Enhanced CRAd activity using enhancer motifs driven by a nucleosome positioning sequence

Soraya Bravo, Felipe Núñez, Fernando Cruzat, Eduardo G. Cafferata, Giancarlo V. De Ferrari, Martín Montecino, Osvaldo L. Podhajcer

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

2 Citas (Scopus)

Resumen

Cancer development involves changes driven by the epigenetic machinery, including nucleosome positioning. Recently, the concept that adenoviral replication may be driven by tumor specific promoters (TSPs) gained support, and several conditionally replicative adenoviruses (CRAd) exhibited therapeutic efficacy in clinical trials. Here, we show for the first time that placing a nucleosome positioning sequence (NPS) upstream of a TSP combined with Wnt-responsive motifs (pART enhancer) enhanced the TSP transcriptional activity and increased the lytic activity of a CRAd. pART enhanced the transcriptional activity of the gastrointestinal cancer (GIC)-specific REG1A promoter (REG1A-pr); moreover, pART also increased the in vitro lytic activity of a CRAd whose replication was driven by REG1A-Pr. The pART enhancer effect in vitro and in vivo was strictly dependent on the presence of the NPS. Indeed, deletion of the NPS was strongly deleterious for the in vivo antitumor efficacy of the CRAd on orthotopically established pancreatic xenografts. pART also enhanced the specific activity of other heterologous promoters; moreover, the NPS was also able to enhance the responsiveness of hypoxia- and NFκB-response elements. We conclude that NPS could be useful for gene therapy approaches in cancer as well as other diseases.

Idioma originalInglés
Páginas (desde-hasta)1403-1412
Número de páginas10
PublicaciónMolecular Therapy
Volumen21
N.º7
DOI
EstadoPublicada - jul. 2013

Áreas temáticas de ASJC Scopus

  • Medicina molecular
  • Biología molecular
  • Genética
  • Farmacología
  • Descubrimiento de medicamentos

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