on suppressing EC cell growth. Collectively, KLF2 was decreased in EC cells and KLF2 overexpression increased the binding to the NPM1 promoter to inhibit NPM1 transcription, thus suppressing EC cell growth.
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Affiliation(s)
- Xiyun Cheng
- Department of Obstetrics and Gynecology, Department of Gynecomatology, Ganzhou Cancer Hospital, Ganzhou, P.R. China
| | - Changmei Shen
- Department of Obstetrics and Gynecology, Department of Gynecomatology, Ganzhou Cancer Hospital, Ganzhou, P.R. China
| | - Zhenrong Liao
- Department of Obstetrics and Gynecology, Department of Gynecomatology, Ganzhou Cancer Hospital, Ganzhou, P.R. China
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Prateeksha P, Naidu P, Das M, Barthels D, Das H. KLF2 Regulates Neural Differentiation of Dental Pulp-derived Stem Cells by Modulating Autophagy and Mitophagy. Stem Cell Rev Rep 2023; 19:2886-2900. [PMID: 37642902 DOI: 10.1007/s12015-023-10607-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2023] [Indexed: 08/31/2023]
Abstract
BACKGROUND Transplantation of stem cells for treating neurodegenerative disorders is a promising future therapeutic approach. However, the molecular mechanism underlying the neuronal differentiation of dental pulp-derived stem cells (DPSC) remains inadequately explored. The current study aims to define the regulatory role of KLF2 (Kruppel-like factor 2) during the neural differentiation (ND) of DPSC. METHODS We first investigated the transcriptional and translational expression of KLF2, autophagy, and mitophagy-associated markers during the ND of DPSC by using quantitative RT-PCR and western blot methods. After that, we applied the chemical-mediated loss- and gain-of-function approaches using KLF2 inhibitor, GGPP (geranylgeranyl pyrophosphate), and KLF2 activator, GGTI-298 (geranylgeranyl transferase inhibitor-298) to delineate the role of KLF2 during ND of DPSC. The western blot, qRT-PCR, and immunocytochemistry were performed to determine the molecular changes during ND after KLF2 deficiency and KLF2 sufficiency. We also analyzed the oxygen consumption rate (OCR) and the extracellular acidification rate (ECAR) using the Seahorse XFe24 analyzer. RESULTS Our study demonstrated that the expression level of KLF2, autophagy, and mitophagy-associated markers were significantly elevated during the ND of DPSC. Next, we found that the KLF2 inhibitor, GGPP significantly reduced the ND of DPSC. Inversely, KLF2 overexpression accelerated the molecular phenomenon of DPSC's commitment towards ND, indicating the crucial role of KLF2 in neurogenesis. Moreover, we found that the KLF2 positively regulated autophagy, mitophagy, and the Wnt5a signaling pathway during neurogenesis. Seahorse XFe24 analysis revealed that the ECAR and OCR parameters were significantly increased during ND, and inhibition of KLF2 marginally reversed them towards DPSC's cellular bioenergetics. However, KLF2 overexpression shifted the cellular energy metabolism toward the quiescent stage. CONCLUSION Collectively, our findings provide the first evidence that the KLF2 critically regulates the neurogenesis of DPSC by inducing autophagy and mitophagy.
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Affiliation(s)
- Prateeksha Prateeksha
- Department of Pharmaceutical Sciences, Jerry H. Hodge School of Pharmacy, Texas Tech University Health Sciences Center, ARB Suite 2116, 1406 South Coulter Street, Amarillo, TX, 79106, USA
| | - Prathyusha Naidu
- Department of Pharmaceutical Sciences, Jerry H. Hodge School of Pharmacy, Texas Tech University Health Sciences Center, ARB Suite 2116, 1406 South Coulter Street, Amarillo, TX, 79106, USA
| | - Manjusri Das
- Department of Pharmaceutical Sciences, Jerry H. Hodge School of Pharmacy, Texas Tech University Health Sciences Center, ARB Suite 2116, 1406 South Coulter Street, Amarillo, TX, 79106, USA
| | - Derek Barthels
- Department of Pharmaceutical Sciences, Jerry H. Hodge School of Pharmacy, Texas Tech University Health Sciences Center, ARB Suite 2116, 1406 South Coulter Street, Amarillo, TX, 79106, USA
| | - Hiranmoy Das
- Department of Pharmaceutical Sciences, Jerry H. Hodge School of Pharmacy, Texas Tech University Health Sciences Center, ARB Suite 2116, 1406 South Coulter Street, Amarillo, TX, 79106, USA.
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Gong Z, Shu Z, Zhou Y, Chen Y, Zhu H. KLF2 regulates stemness of human mesenchymal stem cells by targeting FGFR3. Biotech Histochem 2023; 98:447-455. [PMID: 37381732 DOI: 10.1080/10520295.2023.2225225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/30/2023] Open
Abstract
Mesenchymal stem cells (MSCs) are an attractive source of pluripotent cells for regenerative therapy; however, maintaining stemness and self-renewal of MSCs during expansion ex vivo is challenging. For future clinical applications, it is essential to define the roles and signaling pathways that regulate the fate of MSCs. Based on our earlier finding that Krüppel-like factor 2 (KLF2) participates in maintaining stemness in MSCs, we examined further the role of this factor in intrinsic signaling pathways. Using a chromatin immunoprecipitation (ChIP)-sequence assay, we found that the FGFR3 gene is a KLF2 binding site. Knockdown of FGFR3 significantly decreased the levels of key pluripotency factors, enhanced the expression of differentiation-related genes and down-regulated colony formation of human bone marrow MSCs (hBMSCs). Using alizarin red S and oil red O staining, we found that knockdown of FGFR3 inhibited the osteogenic and adipogenic ability of MSCs under conditions of differentiation. The ChIP-qPCR assay confirmed that KLF2 interacts with the promoter regions of FGFR3. Our findings suggest that KLF2 promotes hBMSC stemness by direct regulation of FGFR. Our findings may contribute to enhanced MSC stemness by genetic modification of stemness-related genes.
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Affiliation(s)
- Zhiyuan Gong
- Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
| | - Zhanhao Shu
- Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
| | - Ying Zhou
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou, China
| | - Yin Chen
- Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
| | - Huiyong Zhu
- Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
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12
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Taghehchian N, Maharati A, Akhlaghipour I, Zangouei AS, Moghbeli M. PRC2 mediated KLF2 down regulation: a therapeutic and diagnostic axis during tumor progression. Cancer Cell Int 2023; 23:233. [PMID: 37807067 PMCID: PMC10561470 DOI: 10.1186/s12935-023-03086-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 09/29/2023] [Indexed: 10/10/2023] Open
Abstract
Surgery and chemo-radiotherapy are used as the common first-line treatment options in many cancers. However, tumor relapse is observed in many cancer patients following such first-line treatments. Therefore, targeted therapy according to the molecular cancer biology can be very important in reducing tumor recurrence. In this regard, a wide range of monoclonal antibodies against the growth factors and their receptors can offer more targeted treatment in cancer patients. However, due to the importance of growth factors in the normal biology of body cells, side effects can also be observed following the application of growth factor inhibitors. Therefore, more specific factors should be introduced as therapeutic targets with less side effects. Krüppel-like factors 2 (KLF2) belongs to the KLF family of transcription factors that are involved in the regulation of many cellular processes. KLF2 deregulations have been also reported during the progression of many tumors. In the present review we discussed the molecular mechanisms of KLF2 during tumor growth and invasion. It has been shown that the KLF2 as a tumor suppressor is mainly inhibited by the non-coding RNAs (ncRNAs) through the polycomb repressive complex 2 (PRC2) recruitment. This review is an effective step towards introducing the KLF2 as a suitable diagnostic and therapeutic target in cancer patients.
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Affiliation(s)
- Negin Taghehchian
- Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amirhosein Maharati
- Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Student Research Committee, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Iman Akhlaghipour
- Student Research Committee, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amir Sadra Zangouei
- Student Research Committee, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Meysam Moghbeli
- Department of Medical Genetics and Molecular Medicine, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
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13
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Huang S, Zhao J, Yu H, Chen G. Mechanism of tumor-derived extracellular vesicles in prostatic cancer progression through the circFMN2/ KLF2/RNF128 axis. Apoptosis 2023; 28:1372-1389. [PMID: 37452271 DOI: 10.1007/s10495-023-01872-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2023] [Indexed: 07/18/2023]
Abstract
Circular RNAs (circRNAs) are a major type of cargos encapsulated in extracellular vesicles (EVs) and regulate the progression of prostatic cancer (PC). This study was conducted to explore the role of tumor-derived EVs in PC cell proliferation, invasion, and migration via shuttle of circRNA formin 2 (circFMN2). RT-qPCR or Western blot assay showed that circFMN2 was upregulated while KLF2 and RNF128 were downregulated in PC tissues and cells. EVs were separated from PC cells and characterized and its internalization in PC cells was examined, which suggested that PC-EVs mediated the shuttle of circFMN2 to upregulate circFMN2 expression in PC cells. PC cell functions were determined by cell counting kit-8, colony formation and Transwell assays, which suggested that PC-EVs fueled the proliferation, invasion, and migration of PC cells. At cellular level, PC-EVs mediated the shuttle of circFMN2 to upregulate circFMN2 expression in PC cells, and circFMN2 binding to HuR decreased the HuR-KLF2 interaction and repressed KLF2 expression, which further reduced the KLF2-RNF128 promoter binding and repressed RNF128 transcription. Overexpression of KLF2/RNF128 ablated the effects of PC-EVs on the proliferation, invasion, and migration of PC cells. The xenograft tumor models and lung/liver metastasis models were established and revealed that PC-EVs accelerated tumorigenesis and metastasis in vivo via delivery of circFMN2 and repression of KLF2/RNF128.
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Affiliation(s)
- Shuang Huang
- Department of Urology, The Third Medical Center of PLA General Hospital, No. 69 Yongding Road, Haidian District, Beijing, 100039, China
| | - Jianming Zhao
- Department of Urology, The Third Medical Center of PLA General Hospital, No. 69 Yongding Road, Haidian District, Beijing, 100039, China
| | - Hongkai Yu
- Department of Urology, The Third Medical Center of PLA General Hospital, No. 69 Yongding Road, Haidian District, Beijing, 100039, China
| | - Guangfu Chen
- Department of Urology, The Third Medical Center of PLA General Hospital, No. 69 Yongding Road, Haidian District, Beijing, 100039, China.
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14
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Li J, Jiang JL, Chen YM, Lu WQ. KLF2 inhibits colorectal cancer progression and metastasis by inducing ferroptosis via the PI3K/AKT signaling pathway. J Pathol Clin Res 2023; 9:423-435. [PMID: 37147883 PMCID: PMC10397377 DOI: 10.1002/cjp2.325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 03/26/2023] [Accepted: 04/16/2023] [Indexed: 05/07/2023]
Abstract
Krüppel-like factor 2 (KLF2) belongs to the zinc finger family and is thought to be a tumor suppressor gene due to its low expression in various cancer types. However, its functional role and molecular pathway involvement in colorectal cancer (CRC) are not well defined. Herein, we investigated the potential mechanism of KLF2 in CRC cell invasion, migration, and epithelial-mesenchymal transition (EMT). We utilized the TCGA and GEPIA databases to analyze the expression of KLF2 in CRC patients and its correlation with different CRC stages and CRC prognosis. RT-PCR, western blot, and immunohistochemistry assays were used to measure KLF2 expression. Gain-of-function assays were performed to evaluate the role of KLF2 in CRC progression. Moreover, mechanistic experiments were conducted to investigate the molecular mechanism and involved signaling pathways regulated by KLF2. Additionally, we also conducted a xenograft tumor assay to evaluate the role of KLF2 in tumorigenesis. KLF2 expression was low in CRC patient tissues and cell lines, and low expression of KLF2 was associated with poor CRC prognosis. Remarkably, overexpressing KLF2 significantly inhibited the invasion, migration, and EMT capabilities of CRC cells, and tumor growth in xenografts. Mechanistically, KLF2 overexpression induced ferroptosis in CRC cells by regulating glutathione peroxidase 4 expression. Moreover, this KLF2-dependent ferroptosis in CRC cells was mediated by inhibiting the PI3K/AKT signaling pathway that resulted in the suppression of invasion, migration, and EMT of CRC cells. We report for the first time that KLF2 acts as a tumor suppressor in CRC by inducing ferroptosis via inhibiting the PI3K/AKT signaling pathway, thus providing a new direction for CRC prognosis assessment and targeted therapy.
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Affiliation(s)
- Jia Li
- Department of General SurgeryShenzhen Traditional Chinese Medicine HospitalShenzhenPR China
| | - Ji Ling Jiang
- Department of General SurgeryShenzhen Traditional Chinese Medicine HospitalShenzhenPR China
| | - Yi Mei Chen
- Department of Breast SurgeryShenzhen Women & Children's Health Care HospitalShenzhenPR China
| | - Wei Qi Lu
- Department of Gastrointestinal SurgeryFirst Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhouPR China
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15
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Ye Y, Xu J, Han Y. Dexamethasone for delayed edema after intracerebral hemorrhage: To be or not to be? Heliyon 2023; 9:e17621. [PMID: 37539239 PMCID: PMC10395021 DOI: 10.1016/j.heliyon.2023.e17621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/22/2023] [Accepted: 06/22/2023] [Indexed: 08/05/2023] Open
Abstract
The pathogenesis of delayed cerebral edema after intracerebral hemorrhage is still unclear. In this case report, we speculate that the formation of subdural effusion or hemorrhage is associated with delayed cerebral edema. By referring to the treatment plan of chronic subdural hematoma, adding dexamethasone to routine medication, certain therapeutic effect has been achieved. Dexamethasone may maintain the stability of blood-brain barrier by directly increasing the expression of ZO-1, and reduce the neuroinflammatory response caused by NF-κB pathway by upregulating KLF2 expression, ultimately reducing nerve injury through multiple pathways.
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Affiliation(s)
- Yongqing Ye
- Department of Neurosurgery, The Affiliated Suqian First People’s Hospital of Nanjing Medical University, Jiangsu Province, Suqian 223800, China
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Heilongjiang Province, Harbin 150000, China
| | - Jin Xu
- Department of Neurosurgery, The Affiliated Suqian First People’s Hospital of Nanjing Medical University, Jiangsu Province, Suqian 223800, China
| | - Yuhan Han
- Department of Neurosurgery, The Affiliated Suqian First People’s Hospital of Nanjing Medical University, Jiangsu Province, Suqian 223800, China
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Chen XQ, Ma J, Xu D, Xiang ZL. Comprehensive analysis of KLF2 as a prognostic biomarker associated with fibrosis and immune infiltration in advanced hepatocellular carcinoma. BMC Bioinformatics 2023; 24:270. [PMID: 37386390 PMCID: PMC10308631 DOI: 10.1186/s12859-023-05391-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 06/17/2023] [Indexed: 07/01/2023] Open
Abstract
PURPOSE Most Hepatocellular carcinoma (HCC) patients are in advanced or metastatic stage at the time of diagnosis. Prognosis for advanced HCC patients is dismal. This study was based on our previous microarray results, and aimed to explore the promising diagnostic and prognostic markers for advanced HCC by focusing on the important function of KLF2. METHODS The Cancer Genome Atlas (TCGA), Cancer Genome Consortium database (ICGC), and the Gene Expression Comprehensive Database (GEO) provided the raw data of this study research. The cBioPortal platform, CeDR Atlas platform, and the Human Protein Atlas (HPA) website were applied to analyze the mutational landscape and single-cell sequencing data of KLF2. Basing on the results of single-cell sequencing analyses, we further explored the molecular mechanism of KLF2 regulation in the fibrosis and immune infiltration of HCC. RESULTS Decreased KLF2 expression was discovered to be mainly regulated by hypermethylation, and indicated a poor prognosis of HCC. Single-cell level expression analyses revealed KLF2 was highly expressed in immune cells and fibroblasts. The function enrichment analysis of KLF2 targets indicated the crucial association between KLF2 and tumor matrix. 33-genes related with cancer associated fibroblasts (CAFs) were collected to identify the significant association of KLF2 with fibrosis. And SPP1 was validated as a promising prognostic and diagnostic marker for advanced HCC patients. CXCR6 CD8+ T cells were noted as a predominant proportion in the immune microenvironment, and T cell receptor CD3D was discovered to be a potential therapeutic biomarker for HCC immunotherapy. CONCLUSION This study identified that KLF2 is an important factor promoting HCC progression by affecting the fibrosis and immune infiltration, highlighting its great potential as a novel prognostic biomarker for advanced HCC.
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Affiliation(s)
- Xue-Qin Chen
- Department of Radiation Oncology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, 200120, China
| | - Jie Ma
- Department of Radiation Oncology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, 200120, China
| | - Di Xu
- Department of Radiation Oncology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, 200120, China
| | - Zuo-Lin Xiang
- Department of Radiation Oncology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, 200120, China.
- Department of Radiation Oncology, Shanghai East Hospital Ji'an hospital, Jiangxi, 343000, China.
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Qiu D, Xu K, Chung N, Robbins J, Luo R, Lawrence M, He A, Yu F, Alt A, Miller MM, Hangeland J, Feder JN, Seiffert D, Arey BJ. Identification and validation of G protein-coupled receptors modulating flow-dependent signaling pathways in vascular endothelial cells. Front Mol Biosci 2023; 10:1198079. [PMID: 37363403 PMCID: PMC10285409 DOI: 10.3389/fmolb.2023.1198079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 05/22/2023] [Indexed: 06/28/2023] Open
Abstract
Vascular endothelial cells are exposed to mechanical forces due to their presence at the interface between the vessel wall and flowing blood. The patterns of these mechanical forces (laminar vs. turbulent) regulate endothelial cell function and play an important role in determining endothelial phenotype and ultimately cardiovascular health. One of the key transcriptional mediators of the positive effects of laminar flow patterns on endothelial cell phenotype is the zinc-finger transcription factor, krüppel-like factor 2 (KLF2). Given its importance in maintaining a healthy endothelium, we sought to identify endothelial regulators of the KLF2 transcriptional program as potential new therapeutic approaches to treating cardiovascular disease. Using an approach that utilized both bioinformatics and targeted gene knockdown, we identified endothelial GPCRs capable of modulating KLF2 expression. Genetic screening using siRNAs directed to these GPCRs identified 12 potential GPCR targets that could modulate the KLF2 program, including a subset capable of regulating flow-induced KLF2 expression in primary endothelial cells. Among these targets, we describe the ability of several GPCRs (GPR116, SSTR3, GPR101, LGR4) to affect KLF2 transcriptional activation. We also identify these targets as potential validated targets for the development of novel treatments targeting the endothelium. Finally, we highlight the initiation of drug discovery efforts for LGR4 and report the identification of the first known synthetic ligands to this receptor as a proof-of-concept for pathway-directed phenotypic screening to identify novel drug targets.
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18
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Wittner J, Schuh W. Krüppel-like factor 2: a central regulator of B cell differentiation and plasma cell homing. Front Immunol 2023; 14:1172641. [PMID: 37251374 PMCID: PMC10213221 DOI: 10.3389/fimmu.2023.1172641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 04/06/2023] [Indexed: 05/31/2023] Open
Abstract
The development of B cells, their activation and terminal differentiation into antibody-producing plasma cells are characterized by alternating phases of proliferation and quiescence that are controlled by complex transcriptional networks. The spatial and anatomical organization of B cells and plasma cells inside lymphoid organs as well as their migration within lymphoid structures and between organs are prerequisites for the generation and the maintenance of humoral immune responses. Transcription factors of the Krüppel-like family are critical regulators of immune cell differentiation, activation, and migration. Here, we discuss the functional relevance of Krüppel-like factor 2 (KLF2) for B cell development, B cell activation, plasma cell formation and maintenance. We elaborate on KLF2-mediated regulation of B cell and plasmablast migration in the context of immune responses. Moreover, we describe the importance of KLF2 for the onset and the progression of B cell-related diseases and malignancies.
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Gao J, Hu J, Yu F, Wang C, Sheng D, Liu W, Hu A, Yu K, Xiao X, Kuang Y, Zacksenhaus E, Gajendran B, Ben-David Y. Lovastatin inhibits erythroleukemia progression through KLF2-mediated suppression of MAPK/ERK signaling. BMC Cancer 2023; 23:306. [PMID: 37016335 PMCID: PMC10071686 DOI: 10.1186/s12885-023-10742-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 03/15/2023] [Indexed: 04/06/2023] Open
Abstract
BACKGROUND Lovastatin, an HMG-CoA inhibitor and an effective cholesterol lowering drug, exhibits anti-neoplastic activity towards several types of cancer, although the underlying mechanism is still not fully understood. Herein, we investigated mechanism of growth inhibition of leukemic cells by lovastatin. METHODS RNAseq analysis was used to explore the effect of lovastatin on gene expression in leukemic cells. An animal model of leukemia was used to test the effect of this statin in vivo. FAM83A and DDIT4 expression was knocked-downed in leukemia cells via lentivirus-shRNA. Western blotting, RT-qPCR, cell cycle analysis and apoptosis assays were used to determine the effect of lovastatin-induced growth suppression in leukemic cells in vitro. RESULTS Lovastatin treatment strongly inhibited cancer progression in a mouse model of erythroleukemia induced by Friend virus. In tissue culture, lovastatin inhibited cell proliferation through induction of G1 phase cell cycle arrest and apoptosis. Interestingly, lovastatin induced most known genes associated with cholesterol biosynthesis in leukemic cells. Moreover, it suppressed ERK1/2 phosphorylation by downregulating FAM83A and DDIT4, two mediators of MAP-Kinase signaling. RNAseq analysis of lovastatin treated leukemic cells revealed a strong induction of the tumor suppressor gene KLF2. Accordingly, lentivirus-mediated knockdown of KLF2 antagonized leukemia cell suppression induced by lovastatin, associated with higher ERK1/2 phosphorylation compared to control. We further show that KLF2 induction by lovastatin is responsible for lower expression of the FAM83A and DDIT4 oncogenes, involved in the activation of ERK1/2. KLF2 activation by lovastatin also activated a subset of cholesterol biosynthesis genes that may further contribute to leukemia suppression. CONCLUSIONS These results implicate KLF2-mediated FAM83A/DDIT4/MAPK suppression and activation of cholesterol biosynthesis as the mechanism of leukemia cell growth inhibition by lovastatin.
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Affiliation(s)
- Jian Gao
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Jifen Hu
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Fang Yu
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Chunlin Wang
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Danmei Sheng
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Wuling Liu
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Anling Hu
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Kunling Yu
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Xiao Xiao
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Yi Kuang
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China
| | - Eldad Zacksenhaus
- Department of Medicine, University of Toronto, Toronto, ON, Canada
- Division of Advanced Diagnostics, Toronto General Research Institute, University Health Network, Toronto, ON, Canada
| | - Babu Gajendran
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China.
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China.
- School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang, Guizhou Province, 550025, People's Republic of China.
| | - Yaacov Ben-David
- State Key Laboratory for Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, People's Republic of China.
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese, Academic of Sciences, Guiyang, Guizhou, People's Republic of China.
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Zou L, Fang Y, He W. TRAF7 inhibits glycolysis to potentiate growth inhibition and apoptosis of myeloid leukemia cells via regulating the KLF2-PFKFB3 axis. Mol Cell Probes 2023; 69:101911. [PMID: 37003349 DOI: 10.1016/j.mcp.2023.101911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 03/27/2023] [Accepted: 03/27/2023] [Indexed: 04/03/2023]
Abstract
Tumor necrosis factor receptor-related factor 7 (TRAF7) can regulate cell differentiation and apoptosis, but its specific functional mechanism in the pathological process of acute myeloid leukemia (AML) closely related to differentiation and apoptosis disorders is largely unclear. In this study, TRAF7 was found to be lowly expressed in AML patients and a variety of myeloid leukemia cells. TRAF7 was overexpressed in AML Molm-13 and chronic myeloid leukemia (CML) K562 cells by transfection with pcDNA3.1-TRAF7. CCK-8 assay and flow cytometry analysis showed that TRAF7 overexpression induced growth inhibition and apoptosis in K562 and Molm-13 cells. Measurements of glucose and lactate suggested that TRAF7 overexpression impaired glycolysis of K562 and Molm-13 cells. Cell cycle analysis indicated that most of K562 and Molm-13 cells were captured in G0/G1 phase by TRAF7 overexpression. PCR and western blot assay revealed that TRAF7 increased Kruppel-like factor 2 (KLF2) expression but decreased 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3 (PFKFB3) expression in AML cells. KLF2 knockdown can counteract TRAF7-triggered PFKFB3 inhibition, and abolish TRAF7-mediated glycolysis inhibition and cell cycle arrest. KLF2 knockdown or PFKFB3 overexpression both can partially neutralize TRAF7-induced growth inhibition and apoptosis of K562 and Molm-13 cells. Moreover, Lv-TRAF7 decreased human CD45+ cells in mouse peripheral blood in the xenograft mice established by NOD/SCID mice. Taken together, TRAF7 exerts anti-leukemia effects by impairing glycolysis and cell cycle progression of myeloid leukemia cells via modulating the KLF2-PFKFB3 axis.
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Affiliation(s)
- Lin Zou
- Priority Medical Department, General Hospital of Central Theater Command, Wuhan, 430070, Hubei, China
| | - Ye Fang
- Priority Medical Department, General Hospital of Central Theater Command, Wuhan, 430070, Hubei, China
| | - Wei He
- Priority Medical Department, General Hospital of Central Theater Command, Wuhan, 430070, Hubei, China.
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Zhou Y, Liu H, Wang R, Zhang M. Circ_0043256 upregulates KLF2 expression by absorbing miR-1206 to suppress the tumorigenesis of lung cancer. Thorac Cancer 2023; 14:683-699. [PMID: 36680456 PMCID: PMC9981313 DOI: 10.1111/1759-7714.14794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/26/2022] [Accepted: 12/27/2022] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Circular RNAs (circRNAs) have been reported to play roles in lung cancer development. The purpose of this work was to explore the function and mechanism of circ_0043256 in lung cancer tumorigenesis. METHODS Quantitative real-time polymerase chain reaction (qRT-PCR) and western blot were used for the detection of the levels of genes and proteins. Cell growth, angiogenesis ability, migration, and invasion were analyzed by using 5-ethynyl-2'-deoxyuridine (EdU) assay, flow cytometry, tube formation assay, transwell assay, and murine xenograft model, respectively. The target between miR-1206 and circ_0043256 or Krüppel-like factor 2 (KLF2) was verified by dual-luciferase reporter assay. RESULTS Circ_0043256 was a stable circRNA, which was found to be decreased in lung cancer tissues and cells. Functionally, forced expression of circ_0043256 suppressed lung cancer cell growth, angiopoiesis, migration, and invasion. Mechanistically, circ_0043256 directly bound to miR-1206 and miR-1206 targeted KLF2, circ_0043256 could regulate KLF2 expression via absorbing miR-1206. Rescue assay showed that miR-1206 overexpression reversed the anticancer effects of circ_0043256 on lung cancer cells. Moreover, inhibition of miR-1206 could suppress the malignant phenotypes of lung cancer cells, which was attenuated by KLF2 knockdown. Pre-clinically, lentivirus-mediated circ_0043256 overexpression impeded lung cancer growth in nude mice. CONCLUSION Forced expression of circ_0043256 could impede the tumorigenesis of lung cancer via miR-1206/KLF2 axis, indicating a potential therapeutic approach for lung cancer.
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Affiliation(s)
- Ying Zhou
- Department of Respiratory and Critical Care Medicine, Jingmen No.1 People's Hospital, Jingmen, China
| | - Hongliu Liu
- Department of Oncology, Jingmen No.1 People's Hospital, Jingmen, China
| | - Rui Wang
- Department of Oncology, Jingmen No.1 People's Hospital, Jingmen, China
| | - Mingtao Zhang
- Department of Oncology, Jingmen No.1 People's Hospital, Jingmen, China
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Chrysanthopoulou A, Antoniadou C, Natsi AM, Gavriilidis E, Papadopoulos V, Xingi E, Didaskalou S, Mikroulis D, Tsironidou V, Kambas K, Koffa M, Skendros P, Ritis K. Down-regulation of KLF2 in lung fibroblasts is linked with COVID-19 immunofibrosis and restored by combined inhibition of NETs, JAK-1/2 and IL-6 signaling. Clin Immunol 2023; 247:109240. [PMID: 36693535 PMCID: PMC9862710 DOI: 10.1016/j.clim.2023.109240] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 01/22/2023]
Abstract
Kruppel-like factor 2 (KLF2) has been linked with fibrosis and neutrophil-associated thromboinflammation; however, its role in COVID-19 remains elusive. We investigated the effect of disease microenvironment on the fibrotic potential of human lung fibroblasts (LFs) and its association with KLF2 expression. LFs stimulated with plasma from severe COVID-19 patients down-regulated KLF2 expression at mRNA/protein and functional level acquiring a pre-fibrotic phenotype, as indicated by increased CCN2/collagen levels. Pre-incubation with the COMBI-treatment-agents (DNase I and JAKs/IL-6 inhibitors baricitinib/tocilizumab) restored KLF2 levels of LFs to normal abolishing their fibrotic activity. LFs stimulated with plasma from COMBI-treated patients at day-7 expressed lower CCN2 and higher KLF2 levels, compared to plasma prior-to-treatment, an effect not observed in standard-of-care treatment. In line with this, COMBI-treated patients had better outcome than standard-of-care group. These data link fibroblast KLF2 with NETosis and JAK/IL-6 signaling, suggesting the potential of combined therapeutic strategies in immunofibrotic diseases, such as COVID-19.
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Affiliation(s)
- Akrivi Chrysanthopoulou
- Laboratory of Molecular Hematology, Department of Medicine, Democritus University of Thrace, Alexandroupolis, Greece
| | - Christina Antoniadou
- First Department of Internal Medicine, University Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece
| | - Anastasia-Maria Natsi
- Laboratory of Molecular Hematology, Department of Medicine, Democritus University of Thrace, Alexandroupolis, Greece
| | - Efstratios Gavriilidis
- First Department of Internal Medicine, University Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece
| | - Vasileios Papadopoulos
- First Department of Internal Medicine, University Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece
| | - Evangelia Xingi
- Light Microscopy Unit, Hellenic Pasteur Institute, Athens, Greece
| | - Stylianos Didaskalou
- Laboratory of Cell Biology, Proteomics and Cell Cycle, Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | - Dimitrios Mikroulis
- Department of Cardiovascular Surgery, University Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece
| | - Victoria Tsironidou
- Laboratory of Molecular Hematology, Department of Medicine, Democritus University of Thrace, Alexandroupolis, Greece
| | - Konstantinos Kambas
- Laboratory of Molecular Genetics, Department of Immunology, Hellenic Pasteur Institute, Athens, Greece
| | - Maria Koffa
- Laboratory of Cell Biology, Proteomics and Cell Cycle, Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | - Panagiotis Skendros
- Laboratory of Molecular Hematology, Department of Medicine, Democritus University of Thrace, Alexandroupolis, Greece; First Department of Internal Medicine, University Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece.
| | - Konstantinos Ritis
- Laboratory of Molecular Hematology, Department of Medicine, Democritus University of Thrace, Alexandroupolis, Greece; First Department of Internal Medicine, University Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece.
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Li YZ, Xie J, Wang RQ, Gao XQ, Liu PJ, Liu J. KLF2 is a clinical diagnostic and treatment biomarker of breast cancer. Front Cell Dev Biol 2023; 11:1182123. [PMID: 37123417 PMCID: PMC10133575 DOI: 10.3389/fcell.2023.1182123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 04/03/2023] [Indexed: 05/02/2023] Open
Abstract
Background: As a highly prevalent malignancy among women worldwide, breast cancer, remains a critical public health issue necessitating the development of novel therapeutics and biomarkers. Kruppel Like Factor 2 (KLF2), a member of the Kruppel family of transcription factors, has been implicated in various types of cancer due to its diminished expression; however, the potential implications of KLF2 expression in relation to breast cancer progression, prognosis, and therapy remain unclear. Methods: The present study employed the Tumor Immune Estimation Resource (TIMER) and The Human Protein Atlas databases to investigate the expression pattern of KLF2 in pan-cancer. The relationship between KLF2 expression and clinical features or immune infiltration of The Cancer Genome Atlas (TCGA) breast cancer samples was evaluated using Breast Cancer Integrative Platform (BCIP) and TIMER. The expression levels of KLF2 in breast cancer were validated via immunohistochemical staining analysis. Gene Set Enrichment Analysis (GSEA) to study the KLF2-related gene ontology. STRING database was employed to construct a protein-protein interaction (PPI) network of KLF2 in relation to vascular endothelial growth factor A (VEGFA) and hypoxia-inducible factor 1α (HIF1α). The expression of KLF2 following diverse breast cancer therapies was analyzed in the Gene Expression Omnibus (GEO) databases. The expression of KLF2 following treatment with simvastatin was validated via immunofluorescence and western blotting. Results: Our study reveals that KLF2 displays significantly reduced expression in cancerous tissues compared to non-cancerous controls. Patients with low KLF2 expression levels exhibited poor prognosis across multiple cancer types. KLF2 expression levels were found to be reduced in advanced cancer stages and grades, while positively correlated with the expression of estrogen receptor (ER), progesterone receptor (PR), and tumor size in breast cancer. KLF2 expression is associated with diverse immune infiltration cells, and may impact the breast tumor immune microenvironment by regulating dendritic cell activation. Additionally, we observed a negative correlation between KLF2 expression levels and angiogenesis, as well as the expression of VEGFA and HIF1α. Notably, the anticancer drug simvastatin could induce KLF2 expression in both breast cancer. Conclusion: Based on our observations, KLF2 has potential as a diagnostic, prognostic, and therapeutic biomarker for breast cancer.
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Affiliation(s)
- Ya-Zhao Li
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
- Key Laboratory for Tumor Precision Medicine of Shaanxi Province, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Juan Xie
- Department of Clinical Laboratory, Shaanxi Provincial People’s Hospital, Xi’an, Shaanxi, China
| | - Rui-Qi Wang
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
- Key Laboratory for Tumor Precision Medicine of Shaanxi Province, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Xiao-Qian Gao
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
- Key Laboratory for Tumor Precision Medicine of Shaanxi Province, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Pei-Jun Liu
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
- Key Laboratory for Tumor Precision Medicine of Shaanxi Province, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
- *Correspondence: Pei-Jun Liu, ; Jie Liu,
| | - Jie Liu
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
- Key Laboratory for Tumor Precision Medicine of Shaanxi Province, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
- *Correspondence: Pei-Jun Liu, ; Jie Liu,
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Yu Z, Chen Z, Zhou G, Zhou X, Ma H, Yu Y, Wang X, Cao X. miR-92a-3p promotes breast cancer proliferation by regulating the KLF2/BIRC5 axis. Thorac Cancer 2022; 13:2992-3000. [PMID: 36100919 PMCID: PMC9626348 DOI: 10.1111/1759-7714.14648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 08/25/2022] [Accepted: 08/28/2022] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Breast cancer remains the most common malignancy in females around the world. Recently, a growing number of studies have focused on gene dysregulation. In our previous study, Krüppel-like factors (KLFs) were found to play essential roles in breast cancer development, among which KLF2 could function as a tumor suppressor. Nevertheless, the underlying molecular mechanism remains unclear. METHODS miR-92a-3p was identified as the upstream regulator of KLF2 by starBase v.3.0. The regulation of KLF2 by miR-92a-3p was verified by a series of in vitro and in vivo assays. Further exploration revealed that Baculoviral IAP Repeat Containing 5 (BIRC5) was the target of KLF2. ChIP assay, dual-luciferase reporter analysis, quantitative real-time PCR, and western blot were performed for verification. RESULTS miR-92a-3p functioned as a tumor promoter by inhibiting KLF2 by binding to its 3'-untranslated region (3'-UTR). In addition, KLF2 could transcriptionally suppress the expression of BIRC5. CONCLUSION Collectively, our results uncovered the miR-92a-3p/KLF2/BIRC5 axis in breast cancer and provided a potential mechanism for breast cancer development, which may serve as promising strategies for breast cancer therapy.
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Affiliation(s)
- Zhi‐Hao Yu
- The First Department of Breast CancerTianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for CancerTianjinChina,Key Laboratory of Cancer Prevention and TherapyTianjinChina,Tianjin's Clinical Research Center for CancerTianjinChina,Key Laboratory of Breast Cancer Prevention and TherapyTianjin Medical University, Ministry of EducationTianjinChina
| | - Zhao‐Hui Chen
- The First Department of Breast CancerTianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for CancerTianjinChina,Key Laboratory of Cancer Prevention and TherapyTianjinChina,Tianjin's Clinical Research Center for CancerTianjinChina,Key Laboratory of Breast Cancer Prevention and TherapyTianjin Medical University, Ministry of EducationTianjinChina
| | - Guang‐Lei Zhou
- The First Department of Breast CancerTianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for CancerTianjinChina,Key Laboratory of Cancer Prevention and TherapyTianjinChina,Tianjin's Clinical Research Center for CancerTianjinChina,Key Laboratory of Breast Cancer Prevention and TherapyTianjin Medical University, Ministry of EducationTianjinChina
| | - Xue‐Jie Zhou
- The First Department of Breast CancerTianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for CancerTianjinChina,Key Laboratory of Cancer Prevention and TherapyTianjinChina,Tianjin's Clinical Research Center for CancerTianjinChina,Key Laboratory of Breast Cancer Prevention and TherapyTianjin Medical University, Ministry of EducationTianjinChina
| | - Hai‐Yan Ma
- The First Department of Breast CancerTianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for CancerTianjinChina,Key Laboratory of Cancer Prevention and TherapyTianjinChina,Tianjin's Clinical Research Center for CancerTianjinChina,Key Laboratory of Breast Cancer Prevention and TherapyTianjin Medical University, Ministry of EducationTianjinChina
| | - Yue Yu
- The First Department of Breast CancerTianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for CancerTianjinChina,Key Laboratory of Cancer Prevention and TherapyTianjinChina,Tianjin's Clinical Research Center for CancerTianjinChina,Key Laboratory of Breast Cancer Prevention and TherapyTianjin Medical University, Ministry of EducationTianjinChina
| | - Xin Wang
- The First Department of Breast CancerTianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for CancerTianjinChina,Key Laboratory of Cancer Prevention and TherapyTianjinChina,Tianjin's Clinical Research Center for CancerTianjinChina,Key Laboratory of Breast Cancer Prevention and TherapyTianjin Medical University, Ministry of EducationTianjinChina
| | - Xu‐Chen Cao
- The First Department of Breast CancerTianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for CancerTianjinChina,Key Laboratory of Cancer Prevention and TherapyTianjinChina,Tianjin's Clinical Research Center for CancerTianjinChina,Key Laboratory of Breast Cancer Prevention and TherapyTianjin Medical University, Ministry of EducationTianjinChina
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25
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Chen T, Shi Z, Zhao Y, Meng X, Zhao S, Zheng L, Han X, Hu Z, Yao Q, Lin H, Du X, Zhang K, Han T, Hong W. LncRNA Airn maintains LSEC differentiation to alleviate liver fibrosis via the KLF2-eNOS-sGC pathway. BMC Med 2022; 20:335. [PMID: 36171606 PMCID: PMC9520944 DOI: 10.1186/s12916-022-02523-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 08/10/2022] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Long noncoding RNAs (lncRNAs) have emerged as important regulators in a variety of human diseases. The dysregulation of liver sinusoidal endothelial cell (LSEC) phenotype is a critical early event in the fibrotic process. However, the biological function of lncRNAs in LSEC still remains unclear. METHODS The expression level of lncRNA Airn was evaluated in both human fibrotic livers and serums, as well as mouse fibrotic livers. Gain- and loss-of-function experiments were performed to detect the effect of Airn on LSEC differentiation and hepatic stellate cell (HSC) activation in liver fibrosis. Furthermore, RIP, RNA pull-down-immunoblotting, and ChIP experiments were performed to explore the underlying mechanisms of Airn. RESULTS We have identified Airn was significantly upregulated in liver tissues and LSEC of carbon tetrachloride (CCl4)-induced liver fibrosis mouse model. Moreover, the expression of AIRN in fibrotic human liver tissues and serums was remarkably increased compared with healthy controls. In vivo studies showed that Airn deficiency aggravated CCl4- and bile duct ligation (BDL)-induced liver fibrosis, while Airn over-expression by AAV8 alleviated CCl4-induced liver fibrosis. Furthermore, we revealed that Airn maintained LSEC differentiation in vivo and in vitro. Additionally, Airn inhibited HSC activation indirectly by regulating LSEC differentiation and promoted hepatocyte (HC) proliferation by increasing paracrine secretion of Wnt2a and HGF from LSEC. Mechanistically, Airn interacted with EZH2 to maintain LSEC differentiation through KLF2-eNOS-sGC pathway, thereby maintaining HSC quiescence and promoting HC proliferation. CONCLUSIONS Our work identified that Airn is beneficial to liver fibrosis by maintaining LSEC differentiation and might be a serum biomarker for liver fibrogenesis.
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Affiliation(s)
- Ting Chen
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Zhemin Shi
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Yanmian Zhao
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Xiaoxiang Meng
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Sicong Zhao
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Lina Zheng
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Xiaohui Han
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Zhimei Hu
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Qingbin Yao
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Huajiang Lin
- Department of Hepatology and Gastroenterology, Tianjin Union Medical Center, Tianjin Medical University, Tianjin Union Medical Center affiliated to Nankai University, Tianjin, China
| | - Xiaoxiao Du
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Kun Zhang
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.
| | - Tao Han
- Department of Hepatology and Gastroenterology, Tianjin Union Medical Center, Tianjin Medical University, Tianjin Union Medical Center affiliated to Nankai University, Tianjin, China.
| | - Wei Hong
- Department of Histology and Embryology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.
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Li M, Zhang M, Chen M, Xiao J, Mu X, Peng J, Fan J. KLF2-induced circZKSCAN1 potentiates the tumorigenic properties of clear cell renal cell carcinoma by targeting the miR-1294/PIM1 axis. Cell Cycle 2022; 21:1376-1390. [PMID: 35285410 PMCID: PMC9345621 DOI: 10.1080/15384101.2022.2051293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Clear cell renal cell carcinoma (ccRCC) is one of the most common and lethal types of urologic cancer. With low survival rates among patients in advanced stages of disease, and increasing rate of morbidity and mortality worldwide, novel therapeutic targets for ccRCC clinical intervention are necessary. In this study, we investigated the functional role of circZKSCAN1 in ccRCC progression. Our results suggested that circZKSCAN1 was abundantly expressed in ccRCC tumor tissues and cells. CircZKSCAN1 knockdown significantly inhibited cell proliferation, migration, invasion, and epithelial-to-mesenchymal transition of renal cell carcinoma (RCC) cells, whereas potentiated Natural Killer (NK) cell-mediated cytotoxicity against RCC cells in vitro and repressed tumor growth in vivo. Furthermore, we identified a novel circZKSCAN1/miR-1294/PIM1 axis was identified in RCC progression, showing that the expression of circZKSCAN1 expression in RCC cells was transcriptionally regulated by Kruppel-like factor 2. The results of our study may provide new insights for ccRCC basic research.Abbreviations: ccRCC: clear cell renal cell carcinoma; ChIP: chromatin immunoprecipitation; circRNA: circular RNA; EDU: 5-ethynyl-2'-deoxyuridine; EMT: epithelial-mesenchymal transition; FBS: fetal bovine serum; FISH: RNA fluorescent in situ hybridization; KLF2: Kruppel-like factor 2; NC: normal control; NK cell: natural killer cell; NOD/SCID: nonobese severe diabetic/severe combined immunodeficiency; PIM1: Pim-1 proto-oncogene, serine/threonine kinase; RCC: renal cell carcinoma; ZKSCAN1: zinc finger with KRAB and SCAN domains 1.
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Affiliation(s)
- Mingzi Li
- Department of Urology, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, Shanghai, China
| | - Mingxun Zhang
- Department of Pathology, the First Affiliated Hospital of Ustc, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China.,Intelligent Pathology Institute, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Muling Chen
- Department of Urology, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, Shanghai, China
| | - Jiantao Xiao
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, China
| | - Xingyu Mu
- Department of Urology, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, Shanghai, China
| | - Jingtao Peng
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Jie Fan
- Department of Urology, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, Shanghai, China
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Huang J, Lan H, Xie C, Wei C, Liu Z, Huang Z, Zhou Z, Chen L. Pramipexole Protects Against Traumatic Brain Injury-Induced Blood-Brain Barrier (BBB) Dysfunction. Neurotox Res 2022; 40:1020-1028. [PMID: 35524855 DOI: 10.1007/s12640-022-00495-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Revised: 03/13/2022] [Accepted: 03/22/2022] [Indexed: 10/18/2022]
Abstract
Traumatic brain injury (TBI) is a severe disease of brain damage accompanied by blood-brain barrier (BBB) dysfunction. The BBB is composed of brain microvascular endothelial cells (BMECs), astrocyte terminus, pericytes, and a basement membrane. Tight junction proteins expressed by BMECs play important roles in preserving BBB integrity. Pramipexole is a selective dopamine agonist applied for treating Parkinson's disease and has been recently claimed with neuroprotective capacity. This study will further explore the impact of Pramipexole on tight junctions and BBB integrity to provide the potential treatment strategy for TBI-induced BBB damage. The TBI model was established in mice and was identified by the promoted brain water content, declined Garcia scores, reduced latency of the rotarod test, aggravated pathological changes in the brain cortex, and excessively released inflammatory factors. After treatment with Pramipexole, the neurofunctional deficits, behavioral disability, and aggravated pathological changes were dramatically reversed, accompanied by the alleviated BBB permeability, and upregulated occludin, an important tight junction protein. TBI model cells were established by the scratching bEnd.3 cells method. Cells were stimulated with 10 and 20 μM Pramipexole, followed by exposure to TBI. Increased fluorescence intensity of FITC-dextran, reduced value of TEER, and downregulated occludin and KLF2 were observed in TBI-exposed cells, all of which were greatly reversed by 10 and 20 μM Pramipexole. Furthermore, in KLF2-silenced bEnd.3 cells, the protective ability of Pramipexole against endothelial permeability and the expression level of occludin were dramatically abolished. Collectively, our results suggest that Pramipexole protected against TBI-induced BBB dysfunction by mediating KLF2.
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Affiliation(s)
- Junping Huang
- Department of Neurosurgery, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530001, Guangxi, China
| | - Huan Lan
- Department of Neurosurgery, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530001, Guangxi, China
| | - Changji Xie
- Department of Neurosurgery, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530001, Guangxi, China
| | - Chengcong Wei
- Department of Neurosurgery, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530001, Guangxi, China
| | - Zhen Liu
- Department of Neurosurgery, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530001, Guangxi, China
| | - Zhixi Huang
- Department of Neurosurgery, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530001, Guangxi, China
| | - Zhiyu Zhou
- Department of Neurosurgery, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530001, Guangxi, China.
| | - Lei Chen
- Department of Neurosurgery, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan People's Hospital, Qingyuan, 511500, Guangdong, China.
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Wang FF, Zhang JL, Ji Y, Yan XJ, Sun L, Zhu Y, Jin H. KLF2 mediates the suppressive effect of BDNF on diabetic intimal calcification by inhibiting HK1 induced endothelial-to-mesenchymal transition. Cell Signal 2022; 94:110324. [PMID: 35364229 DOI: 10.1016/j.cellsig.2022.110324] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 03/19/2022] [Accepted: 03/24/2022] [Indexed: 12/19/2022]
Abstract
Diabetic vascular calcification in the arterial intima is closely associated with endothelial-to-mesenchymal transition (EndMT). Glucose metabolism reprogramming is involved in EndMT. Although brain-derived neurotrophic factor (BDNF) and Krüppel-like family of transcription factor 2 (KLF2) play protective roles in the physiological activity of the vascular endothelium, the underlying mechanisms are unclear. Human umbilical vein endothelial cells (HUVECs) were incubated with diabetic osteogenic medium (DOM) to induce EndMT and accelerate osteogenic differentiation. Glycolysis in HUVECs was assessed by monitoring glucose uptake, lactate production, extracellular acidification rate and expression of key glycolytic enzymes. DOM induced EndMT and accelerated osteo-induction in HUVECs, which was alleviated by BDNF/tropomyosin receptor kinase B (TrkB) pathway. Mechanistically, DOM caused hyperactivation of glycolysis in HUVECs and inhibition of the BDNF/TrkB pathway. BDNF preserved KLF2 and downregulated hexokinase 1 (HK1) in HUVECs after DOM treatment. Furthermore, KLF2 interacted with HK1. Increased KLF2 alleviated HK1-mediated glucose metabolism abnormality. HK1 knockdown or a targeted glycolysis inhibitor suppressed EndMT, apoptosis, inflammation and vascular calcification of HUVECs after DOM exposure. This study suggests that KLF2 mediates the suppressive effect of BDNF on diabetic intimal calcification by inhibiting HK1-induced glucose metabolism reprogramming and the EndMT process.
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Affiliation(s)
- Fang-Fang Wang
- Department of Cardiology, The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical University, Changzhou 213000, PR China
| | - Jia-Li Zhang
- Department of Gastroenterology Centre, The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical University, Changzhou 213000, PR China
| | - Yuan Ji
- Department of Cardiology, The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical University, Changzhou 213000, PR China
| | - Xue-Jiao Yan
- Department of Cardiology, The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical University, Changzhou 213000, PR China
| | - Ling Sun
- Department of Cardiology, The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical University, Changzhou 213000, PR China
| | - Yi Zhu
- Department of Cardiology, The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical University, Changzhou 213000, PR China.
| | - Hong Jin
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, PR China.
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Han F, Huang D, Meng J, Chu J, Wang M, Chen S. miR-126-5p enhances radiosensitivity of lung adenocarcinoma cells by inhibiting EZH2 via the KLF2/BIRC axis. J Cell Mol Med 2022; 26:2529-2542. [PMID: 35322532 PMCID: PMC9077299 DOI: 10.1111/jcmm.17135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 10/21/2021] [Accepted: 11/23/2021] [Indexed: 11/30/2022] Open
Abstract
Radiotherapy is a common method for the treatment of lung adenocarcinoma, but it often fails due to the relative non‐susceptibility of lung adenocarcinoma cells to radiation. We aimed to discuss the related mechanisms by which miR‐126‐5p might mediate radiosensitivity of lung adenocarcinoma cells. The binding affinity between miR‐126‐5p and EZH2 and between KLF2 and BIRC5 was identified using multiple assays. A549 and H1650 cells treated with X‐ray were transfected with miR‐126‐5p mimic/inhibitor, oe‐EZH2, or si‐KLF2 to detect cell biological functions and radiosensitivity. Finally, lung adenocarcinoma nude mouse models were established. miR‐126‐5p and KLF2 were poorly expressed, while EZH2 and BIRC5 were upregulated in lung adenocarcinoma tissues and cells. miR‐126‐5p targeted EZH2 to promote the KLF2 expression so as to inhibit BIRC5 activation. Both in vitro and in vivo experiments verified that elevated miR‐126‐5p inhibited cell migration and promoted apoptosis to enhance the sensitivity of lung adenocarcinoma cells to radiotherapy via the EZH2/KLF2/BIRC5 axis. Collectively, miR‐126‐5p downregulated EZH2 to facilitate the sensitivity of lung adenocarcinoma cells to radiotherapy via KLF2/BIRC5.
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Affiliation(s)
- Fushi Han
- Department of Nuclear Medicine, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Dongdong Huang
- Department of Emergency Medicine, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jinqian Meng
- Department of Radiology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jiapeng Chu
- Department of Cardiology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Meng Wang
- Department of Radiotherapy, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Shuzhen Chen
- Department of Nuclear Medicine, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
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Min J, Ma J, Wang Q, Yu D. Long non-coding RNA SNHG1 promotes bladder cancer progression by upregulating EZH2 and repressing KLF2 transcription. Clinics (Sao Paulo) 2022; 77:100081. [PMID: 36087568 PMCID: PMC9468346 DOI: 10.1016/j.clinsp.2022.100081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 06/02/2022] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVE Long Non-Coding RNAs (LncRNAs) act as an indispensable role in cancer development. The study aimed to investigate the role and mechanism of lncRNA Small Nucleolar RNA Host Gene 1 (SNHG1) in Bladder Cancer (BC) progression. METHOD The expression, prognostic value, diagnostic value, and correlation of SNHG1, Enhancer of Zeste 2 polycomb repressive complex 2 subunit (EZH2), and Kruppel Like Factor 2 (KLF2) were analyzed through bioinformatics analysis. The expression was also validated in BC tissues and cell lines. Besides, their regulation and binding were tested via qPCR, Western blot, Dual-Luciferase Reporter Assay (DLRA), Argonaute RISC catalytic component 2-RNA Immunoprecipitation (AGO2-RIP), and Chromatin Immunoprecipitation (ChIP). A xenograft model in nude mice was also established. RESULTS SNHG1 was significantly overexpressed in BC tissues and cells. Importantly, SNHG1 was associated with poor survival, and ROC curves revealed high diagnostic values. Moreover, by CCK8, wound healing, transwell, and Western blot analysis, SNHG1 knockdown significantly inhibited the proliferation, migration, invasion, and epithelial-mesenchymal transition of BC cells. Additionally, in vivo experiments showed that silencing SNHG1 hindered tumorigenesis and tumor growth. Regarding mechanism, the results of AGO2-RIP, ChIP or DLRA showed that SNHG1 played different roles at diverse subcellular sites. In the cytoplasm, SNHG1 acted as a competing endogenous RNA for miR-137-3p to promote EZH2 expression. In the nucleus, SNHG1 could interact with EZH2 to inhibit KLF2 transcription. CONCLUSION Our study elucidated that SNHG1 formed a regulatory network and played an oncogenic role in BC, which provided a novel therapeutic target for BC treatment.
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Affiliation(s)
- Jie Min
- Department of Urology, The Second Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Jiaxing Ma
- Department of Urology, The Second Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Qi Wang
- Department of Urology, The Second Hospital of Anhui Medical University, Hefei, Anhui, China.
| | - Dexin Yu
- Department of Urology, The Second Hospital of Anhui Medical University, Hefei, Anhui, China.
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Mastej V, Axen C, Wary A, Minshall RD, Wary KK. A requirement for Krüppel Like Factor-4 in the maintenance of endothelial cell quiescence. Front Cell Dev Biol 2022; 10:1003028. [PMID: 36425528 PMCID: PMC9679496 DOI: 10.3389/fcell.2022.1003028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 08/24/2022] [Indexed: 11/10/2022] Open
Abstract
Rationale and Goal: Endothelial cells (ECs) are quiescent and critical for maintaining homeostatic functions of the mature vascular system, while disruption of quiescence is at the heart of endothelial to mesenchymal transition (EndMT) and tumor angiogenesis. Here, we addressed the hypothesis that KLF4 maintains the EC quiescence. Methods and Results: In ECs, KLF4 bound to KLF2, and the KLF4-transctivation domain (TAD) interacted directly with KLF2. KLF4-depletion increased KLF2 expression, accompanied by phosphorylation of SMAD3, increased expression of alpha-smooth muscle actin (αSMA), VCAM-1, TGF-β1, and ACE2, but decreased VE-cadherin expression. In the absence of Klf4, Klf2 bound to the Klf2-promoter/enhancer region and autoregulated its own expression. Loss of EC-Klf4 in Rosa mT/mG ::Klf4 fl/fl ::Cdh5 CreERT2 engineered mice, increased Klf2 levels and these cells underwent EndMT. Importantly, these mice harboring EndMT was also accompanied by lung inflammation, disruption of lung alveolar architecture, and pulmonary fibrosis. Conclusion: In quiescent ECs, KLF2 and KLF4 partnered to regulate a combinatorial mechanism. The loss of KLF4 disrupted this combinatorial mechanism, thereby upregulating KLF2 as an adaptive response. However, increased KLF2 expression overdrives for the loss of KLF4, giving rise to an EndMT phenotype.
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Affiliation(s)
- Victoria Mastej
- Department of Pharmacology and Regenerative Medicine, University of Illinois, Chicago, IL, United States
| | - Cassondra Axen
- Department of Pharmacology and Regenerative Medicine, University of Illinois, Chicago, IL, United States
| | - Anita Wary
- Department of Pharmacology and Regenerative Medicine, University of Illinois, Chicago, IL, United States
| | - Richard D Minshall
- Department of Pharmacology and Regenerative Medicine, University of Illinois, Chicago, IL, United States
| | - Kishore K Wary
- Department of Pharmacology and Regenerative Medicine, University of Illinois, Chicago, IL, United States
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Lu Y, Qin H, Jiang B, Lu W, Hao J, Cao W, Du L, Chen W, Zhao X, Guo H. KLF2 inhibits cancer cell migration and invasion by regulating ferroptosis through GPX4 in clear cell renal cell carcinoma. Cancer Lett 2021; 522:1-13. [PMID: 34520818 DOI: 10.1016/j.canlet.2021.09.014] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 09/06/2021] [Accepted: 09/09/2021] [Indexed: 01/22/2023]
Abstract
The metastatic dissemination and underlying mechanisms of clear cell renal cell carcinoma (ccRCC) remain insufficiently understood. In this study, we identified the essential role of KLF2 in suppressing the metastasis of ccRCC. Downregulation of KLF2 detected by immunohistochemistry in primary metastatic ccRCC was remarkably related to poor clinical outcomes. Overexpression of KLF2 in vitro inhibited growth, migration and invasion of RCC cells. Analysis of clinical specimens revealed that there is a close correlation between KLF2 and GPX4 in ccRCC. Mechanistically, KLF2 deficiency is sufficient to inhibit ferroptosis on account of the impairment of transcriptional repression of GPX4 and thus promotes the migration and invasion of RCC cells. Reverting KLF2 expression in vivo decreased pulmonary metastatic lesions and prolonged life span of mice, whereas GPX4 overexpression reversed these properties. Overall, our results established a novel critical pathway that drives human ccRCC invasion and metastasis, which could be a promising target regarding to the therapies of advanced ccRCC in the clinic.
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Affiliation(s)
- Yingqiang Lu
- Department of Urology, Nanjing Drum Tower Hospital, Clinical College of Nanjing Medical University, Nanjing, 210008, PR China
| | - Haixiang Qin
- Department of Urology, Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School, Nanjing, 210008, PR China
| | - Bo Jiang
- Department of Urology, Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School, Nanjing, 210008, PR China
| | - Wenfeng Lu
- Department of Urology, Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School, Nanjing, 210008, PR China
| | - Jiange Hao
- Department of Urology, Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School, Nanjing, 210008, PR China
| | - Wenmin Cao
- Department of Urology, Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School, Nanjing, 210008, PR China
| | - Lin Du
- Department of Urology, Nanjing Drum Tower Hospital, Medical School of Southeast University, Nanjing, 210008, PR China
| | - Wei Chen
- Department of Urology, Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School, Nanjing, 210008, PR China
| | - Xiaozhi Zhao
- Department of Urology, Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School, Nanjing, 210008, PR China
| | - Hongqian Guo
- Department of Urology, Nanjing Drum Tower Hospital, Clinical College of Nanjing Medical University, Nanjing, 210008, PR China; Department of Urology, Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School, Nanjing, 210008, PR China.
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Hou Z, Chen J, Yang H, Hu X, Yang F. microRNA-26a shuttled by extracellular vesicles secreted from adipose-derived mesenchymal stem cells reduce neuronal damage through KLF9-mediated regulation of TRAF2/ KLF2 axis. Adipocyte 2021; 10:378-393. [PMID: 34311651 PMCID: PMC8320674 DOI: 10.1080/21623945.2021.1938829] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Extracellular vesicles (EVs) are nano-sized vesicles secreted actively by numeorus cells and have fundamental roles in intercellular communication through shuttling functional RNAs. This study sets out to elucidate the role of microRNA-26a (miR-26a) shuttled by EVs derived from adipose-derived mesenchymal stem cells (ASCs) in neuronal damage. After extraction and identification of ASC-derived EVs (ASC-EVs), mouse cortical neuronal cells were selected to establish an in vivo cerebral ischemia/reperfusion mouse model and an in vitro oxygen glucose deprivation/reperfusion (OGD/RP) cell model. The downstream genes of miR-26a were analyzed. The gain- and loss-of function of miR-26a and KLF9 was performed in mouse and cell models. Neuronal cells were subjected to co-culture with ASC-EVs and biological behaviors were detected by flow cytometry, Motic Images Plus, TTC, TUNEL staining, qRT-PCR and western blot analysis. ASC-EVs protected neuronal cells against neuronal damage following cerebral ischemia/reperfusion, which was related to transfer of miR-26a into neuronal cells. In neuronal cells, miR-26a targeted KLF9. KLF9 could suppress the expression of TRAF2 and KLF2 to facilitate neuronal damage. In vitro and in vivo results showed that miR-26a delivered by ASC-EVs inhibited neuronal damage. In summary, ASC-EVs-derived miR-26a can arrest neuronal damage by disrupting the KLF9-meidated suppression on TRAF2/KLF2 axis.
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Affiliation(s)
- Zixin Hou
- Department of Anesthesiology, The First Affiliated Hospital of University of South China, Hengyang, P. R. China
| | - Ji Chen
- Department of Endocrinology, The First Affiliated Hospital of University of South China, Hengyang, P. R. China
| | - Huan Yang
- Department of Anesthesiology, The First Affiliated Hospital of University of South China, Hengyang, P. R. China
| | - Xiaoling Hu
- Department of Anesthesiology, The First Affiliated Hospital of University of South China, Hengyang, P. R. China
| | - Fengrui Yang
- Department of Anesthesiology, The First Affiliated Hospital of University of South China, Hengyang, P. R. China
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Linnenberger R, Hoppstädter J, Wrublewsky S, Ampofo E, Kiemer AK. Statins and Bempedoic Acid: Different Actions of Cholesterol Inhibitors on Macrophage Activation. Int J Mol Sci 2021; 22:12480. [PMID: 34830364 DOI: 10.3390/ijms222212480] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/15/2021] [Accepted: 11/16/2021] [Indexed: 01/20/2023] Open
Abstract
Statins represent the most prescribed class of drugs for the treatment of hypercholesterolemia. Effects that go beyond lipid-lowering actions have been suggested to contribute to their beneficial pharmacological properties. Whether and how statins act on macrophages has been a matter of debate. In the present study, we aimed at characterizing the impact of statins on macrophage polarization and comparing these to the effects of bempedoic acid, a recently registered drug for the treatment of hypercholesterolemia, which has been suggested to have a similar beneficial profile but fewer side effects. Treatment of primary murine macrophages with two different statins, i.e., simvastatin and cerivastatin, impaired phagocytotic activity and, concurrently, enhanced pro-inflammatory responses upon short-term lipopolysaccharide challenge, as characterized by an induction of tumor necrosis factor (TNF), interleukin (IL) 1β, and IL6. In contrast, no differences were observed under long-term inflammatory (M1) or anti-inflammatory (M2) conditions, and neither inducible NO synthase (iNOS) expression nor nitric oxide production was altered. Statin treatment led to extracellular-signal regulated kinase (ERK) activation, and the pro-inflammatory statin effects were abolished by ERK inhibition. Bempedoic acid only had a negligible impact on macrophage responses when compared with statins. Taken together, our data point toward an immunomodulatory effect of statins on macrophage polarization, which is absent upon bempedoic acid treatment.
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Wang G, Tian F, Li Y, Liu Y, Liu C. Ramelteon Mitigates Free Fatty Acid (FFA)-Induced Attachment of Monocytes to Brain Vascular Endothelial Cells. Neurotox Res 2021; 39:1937-1945. [PMID: 34792763 DOI: 10.1007/s12640-021-00422-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 09/09/2021] [Accepted: 09/17/2021] [Indexed: 11/25/2022]
Abstract
Acute ischemic stroke is a challenging disease that threatens the life of older people. Dysfunction of brain endothelial cells is reported to be involved in the pathogenesis of acute ischemic stroke. Ramelteon is a novel agonist of melatonin receptor developed for the treatment of insomnia. Recently, the promising protective effect of Ramelteon on brain injury has been widely reported. The present study aims to investigate the protective effect of Ramelteon against free fatty acid (FFA)-induced damages in brain vascular endothelial cells and the underlying mechanism. Firstly, we discovered that Ramelteon administration remarkably reversed the decreased cell viability, increased LDH release, activated oxidative stress, and excessive released inflammatory factors caused by FFAs. Secondly, Ramelteon extensively suppressed the attachment of U937 monocytes to bEnd.3 brain endothelial cells induced by FFAs. In addition, the elevated expression of E-selectin and the reduced expression of KLF2 induced by FFAs were pronouncedly alleviated by Ramelteon. Lastly, silencing of KLF2 abolished the protective effects of Ramelteon against FFA-induced expression of E-selectin and the attachment of U937 monocytes to bEnd.3 brain endothelial cells. In conclusion, Ramelteon mitigated FFA-induced attachment of monocytes to brain vascular endothelial cells by increasing the expression of KLF2 and reducing the expression of E-selectin.
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Affiliation(s)
- Guijie Wang
- Department of Internal Medicine-Neurology, the Second Affiliated Hospital of Soochow University, Suzhou, 215004, Jiangsu, China
| | - Fang Tian
- Department of General Medicine, Zhuhai People's Hospital, Zhuhai, Guangdong, 519000, China
| | - Yu Li
- Department of Neurosurgery, Zhuhai People's Hospital, Zhuhai, Guangdong, 519000, China
| | - Yang Liu
- Department of Internal Medicine-Neurology, the Fifth Affiliated Hospital of Zunyi Medical University, Zhuhai, 519041, Guangdong, China
| | - Chunfeng Liu
- Department of Internal Medicine-Neurology, the Second Affiliated Hospital of Soochow University, Suzhou, 215004, Jiangsu, China.
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Qin SY, Li B, Chen M, Qin MQ, Liu JM, Lv QL. MiR-32-5p promoted epithelial-to-mesenchymal transition of oral squamous cell carcinoma cells via regulating the KLF2/CXCR4 pathway. Kaohsiung J Med Sci 2021; 38:120-128. [PMID: 34741382 DOI: 10.1002/kjm2.12450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/26/2021] [Accepted: 08/17/2021] [Indexed: 11/07/2022] Open
Abstract
Oral squamous cell carcinoma (OSCC) is one of the most common carcinomas of the oral cavity. However, the regulatory mechanisms on miR-32-5p remain poorly understood in OSCC. The expression of miR-32-5p, Krüppel-like factor 2 (KLF2), C-X-C motif chemokine receptor 4 (CXCR4), and epithelial-to-mesenchymal transition (EMT)-related proteins (E-cadherin, Vimentin, N-cadherin, and Snail) were evaluated were assessed using RT-qPCR and Western blot. 3-(4, 5-Dimethylthiazolyl2)-2, 5-diphenyltetrazolium bromide assay, wound healing assay, and transwell assay were employed to detect cell proliferation, migration, and invasion of OSCC cells. Finally, dual-luciferase reporter assay was performed to verify the binding relationship between KLF2 and miR-32-5p. MiR-32-5p was highly expressed while KLF2 was lowly expressed in OSCC cells, and miR-32-5p knockdown or KLF2 overexpression could markedly reduce cell proliferation, migration, invasion, and EMT of OSCC cells. What is more, KLF2 was the target of miR-32-5p, and knockdown of KLF2 abolished the inhibitory effect of miR-32-5p inhibitor on progression of OSCC. Finally, CXCR4 expression was negatively regulated by KLF2, and inhibition of CXCR4 obviously alleviated the biological effects of si-KLF2 on the progression of OSCC. MiR-32-5p could enhance cell proliferation, migration, invasion, and EMT of OSCC cells, and the discovery of miR-32-5p/KLF2/CXCR4 axis might provide potential therapeutic targets for OSCC.
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Affiliation(s)
- Shi-Yu Qin
- Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guilin Medical University, Guilin, China
| | - Bo Li
- Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guilin Medical University, Guilin, China
| | - Mei Chen
- Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guilin Medical University, Guilin, China
| | - Ming-Qun Qin
- Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guilin Medical University, Guilin, China
| | - Ji-Mu Liu
- Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guilin Medical University, Guilin, China
| | - Qiu-Li Lv
- Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guilin Medical University, Guilin, China
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Retraction: LncRNA SNHG3 enhances the malignant progress of glioma through silencing KLF2 and p21. Biosci Rep 2021; 41:BSR-2018-0420_RET. [PMID: 34647578 DOI: 10.1042/BSR-2018-0420_RET] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Ma C, Wu H, Yang G, Xiang J, Feng K, Zhang J, Hua Y, Kang L, Fan G, Yang S. Calycosin ameliorates atherosclerosis by enhancing autophagy via regulating the interaction between KLF2 and MLKL in apoE -/- mice. Br J Pharmacol 2021; 179:252-269. [PMID: 34713437 DOI: 10.1111/bph.15720] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/23/2021] [Accepted: 10/06/2021] [Indexed: 10/20/2022] Open
Abstract
BACKGROUND AND PURPOSE Atherosclerosis is one of the underlying causes of cardiovascular disease. Formation of foam cells and necrotic core in the plaque is a hallmark of atherosclerosis, which results from lipid deposition, apoptosis, and inflammation in macrophage. Macrophage autophagy is a critical anti-atherogenic process and defective autophagy aggravates atherosclerosis by enhancing foam cell formation, apoptosis, and inflammation. Hence, enhancing autophagy can be a strategy for atherosclerosis treatment. Calycosin, a flavonoid from Astragali Radix, displays antioxidant and anti-inflammatory activities, and therefore is potential to reduce the risk of cardiovascular disease. However, the antiatherogenic effect of calycosin and the involved mechanism remains unclear. In this study, we assessed the potential benefits of calycosin on autophagy and atherosclerosis, and revealed the underlying mechanism. EXPERIMENTAL APPROACH In this study, apoE-/- mice were fed high-fat diet for 16 weeks in presence of calycosin and/or autophagy inhibitor chloroquine, which was followed by determination of atherosclerosis development, autophagy activity, and the involved mechanisms. KEY RESULTS Calycosin protected against atherosclerosis and enhanced plaque stability via promoting autophagy. Calycosin inhibited foam cells formation, inflammation, and apoptosis by enhancing autophagy. MLKL was demonstrated as a new autophagy regulator, which can be negatively regulated by KLF2. Mechanistically, inhibitory effects of calycosin on atherogenesis were via improving autophagy through modulating KLF2-MLKL signaling pathway. CONCLUSIONS AND IMPLICATIONS This study demonstrated the atheroprotective effect of calycosin was through upregulating KLF2-MLKL-mediated autophagy, which not only proposed novel mechanistic insights into the atherogenesis but also identified calycosin as a potential drug candidate for atherosclerosis treatment.
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Affiliation(s)
- Chuanrui Ma
- First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China.,National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion
| | - Han Wu
- Department of Endocrinology, Shenzhen People's Hospital, The Second Clinical Medical College of Jinan University & The First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Guangyan Yang
- Department of Endocrinology, Shenzhen People's Hospital, The Second Clinical Medical College of Jinan University & The First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Jiaqing Xiang
- Department of Endocrinology, Shenzhen People's Hospital, The Second Clinical Medical College of Jinan University & The First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Ke Feng
- College of Life Sciences, Nankai University, Tianjin, China
| | - Jing Zhang
- First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China.,National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion
| | - Yunqing Hua
- First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China.,National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion
| | - Lin Kang
- Department of Endocrinology, Shenzhen People's Hospital, The Second Clinical Medical College of Jinan University & The First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, Guangdong, China.,The Biobank of National Innovation Center for Advanced Medical Devices, Shenzhen People's Hospital, Shenzhen, Guangdong, China
| | - Guanwei Fan
- First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China.,National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion
| | - Shu Yang
- Department of Endocrinology, Shenzhen People's Hospital, The Second Clinical Medical College of Jinan University & The First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, Guangdong, China.,Integrated Chinese and Western Medicine Postdoctoral Research Station, Jinan University, Guangzhou, China
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Liu J, Li Z, Yu G, Wang T, Qu G, Wang Y. LINC01232 Promotes Gastric Cancer Proliferation through Interacting with EZH2 to Inhibit the Transcription of KLF2. J Microbiol Biotechnol 2021; 31:1358-1365. [PMID: 34409953 PMCID: PMC9705925 DOI: 10.4014/jmb.2106.06041] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/10/2021] [Accepted: 08/17/2021] [Indexed: 12/15/2022]
Abstract
To clarify the role of long intergenic nonprotein-coding RNA 1232 (LINC01232) in the progression of gastric cancer and the potential mechanism, we analyzed the expression of LINC01232 in TCGA database using the GEPIA online tool, and the LINC01232 level in gastric cancer cell lines was detected by quantitative real time-polymerase chain reaction (qRT-PCR) as well. Cell proliferation assay, colony formation assay, transwell assay and tumor formation experiment in nude mice were conducted to observe the biological behavior changes of gastric cancer cells through the influence of LINC01232 knockdown. LncATLAS database and subcellular isolation assay were used for subcellular distribution of LINC01232 in gastric cancer cells. The interaction among LINC01232, zeste homolog 2 (EZH2) and kruppel-like factor 2 (KLF2) was clarified by RNA-protein interaction prediction (RPISeq), RNA immunoprecipitation (RIP), qRT-PCR and chromatin immunoprecipitation (ChIP) assay. Rescue experiments were further conducted to elucidate the biological function of LINC01232/KLF2 axis in the progression of gastric cancer. LINC01232 was upregulated in stomach adenocarcinoma (STAD) tissues and gastric cancer lines. LINC01232 knockdown inhibited the proliferative capacities of gastric cancer cells in vitro, and impaired in vivo tumorigenicity. LINC01232 was mainly distributed in the cell nucleus where it epigenetically repressed KLF2 expression via binding to the enhancer of EZH2, which was capable of binding to promoter regions of KLF2 to induce histone H3 lysine 27 trimethylation (H3K27me3). LINC01232 exerts oncogenic activities in gastric cancer via inhibition of KLF2, and therefore, the knockdown of KLF2 could reverse the regulatory effect of LINC01232 in the proliferative ability of gastric cancer cells.
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Affiliation(s)
- Jing Liu
- Department of Pathology, Yantai Yuhuangding Hospital, Yantai 264000, P.R. China
| | - Zhen Li
- Department of General and Pediatric Surgery, Yantai Yuhuangding Hospital, Yantai 264000, P.R. China
| | - Guohua Yu
- Department of Pathology, Yantai Yuhuangding Hospital, Yantai 264000, P.R. China
| | - Ting Wang
- Department of Pathology, Yantai Yuhuangding Hospital, Yantai 264000, P.R. China
| | - Guimei Qu
- Department of Pathology, Yantai Yuhuangding Hospital, Yantai 264000, P.R. China
| | - Yunhui Wang
- Department of General and Pediatric Surgery, Yantai Yuhuangding Hospital, Yantai 264000, P.R. China
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Wittner J, Schuh W. Krüppel-like Factor 2 ( KLF2) in Immune Cell Migration. Vaccines (Basel) 2021; 9:1171. [PMID: 34696279 DOI: 10.3390/vaccines9101171] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 09/27/2021] [Accepted: 10/06/2021] [Indexed: 01/30/2023] Open
Abstract
Krüppel-like factor 2 (KLF2), a transcription factor of the krüppel-like family, is a key regulator of activation, differentiation, and migration processes in various cell types. In this review, we focus on the functional relevance of KLF2 in immune cell migration and homing. We summarize the key functions of KLF2 in the regulation of chemokine receptors and adhesion molecules and discuss the relevance of the KLF2-mediated control of immune cell migration in the context of immune responses, infections, and diseases.
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Li Z, Wang J, Ma Y. Montelukast attenuates interleukin IL-1β-induced oxidative stress and apoptosis in chondrocytes by inhibiting CYSLTR1 (Cysteinyl Leukotriene Receptor 1) and activating KLF2 (Kruppel Like Factor 2). Bioengineered 2021; 12:8476-8484. [PMID: 34565285 PMCID: PMC8806840 DOI: 10.1080/21655979.2021.1984003] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Montelukast is a cysteinyl leukotriene receptor 1 (CysLTR1) antagonist widely used to suppress the inflammatory response in asthma and allergic rhinitis. This study aimed to investigate the potential impacts of montelukast on osteoarthritis (OA) progression. To determine the role of montelukast in OA, the expression of CysLTR1 was first examined by quantitative reverse transcription PCR (RT-qPCR) and western blot in IL-1β-induced ATDC5 cells treated with or without montelukast. Subsequently, the impacts of montelukast on cell viability and oxidative stress were measured by Cell-Counting-Kit-8 (CCK-8), commercial kits and western blot. Oxidative stress-related protein expressions were determined by western blot analysis in Il-1β-induced ATDC5 cells. Cell apoptosis and cartilage degradation were examined by TdT-mediated dUTP Nick-End Labeling (TUNEL) assay, western blot and RT-qPCR. KLF2 expression was measured in IL-1β-induced ATDC5 cells treated with montelukast. After interference with small interfering RNA (siRNA)-KLF2 in ATDC5 cells, the loss-of-function assays were also performed in same ways. CysLTR1 expression was elevated in IL-1β-induced ATDC5 cells but inhibited significantly by montelukast. Montelukast attenuated the oxidative stress and apoptosis, improved cell viability. Moreover, montelukast enhanced KLF2 expression. After transfected with siRNA-KLF2, montelukast attenuated cell injury, oxidative stress, apoptosis and cartilage degradation in IL-1β-induced ATDC5 cells by activating KLF2.In summary, this work elaborates the evidence that montelukast could attenuate oxidative stress and apoptosis in IL-1β-induced chondrocytes by inhibiting CysLTR1 and activating KLF2, which can guide the therapeutic strategies of montelukast for OA development in the future.
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Affiliation(s)
- Zongwei Li
- School of Pharmaceutical Engineering, Guangdong Food and Drug Vocational College, Guangzhou City, Guangdong Province, China
| | - Jianming Wang
- School of Pharmaceutical Engineering, Guangdong Food and Drug Vocational College, Guangzhou City, Guangdong Province, China
| | - Yumin Ma
- Department of Pharmaceutical Machinery, Maternal and Child Health and Family Planning Technical Service Center, Wuwei City, Gansu Province, China
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Thakar S, Katakia YT, Ramakrishnan SK, Pandya Thakkar N, Majumder S. Intermittent High Glucose Elevates Nuclear Localization of EZH2 to Cause H3K27me3-Dependent Repression of KLF2 Leading to Endothelial Inflammation. Cells 2021; 10:2548. [PMID: 34685528 DOI: 10.3390/cells10102548] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/16/2021] [Accepted: 09/25/2021] [Indexed: 02/03/2023] Open
Abstract
Epigenetic mechanisms have emerged as one of the key pathways promoting diabetes-associated complications. Herein, we explored the role of enhancer of zeste homolog 2 (EZH2) and its product histone 3 lysine 27 trimethylation (H3K27me3) in high glucose-mediated endothelial inflammation. To examine this, we treated cultured primary endothelial cells (EC) with different treatment conditions-namely, constant or intermittent or transient high glucose. Intermittent high glucose maximally induced endothelial inflammation by upregulating transcript and/or protein-level expression of ICAM1 and P-selectin and downregulating eNOS, KLF2, and KLF4 protein levels. We next investigated the underlining epigenetic mechanisms responsible for intermittent hyperglycemia-dependent endothelial inflammation. Compared with other high glucose treatment groups, intermittent high glucose-exposed EC exhibited an increased level of H3K27me3 caused by reduction in EZH2 threonine 367 phosphorylation and nuclear retention of EZH2. Intermittent high glucose also promoted polycomb repressive complex-2 (PRC2) assembly and EZH2's recruitment to histone H3. Abrupt enrichment of H3K27me3 on KLF2 and KLF4 gene promoters caused repression of these genes, further supporting endothelial inflammation. In contrast, reducing H3K27me3 through small molecule and/or siRNA-mediated inhibition of EZH2 rescued KLF2 level and inhibited endothelial inflammation in intermittent high glucose-challenged cultured EC and isolated rat aorta. These findings indicate that abrupt chromatin modifications cause high glucose-dependent inflammatory switch of EC.
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Deng H, Min E, Baeyens N, Coon BG, Hu R, Zhuang ZW, Chen M, Huang B, Afolabi T, Zarkada G, Acheampong A, McEntee K, Eichmann A, Liu F, Su B, Simons M, Schwartz MA. Activation of Smad2/3 signaling by low fluid shear stress mediates artery inward remodeling. Proc Natl Acad Sci U S A 2021; 118:e2105339118. [PMID: 34504019 PMCID: PMC8449390 DOI: 10.1073/pnas.2105339118] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/03/2021] [Indexed: 11/18/2022] Open
Abstract
Endothelial cell (EC) sensing of wall fluid shear stress (FSS) from blood flow governs vessel remodeling to maintain FSS at a specific magnitude or set point in healthy vessels. Low FSS triggers inward remodeling to restore normal FSS but the regulatory mechanisms are unknown. In this paper, we describe the signaling network that governs inward artery remodeling. FSS induces Smad2/3 phosphorylation through the type I transforming growth factor (TGF)-β family receptor Alk5 and the transmembrane protein Neuropilin-1, which together increase sensitivity to circulating bone morphogenetic protein (BMP)-9. Smad2/3 nuclear translocation and target gene expression but not phosphorylation are maximal at low FSS and suppressed at physiological high shear. Reducing flow by carotid ligation in rodents increases Smad2/3 nuclear localization, while the resultant inward remodeling is blocked by the EC-specific deletion of Alk5. The flow-activated MEKK3/Klf2 pathway mediates the suppression of Smad2/3 nuclear translocation at high FSS, mainly through the cyclin-dependent kinase (CDK)-2-dependent phosphosphorylation of the Smad linker region. Thus, low FSS activates Smad2/3, while higher FSS blocks nuclear translocation to induce inward artery remodeling, specifically at low FSS. These results are likely relevant to inward remodeling in atherosclerotic vessels, in which Smad2/3 is activated through TGF-β signaling.
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Affiliation(s)
- Hanqiang Deng
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
| | - Elizabeth Min
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
- Department of Cell Biology, Yale School of Medicine, New Haven, CT 06511
| | - Nicolas Baeyens
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511;
- Department of Internal Medicine (Cardiology), Yale School of Medicine, New Haven, CT 06511
- Laboratoire de Physiologie et Pharmacologie, Faculty of Medicine, Université libre de Bruxelles, 1050 Bruxelles, Belgium
| | - Brian G Coon
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
| | - Rui Hu
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
| | - Zhen W Zhuang
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
- Department of Physiology, Yale School of Medicine, New Haven, CT 06511
| | - Minghao Chen
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
| | - Billy Huang
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
| | - Titilayo Afolabi
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
| | - Georgia Zarkada
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
| | - Angela Acheampong
- Laboratoire de Physiologie et Pharmacologie, Faculty of Medicine, Université libre de Bruxelles, 1050 Bruxelles, Belgium
| | - Kathleen McEntee
- Laboratoire de Physiologie et Pharmacologie, Faculty of Medicine, Université libre de Bruxelles, 1050 Bruxelles, Belgium
| | - Anne Eichmann
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
- Department of Internal Medicine (Cardiology), Yale School of Medicine, New Haven, CT 06511
- Department of Physiology, Yale School of Medicine, New Haven, CT 06511
| | - Fang Liu
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901-8554
- Susan Lehman Cullman Laboratory for Cancer Research, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901-8554
- Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901-8554
- Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901-8554
| | - Bing Su
- Shanghai Institute of Immunology, Shanghai Jiao Tong University School of Medicine, Shanghai 200240, China
- Department of Microbiology and Immunology, Shanghai Jiao Tong University School of Medicine, Shanghai 200240, China
- Ministry of Education Key Laboratory of Cell Death and Differentiation, Shanghai Jiao Tong University School of Medicine, Shanghai 200240, China
| | - Michael Simons
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511
- Department of Cell Biology, Yale School of Medicine, New Haven, CT 06511
- Department of Internal Medicine (Cardiology), Yale School of Medicine, New Haven, CT 06511
| | - Martin A Schwartz
- Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511;
- Department of Cell Biology, Yale School of Medicine, New Haven, CT 06511
- Department of Internal Medicine (Cardiology), Yale School of Medicine, New Haven, CT 06511
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520
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Vela V, Juskevicius D, Dirnhofer S, Menter T, Tzankov A. Mutational landscape of marginal zone B-cell lymphomas of various origin: organotypic alterations and diagnostic potential for assignment of organ origin. Virchows Arch 2021. [PMID: 34494161 DOI: 10.1007/s00428-021-03186-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 08/04/2021] [Accepted: 08/11/2021] [Indexed: 02/07/2023]
Abstract
This meta-analysis aims to concisely summarize the genetic landscape of splenic, nodal and extranodal marginal zone lymphomas (MZL) in the dura mater, salivary glands, thyroid, ocular adnexa, lung, stomach and skin with respect to somatic variants. A systematic PubMed search for sequencing studies of MZL was executed. All somatic mutations of the organs mentioned above were combined, uniformly annotated, and a dataset containing 25 publications comprising 6016 variants from 1663 patients was created. In splenic MZL, KLF2 (18%, 103/567) and NOTCH2 (16%, 118/725) were the most frequently mutated genes. Pulmonary and nodal MZL displayed recurrent mutations in chromatin-modifier-encoding genes, especially KMT2D (25%, 13/51, and 20%, 20/98, respectively). In contrast, ocular adnexal, gastric, and dura mater MZL had mutations in genes encoding for NF-κB pathway compounds, in particular TNFAIP3, with 39% (113/293), 15% (8/55), and 45% (5/11), respectively. Cutaneous MZL frequently had FAS mutations (63%, 24/38), while MZL of the thyroid had a higher prevalence for TET2 variants (61%, 11/18). Finally, TBL1XR1 (24%, 14/58) was the most commonly mutated gene in MZL of the salivary glands. Mutations of distinct genes show origin-preferential distribution among nodal and splenic MZL as well as extranodal MZL at/from different anatomic locations. Recognition of such mutational distribution patterns may help assigning MZL origin in difficult cases and possibly pave the way for novel more tailored treatment concepts.
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Li R, Chen J, Gao X, Jiang G. Transcription factor KLF2 enhances the sensitivity of breast cancer cells to cisplatin by suppressing kinase WEE1. Cancer Biol Ther 2021; 22:465-477. [PMID: 34486497 DOI: 10.1080/15384047.2021.1949228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Cisplatin is an effective chemotherapeutic agent in facilitating the inhibition of proliferation, migration, and invasion in cancerous cells. However, the detailed mechanism of the regulation by cisplatin of human breast cancer cells is still unclear. This study aimed to investigate the mechanism of kruppel-like factor 2 (KLF2) transcription factor in cisplatin therapy for breast cancer. RT-qPCR was performed to quantify the expression of KLF2 and WEE1 in clinical tissue samples from breast cancer patients and in MDA-MB-231 cells. ChIP assay and dual-luciferase reporter assay were used to analyze the potential-binding sites of KLF2 and WEE1 promoter. Gain- or loss-of-function approaches were used to manipulate KLF2 and WEE1 in cisplatin-treated MDA-MB-231 cells, and the mechanism of KLF2 in breast cancer was evaluated both via CCK-8 assay, flow cytometry, Transwell assay, and Western blot. Further validation of the KLF2 was performed on nude mouse models. Breast cancer tissues and cells showed a relative decline of KLF2 expression and abundant WEE1 expression. Cisplatin inhibited the proliferation, migration, and invasion of MDA-MB-231 cells. Overexpression of KLF2 enhanced the inhibitory effect of cisplatin on the malignant characteristics of MDA-MB-231 cells in vitro. KLF2 targeted WEE1 and negatively regulated its expression, thus enhancing the sensitivity to cisplatin of breast cancer cells as well as tumor-bearing mice. Overall, these results suggest that KLF2 can potentially inhibit WEE1 expression and sensitize breast cancer cells to cisplatin, thus presenting a promising adjunct treatment.
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Affiliation(s)
- Ruiqing Li
- Department of Throat and Breast Surgery, The Second Affiliated Hospital of Soochow University, Soochow P.R. China
| | - Jiejing Chen
- Department of Throat and Breast Surgery, Affiliated Hospital of Yangzhou University, Yangzhou P.R. China
| | - Xiaokang Gao
- Department of Throat and Breast Surgery, Affiliated Hospital of Yangzhou University, Yangzhou P.R. China
| | - Guoqin Jiang
- Department of Throat and Breast Surgery, The Second Affiliated Hospital of Soochow University, Soochow P.R. China
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Park JS, Lee GH, Jin SW, Pham TH, Thai TN, Kim JY, Kim CY, Han EH, Hwang YP, Choi CY, Jeong HG. G protein-coupled estrogen receptor regulates the KLF2-dependent eNOS expression by activating of Ca 2+ and EGFR signaling pathway in human endothelial cells. Biochem Pharmacol 2021; 192:114721. [PMID: 34363795 DOI: 10.1016/j.bcp.2021.114721] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/30/2021] [Accepted: 08/02/2021] [Indexed: 12/26/2022]
Abstract
G protein-coupled estrogen receptor (GPER) is important for maintaining normal blood vessel function by preventing endothelial cell dysfunction. It has been reported that G-1, an agonist of GPER, increases nitric oxide (NO) production through the phosphorylation of endothelial nitric oxide synthase (eNOS). However, the effect of GPER activation on eNOS expression has not been studied. Our results show that G-1 significantly increased the expression of eNOS and Kruppel-like factor 2 (KLF2) in human endothelial EA.hy926 cells. The individual silences of KLF2 and GPER attenuated G-1-induced eNOS expression. In addition, inhibition of the Gαq and Gβγ suppressed G-1-induced the expression of eNOS and KLF2 in EA.hy926 cells. Interestingly, these effects were similar in HUVECs. Furthermore, we found that GPER-mediated Ca2+ signaling increased the phosphorylation of CaMKKβ, AMPK, and CaMKIIα in the cells. The phosphorylation of histone deacetylase 5 (HDAC5) by activation of AMPK and CaMKIIα increased the expression of eNOS via transcriptional activity of KLF2. We further demonstrate that GPER activation increased the phosphorylation of Src, EGFR, ERK5, and MEF2C and consequently induced the expression of eNOS and KLF2. Meanwhile, inhibition of ERK5 and HDAC5 suppressed the expression of eNOS and KLF2 induced by G-1 in the cells. These findings suggest that GPER provides a novel mechanism for understanding the regulation of eNOS expression and is an essential therapeutic target in preventing cardiovascular-related endothelial dysfunction.
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Affiliation(s)
- Jin Song Park
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Gi Ho Lee
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Sun Woo Jin
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Thi Hoa Pham
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Tuyet Ngan Thai
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Ji Yeon Kim
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Chae Yeon Kim
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Eun Hee Han
- Drug & Disease Target Research Team, Division of Bioconvergence Analysis, Korea Basic Science Institute (KBSI), Cheongju 28119, Republic of Korea
| | - Yong Pil Hwang
- Fisheries Promotion Division, Mokpo City, Mokpo 58613, Republic of Korea
| | - Chul Yung Choi
- Department of Biomedical Science, College of Natural Science, Chosun University, Gwangju 61452, Republic of Korea
| | - Hye Gwang Jeong
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea.
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Abstract
Diabetes mellitus (DM) is a complex metabolic disease with significant neurological complications and is reported to be closely related to the blood-brain barrier (BBB) disruption. Azilsartan is an antagonist of the Angiotensin II receptor developed for the treatment of hypertension, and it has been recently reported to have neuroprotective effects. The present study aims to investigate the protective effect of Azilsartan against hyperglycemia-induced BBB disruption and its underlying mechanism. Male db/db mice were treated with Azilsartan (20 μg/day) for 10 consecutive days. Compared to the control group, increased BBB permeability, suppressed occludin expression, excessive release of inflammatory factors, and downregulation of krüppel-like factor 2 (KLF2) were observed in diabetic mice, all of which were dramatically reversed by Azilsartan treatment. In the in vitro experiments, elevated endothelial permeability and decreased expression of occludin and KLF2 were observed in high glucose-challenged endothelial cells, which were significantly alleviated by Azilsartan. Lastly, the silencing of KLF2 abolished the protective effects of Azilsartan against the high glucose-induced expression of occludin and endothelial monolayer permeability in bEnd.3 brain endothelial cells. Based on these observations, we concluded that Azilsartan protected against hyperglycemia-induced hyperpermeability of BBB via the KLF2/occludin axis.
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Affiliation(s)
- Jing Han
- Department of Neurosurgery, the People's Hospital of China Three Gorges University, Yichang, Hubei, China
| | - Hua Tang
- Department of Neurosurgery, the People's Hospital of China Three Gorges University, Yichang, Hubei, China
| | - Longfei Yao
- Department of Neurosurgery, the People's Hospital of China Three Gorges University, Yichang, Hubei, China
| | - Erliang Jin
- Department of Neurosurgery, the People's Hospital of China Three Gorges University, Yichang, Hubei, China
| | - Wanxi Pan
- Department of Neurosurgery, the People's Hospital of China Three Gorges University, Yichang, Hubei, China
| | - Shaojun Chen
- Department of Neurosurgery, the People's Hospital of China Three Gorges University, Yichang, Hubei, China
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Wang P, Zhao X, Wu X, Tang G, Yuan L. miR-15b-3p promotes the malignant progression of endometrial cancer cells through targeting KLF2. Cell Cycle 2021; 20:1431-1440. [PMID: 34224334 DOI: 10.1080/15384101.2021.1941611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Human endometrial cancer is one of the most common malignant tumors in women with an increased incidence by years. The biological function of miR-15b-3p in endometrial cancer is still unclear. Therefore, this study explores the expression and potential mechanism of miR-15b-3p in endometrial cancer, providing a novel theory basis for targeted therapy. Herein, differentially expressed miRNAs and mRNAs in endometrial cancer were determined by bioinformatics analysis. qRT-PCR measured expression of miRNAs and mRNAs. The protein expression of mRNA in cells was determined by western blot. MTT, wound healing, and Transwell assays evaluated the biological behavior of cells. Dual luciferase assay validated the targeted relationship between target miRNA and mRNA. miR-15b-3p was highly expressed in endometrial cancer, and overexpression of miR-15b-3p promoted the malignant progression of endometrial cancer cells. KLF2 was a downstream target of miR-15b-3p, and overexpression of KLF2 reversed the facilitation of miR-15b-3p on endometrial cancer cells. miR-15b-3p promoted the proliferation, migration, and invasion of endometrial cancer cells by targeting KLF2, which made miR-15b-3p a potential diagnostic factor and new molecular therapeutic target for endometrial cancer.
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Affiliation(s)
- Ping Wang
- Department of Oncology, Tangshan People's Hospital, Tangshan, China
| | - Xiqing Zhao
- Department of Neurosurgery, Tangshan People's Hospital, Tangshan, China
| | - Xiaotang Wu
- Shanghai Engineering Research Center of Pharmaceutical Translation, Shanghai, China
| | - Guoshuai Tang
- Shanghai Engineering Research Center of Pharmaceutical Translation, Shanghai, China
| | - Linna Yuan
- Department of Pathology, Affiliated Hospital of Jiaxing University, Jiaxing, China
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Lin CM, Wang BW, Pan CM, Fang WJ, Chua SK, Cheng WP, Shyu KG. Chrysin boosts KLF2 expression through suppression of endothelial cell-derived exosomal microRNA-92a in the model of atheroprotection. Eur J Nutr 2021. [PMID: 34041583 DOI: 10.1007/s00394-021-02593-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 05/14/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE Atherosclerosis and its related clinical complications are the leading cause of death. MicroRNA (miR)-92a in the inflammatory endothelial dysfunction leads to atherosclerosis. Krüppel-like factor 2 (KLF2) is required for vascular integrity and endothelial function maintenance. Flavonoids possess many biological properties. This study investigated the vascular protective effects of chrysin in balloon-injured carotid arteries. MATERIALS AND METHODS Exosomes were extracted from human coronary artery endothelial cell (HCAEC) culture media. Herb flavonoids and chrysin were the treatments in these atheroprotective models. Western blotting and real-time PCRs were performed. In situ hybridization, immunohistochemistry, and immunofluorescence analyses were employed. RESULTS MiR-92a increased after balloon injury and was present in HCAEC culture media. Chrysin was treated, and significantly attenuated the miR-92a levels after balloon injury, and similar results were obtained in HCAEC cultures in vitro. Balloon injury-induced miR-92a expression, and attenuated KLF2 expression. Chrysin increased the KLF2 but reduced exosomal miR-92a secretion. The addition of chrysin and antagomir-92a, neointimal formation was reduced by 44.8 and 49.0% compared with balloon injury after 14 days, respectively. CONCLUSION Chrysin upregulated KLF2 expression in atheroprotection and attenuated endothelial cell-derived miR-92a-containing exosomes. The suppressive effect of miR-92a suggests that chrysin plays an atheroprotective role. Proposed pathway for human coronary artery endothelial cell (HCAEC)-derived exosomes induced by chrysin to suppress microRNA (miR)-92a expression and counteract the inhibitory effect of miR-92a on KLF2 expression in HCAECs. This provides an outline of the critical role of the herbal flavonoid chrysin, which may serve as a valuable therapeutic supplement for atheroprotection.
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Xue P, Yan M, Wang K, Gu J, Zhong B, Tu C. Up-Regulation of LINC00665 Facilitates the Malignant Progression of Prostate Cancer by Epigenetically Silencing KLF2 Through EZH2 and LSD1. Front Oncol 2021; 11:639060. [PMID: 34094920 PMCID: PMC8173224 DOI: 10.3389/fonc.2021.639060] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 03/22/2021] [Indexed: 12/27/2022] Open
Abstract
This study aimed to explore the function of LINC00665 on the proliferation and metastasis of prostate cancer (PCa), and the potential regulatory mechanisms were also investigated. The expression level of LINC00665 in 50 pairs of PCa tissues and adjacent ones was studied by qRT-PCR, and the associations between LINC00665 and clinicopathological characteristics of PCa patients were analyzed. Control group (sh-NC) and LINC00665 knock-down group (sh-LINC00665) were set in 22RV1 and DU145 cells, respectively. The biological functions of LINC00665 in PCa cell lines were assessed by CCK-8, EdU, Transwell assays, and the nude mouse xenograft model was used to evaluate the tumorigenicity in vivo. In addition, qRT-PCR, Western Blot, RIP and ChIP assays were also used to determine the regulation mechanism of LINC00665 in PCa cell lines. In this study, our results showed that LINC00665 expression level in PCa cancer tissues was significantly up-regulated, compared with that in adjacent ones. Besides, similar results were found in PCa cell lines. Knock-down of LINC00665 significantly attenuated the proliferation and migration ability in 22RV1 and DU145 cells, compared to sh-NC. Mechanically, LINC00665 could interact with EZH2 and LSD1, recruiting them to KLF2 promoter region to inhibit its transcription. Moreover, the tumor-suppressive effects mediated by sh-LINC00665 were significantly reversed through the down-regulation of KLF2. Also, the suppression of LINC00665 impaired tumor growth of PCa in vivo. In summary, LINC00665 exerted the oncogenic functions in PCa cell lines by epigenetically silencing KLF2 expression by binding to EZH2 and LSD1, illuminating a novel mechanism of LINC00665 in the malignant progression of PCa and furnishing a prospective therapeutic biomarker to combat PCa.
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Affiliation(s)
- Peng Xue
- Department of Urology, The First People's Hospital of Lianyungang, Lianyungang Clinical Medical College of Nanjing Medical University, Lianyungang, China
| | - Miao Yan
- Department of Oncology, The First People's Hospital of Lianyungang, Lianyungang Clinical Medical College of Nanjing Medical University, Lianyungang, China
| | - Kunpeng Wang
- Department of Urology, The First People's Hospital of Lianyungang, Lianyungang Clinical Medical College of Nanjing Medical University, Lianyungang, China
| | - Jinbao Gu
- Department of Urology, The First People's Hospital of Lianyungang, Lianyungang Clinical Medical College of Nanjing Medical University, Lianyungang, China
| | - Bing Zhong
- Department of Urology, The Affiliated Huai'an No.1 People's Hospital of Nanjing Medical University, Huai'an, China
| | - Chuanquan Tu
- Department of Urology, The First People's Hospital of Lianyungang, Lianyungang Clinical Medical College of Nanjing Medical University, Lianyungang, China
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