RESUMO
INTRODUCTION: CD10 is a cell membrane-bound endopeptidase which is expressed in normal small bowel but not in normal colon. It is aberrantly expressed in a small proportion of colorectal cancers (CRC) and this has been associated with liver metastasis and poor prognosis. We sought to investigate the mechanism of CD10 activity and its association with clinicopathological features. MATERIAL AND METHODS: CD10 was stably knocked down by lentiviral shRNA transduction in the CRC cell lines SW480 and SW620 which are derived from a primary tumour and its corresponding metastasis respectively. Expression of epithelial - mesenchymal transition (EMT) markers was tested as well as the effect of knockdown on cell viability, migration and invasion assays. In addition, immunohistochemical expression of CD10 in primary colorectal tumours (Nâ¯=â¯84) in a tissue microarray was digitally quantified and analysed for associations with clinicopathological variables. RESULTS: Knockdown of CD10 did not alter cell viability in SW480, but migration and invasion levels increased (Pâ¯<â¯0.001 for each) and this was associated with a cadherin switch. In SW620, CD10 knockdown caused a reduction in cell viability after 72â¯h (Pâ¯=â¯0.0018) but it had no effect on cell migration and invasion. Expression of epithelial CD10 in primary tumours was associated with presence of lymph node invasion (Pâ¯=â¯0.001) and advanced Duke's stage (Pâ¯=â¯0.001). CONCLUSIONS: Our results suggest that the function of CD10 may change during tumour evolution. It may inhibit cell motility in early-stage disease whilst promoting cell viability in late-stage disease. It has a complex role and further studies are needed to elucidate the suitability of CD10 as a prognostic marker or therapeutic target.
Assuntos
Movimento Celular , Proliferação de Células , Neoplasias Colorretais/patologia , Regulação Neoplásica da Expressão Gênica , Neprilisina/metabolismo , Caderinas/metabolismo , Ciclo Celular , Neoplasias Colorretais/genética , Neoplasias Colorretais/metabolismo , Transição Epitelial-Mesenquimal , Humanos , Metástase Linfática , Invasividade Neoplásica , Neprilisina/antagonistas & inibidores , Neprilisina/genética , RNA Interferente Pequeno/genética , Análise Serial de Tecidos , Células Tumorais CultivadasRESUMO
Endometriosis is a common condition with significant morbidity. There have been case reports of endometrial deposits affecting the sciatic nerve. Sciatic nerve endometriosis presents with cyclical sciatica and is often difficult to diagnose as it mimics many other causes of sciatica. We report the first case of histological proven endometrial carcinoma arising in a pre-existing sciatic nerve endometriosis. This was initially managed with radiotherapy however symptoms persisted and she opted to have surgery with the aim of better symptom control and long-term prognosis.