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Sottoriva K, Pajcini KV. Notch Signaling in the Bone Marrow Lymphopoietic Niche. Front Immunol 2021; 12:723055. [PMID: 34394130 PMCID: PMC8355626 DOI: 10.3389/fimmu.2021.723055] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 07/14/2021] [Indexed: 12/12/2022] Open
Abstract
Lifelong mammalian hematopoiesis requires continuous generation of mature blood cells that originate from Hematopoietic Stem and Progenitor Cells (HSPCs) situated in the post-natal Bone Marrow (BM). The BM microenvironment is inherently complex and extensive studies have been devoted to identifying the niche that maintains HSPC homeostasis and supports hematopoietic potential. The Notch signaling pathway is required for the emergence of the definitive Hematopoietic Stem Cell (HSC) during embryonic development, but its role in BM HSC homeostasis is convoluted. Recent work has begun to explore novel roles for the Notch signaling pathway in downstream progenitor populations. In this review, we will focus an important role for Notch signaling in the establishment of a T cell primed sub-population of Common Lymphoid Progenitors (CLPs). Given that its activation mechanism relies primarily on cell-to-cell contact, Notch signaling is an ideal means to investigate and define a novel BM lymphopoietic niche. We will discuss how new genetic model systems indicate a pre-thymic, BM-specific role for Notch activation in early T cell development and what this means to the paradigm of lymphoid lineage commitment. Lastly, we will examine how leukemic T-cell acute lymphoblastic leukemia (T-ALL) blasts take advantage of Notch and downstream lymphoid signals in the pathological BM niche.
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Affiliation(s)
- Kilian Sottoriva
- Department of Pharmacology and Regenerative Medicine, University of Illinois at Chicago College of Medicine, Chicago, IL, United States
| | - Kostandin V Pajcini
- Department of Pharmacology and Regenerative Medicine, University of Illinois at Chicago College of Medicine, Chicago, IL, United States
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Hu G, Ma J, Zhang J, Chen Y, Liu H, Huang Y, Zheng J, Xu Y, Xue W, Zhai W. Hypoxia-induced lncHILAR promotes renal cancer cell invasion and metastasis via ceRNA for the miR-613/206/1-1-3p/Jagged-1/Notch/CXCR4 signaling pathway. Mol Ther 2021; 29:2979-2994. [PMID: 34058384 DOI: 10.1016/j.ymthe.2021.05.020] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 03/05/2021] [Accepted: 05/19/2021] [Indexed: 12/24/2022] Open
Abstract
Hypoxia has been identified as a common driving factor that contributes to tumor progression, including invasion and metastasis. However, the underlying mechanisms of enhanced invasion and metastasis under hypoxia remain unclear. A hypoxic microenvironment promoted invasion and metastasis of RCC by upregulating the expression of LOC100506178, which we named Hypoxia-Induced lncRNA Associated with Renal Cell Carcinoma (lncHILAR). Knockdown of lncHILAR inhibited cell invasion and migration while overexpression of lncHILAR conversely facilitated cell invasion and migration of RCC cells. Notably, hypoxic RCC cells secreted exosomes packaged with lncHILAR which were taken up by normoxic RCC cells and then drove normoxic cell invasion. Mechanistically, hypoxia-induced-lncHILAR elevated RCC invasion and metastasis by acting as a competing endogenous (ce)RNA for miR-613/206/1-1-3p, which led to the upregulation of Jagged-1 and C-X-C Motif Chemokine Receptor 4 (CXCR4). Activation of the of Jagged-1/Notch/CXCR4 axis induced RCC metastasis. Hypoxia-induced lncHILAR promotes RCC cell invasion and metastasis via ceRNA for the miR-613/206/1-1-3p/Jagged-1/Notch/CXCR4 axis. The novel lncHILAR may thus serve as a potential biomarker and therapeutic target in RCC.
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Affiliation(s)
- Guanghui Hu
- State Key Laboratory of Oncogenes and Related Genes, Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Junjie Ma
- Department of Urology, Shanghai General Hospital, School of Medicine in Shanghai Jiao Tong University, Shanghai, 200080, China
| | - Jin Zhang
- State Key Laboratory of Oncogenes and Related Genes, Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Yonghui Chen
- State Key Laboratory of Oncogenes and Related Genes, Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Huan Liu
- Department of Urology, Shanghai Tenth People's Hospital, School of Medicine in Tongji University, Shanghai, 200072, China
| | - Yiran Huang
- State Key Laboratory of Oncogenes and Related Genes, Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China
| | - Junhua Zheng
- Department of Urology, Shanghai General Hospital, School of Medicine in Shanghai Jiao Tong University, Shanghai, 200080, China
| | - Yunfei Xu
- Department of Urology, Shanghai Tenth People's Hospital, School of Medicine in Tongji University, Shanghai, 200072, China.
| | - Wei Xue
- State Key Laboratory of Oncogenes and Related Genes, Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
| | - Wei Zhai
- State Key Laboratory of Oncogenes and Related Genes, Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
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Dergilev KV, Zubkova ЕS, Beloglazova IB, Menshikov МY, Parfyonova ЕV. Notch signal pathway - therapeutic target for regulation of reparative processes in the heart. TERAPEVT ARKH 2018; 90:112-121. [PMID: 30701843 DOI: 10.26442/00403660.2018.12.000014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Notch signaling pathway is a universal regulator of cell fate in embryogenesis and in maintaining the cell homeostasis of adult tissue. Through local cell-cell interactions, he controls neighboring cells behavior and determines their capacity for self-renewal, growth, survival, differentiation, and apoptosis. Recent studies have shown that the control of regenerative processes in the heart is also carried out with the participation of Notch system. At the heart of Notch regulates migration bone marrow progenitors and stimulates the proliferation of cardiomyocytes, cardiac progenitor cell activity, limits cardiomyocyte hypertrophy and fibrosis progression and stimulates angiogenesis. Notch signaling pathway may be regarded as a very promising target for the development of drugs for the stimulation of regeneration in the myocardium.
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Affiliation(s)
- K V Dergilev
- National Medical Research Center for Cardiology of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - Е S Zubkova
- National Medical Research Center for Cardiology of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - I B Beloglazova
- National Medical Research Center for Cardiology of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - М Yu Menshikov
- National Medical Research Center for Cardiology of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - Е V Parfyonova
- National Medical Research Center for Cardiology of the Ministry of Health of the Russian Federation, Moscow, Russia.,M.V. Lomonosov Moscow State University, Moscow, Russia
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Nucleic acids and analogs for bone regeneration. Bone Res 2018; 6:37. [PMID: 30603226 PMCID: PMC6306486 DOI: 10.1038/s41413-018-0042-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 11/19/2018] [Accepted: 11/26/2018] [Indexed: 02/07/2023] Open
Abstract
With the incidence of different bone diseases increasing, effective therapies are needed that coordinate a combination of various technologies and biological materials. Bone tissue engineering has also been considered as a promising strategy to repair various bone defects. Therefore, different biological materials that can promote stem cell proliferation, migration, and osteoblastic differentiation to accelerate bone tissue regeneration and repair have also become the focus of research in multiple fields. Stem cell therapy, biomaterial scaffolds, and biological growth factors have shown potential for bone tissue engineering; however, off-target effects and cytotoxicity have limited their clinical use. The application of nucleic acids (deoxyribonucleic acid or ribonucleic acid) and nucleic acid analogs (peptide nucleic acids or locked nucleic acids), which are designed based on foreign genes or with special structures, can be taken up by target cells to exert different effects such as modulating protein expression, replacing a missing gene, or targeting specific gens or proteins. Due to some drawbacks, nucleic acids and nucleic acid analogs are combined with various delivery systems to exert enhanced effects, but current studies of these molecules have not yet satisfied clinical requirements. In-depth studies of nucleic acid or nucleic acid analog delivery systems have been performed, with a particular focus on bone tissue regeneration and repair. In this review, we mainly introduce delivery systems for nucleic acids and nucleic acid analogs and their applications in bone repair and regeneration. At the same time, the application of conventional scaffold materials for the delivery of nucleic acids and nucleic acid analogs is also discussed. Used with an appropriate delivery system, nucleic acids and nucleic acid analogs have excellent potential for bone repair and regeneration. Owing to various challenges with bone tissue regeneration, current research is largely focused on gene therapy, which employs genes to treat or prevent disease, and such new materials as nucleic acids (DNA and RNA) and nucleic acid analogs (compounds structurally similar to naturally occurring nucleic acids). A team headed by Yunfeng Lin at Sichuan University, China conducted a review of delivery systems for nucleic acids and nucleic acid analogs and their application in bone repair and regeneration. The authors identified the use of biomaterial scaffolds (which mimic living tissue) as one of the most important research areas for gene therapy, and that strategy has proven effective with all types of bone regeneration and repair.
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Deregulation of Notch1 pathway and circulating endothelial progenitor cell (EPC) number in patients with bicuspid aortic valve with and without ascending aorta aneurysm. Sci Rep 2018; 8:13834. [PMID: 30218064 PMCID: PMC6138685 DOI: 10.1038/s41598-018-32170-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 08/30/2018] [Indexed: 12/29/2022] Open
Abstract
Bicuspid aortic valve (BAV) is frequently associated with the development of ascending aortic aneurysm, even if the underlying mechanisms remain to be clarified. Here, we investigated if a deregulation of Notch1 signaling pathway and endothelial progenitor cells (EPCs) number is associated with BAV disease and an early ascending aortic aneurysm (AAA) onset. For this purpose, 70 subjects with BAV (M/F 50/20; mean age: 58.8 ± 14.8 years) and 70 subjects with tricuspid aortic valve (TAV) (M/F 35/35; mean age: 69.1 ± 12.8 years) and AAA complicated or not, were included. Interestingly, patients with AAA showed a significant increase in circulating Notch1 levels and EPC number than subjects without AAA. However, circulating Notch1 levels and EPC number were significantly lower in BAV subjects than TAV patients either in the presence or absence of AAA. Finally, Notch pathway was activated to a greater extent in aortic aneurysmatic portions with respect to healthy aortic fragments in both BAV and TAV patients. However, the expression of genes encoding components and ligands of Notch pathway in aortic tissues was significantly lower in BAV than TAV subjects. Our study demonstrates that BAV subjects are characterized by a significant decrease in both tissue and circulating levels of Notch pathway, and in blood EPC number than TAV patients, either in presence or absence of AAA disease.
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The role of the Notch signaling pathway in liver injury and repair. JOURNAL OF BIO-X RESEARCH 2018. [DOI: 10.1097/jbr.0000000000000014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Zhou M, Liu NX, Shi SR, Li Y, Zhang Q, Ma QQ, Tian TR, Ma WJ, Cai XX, Lin YF. Effect of tetrahedral DNA nanostructures on proliferation and osteo/odontogenic differentiation of dental pulp stem cells via activation of the notch signaling pathway. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2018; 14:1227-1236. [PMID: 29458214 DOI: 10.1016/j.nano.2018.02.004] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 01/23/2018] [Accepted: 02/08/2018] [Indexed: 02/05/2023]
Abstract
Dental pulp stem cells (DPSCs) derived from the human dental pulp tissue have multiple differentiation capabilities, such as osteo/odontogenic differentiation. Therefore, DPSCs are deemed as ideal stem cell sources for tissue regeneration. As new nanomaterials based on DNA, tetrahedral DNA nanostructures (TDNs) have tremendous potential for biomedical applications. Here, the authors aimed to explore the part played by TDNs in proliferation and osteo/odontogenic differentiation of DPSCs, and attempted to investigate if these cellular responses could be driven by activating the canonical Notch signaling pathway. Upon exposure to TDNs, proliferation and osteo/odontogenic differentiation of DPSCs were dramatically enhanced, accompanied by up regulation of Notch signaling. In general, our study suggested that TDNs can significantly promote proliferation and osteo/odontogenic differentiation of DPSCs, and this remarkable discovery can be applied in tissue engineering and regenerative medicine to develop a significant and novel method for bone and dental tissue regeneration.
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Affiliation(s)
- Mi Zhou
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Nan-Xin Liu
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Si-Rong Shi
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yong Li
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Southwest Medical University, Luzhou, China
| | - Qi Zhang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Quan-Quan Ma
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Tao-Ran Tian
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Wen-Juan Ma
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xiao-Xiao Cai
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yun-Feng Lin
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
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Cheng Y, Gu W, Zhang G, Li X, Guo X. Activation of Notch1 signaling alleviates dysfunction of bone marrow-derived mesenchymal stem cells induced by cigarette smoke extract. Int J Chron Obstruct Pulmon Dis 2017; 12:3133-3147. [PMID: 29138545 PMCID: PMC5667796 DOI: 10.2147/copd.s146201] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Bone marrow-derived mesenchymal stem cells (BM-MSCs) are considered attractive therapeutic agents for the treatment of COPD. However, little is known about the impact of Notch on the proliferation, migration, and survival of MSCs in a cigarette smoke (CS) microenvironment. Here, we used CS extract to mimic the CS microenvironment in vitro, with the intention to investigate the effect of Notch in regulating proliferation, migration, and survival of BM-MSCs. Rat bone marrow mesenchymal stem cells were infected with lentivirus vector containing the intracellular domain of Notch1 (N1ICD) and challenged with CS extract. Cell proliferation was detected by Ki67 staining and expression of cell cycle-related proteins. A transwell assay was used to measure cell migration and the expression of apoptotic proteins was examined. The proliferation of BM-MSCs overexpressing N1ICD significantly increased. Consistently, levels of cyclin D1, p-Rb, and E2F-1 increased in N1ICD overexpressing cells. N1ICD overexpression also increased cell migration compared with the control group. N1ICD overexpression equilibrated the expression of Bax and Bcl-2, and blocked caspase-3 cleavage, contributing to the inhibition of apoptosis. Moreover, blockade of the PI3K/Akt pathway suppressed the aforementioned cytoprotective effects of N1ICD. In conclusion, activation of Notch signaling improved proliferation, migration, and survival of BM-MSCs in a CS microenvironment partly through the PI3K/Akt pathway.
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Affiliation(s)
- Yi Cheng
- Department of Respiratory Medicine, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wen Gu
- Department of Respiratory Medicine, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Guorui Zhang
- Department of Respiratory Medicine, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaoming Li
- Department of Respiratory Medicine, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xuejun Guo
- Department of Respiratory Medicine, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Zhang Q, Deng S, Sun K, Lin S, Lin Y, Zhu B, Cai X. MMP-2 and Notch signal pathway regulate migration of adipose-derived stem cells and chondrocytes in co-culture systems. Cell Prolif 2017; 50. [PMID: 28925018 DOI: 10.1111/cpr.12385] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Accepted: 08/15/2017] [Indexed: 02/05/2023] Open
Abstract
OBJECTIVES The crosstalk between chondrocytes and adipose-derived stem cells (ADSCs) could regulate the secretion of multiple growth factors. However, it is not clear how the paracrine action in co-culture systems affect cell migration. This study focused on the changes of cell migration of ADSCs and chondrocytes in co-culture conditions. MATERIALS AND METHODS Primary ADSCs and chondrocytes were isolated from Sprague-Dawley rat. Transwell co-culture systems, inoculated with ADSCs and chondrocytes, were established in vitro. The morphology of the cells was observed 7 days post-seeding by inverted phase-contrast microscope. Additionally, the cytoskeleton changes were investigated by immunofluorescence staining. To detect the abundance of Vinculin, we used immunofluorescence and Western blotting. Additionally, the expression level of MMP-2, Hey1 and Hes1 was examined to determine the mechanisms of co-culture-induced cell migration changes. RESULTS The migration of ADSCs and chondrocytes in co-culture conditions significantly decreased compared with that in mono-culture groups, accompanied by the decrease of filopodia and the expression level of MMP-2. CONCLUSIONS The overall study showed that the migration of ADSCs and chondrocytes differs significantly depending on culture conditions. Moreover, the Notch signalling pathway may be involved in this process. Accordingly, by studying changes in migration caused by co-culture, we obtained new insight into the crosstalk between ADSCs and chondrocytes.
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Affiliation(s)
- Qi Zhang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Shuwen Deng
- Department of Stomatology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Ke Sun
- Department of Stomatology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Shiyu Lin
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Yunfeng Lin
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Bofeng Zhu
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Shanxi, China.,Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Shanxi, China
| | - Xiaoxiao Cai
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
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Cong Z, Wu H, Guo Z, Qin T, Xu Y, Jing H, Wang Y, Shen Y. High expression of C-X-C chemokine receptor 4 and Notch1 is predictive of lymphovascular invasion and poor prognosis in lung adenocarcinoma. Tumour Biol 2017; 39:1010428317708698. [PMID: 28618922 DOI: 10.1177/1010428317708698] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Zhuangzhuang Cong
- Department of Cardiothoracic Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Haiwei Wu
- Department of Cardiothoracic Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Zhong Guo
- Department of Cardiothoracic Surgery, Jinling Hospital, School of Medicine, Southern Medical University, Guangzhou, China
| | - Tao Qin
- Department of Cardiothoracic Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Yang Xu
- Department of Cardiothoracic Surgery, Jinling Hospital, Nanjing Medical University, Nanjing, China
| | - Hua Jing
- Department of Cardiothoracic Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Yanqing Wang
- Department of Cardiology, The 81st Hospital of PLA, Nanjing, China
| | - Yi Shen
- Department of Cardiothoracic Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
- Department of Cardiothoracic Surgery, Jinling Hospital, School of Medicine, Southern Medical University, Guangzhou, China
- Department of Cardiothoracic Surgery, Jinling Hospital, Nanjing Medical University, Nanjing, China
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Lu H, Mei H, Wang F, Zhao Q, Wang S, Liu L, Cheng L. Decreased phosphorylation of PDGFR-β impairs the angiogenic potential of expanded endothelial progenitor cells via the inhibition of PI3K/Akt signaling. Int J Mol Med 2017; 39:1492-1504. [PMID: 28487975 PMCID: PMC5428960 DOI: 10.3892/ijmm.2017.2976] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 04/21/2017] [Indexed: 11/06/2022] Open
Abstract
Human umbilical cord blood-derived endothelial progenitor cells (EPCs) have been proven to contribute to post-natal angiogenesis, and have been applied in various models of ischemia. However, to date, to the best of our knowledge, there is no available data on the angiogenic properties of EPCs during the process of in vitro expansion. In this study, we expanded EPCs to obtain cells at different passages, and analyzed their cellular properties and angiogenic ability. In the process of expansion, no changes were observed in cell cobblestone-like morphology, apoptotic rate and telomere length. However, the cell proliferative ability was significantly decreased. Additionally, the expression of CD144, CD90 and KDR was significantly downregulated in the later-passage cells. Vascular formation assay in vitro revealed that EPCs at passage 4 and 6 formed more integrated and organized capillary-like networks. In a murine model of hind limb ischemia, the transplantation of EPCs at passage 4 and 6 more effectively promoted perfusion recovery in the limbs on days 7 and 14, and promoted limb salvage and histological recovery. Furthermore, the phosphorylation levels of platelet‑derived growth factor receptor-β (PDGFR-β) were found to be significantly decreased with the in vitro expansion process, accompanied by the decreased activation of the PI3K/Akt signaling pathway. When PDGFR inhibitor was used to treat the EPCs, the differences in the angiogenic potential and migratory ability among the EPCs at different passages were no longer observed; no significant differences were also observed in the levels of phosphorylated PI3K/Akt between the EPCs at different passages following treatment with the inhibitor. On the whole, our findings indicate that the levels of phosphorylated PDGFR-β are decreased in EPCs with the in vitro expansion process, which impairs their angiogenic potential by inhibiting PI3K/Akt signaling. Our findings may aid in the more effective selection of EPCs of different passages for the clinical therapy of ischemic disease.
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Affiliation(s)
- Haiyuan Lu
- Institute of Reproduction and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, Hunan 410078, P.R. China
| | - Hua Mei
- National Center of Human Stem Cell Research and Engineering, Changsha, Hunan 410000, P.R. China
| | - Fan Wang
- National Center of Human Stem Cell Research and Engineering, Changsha, Hunan 410000, P.R. China
| | - Qian Zhao
- Institute of Reproduction and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, Hunan 410078, P.R. China
| | - Siqi Wang
- National Center of Human Stem Cell Research and Engineering, Changsha, Hunan 410000, P.R. China
| | - Lvjun Liu
- Institute of Reproduction and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, Hunan 410078, P.R. China
| | - Lamei Cheng
- Institute of Reproduction and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, Hunan 410078, P.R. China
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Wang H, Xia Y, Fu S, Wang W, Xie C, Zhang Y, Gong F. Notch4 Signaling Pathway of Endothelial Progenitor Cells in a Kawasaki Disease Model Induced by Lactobacillus casei Cell Wall Extract. J Vasc Res 2016; 53:340-348. [PMID: 28013300 DOI: 10.1159/000449061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 08/04/2016] [Indexed: 11/19/2022] Open
Abstract
The Notch4 signaling pathway of endothelial progenitor cells (EPCs) may play a crucial role in Kawasaki disease (KD). We investigated the proliferation, adhesion, migration, angiogenesis, and expression levels of Notch4, recombination signal-binding protein-Jκ (RBP-Jκ), P-selectin, and vascular cell adhesion molecule-1 (VCAM-1) of bone marrow (BM) EPCs in a KD model induced by Lactobacillus casei cell wall extract. The numbers of BM EPCs decreased significantly in the KD models. The Notch4 expression level on the EPC surface was higher in the KD models than in the controls. The proliferative, adhesive, migratory, and angiogenic properties, and double immunofluorescence-binding rate of BM EPCs were significantly impaired in the KD models. The levels of Notch4 and P-selectin mRNA were lower in the KD models than in the controls on day 3. The RBP-Jκ mRNA levels were lower in the KD models than in the controls on days 3 and 7. The levels of RBP-Jκ and vascular endothelial growth factor receptor-2 proteins decreased in the early stage. In conclusion, the BM EPC functions and bioactivities in the KD models were impaired, and the Notch4 signaling pathway is associated with KD.
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Affiliation(s)
- Huafeng Wang
- The Children's Hospital of Zhejiang University School of Medicine, Hangzhou, PR China
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Tian DM, Liang YM, Zhang YQ. Endothelium-targeted human Delta-like 1 enhances the regeneration and homing of human cord blood stem and progenitor cells. J Transl Med 2016; 14:5. [PMID: 26740017 PMCID: PMC4704259 DOI: 10.1186/s12967-015-0761-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 12/26/2015] [Indexed: 02/07/2023] Open
Abstract
Background Umbilical cord blood (UCB) is becoming an alternative cell source for hematopoietic stem cell transplantation (HSCT). However, umbilical cord blood transplantation (UCBT) has been severely limited by low and finite numbers of hematopoietic stem cells and their delayed engraftment. New strategies are needed to improve ex vivo expansion efficiency and in vivo haematopoietic recovery. Methods We produced an endothelium-targeted soluble Notch ligand, the Delta-Serrate-Lag-2 (DSL) domain of human Delta-like 1 fused with a RGD motif (hD1R), and tested the effects of this protein on human umbilical cord blood hematopoietic stem and progenitor cell (UCB-HSPC) ex vivo and in vivo. Results hD1R-mediated ex vivo expansion system was able to significantly increase the absolute number of UCB-HSPCs. The hD1R-expanded cells had the enhanced homing and maintained long-term hematopoietic stem cell repopulation capacity in the bone marrow of immunodeficient nonobese diabetic-severe combined immunodeficient (NOD/SCID) mice. Moreover, systemic administration of hD1R promoted the in vivo regeneration of donor cells in recipient mice and accelerated hematopoietic recovery, particularly in settings wherein the HSPCs dose was limiting. Conclusions Our results indicated that hD1R might be applied in improving hematopoietic recovery and HSC engraftment in human UCBT. Electronic supplementary material The online version of this article (doi:10.1186/s12967-015-0761-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Deng-Mei Tian
- Department of Hematology, 309th Hospital, Chinese People's Liberation Army, Hei-san hu Street #17, 100091, Beijing, China.
| | - Ying-Min Liang
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, China.
| | - Yong-Qing Zhang
- Department of Hematology, 309th Hospital, Chinese People's Liberation Army, Hei-san hu Street #17, 100091, Beijing, China.
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Sun Y, Zhu D, Wang G, Wang D, Zhou H, Liu X, Jiang M, Liao L, Zhou Z, Hu J. Pro-Inflammatory Cytokine IL-1β Up-Regulates CXC Chemokine Receptor 4 via Notch and ERK Signaling Pathways in Tongue Squamous Cell Carcinoma. PLoS One 2015; 10:e0132677. [PMID: 26176534 PMCID: PMC4503771 DOI: 10.1371/journal.pone.0132677] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 06/18/2015] [Indexed: 12/12/2022] Open
Abstract
Chronic inflammation contributes to tumor development through the induction of oncogenic mutations, genomic instability, early tumor promotion, and enhanced angiogenesis. Here, we report that IL-1 receptor 1 (IL-1R1) was expressed in 40 of 41 human tongue squamous cell carcinomas (TSCC). IL-1β up-regulated the expression of CXCR4, a CXC chemokine receptor that mediates cancer growth and metastasis, at both mRNA and protein levels in Tca8113 TSCC cells. IL-1β treatment of Tca8113 cells promoted migration in response to CXCR4 ligand stromal-derived factor α (SDF-1α). The inhibition of IL-1R1 by its antagonist IL-1Ra or RNA interference significantly reversed the up-regulation of CXCR4 induced by IL-1β. IL-1R1 activation also up-regulated the expression of IL-1β itself, suggesting a positive feedback regulation of CXCR4 expression. Furthermore, IL-1β induced the activation of Notch, which was originally considered a stem cell regulator. Pharmacological inhibition of Notch signaling reversed the up-regulation of CXCR4 induced by IL-1β, suggesting that Notch signaling may be involved in the growth and metastasis of cancers via up-regulation of CXCR4. In addition, IL-1β induced the activation of extracellular signal regulated kinase (ERK) and ERK inhibition decreased the up-regulation of CXCR4 induced by IL-1β, suggesting the involvement of ERK signaling in cancer metastasis. Taken together these data suggest that IL-1β and IL-1R1 promote cancer growth and metastasis by up-regulating CXCR4 expression and that CXCR4 may be a link between inflammation and cancer.
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Affiliation(s)
- Yi Sun
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, China
- Medical Research Center, Changsha Central Hospital, Changsha, China
| | - Demao Zhu
- Department of Pathology, Changsha Central Hospital, Changsha, China
| | - Guihua Wang
- Department of Oncology, Changsha Central Hospital, Changsha, China
| | - Di Wang
- Department of Oncology, Changsha Central Hospital, Changsha, China
| | - Huashan Zhou
- Department of Pathology, Changsha Central Hospital, Changsha, China
| | - Xueting Liu
- Medical Research Center, Changsha Central Hospital, Changsha, China
| | - Manli Jiang
- Medical Research Center, Changsha Central Hospital, Changsha, China
| | - Lingjuan Liao
- Medical Research Center, Changsha Central Hospital, Changsha, China
| | - Zhiguang Zhou
- Institute of Metabolism and Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, China
- * E-mail: (ZZ); (JH)
| | - Jinyue Hu
- Medical Research Center, Changsha Central Hospital, Changsha, China
- * E-mail: (ZZ); (JH)
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15
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Oxidative stress tolerance of early stage diabetic endothelial progenitor cell. Regen Ther 2015; 1:38-44. [PMID: 31245440 PMCID: PMC6581786 DOI: 10.1016/j.reth.2014.11.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 11/01/2014] [Accepted: 11/05/2014] [Indexed: 12/23/2022] Open
Abstract
Introduction One of the causes for poor vasculogenesis of diabetes mellitus (DM) is known to rise from the dysfunction of bone marrow-derived endothelial progenitor cells (BM EPCs). However, the origin of its cause is less understood. We aimed to investigate the effect of oxidative stress in early stage of diabetic BM-EPC and whether its vasculogenic dysfunction is caused by oxidative stress. Methods Bone marrow c-Kit+Sca-1+Lin− (BM-KSL) cells were sorted from control and streptozotocin-induced diabetic C57BL6J mice by flow cytometry. BM-KSLs were then assessed for vasculogenic potential (colony forming assay; EPC-CFA), accumulation of intracellular ROS (CM-H2DCFDA), carbonylated protein (ELISA), anti-oxidative enzymes expression (RT-qPCR) and catalase activity (Amplex Red). Results Compared to control, DM BM-KSL had significantly lower EPC-CFUs in both definitive EPC-CFU and total EPC-CFU (p < 0.05). Interestingly, the oxidative stress level of DM BM-KSL was comparable and was not significantly different to control followed by increased in anti-oxidative enzymes expression and catalase activity. Conclusions Primitive BM-EPCs showed vasculogenic dysfunction in early diabetes. However the oxidative stress is not denoted as the major initiating factor of its cause. Our results suggest that primitive BM-KSL cell has the ability to compensate oxidative stress levels in early diabetes by increasing the expression of anti-oxidative enzymes. Primitive BM-EPC showed EPC-CFU dysfunction in early diabetes. Primitive BM-EPC has the ability to withstand oxidative stress in early diabetes. Early diabetic BM-EPC increased anti-oxidative expression to compensate oxidative stress.
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16
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Rizzo P, Mele D, Caliceti C, Pannella M, Fortini C, Clementz AG, Morelli MB, Aquila G, Ameri P, Ferrari R. The role of notch in the cardiovascular system: potential adverse effects of investigational notch inhibitors. Front Oncol 2015; 4:384. [PMID: 25629006 PMCID: PMC4292456 DOI: 10.3389/fonc.2014.00384] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 12/22/2014] [Indexed: 12/17/2022] Open
Abstract
Targeting the Notch pathway is a new promising therapeutic approach for cancer patients. Inhibition of Notch is effective in the oncology setting because it causes a reduction of highly proliferative tumor cells and it inhibits survival of cancer stem cells, which are considered responsible for tumor recurrence and metastasis. Additionally, since Delta-like ligand 4 (Dll4)-activated Notch signaling is a major modulator of angiogenesis, anti-Dll4 agents are being investigated to reduce vascularization of the tumor. Notch plays a major role in the heart during the development and, after birth, in response to cardiac damage. Therefore, agents used to inhibit Notch in the tumors (gamma secretase inhibitors and anti-Dll4 agents) could potentially affect myocardial repair. The past experience with trastuzumab and other tyrosine kinase inhibitors used for cancer therapy demonstrates that the possible cardiotoxicity of agents targeting shared pathways between cancer and heart and the vasculature should be considered. To date, Notch inhibition in cancer patients has resulted only in mild gastrointestinal toxicity. Little is known about the potential long-term cardiotoxicity associated to Notch inhibition in cancer patients. In this review, we will focus on mechanisms through which inhibition of Notch signaling could lead to cardiomyocytes and endothelial dysfunctions. These adverse effects could contrast with the benefits of therapeutic responses in cancer cells during times of increased cardiac stress and/or in the presence of cardiovascular risk factor.
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Affiliation(s)
- Paola Rizzo
- Department of Medical Sciences, University of Ferrara , Ferrara , Italy ; Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara , Ferrara , Italy ; GVM Hospitals , Cotignola , Italy
| | - Donato Mele
- Azienda Ospedaliero-Universitaria di Ferrara , Cona , Italy
| | | | - Micaela Pannella
- Department of Medical Sciences, University of Ferrara , Ferrara , Italy
| | - Cinzia Fortini
- Department of Medical Sciences, University of Ferrara , Ferrara , Italy
| | | | | | - Giorgio Aquila
- Department of Medical Sciences, University of Ferrara , Ferrara , Italy
| | - Pietro Ameri
- Research Center of Cardiovascular Biology, Department of Internal Medicine, University of Genova , Genova , Italy
| | - Roberto Ferrari
- Department of Medical Sciences, University of Ferrara , Ferrara , Italy ; Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara , Ferrara , Italy ; Azienda Ospedaliero-Universitaria di Ferrara , Cona , Italy
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17
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Gao Y, Wang Q, Cui X, Liu Y, Zheng T, Chen C, Sun C, Huang S, Wang X, Liu Y, Jiang X, Zeng C, Quan D. Controlled release of stromal cell-derived factor-1α from silk fibroin-coated coils accelerates intra-aneurysmal organization and occlusion of neck remnant by recruiting endothelial progenitor cells. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2014; 7:8366-8380. [PMID: 25674201 PMCID: PMC4314014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 11/24/2014] [Indexed: 06/04/2023]
Abstract
This study is to test the efficacy of stromal cell-derived factor-1α (SDF-1α)-coated coils together with endothelial progenitor cells (EPCs) transplantation in occluding aneurysms. Bone marrow-derived EPC surface markers were analyzed using flow cytometry. The migratory function of EPCs in response to SDF-1α was evaluated using a modified Boyden chamber assay. Capillary-like tube formation was assessed using Matrigel gel. Coil morphologies before and after coating with SDF-1α were observed under a scanning electron microscope. The level of SDF-1α in supernatants was measured by ELISA. Sprague-Dawley rats were randomly allocated into five groups. Histological analysis was performed on days 14 and 28 after coil implantation. The bone marrow-EPCs could express CD133, CD34, and VEGFR-2 and form tubule-like structures in vitro. Migratory ability of EPCs in the presence of SDF-1α-coated coils was similar to that in the presence of 5 ng/ml SDF-1α gradient. Sustained release of SDF-1α was achieved using silk fibroin as a carrier. In SDF-1α-coated coils + EPCs transplantation group, a well-organized fibrous tissue bridging the orifice of aneurysms was shown on days 14 and 28. On day 28, tissue organization was greater in the SDF-1α-coated coils group than in the unmodified coils group. Immunofluorescence showed α-smooth muscle actin-positive cells in organized tissue in sacs. Combined treatment with SDF-1α-coated coils and EPCs transplantation is a safe and effective treatment for rat aneurysms. This may provide a new strategy for endovascular therapy following aneurysmal subarachnoid hemorrhage.
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Affiliation(s)
- Yuyuan Gao
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Qiujing Wang
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Xubo Cui
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Yaqi Liu
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Tao Zheng
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Chengwei Chen
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Chengmei Sun
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Shuyun Huang
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Xin Wang
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Yanchao Liu
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Xiaodan Jiang
- Department of Neurosurgery, Zhujiang Hospital, The National Key Clinic Specialty, The Neurosurgery Institute of Guangdong Province, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Southern Medical UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Chi Zeng
- Scholl of Chemistry and Chemical Engineering, Sun Yat-Sen UniversityGuangzhou City, Guangdong Province, P.R. China
| | - Daping Quan
- Scholl of Chemistry and Chemical Engineering, Sun Yat-Sen UniversityGuangzhou City, Guangdong Province, P.R. China
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18
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Fan H, Ma L, Fan B, Wu J, Yang Z, Wang L. Role of PDGFR-β/PI3K/AKT signaling pathway in PDGF-BB induced myocardial fibrosis in rats. Am J Transl Res 2014; 6:714-723. [PMID: 25628782 PMCID: PMC4297339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 10/15/2014] [Indexed: 06/04/2023]
Abstract
OBJECTIVE To investigate the role of PDGFR-β/PI3K/AKT signaling pathway in the myocardial fibrosis. METHODS CFs were divided into following 4 groups: control group (CON), PDGF-BB group (P), PDGF-BB+IMA group (IMA), and PDGF-BB+LY294002 (LY). RESULTS Immunofluorescence staining showed about 90% of cells were positive for vimentin and 10% for α-SMA. After incubation for 7 days, fluorescence microscopy revealed more than 90% of cells were positive for α-SMA, which was significantly higher than that in CON group (P < 0.01), but markedly lower than that in IMA group and LY group (P < 0.01). The mRNA and protein expression of PDGFR-β, Col I, Col III, PI3K and Akt increased dramatically at 48 h after PDGF-BB treatment when compared with CON group (P < 0.01). However, IMA and LY294002 significantly inhibited the expression of PDGFR-β and p-PI3K (P < 0.05). In addition, the mRNA expression of PDGFR-β, PI3K and Akt in IMA group and LY group was also markedly lower than those in P group (P < 0.01), and the mRNA and protein expression of Col I and Col III reduced remarkably when compared with P group (P < 0.01). Of note, the mRNA expression of PDGFR-α was comparable among 4 groups, and PDGFR-β expression after PDGF-BB treatment increased significantly when compared with PDGFR-α expression (P < 0.01). CONCLUSION PDGF-BB may induce CF proliferation and their transformation into myofibroblasts, which leads to increased synthesis of collagen, resulting in myocardial fibrosis. This is closely associated with PDGFR-β, but not PDGFR-α. PDGFR-β/PI3K/Akt signaling pathway is involved in the PDGF-BB induced myocardial fibrosis.
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Affiliation(s)
- Hai Fan
- Department of Cardiology, Anhui Provincial Hospital Affiliated to Anhui Medical University Hefei 230001, China
| | - Likun Ma
- Department of Cardiology, Anhui Provincial Hospital Affiliated to Anhui Medical University Hefei 230001, China
| | - Bin Fan
- Department of Cardiology, Anhui Provincial Hospital Affiliated to Anhui Medical University Hefei 230001, China
| | - Jiawei Wu
- Department of Cardiology, Anhui Provincial Hospital Affiliated to Anhui Medical University Hefei 230001, China
| | - Zhe Yang
- Department of Cardiology, Anhui Provincial Hospital Affiliated to Anhui Medical University Hefei 230001, China
| | - Lei Wang
- Department of Cardiology, Anhui Provincial Hospital Affiliated to Anhui Medical University Hefei 230001, China
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19
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Brenner C, Kränkel N, Kühlenthal S, Israel L, Remm F, Fischer C, Herbach N, Speer T, Grabmaier U, Laskowski A, Gross L, Theiss H, Wanke R, Landmesser U, Franz WM. Short-term inhibition of DPP-4 enhances endothelial regeneration after acute arterial injury via enhanced recruitment of circulating progenitor cells. Int J Cardiol 2014; 177:266-75. [PMID: 25499391 DOI: 10.1016/j.ijcard.2014.09.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2014] [Revised: 08/06/2014] [Accepted: 09/15/2014] [Indexed: 01/12/2023]
Abstract
BACKGROUND Endothelial injuries regularly occur in atherosclerosis and during interventional therapies of the arterial occlusive disease. Disturbances in the endothelial integrity can lead to insufficient blood supply and bear the risk of thrombus formation and acute vascular occlusion. At present, effective therapeutics to restore endothelial integrity are barely available. We analyzed the effect of pharmacological DPP-4-inhibition by Sitagliptin on endogenous progenitor cell-based endothelial regeneration via the SDF-1α/CXCR4-axis after acute endothelial damage in a mouse model of carotid injury. METHODS AND RESULTS Induction of a defined endothelial injury was performed in the carotid artery of C57Bl/6 mice which led to a local upregulation of SDF-1α expression. Animals were treated with placebo, Sitagliptin or Sitagliptin+AMD3100. Using mass spectrometry we could prove that Sitagliptin prevented cleavage of the chemokine SDF-1α. Accordingly, increased SDF-1α concentrations enhanced recruitment of systemically applied and endogenous circulating CXCR4+ progenitor cells to the site of vascular injury followed by a significantly accelerated reendothelialization as compared to placebo-treated animals. Improved endothelial recovery, as well as recruitment of circulating CXCR4+ progenitor cells (CD133+, Flk1+), was reversed by CXCR4-antagonization through AMD3100. In addition, short-term Sitagliptin treatment did not significantly promote neointimal or medial hyperplasia. CONCLUSION Sitagliptin can accelerate endothelial regeneration after acute endothelial injury. DPP-4 inhibitors prevent degradation of the chemokine SDF-1α and thus improve the recruitment of regenerative circulating CXCR4+ progenitor cells which mediate local endothelial cell proliferation without adversely affecting vessel wall architecture.
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Affiliation(s)
- Christoph Brenner
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany; Institute of Physiology, Cardiovascular Research, University of Zurich, Campus Irchel, Zurich, Switzerland; Department of Internal Medicine III, Medical University Innsbruck, Innsbruck, Austria.
| | - Nicolle Kränkel
- Department of Cardiology, University Hospital Zurich, Zurich, Switzerland; Institute of Physiology, Cardiovascular Research, University of Zurich, Campus Irchel, Zurich, Switzerland
| | - Sarah Kühlenthal
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany
| | - Lars Israel
- Institute of Molecular Biology, Adolf-Butenandt-Institute, Ludwig-Maximilians-University, Munich, Germany
| | - Friederike Remm
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany
| | - Cornelia Fischer
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany
| | - Nadja Herbach
- Institute of Veterinary Pathology, Ludwig-Maximilians-University, Munich, Germany
| | - Timo Speer
- Institute of Physiology, Cardiovascular Research, University of Zurich, Campus Irchel, Zurich, Switzerland; Department of Internal Medicine IV, Saarland University Hospital, Homburg/Saar, Germany
| | - Ulrich Grabmaier
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany
| | - Alexandra Laskowski
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany
| | - Lisa Gross
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany
| | - Hans Theiss
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany
| | - Rüdiger Wanke
- Institute of Veterinary Pathology, Ludwig-Maximilians-University, Munich, Germany
| | - Ulf Landmesser
- Department of Cardiology, University Hospital Zurich, Zurich, Switzerland; Institute of Physiology, Cardiovascular Research, University of Zurich, Campus Irchel, Zurich, Switzerland
| | - Wolfgang-Michael Franz
- Department of Internal Medicine I, Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany; Department of Internal Medicine III, Medical University Innsbruck, Innsbruck, Austria.
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20
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Zhang P, Yan X, Chen Y, Yang Z, Han H. Notch signaling in blood vessels: from morphogenesis to homeostasis. SCIENCE CHINA-LIFE SCIENCES 2014; 57:774-80. [PMID: 25104449 DOI: 10.1007/s11427-014-4716-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 06/16/2013] [Indexed: 12/28/2022]
Abstract
Notch signaling is an evolutionarily conserved intercellular signaling pathway that plays numerous crucial roles in vascular development and physiology. Compelling evidence indicates that Notch signaling is vital for vascular morphogenesis including arterial and venous differentiation and endothelial tip and stalk cell specification during sprouting angiogenesis and also vessel maturation featured by mural cell differentiation and recruitment. Notch signaling is also required for vascular homeostasis in adults by keeping quiescent phalanx cells from re-entering cell cycle and by modulating the behavior of endothelial progenitor cells. We will summarize recent advances of Notch pathway in vascular biology with special emphasis on the underlying molecular mechanisms.
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Affiliation(s)
- Ping Zhang
- Department of Medical Genetics and Developmental Biology, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
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21
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Xie J, Wang W, Si JW, Miao XY, Li JC, Wang YC, Wang ZR, Ma J, Zhao XC, Li Z, Yi H, Han H. Notch signaling regulates CXCR4 expression and the migration of mesenchymal stem cells. Cell Immunol 2013; 281:68-75. [PMID: 23474530 DOI: 10.1016/j.cellimm.2013.02.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 12/04/2012] [Accepted: 02/01/2013] [Indexed: 12/13/2022]
Abstract
Mesenchymal stem cells (MSCs) have been used to repair injured tissues through immune-suppression and/or cell replace mechanisms. However, a significant barrier to MSC therapy is insufficient MSC engraftment in injured tissues after systemic administration. Here, we report that cell surface, total protein, and mRNA levels of CXCR4 were significantly increased in MSCs when Notch signaling was interrupted by γ-secretase inhibitor (GSI) or knockout of the transcription factor RBP-J, which mediates signaling from all four mammalian Notch receptors. The GSI-treated or RBP-J deficient MSCs showed stronger migration toward stromal cell-derived factor-1α (SDF-1α) than that of the control. In a mouse hepatic ischemia/reperfusion model, RBP-J deficient MSCs migrated into the injured liver tissues at a significantly higher efficiency than that of the control MSCs. Mice transfused with RBP-J deficient MSCs showed reduced liver damage. Therefore, Notch signaling regulates MSC migration and function, at least partially via the modulation of CXCR4 expression.
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Affiliation(s)
- Juan Xie
- Department of Traditional Chinese Medicine, Xijing Hospital, Fourth Military University, Xi'an 710032, China
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Mirandola L, Apicella L, Colombo M, Yu Y, Berta DG, Platonova N, Lazzari E, Lancellotti M, Bulfamante G, Cobos E, Chiriva-Internati M, Chiaramonte R. Anti-Notch treatment prevents multiple myeloma cells localization to the bone marrow via the chemokine system CXCR4/SDF-1. Leukemia 2013; 27:1558-66. [PMID: 23354012 DOI: 10.1038/leu.2013.27] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 01/14/2013] [Accepted: 01/17/2013] [Indexed: 01/10/2023]
Abstract
Multiple myeloma (MM) is a deadly hematopoietic malignancy characterized by proliferation of malignant plasma cells in the bone marrow (BM) and bone disease. Interactions between myeloma and BM cells facilitate tumor progression and resistance to therapies. CXCR4 and its ligand Stromal cell-derived factor-1 (SDF-1) have a primary role in this process and are associated with poor prognosis. The Notch pathway is active in myeloma cells, resulting in increased proliferation, resistance to apoptosis and osteolytic activity. We hypothesized that the CXCR4/SDF-1 axis mediates the effects of Notch signals in myeloma cells. Here we show that Notch positively controls CXCR4/SDF-1 expression and functions in myeloma cell lines, and that forced CXCR4 activation partially rescues tumor cells from the outcomes of Notch inhibition. Additionally, we provide evidences that Notch blocking in vivo significantly reduces BM infiltration by human myeloma cells in mouse xenografts. This is the first evidence that a Notch-targeted approach effectively prevents MM cell migration, proliferation and resistance to apoptosis by reducing CXCR4 and SDF-1 levels.
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Affiliation(s)
- L Mirandola
- Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
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Notch-directed microenvironment reprogramming in myeloma: a single path to multiple outcomes. Leukemia 2013; 27:1009-18. [PMID: 23307030 DOI: 10.1038/leu.2013.6] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Multiple myeloma is a deadly hematopoietic malignancy. Despite therapeutic advances such as autologous stem cell transplantation and novel chemotherapeutics, multiple myeloma remains incurable. Multiple myeloma cell localization in the bone marrow and the cross-talk with the bone niche trigger dramatic alterations in the bone marrow microenvironment critical for tumor progression, resistance to therapies and osteolytic bone destruction. It does not surprise that the molecular bases of such fatal interaction are under examination as source of novel potential pharmacological targets. Among these, the Notch family of receptors and ligands has gained growing interest in the recent years because of their early deregulation in multiple myeloma and their ability to affect multiple features of the disease, including tumor cell growth, drug resistance, angiogenesis and bone lesions. This review will explore the evidences of Notch deregulation in multiple myeloma, the state of the art of the currently known roles of its signaling in the fatal interaction between multiple myeloma cells, extracellular matrix and cells in the bone marrow stroma. Finally, we will present recent findings concerning the arguments for or against a therapy addressed to Notch signaling inhibition in the cure of multiple myeloma.
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Qiao L, Xie L, Shi K, Zhou T, Hua Y, Liu H. Notch signaling change in pulmonary vascular remodeling in rats with pulmonary hypertension and its implication for therapeutic intervention. PLoS One 2012; 7:e51514. [PMID: 23251561 PMCID: PMC3520790 DOI: 10.1371/journal.pone.0051514] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Accepted: 11/01/2012] [Indexed: 11/23/2022] Open
Abstract
Pulmonary hypertension (PH) is a fatal disease that lacks an effective therapy. Notch signaling pathway plays a crucial role in the angiogenesis and vascular remodeling. However, its roles in vascular remodeling in PH have not been well studied. In the current study, using hypoxia-induced PH model in rat, we examined the expression of Notch and its downstream factors. Then, we used vessel strip culture system and γ-secretase inhibitor DAPT, a Notch signaling inhibitor to determine the effect of Notch signaling in vascular remodeling and its potential therapeutic value. Our results indicated that Notch 1–4 were detected in the lung tissue with variable levels in different cell types such as smooth muscle cells and endothelial cells of pulmonary artery, bronchia, and alveoli. In addition, following the PH induction, all of Notch1, Notch3, Notch4 receptor, and downstream factor, HERP1 in pulmonary arteries, mRNA expressions were increased with a peak at 1–2 weeks. Furthermore, the vessel wall thickness from rats with hypoxia treatment increased after cultured for 8 days, which could be decreased approximately 30% by DAPT, accompanied with significant increase of expression level of apoptotic factors (caspase-3 and Bax) and transformation of vascular smooth muscle cell (VSMC) phenotype from synthetic towards contractile. In conclusion, the current study suggested Notch pathway plays an important role in pulmonary vascular remodeling in PH and targeting Notch signaling pathway could be a valuable approach to design new therapy for PH.
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MESH Headings
- Animals
- Apoptosis/drug effects
- Blood Vessels/drug effects
- Blood Vessels/pathology
- Blood Vessels/physiopathology
- Cell Proliferation/drug effects
- Cells, Cultured
- Dipeptides/pharmacology
- Disease Models, Animal
- Gene Expression Regulation/drug effects
- Hypertension, Pulmonary/complications
- Hypertension, Pulmonary/metabolism
- Hypertension, Pulmonary/physiopathology
- Hypertension, Pulmonary/therapy
- Hypoxia/complications
- Hypoxia/metabolism
- Hypoxia/physiopathology
- Immunohistochemistry
- In Vitro Techniques
- Lung/blood supply
- Lung/metabolism
- Lung/pathology
- Lung/physiopathology
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Phenotype
- Rats
- Rats, Wistar
- Receptors, Notch/genetics
- Receptors, Notch/metabolism
- Reproducibility of Results
- Signal Transduction/drug effects
- Staining and Labeling
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Affiliation(s)
- Lina Qiao
- Department of Pediatric Cardiology, West China Second University Hospital, Sichuan University, Chengdu, China.
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25
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Chen JY, Feng L, Zhang HL, Li JC, Yang XW, Cao XL, Liu L, Qin HY, Liang YM, Han H. Differential regulation of bone marrow-derived endothelial progenitor cells and endothelial outgrowth cells by the Notch signaling pathway. PLoS One 2012; 7:e43643. [PMID: 23118846 PMCID: PMC3485270 DOI: 10.1371/journal.pone.0043643] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2012] [Accepted: 07/23/2012] [Indexed: 12/14/2022] Open
Abstract
Endothelial progenitor cells (EPCs) are heterogeneous populations of cells that participate in vasculogenesis and promote tissue regeneration. However the different roles of EPC populations in vasculogenesis and tissue regeneration, as well as their regulation and mechanisms remain elusive. In the present study, we cultured bone marrow (BM)-derived early EPCs (EEPCs) and endothelial outgrowth cells (EOCs), and investigated their roles in liver regeneration and their regulation by the Notch signaling pathway. We found that Notch signaling exhibited different effects on the proliferation and migration of EEPCs and EOCs. Our results also showed that while EEPCs failed to form vessel-like structures in a three dimensional sprouting model in vitro, EOCs could sprout and form endothelial cords, and this was regulated by the Notch signaling. We further showed that, by using a conditional knockout model of RBP-J (the critical transcription factor mediating Notch signaling), Notch signaling differentially regulates EEPCs and EOCs. In a partial hepatectomy (PHx) model, EEPCs Notch-dependently benefitted liver regeneration with respect to liver function and hepatocyte proliferation and apoptosis. In contrast, EOCs appeared not directly involved in the recovery of liver function and the increase of hepatocytes. These data suggested that the RBP-J-mediated Notch signaling differentially regulated the two types of EPCs, which showed different roles in liver regeneration.
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Affiliation(s)
- Jing-Yuan Chen
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Lei Feng
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Hai-Long Zhang
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Jun-Chang Li
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Xin-Wei Yang
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Xiu-Li Cao
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Li Liu
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Hong-Yan Qin
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Ying-Min Liang
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
- * E-mail: (Y-ML); (HH)
| | - Hua Han
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
- * E-mail: (Y-ML); (HH)
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26
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Rizzo P, Miele L, Ferrari R. The Notch pathway: a crossroad between the life and death of the endothelium. Eur Heart J 2012; 34:2504-9. [PMID: 22645188 DOI: 10.1093/eurheartj/ehs141] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- Paola Rizzo
- Department of Cardiology and LTTA Centre, University Hospital of Ferrara, Ferrara, Italy
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27
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Gu JW, Rizzo P, Pannuti A, Golde T, Osborne B, Miele L. Notch signals in the endothelium and cancer "stem-like" cells: opportunities for cancer therapy. Vasc Cell 2012; 4:7. [PMID: 22487493 PMCID: PMC3348040 DOI: 10.1186/2045-824x-4-7] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 04/09/2012] [Indexed: 12/14/2022] Open
Abstract
Anti-angiogenesis agents and the identification of cancer stem-like cells (CSC) are opening new avenues for targeted cancer therapy. Recent evidence indicates that angiogenesis regulatory pathways and developmental pathways that control CSC fate are intimately connected, and that endothelial cells are a key component of the CSC niche. Numerous anti-angiogenic therapies developed so far target the VEGF pathway. However, VEGF-targeted therapy is hindered by clinical resistance and side effects, and new approaches are needed. One such approach may be direct targeting of tumor endothelial cell fate determination. Interfering with tumor endothelial cells growth and survival could inhibit not only angiogenesis but also the self-replication of CSC, which relies on signals from surrounding endothelial cells in the tumor microenvironment. The Notch pathway is central to controlling cell fate both during angiogenesis and in CSC from several tumors. A number of investigational Notch inhibitors are being developed. Understanding how Notch interacts with other factors that control endothelial cell functions and angiogenesis in cancers could pave the way to innovative therapeutic strategies that simultaneously target angiogenesis and CSC.
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Affiliation(s)
- Jian-Wei Gu
- University of Mississippi Cancer Institute, Jackson, MS, USA.
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28
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Dou GR, Wang L, Wang YS, Han H. Notch signaling in ocular vasculature development and diseases. Mol Med 2012; 18:47-55. [PMID: 21989947 PMCID: PMC3269647 DOI: 10.2119/molmed.2011.00256] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Accepted: 10/04/2011] [Indexed: 01/10/2023] Open
Abstract
Ocular angiogenesis, characterized by the formation of new blood vessels in the avascular area in eyes, is a highly coordinated process involved in retinal vasculature formation and several ocular diseases such as age-related macular degeneration, proliferative diabetic retinopathy and retinopathy of prematurity. This process is orchestrated by complicated cellular interactions and vascular growth factors, during which endothelial cells acquire heterogeneous phenotypes and distinct cellular destinations. To date, while the vascular endothelial growth factor has been identified as the most critical angiogenic agent with a remarkable therapeutic value, the Notch signaling pathway appears to be a similarly important regulator in several angiogenic steps. Recent progress has highlighted the involvement, mechanisms and therapeutic potential of Notch signaling in retinal vasculature development and pathological angiogenesis-related eye disorders, which may cause irreversible blindness.
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Affiliation(s)
- Guo-Rui Dou
- Department of Ophthalmology, Xijing Hospital, Xi’an, China
- Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi’an, China
| | - Lin Wang
- Department of Hepatic Surgery, Xijing Hospital, Xi’an, China
- Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi’an, China
| | - Yu-Sheng Wang
- Department of Ophthalmology, Xijing Hospital, Xi’an, China
| | - Hua Han
- Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi’an, China
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29
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Li Y, Hiroi Y, Ngoy S, Okamoto R, Noma K, Wang CY, Wang HW, Zhou Q, Radtke F, Liao R, Liao JK. Notch1 in bone marrow-derived cells mediates cardiac repair after myocardial infarction. Circulation 2011; 123:866-76. [PMID: 21321153 DOI: 10.1161/circulationaha.110.947531] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND The signaling mechanisms that regulate the recruitment of bone marrow (BM)-derived cells to the injured heart are not well known. Notch receptors mediate binary cell fate determination and may regulate the function of BM-derived cells. However, it is not known whether Notch1 signaling in BM-derived cells mediates cardiac repair after myocardial injury. METHODS AND RESULTS Mice with postnatal cardiac-specific deletion of Notch1 exhibit infarct size and heart function after ischemic injury that is similar to that of control mice. However, mice with global hemizygous deletion of Notch1 (N1(±)) developed larger infarct size and worsening heart function. When the BM of N1(±) mice were transplanted into wild-type (WT) mice, infarct size and heart function were worsened and neovascularization in the infarct border area was reduced compared with WT mice transplanted with WT BM. In contrast, transplantation of WT BM into N1(±) mice lessened the myocardial injury observed in N1(±) mice. Indeed, hemizygous deletion of Notch1 in BM-derived cells leads to decreased recruitment, proliferation, and survival of mesenchymal stem cells (MSC). Compared with WT MSC, injection of N1(±) MSC into the infarcted heart leads to increased myocardial injury whereas injection of MSC overexpressing Notch intracellular domain leads to decreased infarct size and improved cardiac function. CONCLUSIONS These findings indicate that Notch1 signaling in BM-derived cells is critical for cardiac repair and suggest that strategies that increase Notch1 signaling in BM-derived MSC could have therapeutic benefits in patients with ischemic heart disease.
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Affiliation(s)
- Yuxin Li
- Brigham and Women's Hospital, Cambridge, MA 02139, USA
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30
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Abstract
RBP-J/Su(H)/Lag1, the main transcriptional mediator of Notch signaling, binds DNA with the consensus sequence YRTGDGAD. Notch target genes can be controlled by two opposing activities of RBP-J. The interaction of the Notch intracellular domain with RBP-J induces a weak transcriptional activation and requires an additional tissue-specific transcriptional activator such as bHLH proteins or GATA to mediate strong target gene expression. For example, during Drosophila sensory organ precursor (SOP) cell development, proneural bHLH interacts with Da, a Drosophila orthologue of E2A, to form a tissue-specific activator of Su(H), the Drosophila orthologue of RBP-J. This complex and Su(H) act synergistically to promote the epidermal cell fate. In contrast, a complex of Su(H) with Hairless, a Drosophila functional homologue of MINT, has transcriptional repression activity that promotes SOP differentiation to neurons. Recent conditional loss-of-function studies demonstrated that transcriptional networks involving RBP-J, MINT, and E2A are conserved in mammalian cell differentiation, including multiple steps of lymphocyte development, and probably also in neuronal maturation in adult neurogenesis. During neurogenesis, Notch-RBP-J signaling was thought historically to be involved mainly in the maintenance of undifferentiated neural progenitors. However, the identification of a tissue-specific transcriptional activator of RBP-J-Notch has revealed new roles of RBP-J in the promotion of neuronal maturation. Finally, the Notch-independent function of RBP-J was recently discovered and will be reviewed here.
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