title: Various p53 mutant proteins differently regulate the Ras circuit to induce a cancer-related gene signature.
abstract: Concomitant expression of mutant p53 and oncogenic Ras, leading to cellular transformation, is well documented. However, the mechanisms by which the various mutant p53 categories cooperate with Ras remain largely obscure. From this study we suggest that different mutant p53 categories cooperate with H-Ras in different ways to induce a unique expression pattern of a cancer-related gene signature (CGS). The DNA-contact p53 mutants (p53(R248Q) and p53(R273H)) exhibited the highest level of CGS expression by cooperating with NFκB. Furthermore, the Zn(+2) region conformational p53 mutants (p53(R175H) and p53(H179R)) induced the CGS by elevating H-Ras activity. This elevation in H-Ras activity stemmed from a perturbed function of the p53 transcription target gene, BTG2. By contrast, the L3 loop region conformational mutant (p53(G245S)) did not affect CGS expression. Our findings were further corroborated in human tumor-derived cell lines expressing Ras and the aforementioned mutated p53 proteins. These data might assist in future tailor-made therapy targeting the mutant p53-Ras axis in cancer.
authors.affiliation: Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.
authors.forename: Hilla
authors.initials: H
authors.lastname: Solomon
authors.forename: Yosef
authors.initials: Y
authors.lastname: Buganim
authors.forename: Ira
authors.initials: I
authors.lastname: Kogan-Sakin
authors.forename: Leslie
authors.initials: L
authors.lastname: Pomeraniec
authors.forename: Yael
authors.initials: Y
authors.lastname: Assia
authors.forename: Shalom
authors.initials: S
authors.lastname: Madar
authors.forename: Ido
authors.initials: I
authors.lastname: Goldstein
authors.forename: Ran
authors.initials: R
authors.lastname: Brosh
authors.forename: Eyal
authors.initials: E
authors.lastname: Kalo
authors.forename: Tsevi
authors.initials: T
authors.lastname: Beatus
authors.forename: Naomi
authors.initials: N
authors.lastname: Goldfinger
authors.forename: Varda
authors.initials: V
authors.lastname: Rotter
mesh_terms: D045744:Cell Line, Tumor; D002471:Cell Transformation, Neoplastic / Q000235:genetics / Q000378:metabolism; D054360:Chemokine CXCL1 / Q000235:genetics / Q000378:metabolism; D004789:Enzyme Activation; D015971:Gene Expression Regulation, Enzymologic; D015972:Gene Expression Regulation, Neoplastic; D011905:Genes, ras; D006801:Humans; D017874:Immediate-Early Proteins / Q000235:genetics / Q000378:metabolism; D009154:Mutation; D016328:NF-kappa B / Q000235:genetics / Q000378:metabolism; D025941:Protein Interaction Mapping; D014158:Transcription, Genetic; D059467:Transcriptome; D014162:Transfection; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism; D015032:Zinc / Q000378:metabolism
chemical_list: C475829:CXCL1 protein, human; D054360:Chemokine CXCL1; D017874:Immediate-Early Proteins; D016328:NF-kappa B; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; C070114:BTG2 protein, human; D015032:Zinc