Epigenetic Changes of CXCR4 and Its Ligand CXCL12 as Prognostic Factors for Sporadic Breast Cancer

Chemokines and their receptors are involved in the development and cancer progression. The chemokine CXCL12 interacts with its receptor, CXCR4, to promote cellular adhesion, survival, proliferation and migration. The CXCR4 gene is upregulated in several types of cancers, including skin, lung, pancre...

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Published in:PloS one Vol. 6; no. 12; p. e29461
Main Authors: Ramos, Edneia A. S., Grochoski, Mariana, Braun-Prado, Karin, Seniski, Gerusa G., Cavalli, Iglenir J., Ribeiro, Enilze M. S. F., Camargo, Anamaria A., Costa, Fabrício F., Klassen, Giseli
Format: Journal Article
Language:English
Published: United States Public Library of Science 29.12.2011
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ISSN:1932-6203, 1932-6203
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Abstract Chemokines and their receptors are involved in the development and cancer progression. The chemokine CXCL12 interacts with its receptor, CXCR4, to promote cellular adhesion, survival, proliferation and migration. The CXCR4 gene is upregulated in several types of cancers, including skin, lung, pancreas, brain and breast tumors. In pancreatic cancer and melanoma, CXCR4 expression is regulated by DNA methylation within its promoter region. In this study we examined the role of cytosine methylation in the regulation of CXCR4 expression in breast cancer cell lines and also correlated the methylation pattern with the clinicopathological aspects of sixty-nine primary breast tumors from a cohort of Brazilian women. RT-PCR showed that the PMC-42, MCF7 and MDA-MB-436 breast tumor cell lines expressed high levels of CXCR4. Conversely, the MDA-MB-435 cell line only expressed CXCR4 after treatment with 5-Aza-CdR, which suggests that CXCR4 expression is regulated by DNA methylation. To confirm this hypothesis, a 184 bp fragment of the CXCR4 gene promoter region was cloned after sodium bisulfite DNA treatment. Sequencing data showed that cell lines that expressed CXCR4 had only 15% of methylated CpG dinucleotides, while the cell line that not have CXCR4 expression, had a high density of methylation (91%). Loss of DNA methylation in the CXCR4 promoter was detected in 67% of the breast cancer analyzed. The absence of CXCR4 methylation was associated with the tumor stage, size, histological grade, lymph node status, ESR1 methylation and CXCL12 methylation, metastasis and patient death. Kaplan-Meier curves demonstrated that patients with an unmethylated CXCR4 promoter had a poorer overall survival and disease-free survival. Furthermore, patients with both CXCL12 methylation and unmethylated CXCR4 had a shorter overall survival and disease-free survival. These findings suggest that the DNA methylation status of both CXCR4 and CXCL12 genes could be used as a biomarker for prognosis in breast cancer.
AbstractList Chemokines and their receptors are involved in the development and cancer progression. The chemokine CXCL12 interacts with its receptor, CXCR4, to promote cellular adhesion, survival, proliferation and migration. The CXCR4 gene is upregulated in several types of cancers, including skin, lung, pancreas, brain and breast tumors. In pancreatic cancer and melanoma, CXCR4 expression is regulated by DNA methylation within its promoter region. In this study we examined the role of cytosine methylation in the regulation of CXCR4 expression in breast cancer cell lines and also correlated the methylation pattern with the clinicopathological aspects of sixty-nine primary breast tumors from a cohort of Brazilian women. RT-PCR showed that the PMC-42, MCF7 and MDA-MB-436 breast tumor cell lines expressed high levels of CXCR4. Conversely, the MDA-MB-435 cell line only expressed CXCR4 after treatment with 5-Aza-CdR, which suggests that CXCR4 expression is regulated by DNA methylation. To confirm this hypothesis, a 184 bp fragment of the CXCR4 gene promoter region was cloned after sodium bisulfite DNA treatment. Sequencing data showed that cell lines that expressed CXCR4 had only 15% of methylated CpG dinucleotides, while the cell line that not have CXCR4 expression, had a high density of methylation (91%). Loss of DNA methylation in the CXCR4 promoter was detected in 67% of the breast cancer analyzed. The absence of CXCR4 methylation was associated with the tumor stage, size, histological grade, lymph node status, ESR1 methylation and CXCL12 methylation, metastasis and patient death. Kaplan-Meier curves demonstrated that patients with an unmethylated CXCR4 promoter had a poorer overall survival and disease-free survival. Furthermore, patients with both CXCL12 methylation and unmethylated CXCR4 had a shorter overall survival and disease-free survival. These findings suggest that the DNA methylation status of both CXCR4 and CXCL12 genes could be used as a biomarker for prognosis in breast cancer.
Chemokines and their receptors are involved in the development and cancer progression. The chemokine CXCL12 interacts with its receptor, CXCR4, to promote cellular adhesion, survival, proliferation and migration. The CXCR4 gene is upregulated in several types of cancers, including skin, lung, pancreas, brain and breast tumors. In pancreatic cancer and melanoma, CXCR4 expression is regulated by DNA methylation within its promoter region. In this study we examined the role of cytosine methylation in the regulation of CXCR4 expression in breast cancer cell lines and also correlated the methylation pattern with the clinicopathological aspects of sixty-nine primary breast tumors from a cohort of Brazilian women. RT-PCR showed that the PMC-42, MCF7 and MDA-MB-436 breast tumor cell lines expressed high levels of CXCR4. Conversely, the MDA-MB-435 cell line only expressed CXCR4 after treatment with 5-Aza-CdR, which suggests that CXCR4 expression is regulated by DNA methylation. To confirm this hypothesis, a 184 bp fragment of the CXCR4 gene promoter region was cloned after sodium bisulfite DNA treatment. Sequencing data showed that cell lines that expressed CXCR4 had only 15% of methylated CpG dinucleotides, while the cell line that not have CXCR4 expression, had a high density of methylation (91%). Loss of DNA methylation in the CXCR4 promoter was detected in 67% of the breast cancer analyzed. The absence of CXCR4 methylation was associated with the tumor stage, size, histological grade, lymph node status, ESR1 methylation and CXCL12 methylation, metastasis and patient death. Kaplan-Meier curves demonstrated that patients with an unmethylated CXCR4 promoter had a poorer overall survival and disease-free survival. Furthermore, patients with both CXCL12 methylation and unmethylated CXCR4 had a shorter overall survival and disease-free survival. These findings suggest that the DNA methylation status of both CXCR4 and CXCL12 genes could be used as a biomarker for prognosis in breast cancer.Chemokines and their receptors are involved in the development and cancer progression. The chemokine CXCL12 interacts with its receptor, CXCR4, to promote cellular adhesion, survival, proliferation and migration. The CXCR4 gene is upregulated in several types of cancers, including skin, lung, pancreas, brain and breast tumors. In pancreatic cancer and melanoma, CXCR4 expression is regulated by DNA methylation within its promoter region. In this study we examined the role of cytosine methylation in the regulation of CXCR4 expression in breast cancer cell lines and also correlated the methylation pattern with the clinicopathological aspects of sixty-nine primary breast tumors from a cohort of Brazilian women. RT-PCR showed that the PMC-42, MCF7 and MDA-MB-436 breast tumor cell lines expressed high levels of CXCR4. Conversely, the MDA-MB-435 cell line only expressed CXCR4 after treatment with 5-Aza-CdR, which suggests that CXCR4 expression is regulated by DNA methylation. To confirm this hypothesis, a 184 bp fragment of the CXCR4 gene promoter region was cloned after sodium bisulfite DNA treatment. Sequencing data showed that cell lines that expressed CXCR4 had only 15% of methylated CpG dinucleotides, while the cell line that not have CXCR4 expression, had a high density of methylation (91%). Loss of DNA methylation in the CXCR4 promoter was detected in 67% of the breast cancer analyzed. The absence of CXCR4 methylation was associated with the tumor stage, size, histological grade, lymph node status, ESR1 methylation and CXCL12 methylation, metastasis and patient death. Kaplan-Meier curves demonstrated that patients with an unmethylated CXCR4 promoter had a poorer overall survival and disease-free survival. Furthermore, patients with both CXCL12 methylation and unmethylated CXCR4 had a shorter overall survival and disease-free survival. These findings suggest that the DNA methylation status of both CXCR4 and CXCL12 genes could be used as a biomarker for prognosis in breast cancer.
Audience Academic
Author Camargo, Anamaria A.
Klassen, Giseli
Cavalli, Iglenir J.
Costa, Fabrício F.
Ribeiro, Enilze M. S. F.
Seniski, Gerusa G.
Ramos, Edneia A. S.
Grochoski, Mariana
Braun-Prado, Karin
AuthorAffiliation 1 Epigenetic and Molecular Biology Laboratory, Department of Basic Pathology, Federal University of Parana, Parana, Brazil
4 Laboratory of Molecular Biology and Genomics, Ludwig Institute for Cancer Research, São Paulo, São Paulo, Brazil
Health Canada, Canada
3 Department of Genetics, Federal University of Parana, Parana, Brazil
2 Cancer Biology and Epigenomics Program, Children's Memorial Research Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinios, United States of America
AuthorAffiliation_xml – name: 3 Department of Genetics, Federal University of Parana, Parana, Brazil
– name: 2 Cancer Biology and Epigenomics Program, Children's Memorial Research Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinios, United States of America
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  surname: Ramos
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  surname: Seniski
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  fullname: Klassen, Giseli
BackLink https://www.ncbi.nlm.nih.gov/pubmed/22220212$$D View this record in MEDLINE/PubMed
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Copyright COPYRIGHT 2011 Public Library of Science
2011 Ramos et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: https://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.
Ramos et al. 2011
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– notice: Ramos et al. 2011
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Carried out the experimental data acquisition, performed data analyses and interpretation and drafted the manuscript: EASR. Sequencing data collection: MG. Biostatistician in the study: KB. Processed cell cultures and DNA extractions: GGS. Provided patient material and clinicopathological data and critically revised the manuscript: EMSFR IJC. Critically revised the manuscript and suggested experiments: AAC. Experimental design, critically revised the manuscript and gave partial financial support: FFC. Designed and coordinated the study, supplied administrative support and critically revised the manuscript: GK. Performed the experiments: EASR MG GGS GK. Analyzed the data: EASR KB FFC GK. Contributed reagents/materials/analysis tools: IJC EMSFR AAC. Wrote the paper: EASR FFC GK. All authors read and approved the final manuscript.
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Snippet Chemokines and their receptors are involved in the development and cancer progression. The chemokine CXCL12 interacts with its receptor, CXCR4, to promote...
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SubjectTerms Adult
Aged
Aged, 80 and over
Biology
Biomarkers
Biotechnology
Bisulfite
Brain
Brain tumors
Brazil
Breast cancer
Breast Neoplasms - diagnosis
Breast Neoplasms - genetics
Breast Neoplasms - pathology
Cancer
Cancer metastasis
Cancer therapies
Cancer treatment
Cell Line, Tumor
Cell survival
Chemokine CXCL12 - genetics
Chemokines
Cloning
CpG islands
CXCL12 protein
CXCR4 protein
Cytosine
Decision making
Deoxyribonucleic acid
Development and progression
DNA
DNA methylation
DNA Methylation - genetics
DNA sequencing
Epigenesis, Genetic
Epigenetic inheritance
Epigenetics
ESR1 protein
Female
Gene expression
Gene Expression Regulation, Neoplastic
Gene sequencing
Gene Silencing
Genes
Genomics
Humans
Kaplan-Meier Estimate
Laboratories
Leukocyte migration
Ligands
Lungs
Lymph nodes
Lymphatic system
Medical prognosis
Medical research
Medicine
Melanoma
Metastases
Metastasis
Methylation
Middle Aged
Molecular biology
Mortality
Pancreas
Pancreatic cancer
Pathology
Patients
Polymerase chain reaction
Prognosis
Promoter Regions, Genetic - genetics
Public health
Receptors
Receptors, CXCR4 - genetics
Receptors, CXCR4 - metabolism
Reverse Transcriptase Polymerase Chain Reaction
Sequence Analysis, DNA
Skin
Sodium
Sulfites
Survival
Tumor cell lines
Tumors
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Title Epigenetic Changes of CXCR4 and Its Ligand CXCL12 as Prognostic Factors for Sporadic Breast Cancer
URI https://www.ncbi.nlm.nih.gov/pubmed/22220212
https://www.proquest.com/docview/1311198815
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https://doaj.org/article/327244c9b45c4f16b796ac1f1a0d0448
http://dx.doi.org/10.1371/journal.pone.0029461
Volume 6
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