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18.
Dig Dis Sci ; 57(10): 2680-6, 2012 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22615017

RESUMO

BACKGROUND: Colonoscopy fails to achieve cecal intubation in 5-10 % of cases. Many of these cases can be completed using balloon-assisted colonoscopy, either with the single-balloon colonoscopy (SBC) or the double-balloon colonoscopy (DBC) techniques. AIM: To compare the completion rates of SBC and DBC in patients with previous incomplete conventional colonoscopy. METHODS: Between August 2009 and July 2011 either SBC or DBC was performed in 53 patients in whom previous conventional colonoscopy did not achieve cecal intubation. The medical records of these 53 patients were reviewed retrospectively for details regarding (1) indication for the initial colonoscopy, (2) patient characteristics, (3) data from the initial colonoscopy, and (4) details on both SBC and DBC. RESULTS: SBC was successful in intubating the cecum in 100 % (26/26) of patients and DBC was successful in 93 % (25/27) of patients. The median (range) time to reach the cecum was 17 (9-43) min in the SBC group and 20 (7-58) min in the DBC group (P = 0.37). The presence of polyps was an entirely new finding in 35 % (9/26) of patients in the SBC group and 30 % (8/27) of patients in DBC group. Therapeutics were performed in 73 % (19/26) of patients in SBC group and 67 % (18/27) of patients in DBC group. CONCLUSION: For patients with incomplete conventional colonoscopy, SBC and DBC offer high cecal intubation rates as well as detection of additional polyps and therapeutic capability. Either SBC or DBC can be considered after incomplete conventional colonoscopy.


Assuntos
Colonoscopia/instrumentação , Colonoscopia/métodos , Adulto , Idoso , Idoso de 80 Anos ou mais , Pólipos do Colo/diagnóstico , Colonoscópios , Colonoscopia/normas , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
19.
Mol Cancer Res ; 9(12): 1621-31, 2011 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-21989104

RESUMO

Quiescin sulfhydryl oxidase 1 (QSOX1) oxidizes sulfhydryl groups to form disulfide bonds in proteins. We previously mapped a peptide in plasma from pancreatic ductal adenocarcinoma (PDA) patients back to an overexpressed QSOX1 parent protein. In addition to overexpression in pancreatic cancer cell lines, 29 of 37 patients diagnosed with PDA expressed QSOX1 protein in tumor cells, but QSOX1 was not detected in normal adjacent tissues or in a transformed, but nontumorigenic cell line. To begin to evaluate the advantage QSOX1 might provide to tumors, we suppressed QSOX1 protein expression using short hairpin (sh) RNA in two pancreatic cancer cell lines. Growth, cell cycle, apoptosis, invasion, and matrix metalloproteinase (MMP) activity were evaluated. QSOX1 shRNA suppressed both short and long isoforms of the protein, showing a significant effect on cell growth, cell cycle, and apoptosis. However, QSOX1 shRNA dramatically inhibited the abilities of BxPC-3 and Panc-1 pancreatic tumor cells to invade through Matrigel in a modified Boyden chamber assay. Mechanistically, gelatin zymography indicated that QSOX1 plays an important role in activation of MMP-2 and MMP-9. Taken together, our results suggest that the mechanism of QSOX1-mediated tumor cell invasion is by activation of MMP-2 and MMP-9.


Assuntos
Metaloproteinase 2 da Matriz/metabolismo , Metaloproteinase 9 da Matriz/metabolismo , Invasividade Neoplásica/genética , Oxirredutases atuantes sobre Doadores de Grupo Enxofre/genética , Oxirredutases atuantes sobre Doadores de Grupo Enxofre/metabolismo , Apoptose/genética , Ciclo Celular/genética , Linhagem Celular Tumoral , Colágeno/química , Combinação de Medicamentos , Regulação Neoplásica da Expressão Gênica , Inativação Gênica , Humanos , Laminina/química , Metaloproteinase 2 da Matriz/genética , Metaloproteinase 9 da Matriz/genética , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/patologia , Isoformas de Proteínas/metabolismo , Proteoglicanas/química , RNA Interferente Pequeno/genética
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