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  1. Article ; Online: The most important problems and needs of rasopathy patients with a noonan syndrome spectrum disorder.

    Tiemens, Dagmar K / Kleimeier, Lotte / Leenders, Erika / Wingbermühle, Ellen / Roelofs, Renee L / Sibbles, Barbara / Oostwegel, Floor S M / Vroonland, Eva / van Leeuwen, Conny / Niessen, Hanneke / Sonnega, Paul / Duursma, Anniek / Willemsen, Michel A A P / Draaisma, Jos M T / Pittens, Carina A C M

    Orphanet journal of rare diseases

    2023  Volume 18, Issue 1, Page(s) 198

    Abstract: ... at the group level, but to also focus on specific needs according to e.g. age, phenotype and gender ... of e.g. coagulation, neuropsychological and musculoskeletal problems (like physiotherapy or ...

    Abstract Background: Noonan syndrome spectrum disorders (NSSDs) constitute a group within the Rasopathies, and are one of the largest groups of syndromes with impact on multi-organ involvement known. The extreme variability of the clinical phenotype is, among others, due to the numerous different genes that are involved, and the differences in clinical presentation over the life span. We have studied the needs of patients and their relatives aiming to develop, evaluate and choose focus in research, medical care and policy to better meet their perspectives.
    Methods: Using the participatory and interactive Dialogue method, 80 patients and relatives mentioned 53 different problems or needs (topics) that were categorized into eight themes. These themes and the topics within each theme, were subsequently prioritized by putting them in order of importance methodologically.
    Results: The four highest prioritized themes were: (1) Physical problems (non-musculoskeletal related); (2) Social, emotional and behavioral problems; (3) Cognitive functioning and information processing; and (4) Problems related to the musculoskeletal system. Nineteen out of the 53 topics were physical problems. According to the total group of respondents, the top 3 prioritized topics within theme 1 were coagulation problems, heart problems, and feeding problems. Also data stratified by age groups, phenotype (NS and other NSSDs) and gender showed some remarkable results. For instance, feeding problems were prioritized as the most important topic of the highest prioritized theme, according to patients aged 0-12 years. Also feeding problems show a significant difference in its prioritization according to female patients (2) compared to male patients (7). On the other hand, heart problems were not mentioned in the top three prioritized topics in the youngest age groups, although heart problems are generally considered most important for patients with NSSD.
    Conclusions: With our results we underline the importance of methodologically inventorying the needs of NSSD patients, not only at the group level, but to also focus on specific needs according to e.g. age, phenotype and gender. For instance, it is remarkable that both the current Clinical Guidelines and the Noonan Syndrome diagnostic criteria give little to no attention to feeding problems, though our results indicate that, to the youngest patients, these problems have top priority. A similar situation appears to apply to the clinical management of e.g. coagulation, neuropsychological and musculoskeletal problems (like physiotherapy or occupational therapy) and to a need for (educational) tools to support patients at school or at work. Our study may help to shape targeted (clinical) management, research and policy inside and outside medical (research) institutes and shed light on the complex phenotypes of NSSDs, the families' and patients' perspectives on the everyday consequences of the many different problems, as well as their needs.
    MeSH term(s) Humans ; Male ; Female ; Noonan Syndrome/genetics ; Noonan Syndrome/diagnosis ; Cognition ; Phenotype
    Language English
    Publishing date 2023-07-21
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2225857-7
    ISSN 1750-1172 ; 1750-1172
    ISSN (online) 1750-1172
    ISSN 1750-1172
    DOI 10.1186/s13023-023-02818-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The emerging role of GATA transcription factors in development and disease.

    Lentjes, Marjolein H F M / Niessen, Hanneke E C / Akiyama, Yoshimitsu / de Bruïne, Adriaan P / Melotte, Veerle / van Engeland, Manon

    Expert reviews in molecular medicine

    2016  Volume 18, Page(s) e3

    Abstract: The GATA family of transcription factors consists of six proteins (GATA1-6) which are involved in a variety of physiological and pathological processes. GATA1/2/3 are required for differentiation of mesoderm and ectoderm-derived tissues, including the ... ...

    Abstract The GATA family of transcription factors consists of six proteins (GATA1-6) which are involved in a variety of physiological and pathological processes. GATA1/2/3 are required for differentiation of mesoderm and ectoderm-derived tissues, including the haematopoietic and central nervous system. GATA4/5/6 are implicated in development and differentiation of endoderm- and mesoderm-derived tissues such as induction of differentiation of embryonic stem cells, cardiovascular embryogenesis and guidance of epithelial cell differentiation in the adult.
    MeSH term(s) Animals ; Cardiovascular System/growth & development ; Cardiovascular System/metabolism ; Cell Differentiation ; Central Nervous System/growth & development ; Central Nervous System/metabolism ; Embryonic Stem Cells/cytology ; Embryonic Stem Cells/metabolism ; Endoderm/cytology ; Endoderm/growth & development ; Endoderm/metabolism ; Epithelial Cells/cytology ; Epithelial Cells/metabolism ; GATA Transcription Factors/genetics ; GATA Transcription Factors/metabolism ; Gene Expression Regulation, Developmental ; Hematopoietic System/growth & development ; Hematopoietic System/metabolism ; Humans ; Mesoderm/cytology ; Mesoderm/growth & development ; Mesoderm/metabolism ; Mutation ; Neoplasms/genetics ; Neoplasms/metabolism ; Neoplasms/pathology ; Porphyria, Erythropoietic/genetics ; Porphyria, Erythropoietic/metabolism ; Porphyria, Erythropoietic/pathology ; Signal Transduction
    Chemical Substances GATA Transcription Factors
    Language English
    Publishing date 2016-03-08
    Publishing country England
    Document type Journal Article ; Review
    ISSN 1462-3994
    ISSN (online) 1462-3994
    DOI 10.1017/erm.2016.2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Talking to chromatin: post-translational modulation of polycomb group function.

    Niessen, Hanneke E C / Demmers, Jeroen A / Voncken, Jan Willem

    Epigenetics & chromatin

    2009  Volume 2, Issue 1, Page(s) 10

    Abstract: Polycomb Group proteins are important epigenetic regulators of gene expression. Epigenetic control by polycomb Group proteins involves intrinsic as well as associated enzymatic activities. Polycomb target genes change with cellular context, lineage ... ...

    Abstract Polycomb Group proteins are important epigenetic regulators of gene expression. Epigenetic control by polycomb Group proteins involves intrinsic as well as associated enzymatic activities. Polycomb target genes change with cellular context, lineage commitment and differentiation status, revealing dynamic regulation of polycomb function. It is currently unclear how this dynamic modulation is controlled and how signaling affects polycomb-mediated epigenetic processes at the molecular level. Experimental evidence on regulation of polycomb function by post-translational mechanisms is steadily emerging: Polycomb Group proteins are targeted for ubiquitylation, sumoylation and phosphorylation. In addition, specific Polycomb Group proteins modify other (chromatin) associated proteins via similar post-translational modifications. Such modifications affect protein function by affecting protein stability, protein-protein interactions and enzymatic activities. Here, we review current insights in covalent modification of Polycomb Group proteins in the context of protein function and present a tentative view of integrated signaling to chromatin in the context of phosphorylation. Clearly, the available literature reveals just the tip of the iceberg, and exact molecular mechanisms in, and the biological relevance of post-translational regulation of polycomb function await further elucidation. Our understanding of causes and consequences of post-translational modification of polycomb proteins will gain significantly from in vivo validation experiments. Impaired polycomb function has important repercussions for stem cell function, development and disease. Ultimately, increased understanding of signaling to chromatin and the mechanisms involved in epigenetic remodeling will contribute to the development of therapeutic interventions in cell fate decisions in development and disease.
    Language English
    Publishing date 2009-09-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 2462129-8
    ISSN 1756-8935 ; 1756-8935
    ISSN (online) 1756-8935
    ISSN 1756-8935
    DOI 10.1186/1756-8935-2-10
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Epigenetics in radiotherapy: where are we heading?

    Smits, Kim M / Melotte, Veerle / Niessen, Hanneke E C / Dubois, Ludwig / Oberije, Cary / Troost, Esther G C / Starmans, Maud H W / Boutros, Paul C / Vooijs, Marc / van Engeland, Manon / Lambin, Philippe

    Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology

    2014  Volume 111, Issue 2, Page(s) 168–177

    Abstract: Radiotherapy is an important component of anti-cancer treatment. However, not all cancer patients respond to radiotherapy, and with current knowledge clinicians are unable to predict which patients are at high risk of recurrence after radiotherapy. There ...

    Abstract Radiotherapy is an important component of anti-cancer treatment. However, not all cancer patients respond to radiotherapy, and with current knowledge clinicians are unable to predict which patients are at high risk of recurrence after radiotherapy. There is therefore an urgent need for biomarkers to guide clinical decision-making. Although the importance of epigenetic alterations is widely accepted, their application as biomarkers in radiotherapy has not been studied extensively. In addition, it has been suggested that radiotherapy itself introduces epigenetic alterations. As epigenetic alterations can potentially be reversed by drug treatment, they are interesting candidate targets for anticancer therapy or radiotherapy sensitizers. The application of demethylating drugs or histone deacetylase inhibitors to sensitize patients for radiotherapy has been studied in vitro, in vivo as well as in clinical trials with promising results. This review describes the current knowledge on epigenetics in radiotherapy.
    MeSH term(s) Antineoplastic Agents/therapeutic use ; Biomarkers, Tumor/genetics ; DNA Methylation/drug effects ; DNA Modification Methylases/therapeutic use ; Epigenesis, Genetic/drug effects ; Epigenesis, Genetic/radiation effects ; Histone Deacetylase Inhibitors/therapeutic use ; Humans ; Neoplasms/drug therapy ; Neoplasms/genetics ; Neoplasms/radiotherapy ; Radiation-Sensitizing Agents/therapeutic use
    Chemical Substances Antineoplastic Agents ; Biomarkers, Tumor ; Histone Deacetylase Inhibitors ; Radiation-Sensitizing Agents ; DNA Modification Methylases (EC 2.1.1.-)
    Language English
    Publishing date 2014-05
    Publishing country Ireland
    Document type Journal Article ; Review
    ZDB-ID 605646-5
    ISSN 1879-0887 ; 0167-8140
    ISSN (online) 1879-0887
    ISSN 0167-8140
    DOI 10.1016/j.radonc.2014.05.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: MK3 modulation affects BMI1-dependent and independent cell cycle check-points.

    Prickaerts, Peggy / Niessen, Hanneke E C / Dahlmans, Vivian E H / Spaapen, Frank / Salvaing, Juliette / Vanhove, Jolien / Geijselaers, Claudia / Bartels, Stefanie J J / Partouns, Iris / Neumann, Dietbert / Speel, Ernst-Jan / Takihara, Yoshihiro / Wouters, Bradly G / Voncken, Jan Willem

    PloS one

    2015  Volume 10, Issue 4, Page(s) e0118840

    Abstract: Although the MK3 gene was originally found deleted in some cancers, it is highly expressed in others. The relevance of MK3 for oncogenesis is currently not clear. We recently reported that MK3 controls ERK activity via a negative feedback mechanism. This ...

    Abstract Although the MK3 gene was originally found deleted in some cancers, it is highly expressed in others. The relevance of MK3 for oncogenesis is currently not clear. We recently reported that MK3 controls ERK activity via a negative feedback mechanism. This prompted us to investigate a potential role for MK3 in cell proliferation. We here show that overexpression of MK3 induces a proliferative arrest in normal diploid human fibroblasts, characterized by enhanced expression of replication stress- and senescence-associated markers. Surprisingly, MK3 depletion evokes similar senescence characteristics in the fibroblast model. We previously identified MK3 as a binding partner of Polycomb Repressive Complex 1 (PRC1) proteins. In the current study we show that MK3 overexpression results in reduced cellular EZH2 levels and concomitant loss of epigenetic H3K27me3-marking and PRC1/chromatin-occupation at the CDKN2A/INK4A locus. In agreement with this, the PRC1 oncoprotein BMI1, but not the PCR2 protein EZH2, bypasses MK3-induced senescence in fibroblasts and suppresses P16INK4A expression. In contrast, BMI1 does not rescue the MK3 loss-of-function phenotype, suggesting the involvement of multiple different checkpoints in gain and loss of MK3 function. Notably, MK3 ablation enhances proliferation in two different cancer cells. Finally, the fibroblast model was used to evaluate the effect of potential tumorigenic MK3 driver-mutations on cell proliferation and M/SAPK signaling imbalance. Taken together, our findings support a role for MK3 in control of proliferation and replicative life-span, in part through concerted action with BMI1, and suggest that the effect of MK3 modulation or mutation on M/SAPK signaling and, ultimately, proliferation, is cell context-dependent.
    MeSH term(s) Cell Cycle Checkpoints ; Cell Line, Tumor ; Cell Proliferation ; Cellular Senescence ; Fibroblasts/cytology ; Fibroblasts/metabolism ; Humans ; Intracellular Signaling Peptides and Proteins/genetics ; Intracellular Signaling Peptides and Proteins/metabolism ; MAP Kinase Signaling System ; Mitogen-Activated Protein Kinase 7/metabolism ; Mutation ; Polycomb-Group Proteins/metabolism ; Protein-Serine-Threonine Kinases/genetics ; Protein-Serine-Threonine Kinases/metabolism
    Chemical Substances Intracellular Signaling Peptides and Proteins ; Polycomb-Group Proteins ; MAP-kinase-activated kinase 3 (EC 2.7.1.-) ; Protein-Serine-Threonine Kinases (EC 2.7.11.1) ; MAPK7 protein, human (EC 2.7.11.24) ; Mitogen-Activated Protein Kinase 7 (EC 2.7.11.24)
    Language English
    Publishing date 2015
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0118840
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Spectrin repeat containing nuclear envelope 1 and forkhead box protein E1 are promising markers for the detection of colorectal cancer in blood.

    Melotte, Veerle / Yi, Joo Mi / Lentjes, Marjolein H F M / Smits, Kim M / Van Neste, Leander / Niessen, Hanneke E C / Wouters, Kim A D / Louwagie, Joost / Schuebel, Kornel E / Herman, James G / Baylin, Stephen B / van Criekinge, Wim / Meijer, Gerrit A / Ahuja, Nita / van Engeland, Manon

    Cancer prevention research (Philadelphia, Pa.)

    2015  Volume 8, Issue 2, Page(s) 157–164

    Abstract: Identifying biomarkers in body fluids may improve the noninvasive detection of colorectal cancer. Previously, we identified N-Myc downstream-regulated gene 4 (NDRG4) and GATA binding protein 5 (GATA5) methylation as promising biomarkers for colorectal ... ...

    Abstract Identifying biomarkers in body fluids may improve the noninvasive detection of colorectal cancer. Previously, we identified N-Myc downstream-regulated gene 4 (NDRG4) and GATA binding protein 5 (GATA5) methylation as promising biomarkers for colorectal cancer in stool DNA. Here, we examined the utility of NDRG4, GATA5, and two additional markers [Forkhead box protein E1 (FOXE1) and spectrin repeat containing nuclear envelope 1 (SYNE1)] promoter methylation as biomarkers in plasma DNA. Quantitative methylation-specific PCR was performed on plasma DNA from 220 patients with colorectal cancer and 684 noncancer controls, divided in a training set and a test set. Receiver operating characteristic analysis was performed to measure the area under the curve of GATA5, NDRG4, SYNE1, and FOXE1 methylation. Functional assays were performed in SYNE1 and FOXE1 stably transfected cell lines. The sensitivity of NDRG4, GATA5, FOXE1, and SYNE1 methylation in all stages of colorectal cancer (154 cases, 444 controls) was 27% [95% confidence interval (CI), 20%-34%), 18% (95% CI, 12%-24%), 46% (95% CI, 38%-54%), and 47% (95% CI, 39%-55%), with a specificity of 95% (95% CI, 93%-97%), 99% (95% CI, 98%-100%), 93% (95% CI, 91%-95%), and 96% (95% CI, 94%-98%), respectively. Combining SYNE1 and FOXE1, increased the sensitivity to 56% (95% CI, 48%-64%), while the specificity decreased to 90% (95% CI, 87%-93%) in the training set and to 58% sensitivity (95% CI, 46%-70%) and 91% specificity (95% CI, 80%-100%) in a test set (66 cases, 240 controls). SYNE1 overexpression showed no major differences in cell proliferation, migration, and invasion compared with controls. Overexpression of FOXE1 significantly decreased the number of colonies in SW480 and HCT116 cell lines. Overall, our data suggest that SYNE1 and FOXE1 are promising markers for colorectal cancer detection.
    MeSH term(s) Aged ; Area Under Curve ; Biomarkers, Tumor/blood ; Biomarkers, Tumor/genetics ; Cell Line, Tumor ; Colorectal Neoplasms/blood ; Colorectal Neoplasms/genetics ; DNA Methylation/genetics ; Female ; Forkhead Transcription Factors/blood ; Forkhead Transcription Factors/genetics ; Humans ; Male ; Middle Aged ; Nerve Tissue Proteins/blood ; Nerve Tissue Proteins/genetics ; Nuclear Proteins/blood ; Nuclear Proteins/genetics ; Promoter Regions, Genetic/genetics ; ROC Curve ; Real-Time Polymerase Chain Reaction ; Sensitivity and Specificity ; Transfection
    Chemical Substances Biomarkers, Tumor ; FOXE1 protein, human ; Forkhead Transcription Factors ; Nerve Tissue Proteins ; Nuclear Proteins ; SYNE1 protein, human
    Language English
    Publishing date 2015-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2434717-6
    ISSN 1940-6215 ; 1940-6207
    ISSN (online) 1940-6215
    ISSN 1940-6207
    DOI 10.1158/1940-6207.CAPR-14-0198
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: MK3 modulation affects BMI1-dependent and independent cell cycle check-points.

    Peggy Prickaerts / Hanneke E C Niessen / Vivian E H Dahlmans / Frank Spaapen / Juliette Salvaing / Jolien Vanhove / Claudia Geijselaers / Stefanie J J Bartels / Iris Partouns / Dietbert Neumann / Ernst-Jan Speel / Yoshihiro Takihara / Bradly G Wouters / Jan Willem Voncken

    PLoS ONE, Vol 10, Iss 4, p e

    2015  Volume 0118840

    Abstract: Although the MK3 gene was originally found deleted in some cancers, it is highly expressed in others. The relevance of MK3 for oncogenesis is currently not clear. We recently reported that MK3 controls ERK activity via a negative feedback mechanism. This ...

    Abstract Although the MK3 gene was originally found deleted in some cancers, it is highly expressed in others. The relevance of MK3 for oncogenesis is currently not clear. We recently reported that MK3 controls ERK activity via a negative feedback mechanism. This prompted us to investigate a potential role for MK3 in cell proliferation. We here show that overexpression of MK3 induces a proliferative arrest in normal diploid human fibroblasts, characterized by enhanced expression of replication stress- and senescence-associated markers. Surprisingly, MK3 depletion evokes similar senescence characteristics in the fibroblast model. We previously identified MK3 as a binding partner of Polycomb Repressive Complex 1 (PRC1) proteins. In the current study we show that MK3 overexpression results in reduced cellular EZH2 levels and concomitant loss of epigenetic H3K27me3-marking and PRC1/chromatin-occupation at the CDKN2A/INK4A locus. In agreement with this, the PRC1 oncoprotein BMI1, but not the PCR2 protein EZH2, bypasses MK3-induced senescence in fibroblasts and suppresses P16INK4A expression. In contrast, BMI1 does not rescue the MK3 loss-of-function phenotype, suggesting the involvement of multiple different checkpoints in gain and loss of MK3 function. Notably, MK3 ablation enhances proliferation in two different cancer cells. Finally, the fibroblast model was used to evaluate the effect of potential tumorigenic MK3 driver-mutations on cell proliferation and M/SAPK signaling imbalance. Taken together, our findings support a role for MK3 in control of proliferation and replicative life-span, in part through concerted action with BMI1, and suggest that the effect of MK3 modulation or mutation on M/SAPK signaling and, ultimately, proliferation, is cell context-dependent.
    Keywords Medicine ; R ; Science ; Q
    Subject code 570
    Language English
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Genetics and epigenetics of cutaneous malignant melanoma: a concert out of tune.

    van den Hurk, Karin / Niessen, Hanneke E C / Veeck, Jürgen / van den Oord, Joost J / van Steensel, Maurice A M / Zur Hausen, Axel / van Engeland, Manon / Winnepenninckx, Véronique J L

    Biochimica et biophysica acta

    2012  Volume 1826, Issue 1, Page(s) 89–102

    Abstract: Cutaneous malignant melanoma (CMM) is the most life-threatening neoplasm of the skin and is considered a major health problem as both incidence and mortality rates continue to rise. Once CMM has metastasized it becomes therapy-resistant and is an ... ...

    Abstract Cutaneous malignant melanoma (CMM) is the most life-threatening neoplasm of the skin and is considered a major health problem as both incidence and mortality rates continue to rise. Once CMM has metastasized it becomes therapy-resistant and is an inevitably deadly disease. Understanding the molecular mechanisms that are involved in the initiation and progression of CMM is crucial for overcoming the commonly observed drug resistance as well as developing novel targeted treatment strategies. This molecular knowledge may further lead to the identification of clinically relevant biomarkers for early CMM detection, risk stratification, or prediction of response to therapy, altogether improving the clinical management of this disease. In this review we summarize the currently identified genetic and epigenetic alterations in CMM development. Although the genetic components underlying CMM are clearly emerging, a complete picture of the epigenetic alterations on DNA (DNA methylation), RNA (non-coding RNAs), and protein level (histone modifications, Polycomb group proteins, and chromatin remodeling) and the combinatorial interactions between these events is lacking. More detailed knowledge, however, is accumulating for genetic and epigenetic interactions in the aberrant regulation of the INK4b-ARF-INK4a and microphthalmia-associated transcription factor (MITF) loci. Importantly, we point out that it is this interplay of genetics and epigenetics that effectively leads to distorted gene expression patterns in CMM.
    MeSH term(s) Chromatin Assembly and Disassembly ; DNA Methylation ; Epigenesis, Genetic ; Gene Expression ; Humans ; Melanoma/genetics ; MicroRNAs/genetics ; Skin Neoplasms/genetics
    Chemical Substances MicroRNAs
    Language English
    Publishing date 2012-08
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 60-7
    ISSN 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650 ; 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    ISSN (online) 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650
    ISSN 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    DOI 10.1016/j.bbcan.2012.03.011
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Analysis of promoter CpG island hypermethylation in cancer: location, location, location!

    van Vlodrop, Iris J H / Niessen, Hanneke E C / Derks, Sarah / Baldewijns, Marcella M L L / van Criekinge, Wim / Herman, James G / van Engeland, Manon

    Clinical cancer research : an official journal of the American Association for Cancer Research

    2011  Volume 17, Issue 13, Page(s) 4225–4231

    Abstract: The genetic and epigenetic alterations that underlie cancer pathogenesis are rapidly being identified. This provides novel insights in tumor biology as well as in potential cancer biomarkers. The somatic mutations in cancer genes that have been ... ...

    Abstract The genetic and epigenetic alterations that underlie cancer pathogenesis are rapidly being identified. This provides novel insights in tumor biology as well as in potential cancer biomarkers. The somatic mutations in cancer genes that have been implemented in clinical practice are well defined and very specific. For epigenetic alterations, and more specifically aberrant methylation of promoter CpG islands, evidence is emerging that these markers could be used for the early detection of cancer as well as prediction of prognosis and response to therapy. However, the exact location of biologically and clinically relevant hypermethylation has not been identified for the majority of methylation markers. The most widely used approaches to analyze DNA methylation are based on primer- and probe-based assays that provide information for a limited number of CpG dinucleotides and thus for only part of the information available in a given CpG island. Validation of the current data and implementation of hypermethylation markers in clinical practice require a more comprehensive and critical evaluation of DNA methylation and limitations of the techniques currently used in methylation marker research. Here, we discuss the emerging evidence on the importance of the location of CpG dinucleotide hypermethylation in relation to gene expression and associations with clinicopathologic characteristics in cancer.
    MeSH term(s) CpG Islands/genetics ; DNA Methylation/genetics ; Epigenesis, Genetic ; Gene Expression Regulation, Neoplastic ; Humans ; Neoplasms/genetics ; Promoter Regions, Genetic
    Language English
    Publishing date 2011-07-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1225457-5
    ISSN 1557-3265 ; 1078-0432
    ISSN (online) 1557-3265
    ISSN 1078-0432
    DOI 10.1158/1078-0432.CCR-10-3394
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Etomoxir-induced partial carnitine palmitoyltransferase-I (CPT-I) inhibition in vivo does not alter cardiac long-chain fatty acid uptake and oxidation rates.

    Luiken, Joost J F P / Niessen, Hanneke E C / Coort, Susan L M / Hoebers, Nicole / Coumans, Will A / Schwenk, Robert W / Bonen, Arend / Glatz, Jan F C

    The Biochemical journal

    2009  Volume 419, Issue 2, Page(s) 447–455

    Abstract: Although CPT-I (carnitine palmitoyltransferase-I) is generally regarded to present a major rate-controlling site in mitochondrial beta-oxidation, it is incompletely understood whether CPT-I is rate-limiting in the overall LCFA (long-chain fatty acid) ... ...

    Abstract Although CPT-I (carnitine palmitoyltransferase-I) is generally regarded to present a major rate-controlling site in mitochondrial beta-oxidation, it is incompletely understood whether CPT-I is rate-limiting in the overall LCFA (long-chain fatty acid) flux in the heart. Another important site of regulation of the LCFA flux in the heart is trans-sarcolemmal LCFA transport facilitated by CD36 and FABPpm (plasma membrane fatty acid-binding protein). Therefore, we explored to what extent a chronic pharmacological blockade of the LCFA flux at the level of mitochondrial entry of LCFA-CoA would affect sarcolemmal LCFA uptake. Rats were injected daily with saline or etomoxir, a specific CPT-I inhibitor, for 8 days at 20 mg/kg of body mass. Etomoxir-treated rats displayed a 44% reduced cardiac CPT-I activity. Sarcolemmal contents of CD36 and FABPpm, as well as the LCFA transport capacity, were not altered in the hearts of etomoxir-treated versus control rats. Furthermore, rates of LCFA uptake and oxidation, and glucose uptake by cardiac myocytes from etomoxir-treated rats were not different from control rats, neither under basal nor under acutely induced maximal metabolic demands. Finally, hearts from etomoxir-treated rats did not display triacylglycerol accumulation. Therefore CPT-I appears not to present a major rate-controlling site in total cardiac LCFA flux. It is likely that sarcolemmal LCFA entry rather than mitochondrial LCFA-CoA entry is a promising target for normalizing LCFA flux in cardiac metabolic diseases.
    MeSH term(s) Animals ; Biological Transport/drug effects ; Blotting, Western ; Carnitine O-Palmitoyltransferase/metabolism ; Cells, Cultured ; Electrophoresis, Polyacrylamide Gel ; Enzyme Activation/drug effects ; Epoxy Compounds/pharmacology ; Fatty Acids/metabolism ; Male ; Myocytes, Cardiac/drug effects ; Myocytes, Cardiac/metabolism ; Oxidation-Reduction/drug effects ; Rats ; Triglycerides/metabolism
    Chemical Substances Epoxy Compounds ; Fatty Acids ; Triglycerides ; Carnitine O-Palmitoyltransferase (EC 2.3.1.21) ; etomoxir (MSB3DD2XP6)
    Language English
    Publishing date 2009-04-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2969-5
    ISSN 1470-8728 ; 0006-2936 ; 0306-3275 ; 0264-6021
    ISSN (online) 1470-8728
    ISSN 0006-2936 ; 0306-3275 ; 0264-6021
    DOI 10.1042/BJ20082159
    Database MEDical Literature Analysis and Retrieval System OnLINE

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