Programa de Pós-Graduação em Oncologia e Ciências Médicas - PPGOCM/NPO

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/4631

O Programa de Pós-Graduação em Oncologia e Ciências Médicas (PPGOCM) integra o Núcleo de Pesquisas em Oncologia (NPO) da Universidade Federal do Pará (UFPA). Trata-se do único centro de referência em pesquisa e formação de recursos humanos stricto sensu na área de oncologia na região Norte do Brasil. Os outros centros se concentram nas cidades do Rio de Janeiro e São Paulo.

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    Polimorfismo do gene da interleucina IL-1B e sua associação com o risco ao desenvolvimento do câncer gástrico em uma população do norte do Brasil
    (Universidade Federal do Pará, 2016-12-22) CASTRO, Yaisa Gomes de; SANTOS, Ândrea Kely Campos Ribeiro dos; http://lattes.cnpq.br/3899534338451625
    Cancer is understood as a set of diseases with similar characteristics, but with great heterogeneity that occurs in a random manner and covers both tumor and inflammatory and immune cells. Gastric tumors, in Brazil and notably in the State of Pará, have a high incidence. In general, gastric cancer has a multifactorial etiology. Communication and cellular signaling that regulate the immune system are facilitated by interleukins that represent small, specific proteins, have diverse functions, they regulate transcription factors, role genes, inflammation, differentiation, proliferation, and secretion of antibodies. Single polymorphism nucleotide, in specific IL-1B proinflammatory interleukin gene, is associated with the immune response to H. pylori infection. Thefore variations within the IL-1 family genes were associated with susceptibility to the development of gastric cancer. In this case-control study, we investigated whether the polymorphisms IL-1BF1 (rs16944) and IL-1BE1 (rs1143627) are associated with the risk of developing gastric cancer in a population from the north of Brazil; Compared to their respective genotypes, defined haplotypes and these related to ancestry and their rates. SNPs were genotyped by VIC / FAM (Real Time PCR, Fluorescent, Life Technologies, CA, USA) labeled probes. The biostatistical analyzes showed that for the demographic variables, there were significant differences between the groups in European and African ancestry. The distribution of the genotypic, allelic and haplotype frequencies of the IL-1B gene was not statistically significant between the groups. More comprehensive studies and analyzes are needed to help understand better why these polymorphisms in this population do not appear to be associated with the development of the disease in question.
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    Polimorfismos de citocinas (TNF-A, IL-10 e IL-17) no câncer gástrico
    (Universidade Federal do Pará, 2016-02-02) OLIVEIRA, Gabriela Almeida de; SANTOS, Ândrea Kely Campos Ribeiro dos; http://lattes.cnpq.br/3899534338451625
    Gastric cancer (GC) is the second most common malignancy among men and the third in women, and therefore, an important public health problem in northern Brazil. The investigation of genetic factors related to immunological characteristics can aid the understanding of carcinogenesis in CG. The objective of the present work was investigate polymorphisms present in interleukin genes IL17G-197A, IL 17FA7488G, TNFαG-308A, IL10G-1082A, IL10C-819T e IL10C-592A, on samples of patients with gastric cancer and healthy patients without cancer. Case group was composed of 100 patients diagnosed with CG, met in the Hospital HUJBB (Pará, Brazil). Control group was composed of 100 individuals without cancer, unrelated, of the same population. The genetic material was extracted from 5 mL of peripheral blood with the DNA commercial kit from Roche, followed by quantification with the NanoDrop 1000 spectrophotometer. Analysis of the molecular polymorphisms was performed by real-time PCR with Taqman® probes. Measures of ancestry were investigated using a panel of 48 autosomal ancestry informative markers (AIMs). The proportions of ancestry of European, African and Amerindian were estimated using the software STRUCTURE v. 2.3.3. It was observed that the ethnic composition of the case group was 27% African, 42% European and 31% of Amerindian, while in the control group 21% African, 52% of European and 27% of Amerindian. In relation to the set of markers of interleukin IL-10 (IL10G-1082A, IL10C-819T, IL10C-592A), when the genotypic and haplotypic patterns were compared, it was noted that the haplotype distribution related to high expression (GCC/GCC, GCA, GCC/GCC/GTC, GCA/GCA, GCA/GTA) was more frequent in the patients with gastric cancer (P = 1,15e-11; OR = 2.630; IC 95% = 2.116-3.271). Among the individuals with the genotype related to the high production of IL-10, it was observed that the control group had more European contribution in their ancestry (P = 1e-06) while the group of patients with CG had more African contribution in their ancestry (P = 1.4e-5). Patients who presented TNF-α AA and TNF-α AG genotypes for TNF-α gene mutation presented a higher risk for development of cancer (P<0.001; OR 10.375; IC 95% 3.149-34.061). It is concluded that patients with a distribution of haplotypic markers of interleukin IL-10 (IL10G-1082A, IL10C-819T, IL10C-592A) related to a higher expression and higher contribution of African ancestry have a high risk of developing gastric cancer.
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