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| CAVALCANTI,MARIANA B.; FERNANDES,THIAGO S.; SILVA,EDVANE B.; AMARAL,ADEMIR. |
| The aim of this research was to evaluate the relationship between p53 protein levels and absorbed doses from in vitro irradiated human lymphocytes. For this, samples of blood from 23 donors were irradiated with 0.5; 1; 2; and 4 Gy from a Cobalt-60 source, and the percentages of lymphocytes expressing p53 were scored using Flow Cytometry. The subjects were divided into 3 groups, in accordance with the p53 levels expressed per radiation dose: low (Group I), high (Group II), and excessive levels (Group III). For all groups, the analyses showed that the p53 expression levels increase with the absorbed dose. Particularly for groups I and II, the correlation between this protein expression and the dose follows the linear-quadratic model, such as for radioinduced... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological Dosimetry; Cellular radiobiology; Flow Cytometry; P53 protein; Radiosensitivity. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401783 |
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| Engelman,D.E.S.; Andrade,L.A.L.A.; Vassallo,J.. |
| The etiopathogenesis of vulvar intraepithelial neoplasia (VIN III) and invasive squamous cell carcinoma are largely unknown. Since there are few studies on Brazilian patients, our purpose was to determine the frequency of human papillomavirus (HPV) infection and the expression of p53 in these lesions, and associate them with other factors such as age, morphological subtypes, multicentric and multifocal disease. Thirty-eight cases of VIN III, nine of superficially invasive carcinoma, and 55 of invasive vulvar carcinoma were retrospectively evaluated from 1983 to 1995 for the presence of HPV by immunohistochemistry and in situ hybridization, and for p53 protein expression by immunohistochemistry on paraffin sections. All cases for whom material (slides and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vulvar intraepithelial neoplasia; Vulvar carcinoma; Human papillomavirus; P53 protein. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000900003 |
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| Otero,Luize; Cavalcanti Júnior,Geraldo Barroso; Klumb,Claudete Esteves; Scheiner,Marcos Antonio Mauricio; Magluta,Eliane Pereira Simões; Fernandez,Teresa de Souza; Silva,Maria Luiza Macedo; Pires,Virgínia; Andrade,Gabriela Vasconcelos; Maia,Raquel Ciuvalschi; Tabak,Daniel. |
| chronic myeloid leukemia (CML) have been described. This chromosomal region contains the tumor suppressor gene TP53 that may be an important factor in the evolution of this disease. In this study, we used flow cytometry and western blotting to assess p53 protein expression and single stranded conformational polymorphism to examine TP53 gene alterations in three patients with CML who showed alterations in 17p. Only the case with del(17)(p11) had p53 expression positive by flow cytometry and an abnormal migration pattern by SSCP analysis. The importance of the correlation between the results obtained with these techniques, as well as the clinical course of the patients, are discussed. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chronic myeloid leukemia; Chromosome 17; TP53 gene; P53 protein. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100007 |
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| Sá,Cláudia T.; Fonseca,Linaena M. S.; Cardoso,Sérgio V.; Aguiar,Maria Cássia F.; Carmo,Maria Auxiliadora V. do. |
| p53 alterations have been implicated in oral carcinogenesis process. Squamous cell carcinoma is the most common malignancy of the oral cavity, the tongue being the most frequent affected site. The aim of this study was to compare p53 immunoexpression in 43 samples of oral SCC from 5 different anatomical sites: tongue, floor of the mouth, alveolar ridge/gingiva, retromolar region and other regions of the oral cavity. Thirty-three lesions (76,8%) showed positivity for p53 (mean index of 48,37%). No statistically significant differences were found between p53 expression and the different oral sites analyzed. Similarly, no differences were found when comparing tongue lesions with the remaining sites. These results suggest that it might not exist any difference... |
| Tipo: Journal article |
Palavras-chave: P53 protein; Immunohistochemistry; Oral squamous cell carcinoma (OSCC). |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300018 |
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