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Becker J, Qiu D, Baron W, Wilting J. Immunofluorescence studies on the expression of the SARS-CoV-2 receptors in human term placenta. Cells Tissues Organs 2021; 212:138-146. [PMID: 34915475 PMCID: PMC9148884 DOI: 10.1159/000521436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 11/28/2021] [Indexed: 11/29/2022] Open
Abstract
Until September 2021, the Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2; COVID-19) pandemic caused over 217 million infections and over 4.5 million deaths. In pregnant women, the risk factors for the need of intensive care treatment are generally the same as in the overall population. Of note, COVID-19-positive women deliver earlier than COVID-19-negative women, and the risk for severe neonatal and perinatal morbidity and mortality is significantly higher. The probability and pathways of vertical transmission of the virus from the pregnant woman to the fetus are highly controversial. Recent data have shown that 54 (13%) of 416 neonates born to COVID-19-positive women were infected. Here, we investigated term placentas collected before the SARS-CoV-2 pandemic and studied the main COVID-19 receptors angiotensin-converting enzyme 2 (ACE2), transmembrane protease serine subtype 2 (TMPRSS2), as well as neuropilin 1 (NRP1). We performed real-time PCR and immunofluorescence on cryosections in combination with markers for syncytiotrophoblast, endothelial cells, macrophages and stromal cells. The PCR studies showed expression of both the truncated delta form of ACE2, which does not bind the COVID-19 spike protein, and the long form. The ACE2 antibody used does not distinguish between the two forms. We did not observe expression of the canonical SARS-CoV-2 entry machinery on syncytio- and cytotrophoblast. ACE2 and TMPRSS2 are co-expressed in a subpopulation of stromal cells, which in part are CD68-positive macrophages. NRP1 is localized to endothelial cells. In sum, the term placenta is not an organ that directly favors vertical transmission of COVID-19; however, microtraumas and placentitis may weaken its barrier function.
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Affiliation(s)
- Jürgen Becker
- Department of Anatomy and Cell Biology, University Medical School Göttingen, Göttingen, Germany
| | - Danny Qiu
- Department of Anatomy and Cell Biology, University Medical School Göttingen, Göttingen, Germany
| | - Walter Baron
- Department of Gynecology, Agaplesion Hospital Neu Bethlehem, Göttingen, Germany
| | - Jörg Wilting
- Department of Anatomy and Cell Biology, University Medical School Göttingen, Göttingen, Germany
- *Jörg Wilting,
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2
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Gkikas D, Stellas D, Polissidis A, Manolakou T, Kokotou MG, Kokotos G, Politis PK. Nuclear receptor NR5A2 negatively regulates cell proliferation and tumor growth in nervous system malignancies. Proc Natl Acad Sci U S A 2021; 118:e2015243118. [PMID: 34561301 PMCID: PMC8488649 DOI: 10.1073/pnas.2015243118] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2021] [Indexed: 01/03/2023] Open
Abstract
Nervous system malignancies are characterized by rapid progression and poor survival rates. These clinical observations underscore the need for novel therapeutic insights and pharmacological targets. To this end, here, we identify the orphan nuclear receptor NR5A2/LRH1 as a negative regulator of cancer cell proliferation and promising pharmacological target for nervous system-related tumors. In particular, clinical data from publicly available databases suggest that high expression levels of NR5A2 are associated with favorable prognosis in patients with glioblastoma and neuroblastoma tumors. Consistently, we experimentally show that NR5A2 is sufficient to strongly suppress proliferation of both human and mouse glioblastoma and neuroblastoma cells without inducing apoptosis. Moreover, short hairpin RNA-mediated knockdown of the basal expression levels of NR5A2 in glioblastoma cells promotes their cell cycle progression. The antiproliferative effect of NR5A2 is mediated by the transcriptional induction of negative regulators of the cell cycle, CDKN1A (encoding for p21cip1), CDKN1B (encoding for p27kip1) and Prox1 Interestingly, two well-established agonists of NR5A2, dilauroyl phosphatidylcholine (DLPC) and diundecanoyl phosphatidylcholine, are able to mimic the antiproliferative action of NR5A2 in human glioblastoma cells via the induction of the same critical genes. Most importantly, treatment with DLPC inhibits glioblastoma tumor growth in vivo in heterotopic and orthotopic xenograft mouse models. These data indicate a tumor suppressor role of NR5A2 in the nervous system and render this nuclear receptor a potential pharmacological target for the treatment of nervous tissue-related tumors.
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Affiliation(s)
- Dimitrios Gkikas
- Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 115 27, Athens, Greece
- Department of Biology, University of Patras, 265 04, Patras, Greece
| | - Dimitris Stellas
- Institute of Chemical Biology, National Hellenic Research Foundation, 116 35, Athens, Greece
| | - Alexia Polissidis
- Centre for Clinical, Experimental Surgery and Translational Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece
| | - Theodora Manolakou
- Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 115 27, Athens, Greece
| | - Maroula G Kokotou
- Center of Excellence for Drug Design and Discovery, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15771, Greece
| | - George Kokotos
- Center of Excellence for Drug Design and Discovery, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15771, Greece
| | - Panagiotis K Politis
- Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 115 27, Athens, Greece;
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3
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Hao X, Luo W, Qiu X. The association of transcription factor Prox1 with the proliferation, migration, and invasion of lung cancer. Open Life Sci 2021; 16:602-610. [PMID: 34183992 PMCID: PMC8218550 DOI: 10.1515/biol-2021-0056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 03/10/2021] [Accepted: 03/11/2021] [Indexed: 12/15/2022] Open
Abstract
Background The current study investigates the effect of transcription factor Prox1 on the proliferation, migration, and invasion ability of lung cancer. Methods Lung cancer cell lines (A549 and H446 cells) were transfected with Prox1NAD and siRNA, respectively. Thus, the A549 and H446 cells overexpressed Prox1 after transfection of Prox1NAD plasmids, and A549 and H446 cells have low expression of Prox1 after transfection with siRNA. Reverse transcriptase quantitative PCR and western blot analyses were used to detect Prox1 mRNA and protein expression in cells. Plate clone formation experiments and MTT experiments were used to detect cell proliferation. Western blot was used to detect the expression of Rho family-related proteins in cells. Results Compared to untransfected wild-type A549 and H446 that served as blank controls, the expression level of Prox1mRNA and protein in A549 and H446 cells overexpressing Prox1 after plasmid transfection was high, while the expression level of Prox1mRNA and protein in A549 and H446 cells with low expression of Prox1 after siRNA transfection was low. With the increase of Prox1 expression, the expression of RhoA and RhoC increased, while the expression of RhoB decreased. Conclusion The finding of this study may provide a new approach for the treatment of lung cancer using targeted gene therapy.
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Affiliation(s)
- Xinxin Hao
- Department of Pathology, The First Affiliated Hospital and College of Basic Medical Sciences, China Medical University, Shenyang 110001, China.,Department of Blood Transfusion, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Wenting Luo
- Key Laboratory of Health Ministry for Congenital Malformation, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Xueshan Qiu
- Department of Pathology, The First Affiliated Hospital and College of Basic Medical Sciences, China Medical University, Shenyang 110001, China
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Rudzińska M, Grzanka M, Stachurska A, Mikula M, Paczkowska K, Stępień T, Paziewska A, Ostrowski J, Czarnocka B. Molecular Signature of Prospero Homeobox 1 (PROX1) in Follicular Thyroid Carcinoma Cells. Int J Mol Sci 2019; 20:ijms20092212. [PMID: 31060342 PMCID: PMC6539481 DOI: 10.3390/ijms20092212] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 04/24/2019] [Accepted: 04/28/2019] [Indexed: 01/15/2023] Open
Abstract
The prospero homeobox 1 (PROX1) transcription factor is a product of one of the lymphangiogenesis master genes. It has also been suggested to play a role in carcinogenesis, although its precise role in tumour development and metastasis remains unclear. The aim of this study was to gain more knowledge on the PROX1 function in thyroid tumorigenesis. Follicular thyroid cancer-derived cells—CGTH-W-1—were transfected with PROX1-siRNA (small interfering RNA) and their proliferation, cell cycle, apoptosis and motility were then analysed. The transcriptional signature of PROX1 depletion was determined using RNA-Sequencing (RNA-Seq) and the expression of relevant genes was further validated using reverse transcriptase quantitative PCR (RT-qPCR), Western blot and immunocytochemistry. PROX1 depletion resulted in a decreased cell motility, with both migratory and invasive potential being significantly reduced. The cell morphology was also affected, while the other studied cancer-related cell characteristics were not significantly altered. RNA-seq analysis revealed significant changes in the expression of transcripts encoding genes involved in both motility and cytoskeleton organization. Our transcriptional analysis of PROX1-depleted follicular thyroid carcinoma cells followed by functional and phenotypical analyses provide, for the first time, evidence that PROX1 plays an important role in the metastasis of thyroid cancer cells by regulating genes involved in focal adhesion and cytoskeleton organization in tumour cells.
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Affiliation(s)
- Magdalena Rudzińska
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, 01-813 Warsaw, Poland.
| | - Małgorzata Grzanka
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, 01-813 Warsaw, Poland.
| | - Anna Stachurska
- Department of Immunohematology, Centre of Postgraduate Medical Education, 01-813 Warsaw, Poland.
| | - Michał Mikula
- Department of Genetics, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, 02-781 Warsaw, Poland.
| | - Katarzyna Paczkowska
- Department of Genetics, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, 02-781 Warsaw, Poland.
| | - Tomasz Stępień
- Clinic of Endocrinological and General Surgery, Medical University of Lodz, 93-513 Lodz, Poland.
| | - Agnieszka Paziewska
- Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, 01-813 Warsaw, Poland.
| | - Jerzy Ostrowski
- Department of Genetics, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, 02-781 Warsaw, Poland.
- Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, 01-813 Warsaw, Poland.
| | - Barbara Czarnocka
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, 01-813 Warsaw, Poland.
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Zhang Q, Huang R, Ye Y, Guo X, Lu J, Zhu F, Gong X, Zhang Q, Yan J, Luo L, Zhuang S, Chen Y, Zhao X, Evans SM, Jiang C, Liang X, Sun Y. Temporal requirements for ISL1 in sympathetic neuron proliferation, differentiation, and diversification. Cell Death Dis 2018; 9:247. [PMID: 29445148 PMCID: PMC5833373 DOI: 10.1038/s41419-018-0283-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 12/14/2017] [Accepted: 12/22/2017] [Indexed: 12/22/2022]
Abstract
Malformations of the sympathetic nervous system have been associated with cardiovascular instability, gastrointestinal dysfunction, and neuroblastoma. A better understanding of the factors regulating sympathetic nervous system development is critical to the development of potential therapies. Here, we have uncovered a temporal requirement for the LIM homeodomain transcription factor ISL1 during sympathetic nervous system development by the analysis of two mutant mouse lines: an Isl1 hypomorphic line and mice with Isl1 ablated in neural crest lineages. During early development, ISL1 is required for sympathetic neuronal fate determination, differentiation, and repression of glial differentiation, although it is dispensable for initial noradrenergic differentiation. ISL1 also plays an essential role in sympathetic neuron proliferation by controlling cell cycle gene expression. During later development, ISL1 is required for axon growth and sympathetic neuron diversification by maintaining noradrenergic differentiation, but repressing cholinergic differentiation. RNA-seq analyses of sympathetic ganglia from Isl1 mutant and control embryos, together with ISL1 ChIP-seq analysis on sympathetic ganglia, demonstrated that ISL1 regulates directly or indirectly several distinct signaling pathways that orchestrate sympathetic neurogenesis. A number of genes implicated in neuroblastoma pathogenesis are direct downstream targets of ISL1. Our study revealed a temporal requirement for ISL1 in multiple aspects of sympathetic neuron development, and suggested Isl1 as a candidate gene for neuroblastoma.
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Affiliation(s)
- Qingquan Zhang
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Ru Huang
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Youqiong Ye
- School of Life Sciences and Technology, Tongji University, Shanghai, China
| | - Xiaoxia Guo
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jun Lu
- Key Laboratory of Systems Biomedicine, Ministry of Education, Shanghai Centre for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, China
| | - Fugui Zhu
- School of Life Sciences and Technology, Tongji University, Shanghai, China
| | - Xiaohui Gong
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Qitong Zhang
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jie Yan
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Lina Luo
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Shaowei Zhuang
- Seventh People's Hospital of Shanghai University of TCM, Shanghai, China
| | - Yihan Chen
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xiaodong Zhao
- Key Laboratory of Systems Biomedicine, Ministry of Education, Shanghai Centre for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, China
| | - Sylvia M Evans
- Department of Medicine, Department of Pharmacology, Skaggs School of Pharmacy, University of California San Diego, California, USA
| | - Cizhong Jiang
- School of Life Sciences and Technology, Tongji University, Shanghai, China.
| | - Xingqun Liang
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China.
| | - Yunfu Sun
- Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, Shanghai, China.
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Wang J, Huang Y, Zhang J, Wei Y, Mahoud S, Bakheet AMH, Wang L, Zhou S, Tang J. Pathway-related molecules of VEGFC/D-VEGFR3/NRP2 axis in tumor lymphangiogenesis and lymphatic metastasis. Clin Chim Acta 2016; 461:165-71. [PMID: 27527412 DOI: 10.1016/j.cca.2016.08.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 08/07/2016] [Accepted: 08/11/2016] [Indexed: 12/12/2022]
Abstract
Precondition for tumor lymphatic metastasis is that tumor cells induce formation of original and newborn lymphatic vessels and invade surrounding lymphatic vessels in tumor stroma, while some pathway-related molecules play an important role in mechanisms associated with proliferation and migration of lymphatic endothelial cells (LECs) and tumor cells. In lymphangiogenesis and lymphatic metastasis, the pathway-related molecules of VEGFC/D-VEGFR3/NRP2 axis, such as Furin-like enzyme, CNTN1, Prox1, LYVE-1, Podoplanin, SOX18, SDF1 and CXCR4, are direct constitutors as a portion of VEGFC/D-VEGFR3/NRP2 axis, and their biological activities rely on this ligand-receptor system. These axis-related signal molecules could gradually produce waterfall-like cascading effects, mediate differentiation and maturation of LECs, remodel original and neonatal lymphatic vessels, as well as ultimately promote tumor cell chemotaxis, migration, invasion and metastasis to lymphoid tracts. This review summarizes the structure and function features of pathway-related molecules of VEGFC/D-VEGFR3/NRP2 axis, the expression changes of these molecules in different anatomic organs or histopathologic types or development stages of various tumors, the characteristics of transduction, implementation, integration of signal networks, the interactive effects on biological behaviors between tumor cells and lymphatic endothelial cells, and their molecular mechanisms and significances in tumor lymphangiogenesis and lymphatic metastasis.
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Affiliation(s)
- Jingwen Wang
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China
| | - Yuhong Huang
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China
| | - Jun Zhang
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China
| | - Yuanyi Wei
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China
| | - Salma Mahoud
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China
| | - Ahmed Musa Hago Bakheet
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China
| | - Li Wang
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China
| | - Shuting Zhou
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China
| | - Jianwu Tang
- Department of Pathology, Dalian Medical University, Key Laboratory for Tumor Metastasis and Intervention of Liaoning Province, 9 West, Lvshun Southern Road, Dalian, Liaoning 116044, China.
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Holzmann J, Hennchen M, Rohrer H. Prox1 identifies proliferating neuroblasts and nascent neurons during neurogenesis in sympathetic ganglia. Dev Neurobiol 2015; 75:1352-67. [PMID: 25788138 DOI: 10.1002/dneu.22289] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 03/12/2015] [Indexed: 12/28/2022]
Abstract
Neurogenesis in embryonic sympathetic ganglia involves neuroblasts that resume proliferation following neuronal differentiation. As cell cycle exit is not associated with neuronal differentiation, the identity of proliferating neuroblasts is incompletely understood. Here, we use sympathetic ganglia of chick embryos to define the timing of neurogenesis and neuroblast identity focusing on the expression and function of the transcription factor Prox1. We show that a large fraction of neuroblasts has initially withdrawn from the cell cycle at embryonic day 3 (E3), which is reflected by a high proportion of p27(+)/Islet1(+) neuroblasts (63%) and low numbers of EdU(+)/Islet1(+) cells (12%). The proportion of proliferating Islet1(+) neuroblasts, identified by EdU pulse labeling and by the absence of the postmitotic marker p27 increases to reach maximal levels at E5, when virtually all neuroblasts are in the cell cycle (95%). Subsequently, the proportion of EdU-labeled and p27(-) neuroblasts is reduced to reach low levels at E11. Interestingly, the expression of the transcription factor Prox1 is restricted to the neuronal lineage, that is, Sox10(+)/Phox2b(+) neuron progenitors, proliferating p27(-)/Islet1(+) neuroblasts and nascent neurons but is rapidly lost in postmitotic neurons. In vitro and in vivo knockdown and overexpression experiments demonstrate effects of Prox1 in the support of neuroblast proliferation and survival. Taken together, these results define the neurogenesis period in the chick paravertebral sympathetic ganglia including an initial cell cycle withdrawal and identify Prox1 as a marker and regulator of proliferating sympathetic neuroblasts.
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Affiliation(s)
- Julia Holzmann
- Max-Planck-Institute for Brain Research; Research Group Developmental Neurobiology, Max-von-Laue-Str. 4, 60438 Frankfurt/Main, Germany
| | - Melanie Hennchen
- Max-Planck-Institute for Brain Research; Research Group Developmental Neurobiology, Max-von-Laue-Str. 4, 60438 Frankfurt/Main, Germany
| | - Hermann Rohrer
- Max-Planck-Institute for Brain Research; Research Group Developmental Neurobiology, Max-von-Laue-Str. 4, 60438 Frankfurt/Main, Germany.,Institute of Clinical Neuroanatomy, Goethe-University Frankfurt, Theodor-Stern-Kai 7, Frankfurt/Main, Germany
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8
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Elsir T, Smits A, Lindström MS, Nistér M. Transcription factor PROX1: its role in development and cancer. Cancer Metastasis Rev 2013; 31:793-805. [PMID: 22733308 DOI: 10.1007/s10555-012-9390-8] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The homeobox gene PROX1 is critical for organ development during embryogenesis. The Drosophila homologue, known as prospero has been shown to act as a tumor suppressor by controlling asymmetric cell division of neuroblasts. Likewise, alterations in PROX1 expression and function are associated with a number of human cancers including hematological malignancies, carcinomas of the pancreas, liver and the biliary system, sporadic breast cancer, Kaposiform hemangioendothelioma, colon cancer, and brain tumors. PROX1 is involved in cancer development and progression and has been ascribed both tumor suppressive and oncogenic properties in a variety of different cancer types. However, the exact mechanisms through which PROX1 regulates proliferation, migration, and invasion of cancer cells are by large unknown. This review provides an update on the role of PROX1 in organ development and on its emerging functions in cancer, with special emphasis on the central nervous system and glial brain tumors.
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Affiliation(s)
- Tamador Elsir
- Department of Oncology-Pathology, Karolinska Institutet, CCK R8:05, Karolinska University Hospital, 17176 Stockholm, Sweden.
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Podoplanin Lymphatic Density and Invasion Correlate With Adverse Clinicopathologic and Biological Factors and Survival in Neuroblastomas. Am J Surg Pathol 2012; 36:908-15. [DOI: 10.1097/pas.0b013e31824c0db9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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10
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BECKER JÜRGEN, FRÖHLICH JOHANNA, PERSKE CHRISTINA, PAVLAKOVIC HELENA, WILTING JÖRG. Reelin signalling in neuroblastoma: Migratory switch in metastatic stages. Int J Oncol 2012; 41:681-9. [DOI: 10.3892/ijo.2012.1488] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Accepted: 03/08/2012] [Indexed: 11/05/2022] Open
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Foskolou IP, Stellas D, Rozani I, Lavigne MD, Politis PK. Prox1 suppresses the proliferation of neuroblastoma cells via a dual action in p27-Kip1 and Cdc25A. Oncogene 2012; 32:947-60. [PMID: 22508481 DOI: 10.1038/onc.2012.129] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Neuroblastoma is a pediatric tumor that originates from precursor cells of the sympathetic nervous system with less than 40% long-term survival in children diagnosed with high-risk disease. These clinical observations underscore the need for novel insights in the mechanisms of malignant transformation and progression. Accordingly, it was recently reported that Prox1, a homeobox transcription regulator, is expressed in higher levels in human neuroblastoma with favorable prognosis. Consistently, we have recently shown that Prox1 exerts a strong antiproliferative effect on neural precursor cells during embryonic development. Thus, Prox1 is a candidate gene with a critical role in suppressing malignant neuroblastoma transformation. Here, we provide evidence that Prox1 strongly suppresses the proliferation of mouse and human neuroblastoma cell lines and blocks the growth of neuroblastoma tumors in SCID mice. Conversely, short hairpin RNA (shRNA) -mediated knockdown of basal Prox1 expression significantly induces proliferation, genomic instability and the ability of neuroblastoma cells to form tumors. Mechanistically, analysis of an inducible Prox1-overexpressing Neuro2A cell line indicates that Prox1 is sufficient to suppress CyclinD1, CyclinA and CyclinB1, consistent with a role in cell cycle arrest. Surprisingly, Prox1 strongly induces CyclinE1 expression in the same system despite its action on blocking cell cycle progression, which could account for the context dependent oncogenic function of Prox1. Most importantly, Prox1 was sufficient to decrease Cdc25A and induce p27-Kip1, but not p21-Cip1 or p53. By alleviating the Prox1 action in Cdc25A and p27-Kip1 expression, we were able to rescue its effect on cell cycle arrest. Together these data suggest that Prox1 negatively regulates neuroblastoma carcinogenesis through suppression of Cdc25A and induction of p27-Kip1 to counteract CyclinE1 overexpression and block cell cycle progression. Furthermore, these observations render Prox1 a candidate target for the treatment of neuroblastoma tumors.
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Affiliation(s)
- I P Foskolou
- Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
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12
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Truman LA, Bentley KL, Smith EC, Massaro SA, Gonzalez DG, Haberman AM, Hill M, Jones D, Min W, Krause DS, Ruddle NH. ProxTom lymphatic vessel reporter mice reveal Prox1 expression in the adrenal medulla, megakaryocytes, and platelets. THE AMERICAN JOURNAL OF PATHOLOGY 2012; 180:1715-25. [PMID: 22310467 PMCID: PMC3349900 DOI: 10.1016/j.ajpath.2011.12.026] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 11/23/2011] [Accepted: 12/08/2011] [Indexed: 11/29/2022]
Abstract
Lymphatic vessels (LVs) are important structures for antigen presentation, for lipid metabolism, and as conduits for tumor metastases, but they have been difficult to visualize in vivo. Prox1 is a transcription factor that is necessary for lymphangiogenesis in ontogeny and the maintenance of LVs. To visualize LVs in the lymph node of a living mouse in real time, we made the ProxTom transgenic mouse in a C57BL/6 background using red fluorescent LVs that are suitable for in vivo imaging. The ProxTom transgene contained all Prox1 regulatory sequences and was faithfully expressed in LVs coincident with endogenous Prox1 expression. The progenies of a ProxTom × Hec6stGFP cross were imaged using two-photon laser scanning microscopy, allowing the simultaneous visualization of LVs and high endothelial venules in a lymph node of a living mouse for the first time. We confirmed the expression of Prox1 in the adult liver, lens, and dentate gyrus. These intensely fluorescent mice revealed the expression of Prox1 in three novel sites: the neuroendocrine cells of the adrenal medulla, megakaryocytes, and platelets. The novel sites identified herein suggest previously unknown roles for Prox1. The faithful expression of the fluorescent reporter in ProxTom LVs indicates that these mice have potential utility in the study of diseases as diverse as lymphedema, filariasis, transplant rejection, obesity, and tumor metastasis.
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Affiliation(s)
- Lucy A. Truman
- Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Connecticut
| | - Kevin L. Bentley
- Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Connecticut
| | - Elenoe C. Smith
- Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut
| | - Stephanie A. Massaro
- Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut
| | - David G. Gonzalez
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut
| | - Ann M. Haberman
- Department of Laboratory Medicine, Yale University School of Medicine, New Haven, Connecticut
| | - Myriam Hill
- Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Connecticut
| | - Dennis Jones
- Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut
| | - Wang Min
- Department of Pathology, Yale University School of Medicine, New Haven, Connecticut
| | - Diane S. Krause
- Department of Laboratory Medicine, Yale University School of Medicine, New Haven, Connecticut
| | - Nancy H. Ruddle
- Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Connecticut
- Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut
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Ramani P, Norton A, Somerville MS, May MT. PROX1 lymphatic density correlates with adverse clinicopathological factors, lymph node metastases and survival in neuroblastomas. J Neurooncol 2012; 108:375-83. [DOI: 10.1007/s11060-012-0838-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2011] [Accepted: 02/20/2012] [Indexed: 12/25/2022]
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Ramani P, Dungwa JV, May MT. LYVE-1 upregulation and lymphatic invasion correlate with adverse prognostic factors and lymph node metastasis in neuroblastoma. Virchows Arch 2012; 460:183-91. [PMID: 22241180 DOI: 10.1007/s00428-011-1190-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Revised: 12/12/2011] [Accepted: 12/26/2011] [Indexed: 11/28/2022]
Abstract
Neuroblastoma (NB) accounts for 15% of all childhood cancer deaths. The majority of patients have widespread lymphatic and/or haematogenous metastases at diagnosis, but lymphangiogenesis has not been well documented. Sixty-seven NBs were immunostained for the lymphatic endothelial marker, LYVE-1, and the lymphatic density (LD) and lymphatic invasion (LI), were counted in LYVE-1-expressing lymphatics. LYVE-1-stained lymphatic vessels and LI were present in 26/67 (39%) and 14/67 (21%) of the NBs, respectively. Central LD (CLD) and LI were higher in NBs from stage 4 (p = 0.012, p = 0.004, respectively), high-risk group (p = 0.030, p = 0.002), NBs with high mitosis karyorrhexis index (MKI) (p = 0.011, p = 0.005), unfavourable histology group (p = 0.040, p = 0.017) and distant lymph node metastasis (LNM) (p < 0.001 for each). Marginal LD (MLD) was higher in patients with LNM (p < 0.001). CLD and MLD correlated with LI (p < 0.001 each). Total LYVE-1 protein levels, quantified by a sensitive enzyme-linked immunosorbent assay (n = 55), were also higher in NBs from patients with stage 4 disease (p = 0.046), high-risk group (p = 0.028), MYCN-amplified NBs (p = 0.034) and LNM (p = 0.038). Kaplan-Meier analysis showed that the presence of CLD was associated with both worse OS at 5 years (77% [95% CI: 62-87%] versus 60% [95% CI: 32-80%], p = 0.062) and EFS (74% [95% CI: 58-85%] versus 43% [95% CI: 15-69%], p = 0.070) and LI with OS (71% [95% CI: 57-81%] versus 56% [95% CI: 26-78%], p = 0.055). Significant upregulation of LYVE-1 and the presence of LI in patients with stage 4 and high-risk disease, MYCN-amplification and LNM suggests that LYVE-1 may have value as predictors of outcome.
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Affiliation(s)
- Pramila Ramani
- Department of Histopathology, Bristol Royal Infirmary, Bristol, BS2 8HW, UK.
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