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Almeida RS, Wisnieski F, Takao Real Karia B, Smith MAC. CRISPR/Cas9 Genome-Editing Technology and Potential Clinical Application in Gastric Cancer. Genes (Basel) 2022; 13:2029. [PMID: 36360266 PMCID: PMC9690943 DOI: 10.3390/genes13112029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 10/20/2022] [Revised: 10/31/2022] [Accepted: 11/01/2022] [Indexed: 10/09/2023] Open
Abstract
Gastric cancer is the subject of clinical and basic studies due to its high incidence and mortality rates worldwide. Due to the diagnosis occurring in advanced stages and the classic treatment methodologies such as gastrectomy and chemotherapy, they are extremely aggressive and limit the quality of life of these patients. CRISPR/Cas9 is a tool that allows gene editing and has been used to explore the functions of genes related to gastric cancer, in addition to being used in the treatment of this neoplasm, greatly increasing our understanding of cancer genomics. In this mini-review, we seek the current status of the CRISPR/Cas9 gene-editing technology in gastric cancer research and clinical research.
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Affiliation(s)
- Renata Sanches Almeida
- Discipline of Genetics, Department of Morphology and Genetics, Federal University of São Paulo, Rua Botucatu, 740, São Paulo 04023900, Brazil
| | - Fernanda Wisnieski
- Discipline of Genetics, Department of Morphology and Genetics, Federal University of São Paulo, Rua Botucatu, 740, São Paulo 04023900, Brazil
- Discipline of Gastroenterology, Department of Medicine, Federal University of São Paulo, Rua Loefgreen, 1726, São Paulo 04040002, Brazil
| | - Bruno Takao Real Karia
- Discipline of Genetics, Department of Morphology and Genetics, Federal University of São Paulo, Rua Botucatu, 740, São Paulo 04023900, Brazil
| | - Marilia Arruda Cardoso Smith
- Discipline of Genetics, Department of Morphology and Genetics, Federal University of São Paulo, Rua Botucatu, 740, São Paulo 04023900, Brazil
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2
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Santos MP, Pereira JN, Delabio RW, Smith MAC, Payão SLM, Carneiro LC, Barbosa MS, Rasmussen LT. Increased expression of interleukin-6 gene in gastritis and gastric cancer. Braz J Med Biol Res 2021; 54:e10687. [PMID: 34008757 PMCID: PMC8130133 DOI: 10.1590/1414-431x2020e10687] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 02/26/2021] [Indexed: 01/13/2023] Open
Abstract
Helicobacter pylori (H. pylori) induces an intense inflammatory response, mediated by proinflammatory cytokines, including interleukin (IL)-6 and its membrane receptor (IL-6R), which activates important signaling pathways in the development of gastric disease and cancer. We investigated the gene and protein expression of IL-6 and IL-6R and the influence of polymorphisms rs1800795, rs1800796, and rs1800797 on its gene expression together with H. pylori infection. Furthermore, an in-silico analysis was performed to support our results. Gastric biopsies were obtained from patients with gastric symptoms and patients with gastric cancer (GC) and were divided into groups (Control, Gastritis, and Cancer). H. pylori was detected by PCR. Real-time-qPCR was employed to determine gene expression, and western blot assay was used to analyze protein expression levels. PCR-RFLP was used to characterize IL-6 polymorphisms. Bioinformatics analyses were performed using the Gene Expression Omnibus (GEO) database and GEO2R to screen out differentially expressed genes (DEGs). H. pylori was detected in 43.3% of the samples. Statistically significant differences were found for IL-6 (P=0.0001) and IL-6R (P=0.0005) genes among the three groups, regardless of the presence of H. pylori. Among patients with H. pylori infection, the IL-6 and IL-6R gene and protein expressions were significantly increased, highlighting IL-6 gene overexpression in patients with GC. No statistically significant differences were found for the rs1800795, rs1800796, and rs1800797 polymorphisms compared to IL-6 gene expression. The results indicated that the IL-6 polymorphisms do not influence its expression, but IL-6 and IL-6R expression seems to be altered by the presence of H. pylori.
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Affiliation(s)
- M P Santos
- Laboratório de Genética, Faculdade de Medicina de Marília, Marília, SP, Brasil
| | - J N Pereira
- Laboratório de Genética, Faculdade de Medicina de Marília, Marília, SP, Brasil
| | - R W Delabio
- Laboratório de Genética, Faculdade de Medicina de Marília, Marília, SP, Brasil
| | - M A C Smith
- Departamento de Morfologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - S L M Payão
- Laboratório de Genética, Faculdade de Medicina de Marília, Marília, SP, Brasil
| | - L C Carneiro
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - M S Barbosa
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, GO, Brasil
| | - L T Rasmussen
- Laboratório de Genética, Faculdade de Medicina de Marília, Marília, SP, Brasil
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Wisnieski F, Geraldis JC, Santos LC, Leal MF, Calcagno DQ, Gigek CO, Chen ES, Anauate AC, Artigiani R, Demachki S, Assumpção PP, Lourenço LG, Arasaki CH, Krainer J, Pabinger S, Burbano RR, Smith MAC. Differential regulation of LRRC37A2 in gastric cancer by DNA methylation. Epigenetics 2021; 17:110-116. [PMID: 33491552 DOI: 10.1080/15592294.2021.1878724] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Gastric cancer (GC) is one of the leading types of fatal cancer worldwide. Epigenetic manipulation of cancer cells is a useful tool to better understand gene expression regulatory mechanisms and contributes to the discovery of novel biomarkers. Our research group recently reported a list of 83 genes that are potentially modulated by DNA methylation in GC cell lines. Herein, we further explored the regulation of one of these genes, LRRC37A2, in clinical samples. LRRC37A2 expression was evaluated by RT-qPCR, and DNA methylation was studied using next-generation bisulphite sequencing in 36 GC and paired adjacent nonneoplastic tissue samples. We showed that both reduced LRRC37A2 mRNA levels and increased LRRC37A2 exon methylation were associated with undifferentiated and poorly differentiated tumours. Moreover, LRRC37A2 gene expression and methylation levels were inversely correlated at the +45 exon CpG site. We suggest that DNA hypermethylation may contribute to reducing LRRC37A2 expression in undifferentiated and poorly differentiated GC. Therefore, our results show how some genes may be useful to stratify patients who are more likely to benefit from epigenetic therapy.Abbreviations: AR: androgen receptor; 5-AZAdC: 5-aza-2'-deoxycytidine; B2M: beta-2-microglobulin; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; GC: gastric cancer; GLM: general linear model; LRRC37A2: leucine-rich repeat containing 37 member A2; SD: standard deviation; TFII-I: general transcription factor II-I; TSS: transcription start site; XBP1: X-box binding protein 1.
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Affiliation(s)
- Fernanda Wisnieski
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, São Paulo, Brazil.,Disciplina de Gastroenterologia, Departamento de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Jaqueline Cruz Geraldis
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Leonardo Caires Santos
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Mariana Ferreira Leal
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, São Paulo, Brazil.,Universidade Federal do Pará, Belém, Brazil
| | | | | | - Elizabeth Suchi Chen
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Ana Carolina Anauate
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Ricardo Artigiani
- Departamento de Patologia, Universidade Federal de São Paulo, São Paulo, Brazil
| | | | | | - Laercio Gomes Lourenço
- Disciplina de Gastroenterologia Cirúrgica, Departamento de Cirurgia, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Carlos Haruo Arasaki
- Disciplina de Gastroenterologia Cirúrgica, Departamento de Cirurgia, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Julie Krainer
- Center for Health & Bioresources, Austrian Institute of Technology, Vienna, Austria
| | - Stephan Pabinger
- Center for Health & Bioresources, Austrian Institute of Technology, Vienna, Austria
| | - Rommel Rodriguez Burbano
- Universidade Federal do Pará, Belém, Brazil.,Laboratório de Biologia Molecular, Hospital Ophir Loyola, Belém, Brazil
| | - Marilia Arruda Cardoso Smith
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, São Paulo, Brazil
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Wisnieski F, Santos LC, Calcagno DQ, Geraldis JC, Gigek CO, Anauate AC, Chen ES, Rasmussen LT, Payão SLM, Artigiani R, Demachki S, Assumpção PP, Lourenço LG, Arasaki CH, Pabinger S, Krainer J, Leal MF, Burbano RR, Arruda Cardoso Smith M. The impact of DNA demethylation on the upregulation of the NRN1 and TNFAIP3 genes associated with advanced gastric cancer. J Mol Med (Berl) 2020; 98:707-717. [PMID: 32285140 DOI: 10.1007/s00109-020-01902-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 09/17/2019] [Revised: 03/10/2020] [Accepted: 03/18/2020] [Indexed: 12/24/2022]
Abstract
Gastric cancer (GC) is the third leading cause of cancer-related death worldwide. Very few therapeutic options are currently available in this neoplasia. The use of 5-Aza-2'-deoxycytidine (5-AZAdC) was approved for the treatment of myelodysplastic syndromes, and this drug can treat solid tumours at low doses. Epigenetic manipulation of GC cell lines is a useful tool to better understand gene expression regulatory mechanisms for clinical applications. Therefore, we compared the gene expression profile of 5-AZAdC-treated and untreated GC cell lines by a microarray assay. Among the genes identified in this analysis, we selected NRN1 and TNFAIP3 to be evaluated for gene expression by RT-qPCR and DNA methylation by bisulfite DNA next-generation sequencing in 43 and 52 pairs of GC and adjacent non-neoplastic tissue samples, respectively. We identified 83 candidate genes modulated by DNA methylation in GC cell lines. Increased expression of NRN1 and TNFAIP3 was associated with advanced tumours (P < 0.05). We showed that increased NRN1 and TNFAIP3 expression seems to be regulated by DNA demethylation in GC samples: inverse correlations between the mRNA and DNA methylation levels in the promoter of NRN1 (P < 0.05) and the intron of TNFAIP3 (P < 0.05) were detected. Reduced NRN1 promoter methylation was associated with III/IV TNM stage tumours (P = 0.03) and the presence of Helicobacter pylori infection (P = 0.02). The identification of demethylated activated genes in GC may be useful in clinical practice, stratifying patients who are less likely to benefit from 5-AZAdC-based therapies. KEY MESSAGES: Higher expression of NRN1 and TNFAIP3 is associated with advanced gastric cancer (GC). NRN1 promoter hypomethylation contributes to gene upregulation in advanced GC. TNFAIP3 intronic-specific CpG site demethylation contributes to gene upregulation in GC. These findings may be useful to stratify GC patients who are less likely to benefit from DNA demethylating-based therapies.
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Affiliation(s)
- Fernanda Wisnieski
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil. .,Disciplina de Gastroenterologia, Departamento de Medicina, Universidade Federal de São Paulo, Rua Loefgreen, 1726, São Paulo, São Paulo, 04040002, Brazil.
| | - Leonardo Caires Santos
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil
| | - Danielle Queiroz Calcagno
- Programa de Pós-graduação em Oncologia e Ciências Médicas, Universidade Federal do Pará, Rua dos Mundurucus, 4487, Belém, Pará, 66073-000, Brazil
| | - Jaqueline Cruz Geraldis
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil
| | - Carolina Oliveira Gigek
- Departamento de Patologia, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil
| | - Ana Carolina Anauate
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil
| | - Elizabeth Suchi Chen
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil
| | - Lucas Trevizani Rasmussen
- Disciplina de Genética, Hemocentro da Faculdade de Medicina de Marília, Rua Lourival Freire, 240, Marília, São Paulo, 17519-050, Brazil
| | - Spencer Luiz Marques Payão
- Disciplina de Genética, Hemocentro da Faculdade de Medicina de Marília, Rua Lourival Freire, 240, Marília, São Paulo, 17519-050, Brazil
| | - Ricardo Artigiani
- Departamento de Patologia, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil
| | - Samia Demachki
- Programa de Pós-graduação em Oncologia e Ciências Médicas, Universidade Federal do Pará, Rua dos Mundurucus, 4487, Belém, Pará, 66073-000, Brazil
| | - Paulo Pimentel Assumpção
- Programa de Pós-graduação em Oncologia e Ciências Médicas, Universidade Federal do Pará, Rua dos Mundurucus, 4487, Belém, Pará, 66073-000, Brazil
| | - Laercio Gomes Lourenço
- Disciplina de Gastroenterologia Cirúrgica, Departamento de Cirurgia, Universidade Federal de São Paulo, R. Napoleão de Barros, 715, São Paulo, 04024002, Brazil
| | - Carlos Haruo Arasaki
- Disciplina de Gastroenterologia Cirúrgica, Departamento de Cirurgia, Universidade Federal de São Paulo, R. Napoleão de Barros, 715, São Paulo, 04024002, Brazil
| | - Stephan Pabinger
- Austrian Institute of Technology, Center for Health & Bioresources, Molecular Diagnostics, Giefinggasse 4, 1210, Vienna, Austria
| | - Julie Krainer
- Austrian Institute of Technology, Center for Health & Bioresources, Molecular Diagnostics, Giefinggasse 4, 1210, Vienna, Austria
| | - Mariana Ferreira Leal
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil.,Programa de Pós-graduação em Oncologia e Ciências Médicas, Universidade Federal do Pará, Rua dos Mundurucus, 4487, Belém, Pará, 66073-000, Brazil
| | - Rommel Rodriguez Burbano
- Programa de Pós-graduação em Oncologia e Ciências Médicas, Universidade Federal do Pará, Rua dos Mundurucus, 4487, Belém, Pará, 66073-000, Brazil.,Laboratório de Biologia Molecular, Hospital Ophir Loyola, Avenida Governador Magalhães, 992, Belém, 66063-240, Brazil
| | - Marilia Arruda Cardoso Smith
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, São Paulo, 04023900, Brazil.
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Belangero SI, Ota VK, Gadelha A, Berberian AA, Assunção-Leme IBD, Noto C, Christofolini DM, Bellucco FT, Santoro ML, Mazzotti DR, Zugman A, Melaragno MI, Smith MAC, Pellegrino R, Hakonarson H, Cordeiro Q, Moretti PN, Bressan RA, Mari JDJ, Jackowski AP. DGCR2 influences cortical thickness through a mechanism independent of schizophrenia pathogenesis. Psychiatry Res 2019; 274:391-394. [PMID: 30901624 DOI: 10.1016/j.psychres.2019.02.068] [Citation(s) in RCA: 3] [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: 07/23/2018] [Revised: 01/03/2019] [Accepted: 02/27/2019] [Indexed: 01/17/2023]
Abstract
We investigated the role of DGCR2, a corticogenesis-related gene, on schizophrenia (SZ) and its subphenotypes, including brain morphology. A total of 221 SZ patients, 263 controls and 70 antipsychotic-naïve first episode of psychosis (FEP) were genotyped for 17 DGCR2 polymorphisms. While no association between DGCR2 polymorphisms and SZ was found, the missense variant rs2072123 was associated to left rostral anterior cingulate thickness, showing that DGCR2 seems not to be associated directly with the SZ but might be influencing the brain morphology. We also showed a DGCR2 downregulation in SZ patients when compared to controls and FEP.
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Affiliation(s)
- Sintia Iole Belangero
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil.
| | - Vanessa Kiyomi Ota
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Ary Gadelha
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Arthur Almeida Berberian
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Idaiane Batista de Assunção-Leme
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Cristiano Noto
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Denise Maria Christofolini
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Department of Collective Health, Faculdade de Medicina do ABC, Human Reproduction and Genetic Center, Santo André, Brazil
| | - Fernanda Teixeira Bellucco
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Marcos Leite Santoro
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Diego Robles Mazzotti
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, PA, United States
| | - André Zugman
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Maria Isabel Melaragno
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Marilia Arruda Cardoso Smith
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Renata Pellegrino
- Center for Applied Genomics, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Hakon Hakonarson
- Center for Applied Genomics, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Quirino Cordeiro
- Departamento de Psiquiatria, Santa Casa School of Medical Sciences, São Paulo, Brazil
| | - Patricia Natalia Moretti
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Faculdade de Medicina, Universidade de Brasília (UNB), Brasília, Brazil
| | - Rodrigo Affonseca Bressan
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Jair de Jesus Mari
- Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Andrea Parolin Jackowski
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil; Departamento de Psiquiatria, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
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Oliveira FF, Almeida SS, Chen ES, Cardoso Smith MA, Ferreira Bertolucci PH. P1‐172: COGNITIVE CHANGES ARE PHARMACOGENETICALLY MEDIATED BY ANGIOTENSIN‐CONVERTING ENZYME INHIBITORS IN PATIENTS WITH ALZHEIMER'S DISEASE DEMENTIA. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Ferreira de Oliveira F, Soares de Almeida S, Chen ES, Cardoso Smith MA, Graça Naffah-Mazzacoratti M, Ferreira Bertolucci PH. P4‐156: GENETICALLY MEDIATED LIFETIME RISK FACTORS FOR COGNITIVE AND FUNCTIONAL DECLINE IN PATIENTS WITH ALZHEIMER'S DEMENTIA FROM SÃO PAULO, BRAZIL. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.2561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Marques Payao SL, Pereira AR, Soriani ML, Rasmussen LT, Santos MP, Willian de Labio R, Ferreira Bertolucci PH, Cardoso Smith MA. P2‐138: GENE EXPRESSION AND ‐850 C/T AND ‐308 G/A POLYMORPHISMS OF THE
TNF
GENE IN ALZHEIMER'S DISEASE. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ferreira de Oliveira F, Soares de Almeida S, Chen ES, Cardoso Smith MA, Ferreira Bertolucci PH. P3‐282:
APOE
‐DEPENDENT PSYCHOTROPIC EFFECTS OVER CLINICAL CHANGES IN ALZHEIMER'S DISEASE DEMENTIA. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.1642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Gigek CO, Calcagno DQ, Rasmussen LT, Santos LC, Leal MF, Wisnieski F, Burbano RR, Lourenço LG, Lopes-Filho GJ, Smith MAC. Genetic variants in gastric cancer: Risks and clinical implications. Exp Mol Pathol 2017; 103:101-111. [PMID: 28736214 DOI: 10.1016/j.yexmp.2017.07.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [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: 04/19/2017] [Revised: 07/03/2017] [Accepted: 07/19/2017] [Indexed: 12/14/2022]
Abstract
Cancer is a multifactorial disease that involves many molecular alterations. Gastric cancer (GC) is the third leading cause of cancer death worldwide. GC is a highly heterogeneous disease with different molecular and genetics features. Therefore, this review focuses on an overview of the genetic aspects of gastric cancer by highlighting the important impact and role of deletions and/or duplications of chromosomal segments, genomic variants, H. pylori infection and interleukin variants, as found in gene expression and newly proposed molecular classification studies. The challenge is to better understand the mechanisms and different pathways that lead to the development and progression of GC.
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Affiliation(s)
- Carolina Oliveira Gigek
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), CEP 04023-900 São Paulo, Brazil; Disciplina de Gastroenterologia Cirúrgica, Universidade Federal de São Paulo (UNIFESP), CEP: 04024-002 São Paulo, Brazil.
| | - Danielle Queiroz Calcagno
- Núcleo de Pesquisas em Oncologia, Universidade Federal do Pará (UFPA), CEP: 66073-000 Belém, Pará, Brazil
| | | | - Leonardo Caires Santos
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), CEP 04023-900 São Paulo, Brazil
| | - Mariana Ferreira Leal
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), CEP 04023-900 São Paulo, Brazil; Departamento de Ortopedia e Traumatologia, Universidade Federal de São Paulo (UNIFESP), CEP 04038-032 São Paulo, Brazil
| | - Fernanda Wisnieski
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), CEP 04023-900 São Paulo, Brazil
| | | | - Laercio Gomes Lourenço
- Disciplina de Gastroenterologia Cirúrgica, Universidade Federal de São Paulo (UNIFESP), CEP: 04024-002 São Paulo, Brazil
| | - Gaspar Jesus Lopes-Filho
- Disciplina de Gastroenterologia Cirúrgica, Universidade Federal de São Paulo (UNIFESP), CEP: 04024-002 São Paulo, Brazil
| | - Marilia Arruda Cardoso Smith
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), CEP 04023-900 São Paulo, Brazil
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Gigek CO, Chen ES, Smith MAC. Methyl-CpG-Binding Protein (MBD) Family: Epigenomic Read-Outs Functions and Roles in Tumorigenesis and Psychiatric Diseases. J Cell Biochem 2016. [PMID: 26205787 DOI: 10.1002/jcb.25281] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Epigenetics is the study of the heritable changes on gene expression that are responsible for the regulation of development and that have an impact on several diseases. However, it is of equal importance to understand how epigenetic machinery works. DNA methylation is the most studied epigenetic mark and is generally associated with the regulation of gene expression through the repression of promoter activity and by affecting genome stability. Therefore, the ability of the cell to interpret correct methylation marks and/or the correct interpretation of methylation plays a role in many diseases. The major family of proteins that bind methylated DNA is the methyl-CpG binding domain proteins, or the MBDs. Here, we discuss the structure that makes these proteins a family, the main functions and interactions of all protein family members and their role in human disease such as psychiatric disorders and cancer.
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Affiliation(s)
- Carolina Oliveira Gigek
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitão da Cunha, 1, ° andar, CEP 04023-900, São Paulo, SP, Brazil.,Disciplina de Gastroenterologia Cirúrgica, Departamento de Cirurgia, Universidade Federal de São Paulo (UNIFESP), R. Napoleão de Barros, 715, 2º andar, CEP:04024-002, São Paulo, Brazil
| | - Elizabeth Suchi Chen
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitão da Cunha, 1, ° andar, CEP 04023-900, São Paulo, SP, Brazil
| | - Marilia Arruda Cardoso Smith
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitão da Cunha, 1, ° andar, CEP 04023-900, São Paulo, SP, Brazil
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Oliveira FF, Cardoso AF, Mazzotti DR, Faria TC, Souza GS, Teixeira DV, Chen ES, Arruda Cardoso Smith M, Ferreira Bertolucci PH. P1‐132:
GRIN
1 Genotypes and
APOE
Gene Haplotypes Affect the Age at Onset of Alzheimer's Disease Dementia But Not Cognitive or Functional Response to Memantine. Alzheimers Dement 2016. [DOI: 10.1016/j.jalz.2016.06.880] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Ferreira de Oliveira F, Chen ES, Cardoso Smith MA, Ferreira Bertolucci PH. P3‐292: Effects of Apoe Gene Haplotypes and Measures of Cardiovascular Risk Over Cognitive and Functional Decline in one Year in Patients with Alzheimer's Disease Dementia. Alzheimers Dement 2016. [DOI: 10.1016/j.jalz.2016.06.1956] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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Ferreira de Oliveira F, Ferreira Bertolucci PH, Chen ES, Cardoso Smith MA. P2‐025: PHARMACOGENETICS OF CHOLESTEROL‐LOWERING DRUGS IN PATIENTS WITH DEMENTIA DUE TO ALZHEIMER'S DISEASE. Alzheimers Dement 2014. [DOI: 10.1016/j.jalz.2014.05.698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Ferreira de Oliveira F, Ferreira Bertolucci PH, Chen ES, Cardoso Smith MA. P2‐024: PHARMACOGENETICS OF BRAIN‐PENETRATING ANGIOTENSIN‐CONVERTING ENZYME INHIBITORS IN DEMENTIA DUE TO ALZHEIMER'S DISEASE. Alzheimers Dement 2014. [DOI: 10.1016/j.jalz.2014.05.697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
Cancer is considered one of the major health issues worldwide, and gastric cancer accounted for 8% of total cases and 10% of total deaths in 2008. Gastric cancer is considered an age-related disease, and the total number of newly diagnosed cases has been increasing as a result of the higher life expectancy. Therefore, the basic mechanisms underlying gastric tumorigenesis is worth investigation. This review provides an overview of the epigenetic mechanisms, such as DNA methylation, histone modifications, chromatin remodeling complex and miRNA, involved in gastric cancer. As the studies in gastric cancer continue, the mapping of an epigenome code is not far for this disease. In conclusion, an epigenetic therapy might appear in the not too distant future.
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Affiliation(s)
- Carolina Oliveira Gigek
- Disciplina de Genética, Departamento de Morfologia e Genética, Escola Paulista de Medicina/Universidade Federal de São Paulo, Rua Botucatu 740, São Paulo, SP, Brazil.
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17
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Furuya TK, Silva PNO, Payão SLM, Bertolucci PHF, Rasmussen LT, De Labio RW, Braga ILS, Chen ES, Turecki G, Mechawar N, Mill J, Smith MAC. Analysis of SNAP25 mRNA expression and promoter DNA methylation in brain areas of Alzheimer's Disease patients. Neuroscience 2012; 220:41-6. [PMID: 22732502 DOI: 10.1016/j.neuroscience.2012.06.035] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Revised: 06/13/2012] [Accepted: 06/14/2012] [Indexed: 10/28/2022]
Abstract
Alzheimer's Disease (AD) is the most common cause of dementia in elderly people. The presynaptic terminal is an important site of pathological changes in AD, leading to synaptic loss in specific brain regions, such as in the cortex and hippocampus. In this study, we investigated synaptosomal-associated protein, 25-kDa (SNAP25) mRNA levels and promoter DNA methylation in post mortem brain tissues (entorhinal and auditory cortices and hippocampus) from healthy elderly and AD subjects as well as in peripheral blood leukocytes of young, healthy elderly and AD patients. mRNA quantification was performed by quantitative Reverse Transcription Polymerase Chain Reaction (qRT-PCR) using the ΔΔC(T) method and promoter DNA methylation was quantified by mass spectrometry using the Sequenom EpiTYPER platform. We observed a significant decrease in SNAP25 expression in AD across all the three brain regions in relation to the healthy elderly subjects, suggesting impairment in synaptic function. The changes in the auditory cortex reflected those observed in the hippocampus and entorhinal cortex, the primary areas affected in AD. However, no AD-associated differences in SNAP25 promoter DNA methylation were observed suggesting that other mechanisms may be involved in mediating the observed gene expression changes.
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Affiliation(s)
- T K Furuya
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo (UNIFESP), São Paulo-SP, Brazil
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18
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Rasmussen LT, Labio RWD, C Neto A, Silva LC, Queiroz VF, Smith MAC, Payão SLM. Detection of Helicobacter pylori in gastric biopsies, saliva and dental plaques of dyspeptic patients from Marília, São Paulo, Brazil: presence of vacA and cagA genes. J Venom Anim Toxins Incl Trop Dis 2012. [DOI: 10.1590/s1678-91992012000200008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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Lima EM, Leal MF, Burbano RR, Khayat AS, Assumpção PP, Bello MJ, Rey JA, Smith MAC, Casartelli C. Methylation status of ANAPC1, CDKN2A and TP53 promoter genes in individuals with gastric cancer. Braz J Med Biol Res 2009; 41:539-43. [PMID: 18622497 DOI: 10.1590/s0100-879x2008000600017] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2007] [Accepted: 05/08/2008] [Indexed: 11/21/2022] Open
Abstract
Gastric cancer is the forth most frequent malignancy and the second most common cause of cancer death worldwide. DNA methylation is the most studied epigenetic alteration, occurring through a methyl radical addition to the cytosine base adjacent to guanine. Many tumor genes are inactivated by DNA methylation in gastric cancer. We evaluated the DNA methylation status of ANAPC1, CDKN2A and TP53 by methylation-specific PCR in 20 diffuse- and 26 intestinal-type gastric cancer samples and 20 normal gastric mucosa in individuals from Northern Brazil. All gastric cancer samples were advanced stage adenocarcinomas. Gastric samples were surgically obtained at the João de Barros Barreto University Hospital, State of Pará, and were stored at -80 degrees C before DNA extraction. Patients had never been submitted to chemotherapy or radiotherapy, nor did they have any other diagnosed cancer. None of the gastric cancer samples presented methylated DNA sequences for ANAPC1 and TP53. CDKN2A methylation was not detected in any normal gastric mucosa; however, the CDKN2A promoter was methylated in 30.4% of gastric cancer samples, with 35% methylation in diffuse-type and 26.9% in intestinal-type cancers. CDKN2A methylation was associated with the carcinogenesis process for ~30% diffuse-type and intestinal-type compared to non-neoplastic samples. Thus, ANAPC1 and TP53 methylation was probably not implicated in gastric carcinogenesis in our samples. CDKN2A can be implicated in the carcinogenesis process of only a subset of gastric neoplasias.
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Affiliation(s)
- E M Lima
- Colegiado de Biomedicina, Universidade Federal do Piauí, Parnaíba, PI, Brasil
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20
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Smith MAC, Silva MDA, Cendoroglo MS, Ramos LR, Araujo LMQ, Labio RW, Burbano RR, Chen ES, Payão SLM. TP53 codon 72 polymorphism as a risk factor for cardiovascular disease in a Brazilian population. ACTA ACUST UNITED AC 2008; 40:1465-72. [PMID: 17934643 DOI: 10.1590/s0100-879x2007001100007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2007] [Accepted: 07/31/2007] [Indexed: 11/21/2022]
Abstract
TP53, a tumor suppressor gene, has a critical role in cell cycle, apoptosis and cell senescence and participates in many crucial physiological and pathological processes. Identification of TP53 polymorphism in older people and age-related diseases may provide an understanding of its physiology and pathophysiological role as well as risk factors for complex diseases. TP53 codon 72 (TP53:72) polymorphism was investigated in 383 individuals aged 66 to 97 years in a cohort from a Brazilian Elderly Longitudinal Study. We investigated allele frequency, genotype distribution and allele association with morbidities such as cardiovascular disease, type II diabetes, obesity, neoplasia, low cognitive level (dementia), and depression. We also determined the association of this polymorphism with serum lipid fractions and urea, creatinine, albumin, fasting glucose, and glycated hemoglobin levels. DNA was isolated from blood cells, amplified by PCR using sense 5'-TTGCCGTCCCAAGCAATGGATGA-3' and antisense 5'-TCTGGGAAGGGACAGAAGATGAC-3' primers and digested with the BstUI enzyme. This polymorphism is within exon 4 at nucleotide residue 347. Descriptive statistics, logistic regression analysis and Student t-test using the multiple comparison test were used. Allele frequencies, R (Arg) = 0.69 and P (Pro) = 0.31, were similar to other populations. Genotype distributions were within Hardy-Weinberg equilibrium. This polymorphism did not show significant association with any age-related disease or serum variables. However, R allele carriers showed lower HDL levels and a higher frequency of cardiovascular disease than P allele subjects. These findings may help to elucidate the physiopathological role of TP53:72 polymorphism in Brazilian elderly people.
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Affiliation(s)
- M A C Smith
- Disciplina de Genética, Departamento de Morfologia e Genética, Escola Paulista de Medicina, Universidade Federal de São PauloSão Paulo, SP, Brasil.
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21
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Khayat AS, Antunes LM, Guimarães AC, Bahia MO, Lemos JAR, Cabral IR, Lima PDL, Amorim MIM, Cardoso PCS, Smith MAC, Santos RA, Burbano RR. Cytotoxic and genotoxic monitoring of sickle cell anaemia patients treated with hydroxyurea. Clin Exp Med 2008; 6:33-7. [PMID: 16550342 DOI: 10.1007/s10238-006-0091-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [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: 06/24/2005] [Accepted: 02/04/2006] [Indexed: 10/24/2022]
Abstract
Very satisfactory results have been obtained with the treatment of sickle cell anaemia with hydroxyurea (HU), an antineoplastic drug. This is because it significantly increases the levels of foetal haemoglobin. Nevertheless, inadequate dosages or prolonged treatment with this pharmaceutical can provoke cytotoxicity or genotoxicity, increasing the risk of neoplasia. We monitored patients under treatment with HU for possible mutagenic effects, through cytogenetic tests (mitotic index and chromosome aberrations) for one year. Checking at two-month intervals, the cytotoxic effect was not evident. There was no evidence of genotoxicity under the conditions of our experiment. However individuals treated with HU should be constantly monitored, as an absence of genotoxicity could be transitory; the mitotic index should also be observed, as an indicator of cytotoxicity.
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Affiliation(s)
- A S Khayat
- Centro de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brazil
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22
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Smith MAC, Silva MDA, Araujo LQ, Ramos LR, Labio RW, Burbano RR, Peres CA, Andreoli SB, Payão SLM, Cendoroglo MS. Frequency of Werner helicase 1367 polymorphism and age-related morbidity in an elderly Brazilian population. Braz J Med Biol Res 2005; 38:1053-9. [PMID: 16007276 DOI: 10.1590/s0100-879x2005000700008] [Citation(s) in RCA: 11] [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: 11/22/2022] Open
Abstract
Werner syndrome (WS) is a premature aging disease caused by a mutation in the WRN gene. The gene was identified in 1996 and its product acts as a DNA helicase and exonuclease. Some specific WRN polymorphic variants were associated with increased risk for cardiovascular diseases. The identification of genetic polymorphisms as risk factors for complex diseases affecting older people can improve their prevention, diagnosis and prognosis. We investigated WRN codon 1367 polymorphism in 383 residents in a district of the city of São Paulo, who were enrolled in an Elderly Brazilian Longitudinal Study. Their mean age was 79.70 +/- 5.32 years, ranging from 67 to 97. This population was composed of 262 females (68.4%) and 121 males (31.6%) of European (89.2%), Japanese (3.3%), Middle Eastern (1.81%), and mixed and/or other origins (5.7%). There are no studies concerning this polymorphism in Brazilian population. These subjects were evaluated clinically every two years. The major health problems and morbidities affecting this cohort were cardiovascular diseases (21.7%), hypertension (83.7%), diabetes (63.3%), obesity (41.23%), dementia (8.0%), depression (20.0%), and neoplasia (10.8%). Their prevalence is similar to some urban elderly Brazilian samples. DNA was isolated from blood cells, amplified by PCR and digested with PmaCI. Allele frequencies were 0.788 for the cysteine and 0.211 for the arginine. Genotype distributions were within that expected for the Hardy-Weinberg equilibrium. Female gender was associated with hypertension and obesity. Logistic regression analysis did not detect significant association between the polymorphism and morbidity. These findings confirm those from Europeans and differ from Japanese population.
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Affiliation(s)
- M A C Smith
- Departamento de Morfologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, SP, Brasil.
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23
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Silva-Pereira LC, Cardoso PCS, Leite DS, Bahia MO, Bastos WR, Smith MAC, Burbano RR. Cytotoxicity and genotoxicity of low doses of mercury chloride and methylmercury chloride on human lymphocytes in vitro. Braz J Med Biol Res 2005; 38:901-7. [PMID: 15933784 DOI: 10.1590/s0100-879x2005000600012] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [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: 11/22/2022] Open
Abstract
Mercury is a xenobiotic metal that is a highly deleterious environmental pollutant. The biotransformation of mercury chloride (HgCl2) into methylmercury chloride (CH3HgCl) in aquatic environments is well-known and humans are exposed by consumption of contaminated fish, shellfish and algae. The objective of the present study was to determine the changes induced in vitro by two mercury compounds (HgCl2 and CH3HgCl) in cultured human lymphocytes. Short-term human leukocyte cultures from 10 healthy donors (5 females and 5 males) were set-up by adding drops of whole blood in complete medium. Cultures were separately and simultaneously treated with low doses (0.1 to 1000 microg/l) of HgCl2 and CH3HgCl and incubated at 37 degrees C for 48 h. Genotoxicity was assessed by chromosome aberrations and polyploid cells. Mitotic index was used as a measure of cytotoxicity. A significant increase (P < 0.05) in the relative frequency of chromosome aberrations was observed for all concentrations of CH3HgCl when compared to control, whether alone or in an evident sinergistic combination with HgCl2. The frequency of polyploid cells was also significantly increased (P < 0.05) when compared to control after exposure to all concentrations of CH3HgCl alone or in combination with HgCl2. CH3HgCl significantly decreased (P < 0.05) the mitotic index at 100 and 1000 microg/l alone, and at 1, 10, 100, and 1000 microg/l when combined with HgCl2, showing a synergistic cytotoxic effect. Our data showed that low concentrations of CH3HgCl might be cytotoxic/genotoxic. Such effects may indicate early cellular changes with possible biological consequences and should be considered in the preliminary evaluation of the risks of populations exposed in vivo to low doses of mercury.
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Affiliation(s)
- L C Silva-Pereira
- Departamento de Pós-Graduação, Faculdade de Itaituba, Itaituba, PA, Brasil
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Lima EM, Rissino JD, Harada ML, Assumpção PP, Demachki S, Guimarães AC, Casartelli C, Smith MAC, Burbano RR. Conventional cytogenetic characterization of a new cell line, ACP01, established from a primary human gastric tumor. Braz J Med Biol Res 2004; 37:1831-8. [PMID: 15558189 DOI: 10.1590/s0100-879x2004001200008] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [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: 12/14/2022] Open
Abstract
Gastric cancer is the second most frequent type of neoplasia and also the second most important cause of death in the world. Virtually all the established cell lines of gastric neoplasia were developed in Asian countries, and western countries have contributed very little to this area. In the present study we describe the establishment of the cell line ACP01 and characterize it cytogenetically by means of in vitro immortalization. Cells were transformed from an intestinal-type gastric adenocarcinoma (T4N2M0) originating from a 48-year-old male patient. This is the first gastric adenocarcinoma cell line established in Brazil. The most powerful application of the cell line ACP01 is in the assessment of cytotoxicity. Solid tumor cell lines from different origins have been treated with several conventional and investigational anticancer drugs. The ACP01 cell line is triploid, grows as a single, non-organized layer, similar to fibroblasts, with focus formation, heterogeneous division, and a cell cycle of approximately 40 h. Chromosome 8 trisomy, present in 60% of the cells, was the most frequent cytogenetic alteration. These data lead us to propose a multifactorial triggering of gastric cancer which evolves over multiple stages involving progressive genetic changes and clonal expansion.
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Affiliation(s)
- E M Lima
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil
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