Dudley AC, Shih SC, Cliffe AR, Hida K, Klagsbrun M.. Attenuated p53 activation in tumour-associated stromal cells accompanies decreased sensitivity to etoposide and vincristine. Br J Cancer 99: 118-125

Vascular Biology Program, Department of Surgery, Children's Hospital and Harvard Medical School, Boston, MA 02115, USA.
British Journal of Cancer (Impact Factor: 4.84). 08/2008; 99(1):118-25. DOI: 10.1038/sj.bjc.6604465
Source: PubMed


Alterations in the tumour suppressor p53 have been reported in tumour-associated stromal cells; however, the consequence of these alterations has not been elucidated. We investigated p53 status and responses to p53-activating drugs using tumour-associated stromal cells from A375 melanoma and PC3 prostate carcinoma xenografts, and a spontaneous prostate tumour model (TRAMP). p53 accumulation after treatment with different p53-activating drugs was diminished in tumour-associated stromal cells compared to normal stromal cells. Tumour-associated stromal cells were also less sensitive to p53-activating drugs - this effect could be reproduced in normal stromal cells by p53 knockdown. Unlike normal stromal cells, tumour stromal cells failed to arrest in G(2) after etoposide treatment, failed to upregulate p53-inducible genes, and failed to undergo apoptosis after treatment with vincristine. The lower levels of p53 in tumour stromal cells accompanied abnormal karyotypes and multiple centrosomes. Impaired p53 function in tumour stroma might be related to genomic instability and could enable stromal cell survival in the destabilising tumour microenvironment.

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Available from: K. Hida, Apr 26, 2014
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    • "CAFs are large, spindle-shaped mesenchymal cells that share characteristics with smooth muscle cells and fibroblasts [6]. They constitute a significant component of the stroma and represent the cells responsible for the change of extracellular matrix composition into one with increased amounts of collagens (desmoplastic response) [3]. Currently, no precise definition of CAFs exists because of the different cellular origin and markers expressed: CAFs are likely to derive from resident fibroblasts and marrow-derived mesenchymal precursor cells, whereas their generation through epithelial-mesenchymal transition (EMT) of tumor cells is more controversial [6,9,10]. "
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