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Cancer Gene Ther ; 16(10): 753-63, 2009 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-19363467

RESUMEN

We have earlier described the oncolytic adenovirus vector dl520 that was rendered cancer-specific by deletion of the transactivation domain CR3 of the adenoviral E1A13S protein; this deletion causes antitumor activity in drug-resistant cells displaying nuclear YB-1 expression. We hypothesized that the anticancer activity of dl520 could be further improved by introducing the RGD motif in the fiber knob and by deletion of the adenoviral E1B19K protein (Ad-Delo3-RGD). In this study, the in vitro and in vivo antitumor activity of Ad-Delo3-RGD was investigated focussing on two pancreatic cancer cell lines MiaPaCa-2 and BxPC3 alone and in combination with cytotoxic drugs. Furthermore, luciferin-based bioluminescence imaging was established to study the therapeutic response in vivo. In addition, to confirm the specificity of Ad-Delo3-RGD for YB-1 a tetracycline-inducible anti-YB-1 shRNA-expressing cell variant EPG85-257RDB/tetR/YB-1 was used. This TetON regulatable expression system allows us to measure adenoviral replication by real-time PCR in the absence of YB-1 expression. The results confirmed the YB-1 dependency of Ad-Delo3-RGD and showed that Ad-Delo3-RGD has potent activity against human pancreatic cancer cells in vitro and in vivo, which was augmented by the addition of paclitaxel. However, although high replication capacity was measured in vitro and in vivo, complete tumor regression was not achieved, indicating the need for further improvements to treat pancreatic cancer effectively.


Asunto(s)
Adenoviridae/fisiología , Proteínas de Unión al ADN/biosíntesis , Proteínas Nucleares/biosíntesis , Viroterapia Oncolítica/métodos , Neoplasias Pancreáticas/terapia , Neoplasias Pancreáticas/virología , Adenoviridae/genética , Adenoviridae/metabolismo , Animales , Línea Celular Tumoral , Terapia Combinada , Proteínas de Unión al ADN/genética , Vectores Genéticos/genética , Células HeLa , Humanos , Inmunohistoquímica , Ratones , Ratones Endogámicos BALB C , Ratones Desnudos , Proteínas Nucleares/genética , Paclitaxel/farmacología , Neoplasias Pancreáticas/metabolismo , Neoplasias Pancreáticas/patología , Regiones Promotoras Genéticas , ARN Interferente Pequeño/genética , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Transfección , Replicación Viral/efectos de los fármacos , Ensayos Antitumor por Modelo de Xenoinjerto , Proteína 1 de Unión a la Caja Y
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