The role of c-Jun and c-Fos expression in androgen-independent prostate cancer

The Journal of Pathology
J EdwardsJ M S Bartlett

Abstract

Molecular mechanisms underlying the development of androgen-insensitive prostate cancer (AIPC) are poorly understood. However, there is growing evidence that different molecular profiles may result in the development of AIPC. Cell line studies demonstrate that c-Jun and c-Fos, via formation of the transcription factor activated protein 1 (AP-1), activate androgen-regulated genes independent of androgens and that c-Jun alone acts as an androgen receptor co-factor. The aim of this study was to investigate whether increased levels of c-Jun and phosphorylated c-Jun are associated with the development of AIPC using clinical material. Material from a cohort of 51 patients with paired tumours, obtained before and after the development of AIPC, and with full clinical biochemical follow-up, was retrieved from the archives. Tumour c-Jun, activated c-Jun, c-Fos, and pan protein kinase C (PKC) protein expression were analysed by immunohistochemistry and protein expression was scored by two independent observers using a weighted histoscore. No evidence was found to suggest that c-Jun acting as an androgen receptor co-factor influences the development of AIPC. However, it was observed that patients with high expression levels of phosphorylat...Continue Reading

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