RESUMEN
Telocytes (TC) are cells with telopodes (Tp), very long prolongations (up to 100 µm) with an uneven caliber ( www.telocytes.com ). Factors determining the dynamics of cellular prolongations are still unknown, although previous studies showed telopode motility in TC cultures. We comparatively investigated, by time-lapse videomicroscopy, the dynamics of Tp of mouse heart TC seeded on collagen, fibronectin, and laminin. Under our experimental conditions, TC and fibroblasts (cell line L929) behaved differently in terms of adherence, spreading, and prolongation extension. Fibroblasts showed lower spreading on the matrix proteins used. The time needed for spreading was 2-4 h for TC, versus 8-10 h for fibroblasts. The values for final cell surface area after spreading were between 200 and 400 µm(2) for fibroblasts and 800-2,000 µm(2) for TC. TC showed a more than three times higher ability to spread on the tested matrix proteins. An extremely low capacity to extend prolongations with lengths shorter than cell bodies was noted for fibroblasts, while TC extended prolongations longer than the cell body length, with a moniliform appearance. The stronger adherence and spreading were noted for TC seeded on fibronectin, while the lowest were on laminin. Collagen determined an intermediate adherence and spreading for TC, but the highest dynamics in Tp extensions. In conclusion, TC behave differently than fibroblasts in terms of adherence, spreading, and cell prolongation extension when seeded on various matrix proteins in cell culture.
Asunto(s)
Proteínas de la Matriz Extracelular/metabolismo , Fibroblastos/fisiología , Telocitos/fisiología , Telopodos/fisiología , Animales , Adhesión Celular/fisiología , Técnicas de Cultivo de Célula , Línea Celular , Movimiento Celular/fisiología , Células Cultivadas , Colágeno/metabolismo , Fibroblastos/citología , Fibronectinas/metabolismo , Cinética , Laminina/metabolismo , Ratones , Microscopía Electrónica de Transmisión , Microscopía por Video/métodos , Miocardio/citología , Telocitos/citología , Telocitos/ultraestructura , Imagen de Lapso de Tiempo/métodosRESUMEN
OBJECTIVES: EWS/FLI-1 fusion mainly appears in Ewing's sarcoma or the primitive neuroectodermal tumors and represents a genomic marker for these tumors. However, it can appear with lower frequency in other soft tissue tumors. The paper investigates the presence of EWS/FLI-1 fusion in clinically diagnosed sarcoma belonging to different non-Ewing connective tissue tumors in order to search for a possible new biomarker valuable for investigators. METHODOLOGY: 20 patients with soft tissue tumors, who underwent surgery, were tested. Intra-operative samples of normal and tumor tissue were collected for histopathological diagnosis and genetics determinations. The patients' RNA from tumor and normal peritumoral tissue was extracted and EWS/FLI-1 fusion screened by quantitative real-time PCR. The relative expression of the fusion in the tumor sample was compared to the similar expression in normal tissue. RESULTS: The amplification in the threshold zone was shown by 5 samples (25%): 2 clear cell sarcoma, 1 fibrosarcoma, 1 malignant tumor of nerve sheath, 1 metastatic adenocarcinoma. We differentiated between the unspecific amplification and concluded that these are weak positive results. CONCLUSIONS: Genomic investigation may establish the tumor malignancy and its possible affiliation earlier than histopathology. It can support the screening of EWS/FLI-1 fusion in a larger variety of clinically diagnosed soft tissue tumors.
Asunto(s)
Proteínas de Fusión Oncogénica/metabolismo , Proteína Proto-Oncogénica c-fli-1/metabolismo , Proteína EWS de Unión a ARN/metabolismo , Sarcoma de Ewing/metabolismo , Neoplasias de los Tejidos Blandos/metabolismo , Adulto , Anciano , Femenino , Fluorescencia , Regulación Neoplásica de la Expresión Génica , Humanos , Masculino , Persona de Mediana Edad , Reacción en Cadena en Tiempo Real de la Polimerasa , Sarcoma de Ewing/genética , Neoplasias de los Tejidos Blandos/genéticaRESUMEN
OBJECTIVES: EWS/FLI-1 fusion mainly appears in Ewing's sarcoma or the primitive neuroectodermal tumors and represents a genomic marker for these tumors. However, it can appear with lower frequency in other soft tissue tumors. The paper investigates the presence of EWS/FLI-1 fusion in clinically diagnosed sarcoma belonging to different non-Ewing connective tissue tumors in order to search for a possible new biomarker valuable for investigators. METHODOLOGY: 20 patients with soft tissue tumors, who underwent surgery, were tested. Intra-operative samples of normal and tumor tissue were collected for histopathological diagnosis and genetics determinations. The patients' RNA from tumor and normal peritumoral tissue was extracted and EWS/FLI-1 fusion screened by quantitative real-time PCR. The relative expression of the fusion in the tumor sample was compared to the similar expression in normal tissue. RESULTS: The amplification in the threshold zone was shown by 5 samples (25%): 2 clear cell sarcoma, 1 fibrosarcoma, 1 malignant tumor of nerve sheath, 1 metastatic adenocarcinoma. We differentiated between the unspecific amplification and concluded that these are weak positive results. CONCLUSIONS: Genomic investigation may establish the tumor malignancy and its possible affiliation earlier than histopathology. It can support the screening of EWS/FLI-1 fusion in a larger variety of clinically diagnosed soft tissue tumors.