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Salamon D, Kowalska-Duplaga K, Krawczyk A, Duplaga M, Gurgul A, Gosiewski T. Are there new biomarkers of the gastroduodenal microbiota useful in the diagnosis of coeliac disease in children? A pilot study. Benef Microbes 2024; 15:165-177. [PMID: 38653476 DOI: 10.1163/18762891-bja00009] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 03/27/2024] [Indexed: 04/25/2024]
Abstract
The changing of microbiome could precede the development of coeliac disease (CeD). We compared the bacterial profile of microbiota of tissues collected simultaneously from the stomach and duodenum in newly diagnosed patients with CeD. Biopsies were collected from 60 children and adolescents aged 2-18 years: (1) 40 patients with CeD; (2) 20 children as control group. The evaluation of the bacterial microbiota was carried out by sequencing the V3-V4 regions of the 16S rRNA subunit, using next-generation sequencing (NGS). The composition of bacterial microbiota was correlated with clinical and blood parameters. The beta diversity analysis revealed a significant dissimilarity in the gastric samples between the CeD and control group (Bray-Curtis index, P = 0.008, and weighted UniFrac distance, P = 0.024). At L2 (phylum level), Campylobacterota was only present in the stomach of the CeD group. A comparison of the abundance of bacteria between the stomach and duodenum showed significant differences in 10 OTUs (operational taxonomic units) in the control and 9 OTUs in the CeD group at L6 (genus) and in 8 OTUs and in 6 OTUs, respectively, at L7 (species). A significant correlation was observed between the genus Novosphingobium in stomach of CeD group and possession of the DQ2.5 and DQ 8 allele, and in the duodenum - between the DQ 8 allele and the species Blautia wexlerae. Significant differences in selected, little-known genera of bacteria suggest their potential role as new biomarkers in the development of CeD. To fully understand the mechanism of CeD development in genetically predisposed individuals, it is necessary to take into account not only the abundance of a given genus or species of bacteria, but also the anatomical location of its occurrence.
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Affiliation(s)
- D Salamon
- Department of Molecular Medical Microbiology, Division of Microbiology, Faculty of Medicine, 49573Jagiellonian University Medical College, ul. Czysta 18, 31-121 Krakow, Poland
| | - K Kowalska-Duplaga
- Department of Pediatrics, Gastroenterology and Nutrition, Faculty of Medicine, 49573Jagiellonian University Medical College, ul. Wielicka 265, 30-663 Krakow, Poland
| | - A Krawczyk
- Department of Molecular Medical Microbiology, Division of Microbiology, Faculty of Medicine, 49573Jagiellonian University Medical College, ul. Czysta 18, 31-121 Krakow, Poland
| | - M Duplaga
- Department of Health Promotion and e-Health, Institute of Public Health, Faculty of Health Sciences, 49573Jagiellonian University Medical College, ul. Skawińska 8, 31-066 Krakow, Poland
| | - A Gurgul
- Center for Experimental and Innovative Medicine, 49563University of Agriculture in Krakow, ul. Rędzina 1c, 30-248, Krakow, Poland
| | - T Gosiewski
- Microbiome Research Laboratory, Department of Molecular Medical Microbiology, Division of Microbiology, Faculty of Medicine, 49573Jagiellonian University Medical College, ul. Czysta 18, 31-121 Krakow, Poland
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Krawczyk A, Gosiewski T, Zapała B, Kowalska-Duplaga K, Salamon D. Alterations in intestinal Archaea composition in pediatric patients with Crohn's disease based on next-generation sequencing - a pilot study. Gut Microbes 2023; 15:2276806. [PMID: 37955638 PMCID: PMC10653639 DOI: 10.1080/19490976.2023.2276806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 10/25/2023] [Indexed: 11/14/2023] Open
Abstract
Intestinal dysbiosis can lead to the induction of systemic immune-mediated inflammatory diseases, such as Crohn's disease Although archaea are part of the commensal microbiota, they are still one of the least studied microorganisms. The aim of our study was the standardization of the optimal conditions and primers for sequencing of the gut archaeome using Next Generation Sequencing, and evaluation of the differences between the composition of archaea in patients and healthy volunteers, as well as analysis of the changes that occur in the archaeome of patients depending on disease activity. Newly diagnosed patients were characterized by similar archeal profiles at every taxonomic level as in healthy individuals (the dominance of Methanobacteria at the class level, and Methanobrevibacter at the genus level). In turn, in patients previously diagnosed with Crohn's disease (both in active and remission phase), an increased prevalence of Thermoplasmata, Thermoprotei, Halobacteria (at the class level), and Halococcus, Methanospaera or Picrophilus (at the genus level) were observed. Furthermore, we have found a significant correlation between the patient's parameters and the individual class or species of Archaea. Our study confirms changes in archaeal composition in pediatric patients with Crohn's disease, however, only in long-standing disease. At the beginning of the disease, the archeal profile is similar to that of healthy people. However, in the chronic form of the disease, significant differences in the composition of archaeome begin to appear. It seems that some archaea may be a good indicator of the chronicity and activity of Crohn's disease.
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Affiliation(s)
- A. Krawczyk
- Department of Molecular Medical Microbiology, Division of Microbiology, Jagiellonian University Medical College, Krakow, Poland
| | - T. Gosiewski
- Department of Molecular Medical Microbiology, Division of Microbiology, Jagiellonian University Medical College, Krakow, Poland
| | - B. Zapała
- Department of Pharmaceutical Microbiology, Jagiellonian University Medical College, Krakow, Poland
- Jagiellonian University Hospital in Krakow, Krakow, Poland
| | - K. Kowalska-Duplaga
- Department of Pediatrics, Gastroenterology and Nutrition,Jagiellonian University Medical College, Krakow, Poland
| | - D. Salamon
- Department of Molecular Medical Microbiology, Division of Microbiology, Jagiellonian University Medical College, Krakow, Poland
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Madapura HS, Nagy N, Ujvari D, Kallas T, Kröhnke MCL, Amu S, Björkholm M, Stenke L, Mandal PK, McMurray JS, Keszei M, Westerberg LS, Cheng H, Xue F, Klein G, Klein E, Salamon D. Interferon γ is a STAT1-dependent direct inducer of BCL6 expression in imatinib-treated chronic myeloid leukemia cells. Oncogene 2017; 36:4619-4628. [PMID: 28368400 DOI: 10.1038/onc.2017.85] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 01/20/2017] [Accepted: 02/26/2017] [Indexed: 01/12/2023]
Abstract
B-cell CLL/lymphoma 6 (BCL6) exerts oncogenic effects in several human hematopoietic malignancies including chronic myeloid leukemia (CML), where BCL6 expression was shown to be essential for CML stem cell survival and self-renewal during imatinib mesylate (IM) treatment. As several lines of evidence suggest that interferon γ (IFNγ) production in CML patients might have a central role in the response to tyrosine kinase inhibitor (TKI) therapy, we analyzed if IFNγ modulates BCL6 expression in CML cells. Although separate IFNγ or IM treatment only slightly upregulated BCL6 expression, combined treatment induced remarkable BCL6 upregulation in CML lines and primary human CD34+ CML stem cells. We proved that during combined treatment, inhibition of constitutive signal transducer and activator of transcription (STAT) 5 activation by IM allowed the specific enhancement of the STAT1 dependent, direct upregulation of BCL6 by IFNγ in CML cells. By using colony-forming assay, we found that IFNγ enhanced the ex vivo colony or cluster-forming capacity of human CML stem cells in the absence or presence of IM, respectively. Furthermore, inhibition of the transcriptional repressor function of BCL6 in the presence of IM and IFNγ almost completely blocked the cluster formation of human CML stem cells. On the other hand, by using small interfering RNA knockdown of BCL6, we demonstrated that in an IM-treated CML line the antiapoptotic effect of IFNγ was independent of BCL6 upregulation. We found that IFNγ also upregulated several antiapoptotic members of the BCL2 and BIRC gene families in CML cells, including the long isoform of MCL1, which proved to be essential for the antiapoptotic effect of IFNγ in an IM-treated CML line. Our results suggest that combination of TKIs with BCL6 and MCL1 inhibitors may potentially lead to the complete eradication of CML stem cells.
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Affiliation(s)
- H S Madapura
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - N Nagy
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - D Ujvari
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - T Kallas
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - M C L Kröhnke
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - S Amu
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - M Björkholm
- Division of Hematology, Department of Medicine, Karolinska University Hospital Solna and Karolinska Institutet, Stockholm, Sweden
| | - L Stenke
- Division of Hematology, Department of Medicine, Karolinska University Hospital Solna and Karolinska Institutet, Stockholm, Sweden
| | - P K Mandal
- Department of Experimental Therapeutics, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - J S McMurray
- Department of Experimental Therapeutics, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - M Keszei
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - L S Westerberg
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - H Cheng
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, USA
| | - F Xue
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, USA
| | - G Klein
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - E Klein
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - D Salamon
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.,Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
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Gosiewski T, Ludwig-Galezowska AH, Huminska K, Sroka-Oleksiak A, Radkowski P, Salamon D, Wojciechowicz J, Kus-Slowinska M, Bulanda M, Wolkow PP. Comprehensive detection and identification of bacterial DNA in the blood of patients with sepsis and healthy volunteers using next-generation sequencing method - the observation of DNAemia. Eur J Clin Microbiol Infect Dis 2016; 36:329-336. [PMID: 27771780 PMCID: PMC5253159 DOI: 10.1007/s10096-016-2805-7] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 09/26/2016] [Indexed: 12/17/2022]
Abstract
Blood is considered to be a sterile microenvironment, in which bacteria appear only periodically. Previously used methods allowed only for the detection of either viable bacteria with low sensitivity or selected species of bacteria. The Next-Generation Sequencing method (NGS) enables the identification of all bacteria in the sample with their taxonomic classification. We used NGS for the analysis of blood samples from healthy volunteers (n = 23) and patients with sepsis (n = 62) to check whether any bacterial DNA exists in the blood of healthy people and to identify bacterial taxonomic profile in the blood of septic patients. The presence of bacterial DNA was found both in septic and healthy subjects; however, bacterial diversity was significantly different (P = 0.002) between the studied groups. Among healthy volunteers, a significant predominance of anaerobic bacteria (76.2 %), of which most were bacteria of the order Bifidobacteriales (73.0 %), was observed. In sepsis, the majority of detected taxa belonged to aerobic or microaerophilic microorganisms (75.1 %). The most striking difference was seen in the case of Actinobacteria phyla, the abundance of which was decreased in sepsis (P < 0.001) and Proteobacteria phyla which was decreased in the healthy volunteers (P < 0.001). Our research shows that bacterial DNA can be detected in the blood of healthy people and that its taxonomic composition is different from the one seen in septic patients. Detection of bacterial DNA in the blood of healthy people may suggest that bacteria continuously translocate into the blood, but not always cause sepsis; this observation can be called DNAemia.
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Affiliation(s)
- T Gosiewski
- Department of Microbiology, Jagiellonian University Medical College, Krakow, Poland
| | - A H Ludwig-Galezowska
- Center for Medical Genomics OMICRON, Jagiellonian University Medical College, 7C Kopernika Str., 31-034, Krakow, Poland
| | - K Huminska
- Genomic Laboratory, DNA Research Center, Poznan, Poland.,Laboratory of High Throughput Technologies, Institute of Molecular Biology and Biotechnology, Faculty of Biology, Adam Mickiewicz University, Poznan, Poland
| | - A Sroka-Oleksiak
- Department of Microbiology, Jagiellonian University Medical College, Krakow, Poland
| | - P Radkowski
- Center for Medical Genomics OMICRON, Jagiellonian University Medical College, 7C Kopernika Str., 31-034, Krakow, Poland
| | - D Salamon
- Department of Microbiology, Jagiellonian University Medical College, Krakow, Poland
| | | | | | - M Bulanda
- Department of Microbiology, Jagiellonian University Medical College, Krakow, Poland
| | - P P Wolkow
- Center for Medical Genomics OMICRON, Jagiellonian University Medical College, 7C Kopernika Str., 31-034, Krakow, Poland.
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Niller HH, Salamon D, Rahmann S, Ilg K, Koroknai A, Bánáti F, Schwarzmann F, Wolf H, Minárovits J. A 30 kb region of the Epstein-Barr virus genome is colinear with the rearranged human immunoglobulin gene loci: implications for a "ping-pong evolution" model for persisting viruses and their hosts. A review. Acta Microbiol Immunol Hung 2004; 51:469-84. [PMID: 15704335 DOI: 10.1556/amicr.51.2004.4.7] [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: 11/19/2022]
Abstract
The left part of the Epstein-Barr virus (EBV) genome exhibits a strong colinearity of structural and functional elements with the immunoglobulin (Ig) gene loci which is only partially reflected in nucleotide sequence homologies. We propose that this colinearity may be the result of an inter-dependent co-evolution of the immunoglobulin loci together with EBV. Our observation could help elucidating the mechanisms of somatic hypermutation, explaining the ability of EBV to accidentally cause tumors, and shedding more light on the general mechanisms of viral and organismal evolution. We suggest that persisting viruses served as a complement for the organismal germline like in a ping-pong game and outline The Ping-Pong Evolution Hypothesis.
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Affiliation(s)
- H H Niller
- Institute for Medical Microbiology and Hygiene, University of Regensburg, Research Center, Landshuter Str. 22, D-93047 Regensburg, Germany.
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6
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Speer G, Tóth M, Niller HH, Salamon D, Takács I, Miheller P, Patócs A, Nagy Z, Bajnok E, Nyiri P, Lakatos P. Calcium Metabolism and Endocrine Functions in a Family with Familial Hypocalciuric Hypercalcemia. Exp Clin Endocrinol Diabetes 2004; 111:486-90. [PMID: 14714270 DOI: 10.1055/s-2003-44708] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
OBJECTIVE We report two Hungarian patients with familial hypocalciuric hypercalcemia (FHH) caused by a mutation of the calcium-sensing receptor (CaSR) at codon 55. The proband and her father were heterozygous for this mutation. DESIGN We performed detailed clinical and laboratory assessments of this family to characterize the effects of CaSR mutation on several endocrine organs expressing CaSR. RESULTS Interestingly, we could not detect any failure in the function of any tissues we examined, except in serum calcium levels. CONCLUSIONS To our knowledge, this has been the first report from Eastern and Central Europe showing P55 L mutation of the CaSR, as well as the first publication discussing the effect of this mutation on several endocrine systems containing CASR.
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Affiliation(s)
- G Speer
- 1st Department of Medicine, Faculty of Medicine, Semmelweis University, Budapest, Korányi 2/a, 1083, Hungary.
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Niller HH, Salamon D, Takacs M, Uhlig J, Wolf H, Minarovits J. Protein-DNA interaction and CpG methylation at rep*/vIL-10p of latent Epstein-Barr virus genomes in lymphoid cell lines. Biol Chem 2001; 382:1411-9. [PMID: 11727824 DOI: 10.1515/bc.2001.174] [Citation(s) in RCA: 10] [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: 11/15/2022]
Abstract
The viral interleukin-10 promoter (vIL-10p), overlapping the rep* element in the Epstein-Barr virus (EBV) genome, is a promoter element active mostly in the late phase of the lytic cycle and immediately upon infection of B cells. rep* was, through transfection experiments with small plasmids, characterised as a cis element supporting oriP replicative function. In this study, in vivo protein binding and CpG methylation at rep*/vIL-10p were analysed in five cell lines that harbour strictly latent EBV genomes. Contrary to the invariably unmethylated dyad symmetry element (DS) of oriP, rep*/vIL-10p was highly methylated and showed only traces of protein binding in all examined cell lines. This result is in agreement with vIL-10p being an inactive promoter of EBV genomes, and makes it less likely that rep* functions as a replicative element of latent EBV genomes.
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Affiliation(s)
- H H Niller
- Institut für Medizinische Mikrobiologie und Hygiene, Universität Regensburg, Germany
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Takacs M, Salamon D, Myöhänen S, Li H, Segesdi J, Ujvari D, Uhlig J, Niller HH, Wolf H, Berencsi G, Minarovits J. Epigenetics of latent Epstein-Barr virus genomes: high resolution methylation analysis of the bidirectional promoter region of latent membrane protein 1 and 2B genes. Biol Chem 2001; 382:699-705. [PMID: 11405234 DOI: 10.1515/bc.2001.083] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [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: 11/15/2022]
Abstract
We analysed the methylation patterns of CpG dinucleotides in a bidirectional promoter region (LRS, LMP 1 regulatory sequences) of latent Epstein-Barr virus (EBV) genomes using automated fluorescent genomic sequencing after bisulfite-induced modification of DNA. Transcripts for two latent membrane proteins, LMP 1 (a transforming protein) and LMP 2B, are initiated in this region in opposite directions. We found that B cell lines and a clone expressing LMP 1 carried EBV genomes with unmethylated or hypomethylated LRS, while highly methylated CpG dinucleotides were present at each position or at discrete sites and within hypermethylated regions in LMP 1 negative cells. Comparison of high resolution methylation maps suggests that CpG methylation-mediated direct interference with binding of nuclear factors LBF 2, 3, 7, AML1/LBF1, LBF5 and LBF6 or methylation of CpGs within an E-box sequence (where activators as well as repressors can bind) is not the major mechanism in silencing of the LMP 1 promoter. Although a role for CpG methylation within binding sites of Sp1 and 3, ATF/CRE and a sis-inducible factor (SIF) cannot be excluded, hypermethylation of LRS or regions within LRS in LMP 1 negative cells suggests a role for an indirect mechanism, via methylcytosine binding proteins, in silencing of the LMP 1 promoter.
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Affiliation(s)
- M Takacs
- Division of Virology, National Center for Epidemiology, Budapest, Hungary
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Salamon D, Takacs M, Ujvari D, Uhlig J, Wolf H, Minarovits J, Niller HH. Protein-DNA binding and CpG methylation at nucleotide resolution of latency-associated promoters Qp, Cp, and LMP1p of Epstein-Barr virus. J Virol 2001; 75:2584-96. [PMID: 11222681 PMCID: PMC115881 DOI: 10.1128/jvi.75.6.2584-2596.2001] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [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: 11/20/2022] Open
Abstract
Epstein-Barr viral (EBV) latency-associated promoters Qp, Cp, and LMP1p are crucial for the regulated expression of the EBNA and LMP transcripts in dependence of the latency type. By transient transfection and in vitro binding analyses, many promoter elements and transcription factors have previously been shown to be involved in the activities of these promoters. However, the latency promoters have only partially been examined at the nucleotide level in vivo. Therefore, we undertook a comprehensive analysis of in vivo protein binding and CpG methylation patterns at these promoters in five representative cell lines and correlated the results with the known in vitro binding data and activities of these promoters from previous transfection experiments. Promoter activity inversely correlated with the methylation state of promoters, although Qp was a remarkable exception. Novel protein binding data were obtained for all promoters. For Cp, binding correlated well with promoter activity; for LMP1p and Qp, binding patterns looked similar regardless of promoter activity.
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Affiliation(s)
- D Salamon
- Microbiological Research Group, National Center for Epidemiology, H-1529 Budapest, Hungary
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Speer G, Dworak O, Cseh K, Bori Z, Salamon D, Török I, Winkler G, Vargha P, Nagy Z, Takács I, Kucsera M, Lakatos P. Vitamin D receptor gene BsmI polymorphism correlates with erbB-2/HER-2 expression in human rectal cancer. Oncology 2000; 58:242-7. [PMID: 10765127 DOI: 10.1159/000012107] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [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: 12/19/2022]
Abstract
Apart from the regulation of calcium metabolism, 1, 25-dihydroxyvitamin D(3) plays an essential role in cell proliferation and differentiation in several tissues. The vitamin D receptor (VDR) gene shows polymorphisms in humans that appear to be clinically significant in some pathological conditions. In the present study, the BsmI polymorphism of the VDR gene was studied in 59 Caucasian patients with rectal cancer (mean follow-up: 48 months). The relationship between VDR genotypes and the expression of oncogenes as well as their influence on survival were also investigated. VDR polymorphism was examined in tumor and normal mucosa cells by PCR technique. The expression of erbB-2/HER-2, p53, ras and epidermal growth factor receptor (EGFR) was also detected by immunohistochemistry and protein blotting. The presence of the VDR B allele significantly correlated with the overexpression of the erbB-2 oncogene. There was no difference in the VDR genotype between cancer and normal mucosal cells. Coexpression of erbB-2, pan-ras, p53 and EGFR internal and external domains was significantly higher in cancer cells than in normal mucosa. There was no significant correlation between VDR genotypes and age, gender, tumor infiltration depth, number and site of lymph node metastases and lymphatic or blood vessel infiltration. The VDR genotype alone did not influence survival. Overexpression of erbB-2 and EGFR was associated with a poor prognosis. In patients expressing only one oncogene in cancer cells, the presence of the VDR B allele showed a tendency to a poor prognosis. In conclusion, VDR gene BsmI polymorphism might affect the development and prognosis of rectal cancer by influencing erbB-2 oncogene expression.
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Affiliation(s)
- G Speer
- First Departments of Medicine, Semmelweis University Medical School, St. John's Hospital Budapest, Hungary
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11
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Salamon D, Takacs M, Myöhänen S, Marcsek Z, Berencsi G, Minarovits J. De novo DNA methylation at nonrandom founder sites 5' from an unmethylated minimal origin of DNA replication in latent Epstein-Barr virus genomes. Biol Chem 2000; 381:95-105. [PMID: 10746740 DOI: 10.1515/bc.2000.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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: 12/26/2022]
Abstract
Latent episomal genomes of Epstein-Barr virus, a human gammaherpesvirus, represent a suitable model system for studying replication and methylation of chromosomal DNA in mammals. We analyzed the methylation patterns of CpG dinucleotides in the latent origin of DNA replication of Epstein-Barr virus using automated fluorescent genomic sequencing of bisulfite-modified DNA samples. We observed that the minimal origin of DNA replication was unmethylated in 8 well-characterized human cell lines or clones carrying latent Epstein-Barr virus genomes as well as in a prototype virus producer marmoset cell line. This observation suggests that unmethylated DNA domains can function as initiation sites or zones of DNA replication in human cells. Furthermore, 5' from this unmethylated region we observed focal points of de novo DNA methylation in nonrandom positions in the majority of Burkitt's lymphoma cell lines and clones studied while the corresponding CpG dinucleotides in viral genomes carried by lymphoblastoid cell lines and marmoset cells were completely unmethylated. Clustering of highly methylated CpG dinucleotides suggests that de novo methylation of unmethylated double-stranded episomal viral genomes starts at discrete founder sites in vivo. This is the first comparative high-resolution methylation analysis of a latent viral origin of DNA replication in human cells.
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Affiliation(s)
- D Salamon
- 2nd Department of Pathology, Semmelweis University of Medicine, Budapest, Hungary
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12
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Winkler G, Salamon F, Harmos G, Salamon D, Speer G, Szekeres O, Hajós P, Kovács M, Simon K, Cseh K. Elevated serum tumor necrosis factor-alpha concentrations and bioactivity in Type 2 diabetics and patients with android type obesity. Diabetes Res Clin Pract 1998; 42:169-74. [PMID: 9925347 DOI: 10.1016/s0168-8227(98)00109-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The role of tumor necrosis factor-alpha in insulin resistance has been studied in 59 patients with Type 2 diabetes, 28 with android type obesity and 35 healthy lean controls. Immunoreactive concentrations and bioactivity of serum tumor necrosis factor-alpha have repeatedly been determined in 8 weeks intervals for 12 months, five times per patients, by using ELISA and L929 cell cytotoxicity bioassay. Significantly higher immunoreactive tumor necrosis factor-alpha concentrations and bioactivity have been found in both, the Type 2 diabetic and obese groups as compared to the healthy persons. Tumor necrosis factor-alpha concentrations and bioactivity have showed a significant positive linear correlation with the elevated basal serum C-peptide levels and body mass indexes in both groups of patients. According to these data the cytokine might play a role in insulin resistance in obesity as well in Type 2 diabetes.
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Affiliation(s)
- G Winkler
- Department Int. Med., St. John's Hospital, Budapest, Hungary
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13
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Winkler G, Salamon F, Salamon D, Speer G, Simon K, Cseh K. Elevated serum tumour necrosis factor-alpha levels can contribute to the insulin resistance in Type II (non-insulin-dependent) diabetes and in obesity. Diabetologia 1998; 41:860-1. [PMID: 9686931 DOI: 10.1007/s001250051000] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Winkler G, Dworak O, Salamon F, Salamon D, Speer G, Cseh K. Increased interleukin-12 plasma concentrations in both, insulin-dependent and non-insulin-dependent diabetes mellitus. Diabetologia 1998; 41:488. [PMID: 9562356 DOI: 10.1007/s001250050935] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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15
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Winkler G, Salamon F, Porochnavec M, Solymosi D, Demeter J, Simon K, Salamon D, Karádi I, Cseh K, Romics L. Intimal-medical thickness of the carotid artery in NIDDM patients. Diabetes Care 1997; 20:1923-4. [PMID: 9405923 DOI: 10.2337/diacare.20.12.1923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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16
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Salamon D, Abbamonte P, Liu R, Klein MV, Lee WC, Ginsberg DM, Tartakovskii II, Veal BW. Large-shift Raman scattering features in superconducting YBa2Cu3O6+x. Phys Rev B Condens Matter 1996; 53:886-891. [PMID: 9983045 DOI: 10.1103/physrevb.53.886] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Salamon D, Liu R, Klein MV, Karlow MA, Cooper SL, Cheong SW, Lee WC, Ginsberg DM. Large-shift Raman scattering in insulating parent compounds of cuprate superconductors. Phys Rev B Condens Matter 1995; 51:6617-6633. [PMID: 9977196 DOI: 10.1103/physrevb.51.6617] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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18
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Liu R, Salamon D, Klein MV, Cooper SL, Lee WC, Cheong SW, Ginsberg DM. Novel Raman-active electronic excitations near the charge-transfer gap in insulating cuprates. Phys Rev Lett 1993; 71:3709-3712. [PMID: 10055052 DOI: 10.1103/physrevlett.71.3709] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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19
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Salamon D, Liu R, Klein MV, Groenke DA, Poeppelmeier KR, Dabrowski B, Han PD, Payne DA. Raman-scattering results from Y1-xCaxSr2Cu2GaO7. Phys Rev B Condens Matter 1993; 47:12242-12247. [PMID: 10005397 DOI: 10.1103/physrevb.47.12242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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