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Jambrovics K, Póliska S, Scholtz B, Uray IP, Balajthy Z. ATO Increases ROS Production and Apoptosis of Cells by Enhancing Calpain-Mediated Degradation of the Cancer Survival Protein TG2. Int J Mol Sci 2023; 24:10938. [PMID: 37446117 DOI: 10.3390/ijms241310938] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Revised: 05/14/2023] [Accepted: 06/28/2023] [Indexed: 07/15/2023] Open
Abstract
Transglutaminase 2 (TG2) is a critical cancer cell survival factor that activates several signalling pathways to foster drug resistance, cancer stem cell survival, metastasis, inflammation, epithelial-mesenchymal transition, and angiogenesis. All-trans retinoic acid (ATRA) and chemotherapy have been the standard treatments for acute promyelocytic leukaemia (APL), but clinical studies have shown that arsenic trioxide (ATO), alone or in combination with ATRA, can improve outcomes. ATO exerts cytotoxic effects in a variety of ways by inducing oxidative stress, genotoxicity, altered signal transduction, and/or epigenetic modification. In the present study, we showed that ATO increased ROS production and apoptosis ratios in ATRA-differentiated NB4 leukaemia cells, and that these responses were enhanced when TG2 was deleted. The combined ATRA + ATO treatment also increased the amount of nuclear factor erythroid 2-related factor 2 (NRF2) transcription factor, an adaptive regulator of the cellular oxidative stress response, and calpain proteolytic activity, resulting in TG2 degradation and the reduced survival of WT leukaemia cells. We further showed that the induced TG2 protein expression was degraded in the MCF-7 epithelial cell line and primary peripheral blood mononuclear cells upon ATO treatment, thereby sensitising these cell types to apoptotic signals.
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Affiliation(s)
- Károly Jambrovics
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Szilárd Póliska
- Genomic Medicine and Bioinformatic Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary
| | - Beáta Scholtz
- Genomic Medicine and Bioinformatic Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary
| | - Iván P Uray
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- Department of Clinical Oncology, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Zoltán Balajthy
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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2
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Scholtz B, Horváth J, Tar I, Kiss C, Márton IJ. Salivary miR-31-5p, miR-345-3p, and miR-424-3p Are Reliable Biomarkers in Patients with Oral Squamous Cell Carcinoma. Pathogens 2022; 11:pathogens11020229. [PMID: 35215172 PMCID: PMC8876825 DOI: 10.3390/pathogens11020229] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 02/07/2022] [Accepted: 02/07/2022] [Indexed: 12/27/2022] Open
Abstract
If not detected early, oral squamous cell carcinoma (OSCC) has very poor prognosis, emphasizing the need for reliable early diagnostics. Saliva is considered a promising surrogate biosample for OSCC detection, because it comes into contact with many cells of the tumor mass, providing a comprehensive sampling of tumor-specific biomolecules. Although several protein- and RNA-based salivary biomarkers have been proposed for the detection of OSCC, the results of the studies show large differences. Our goal was to clarify which salivary microRNAs (miRNA) show reliably high expression in the saliva of OSCC patients, to be used as cancer-specific biomarkers, and potentially as early diagnostic biomarkers. Based on a detailed literature search, we selected six miRNAs commonly overexpressed in OSCC, and analyzed their expression in saliva samples of cancer patients and controls by real-time quantitative PCR. Our results suggest that miR-345 and miR-31-5p are consistently upregulated salivary biomarkers for OSCC, and a three-miRNA panel of miR-345, miR-31-5p, and miR-424-3p can distinguish cancer and control patients with high sensitivity.
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Affiliation(s)
- Beáta Scholtz
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
- Correspondence: ; Tel.: +36-30-634-6065; Fax: +36-52-314-989
| | - József Horváth
- Doctoral School of Molecular Cell and Immune Biology, University of Debrecen, 4032 Debrecen, Hungary;
| | - Ildikó Tar
- Department of Oral Medicine, Faculty of Dentistry, University of Debrecen, 4032 Debrecen, Hungary;
| | - Csongor Kiss
- Department of Pediatrics, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary;
| | - Ildikó J. Márton
- Department of Restorative Dentistry, Faculty of Dentistry, University of Debrecen, 4032 Debrecen, Hungary;
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Serrano-Solano B, Föll MC, Gallardo-Alba C, Erxleben A, Rasche H, Hiltemann S, Fahrner M, Dunning MJ, Schulz MH, Scholtz B, Clements D, Nekrutenko A, Batut B, Grüning BA. Fostering accessible online education using Galaxy as an e-learning platform. PLoS Comput Biol 2021; 17:e1008923. [PMID: 33983944 PMCID: PMC8118283 DOI: 10.1371/journal.pcbi.1008923] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The COVID-19 pandemic is shifting teaching to an online setting all over the world. The Galaxy framework facilitates the online learning process and makes it accessible by providing a library of high-quality community-curated training materials, enabling easy access to data and tools, and facilitates sharing achievements and progress between students and instructors. By combining Galaxy with robust communication channels, effective instruction can be designed inclusively, regardless of the students' environments.
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Affiliation(s)
- Beatriz Serrano-Solano
- Bioinformatics Group, Department of Computer Science, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Melanie C. Föll
- Khoury College of Computer Sciences, Northeastern University, Boston, Massachusetts, United States of America
- Institute for Surgical Pathology, Medical Center, University of Freiburg, Freiburg, Germany
- Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Cristóbal Gallardo-Alba
- Bioinformatics Group, Department of Computer Science, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Anika Erxleben
- Bioinformatics Group, Department of Computer Science, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Helena Rasche
- Avans Hogeschool, Breda, the Netherlands
- Erasmus Medical Center, Clinical Bioinformatics Group, Department of Pathology, Rotterdam, the Netherlands
| | - Saskia Hiltemann
- Erasmus Medical Center, Clinical Bioinformatics Group, Department of Pathology, Rotterdam, the Netherlands
| | - Matthias Fahrner
- Institute for Surgical Pathology, Medical Center, University of Freiburg, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
- Spemann Graduate School of Biology and Medicine, University of Freiburg, Freiburg, Germany
| | - Mark J. Dunning
- Faculty of Medicine, Dentistry and Health, University of Sheffield, Sheffield, United Kingdom
| | - Marcel H. Schulz
- Institute for Cardiovascular Regeneration, Goethe University, Frankfurt am Main, Germany
| | - Beáta Scholtz
- University of Debrecen, Faculty of Medicine, Dept. of Biochemistry and Molecular Biology, Debrecen, Hungary
| | - Dave Clements
- Johns Hopkins University, Baltimore Maryland, United States of America
| | - Anton Nekrutenko
- Center for Comparative Genomics and Bioinformatics, Penn State University, State College, Pennsylvania, United States of America
| | - Bérénice Batut
- Bioinformatics Group, Department of Computer Science, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Björn A. Grüning
- Bioinformatics Group, Department of Computer Science, Albert-Ludwigs-University Freiburg, Freiburg, Germany
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Scholtz B, Vo Minh D, Kiss C, Tar I, Kumar A, Tőzsér J, Csősz É, Márton I. Examination of Oral Squamous Cell Carcinoma and Precancerous Lesions Using Proximity Extension Assay and Salivary RNA Quantification. Biomedicines 2020; 8:biomedicines8120610. [PMID: 33327496 PMCID: PMC7764999 DOI: 10.3390/biomedicines8120610] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/09/2020] [Accepted: 12/10/2020] [Indexed: 12/24/2022] Open
Abstract
Saliva is an easy-to access body fluid with high diagnostic potential. The utilization of saliva for oral cancer diagnosis can be an attractive possibility. Besides the oral cancer, it is important to better understand the precancerous lesions such as oral lichen planus (OLP) and leukoplakia (OLK). In order to examine the changes of salivary proteins in controls, patients with oral cancer, and patients with precancerous conditions, proximity extension assay was utilized. Some proteins and functions were characteristic to the examined groups and can serve as a starting point for further biomarker studies. The different nature of OLK and OLP was demonstrated, showing the malignant transformation and the inflammation as the prominent biological processes in the OLK and OLP, respectively. The salivary level of IL6 was verified using quantitative ELISA and the mRNA level was also studied. Elevated IL6 levels could be detected in precancerous groups compared to controls.
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Affiliation(s)
- Beáta Scholtz
- Genomic Medicine and Bioinformatic Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary;
| | - Doan Vo Minh
- Biomarker Research Group, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (D.V.M.); (A.K.)
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary;
| | - Csongor Kiss
- Department of Pediatrics, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary;
| | - Ildikó Tar
- Department of Oral Medicine, Faculty of Dentistry, University of Debrecen, 4032 Debrecen, Hungary;
| | - Ajneesh Kumar
- Biomarker Research Group, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (D.V.M.); (A.K.)
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary;
- Doctoral School of Molecular Cell and Immune Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - József Tőzsér
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary;
| | - Éva Csősz
- Biomarker Research Group, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (D.V.M.); (A.K.)
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary;
- Correspondence: (É.C.); (I.M.); Tel.: +36-52-416432 (É.C.)
| | - Ildikó Márton
- Department of Restorative Dentistry, Faculty of Dentistry, University of Debrecen, 4032 Debrecen, Hungary
- Correspondence: (É.C.); (I.M.); Tel.: +36-52-416432 (É.C.)
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5
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Gyurina K, Kárai B, Ujfalusi A, Hevessy Z, Barna G, Jáksó P, Pálfi-Mészáros G, Póliska S, Scholtz B, Kappelmayer J, Zahuczky G, Kiss C. Coagulation FXIII-A Protein Expression Defines Three Novel Sub-populations in Pediatric B-Cell Progenitor Acute Lymphoblastic Leukemia Characterized by Distinct Gene Expression Signatures. Front Oncol 2019; 9:1063. [PMID: 31709175 PMCID: PMC6823876 DOI: 10.3389/fonc.2019.01063] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 09/30/2019] [Indexed: 12/17/2022] Open
Abstract
Background: Leukemic B-cell precursor (BCP) lymphoblasts were identified as a novel expression site for coagulation factor XIII subunit A (FXIII-A). Flow cytometry (FC) revealed three distinct expression patterns, i.e., FXIII-A negative, FXIII-A dim, and FXIII-A bright subgroups. The FXIII-A negative subgroup was significantly associated with the “B-other” genetic category and had an unfavorable disease outcome. Methods: RNA was extracted from bone marrow lymphoblasts of 42 pediatric patients with BCP-acute lymphoblastic leukemia (ALL). FXIII-A expression was determined by multiparameter FC. Genetic diagnosis was based on conventional cytogenetic method and fluorescence in situ hybridization. Affymetrix GeneChip Human Primeview array was used to analyze global expression pattern of 28,869 well-annotated genes. Microarray data were analyzed by Genespring GX14.9.1 software. Gene Ontology analysis was performed using Cytoscape 3.4.0 software with ClueGO application. Selected differentially expressed genes were validated by RT-Q-PCR. Results: We demonstrated, for the first time, the general expression of F13A1 gene in pediatric BCP-ALL samples. The intensity of F13A1 expression corresponded to the FXIII-A protein expression subgroups which defined three characteristic and distinct gene expression signatures detected by Affymetrix oligonucleotide microarrays. Relative gene expression intensity of ANGPTL2, EHMT1 FOXO1, HAP1, NUCKS1, NUP43, PIK3CG, RAPGEF5, SEMA6A, SPIN1, TRH, and WASF2 followed the pattern of change in the intensity of the expression of the F13A1 gene. Common enhancer elements of these genes revealed by in silico analysis suggest that common transcription factors may regulate the expression of these genes in a similar fashion. PLAC8 was downregulated in the FXIII-A bright subgroup. Gene expression signature of the FXIII-A negative subgroup showed an overlap with the signature of “B-other” samples. DFFA, GIGYF1, GIGYF2, and INTS3 were upregulated and CD3G was downregulated in the “B-other” subgroup. Validated genes proved biologically and clinically relevant. We described differential expression of genes not shown previously to be associated with pediatric BCP-ALL. Conclusions: Gene expression signature according to FXIII-A protein expression status defined three novel subgroups of pediatric BCP-ALL. Multiparameter FC appears to be an easy-to-use and affordable method to help in selecting FXIII-A negative patients who require a more elaborate and expensive molecular genetic investigation to design precision treatment.
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Affiliation(s)
- Katalin Gyurina
- Department of Pediatrics, University of Debrecen, Debrecen, Hungary
| | - Bettina Kárai
- Department of Laboratory of Medicine, University of Debrecen, Debrecen, Hungary
| | - Anikó Ujfalusi
- Department of Laboratory of Medicine, University of Debrecen, Debrecen, Hungary
| | - Zsuzsanna Hevessy
- Department of Laboratory of Medicine, University of Debrecen, Debrecen, Hungary
| | - Gábor Barna
- 1st Department of Pathology and Experimental Cancer Research, Semmelweis University, Budapest, Hungary
| | - Pál Jáksó
- Department of Pathology, University of Pécs, Pécs, Hungary
| | | | - Szilárd Póliska
- Genomic Medicine and Bioinformatic Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Beáta Scholtz
- Genomic Medicine and Bioinformatic Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - János Kappelmayer
- Department of Laboratory of Medicine, University of Debrecen, Debrecen, Hungary
| | - Gábor Zahuczky
- UD GenoMed Medical Genomic Technologies Ltd., Debrecen, Hungary
| | - Csongor Kiss
- Department of Pediatrics, University of Debrecen, Debrecen, Hungary
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6
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Sarang Z, Gyurina K, Scholtz B, Kiss C, Szegedi I. Altered expression of autophagy-related genes might contribute to glucocorticoid resistance in precursor B-cell-type acute lymphoblastic leukemia. Eur J Haematol 2016; 97:453-460. [PMID: 26947147 DOI: 10.1111/ejh.12753] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2016] [Indexed: 01/13/2023]
Abstract
OBJECTIVES Autophagy is an evolutionarily conserved process playing an important role in tumor cell's resistance to chemotherapy. Response to glucocorticoid (GC) treatment is out of the most important prognostic factors in childhood acute lymphoblastic leukemia (ALL); however, only few data are available connecting GC response and role of autophagy. Our aim was to investigate whether altered expression of autophagy-related genes contributes to GC-resistant phenotype in GC-sensitive and GC-resistant precursor B-cell-type (PBC) ALL cells. METHODS Gene expression data were obtained from public database for 26 children diagnosed with PBC ALL either sensitive or resistant to in vitro prednisolone treatment. RESULTS We have identified 36 autophagy-associated genes which were differently expressed, based on at least a twofold difference, GC-sensitive group as compared to GC-resistant one. Of the 36 genes, 10 were downregulated and 26 upregulated in the GC-resistant group. The average fold change values for the decreased and increased transcripts were -4.57 and 2.67, respectively. CONCLUSIONS Our data imply that GC sensitivity might depend on the expression of several genes involved in regulation and execution of autophagy in a way that key autophagy inducers are downregulated while inhibitors of autophagy are upregulated in GC-resistant cells.
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Affiliation(s)
- Zsolt Sarang
- Department of Biochemistry and Molecular Biology, Clinical Center, University of Debrecen, Debrecen, Hungary
| | - Katalin Gyurina
- Department of Pediatric Hematology-Oncology, Institute of Pediatrics, Clinical Center, University of Debrecen, Debrecen, Hungary
| | - Beáta Scholtz
- Department of Clinical Genomics, Clinical Center, University of Debrecen, Debrecen, Hungary
| | - Csongor Kiss
- Department of Pediatric Hematology-Oncology, Institute of Pediatrics, Clinical Center, University of Debrecen, Debrecen, Hungary
| | - István Szegedi
- Department of Pediatric Hematology-Oncology, Institute of Pediatrics, Clinical Center, University of Debrecen, Debrecen, Hungary.
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Hutóczki G, Bognár L, Tóth J, Scholtz B, Zahuczky G, Hanzély Z, Csősz É, Reményi-Puskár J, Kalló G, Hortobágyi T, Klekner A. Effect of Concomitant Radiochemotherapy on Invasion Potential of Glioblastoma. Pathol Oncol Res 2015; 22:155-60. [PMID: 26450124 DOI: 10.1007/s12253-015-9989-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 09/29/2015] [Indexed: 01/22/2023]
Abstract
Glioblastoma (GBM) is the most common primary brain tumor in adults with inevitable recurrence after oncotherapy. The insufficient effect of "gold standard" temozolomide-based concomitant radiochemotherapy may be due to the inability to prevent tumor cell invasion. Peritumoral infiltration depends mainly on the interaction between extracellular matrix (ECM) components and cell membrane receptors. Changes in invasive behaviour after oncotherapy can be evaluated at the molecular level by determining the RNA expression and protein levels of the invasion-related ECM components. The expression of nineteen ECM molecules was determined at both RNA and protein levels in thirty-one GBM samples. Fifteen GBM samples originated from the first surgical procedure on patients before oncotherapy, and sixteen GBM samples were collected at the second surgery due to local recurrence after concomitant chemoirradiation. RNA expressions were measured with qRT-PCR, and protein levels were determined by quantitative analysis of Western blots. Only MMP-9 RNA transcript level was reduced (p < 0.05) whereas at protein level, eight molecules showed changes concordant with RNA expression with significant decrease in brevican only. The results suggest that concomitant radiochemotherapy does not have sufficient impact on the expression of invasion-related ECM components of glioblastoma, oncotherapy does not significantly affect its invasive behavior. To avoid the spread of tumors into the brain parenchyma, supplementation of antiproliferative treatment with anti-invasive agents may be worth consideration in oncotherapy for glioblastoma.
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Affiliation(s)
- Gábor Hutóczki
- Department of Neurosurgery, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary
| | - László Bognár
- Department of Neurosurgery, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary.
| | - Judit Tóth
- Department of Oncology, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary
| | - Beáta Scholtz
- Department of Biochemistry and Molecular Biology, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary
| | - Gábor Zahuczky
- Department of Biochemistry and Molecular Biology, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary.,UD-Genomed Medical Genomic Technologies Ltd., Nagyerdei krt. 98, Debrecen, 4032, Hungary
| | - Zoltán Hanzély
- National Institute of Clinical Neurosciences, Amerikai út 57, Budapest, 1145, Hungary
| | - Éva Csősz
- Department of Biochemistry and Molecular Biology, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary
| | - Judit Reményi-Puskár
- Department of Neurosurgery, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary
| | - Gergő Kalló
- Department of Biochemistry and Molecular Biology, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary
| | - Tibor Hortobágyi
- Division of Neuropathology, Institute of Pathology, Faculty of Medicine, University of Debrecen, Nagyerdei krt. 98, Debrecen, 4032, Hungary
| | - Almos Klekner
- Department of Neurosurgery, University of Debrecen, Clinical Center, Nagyerdei krt. 98, Debrecen, 4032, Hungary
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Tóth K, Sarang Z, Scholtz B, Brázda P, Ghyselinck N, Chambon P, Fésüs L, Szondy Z. Retinoids enhance glucocorticoid-induced apoptosis of T cells by facilitating glucocorticoid receptor-mediated transcription. Cell Death Differ 2011; 18:783-92. [PMID: 21072052 PMCID: PMC3131916 DOI: 10.1038/cdd.2010.136] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 09/20/2010] [Accepted: 09/30/2010] [Indexed: 11/09/2022] Open
Abstract
Glucocorticoid-induced apoptosis of thymocytes is one of the first recognized forms of programmed cell death. It was shown to require gene activation induced by the glucocorticoid receptor (GR) translocated into the nucleus following ligand binding. In addition, the necessity of the glucocorticoid-induced, but transcription-independent phosphorylation of phosphatidylinositol-specific phospholipase C (PI-PLC) has also been shown. Here we report that retinoic acids, physiological ligands for the nuclear retinoid receptors, enhance glucocorticoid-induced death of mouse thymocytes both in vitro and in vivo. The effect is mediated by retinoic acid receptor (RAR) alpha/retinoid X receptor (RXR) heterodimers, and occurs when both RARα and RXR are ligated by retinoic acids. We show that the ligated RARα/RXR interacts with the ligated GR, resulting in an enhanced transcriptional activity of the GR. The mechanism through which this interaction promotes GR-mediated transcription does not require DNA binding of the retinoid receptors and does not alter the phosphorylation status of Ser232, known to regulate the transcriptional activity of GR. Phosphorylation of PI-PLC was not affected. Besides thymocytes, retinoids also promoted glucocorticoid-induced apoptosis of various T-cell lines, suggesting that they could be used in the therapy of glucocorticoid-sensitive T-cell malignancies.
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Affiliation(s)
- K Tóth
- Apoptosis and Genomics Research Group, Department of Biochemistry and Molecular Biology, Hungarian Academy of Sciences, University of Debrecen, Debrecen, Hungary
| | - Z Sarang
- Apoptosis and Genomics Research Group, Department of Biochemistry and Molecular Biology, Hungarian Academy of Sciences, University of Debrecen, Debrecen, Hungary
| | - B Scholtz
- Apoptosis and Genomics Research Group, Department of Biochemistry and Molecular Biology, Hungarian Academy of Sciences, University of Debrecen, Debrecen, Hungary
| | - P Brázda
- Apoptosis and Genomics Research Group, Department of Biochemistry and Molecular Biology, Hungarian Academy of Sciences, University of Debrecen, Debrecen, Hungary
| | - N Ghyselinck
- Département de Biologie Cellulaire and Développement, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Strasbourg, France
| | - P Chambon
- Département de Biologie Cellulaire and Développement, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Strasbourg, France
| | - L Fésüs
- Apoptosis and Genomics Research Group, Department of Biochemistry and Molecular Biology, Hungarian Academy of Sciences, University of Debrecen, Debrecen, Hungary
| | - Z Szondy
- Apoptosis and Genomics Research Group, Department of Biochemistry and Molecular Biology, Hungarian Academy of Sciences, University of Debrecen, Debrecen, Hungary
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Miko E, Margitai Z, Czimmerer Z, Várkonyi I, Dezso B, Lányi A, Bacsó Z, Scholtz B. miR-126 inhibits proliferation of small cell lung cancer cells by targeting SLC7A5. FEBS Lett 2011; 585:1191-6. [PMID: 21439283 DOI: 10.1016/j.febslet.2011.03.039] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2010] [Revised: 03/16/2011] [Accepted: 03/16/2011] [Indexed: 11/19/2022]
Abstract
Despite intensive efforts to improve therapies, small cell lung cancer (SCLC) still has a dismal median survival of 18 months. Since miR-126 is under-expressed in the majority of SCLC tumors, we investigated the effect of miR-126 overexpression on the proliferation and cell cycle distribution of H69 cells. Our results demonstrate that miR-126 inhibits proliferation of H69 cells, by delaying the cells in the G1 phase. Short interfering RNA (siRNA) mediated suppression of SLC7A5, a predicted target of mir-126, has the same effect on H69 cells. We also show for the first time that SLC7A5 is a direct target of miR-126.
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Affiliation(s)
- Edit Miko
- Dept. of Biochemistry and Molecular Biology, Clinical Genomics Center, University of Debrecen Medical and Health Science Center, Hungary
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10
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Inczédy-Farkas G, Benkovits J, Balogh N, Almos P, Scholtz B, Zahuczky G, Török Z, Nagy K, Réthelyi J, Makkos Z, Kassai-Farkas A, Egerházy A, Tuzko J, Janka Z, Bitter I, Németh G, Nagy L, Molnár MJ. [SCHIZOBANK - The Hungarian national schizophrenia biobank and its role in schizophrenia research and in personalized medicine]. Orv Hetil 2010; 151:1403-8. [PMID: 20719713 DOI: 10.1556/oh.2010.28943] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Delineating the pathogenesis of multifactorial diseases is a major challenge of the postgenomial era. Genetic factors are known to play an important role in the pathogenesis of certain psychiatric disorders as well as in the development of adverse reactions to psychoactive drugs. Containing large numbers of samples and linking them clinical data, biobanks are gaining importance in the studies of chronic multifactorial diseases. Several biobanks are under establishment in Hungary. The first initiative to collect samples in neurological and psychiatric disorders was the NEPSYBANK coordinated by the Hungarian Society of Clinical Neurogenetics. The national biobank network is currently established by the NEKIFUT project of the National Office of Research and Technology. In this article we describe the structure, logistics and informatical background of the national schizophrenia biobank (SCHIZOBANK). The initiative of the SCHIZOBANK originates from a consortium in which academy and health industry partners are collecting biological materials and data in five major psychiatric center under the coordination of the Medical and Health Science Center of the University of Debrecen. We review other international schizophrenia biobanks as well. Major strength of the SCHIZOBANK is the collection of very detailed phenotypic data and of RNA and plasma both in psychotic and non-psychotic state of the patient which permits longitudinal follow-up and the study of both static and dynamically changing transcriptomic, proteomic and metabolomic markers. The collection of the SCHIZOBANK is available not only to consortial partners but to other national and international research groups as well.
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Affiliation(s)
- Gabriella Inczédy-Farkas
- Semmelweis Egyetem, Altalános Orvostudományi Kar, Molekuláris Neurológiai Klinikai és Kutatási Központ, Neurológiai Klinika, Budapest
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11
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Varga I, Hutóczki G, Petrás M, Scholtz B, Mikó E, Kenyeres A, Tóth J, Zahuczky G, Bognár L, Hanzély Z, Klekner A. Expression of invasion-related extracellular matrix molecules in human glioblastoma versus intracerebral lung adenocarcinoma metastasis. ACTA ACUST UNITED AC 2010; 71:173-80. [PMID: 20397122 DOI: 10.1055/s-0030-1249698] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Tumor cell invasion into the surrounding brain tissue is mainly responsible for the failure of radical surgical resection, with tumor recurrence in the form of microdisseminated disease. Extracellular matrix (ECM)-related molecules and their receptors predominantly participate in the invasion process, including cell adhesion to the surrounding microenvironment and cell migration. The extent of infiltration of the healthy brain by malignant tumors strongly depends on the tumor cell type. Malignant gliomas show much more intensive peritumoral invasion than do metastatic tumors. In this study, the mRNA expression of 30 invasion-related molecules (twenty-one ECM components, two related receptors, and seven ECM-related enzymes) was investigated by quantitative reverse transcriptase-polymerase chain reaction. Fresh frozen human tissue samples from glioblastoma (GBM), intracerebral lung adenocarcinoma metastasis, and normal brain were evaluated. Significant differences were established for 24 of the 30 molecules. To confirm our results at the protein level, immunohistochemical analysis of seven molecules was performed (agrin, neurocan, syndecan, versican, matrix metalloproteinase 2 [MMP-2], MMP-9, and hyaluronan). Determining the differences in the levels of invasion-related molecules for tumors of different origins can help to identify the exact molecular mechanisms that facilitate peritumoral infiltration by glioblastoma cells. These results should allow the selection of target molecules for potential chemotherapeutic agents directed against highly invasive malignant gliomas.
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Affiliation(s)
- I Varga
- Kenezy Hospital, Debrecen, Department of Pulmonology, Debrecen, Hungary
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12
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Klekner A, Varga I, Bognár L, Hutóczki G, Kenyeres A, Tóth J, Hanzély Z, Scholtz B. [Extracellular matrix of cerebral tumors with different invasiveness]. Ideggyogy Sz 2010; 63:38-43. [PMID: 20420122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
OBJECTIVES Ineffective surgical and radiotherapy of glioblastoma is mainly due to its intensive infiltrating behavior. Contrarily, brain metastases of anaplastic carcinomas are well-circumscribed intracerebral lesions that can be easily exstirpated in most cases. The molecules of the extracellular matrix (ECM) play a pivotal role in the peritumoral infiltration. In this study the mRNA expression of the ECM components was investigated in two types of intracerebral malignoma with different invasion activity. Our aim was to identify the ECM molecules that are responsible for the different intensity of peritumoral infiltration of tumors from different origin. METHODS The mRNA expression of twenty-three ECM molecules was determined by quantitative reverse transcriptase polymerase chain reaction. Four pieces of glioblastoma and four pieces of intracerebral lung adenocarcinoma metastasis from neurosurgical operation were investigated. Immunohistochemical investigations were performed in case of five molecules. RESULTS The mRNA expression of nine molecules (brevican, neurocan, neuroglycan-C, syndecan-1,2,4, tenascin-C, versican and matrix-metalloproteinase-[MMP]2) differed significantly by comparison of the two tumor types. By immunohistochemistry, neurocan, syndecan, versican and MMP-2 showed alteration in staining intensity according to the mRNA expression, while MMP-9 showed higher staining intensity in the metastatic tumor. CONCLUSIONS The identified molecules can play an important role in the different infiltration activity of tumors from different origin. Thus these ECM-components could serve as targets for anti-invasion therapy in the future.
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Affiliation(s)
- Almos Klekner
- Debreceni Egyetem, Orvos- es Egészségtudományi Centrum, Idegsebészeti Klinika, Debrecen.
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13
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Miko E, Czimmerer Z, Csánky E, Boros G, Buslig J, Dezső B, Scholtz B. DIFFERENTIALLY EXPRESSED MicroRNAs IN SMALL CELL LUNG CANCER. Exp Lung Res 2009; 35:646-64. [DOI: 10.3109/01902140902822312] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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14
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Petrás M, Hutóczki G, Varga I, Vereb G, Szöllosi J, Bognár L, Ruszthi P, Kenyeres A, Tóth J, Hanzély Z, Scholtz B, Klekner A. [Expression pattern of invasion-related molecules in brain tumors of different origin]. Magy Onkol 2009; 53:253-258. [PMID: 19793689 DOI: 10.1556/monkol.53.2009.3.3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Tumor cell invasion into the surrounding brain tissue is mainly responsible for the failure of radical surgical resection and successful treatment, with tumor recurrence as microdisseminated disease. Epidermal growth factor receptors (EGFRs), integrins and their ligands in the extracellular matrix (ECM) predominantly participate in the invasion process, including the cell adhesion to the surrounding microenvironment and cell migration. The extent of infiltration of the surrounding brain tissue by malignant tumors strongly depends on the tumor cell type. Malignant gliomas show much more intensive peritumoral invasion than do metastatic tumors. In this study, the mRNA expression of 29 invasion-related molecules (18 cell membrane receptors or receptor subunits (EGFRs and integrins) and 11 ECM components: collagens, laminins and fibronectin) was investigated by quantitative reverse transcriptase-polymerase chain reaction. Fresh frozen human tissue samples from glioblastoma (GBM) and intracerebral bronchial adenocarcinoma metastases (five pieces from each) were evaluated. Significant differences were established in six of the 29 molecules (ErbB1, 2, 3, integrins alpha3, 7 and beta1). To confirm our results at the protein level, immunohistochemical analysis of nine molecules was performed. The staining intensity differed definitely in the case of ErbB1, 2 and integrins alpha3 and beta1. Determining the differences in invasion-related molecules in tumors of different origin can help identify the exact molecular mechanisms that facilitate peritumoral infiltration by glioblastoma cells. These results should allow the selection of target molecules for potential chemotherapeutic agents directed against highly invasive malignant gliomas.
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Affiliation(s)
- Miklós Petrás
- Debreceni Egyetem Orvos- és Egészségtudományi Centrum Idegsebészeti Klinika, Debrecen
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15
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Balogh A, Paragh G, Juhász A, Köbling T, Törocsik D, Mikó E, Varga V, Emri G, Horkay I, Scholtz B, Remenyik E. Reference genes for quantitative real time PCR in UVB irradiated keratinocytes. J Photochem Photobiol B 2008; 93:133-9. [PMID: 18789713 DOI: 10.1016/j.jphotobiol.2008.07.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2008] [Revised: 07/25/2008] [Accepted: 07/31/2008] [Indexed: 11/18/2022]
Abstract
Real time quantitative reverse transcription-polymerase chain reaction (qRT-PCR) is a sensitive and highly reproducible method often used for determining mRNA levels. To enable proper comparison of gene expression genes expressed at stabile levels within the cells in the studied experimental system need to be identified and used as reference. Ultraviolet B (UVB) radiation is an exogenous carcinogenic stimulus in keratinocytes, and UVB elicited changes have extensively been studied by qRT-PCR, yet a comparison of commonly used reference genes in UVB treatment is lacking. To find the best genes for compensating slight inter-sample variations in keratinocytes in UVB experiments and to understand the potential effects of improper reference gene (RG) selection we have analyzed the mRNA expression of 10 housekeeping genes in neonatal human epidermal keratinocytes (NHEK) after UVB treatment. The biological effect of the used UVB light source was validated by trypane blue exclusion, MTT and comet assays. 20-40mJ/cm(2) dose was chosen for the experiments. The stability of the 10 RGs was assessed by the GeNorm and Normfinder software tools. Regardless of their slightly different algorithm the programs found succinate dehydrogenase complex subunit A (SDHA) to be the best individual RG and SDHA and phosphoglycerate kinase-1 (PGK1) as the most suitable combination. Analysis of the expression of tumor necrosis factor alpha (TNFalpha) and vascular endothelial growth factor (VEGF) found that while the perception of changes in TNF-alpha, a gene undergoing marked upregulation after UVB irradiation is independent of the used RG, changes seen in the more modestly upregulated VEGF are greatly effected by reference gene selection. These findings highlight the importance of reference gene selection in UVB irradiation experiments, and provide evidence that using SDHA or the combination of SDHA and PGK1 as standards could be a reliable method for normalizing qRT-PCR results in keratinocytes after UVB treatment.
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Affiliation(s)
- Attila Balogh
- Department of Dermatology, Medical and Health Science Center, University of Debrecen, Debrecen, Hungary Nagyerdei Körut 98, H-4032 Debrecen, Hungary
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16
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Kiss I, Oskolás H, Tóth R, Bouillet P, Tóth K, Fülöp A, Scholtz B, Ledent C, Fésüs L, Szondy Z. Adenosine A2A receptor-mediated cell death of mouse thymocytes involves adenylate cyclase and Bim and is negatively regulated by Nur77. Eur J Immunol 2006; 36:1559-71. [PMID: 16673448 DOI: 10.1002/eji.200535334] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Adenosine is generated in the microenvironment of emerging thymocytes through normal mechanisms of lymphocyte selection. In a normal thymus, most of the adenosine is catabolized by adenosine deaminase; however, in an environment where up to 95% of the cells undergo programmed cell death, a sufficient amount of adenosine is accumulated to trigger cell surface adenosine receptors. Here we show that accumulated adenosine can induce apoptosis in immature mouse thymocytes, mostly via adenosine A(2A) receptors. The signaling pathway is coupled to adenylate cyclase activation, induction of the Nur77 transcription factor, Nur77-dependent genes, such as Fas ligand and TRAIL, and the pro-apoptotic BH3-only protein Bim. We analyzed several knockout and transgenic mouse lines and found that adenosine-induced killing of mouse thymocytes requires Bim, occurs independently of "death receptor" signaling and is inhibited by Bcl-2 and Nur77. Collectively our data demonstrate that adenosine-induced cell death involves signaling pathways originally found in negative selection of thymocytes and suggest a determining role of Bim and a regulatory role for Nur77.
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MESH Headings
- Adenosine/immunology
- Adenylyl Cyclases/immunology
- Animals
- Apoptosis/drug effects
- Apoptosis/immunology
- BH3 Interacting Domain Death Agonist Protein/genetics
- BH3 Interacting Domain Death Agonist Protein/immunology
- Blotting, Western
- Cyclic AMP/immunology
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/immunology
- Fas Ligand Protein
- Male
- Membrane Glycoproteins/immunology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Nuclear Receptor Subfamily 4, Group A, Member 1
- Proto-Oncogene Proteins c-bcl-2/immunology
- RNA, Messenger/chemistry
- RNA, Messenger/genetics
- Receptor, Adenosine A2A/immunology
- Receptors, Cytoplasmic and Nuclear/genetics
- Receptors, Cytoplasmic and Nuclear/immunology
- Receptors, Steroid/genetics
- Receptors, Steroid/immunology
- Reverse Transcriptase Polymerase Chain Reaction
- T-Lymphocytes/cytology
- T-Lymphocytes/enzymology
- T-Lymphocytes/immunology
- Transcription Factors/genetics
- Transcription Factors/immunology
- Tumor Necrosis Factors/immunology
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Affiliation(s)
- Ildikó Kiss
- Department of Biochemistry and Molecular Biology, Signaling and Apoptosis Research Group, Hungarian Academy of Sciences, Research Center of Molecular Medicine, University of Debrecen
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17
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Smithgall TE, Rogers JA, Peters KL, Li J, Briggs SD, Lionberger JM, Cheng H, Shibata A, Scholtz B, Schreiner S, Dunham N. The c-Fes family of protein-tyrosine kinases. Crit Rev Oncog 1998; 9:43-62. [PMID: 9754447 DOI: 10.1615/critrevoncog.v9.i1.40] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The human c-fes protooncogene encodes a protein-tyrosine kinase (c-Fes) distinct from c-Src, c-Abl and other nonreceptor tyrosine kinases. Although originally identified as the cellular homolog of several transforming retroviral oncoproteins, Fes was later found to exhibit strong expression in myeloid hematopoietic cells and to play a direct role in their differentiation. Recent work has shown that Fes exhibits a more widespread expression pattern in both developing and adult tissues, suggesting a general physiological function for this kinase and its closely related homolog, Fer. This review highlights the unique aspects of Fes structure, regulation, and function that set it apart from other tyrosine kinase families.
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Affiliation(s)
- T E Smithgall
- Eppley Institute for Research in Cancer, University of Nebraska Medical Center, Omaha 68198-6805, USA
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18
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Kingsley-Kallesen M, Johnson L, Scholtz B, Kelly D, Rizzino A. Transcriptional regulation of the TGF-beta 2 gene in choriocarcinoma cells and breast carcinoma cells: differential utilization of Cis-regulatory elements. In Vitro Cell Dev Biol Anim 1997; 33:294-301. [PMID: 9156346 DOI: 10.1007/s11626-997-0050-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Previous studies have shown that the transcription of the TGF-beta 2 gene is controlled by at least one negative and two positive regulatory regions in differentiated cells derived from both embryonal carcinoma cells and embryonic stem cells. The use of TGF-beta 2 promoter/reporter gene constructs has also identified a CRE/ATF motif near the TATA box that appears to heavily influence the transcription of the TGF-beta 2 gene. In this study, two choriocarcinoma cell lines, JAR and JEG-3, and the breast cancer cell line, MCF-7, were used to determine whether differences exist in the transcriptional regulation of the TGF-beta 2 gene. We demonstrated that both similarities and differences exist in the transcriptional regulation of this gene. Common to all cells examined to date, the positive regulatory region just upstream of the TATA box contains an essential CRE/ATF motif that binds at least one transcription factor, ATF-1, in gel mobility shift assays. However, we did not detect ATF-2 binding to this site with any of the nuclear extracts used. We also determined that the effect of the region between -187 and -78 (relative to the transcription start site) is cell type dependent. Previous studies have shown that this region acts to reduce the activity of the TGF-beta 2 promoter in differentiated cells derived from embryonal carcinoma cells and embryonic stem cells. In direct contrast, this region acts as a strong positive regulatory region in JAR, JEC-3, and MCF-7 cells. The mechanisms responsible for these differing effects remain to be established. Interestingly, this region does not appear to contain sequence motifs that bind known transcription factors. Thus, this region is likely to bind one or more novel transcription factors or contain novel recognition sites for known transcription factors.
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Affiliation(s)
- M Kingsley-Kallesen
- Eppley Institute for Research in Cancer and Allied Diseases, Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha 68198-6805, USA
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19
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Scholtz B, Kingsley-Kallesen M, Rizzino A. Transcription of the transforming growth factor-beta2 gene is dependent on an E-box located between an essential cAMP response element/activating transcription factor motif and the TATA box of the gene. J Biol Chem 1996; 271:32375-80. [PMID: 8943301 DOI: 10.1074/jbc.271.50.32375] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Transforming growth factor-beta2 (TGF-beta2) is an important regulator of cell proliferation and differentiation; however, its transcriptional regulation is not well understood. Here we report characterization of an essential E-box motif, positioned at -50/-45 between a previously described functional cAMP response element/activating transcription factor site and the TATA box of the human TGF-beta2 promoter. By site-directed mutagenesis, we demonstrate that this E-box motif is necessary for the promoter activity, not only in differentiated cells derived from embryonal carcinoma cells, but also in choriocarcinoma cells and in MCF-7 breast carcinoma cells. We also demonstrate that the transcription factors USF1 and USF2 bind to this E-box motif in vitro when nuclear extracts from each of these cell lines are examined by gel retardation assays. Moreover, using a dominant-negative USF2 protein, we show that USF proteins are critical for TGF-beta2 promoter activity in vivo. The importance of the E-box motif described in this study is supported by the presence of an E-box motif in the same position in the chicken TGF-beta2 gene promoter.
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Affiliation(s)
- B Scholtz
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-6805, USA.
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20
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Abstract
Proteolytic systems are involved via multiple mechanisms in the regulation of gene expression, including tightly controlled metabolism of transcription factors. In this study, we demonstrate that differentiation of mouse embryonal carcinoma cells to parietal endoderm-like cells is accompanied by the appearance of nuclear protease activity. Interestingly, this nuclear-associated protease activity is not observed in the visceral endoderm-like cell line, PSA-5E, or in the differentiated cells derived from both mouse embryonic stem cells and the human embryonal carcinoma cell line NT2/D1. We also determined that this differentiation-associated nuclear protease activity causes proteolysis of a wide range of different transcription factors, including ATF-1, Sp1, NF-YA and B, and octamer-binding proteins Oct-1 and Oct-3. Based on the effects of specific inhibitors, the nuclear protease(s) can be classified as a cysteine protease; however, lack of inhibition by calpastatin and EGTA distinguishes this protease activity from the calpain family of proteases. Given the properties of the differentiation-associated nuclear protease(s), we discuss the possibility that this protease(s) plays a role in the metabolism of transcription factors during the differentiation of specific embryonic cells.
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Affiliation(s)
- B Scholtz
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha 68198-6805, USA
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21
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Abstract
Phosphorylation influences DNA binding and transactivator capabilities of multiple transcription factors. In this study, we demonstrate that the POU-domain transcription factor, Oct-3, can be phosphorylated in vivo. In addition, we show that in COS-1 cells Oct-3 is phosphorylated exclusively on serine residues. Lastly, we provide evidence that phosphorylation is not required for Oct-3 binding to DNA and treatment of Oct-3 with calf intestinal alkaline phosphatase does not influence its ability to bind DNA.
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Affiliation(s)
- E Rosfjord
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha 68198-6805, USA
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22
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Scholtz B, Kelly D, Rizzino A. Cis-regulatory elements and transcription factors involved in the regulation of the transforming growth factor-beta 2 gene. Mol Reprod Dev 1995; 41:140-8. [PMID: 7654367 DOI: 10.1002/mrd.1080410204] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Embryonal carcinoma (EC) cells and embryonic stem (ES) cells provide useful model systems for studying differentiation during early mammalian development. Previous studies have demonstrated that differentiation of two restricted mouse EC cell lines is accompanied by activation of the TGF-beta 2 gene. Moreover, one negative and two positive regulatory regions upstream of the transcription start site were identified, which appear to play key roles in the transcriptional regulation of the human TGF-beta 2 gene. In this report, we demonstrate that the same three regulatory regions strongly influence the activity of the TGF-beta 2 promoter in differentiated cells derived from the multipotent human EC cell line, NT2/D1, and from the murine totipotent ES cell line, CCE. We also determined that the same three regions are active in the regulation of the TGF-beta 2 gene in the murine parietal endoderm-like cell line, PYS-2. However, an additional negative regulatory region appears to contribute to the regulation of the TGF-beta 2 gene in PYS-2 cells. Last, mutation of a CRE/ATF element located just upstream of the transcription start site of the TGF-beta 2 gene reduces significantly the activity of the TGF-beta 2 promoter in the differentiated cells. However, in contrast to our previous findings, our gel mobility shift analyses demonstrate that this CRE/ATF element is bound by similar proteins in nuclear extracts prepared from undifferentiated and differentiated mouse EC cells as well as from undifferentiated human EC cells.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- B Scholtz
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha 68198-6805, USA
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23
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Kelly D, Scholtz B, Orten DJ, Hinrichs SH, Rizzino A. Regulation of the transforming growth factor-beta 2 gene promoter in embryonal carcinoma cells and their differentiated cells: differential utilization of transcription factors. Mol Reprod Dev 1995; 40:135-45. [PMID: 7766406 DOI: 10.1002/mrd.1080400202] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Previous studies demonstrated that differentiation of embryonal carcinoma (EC) cells increases the expression of the TGF-beta 2 gene and identified a CRE/ATF-like motif in the TGF-beta 2 promoter that is necessary for its activity. This suggested that differentiation may increase the transcription of this gene by differential binding of transcription factors to the CRE/ATF-like motif. To test this possibility, we performed gel mobility shift analysis using double-stranded oligodeoxynucleotides containing the TGF-beta 2 CRE/ATF-like motif and nuclear extracts prepared from F9 EC cells and F9-differentiated cells. We determined that the DNA/protein complexes formed by the EC nuclear extracts, but not the complexes formed by differentiated cell nuclear extracts, are recognized and supershifted by an ATF-1 specific antibody. This observation is consistent with our Western immunoblot analysis that detects AFT-1 in the EC cells, but not in their differentiated counterparts. In addition, we provide evidence that protein phosphorylation influences the formation of complexes between F9 nuclear proteins and the CRE/ATF-like motif. Together, our studies identify a likely role for the CRE/ATF-like motif in the regulation of TGF-beta 2 and suggest that this site binds one set of nuclear proteins in EC cells, where the gene is not expressed, and a different set of nuclear proteins in the differentiated cells, where the gene is expressed.
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Affiliation(s)
- D Kelly
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha 68198-6805, USA
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