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Título: Cisplatin induced gamma-glutamyltransferase up-regulation, hypertrophy and differentiation in astrocytic glioma cells in culture
Fecha de publicación: 2003
Editorial: Murcia : F. Hernández
ISSN: 0213-3911
Materias relacionadas: CDU::5 - Ciencias puras y naturales::57 - Biología::576 - Biología celular y subcelular. Citología
Palabras clave: Cisplatin
Cellular stress
Resumen: Gamma-glutamyltransferase (GGT) hydrolyses gamma-glutamylated peptides, including glutathione and transports amino acids into the cells. The enzyme is up-regulated in some tumors, especially those with a higher degree of malignancy and resistance to cytostatics. In this study we examined the effects of Cisplatin (1.6 x 10-5M) on the activity of GGT in astrocytic C6 glioma cells in cultures monitored for growth, morphology and differentiation. Initially (24 h), the drug inhibited cell division and later (96 h), it caused apoptotic death of about half of the population. The more resistant and surviving cells became hypertrophic and more differentiated, as indicated by their larger size and higher protein content, including the maturationspecific GFAP. In addition, the activity of GGT was significantly elevated in these cells at 48 h and onwards. At 96 h, the biochemically determined enzyme activity was between 230% and 330% above the controls. Compared to the protein content, the GGT activity started to increase later (48 h) but it grew steeper towards 72-96 h. Similarly, histochemical analysis revealed a manifold increase in the number of GGT+ cells in the population and higher intensity of staining per cell from at 48 h and onwards. The study showed that the transformed astrocytic cells can up-regulate GGT activity as part of an adaptation and/or, survivalenhancing reaction triggered by Cisplatin.
Autor/es principal/es: Mares, V.
Lisá, V.
Malík, R.
Kozáková, H.
Sedo, A.
Forma parte de: Histology and histopathology
URI: http://hdl.handle.net/10201/21458
Tipo de documento: info:eu-repo/semantics/article
Número páginas / Extensión: 7
Derechos: info:eu-repo/semantics/openAccess
Aparece en las colecciones:Vol.18, nº 3 (2003)

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