p8 is critical for tumour development induced by rasV12 mutated protein and E1A oncogene.
The p8 protein is involved in the cellular stress response of many tissues. Because p8 is overexpressed in many cancers, we investigated whether its expression was required for tumour development. Mouse embryo fibroblasts (MEFs) from p8+/+ and p8-/- animals were transformed with the pBabe-rasV12/E1A retroviral vector, which expresses both the rasV12 mutated protein and the E1A oncogene. As expected, transformed p8+/+ MEFs could form colonies in soft agar. However, transformed p8-/- MEFs could not. In addition, subcutaneous or intraperitoneal injections of transformed p8+/+ MEFs always led to tumour formation in nude mice, but, again, no tumour was observed with transformed p8-/- MEFs. However, restoring p8 expression in transformed p8-/- MEFs before injection led to tumour formation. In the tumours, p8 expression was induced during tumour development. It was concluded that p8 expression in transformed MEFs is necessary for tumour formation, suggesting that the stress-response mechanisms governed by p8 are required for tumour establishment.
Vasseur
Sophie
S
Centre de Recherche INSERM, EMI 0116, 163 avenue de Luminy, Campus de Luminy, BP 172, F-13009 Marseille, France.
Hoffmeister
Albrecht
A
Garcia
Stephane
S
Bagnis
Claude
C
Dagorn
Jean-Charles
JC
Iovanna
Juan Lucio
JL
D017500:Adenovirus E1A Proteins / Q000235:genetics*; D000818:Animals; D002471:Cell Transformation, Neoplastic / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics*; D015972:Gene Expression Regulation, Neoplastic; D006133:Growth Substances / Q000235:genetics*; D051379:Mice; D008819:Mice, Nude; D009154:Mutation; D009363:Neoplasm Proteins; D009374:Neoplasms, Experimental / Q000209:etiology / Q000235:genetics*; D018631:ras Proteins / Q000235:genetics*
D017500:Adenovirus E1A Proteins; D004268:DNA-Binding Proteins; D006133:Growth Substances; D009363:Neoplasm Proteins; C491644:Nupr1 protein, mouse; D018631:ras Proteins