Post-transcriptional regulation of P-glycoprotein expression in cancer cell lines

Angeles Gómez-Martínez, Pilar García-Morales, Alfredo Carrato, María D. Castro-Galache, José L. Soto, Estefanía Carrasco-García, Miriam García-Bautista, Patricia Guaraz, José A. Ferragut, Miguel Saceda

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

35 Citas (Scopus)

Resumen

The present study of inhibitors shows that the histone deacetylase-induced increase in P-glycoprotein (Pgp) mRNA (MDR1 mRNA) does not parallel either an increase in Pgp protein or an increase in Pgp activity in several colon carcinoma cell lines. Furthermore, studying the polysome profile distribution, we show a translational control of Pgp in these cell lines. In addition, we show that the MDR1 mRNA produced in these cell lines is shorter in its 5′ endthat the MDR1 mRNA produced in the MCF-7/Adr (human breast carcinoma) and K562/Adr (human erythroleukemia) cell lines, both of them expressing Pgp. The different size of the MDR1 mRNA is due to the use of alternative promoters. Our data suggest that the translational blockade of MDR1 mRNA in the colon carcinoma cell lines andin wild-type K562 cells couldbe overcome by alterations in the 5′ end of the MDR1 mRNA in the resistant variant of these cell lines, as in the case of the K562/Adr cell line. This is, to our knowledge, the first report demonstrating that the presence of an additional 5′ untranslated fragment in the MDR1 mRNA improves the translational efficiency of this mRNA.

Idioma originalInglés
Páginas (desde-hasta)641-653
Número de páginas13
PublicaciónMolecular Cancer Research
Volumen5
N.º6
DOI
EstadoPublicada - 1 jun 2007

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