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Ancient DNA analysis from epoxy resin Biodur ®-embedded bones. Biotechniques 2022; 73:113-122. [PMID: 36066013 DOI: 10.2144/btn-2022-0056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
For microscopic investigation, archaeological bone samples are often embedded in Biodur® epoxy resin. This study wants to test whether it is possible to extract DNA suitable for PCR amplification from this sample type. For eight individuals a set of samples - each consisting of a Biodur-embedded femur sample, a native femur sample and a control sample of different anatomical origin - were submitted to organic DNA extraction. The extraction success was tested by autosomal short tandem repeat amplification. Seven out of eight Biodur-embedded femur samples revealed successful amplification results. If Biodur-embedded bone material exists from earlier microscopic investigations, our results encourage the use of this sample type as a source for genetic research.
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Dos Santos MP, Pereira JN, De Labio RW, Carneiro LC, Pontes JC, Barbosa MS, Smith MDAC, Payão SLM, Rasmussen LT. Decrease of miR-125a-5p in Gastritis and Gastric Cancer and Its Possible Association with H. pylori. J Gastrointest Cancer 2021; 52:569-574. [PMID: 32504357 DOI: 10.1007/s12029-020-00432-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE The aim of this study was to evaluate the expression of miR-125a-5p in patients with dyspeptic symptoms and gastric cancer, correlating them with the development of this cancer and H. pylori. METHODS Patients were divided in groups according to histopathological analysis (control, gastritis, and cancer groups). Polymerase chain reaction was performed to detect H. pylori and real-time quantitative PCR to determine miR-125a-5p expression. RESULTS H. pylori was detected in 44% of the patients, with prevalence in the gastritis and cancer groups. A statistically significant decrease of miR-125a-5p expression was found in the control positive (p = 0.0183*), gastritis positive (p = 0.0380*), and cancer positive (p = 0.0288*) groups when compared with the control negative group. CONCLUSION We suggest that decreased expression of the miRNA-125a-5p associated with the presence of the H. pylori is an important mechanism in gastric diseases and could be a possible marker for early diagnosis of gastric cancer.
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Affiliation(s)
- Mônica Pezenatto Dos Santos
- Genetics Laboratory, Marília Medical School (FAMEMA), Lourival Freire, 240, Bairro Fragata, Marília, São Paulo, CEP 17519-050, Brazil
| | - Jéssica Nunes Pereira
- Genetics Laboratory, Marília Medical School (FAMEMA), Lourival Freire, 240, Bairro Fragata, Marília, São Paulo, CEP 17519-050, Brazil
| | - Roger Willian De Labio
- Genetics Laboratory, Marília Medical School (FAMEMA), Lourival Freire, 240, Bairro Fragata, Marília, São Paulo, CEP 17519-050, Brazil
| | - Lilian Carla Carneiro
- Institute of Tropical Pathology and Public Health, Federal University of Goiás (UFG), Goiânia, Goiás, Brazil
| | - Jaqueline Correia Pontes
- Institute of Tropical Pathology and Public Health, Federal University of Goiás (UFG), Goiânia, Goiás, Brazil
| | - Mônica Santiago Barbosa
- Institute of Tropical Pathology and Public Health, Federal University of Goiás (UFG), Goiânia, Goiás, Brazil
| | | | - Spencer Luíz Marques Payão
- Genetics Laboratory, Marília Medical School (FAMEMA), Lourival Freire, 240, Bairro Fragata, Marília, São Paulo, CEP 17519-050, Brazil
| | - Lucas Trevizani Rasmussen
- Biochemistry Department, Marília Medical School (FAMEMA), Lourival Freire, 240, Bairro Fragata, Marília, São Paulo, CEP 17519-050, Brazil.
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Analysis of 8q24.21 miRNA cluster expression and copy number variation in gastric cancer. Future Med Chem 2019; 11:947-958. [PMID: 31141411 DOI: 10.4155/fmc-2018-0477] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Aim: To analyze gene expression and copy number of five miRNAs (miR-1204, miR-1205, miR-1206, miR-1207 and miR-1208) localized in this chromosome region in gastric cancer (GC). Materials & methods: 65 paired neoplastic and non-neoplastic specimens collected from GC patients and 20 non-neoplastic gastric tissues from cancer-free individuals were included in this study. The expression levels of the five miRNAs were accessed by real time qPCR and were correlated. Results: MiR-1207-3p, miR-1205, miR-1207-5p and miR-1208 were upregulated in approximately 50% of GC tumors in relation to those of adjacent non-neoplastic tissues. MiR-1205 expression was associated with gain of gene copies and was upregulated in adjacent non-neoplastic samples relative to external controls. Conclusion: The coexpression of the 8q24 miRNAs indicated the role of miR-1205 in the initiation of gastric cancer development.
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Dos Santos MP, Sallas ML, Zapparoli D, Orcini WA, Chen E, Smith MDAC, Payão SLM, Rasmussen LT. Lack of Association between IL-6 Polymorphisms and Haplotypes with Gastric Cancer. J Cell Biochem 2018; 120:9448-9454. [PMID: 30525242 DOI: 10.1002/jcb.28220] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 11/15/2018] [Indexed: 12/24/2022]
Abstract
The process of combating neoplasms and mononuclear cells, and during H. pylori infection, several pro-inflammatory and anti-inflammatory cytokines are synthesized. In view of the involvement of the IL-6 law and the presence of H. pylori in the development of gastric diseases, the present study aimed to characterize the promoter-region polymorphism -597 (G/A) (rs1800797), -572 (C/G) (rs1800796), and -174 (G/C) (rs1800795) by PCR-RFLP in 375 gastric biopsy specimens from patients with peptic symptoms. A total of 375 samples were analyzed: 87 patients (without lesion without gastric tissue); 236 patients with gastritis and 52 patients with gastric cancer analyzed the PCR-RFLP techniques. All the results were normalized in relation to the presence of H. pylori. The frequencies of the three polymorphisms were compared in the Control vs Gastritis groups and a statistically significant test observed: -174 (G/C) (OR: 1.27; 95% CI: 0.84-1.93; P = 0.26), 572 (C/G) (OR: 1.42; 95% CI: 0.78-2.59; P = 0.25), and 597 (G/A) (OR: 0.98; 95% CI, 0.64-1.52; P = 0.94). Similar results were obtained when the gastric cancer group was compared to the control group: -174 (G/C) (OR: 1.27; 95% CI: 0.66-2.47; P = 0.47), -572 (C/G) (OR: 1.07; 95% CI: 0.43-2.68; P = 0.88), and -597 (G/A) (OR: 1.01; 95% CI, 0.5-0.9; P = 0.99). The haplotypes were and were not observed statistically significant differences. In conclusion, we found no correlations between any of the three polymorphisms in the IL-6 gene analyzed in this study and a higher risk of gastritis or gastric cancer.
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Affiliation(s)
| | | | - Diana Zapparoli
- Universidade do Sagrado Coração (USC), Bauru, São Paulo, Brazil
| | | | - Elizabeth Chen
- Universidade Federal de São Paulo, (UNIFESP), São Paulo, Brazil
| | | | | | - Lucas Trevizani Rasmussen
- Universidade do Sagrado Coração (USC), Bauru, São Paulo, Brazil.,Faculdade de Medicina de Marilia (FAMEMA) - Hemocentro, Marília, São Paulo, Brazil
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Abstract
PURPOSE This study investigated miRNA-181c expression in control patients (healthy gastric mucosa), patients with gastritis, and patients with gastric cancer. The presence of Helicobacter pylori was determined, and the associations between H. pylori infection, levels of miRNA-181c expression, and gastric disease were also analyzed. METHODS A total of 158 subjects were included in the study, and the three groups were respectively composed of 53 controls, 86 patients with gastritis, and 19 patients with gastric cancer. miRNA-181c expression and H. pylori infection were determined by quantitative real-time PCR and PCR, respectively. The subsequent target gene analysis was performed using the bioinformatics approach to understand the possible mechanisms of gastric cancer. RESULTS We determined significantly lower miRNA-181c expression in the gastric cancer group when compared to the control and gastritis groups, regardless of the presence of H. pylori. There was no difference in miRNA-181c expression between the control group and gastritis group, whether the presence of H. pylori was considered or not. The bioinformatics approach identified several genes as possible targets for miRNA-181c, including the X-linked inhibitor of apoptosis (XIAP) gene (which encodes a protein that belongs to a family of apoptotic suppressor proteins), the caspase 9 gene, and the caspase 3 gene. All target genes identified may be involved in gastric cancer and apoptosis pathways. CONCLUSION The results suggest that the presence of H. pylori has no influence on microRNA expression and that the downregulation of miR-181c may play an important role in gastric cancer progression by controlling important genes associated with apoptosis. Therefore, miRNA-181c may be a potential marker of gastric cancer.
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Basílio ILD, Catão MDFC, Carvalho JDDS, Freire-Neto FP, Ferreira LC, Jerônimo SMB. Risk factors of Helicobacter pylori infection in an urban community in Northeast Brazil and the relationship between the infection and gastric diseases. Rev Soc Bras Med Trop 2018; 51:183-189. [DOI: 10.1590/0037-8682-0412-2016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 04/18/2018] [Indexed: 12/20/2022] Open
Affiliation(s)
| | | | | | - Francisco Paulo Freire-Neto
- Universidade Federal do Rio Grande do Norte, Brazil; Universidade Federal do Rio Grande do Norte, Brazil; Instituto Nacional de Ciência e Tecnologia de Doenças Tropicais, Brasil
| | - Leonardo Capristano Ferreira
- Universidade Federal do Rio Grande do Norte, Brazil; Universidade Federal do Rio Grande do Norte, Brazil; Instituto Nacional de Ciência e Tecnologia de Doenças Tropicais, Brasil
| | - Selma Maria Bezerra Jerônimo
- Universidade Federal do Rio Grande do Norte, Brazil; Universidade Federal do Rio Grande do Norte, Brazil; Universidade Federal do Rio Grande do Norte, Brazil; Instituto Nacional de Ciência e Tecnologia de Doenças Tropicais, Brasil
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Zabaglia LM, Sallas ML, Santos MPD, Orcini WA, Peruquetti RL, Constantino DH, Chen E, Smith MDAC, Payão SM, Rasmussen LT. Expression of miRNA‐146a, miRNA‐155, IL‐2, and TNF‐α in inflammatory response to
Helicobacter pylori
infection associated with cancer progression. Ann Hum Genet 2017; 82:135-142. [DOI: 10.1111/ahg.12234] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 10/19/2017] [Accepted: 11/10/2017] [Indexed: 02/06/2023]
Affiliation(s)
| | | | | | | | | | | | - Elizabeth Chen
- Universidade Federal de São Paulo (UNIFESP) São Paulo São Paulo Brazil
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Ferraz MA, Zabaglia LM, Pereira WN, Orcini WA, de Labio RW, Caleman Neto A, Wisnieski F, Calcagno DQ, Santos LC, Assumpção PP, Burbano RR, Artigiani R, Smith MDAC, Payão SLM, Rasmussen LT. Downregulated Expression of E-cadherin and TP53 in Patients with Gastric Diseases: the Involvement of H. pylori Infection and Its Virulence Markers. J Gastrointest Cancer 2016; 47:20-6. [PMID: 26585943 DOI: 10.1007/s12029-015-9782-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
PURPOSE Gastritis caused by infection with Helicobacter pylori is characterized by chronic inflammation and damage in gastric tissue, which is a main risk factor for gastric cancer. Associated with H. pylori, the TP53 gene tumor suppressor and the cell adhesion glycoprotein epithelial cadherin develop a relevant role in the integrity and carcinogenesis of the epithelium. We aimed to detection of H. pylori and its main virulence markers and measured the messenger RNA (mRNA) expression levels of E-cadherin and TP53 genes. METHODS The detection of H. pylori and its virulence markers, as well as the mRNA expression levels of E-cadherin and TP53 genes, were obtained for 161 samples of gastric biopsies including 37 with normal gastric tissue, 70 with gastritis, 24 from neoplastic tissue, and 27 from adjacent non-neoplastic by means of a quantitative real-time polymerase chain reaction. RESULTS The mRNA expression levels of E-cadherin and TP53 were found to be decreased in patients with gastritis, independently of H. pylori infection. In samples from gastric patients, the neoplastic tissue showed an accentuated decrease of expression; on the other hand, the expression of E-cadherin was normal in adjacent non-neoplastic. CONCLUSIONS No evidence was found of the involvement of the cagA and vacA genes in the decreased expression of E-cadherin and TP53. The process of carcinogenesis is complex, and the decrease of the E-cadherin gene expression and TP53 gene expression appears to contribute significantly.
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Affiliation(s)
- Mariane Avante Ferraz
- Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade do Sagrado Coração, Rua Irmã Arminda, 10-50, Bauru, 17011160, Brazil
| | - Luanna Munhoz Zabaglia
- Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade do Sagrado Coração, Rua Irmã Arminda, 10-50, Bauru, 17011160, Brazil
| | - Weendelly Nayara Pereira
- Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade do Sagrado Coração, Rua Irmã Arminda, 10-50, Bauru, 17011160, Brazil
| | - Wilson Aparecido Orcini
- Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade do Sagrado Coração, Rua Irmã Arminda, 10-50, Bauru, 17011160, Brazil
| | - Roger Willian de Labio
- Departamento de Genética e Biologia Molecular, Hemocentro, Faculdade de Medicina de Marília, Rua Monte Carmelo, 800, Marília, 17519050, Brazil
| | - Agostinho Caleman Neto
- Departamento de Genética e Biologia Molecular, Hemocentro, Faculdade de Medicina de Marília, Rua Monte Carmelo, 800, Marília, 17519050, Brazil
| | - Fernanda Wisnieski
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, 04023900, Brazil
| | - Danielle Queiroz Calcagno
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, 04023900, Brazil
| | - Leonardo Caires Santos
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, 04023900, Brazil
| | - Paulo Pimentel Assumpção
- Núcleo de Pesquisa em Oncologia, Hospital João de Barros Barreto, Universidade Federal do Pará, Avenida Mundurucus, 4487, Belém, 66073000, Brazil
| | - Rommel Rodriguez Burbano
- Laboratório de Citogenética Humana, Instituto de Ciências Biológicas, Universidade Federal do Pará, Rua Augusto Correia, 01, Belém, 66075110, Brazil
| | - Ricardo Artigiani
- Departamento de Patologia, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, 04023000, Brazil
| | - Marilia de Arruda Cardoso Smith
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade Federal de São Paulo, Rua Botucatu, 740, São Paulo, 04023900, Brazil
| | - Spencer Luiz Marques Payão
- Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade do Sagrado Coração, Rua Irmã Arminda, 10-50, Bauru, 17011160, Brazil
| | - Lucas T Rasmussen
- Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade do Sagrado Coração, Rua Irmã Arminda, 10-50, Bauru, 17011160, Brazil.
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Rossi AFT, Cadamuro ACT, Biselli-Périco JM, Leite KRM, Severino FE, Reis PP, Cordeiro JA, Silva AE. Interaction between inflammatory mediators and miRNAs in Helicobacter pylori infection. Cell Microbiol 2016; 18:1444-58. [PMID: 26945693 PMCID: PMC5074252 DOI: 10.1111/cmi.12587] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 02/12/2016] [Accepted: 02/29/2016] [Indexed: 12/13/2022]
Abstract
Helicobacter pylori cause chronic inflammation favouring gastric carcinogenesis, and its eradication may prevent malignant transformation. We evaluated whether H. pylori infection and its eradication modify the expression of inflammatory mediators in patients with chronic gastritis. Furthermore, we assessed whether microRNAs modulate inflammatory pathways induced by H. pylori and identified miRNA–gene interaction networks. mRNA and protein expression of TNFA, IL6, IL1B, IL12A, IL2 and TGFBRII and miRNAs miR‐103a‐3p, miR‐181c‐5p, miR‐370‐3p, miR‐375 and miR‐223‐3p were evaluated in tissue samples from 20 patients with chronic gastritis H. pylori negative (Hp−) and 31 H. pylori positive (Hp+), before and three months after bacterium eradication therapy, in comparison with a pool of Hp− normal gastric mucosa. Our results showed that H. pylori infection leads to up‐regulation of TNFA, IL6, IL12A and IL2 and down‐regulation of miRNAs. Bacterium eradication reduces the expression of TNFA and IL6 and up‐regulates TGFBRII and all investigated miRNAs, except miR‐223‐3p. Moreover, transcriptional profiles of inflammatory mediators and miRNAs after eradication are different from the non‐infected group. Deregulated miRNA–mRNA interaction networks were observed in the Hp+ group before and after eradication. Therefore, miRNAs modulated cytokine expression in the presence of H. pylori and after its eradication, suggesting that miRNAs participate in the pathological process triggered by H. pylori in the gastric mucosa.
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Affiliation(s)
- Ana Flávia Teixeira Rossi
- UNESP, São Paulo State University, Department of Biology, Rua Cristóvão Colombo, 2265, São José do Rio Preto, SP, Brazil
| | - Aline Cristina Targa Cadamuro
- UNESP, São Paulo State University, Department of Biology, Rua Cristóvão Colombo, 2265, São José do Rio Preto, SP, Brazil
| | - Joice Matos Biselli-Périco
- UNESP, São Paulo State University, Department of Biology, Rua Cristóvão Colombo, 2265, São José do Rio Preto, SP, Brazil
| | - Kátia Ramos Moreira Leite
- USP, São Paulo University, Faculty of Medicine, Department of Surgery, Avenida Dr. Arnaldo, 455, São Paulo, SP, Brazil
| | - Fábio Eduardo Severino
- UNESP, São Paulo State University, Faculty of Medicine, Department of Surgery and Orthopedics, Avenida Prof. Montenegro, Botucatu, SP, Brazil
| | - Patricia P Reis
- UNESP, São Paulo State University, Faculty of Medicine, Department of Surgery and Orthopedics, Avenida Prof. Montenegro, Botucatu, SP, Brazil
| | - José Antonio Cordeiro
- UNESP, São Paulo State University, Department of Biology, Rua Cristóvão Colombo, 2265, São José do Rio Preto, SP, Brazil
| | - Ana Elizabete Silva
- UNESP, São Paulo State University, Department of Biology, Rua Cristóvão Colombo, 2265, São José do Rio Preto, SP, Brazil.
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Zabaglia LM, Ferraz MA, Pereira WN, Orcini WA, de Labio RW, Neto AC, Wisnieski F, de Oliveira JG, de Arruda Cardoso Smith M, Payão SLM, Rasmussen LT. Lack of association among TNF-α gene expression, -308 polymorphism (G > A) and virulence markers of Helicobacter pylori. J Venom Anim Toxins Incl Trop Dis 2015; 21:54. [PMID: 26719751 PMCID: PMC4696262 DOI: 10.1186/s40409-015-0054-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 12/21/2015] [Indexed: 12/18/2022] Open
Abstract
Background Tumor necrosis factor plays a critical role in the pathogenesis of gastric diseases such as gastric cancer, and an abnormal inflammatory response has frequently been observed in dyspeptic patients. Helicobacter pylori infection can induce a gastric mucosal inflammatory response that may be influenced by -308 (G > A) polymorphisms and gene expression of the TNF-α gene. Methods One hundred and thirty-four gastric biopsy samples were collected from patients of both genders (61♂ and 73♀, mean age 40.3 ± 24.2 years) with gastric symptoms. The -308 (G > A) polymorphism of TNF-α was characterized using polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP). The expression level was measured using real-time PCR, and relative quantification (RQ) was calculated using the comparative CT method (2-ΔΔCT). Results The analysis revealed an increase in TNF-α gene expression in patients with gastritis; on the other hand, no statistical differences were observed in patients with gastric cancer. In addition, no association was found among -308 polymorphism genotypes, virulence markers, or TNF-α gene expression. Conclusions Helicobacter pylori induces a large increase in TNF-α expression in patients with gastritis, regardless of tissue inflammation, but after the tissue becomes neoplastic, the presence of bacteria did not influence expression. These results suggest that the TNF-α pathway may play an important role in the progression from gastritis to gastric cancer
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Affiliation(s)
- Luanna Munhoz Zabaglia
- Universidade Sagrado Coração, Rua Irmã Arminda 10-50, Jardim Brasil, CEP 17011-160 Bauru, SP Brazil
| | - Mariane Avante Ferraz
- Universidade Sagrado Coração, Rua Irmã Arminda 10-50, Jardim Brasil, CEP 17011-160 Bauru, SP Brazil
| | - Weendelly Nayara Pereira
- Universidade Sagrado Coração, Rua Irmã Arminda 10-50, Jardim Brasil, CEP 17011-160 Bauru, SP Brazil
| | - Wilson Aparecido Orcini
- Universidade Sagrado Coração, Rua Irmã Arminda 10-50, Jardim Brasil, CEP 17011-160 Bauru, SP Brazil
| | | | | | - Fernanda Wisnieski
- Universidade Federal de São Paulo, Rua Sena Madureira, 1500, 04021-001 São Paulo, SP Brazil
| | | | | | - Spencer Luiz Marques Payão
- Universidade Sagrado Coração, Rua Irmã Arminda 10-50, Jardim Brasil, CEP 17011-160 Bauru, SP Brazil ; Faculdade de Medicina de Marília, Rua Lourival Freire 240, 17519-050 Marília, SP Brazil
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Caleman Neto A, Rasmussen LT, de Labio RW, de Queiroz VF, Smith MDA, Viani GA, Payão SL. Gene polymorphism of interleukin 1 and 8 in chronic gastritis patients infected with Helicobacter pylori. J Venom Anim Toxins Incl Trop Dis 2014; 20:17. [PMID: 24803922 PMCID: PMC4011515 DOI: 10.1186/1678-9199-20-17] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 04/02/2014] [Indexed: 12/17/2022] Open
Abstract
Background Epidemiological investigations have indicated that Helicobacter pylori induces inflammation in the gastric mucosa regulated by several interleukins. The genes IL1B and IL8 are suggested as key factors in determining the risk of gastritis. The aim of this paper was to evaluate the association of gene polymorphism of interleukin-1 and interleukin-8 with chronic gastrits in H. pylori infected patients. A total of 60 patients underwent endoscopic procedure. Biopsy samples were collected for urease test, histopathological and molecular exams. The DNA of theses samples was extracted for detection of H. pylori and analysis of the genes mentioned above. Patients with gastritis had a higher frequency of H. pylori-positive samples. Results H. pylori was detected in 30/60 patients (50%) by PCR. As for polymorphism of interleukin 8 (-251) gene we observed a statistical difference when analyzed TA (p = 0.039) and TT (p = 0.047) genotypes. In the IL1B31 there was a statistical difference in TT (p = 0.01) genotype and in the IL1B-511 there wasn’t any statistical difference. Conclusion Our results suggest a strong correlation between the presence of chronic gastritis and infection by H. pylori and that IL1B-31TT and IL8-251TT genotypes appear to act as protective factors against H. pylori infection while IL8-251TA genotype may comprise a risk factor for infection with this bacterium.
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Affiliation(s)
- Agostinho Caleman Neto
- Department of Genetics, FAMEMA Blood Center, Marília Medical School (FAMEMA), Marília, São Paulo State, Brazil
| | | | - Roger W de Labio
- Department of Genetics, FAMEMA Blood Center, Marília Medical School (FAMEMA), Marília, São Paulo State, Brazil
| | - Valdeir F de Queiroz
- Department of Digestive System Surgery, Marília Medical School (FAMEMA), Marília, São Paulo State, Brazil
| | - Marília de Ac Smith
- Department of Morphology, Federal University of São Paulo (UNIFESP), São Paulo, São Paulo State, Brazil
| | - Gustavo A Viani
- Department of Radiotherapy and Oncology, Marília Medical School (FAMEMA), Marília, São Paulo State, Brazil
| | - Spencer Lm Payão
- Department of Genetics, FAMEMA Blood Center, Marília Medical School (FAMEMA), Marília, São Paulo State, Brazil ; Sacred Heart University (USC), Bauru, São Paulo State, Brazil ; Laboratório de Genética, Hemocentro, FAMEMA, Rua Lourival Freire, 240, Bairro Fragata, Marília, São Paulo CEP 17519-050, Brazil
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Wisnieski F, Calcagno DQ, Leal MF, Chen ES, Gigek CO, Santos LC, Pontes TB, Rasmussen LT, Payão SLM, Assumpção PP, Lourenço LG, Demachki S, Artigiani R, Burbano RR, Smith MC. Differential expression of histone deacetylase and acetyltransferase genes in gastric cancer and their modulation by trichostatin A. Tumour Biol 2014; 35:6373-81. [PMID: 24668547 DOI: 10.1007/s13277-014-1841-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 03/11/2014] [Indexed: 12/25/2022] Open
Abstract
Gastric cancer is still the second leading cause of cancer-related death worldwide, even though its incidence and mortality have declined over the recent few decades. Epigenetic control using histone deacetylase inhibitors, such as trichostatin A (TSA), is a promising cancer therapy. This study aimed to assess the messenger RNA (mRNA) levels of three histone deacetylases (HDAC1, HDAC2, and HDAC3), two histone acetyltransferases (GCN5 and PCAF), and two possible targets of these histone modifiers (MYC and CDKN1A) in 50 matched pairs of gastric tumors and corresponding adjacent nontumors samples from patients with gastric adenocarcinoma, as well as their correlations and their possible associations with clinicopathological features. Additionally, we evaluated whether these genes are sensitive to TSA in gastric cancer cell lines. Our results demonstrated downregulation of HDAC1, PCAF, and CDKN1A in gastric tumors compared with adjacent nontumors (P < 0.05). On the other hand, upregulation of HDAC2, GCN5, and MYC was observed in gastric tumors compared with adjacent nontumors (P < 0.05). The mRNA level of MYC was correlated to HDAC3 and GCN5 (P < 0.05), whereas CDKN1A was correlated to HDAC1 and GCN5 (P < 0.05 and P < 0.01, respectively). In addition, the reduced expression of PCAF was associated with intestinal-type gastric cancer (P = 0.03) and TNM stages I/II (P = 0.01). The increased expression of GCN5 was associated with advanced stage gastric cancer (P = 0.02) and tumor invasion (P = 0.03). The gastric cell lines treated with TSA showed different patterns of histone deacetylase and acetyltransferase mRNA expression, downregulation of MYC, and upregulation of CDKN1A. Our findings suggest that alteration of histone modifier genes play an important role in gastric carcinogenesis, contributing to MYC and CDKN1A deregulation. In addition, all genes studied here are modulated by TSA, although this modulation appears to be dependent of the genetic background of the cell line.
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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, 04023900, Brazil,
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Pereira WN, Ferraz MA, Zabaglia LM, de Labio RW, Orcini WA, Bianchi Ximenez JP, Neto AC, Payão SLM, Rasmussen LT. Association among H. pylori virulence markers dupA, cagA and vacA in Brazilian patients. J Venom Anim Toxins Incl Trop Dis 2014; 20:1. [PMID: 24456629 PMCID: PMC3922733 DOI: 10.1186/1678-9199-20-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 01/20/2014] [Indexed: 12/14/2022] Open
Abstract
Background Only a few Helicobacter pylori-infected individuals develop severe gastric diseases and virulence factors of H. pylori appear to be involved in such clinical outcomes. Duodenal ulcer promoting gene A (dupA) is a novel virulence factor of Helicobacter pylori that is associated with duodenal ulcer development and reduced risk for gastric carcinoma in some populations. The aims of the present study were to determine the presence of dupA gene and evaluate the association among dupA and other virulence factors including cagA and vacA in Brazilian patients. Gastric biopsies were obtained from 205 dyspeptic patients (100 children and 105 adults). DNA was extracted and analyzed for the presence of H. pylori and its virulence factors using the polymerase chain reaction method. Results Patients with gastritis tested positive for H. pylori more frequently. The dupA gene was detected in 41.5% of them (85/205); cagA gene was found in 98 isolates (47.8%) and vacA genotype s1/m1 in 50.2%, s1/m2 in 8.3%, s2/m2 in 36.6%, s2/m1 in 0.5% and s1/s2/m1/m2 in 4.4%. We also verified a significant association between cagA and dupA genes [p = 0.0003, relative risk (RR) 1.73 and confidence interval [CI] = 1.3–2.3]. The genotypes s1/m1 were also associated with dupA gene (p = 0.0001, RR: 1.72 and CI: 1.3–2.2). The same associations were found when analyzing pediatric and adult groups of patients individually. Conclusion Ours results suggest that dupA is highly frequent in Brazilian patients and is associated with cagA gene and vacA s1/m1 genotype, and it may be considered an important virulence factor in the development of gastric diseases in adults or children.
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Real-time PCR improves Helicobacter pylori detection in patients with peptic ulcer bleeding. PLoS One 2011; 6:e20009. [PMID: 21625499 PMCID: PMC3098855 DOI: 10.1371/journal.pone.0020009] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Accepted: 04/19/2011] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND AND AIMS Histological and rapid urease tests to detect H. pylori in biopsy specimens obtained during peptic ulcer bleeding episodes (PUB) often produce false-negative results. We aimed to examine whether immunohistochemistry and real-time PCR can improve the sensitivity of these biopsies. PATIENTS AND METHODS We selected 52 histology-negative formalin-fixed paraffin-embedded biopsy specimens obtained during PUB episodes. Additional tests showed 10 were true negatives and 42 were false negatives. We also selected 17 histology-positive biopsy specimens obtained during PUB to use as controls. We performed immunohistochemistry staining and real-time PCR for 16S rRNA, ureA, and 23S rRNA for H. pylori genes on all specimens. RESULTS All controls were positive for H. pylori on all PCR assays and immunohistochemical staining. Regarding the 52 initially negative biopsies, all PCR tests were significantly more sensitive than immunohistochemical staining (p<0.01). Sensitivity and specificity were 55% and 80% for 16S rRNA PCR, 43% and 90% for ureA PCR, 41% and 80% for 23S rRNA PCR, and 7% and 100% for immunohistochemical staining, respectively. Combined analysis of PCR assays for two genes were significantly more sensitive than ureA or 23S rRNA PCR tests alone (p<0.05) and marginally better than 16S rRNA PCR alone. The best combination was 16S rRNA+ureA, with a sensitivity of 64% and a specificity of 80%. CONCLUSIONS Real-time PCR improves the detection of H. pylori infection in histology-negative formalin-fixed paraffin-embedded biopsy samples obtained during PUB episodes. The low reported prevalence of H. pylori in PUB may be due to the failure of conventional tests to detect infection.
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Chiurillo MA, Moran YH, Cañas M, Valderrama EJ, Armanie E. Infection with specific Helicobacter pylori-cag pathogenicity island strains is associated with interleukin-1B gene polymorphisms in Venezuelan chronic gastritis patients. Dig Dis Sci 2011; 56:449-56. [PMID: 20585978 DOI: 10.1007/s10620-010-1316-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2010] [Accepted: 06/14/2010] [Indexed: 12/17/2022]
Abstract
BACKGROUND The cag pathogenicity island (cag-PAI) is one of the major virulence factors of Helicobacter pylori, showing considerable geographic variation. AIM We investigated the prevalence of cagA, cagE, and cagT genes of cag-PAI and their association with proinflammatory IL-1B-511/-31/+3954 polymorphisms in Venezuelan chronic gastritis patients from a high-risk gastric cancer region. METHODS Presence of cag-PAI genes and IL-1B polymorphisms in 121 biopsy specimens was evaluated by polymerase chain reaction (PCR) and PCR-restriction fragment length polymorphism (RFLP), respectively. RESULTS cagA (+) and triple-positive (cagAET (+)) strains were detected in 79.3% and 70.2% of patients, respectively. We found that infection with cagA (+) and cagAET (+) strains was associated (P < 0.05) with hosts harboring both IL-1B +3954C allele and IL-1B-511T/-31C/+3954C haplotype (TCC (+)). The frequency of gastric atrophy was significantly higher (P < 0.020) among cagAET (+)/IL-1B-TCC (+) combined genotype carriers. CONCLUSION Carriage of IL-1B +3954C allele and IL-1B-TCC (+) haplotype could favor colonization of bacterial cagAET (+) strains, and the combination of these bacterial and host haplotypes could play a synergistic role in development of premalignant gastric lesions. This work contributes to understanding of the complex interaction between H. pylori virulence factors and cytokine genotypes involved in gastrointestinal diseases.
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Affiliation(s)
- Miguel Angel Chiurillo
- Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto, Venezuela.
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Rasmussen LT, Labio RWD, Gatti LL, Silva LCD, Queiroz VFD, Smith MDAC, Payão SLM. Helicobacter pylori detection in gastric biopsies, saliva and dental plaque of Brazilian dyspeptic patients. Mem Inst Oswaldo Cruz 2010; 105:326-30. [DOI: 10.1590/s0074-02762010000300015] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2009] [Accepted: 03/24/2010] [Indexed: 02/06/2023] Open
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Chiurillo MA, Moran Y, Cañas M, Valderrama E, Alvarez A, Armanie E. Combination of Helicobacter pylori-iceA2 and proinflammatory interleukin-1 polymorphisms is associated with the severity of histological changes in Venezuelan chronic gastritis patients. ACTA ACUST UNITED AC 2010; 59:170-6. [PMID: 20482626 DOI: 10.1111/j.1574-695x.2010.00675.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Helicobacter pylori is a major cause of chronic gastritis (CG) and a firmly established carcinogen for gastric adenocarcinoma. However, the underlying pathogenic mechanisms are not fully understood. In this work we studied the association of the allelic variation of H. pylori-iceA virulence factor and human proinflammatory interleukin (IL)-1 polymorphisms (IL-1B-31, IL-1B-511, IL-1B+3954 and IL-1RN) with histopathological changes in the gastric mucosa of patients with CG in Venezuela, a country with a high incidence of and mortality from gastric cancer. Although in this work the iceA1 allele was found more frequently (69.7%), iceA2 allele prevalence was higher in samples with atrophic gastritis (AG) and more severe grades of granulocytic (G2/G3) [P=0.02; odds ratio (OR) 3.3] and lymphocytic infiltration (L2/L3). The carriage of iceA2 strains combined with proinflammatory IL-1 polymorphisms IL-1-31C or IL-1-511T allele carrier genotypes increased even more the risk of presenting G2/G3 with ORs of 5.1 and 5.4, respectively. Moreover, the iceA2/IL-1B-511T and iceA2/IL-1B-31C/-511T/IL-1RN(*)2 bacteria/host genotype combinations showed a significant association with AG and L2/L3, respectively. Despite not being well established, the bacterial risk factor iceA2 seems an important predictor of severe histological changes in CG, separately or in combination with host genetic factors in the Venezuelan population.
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Prevalence and clinical relevance of cagA, vacA, and iceA genotypes of Helicobacter pylori isolated from Slovenian children. J Pediatr Gastroenterol Nutr 2009; 49:289-96. [PMID: 19525870 DOI: 10.1097/mpg.0b013e31818f09f2] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Although infection with Helicobacter pylori in children mostly induces asymptomatic chronic gastritis, the clinical outcome of H pylori infection is generally unpredictable. To identify the risk subgroup of infected children who can progress toward serious gastrointestinal disease, we assessed the prevalence of H pylori virulence genes cagA, vacA, and iceA in children from southeastern Europe and correlated their presence with the severity of histological changes in the stomach. MATERIALS AND METHODS A total of 165 children (age range 4-18 years, mean 13 years) with H pylori infection were studied for a 6-year period. Virulence genes were determined by polymerase chain reaction from biopsy samples. RESULTS The cagA gene was present in 61.2% of patients. The predominant vacA genotype was s1m1 (42%), followed by s1m2 (28%), and s2m2 (24%). IceA genotypes iceA1 and iceA2 were detected in 62% and 31% of the samples, respectively. Multiple genotypes were found in 11.5% of isolates. The H pylori density score, the degree of chronic and acute inflammation, correlated with a cagA-positive status (P < 0.01, P < 0.01, P = 0.01, respectively). Higher bacterial infiltration (P < 0.01) and degree of chronic inflammation (P = 0.03) were detected in vacA s1-positive samples. CONCLUSION CagA, vacA s1m1, and iceA1 genotypes are the predominant genotypes of H pylori isolated from the southeastern European pediatric population. CagA and vacA s1 are important virulence determinants of H pylori in children, but were not found associated with an increased incidence of precancerous gastric lesions.
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Sicinschi LA, Correa P, Peek RM, Camargo MC, Delgado A, Piazuelo MB, Romero-Gallo J, Bravo LE, Schneider BG. Helicobacter pylori genotyping and sequencing using paraffin-embedded biopsies from residents of colombian areas with contrasting gastric cancer risks. Helicobacter 2008; 13:135-45. [PMID: 18321303 PMCID: PMC2977907 DOI: 10.1111/j.1523-5378.2008.00554.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND cagA-positive and vacA s1 and m1 genotypes of Helicobacter pylori are associated with an elevated risk of gastric cancer (GC). We determined these genotypes using paraffin-embedded gastric biopsy specimens harvested from infected individuals and compared genotype distributions in two Colombian populations residing in geographic regions with a high and low incidence of GC. METHODS DNA from paraffin-embedded gastric biopsies from 107 adults was amplified using primers specific for cagA, for the cag'empty site', for the s and m alleles of vacA, and for H. pylori 16S rRNA. RESULTS H. pylori infection was detected by molecular assays in 97 (90.7%) biopsies. Complete genotyping of cagA and vacA was achieved in 94 (96.9%) cases. The presence of cagA was detected in 78 of 97 cases (80.4%); when considered separately, cagA and vacA s regions were not significantly associated with a particular geographic area. The vacA m1 allele and s1m1 genotypes were more common in the area of high risk for GC (p = .037 and p = .044, respectively), while the vacA m2 allele and s2m2 genotypes were more prevalent in the low-risk area. The prevalence of the combination of cagA-positive, vacA s1m1 genotypes was 84.3% and 60.5% for high and low risk areas, respectively (p = .011). CONCLUSIONS H. pylori cagA and vacA genotyping from paraffin-embedded gastric biopsies permitted reliable typability and discrimination. The more virulent cagA-positive s1m1 strains, as well as vacA m1 genotype, were more prevalent in high risk than in low risk areas, which may contribute to the difference in GC risk between those two regions.
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Affiliation(s)
- Liviu A. Sicinschi
- Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Pelayo Correa
- Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Richard M. Peek
- Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - M. Constanza Camargo
- Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Alberto Delgado
- Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - M. Blanca Piazuelo
- Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Judith Romero-Gallo
- Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Luis E. Bravo
- Department of Pathology, School of Medicine, Universidad del Valle, Cali, Colombia
| | - Barbara G. Schneider
- Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
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Mégraud F, Lehours P. Helicobacter pylori detection and antimicrobial susceptibility testing. Clin Microbiol Rev 2007; 20:280-322. [PMID: 17428887 PMCID: PMC1865594 DOI: 10.1128/cmr.00033-06] [Citation(s) in RCA: 463] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The discovery of Helicobacter pylori in 1982 was the starting point of a revolution concerning the concepts and management of gastroduodenal diseases. It is now well accepted that the most common stomach disease, peptic ulcer disease, is an infectious disease, and all consensus conferences agree that the causative agent, H. pylori, must be treated with antibiotics. Furthermore, the concept emerged that this bacterium could be the trigger of various malignant diseases of the stomach, and it is now a model for chronic bacterial infections causing cancer. Most of the many different techniques involved in diagnosis of H. pylori infection are performed in clinical microbiology laboratories. The aim of this article is to review the current status of these methods and their application, highlighting the important progress which has been made in the past decade. Both invasive and noninvasive techniques will be reviewed.
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Affiliation(s)
- Francis Mégraud
- INSERM U853, and Université Victor Segalen Bordeaux 2, and Laboratoire de Bactériologie, Hôpital Pellegrin, Place Amélie Raba-Léon, 33076 Bordeaux cedex, France.
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Gatti LL, Fagundes e Souza EK, Leite KR, Bastos ELDS, Vicentini LR, Silva LCD, Smith MDAC, Payão SLM. cagA vacA alelles and babA2 genotypes of Helicobacter pylori associated with gastric disease in Brazilian adult patients. Diagn Microbiol Infect Dis 2005; 51:231-5. [PMID: 15808313 DOI: 10.1016/j.diagmicrobio.2004.11.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2004] [Accepted: 11/05/2004] [Indexed: 12/21/2022]
Abstract
Helicobacter pylori is an important human pathogen that causes chronic gastritis and is associated with development of peptic ulcer disease and gastric malignancies. The vacuolating cytotoxin (vacA), cagA gene, and babA2 gene are important virulence factor involving gastric diseases. Eighty-nine Helicobacter pylori-positive gastric biopsies were analyzed by polymerase chain reaction and Southern blotting for H. pylori detection and genotyping with primer pairs from each virulence gene. Fifty-three strains (59%) were common vacA genotype s1/m1, and only 14 (16%) were s2/m2, 12% of strains was found to have multiple infection. The cagA presence was detected in 48% (43 strains) and babA2 gene was detected in 44% of our H. pylori strains. We observed high percentage of s1/m1 strains with chronic gastritis and peptic ulcer and a significant correlation between cagA presence with the s1 allele and babA2 gene with chronic gastritis.
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Affiliation(s)
- Luciano Lobo Gatti
- Faculdade de Medicina de Marília (FAMEMA), Marília, São Paulo 17519-050, Brazil.
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Leite KRM, Darini E, Canavez FC, Carvalho CMD, Mitteldorf CATDS, Camara-Lopes LH. Helicobacter pylori and cagA gene detected by polymerase chain reaction in gastric biopsies: correlation with histological findings, proliferation and apoptosis. SAO PAULO MED J 2005; 123:113-8. [PMID: 16021273 DOI: 10.1590/s1516-31802005000300005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
CONTEXT AND OBJECTIVE The virulence of Helicobacter pylori (HP) in gastroduodenal disease is related to pathogenicity islands (cagPAI) present in some strains. Infection with cagPAI induces IL-8 secretion, increases epithelial cell proliferation and may be important in carcinogenesis. Our objective was to detect HP and the cagA gene (cagPAI marker) by polymerase chain reaction (PCR) and to correlate these results to histological findings, epithelial cell proliferation and apoptosis. DESIGN AND SETTING Retrospective, at the Surgical and Molecular Pathology Laboratory, Hospital Sírio-Libanês. METHODS DNA samples isolated from 164 gastric biopsies were used for HP detection by PCR. cagPAI+ was identified in HP+ cases by cagA gene amplification. All cases were submitted to immunohistochemistry to evaluate cell proliferation, and TUNEL to detect apoptosis. Statistical analysis was performed to compare results. RESULTS HP was detected in 67.7% of the patients, with good correlation between HP infection and moderate to severe gastritis, gastric ulcer and MALT lymphoma. There was a correlation between cagPAI+ strains and severe gastric diseases including cancer. The risk of gastric ulcer, adenocarcinoma and MALT lymphoma was 8.8 times higher for cagPAI+ patients. cagPAI+ infection was related to higher proliferation rates. The proliferation/apoptosis index was significantly higher for cagPAI+ patients. CONCLUSION Cell growth deregulation in cagPAI+ patients could be demonstrated by the difference in the proliferation index. We believe that this explains the carcinogenic role of Helicobacter pylori.
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Sicinschi LA, Correa P, Schneider BG. Comparison of genotyping of Helicobacter pylori cagA and vacA virulence genes from gastric biopsies and stool specimens. Helicobacter 2003; 8:601-7. [PMID: 14632675 DOI: 10.1111/j.1523-5378.2003.00181.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
BACKGROUND We compared results of genotyping of Helicobacter pylori cagA and vacA virulence genes in DNA from gastric biopsies, both paraffin-embedded and frozen, and from stool samples, in order to evaluate the comparative sensitivity of the stool assay. METHODS Genomic DNA from paraffin-embedded biopsies, unfixed frozen biopsies, and stool samples of the same 20 patients was amplified for the cagA gene, an empty site (which provides a positive signal for cagA negative strains) and for the s and m alleles of the vacA gene. Composite genotypes were determined by combining data from analysis of all three materials. RESULTS Analysis of none of the materials taken singly showed all of the genotypes revealed by all three materials taken together, probably because of sampling error. Analysis of paraffin biopsies revealed 83.5%, that of frozen biopsies revealed 74.7% and that of stools revealed 75.9% of the genotypes. There was no significant difference in the percentage of the H. pylori genotypes identified from the three materials. Analysis of combinations of frozen biopsies and stools revealed 89.9% of the composite genotypes, and that of paraffin biopsies and stools revealed 96.2% of the composite genotypes. Evidence of multiple genotypes was found in 10 of 20 (50%) of the cases. CONCLUSIONS Any one of the investigated biological materials can be used for detection of cagA and vacA genes, but no single assay provided a complete genotype. The use of a combination of two materials may generate a more accurate representation of H. pylori genotypes in each individual.
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Affiliation(s)
- Liviu A Sicinschi
- Department of Pathology, Louisiana State University Health Sciences Center and S. Scott Cancer Center, New Orleans, LA 70112, USA
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Scholte GHA, van Doorn LJ, Cats A, Bloemena E, Lindeman J, Quint WGV, Meuwissen SGM, Kuipers EJ. Genotyping of Helicobacter pylori in paraffin-embedded gastric biopsy specimens: relation to histological parameters and effects on therapy. Am J Gastroenterol 2002; 97:1687-95. [PMID: 12135019 DOI: 10.1111/j.1572-0241.2002.05775.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES Colonization with Helicobacterpylori can lead to GI disease. Bacterial genotypes and host factors, such as acid production, can influence the progress of disease. We investigated H. pylori genotypes and histological parameters in the same paraffin-embedded gastric biopsy specimens. METHODS Paraffin-embedded antrum and corpus biopsy samples from 75 gastroesophageal reflux disease patients were histologically examined and tested for H. pylori vacA (s and m regions), cagA, and iceA genotypes. Patients were investigated at baseline (58 H. pylori positive and 17 H. pylori negative) and after treatment with omeprazole with or without additional antibiotic therapy. RESULTS Genotyping at baseline was complete in 52 (90%) of the 58 H. pylori positive patients. Multiple genotypes were detected in eight (14%) of these. Genotypes were highly consistent between antrum and corpus biopsy specimens at baseline and in follow-up samples. Genotypes from paraffin sections matched those from corresponding cultured strains in 10 selected cases. In the antrum, the degree of inflammation was associated with vacA s1 and cagA+ genotypes, and the degree of neutrophil activity was associated with the cagA+ genotype. In the corpus, the degree of inflammation was significantly associated with vacA s1, cagA+, and iceA1 genotypes and the degree of atrophy was associated with vacA s1, m1, and cagA+ genotypes, whereas the degree of neutrophil activity was associated with vacA s1 and cagA+ genotypes. vacA s2 and cagA-strains appeared more resistant to antibiotic therapy, irrespective of resistance to clarithromycin. CONCLUSIONS Our findings confirm the relevance of the H. pylori genotypes for the severity of gastric disease and the efficacy of antibiotic therapy.
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Affiliation(s)
- Ger H A Scholte
- Department of Pathology, Slotervaart Hospital, Amsterdam, The Netherlands
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Scholte GH, van Doorn LJ, Quint WG, Linderman J. Genotyping of Helicobacter pylori strains in formalin-fixed or Formaldehyde-sublimate-fixed paraffin-embedded gastric biopsy specimens. DIAGNOSTIC MOLECULAR PATHOLOGY : THE AMERICAN JOURNAL OF SURGICAL PATHOLOGY, PART B 2001; 10:166-70. [PMID: 11552719 DOI: 10.1097/00019606-200109000-00004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Different genotypes of Helicobacter pylori can play a role in the development of atrophic gastritis, peptic ulcer disease, and gastric carcinomas. In this study the authors developed polymerase chain reaction assays for the detection and identification of vacA (s- and m-regions), cagA, and iceA genotypes of H. pylori in formalin-fixed or formaldehyde-sublimate-fixed paraffin-embedded gastric biopsy specimens. Polymerase chain reaction products were analyzed by reverse hybridization on a line-probe assay. Complete genotyping was achieved in 26 of 28 samples (93%), and multiple genotypes, indicating the presence of multiple strains, were detected in nine samples (32%). This genotyping method offers the possibility for long-term retrospective studies on H. pylori genotypes and gastric pathology in the same archival gastric tissue specimens.
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Affiliation(s)
- G H Scholte
- Department of Pathology, Slotervaart Hospital Amsterdam, The Netherlands.
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Gebhard S, Benhattar J, Bricod C, Meugé-Moraw C, Delacrétaz F. Polymerase chain reaction in the diagnosis of T-cell lymphoma in paraffin-embedded bone marrow biopsies: a comparative study. Histopathology 2001; 38:37-44. [PMID: 11135045 DOI: 10.1046/j.1365-2559.2001.01057.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS In routine histological analysis of bone marrow biopsies, the distinction between reactive T-cell infiltrates and T-cell lymphoma can be difficult, even with the use of extensive immunohistochemistry. The aim of this study was to evaluate the diagnostic contribution of TCR-gamma gene rearrangement analysed by PCR. METHODS AND RESULTS The samples studied consisted of 46 paraffin-embedded bone marrow biopsies (diagnosis, staging and follow-up) from 26 patients with T-cell lymphoma. The bone marrow biopsies were categorized into three groups according to the morphological and immunohistochemical results. Group 1, positive for T-cell lymphoma (24 bone marrow biopsies), group 2, suspicion of T-cell lymphoma (15 bone marrow biopsies) and group 3, negative for T-cell lymphoma (seven bone marrow biopsies). DNA could be amplified in 45/46 bone marrow biopsies (98%). Clonal rearrangement was detected in 30/45 bone marrow biopsies tested (67%) including 15/24 bone marrow biopsies (62.5%) of group 1, 11/14 (78.5%) of group 2 and 4/7 (57%) of group 3. In total, PCR analysis supported a diagnosis of T-cell lymphoma in 15/45 bone marrow biopsies (33%), in which histological and/or immunohistochemical examination provided inconclusive evidence of malignancy. CONCLUSIONS TCR-gamma PCR is a complementary tool for the assessment of T-cell lymphoma in bone marrow biopsies. Optimal evaluation of bone marrow biopsies requires an integrative approach of all available results from morphology, immunohistochemistry, molecular biology and clinical data.
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Affiliation(s)
- S Gebhard
- University Institute of Pathology, Lausanne, Switzerland.
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Ho GY, Windsor HM. Accurate diagnosis of Helicobacter pylori. Polymerase chain reaction tests. Gastroenterol Clin North Am 2000; 29:903-15. [PMID: 11190075 DOI: 10.1016/s0889-8553(05)70158-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Although PCR has improved considerably the sensitivity of the diagnosis of H. pylori infection, many studies have not shown conclusively the full potential of PCR in clinical diagnosis. In daily clinical practice, PCR does not have to be performed to establish H. pylori infection. PCR is still classified primarily as a research technique in the Helicobacter field. PCR or similar technology will expand in the future when automation and commercialized kits are available to most laboratories. The development of a noninvasive PCR test may prove useful because it may lead ultimately to the determination of the source and route of transmission of this important pathogen.
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Affiliation(s)
- G Y Ho
- NHMRC Helicobacter pylori Research Laboratory, Department of Microbiology, University of Western Australia, Nedlands, Perth, Western Australia
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van Grieken NC, Weiss MM, Meijer GA, Hermsen MA, Scholte GH, Lindeman J, Craanen ME, Bloemena E, Meuwissen SG, Baak JP, Kuipers EJ. Helicobacter pylori-related and -non-related gastric cancers do not differ with respect to chromosomal aberrations. J Pathol 2000; 192:301-6. [PMID: 11054712 DOI: 10.1002/1096-9896(2000)9999:9999<::aid-path697>3.0.co;2-f] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Gastric carcinogenesis is strongly associated with Helicobacter pylori infection, but the underlying genetic mechanisms are largely unknown. The aim of this study was to correlate chromosomal aberrations in gastric cancer to H. pylori status and its different strains, as well as to histological type and other clinico-pathological variables. DNA from 46 gastric cancers (male/female 35/11, age 27-85 years) was extracted from formaldehyde-fixed, paraffin-embedded material and tested for chromosomal gains and losses by comparative genomic hybridization (CGH). Chromosomal aberrations with frequencies of 20% or higher were considered to be non-random changes associated with gastric cancer. The mean number of chromosomal events per tumour was 9.7 (range 0-27), with a mean of 3.2 gains (range 0-16) and 6.5 losses (range 0-15). Gains were most frequently found at chromosomes 8q and 13q (24% and 26%, respectively). Losses were predominantly found on chromosome arms 2q, 9p, 12q, 14q, 15q, 16p, 16q, 17p, 17q, 19p, 19q, and 22q (22%, 30%, 43%, 22%, 33%, 50%, 28%, 50%, 39%, 33%, 39%, and 37%, respectively). Common regions of overlap narrowed down to 2q11-14, 8q23, 9p21, 12q24, 13q21-22, 14q24 and 15q11-15. The mean number of gains was higher in tumours with metastases than in localized tumours (4.1 vs. 1.9, p=0.04). Tumours with a loss at 17p showed a higher number of losses than tumours without a 17p loss (9. 5 vs. 4.7 on average, p<0.001). Neither H. pylori status (+, n=25; -, n=21) nor H. pylori strain was correlated to the total number of events or to any specific chromosomal aberration, nor were there differences between intestinal (n=30) and diffuse (n=15) cancers or any other clinico-pathological variable tested. In conclusion, a complex of chromosomal aberrations is involved in gastric cancer, but their pattern does not depend on H. pylori status or strain, nor on the histological type of the tumour. The exact biological meaning of these aberrations in carcinogenesis needs further clarification.
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Affiliation(s)
- N C van Grieken
- Department of Gastroenterology, Free University Hospital, Amsterdam, The Netherlands
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29
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Argyros FC, Ghosh M, Huang L, Masubuchi N, Cave DR, Grübel P. Evaluation of a PCR primer based on the isocitrate dehydrogenase gene for detection of Helicobacter pylori in feces. J Clin Microbiol 2000; 38:3755-8. [PMID: 11015397 PMCID: PMC87470 DOI: 10.1128/jcm.38.10.3755-3758.2000] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
In order to improve detection and identification of Helicobacter pylori in highly contaminated samples, we evaluated new specific primers based on the DNA base sequence within the isocitrate dehydrogenase (icd) gene to amplify a 1,200-bp DNA segment. The specificity of the icd primer was tested against DNA derived from various bacteria, including 7 Helicobacter species and a panel of 1 gram-variable, 2 gram-positive, and 16 gram-negative bacteria, as well as DNA from houseflies and feces from H. pylori-negative patients. The primers permitted the detection of all clinical H. pylori isolates tested, but no reactions were observed with negative controls. Several procedures for DNA extraction from feces were evaluated using PCR with icd primers. The lower limits of detection of H. pylori DNA from two different sources containing the same number of H. pylori organisms, a pure culture and feces spiked with H. pylori, were established for each extraction method tested. The results were 8.0 x 10(3) CFU/ml for cultures of pure H. pylori, and 8.0 x 10(6) CFU/ml for H. pylori from feces, using the phenol-chloroform method; 8.0 x 10(2) and 7.0 x 10(3) CFU/ml, respectively, for a glass matrix and chaotropic solution protocol; 8.0 x 10(2) and 7.0 x 10(3) CFU/ml, respectively, for the QIAamp tissue kit; and 5.0 x 10(2) and 5.0 x 10(3) CFU/ml, respectively, for the XTRAX DNA extraction kit. We conclude that the use of the icd gene as a primer for PCR represents a specific and sensitive assay for detection of H. pylori in highly contaminated samples.
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Affiliation(s)
- F C Argyros
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
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30
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Gramley WA, Asghar A, Frierson HF, Powell SM. Detection of Helicobacter pylori DNA in fecal samples from infected individuals. J Clin Microbiol 1999; 37:2236-40. [PMID: 10364591 PMCID: PMC85126 DOI: 10.1128/jcm.37.7.2236-2240.1999] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Stool, gastric biopsy, and serum samples were collected from 22 subjects. DNA from stool was extracted, amplified, and hybridized with primers specific for the 16S rRNA gene of Helicobacter pylori. DNA from gastric biopsy specimens was analyzed similarly for comparison. Universal primers were used to confirm successful extraction of DNA from samples. Histologic, serologic, and DNA analyses were scored in a blinded fashion. Universal primer amplification verified successful DNA extraction from all stool and gastric tissue specimens. The gastric tissue DNA assay was positive for H. pylori in 11 of the 22 subjects, correlating completely with histologic and serologic results. Stool DNA was positive for H. pylori by our molecular assay in 8 of these 11 H. pylori-positive subjects. All subjects who were negative by histologic, serologic, and gastric tissue DNA analyses were also negative by stool DNA analysis. Compared to histology, serology, and gastric tissue DNA analyses, the sensitivity of our stool DNA assay was 73%, with a specificity of 100%.
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Affiliation(s)
- W A Gramley
- Departments of Medicine, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908, USA
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Affiliation(s)
- T U Westblom
- Department of Internal Medicine, College of Medicine, Texas A&M University, Central Texas Veterans Health Care System, Temple, USA
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