Human Gene Set: MARTINEZ_TP53_TARGETS_DN

For the Mouse gene set with the same name, see MARTINEZ_TP53_TARGETS_DN

Standard name MARTINEZ_TP53_TARGETS_DN
Systematic name M8673
Brief description Genes down-regulated in mice with skin specific knockout of TP53 [GeneID=7157].
Full description or abstract Squamous cell carcinomas (SCC) represent the most aggressive type of nonmelanoma skin cancer. Although little is known about the causal alterations of SCCs, in organ-transplanted patients the E7 and E6 oncogenes of human papillomavirus, targeting the p53- and pRb-dependent pathways, have been widely involved. Here, we report the functional consequences of the simultaneous elimination of Trp53 and retinoblastoma (Rb) genes in epidermis using Cre-loxP system. Loss of p53, but not pRb, produces spontaneous tumor development, indicating that p53 is the predominant tumor suppressor acting in mouse epidermis. Although the simultaneous inactivation of pRb and p53 does not aggravate the phenotype observed in Rb-deficient epidermis in terms of proliferation and/or differentiation, spontaneous SCC development is severely accelerated in doubly deficient mice. The tumors are aggressive and undifferentiated and display a hair follicle origin. Detailed analysis indicates that the acceleration is mediated by premature activation of the epidermal growth factor receptor/Akt pathway, resulting in increased proliferation in normal and dysplastic hair follicles and augmented tumor angiogenesis. The molecular characteristics of this model provide valuable tools to understand epidermal tumor formation and may ultimately contribute to the development of therapies for the treatment of aggressive squamous cancer.
Collection C2: Curated
      CGP: Chemical and Genetic Perturbations
Source publication Pubmed 18245467   Authors: Martínez-Cruz AB,Santos M,Lara MF,Segrelles C,Ruiz S,Moral M,Lorz C,García-Escudero R,Paramio JM
Exact source Table 1S: pRb+/+;p53-/- vs. Control
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Source species Mus musculus
Contributed by Jessica Robertson (MSigDB Team)
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identifier namespace		 AFFY_Mouse430
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Version history 3.0: First introduced

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