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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Perfil inflamatório em pacientes com rinossinusite crônica, com e sem pólipo nasal / Inflammatory profile in patients with chronic rinosinusitis, with and without nasal polyp

Leite, Marcelo Gonçalves Junqueira 09 March 2018 (has links)
Introdução: A rinossinusite crônica (RSC) é uma doença prevalente, multifatorial, de fisiopatologia ainda muito pouco compreendida e que tem se apresentado como grande desafio na dificuldade de tratar a doença não controlada. Embora tenha sido aceito recentemente que a RSC precisa ser diferenciada em RSC com e sem pólipos nasais, tornou-se claro que essa distinção é insuficiente para definir claramente subgrupos com fisiopatologia e padrões de citocinas uniformes. Objetivos: Estudar o perfil inflamatório TH nos pacientes da região de Ribeirão Preto-SP, Brasil, e comparar com o perfil de outras populações. Casuística e Metodos: Foi realizado estudo transversal prospectivo para identificar o perfil inflamatório (Th1/Th2/Th17) pela concentração das seguintes citocinas: IFN-?1, IFN-?, TGF-?, IL-33, IL-10, IL- 17A, IL-1?, IL-2 e IL-5, em pacientes com RSC com pólipo nasal (RSCcPN), RSC sem pólipo nasal (RSCsPN) e controles. Foram colhidas amostras de tecido nasal (concha média, seio maxilar, seio etmoidal e pólipo nasal) e analisadas por PCR em tempo real. Resultados: Foram avaliados 117 pacientes, sendo que 67 com RSCcPN e 29 com RSCsPN e 21 controles. Pacientes com RSCcPN apresentaram aumento de todas citocinas em relação ao grupo controle, e os com RSCsPN demonstraram aumento de IFN-?1, IFN-?, IL-10, IL-17A, IL1?, IL-2 e IL-5. Na comparação entre RSCcPN e RSCsPN observou-se diferença nas IFN-?, TGF-?, IL- 2, IL-1? e IL-10. Em relação ao pólipo verificou-se padrão eosinofílico em 70% dos casos e relação com IL-5 e AERD (doença respiratória exacerbada por aspirina, do inglês Aspirin-exacerbated respiratory disease). Conclusões: Os resultados mostraram que não existe um perfil inflamatório padrão de RSCcPN e RSCsPN, confirmando que há uma diversidade ampla nas diferentes populações, podendo estar associado a diferentes fatores ainda a serem estudados. / Introduction: The chronic rhinosinusitis (CRS) is a prevalent, multifactorial disease of pathophysiology that is still poorly understood and has been presented as a major challenge in the difficulty of treating uncontrolled disease. Although it has now been accepted that chronic rhinosinusitis needs to be differentiated into CRS with and without nasal polyps, it has become clear that this distinction is insufficient to clearly define subgroups with uniform cytokine pathophysiology and patterns. Objectives: The objective was to study the inflammatory TH profile in region of the Ribeirão Preto-SP, Brazil, patients and compare it with the profile of other populations. Casuistic and Methods: A prospective cross-sectional study was conducted to identify the inflammatory profile (Th1 / Th2 / Th17) by concentration of the following cytokines: IFN-?1, IFN-?, TGF-?, IL-33, IL-10, IL-17A, IL-1?, IL-2 and IL-5 in patients with chronic rhinosinusitis with nasal polyps (CRSwNP), chronic rhinosinusitis without nasal polyps (CRSsNP) and controls. Samples of nasal tissue (medial turbinate, maxillary sinus, ethmoidal sinus and nasal polyp) were collected and analyzed by real-time PCR. Results: A total of 117 patients were studied, of which 67 had CRSwNP and 29 with CRSsNP and 21 controls. Patients with CRSwNP showed an increase in all cytokines compared to the control group, patients with CRSsNP showed an increased in IFN-?1, IFN-?, IL-10, IL-17A, IL-1b, IL-2 and IL-5. In the comparison between CRSwNP and CRSsNP we found difference in IFN-?, TGF-?, IL-2, IL-1? and IL-10. In relation to the polyp we found an eosinophilic endotypes (70%) and relation with IL-5 and AERD (Aspirin-exacerbated respiratory disease). Conclusions: Our results show that there is no standard inflammatory profile of CRSwNP and CRSsNP, confirming that there is a wide diversity in the different populations, and may be associated with different factors still to be studied.
12

Associação genética do polimorfismo do receptor alfa 1 da interleucina 22 à rinossinusite crônica com e sem polipose nasossinusal / Genetic association of the interleukin 22 alpha 1 receptor polymorphism to chronic rhinosinusitis with and without nasosinusal polyposis

Dinarte, Vanessa Ramos Pires 10 November 2017 (has links)
Introdução: A rinossinusite crônica (RSC), doença multifatorial, na qual podem estar envolvidos fatores genéticos e ambientais, ainda tem muitos aspectos obscuros na sua patogênese. A genética tem se mostrado promissora na elucidação dessa complexa doença. Alguns estudos apontam que a expressão de interleucina (IL) 22 se apresenta reduzida em pacientes com RSC, podendo resultar também na redução da barreira epitelial e diminuição da produção de citocinas pró-inflamatórias Th1. Objetivos: Pesquisar a frequência dos polimorfismos no gene IL22RA1 (receptor subunidade alfa um da interleucina 22) em pacientes portadores de RSC com e sem pólipos nasais e em indivíduos normais, utilizando a técnica de sequenciamento, pelo método de Sanger, para análise de mutações; comparar as frequências dos polimorfismos encontrados no gene IL22RA1 entre os grupos e com a literatura médica e também comparar a técnica de Sanger com outras técnicas convencionais descritas na literatura. Casuística e Métodos: Foram avaliados 247 pacientes, no período de maio de 2011 a fevereiro de 2016, subdivididos em três grupos: 122 pacientes portadores de RSC com pólipos nasais (RSCcPN), 21 casos de RSC sem pólipos nasais (RSCsPN) e 104 voluntários sem sintomatologia nasal. Foram colhidas amostras de sangue venoso periférico de todos os casos e controles, e realizada a extração de DNA, com posterior análise das mesmas. Após a exclusão das perdas, restaram 70 casos de RSCcPN, 14 de RSCsPN e 68 controles. Resultados: O sequenciamento apontou 10 polimorfismos no gene IL22RA1, nos exon 2 (rs10903022, c.113_114insA/Q26Pfs*11, c.74T>A e c.141C>A), exon 4 (rs17852649), exon 5 (rs16829204), exon 6 (rs142356961) e exon 7 (rs17852648, rs34967816 e rs3795299). Os polimorfismos encontrados nos exons 2 (em homozigose), 5 e 6 foram exclusivos do grupo das patologias analisadas (RSC com e sem PN), sendo as duas últimas consideradas variáveis não sinônimas, ou seja, com capacidade de alterar a estrutura da proteína, podendo produzir impacto na patogênese da RSC. A alteração do exon 6 foi a única variante encontrada, com frequência do alelo menor (MAF) inferior a 0,01, exclusiva do grupo RSCcPN. Conclusões: Foram detectados três polimorfismos no gene IL22RA1, que até o momento não estão descritos na literatura, sendo a inserção c.113_114insA/Q26Pfs*11, possivelmente patogênica, com frequência maior nos grupos com RSC. O polimorfismo rs17852649 em heterozigose no exon 4, foi o único com diferença estatística, com predominância do alelo mutado no grupo controle, podendo conferir proteção contra o fenótipo. Também se destaca o polimorfismo rs142356961, no exon 6, do tipo não sinônimo, ou seja, capaz de alterar a estrutura final da proteína, com índice MAF<0,01, sendo exclusiva de pacientes negros portadores de RSCcPN. Estudos de replicação e com maiores coortes serão necessários para determinar se os achados do presente estudo se deram ao acaso. / Introduction: Chronic rhinosinusitis (CRS), a multifactorial disease, with genetic and environmental factors that may be involved, still have many aspects of its pathogenesis unknown. Genetics has shown itself promising in the elucidation of this complex disease. Some studies have indicated that the expression of IL-22 is reduced in patients with CRS, which may result in reduction of the epithelial barrier and decrease in the production of Th1 proinflammatory cytokines. Objectives: To investigate the frequency of polymorphisms in the IL22RA1 gene in patients with chronic rhinosinusitis with and without nasal polyps and in individuals without these pathologies, using the Sanger sequencing technique for mutation analysis; to compare the frequencies of the polymorphisms found in the IL22RA1 gene between the groups and the medical literature and also to compare the Sanger technique with other conventional techniques in the medical literature. Casuistic and Methods: From May 2011 to February 2016, 247 patients were evaluated, subdivided into three groups: 122 patients with chronic rhinosinusitis with nasal polyps (CRSwNP), 21 cases of chronic rhinosinusitis without nasal polyps (CRSsNP) and 104 volunteers without nasal symptoms. Samples of peripheral venous blood were collected from all cases and controls, and DNA extraction was performed, with subsequent analysis at the Molecular Genetics Laboratory - Ribeirão Preto Medical School Blood Center - USP. After the loss exclusion, there were 70 cases of CRSwNP, 14 CRSsNP and 68 controls. Results: Sequencing indicated 10 polymorphisms in the IL22RA1 gene, exon 2 (rs10903022, c.113_114insA / Q26Pfs * 11, c.74T> A and c.141C> A), exon 4 (rs17852649), exon 5 (rs16829204), exon 6 (rs142356961) and exon 7 (rs17852648, rs34967816 and rs3795299). Polymorphisms in exons 2 (in homozygosis), 5 and 6 were exclusive from the analyzed pathologies group (RSC with and without NP), the latter two being considered non-synonymous variables, that is, with capacity to alter the protein structure, being able to produce impact on the pathogenesis of CRS. The exon 6 alteration was the only variant found, with the minor allele frequency (MAF) under 0.01, exclusive of the RSCcPN group. Conclusions: Three polymorphisms were detected in the IL22RA1 gene, which until now are not described in the literature, and the possibly pathogenic insert c.113_114insA / Q26Pfs * 11, with a higher frequency in the groups with CRS. The polymorphism rs17852649 in heterozygosis in exon 4 was the only one with a statistical difference, with predominance of the mutated allele in the control group, which could confer protection against the phenotype. Also notable is the polymorphism rs142356961, in exon 6, of the non-synonymous type, that is, capable of altering the final structure of the protein, with MAF index <0.01, being exclusive in black patients with chronic rhinosinusitis with nasal polyps. Replication studies and larger cohorts are necessary to rule out the findings at random.
13

The Modulating Effect of Fatty Acids on the Lipid Profile in Colon Epithelial Mucosa In Vivo.

Abrahams, Celeste H. January 2009 (has links)
<p>Several abnormal conditions, including some cancers, have been associated with changes in the membrane lipid and FA composition. Dietary fat serves as a major source of lipids and FA, particularly the polyunsaturated fatty acids (PUFA), n-6 and n-3. High intakes of n-6 PUFA have been linked to the development of colon cancer in association with low n-3 PUFA intake. Therefore understanding the differences in the lipid and FA profiles between cancer and normal cells in the colon, and the role diet plays in these factors may be invaluable in understanding their role in carcinogenesis. This study compares the lipid profile of azoxymethane (AOM) induced colon polyps to that of the surrounding mucosa tissue in rats fed a diet high in n-6 PUFA. Male Fischer rats were fed the AIN-76A diet containing sunflower oil that has high n-6 PUFA content for a period of nine months. Results indicate that the lipid and FA content of the colon polyps differs significantly from the surrounding mucosa. Colon polyps had an increase in membrane phopholipids phosphatidylcholine (PC) and phosphatidylethanolamine (PE). Changes in membrane fluidity were indicated by the decrease (p&lt / 0.05) in the PC/PE and cholesterol/phospholipids (chol/PL) ratios, and increase (p&lt / 0.05) in the polyunsaturated FA/saturated FA (P/S) ratio. Metabolism of FA was significantly altered in the polyps favouring n-6 FA metabolism and the production of prostaglandin E2. No clear indication of impaired &Delta / 6-desauturase enzyme activity was noticed. Increases in the n-6 PUFA content could be a reflection of the dietary FA intake that increases FA incorporation in the polyps. Changes in the FA parameters of the polyps, particularly an increase in C20:4n-6 and the n6/n3 ratio have been shown to contribute to the rapid growth of cancer tissue. These lipid changes associated with the development of colon polyps could provide unique targets for developing strategies in chemoprevention by dietary manipulation.</p>
14

Urine metabolomics and colorectal cancer screening

Wang, Haili Unknown Date
No description available.
15

The Modulating Effect of Fatty Acids on the Lipid Profile in Colon Epithelial Mucosa In Vivo.

Abrahams, Celeste H. January 2009 (has links)
<p>Several abnormal conditions, including some cancers, have been associated with changes in the membrane lipid and FA composition. Dietary fat serves as a major source of lipids and FA, particularly the polyunsaturated fatty acids (PUFA), n-6 and n-3. High intakes of n-6 PUFA have been linked to the development of colon cancer in association with low n-3 PUFA intake. Therefore understanding the differences in the lipid and FA profiles between cancer and normal cells in the colon, and the role diet plays in these factors may be invaluable in understanding their role in carcinogenesis. This study compares the lipid profile of azoxymethane (AOM) induced colon polyps to that of the surrounding mucosa tissue in rats fed a diet high in n-6 PUFA. Male Fischer rats were fed the AIN-76A diet containing sunflower oil that has high n-6 PUFA content for a period of nine months. Results indicate that the lipid and FA content of the colon polyps differs significantly from the surrounding mucosa. Colon polyps had an increase in membrane phopholipids phosphatidylcholine (PC) and phosphatidylethanolamine (PE). Changes in membrane fluidity were indicated by the decrease (p&lt / 0.05) in the PC/PE and cholesterol/phospholipids (chol/PL) ratios, and increase (p&lt / 0.05) in the polyunsaturated FA/saturated FA (P/S) ratio. Metabolism of FA was significantly altered in the polyps favouring n-6 FA metabolism and the production of prostaglandin E2. No clear indication of impaired &Delta / 6-desauturase enzyme activity was noticed. Increases in the n-6 PUFA content could be a reflection of the dietary FA intake that increases FA incorporation in the polyps. Changes in the FA parameters of the polyps, particularly an increase in C20:4n-6 and the n6/n3 ratio have been shown to contribute to the rapid growth of cancer tissue. These lipid changes associated with the development of colon polyps could provide unique targets for developing strategies in chemoprevention by dietary manipulation.</p>
16

Evaluation of medical and/or surgical treatment of anosmia/hyposmia in association with inflammatory disease of the upper airway /

Hedén Blomqvist, Ebba, January 2004 (has links)
Diss. (sammanfattning) Stockholm : Karol. inst., 2004. / Härtill 4 uppsatser.
17

Variabilidade interobservador no diagnóstico histológico dos pólipos colorretais

Cerato, Marlise Mello January 2006 (has links)
O manejo clínico dos pacientes com pólipos colorretais é principalmente baseado na histologia das lesões removidas. Em conseqüência, o diagnóstico histológico tem um papel muito importante na decisão terapêutica e a uniformidade de interpretação dos diferentes laudos de patologia é essencial. Apesar destas relevantes implicações, poucos estudos existem avaliando a variabilidade interobservador na elucidação dessa doença e a concordância não é considerada satisfatória. Objetivo: avaliar a variabilidade interobservador no diagnóstico histológico dos pólipos colorretais. Metodologia: foram avaliados 230 pólipos colorretais no Serviço de Patologia do Hospital de Clínicas de Porto Alegre (HCPA). Quatro patologistas examinaram todas as lâminas de forma independente e “cega”, ou seja, sem conhecimento do diagnóstico elaborado pelo seu colega. As lesões colorretais foram classificadas em relação ao diagnóstico: pólipo e carcinoma invasivo e quanto ao tipo de pólipo: adenomatoso versus hiperplásico. Nos adenomas foi avaliado o tipo histológico (tubular, túbulo-viloso e viloso) e o grau de displasia (baixo e alto grau). Resultados: o Kappa médio, em relação ao tipo de lesão, foi de 0,794, considerado moderado. Quanto ao tipo de pólipo, o Kappa médio foi 0,852, ou seja, uma ótima concordância. Em relação aos adenomas, no que se refere ao tipo histológico, obteve-se um Kappa médio, fraco de 0,291, e na avaliação do grau de displasia o Kappa médio foi regular com valor de 0,420. Conclusão: o índice de concordância, entre os quatro observadores foi considerado de moderado a ótimo no tipo de lesão e de pólipo, porém a variabilidade foi grande na avaliação dos adenomas, tanto no que concerne ao tipo histológico quanto ao grau de displasia com um kappa de fraco a regular. / The clinical management of patients with colorectal polyps is mainly based on the histology of the removed lesions. Therefore, the histological diagnosis has a very important role in deciding the treatment and the uniform interpretation of the different pathology reports is essential. In spite of these relevant implications, there are only very few studies assessing the interobserver variability in such diagnosis and the concordance of reports among different examiners is not considered satisfactory. Objective: to assess interobserver variability in the pathology reports in the diagnosis of colorectal polyps. Method: at the Department of Pathology of HCPA [Hospital de Clínicas de Porto Alegre] 230 slides of colorectal polyps were examined by four independent pathologists “blindly”, that is, the diagnosis given by their colleagues was not known. Colorectal lesions were classified according to the diagnosis as polyp or invasive cancer and to the polyp type (adenomatous or hyperplasic). The histological type of the adenomas (tubular, tubulovillous and villous) and the grade of dysplasia (high or low) were also assessed. Results: mean kappa of the type of lesion was 0.794, which is considered moderate. The mean kappa of 0.852 for the type of polyp is considered excellent concordance. Regarding the histology of adenomas, the mean kappa was 0.291, considered weak. The assessment of the degree of dysplasia showed a regular Kappa of 0.420. Conclusion: the concordance rate among the four pathologists was considered to be moderate to excellent for the type of lesion and of polyp but there was great variability in the assessment of adenomas both for the histological type and for dysplasia, showing a weak to regular kappa.
18

Variabilidade interobservador no diagnóstico histológico dos pólipos colorretais

Cerato, Marlise Mello January 2006 (has links)
O manejo clínico dos pacientes com pólipos colorretais é principalmente baseado na histologia das lesões removidas. Em conseqüência, o diagnóstico histológico tem um papel muito importante na decisão terapêutica e a uniformidade de interpretação dos diferentes laudos de patologia é essencial. Apesar destas relevantes implicações, poucos estudos existem avaliando a variabilidade interobservador na elucidação dessa doença e a concordância não é considerada satisfatória. Objetivo: avaliar a variabilidade interobservador no diagnóstico histológico dos pólipos colorretais. Metodologia: foram avaliados 230 pólipos colorretais no Serviço de Patologia do Hospital de Clínicas de Porto Alegre (HCPA). Quatro patologistas examinaram todas as lâminas de forma independente e “cega”, ou seja, sem conhecimento do diagnóstico elaborado pelo seu colega. As lesões colorretais foram classificadas em relação ao diagnóstico: pólipo e carcinoma invasivo e quanto ao tipo de pólipo: adenomatoso versus hiperplásico. Nos adenomas foi avaliado o tipo histológico (tubular, túbulo-viloso e viloso) e o grau de displasia (baixo e alto grau). Resultados: o Kappa médio, em relação ao tipo de lesão, foi de 0,794, considerado moderado. Quanto ao tipo de pólipo, o Kappa médio foi 0,852, ou seja, uma ótima concordância. Em relação aos adenomas, no que se refere ao tipo histológico, obteve-se um Kappa médio, fraco de 0,291, e na avaliação do grau de displasia o Kappa médio foi regular com valor de 0,420. Conclusão: o índice de concordância, entre os quatro observadores foi considerado de moderado a ótimo no tipo de lesão e de pólipo, porém a variabilidade foi grande na avaliação dos adenomas, tanto no que concerne ao tipo histológico quanto ao grau de displasia com um kappa de fraco a regular. / The clinical management of patients with colorectal polyps is mainly based on the histology of the removed lesions. Therefore, the histological diagnosis has a very important role in deciding the treatment and the uniform interpretation of the different pathology reports is essential. In spite of these relevant implications, there are only very few studies assessing the interobserver variability in such diagnosis and the concordance of reports among different examiners is not considered satisfactory. Objective: to assess interobserver variability in the pathology reports in the diagnosis of colorectal polyps. Method: at the Department of Pathology of HCPA [Hospital de Clínicas de Porto Alegre] 230 slides of colorectal polyps were examined by four independent pathologists “blindly”, that is, the diagnosis given by their colleagues was not known. Colorectal lesions were classified according to the diagnosis as polyp or invasive cancer and to the polyp type (adenomatous or hyperplasic). The histological type of the adenomas (tubular, tubulovillous and villous) and the grade of dysplasia (high or low) were also assessed. Results: mean kappa of the type of lesion was 0.794, which is considered moderate. The mean kappa of 0.852 for the type of polyp is considered excellent concordance. Regarding the histology of adenomas, the mean kappa was 0.291, considered weak. The assessment of the degree of dysplasia showed a regular Kappa of 0.420. Conclusion: the concordance rate among the four pathologists was considered to be moderate to excellent for the type of lesion and of polyp but there was great variability in the assessment of adenomas both for the histological type and for dysplasia, showing a weak to regular kappa.
19

Variabilidade interobservador no diagnóstico histológico dos pólipos colorretais

Cerato, Marlise Mello January 2006 (has links)
O manejo clínico dos pacientes com pólipos colorretais é principalmente baseado na histologia das lesões removidas. Em conseqüência, o diagnóstico histológico tem um papel muito importante na decisão terapêutica e a uniformidade de interpretação dos diferentes laudos de patologia é essencial. Apesar destas relevantes implicações, poucos estudos existem avaliando a variabilidade interobservador na elucidação dessa doença e a concordância não é considerada satisfatória. Objetivo: avaliar a variabilidade interobservador no diagnóstico histológico dos pólipos colorretais. Metodologia: foram avaliados 230 pólipos colorretais no Serviço de Patologia do Hospital de Clínicas de Porto Alegre (HCPA). Quatro patologistas examinaram todas as lâminas de forma independente e “cega”, ou seja, sem conhecimento do diagnóstico elaborado pelo seu colega. As lesões colorretais foram classificadas em relação ao diagnóstico: pólipo e carcinoma invasivo e quanto ao tipo de pólipo: adenomatoso versus hiperplásico. Nos adenomas foi avaliado o tipo histológico (tubular, túbulo-viloso e viloso) e o grau de displasia (baixo e alto grau). Resultados: o Kappa médio, em relação ao tipo de lesão, foi de 0,794, considerado moderado. Quanto ao tipo de pólipo, o Kappa médio foi 0,852, ou seja, uma ótima concordância. Em relação aos adenomas, no que se refere ao tipo histológico, obteve-se um Kappa médio, fraco de 0,291, e na avaliação do grau de displasia o Kappa médio foi regular com valor de 0,420. Conclusão: o índice de concordância, entre os quatro observadores foi considerado de moderado a ótimo no tipo de lesão e de pólipo, porém a variabilidade foi grande na avaliação dos adenomas, tanto no que concerne ao tipo histológico quanto ao grau de displasia com um kappa de fraco a regular. / The clinical management of patients with colorectal polyps is mainly based on the histology of the removed lesions. Therefore, the histological diagnosis has a very important role in deciding the treatment and the uniform interpretation of the different pathology reports is essential. In spite of these relevant implications, there are only very few studies assessing the interobserver variability in such diagnosis and the concordance of reports among different examiners is not considered satisfactory. Objective: to assess interobserver variability in the pathology reports in the diagnosis of colorectal polyps. Method: at the Department of Pathology of HCPA [Hospital de Clínicas de Porto Alegre] 230 slides of colorectal polyps were examined by four independent pathologists “blindly”, that is, the diagnosis given by their colleagues was not known. Colorectal lesions were classified according to the diagnosis as polyp or invasive cancer and to the polyp type (adenomatous or hyperplasic). The histological type of the adenomas (tubular, tubulovillous and villous) and the grade of dysplasia (high or low) were also assessed. Results: mean kappa of the type of lesion was 0.794, which is considered moderate. The mean kappa of 0.852 for the type of polyp is considered excellent concordance. Regarding the histology of adenomas, the mean kappa was 0.291, considered weak. The assessment of the degree of dysplasia showed a regular Kappa of 0.420. Conclusion: the concordance rate among the four pathologists was considered to be moderate to excellent for the type of lesion and of polyp but there was great variability in the assessment of adenomas both for the histological type and for dysplasia, showing a weak to regular kappa.
20

AnÃlise imunohistoquÃmica da expressÃo das proteÃnas p53 e ki-67 em adenomas colorretais / EVALUATION IMUNOHISTOQUÃMICA OF the EXPRESSION OF PROTEINS P53 AND KI-67 IN ADENOMAS COLORRETAIS

Walysson Alves Tocantins de Souza 08 October 2010 (has links)
CoordenaÃÃo de AperfeiÃoamento de NÃvel Superior / O objetivo deste estudo, à avaliar a expressÃo das proteÃnas p53 e Ki-67 em adenomas colorretais, suas relaÃÃes com caracterÃsticas clinico-patolÃgicas e avaliar a relaÃÃo entre as duas proteÃnas. A amostra consistiu de 50 pÃlipos adenomatosos encontrados em pacientes submetidos a exames colonoscÃpicos. ApÃs a realizaÃÃo de polipectomia, os pÃlipos eram conservados em soluÃÃo tamponada de formalina a 10% e submetidos à rotina de preparo de cortes e lÃminas e coloraÃÃo pela hematoxilina-eosina para confirmaÃÃo da natureza adenomatosa. Realizou-se imunohistoquÃmica especÃfica para as proteÃnas p53 e Ki-67 pelo mÃtodo imunoenzimÃtico da streptoavidina-biotina-peroxidase para cada adenoma. A proteÃna p53 foi positiva em 18% dos adenomas e a proteÃna Ki-67, expresso como Ãndice (i.Ki-67), obteve mÃdia de 0,49. Houve diferenÃa estatisticamente significante na expressÃo de p53 (p=0,0003) e Ki-67(p=0,02) entre os adenomas com alto e baixo grau de displasia, sendo maior no primeiro grupo. Encontrou-se, ainda maior expressÃo da proteÃna Ki-67 nos adenomas retais em relaÃÃo aos de localizaÃÃo cÃlica (p= 0,02). NÃo houve relaÃÃo entre a expressÃo das duas proteÃnas, na amostra / Ki-67 (p=0,02) expression between adenomas with high and low grade dysplasia, greater in the first group. There was greater expression of Ki-67 protein in the rectal adenomas than colic adenomas (p=0,02). There was no relation between the expression of the two proteins in the sample.

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