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El Azzouzi M, El Ahanidi H, Hafidi Alaoui C, Chaoui I, Benbacer L, Tetou M, Hassan I, Bensaid M, Oukabli M, Ameur A, Al Bouzidi A, El Mzibri M, Attaleb M. Evaluation of DNA methylation in promoter regions of hTERT, TWIST1, VIM and NID2 genes in Moroccan bladder cancer patients. Cancer Genet 2021; 260-261:41-45. [PMID: 34922269 DOI: 10.1016/j.cancergen.2021.12.001] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 11/08/2021] [Accepted: 12/05/2021] [Indexed: 12/11/2022]
Abstract
Promoter hypermethylation have been reported to play a key role in bladder cancer development and progression. The aim of this study is to evaluate the methylation status of hTERT, TWIST1, VIM and NID2 genes in bladder cancer. The methylation status was evaluated using the Methylation-Specific PCR (MSP) approach on 70 tumour biopsies from Moroccan bladder cancer patients. Overall, methylation frequencies of hTERT, TWIST1, VIM and NID2 genes, were 90%, 85.71%, 67.14% and 67.14%, respectively. Hypermethylation of all studied genes was found in all pathological grades and stages of bladder cancer. Nevertheless, statistical analysis showed no significant association between promoter methylation of hTERT, TWIST1, VIM and NID2 genes and tumours stage/grade (p value >0.05). Moreover, we have investigated the association between the methylation pattern of selected genes and the treatment outcome in a sub-group of non-muscle-invasive bladder cancer cases (52/70). Hypermethylation of hTERT, TWIST1, VIM and NID2 was detected in 83.34%; 66.67%; 83.34% and 58.34% of recurrent cases, respectively, and in 80%; 80%; 80% and 60% of progressive cases, respectively. Statistical analysis highlighted a significant association between TWIST1 hypermethylation and tumour recurrence (p = 0.041<0.05). Our results indicate that hypermethylation of hTERT, TWIST1, VIM and NID2 genes is a frequent epigenetic event in bladder cancer and could be a promising therapeutic target to prevent bladder cancer progression and metastasis.
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Affiliation(s)
- Meryem El Azzouzi
- Biology and Medical Research Unit, CNESTEN, Rabat, Morocco; Faculty of Medicine and Pharmacy of Rabat. Mohammed V University in Rabat, Rabat, Morocco
| | - Hajar El Ahanidi
- Biology and Medical Research Unit, CNESTEN, Rabat, Morocco; Faculty of Medicine and Pharmacy of Rabat. Mohammed V University in Rabat, Rabat, Morocco
| | - Chaimae Hafidi Alaoui
- Biology and Medical Research Unit, CNESTEN, Rabat, Morocco; Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco
| | - Imane Chaoui
- Biology and Medical Research Unit, CNESTEN, Rabat, Morocco
| | - Laila Benbacer
- Biology and Medical Research Unit, CNESTEN, Rabat, Morocco
| | | | | | | | - Mohamed Oukabli
- Faculty of Medicine and Pharmacy of Rabat. Mohammed V University in Rabat, Rabat, Morocco; Mohammed V Military Hospital, Rabat, Morocco
| | - Ahmed Ameur
- Faculty of Medicine and Pharmacy of Rabat. Mohammed V University in Rabat, Rabat, Morocco; Mohammed V Military Hospital, Rabat, Morocco
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Zuberi M, Dholariya S, Khan I, Mir R, Guru S, Bhat M, Sumi M, Saxena A. Epigenetic Silencing of DAPK1and p16 INK4a Genes by CpG Island Hypermethylation in Epithelial Ovarian Cancer Patients. Indian J Clin Biochem 2021; 36:200-7. [PMID: 33867711 DOI: 10.1007/s12291-020-00888-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 05/01/2020] [Indexed: 02/06/2023]
Abstract
Transcriptional silencing induced by hypermethylation of CpG islands in the promoter regions of genes is believed to be an important mechanism of carcinogenesis in human cancers including epithelial ovarian cancer (EOC). Previously published data on gene methylation of EOC focused mainly on single gene or on cancer tissues. Objectives of the study were to estimate the promoter hypermethylation status of DAPK1 and p16 INK4a genes in circulating blood of EOC patients and to determine their association with clinicopathological features of EOC. This case-control study included 50 EOC patients and 20 apparently healthy and age matched female controls. Isolation of genomic DNA was carried out from peripheral venous blood. Methylation in promoter region of DAPK1 and p16 INK4a genes was determined by methylation-specific PCR. Methylation of DAPK1 was occurred in 42 out of 50 cases (84.0%) and methylation of p16 INK4a gene was occurred in 34 out of 50 cases (68.0%). Methylation of both genes was occurred in 25 cases (50.0%). Occurrence of methylation in DAPK1 and p16 INK4a genes was statistically significant (p < 0.0001) in cases compared to controls. Methylation of both genes was not statistically associated with age at diagnosis, menopausal status, histopathological types and FIGO staging of EOC. Identification of the peculiar promoter hypermethylation of DAPK1 and p16 INK4a genes might be a successful approach for ancillary diagnosis of EOC at early stage in blood sample.
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Kumar A, Singh P, Pandey A, Gosipatala SB. IGFBP3 gene promoter methylation analysis and its association with clinicopathological characteristics of colorectal carcinoma. Mol Biol Rep 2020; 47:6919-6927. [PMID: 32929656 DOI: 10.1007/s11033-020-05747-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 12/30/2019] [Accepted: 08/28/2020] [Indexed: 12/24/2022]
Abstract
Promoter methylation mediated silencing of tumor suppressor genes plays an important role in the tumorigenesis of colorectal carcinoma (CRC). Tumor suppressor gene, Insulin-like Growth Factor Binding Protein-3 (IGFBP-3) expression is frequently downregulated in CRC due to promoter methylations. The aim of this study was to analyze the methylation status of IGFBP-3 gene promoter in stage II and III of CRC cases; find its association with clinicopathological characteristics of CRC patients and the methylation patterns as a prognostic biomarker. 58 histopathologically confirmed cases of CRC were included in the study. Methylation status of IGFBP-3 gene promoter was determined by using methylation specific PCR (MS-PCR) and bisulfite sequencing. Kaplan-Meier survival curve and univariate cox regression analysis were used for survival analysis; Chi-square test used for association analysis. IGFBP3 promoter methylation was found in 37 (63.8%) out of 58 CRC cases. This promoter methylation status was significantly associated with lymph-node metastasis (P = 0.013) and the survival period. In stage II CRC cases, unmethylated gene promoter status showed better survival than the methylated. Mean overall survival (OS) of methylated and unmethylated group was 22.23 months, and 49.15 months respectively (P = 0.045), HR = 6.432, 95% CI 0.986-41.943. The IGFBP-3 promoter methylations found in 63.8% CRC cases in this study. The methylations was found to be associated with lymph-node metastasis and overall survival of the patients particularly in stage II CRC patients. However, promoter methylation was not associated with other clinocopathological characteristics such as age, gender, tumor location etc.
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Affiliation(s)
- Alok Kumar
- Department of Biotechnology, School for Bio-Science and Biotechnology, Babasaheb Bhimrao Ambedkar University, Lucknow, 226025, India
- Department of Pathology, Dr. Ram Manohar Lohia Institute of Medical Sciences, Lucknow, 226010, India
| | - Pradyumn Singh
- Department of Pathology, Dr. Ram Manohar Lohia Institute of Medical Sciences, Lucknow, 226010, India
| | - Anshuman Pandey
- Department of Surgical Gastroenterology, Dr. Ram Manohar Lohia Institute of Medical Science, Lucknow, 226010, India
| | - Sunil Babu Gosipatala
- Department of Biotechnology, School for Bio-Science and Biotechnology, Babasaheb Bhimrao Ambedkar University, Lucknow, 226025, India.
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Banerjee M, Kulhari K, Saha TK. Assessment of DNA Methylation in p15, p16 and E-Cadherin Genes as a Screening Tool for Early Carcinoma Cervix. Indian J Clin Biochem 2019; 35:423-429. [PMID: 33013011 DOI: 10.1007/s12291-019-00837-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 06/04/2019] [Indexed: 11/24/2022]
Abstract
Cancer cervix is diagnosed late in women due to anatomical inaccessibility of the area. Hence, a robust screening strategy will help detect carcinoma cervix early which will significantly decrease the mortality and morbidity due to this disease. We evaluated DNA methylation of three tumour suppressor genes p15, p16 and E-Cadherin on cervical smears to assess DNA methylation as a screening tool for detection of early cervical cancer in comparison to PAP smears. DNA was extracted from cervical smears of 20 cases and 30 controls. The DNA was bisulphite modified. Methylation specific PCR (MSP) was performed to assess the methylation status of the promoter region of each of the genes. MSP results were compared with PAP smears to assess the utility of DNA methylation of these genes in screening for cervical cancer. DNA methylation was detected in 55% subjects in p15 gene, 45% in p16 gene and 40% in E-Cadherin gene. This was statistically significant when compared to the controls. DNA methylation of E-Cadherin, and p15 genes as a panel has a sensitivity and specificity of 80% and 90% respectively, which is better than the sensitivity of PAP smear for detection of early cancer cervix. Increased DNA methylation is seen in p15, p16 and E-Cadherin genes in early cancer cervix. p15 and E-Cadherin in combination can be used as a screening tool for detection of early cancer cervix.
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Affiliation(s)
- M Banerjee
- All India Institute of Medical Sciences, Jodhpur, India
| | - K Kulhari
- Command Hospital Chandigarh, Chandimandir, India
| | - T K Saha
- Department of Biochemistry, Al Falah School of Medical Science and Research Centre, Faridabad, India
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Nesvet J, Rizzi G, Wang SX. Highly sensitive detection of DNA hypermethylation in melanoma cancer cells. Biosens Bioelectron 2019; 124-125:136-42. [PMID: 30366258 DOI: 10.1016/j.bios.2018.10.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 10/02/2018] [Accepted: 10/10/2018] [Indexed: 12/31/2022]
Abstract
Aberrant hypermethylation of CpG islands in the promoter region of tumor suppressor genes is a promising biomarker for early cancer detection. This methylation status is reflected in the methylation pattern of ctDNA shed from the primary tumor; however, to realize the full clinical utility of ctDNA methylation detection via liquid biopsy for early cancer diagnosis, improvements in the sensitivity and multiplexability of existing technologies must be improved. Additionally, the assay must be cheap and easy to perform in a clinical setting. We report the integration of methylation specific PCR (MSP) to melt curve analysis on giant magnetoresistive (GMR) biosensors to greatly enhance the sensitivity of our DNA hybridization assay for methylation detection. Our GMR sensor is functionalized with synthetic DNA probes that target methylated or unmethylated CpG sites in the MSP amplicon, and measures the difference in melting temperature (Tm) between the two probes (ΔTm), giving an analytical limit of detection down to 0.1% methylated DNA in solution. Additionally, linear regression of ΔTm's for serial dilutions of methylated:unmethylated mixtures allows for quantification of methylation percentage, which could have diagnostic and prognostic utility. Lastly, we performed multiplexed MSP on two different genes, and show the ability of our GMR assay to resolve this mixture, despite their amplicons' overlapping Tm's in standard EvaGreen melt analysis. The multiplexing ability of our assay and its enhanced sensitivity, without necessitating deep sequencing, represent important steps toward realizing an assay for the detection of methylated ctDNA in plasma for early cancer detection in a clinical setting.
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Laura B, Silvia P, Francesca F, Benedetta S, Carla C. Epigenetic control of defense genes following MeJA-induced priming in rice (O. sativa). J Plant Physiol 2018; 228:166-177. [PMID: 29936261 DOI: 10.1016/j.jplph.2018.06.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 06/08/2018] [Accepted: 06/09/2018] [Indexed: 05/23/2023]
Abstract
In plant defense, priming is a physiological process by which a plant prepares to more quickly or aggressively respond to a future biotic or abiotic stress. This unique physiological state can be induced by beneficial microbes or by treatment with natural or synthetic compounds. Priming has been described copiously, mainly in dicots, but the study on the molecular mechanisms regulating the phenomenon is still at its infancy. A fascinating possibility is that epigenetic changes may be the main actors on priming establishment. A more accessible chromatin structure, due to DNA methylation and/or histone modifications, could facilitate a quicker and more potent gene response to a subsequent attack. Here, we investigated the impact of methyl jasmonate (MeJA)-induced priming on the response efficacy to mechanical wounding of a monocot (Oryza sativa). In particular, we showed that MeJA primes plants for increased expression of defense-related genes, such as OsBBPI and OsPOX, upon wounding. Finally, we provided evidence that MeJA modulates histone modifications in the promoter region of OsBBPI, as well as changes at genome-wide DNA methylation level. Together these studies corroborate the importance of priming in strengthening plant defense and support the growing evidence that epigenetic regulation plays a pivotal role in priming onset.
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Affiliation(s)
- Bertini Laura
- Department of Ecological and Biological Sciences, University of Tuscia, Largo dell'Università, 01100, Viterbo, Italy.
| | - Proietti Silvia
- Department of Ecological and Biological Sciences, University of Tuscia, Largo dell'Università, 01100, Viterbo, Italy.
| | - Focaracci Francesca
- Department of Ecological and Biological Sciences, University of Tuscia, Largo dell'Università, 01100, Viterbo, Italy.
| | - Sabatini Benedetta
- Department of Ecological and Biological Sciences, University of Tuscia, Largo dell'Università, 01100, Viterbo, Italy.
| | - Caruso Carla
- Department of Ecological and Biological Sciences, University of Tuscia, Largo dell'Università, 01100, Viterbo, Italy.
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Giannopoulou L, Mastoraki S, Buderath P, Strati A, Pavlakis K, Kasimir-Bauer S, Lianidou ES. ESR1 methylation in primary tumors and paired circulating tumor DNA of patients with high-grade serous ovarian cancer. Gynecol Oncol 2018; 150:355-360. [PMID: 29807696 DOI: 10.1016/j.ygyno.2018.05.026] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 05/11/2018] [Accepted: 05/20/2018] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Estrogen receptor, coded by the ESR1 gene, is highly expressed in epithelial ovarian cancer. ESR1 gene is frequently methylated in many types of gynecological malignancies. However, only a few studies attempted to investigate the role of ESR1 methylation and its clinical significance in ovarian cancer so far. The aim of our study was to examine ESR1 methylation status in primary tumors and corresponding circulating tumor DNA of patients with high-grade serous ovarian cancer (HGSC). METHODS ESR1 methylation was detected by a highly specific and sensitive real-time methylation-specific PCR assay. Two groups of HGSC samples were analyzed: group A (n = 66 primary tumors) and group B (n = 53 primary tumors and 50 corresponding plasma samples). RESULTS ESR1 was found methylated in both groups of primary tumors: in 32/66 (48.5%) of group A and in 15/53 (28.3%) of group B. 19/50 (38.0%) corresponding plasma samples of group B were also methylated for ESR1. A significant agreement for ESR1 methylation was observed between primary tumors and paired plasma ctDNA samples (P = 0.004). Interestingly, the presence of ESR1 methylation in primary tumor samples of group B was significantly correlated with a better overall survival (P = 0.027) and progression-free survival (P = 0.041). CONCLUSIONS We report for the first time the presence of ESR1 methylation in plasma ctDNA of patients with HGSC. The agreement between ESR1 methylation in primary tumors and paired ctDNA is statistically significant. Our results indicate a correlation between the presence of ESR1 methylation and a better clinical outcome in HGSC patients.
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Affiliation(s)
- Lydia Giannopoulou
- Analysis of Circulating Tumor Cells Lab, Lab of Analytical Chemistry, Department of Chemistry, University of Athens, University Campus, Athens 15771, Greece
| | - Sophia Mastoraki
- Analysis of Circulating Tumor Cells Lab, Lab of Analytical Chemistry, Department of Chemistry, University of Athens, University Campus, Athens 15771, Greece
| | - Paul Buderath
- Department of Gynecology and Obstetrics, University Hospital of Essen, University of Duisburg-Essen, Hufelandstrasse 55, Essen D-45122, Germany
| | - Areti Strati
- Analysis of Circulating Tumor Cells Lab, Lab of Analytical Chemistry, Department of Chemistry, University of Athens, University Campus, Athens 15771, Greece
| | - Kitty Pavlakis
- Pathology Department, IASO women's hospital, 15123 Marousi, Athens, Greece
| | - Sabine Kasimir-Bauer
- Department of Gynecology and Obstetrics, University Hospital of Essen, University of Duisburg-Essen, Hufelandstrasse 55, Essen D-45122, Germany
| | - Evi S Lianidou
- Analysis of Circulating Tumor Cells Lab, Lab of Analytical Chemistry, Department of Chemistry, University of Athens, University Campus, Athens 15771, Greece.
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Yadav MK, Manoli NM, Vimalraj S, Madhunapantula SV. Unmethylated promoter DNA correlates with p53 expression and apoptotic levels only in Vitamin B9 and B12 deficient megaloblastic anemia but not in non-megaloblastic anemia controls. Int J Biol Macromol 2017; 109:76-84. [PMID: 29246873 DOI: 10.1016/j.ijbiomac.2017.12.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 11/13/2017] [Revised: 12/08/2017] [Accepted: 12/11/2017] [Indexed: 12/12/2022]
Abstract
Cyanocobalamin (Vitamin B12, VB12) and Folic acid (Vitamin B9, VB9) deficiency leads to anemia in women. We have recently shown low VB12 and VB9 levels in the serum of megaloblastic anemia (MBA) patients. Further, our study demonstrated elevated homocysteine and p53, respectively, in the serum and bone marrow aspirates of MBA patients but not in non-MBA subjects. However, it is unknown whether any gender specific variation in VB12 and VB9 level exists in MBA and non-MBA patients? In addition, it is unclear whether low VB12 and VB9 has a role in the regulation of p53 expression in MBA patients? And whether elevated p53 is functionally active? If so, does bone marrow aspirates of MBA patients show elevated apoptosis. Hence, we have analyzed VB12 and VB9 levels in MBA patients and compared with non-MBA subjects. Next, methylation status of p53 promoter was determined and correlated with p53 expression. Furthermore, the level of apoptosis in bone marrow aspirate paraffin blocks was estimated using TUNEL staining. In conclusion, low VB12 and VB9 in male and female patients directly correlate with p53 promoter unmethylation status, but, inversely correlate with p53 protein expression and its activity, only in MBA cases but not in non-MBA controls.
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Affiliation(s)
- Manish K Yadav
- Center of Excellence in Molecular Biology and Regenerative Medicine (CEMR), Department of Biochemistry, JSS Medical College, Jagadguru Sri Shivarathreeshwara University (Accredited "A" Grade by NAAC and Ranked 45 by National Institutional Ranking Framework (NIRF)-2016, Ministry of Human Resource Development, Government of India), Mysuru, 570015, Karnataka, India
| | - Nandini M Manoli
- Department of Pathology, JSS Medical College, Jagadguru Sri Shivarathreeshwara University (Accredited "A" Grade by NAAC and Ranked 45 by National Institutional Ranking Framework (NIRF)-2016, Ministry of Human Resource Development, Government of India), Mysuru, 570015, Karnataka, India
| | - Selvaraj Vimalraj
- Vascular Biology Lab, AU-KBC Research Centre, MIT campus, Anna University, Chennai, 600044, Tamil Nadu, India.
| | - SubbaRao V Madhunapantula
- Center of Excellence in Molecular Biology and Regenerative Medicine (CEMR), Department of Biochemistry, JSS Medical College, Jagadguru Sri Shivarathreeshwara University (Accredited "A" Grade by NAAC and Ranked 45 by National Institutional Ranking Framework (NIRF)-2016, Ministry of Human Resource Development, Government of India), Mysuru, 570015, Karnataka, India.
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Bhat AA, Wani HA, Waza AA, Malik RA, Masood A, Jeelani S, Kadla S, Majid S. Diminished expression of MGMT & RASSF1A genes in gastric cancer in ethnic population of Kashmir. J Gastrointest Oncol 2016; 7:989-995. [PMID: 28078123 DOI: 10.21037/jgo.2016.06.07] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Cancer initiation and progression are accompanied by profound changes in DNA. DNA methylation that was the first epigenetic alterations identified in cancer. DNA hypermethylation at promoter sites is closely associated with down regulation of protein and as major participant in the development and progression of series of human tumors. Therefore we hypothesized that promoter hypermethylation of RASSF1A & MGMT gene could influence susceptibility to gastric cancer (GC) as well, and we conducted this study to test the hypothesis in Kashmiri population. METHODS A hospital based case-control study; including 200 GC cases and 200 matched controls from patients who went surgical resection. Promoter hypermethylation was determined by Methylation Specific Polymerase chain reaction. The expression of MGMT & RASSF1A protein was examined by Western blotting technique. RESULTS Frequency of promoter region hypermethylation of MGMT gene were 46.5% in cases and 5.5% in controls (P<0.05) while as in case of RASSF1A frequency was 44% in cases and 4.5% in controls (P<0.05). Further, frequency of hypermethylation of both genes was found predominant in males, aged and advanced pathological stage subjects. Loss of MGMT expression was found in 46.5% cases (P<0.05) while as loss of RASSF1A expression was found in 40.5% cases (P<0.05). In both genes a positive correlation was observed between promoter CpG island hypermethylation and down regulation of respective proteins. CONCLUSIONS These findings indicate that promoter hypermethylation at CpG island may be responsible for reduction of expression at protein level which may be an initial event in carcinogenesis and the progression of GC.
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Affiliation(s)
- Arif Akbar Bhat
- Department of Biochemistry, Government Medical College Srinagar (Research Centre University of Kashmir), Srinagar, India
| | - Hilal Ahmad Wani
- Multidisciplinary Research Unit, Government Medical College Srinagar, Srinagar, India
| | - Ajaz Ahmad Waza
- Department of Biotechnology, University of Kashmir, Hazratbal Srinagar, India
| | | | - Akbar Masood
- Department of Biochemistry, University of Kashmir, Hazratbal Srinagar, Srinagar, India
| | | | | | - Sabhiya Majid
- Department of Biochemistry, Government Medical College Srinagar (Research Centre University of Kashmir), Srinagar, India
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Abstract
A variety of molecular assays have been developed for CTCs detection and molecular characterization. Molecular assays are based on the nucleic acid analysis in CTCs and are based on total RNA isolation and subsequent mRNA quantification of specific genes, or isolation of genomic DNA that can be for DNA methylation studies and mutation analysis. This review is mainly focused on gene expression and methylation studies in CTCs in various types of cancer.
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Affiliation(s)
- Evi S Lianidou
- Analysis of Circulating Tumor Cells Lab, Lab of Analytical Chemistry, Department of Chemistry, University of Athens, 15771, Greece.
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Tang C, Li Y, Lin X, Ye J, Li W, He Z, Li F, Cai X. Prolactin increases tumor necrosis factor alpha expression in peripheral CD14 monocytes of patients with rheumatoid arthritis. Cell Immunol 2014; 290:164-8. [PMID: 24997655 DOI: 10.1016/j.cellimm.2014.06.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [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: 03/02/2014] [Revised: 05/23/2014] [Accepted: 06/17/2014] [Indexed: 11/29/2022]
Abstract
Tumor necrosis factor (TNF)-α is one of the major proinflammatory mediators of rheumatic arthritis (RA); the regulatory factors for TNF-α release is not fully understood. This study aims to investigate the role of prolactin receptor (PRLR) activation in regulating the expression and release of TNF-α from CD14(+) monocytes. The results showed that the expression of PRLR was detectable in CD14(+) monocytes of healthy subjects, which was markedly increased in RA patients. Exposure to PRL in the culture increased the expression and release of TNF-α from CD14(+) monocytes, which was abolished by the PRLR gene silencing or blocking the mitogen activated protein (MAPK) pathway. We conclude that exposure to PRL increases TNF-α release from CD14(+) monocytes of RA patients, which can be abolished by PRLR gene silencing or treating with MAPK inhibitor.
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Affiliation(s)
- Chun Tang
- Department of Rheumatology, Guangzhou First People's Hospital, Guangzhou Medical University, 1 Panfu Road, Guangzhou, China
| | - Yun Li
- Department of Cardiothoracic Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Xiaojun Lin
- Department of Rheumatology, Guangzhou First People's Hospital, Guangzhou Medical University, 1 Panfu Road, Guangzhou, China
| | - Jinghua Ye
- Department of Rheumatology, Guangzhou First People's Hospital, Guangzhou Medical University, 1 Panfu Road, Guangzhou, China
| | - Weinian Li
- Department of Rheumatology, Guangzhou First People's Hospital, Guangzhou Medical University, 1 Panfu Road, Guangzhou, China
| | - Zhixiang He
- Department of Rheumatology, Guangzhou First People's Hospital, Guangzhou Medical University, 1 Panfu Road, Guangzhou, China
| | - Fangfei Li
- Department of Rheumatology, Guangzhou First People's Hospital, Guangzhou Medical University, 1 Panfu Road, Guangzhou, China
| | - Xiaoyan Cai
- Department of Rheumatology, Guangzhou First People's Hospital, Guangzhou Medical University, 1 Panfu Road, Guangzhou, China.
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Arya S, Majaid MA, Shwetha SD, Sravani K, Arivazhagan A, Sampath S, Santosh V. Implications of MGMT methylation status in pituitary adenoma. Pathol Res Pract 2014; 210:407-11. [PMID: 24690322 DOI: 10.1016/j.prp.2014.02.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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: 02/23/2013] [Revised: 09/04/2013] [Accepted: 02/13/2014] [Indexed: 10/25/2022]
Abstract
BACKGROUND Very little literature exists on frequency of MGMT methylation status in pituitary adenoma. We assessed the frequency of MGMT methylation and protein expression in pituitary adenoma and correlated with patients' age group and prognosis. METHODS Tumor tissues from 30 patients with pituitary adenoma were evaluated for MGMT promoter methylation status by methylation specific PCR method. All tumors were also immunostained with MIB-1, anti-p53 and anti-MGMT antibodies. RESULTS MGMT methylation status was noted in 40% of cases (7/20 non-functioning adenomas and 5/10 functioning adenomas). MGMT protein expression on IHC was noted in 72.2% of unmethylated tumors, while only 41.6% of methylated tumors demonstrated protein expression. The mean labeling index of MGMT protein was higher in unmethylated tumors as compared to the methylated group, though the difference was not statistically significant (18.6% vs 8.8%; p=0.131). Tumor regrowth occurred in four unmethylated tumors as compared to none in methylated group. Even though there was no correlation between patient age and MGMT methylation status (p=0.823), we noted that the frequency of methylation in middle age patients (between 30 and 59 yrs) was 64.7%, which was higher compared to other age groups. CONCLUSION This is the first study from India showing MGMT promoter methylation status with protein expression in pituitary adenoma. We noted that tumor regrowth was higher in unmethylated tumors.
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Affiliation(s)
- Sneha Arya
- Department of Neuropathology, National Institute of Mental Health and NeuroSciences, Bangalore, India
| | - M A Majaid
- Department of Neurosurgery, National Institute of Mental Health and NeuroSciences, Bangalore, India
| | - S D Shwetha
- Department of Neuropathology, National Institute of Mental Health and NeuroSciences, Bangalore, India
| | - K Sravani
- Department of Neuropathology, National Institute of Mental Health and NeuroSciences, Bangalore, India
| | - A Arivazhagan
- Department of Neurosurgery, National Institute of Mental Health and NeuroSciences, Bangalore, India.
| | - S Sampath
- Department of Neurosurgery, National Institute of Mental Health and NeuroSciences, Bangalore, India
| | - V Santosh
- Department of Neuropathology, National Institute of Mental Health and NeuroSciences, Bangalore, India
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13
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Keeley B, Stark A, Pisanic TR, Kwak R, Zhang Y, Wrangle J, Baylin S, Herman J, Ahuja N, Wang J. Extraction and processing of circulating DNA from large sample volumes using methylation on beads for the detection of rare epigenetic events. Clin Chim Acta 2013; 425:169-75. [PMID: 23911908 PMCID: PMC3963364 DOI: 10.1016/j.cca.2013.07.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/16/2013] [Accepted: 07/17/2013] [Indexed: 12/18/2022]
Abstract
The use of methylated tumor-specific circulating DNA has shown great promise as a potential cancer biomarker. Nonetheless, the relative scarcity of tumor-specific circulating DNA presents a challenge for traditional DNA extraction and processing techniques. Here we demonstrate a single tube extraction and processing technique dubbed "methylation on beads" that allows for DNA extraction and bisulfite conversion for up to 2 ml of plasma or serum. In comparison to traditional techniques including phenol chloroform and alcohol extraction, methylation on beads yields a 1.5- to 5-fold improvement in extraction efficiency. The technique results in far less carryover of PCR inhibitors yielding analytical sensitivity improvements of over 25-fold. The combination of improved recovery and sensitivity make possible the detection of rare epigenetic events and the development of high sensitivity epigenetic diagnostic assays.
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Affiliation(s)
- Brian Keeley
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218
| | - Alejandro Stark
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218
| | | | - Ruby Kwak
- Cancer Biology Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21287
| | - Yi Zhang
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218
| | - John Wrangle
- Cancer Biology Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21287
| | - Stephen Baylin
- Cancer Biology Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21287
| | - James Herman
- Cancer Biology Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21287
| | - Nita Ahuja
- Cancer Biology Program, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21287
| | - Jeff Wang
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218
- Johns Hopkins Institute for NanoBioTechnology, Baltimore, MD 21218
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218
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14
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Abbey D, Seshagiri PB. Aza-induced cardiomyocyte differentiation of P19 EC-cells by epigenetic co-regulation and ERK signaling. Gene 2013; 526:364-73. [PMID: 23747406 DOI: 10.1016/j.gene.2013.05.044] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 05/01/2013] [Accepted: 05/15/2013] [Indexed: 11/15/2022]
Abstract
Stem cells in cell based therapy for cardiac injury is being potentially considered. However, genetic regulatory networks involved in cardiac differentiation are not clearly understood. Among stem cell differentiation models, mouse P19 embryonic carcinoma (EC) cells, are employed for studying (epi)genetic regulation of cardiomyocyte differentiation. Here, we comprehensively assessed cardiogenic differentiation potential of 5-azacytidine (Aza) on P19 EC-cells, associated gene expression profiles and the changes in DNA methylation, histone acetylation and activated-ERK signaling status during differentiation. Initial exposure of Aza to cultured EC-cells leads to an efficient (55%) differentiation to cardiomyocyte-rich embryoid bodies with a threefold (16.8%) increase in the cTnI+ cardiomyocytes. Expression levels of cardiac-specific gene markers i.e., Isl-1, BMP-2, GATA-4, and α-MHC were up-regulated following Aza induction, accompanied by differential changes in their methylation status particularly that of BMP-2 and α-MHC. Additionally, increases in the levels of acetylated-H3 and pERK were observed during Aza-induced cardiac differentiation. These studies demonstrate that Aza is a potent cardiac inducer when treated during the initial phase of differentiation of mouse P19 EC-cells and its effect is brought about epigenetically and co-ordinatedly by hypo-methylation and histone acetylation-mediated hyper-expression of cardiogenesis-associated genes and involving activation of ERK signaling.
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Affiliation(s)
- Deepti Abbey
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560 012, India
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15
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Abbaszadegan MR, Moaven O, Sima HR, Ghafarzadegan K, A'rabi A, Forghani MN, Raziee HR, Mashhadinejad A, Jafarzadeh M, Esmaili-Shandiz E, Dadkhah E. p16 promoter hypermethylation: A useful serum marker for early detection of gastric cancer. World J Gastroenterol 2008; 14:2055-60. [PMID: 18395906 PMCID: PMC2701527 DOI: 10.3748/wjg.14.2055] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To determine p16 promoter hypermethylation in gastric tumoral tissue and serum samples, its impact on p16-protein expression, and correlation with clinical and histological features.
METHODS: Samples were obtained from 52 histologically confirmed cases of gastric adenocarcinoma. Gastric tissue and serum of 50 age- and sex-matched individuals with normal gastroscopy and biopsy were obtained as control samples. Methylation-specific polymerase chain reaction (MSP) was used to evaluate methylation status of p16 promoter. p16-protein expression was analyzed by immunohistochemical staining on paraffin-embedded sections.
RESULTS: Methylation was detected in 44.2% (23/52) of tumoral tissues. 60.9% of them were also methylated in serum, i.e., 26.9% of all patients (14/52). Methylation was not detected in tissue and sera of control samples. p16-protein expression was decreased in 61.5% of cases (32/52), and was significantly associated with promoter hypermethylation (P < 0.001). Methylation was significantly more frequent in higher pathological grades (P < 0.05). Methylation was not associated with other clinicopathological features and environmental factors including H pylori infection and smoking.
CONCLUSION: p16 promoter hypermethylation is an important event in gastric carcinogenesis. It is the principle mechanism of p16 gene silencing. It is related to malignant tumor behavior. Detection of DNA methylation in serum may be a biomarker for early detection of gastric cancer.
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Abstract
AIM: To investigate the critical regions and spreading of the Runx3 CpG island methylation in human gastric cancer.
METHODS: MSP and Western blot were used for 26 human primary gastric cancer samples and corresponding non-neoplastic gastric mucosa to detect the methylation status in successive six regions ranging from the most 5' region to the transcription start site within the Runx3 CpG island and the expression levels of Runx3 protein, respectively.
RESULTS: The methylation frequencies in the successive six regions calculated by the results of MSP decreased gradually with the regions spreading to the transcription start site. The differences between cancer group and non-neoplastic group arose in the 3rd region, and became significant in the 5th and 6th regions (P < 0.05). When the grouping was related to the differentiation extent, the differences were significant in the 3rd-6th regions between poorly differentiated group and well differentiated group (P < 0.05). As far as the expression levels of Runx3 protein were concerned, the differences were significant between gastric cancer group and non-neoplastic group (0.499 ± 0.106 vs 0.721 ± 0.080, P < 0.01), as well as between poorly differentiated group and well differentiated group(0.437 ± 0.053 vs 0.617 ± 0.073, P < 0.01).
CONCLUSION: Methylation of the Runx3 CpG island spreads from the most 5' region to the transcription start site in human gastric cancer, and the spreading is related to the differentiation extent of tumor. The transcription start site may be a critical region for the methylation of Runx3.
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