Potential prognostic molecular signatures in a preclinical model of melanoma

Abstract

Numerous studies have revealed a variety of pathways involved in the development of melanoma, however, the molecular and genetic divergence of underlying mechanisms remain vague. In a mouse model, we studied the expression pattern of insulin-like growth factor 2 mRNAbinding protein 1 (Igf2bp1) and target genes microphthalmiaassociated transcription factor (Mitf), v-myc avian myelocytomatosis viral oncogene homolog (Myc), B-cell lymphoma 2 (Bcl2), prothymosin alpha (Ptma) and melan-A (Mlana) in relation to tumor-growth characteristics. The in vivo expression of the aforementioned genes was assessed by quantitative Real Time-Polymerase Chain Reaction (RT-PCR) in tumors established by B16-F1-derived clones. Gene expression was correlated with tumor growth characteristics. Simultaneous expression of elevated levels of Myc, Igf2bp1, Ptma and Mitf characterizes tumors with a more aggressive phenotype. Our findings introduce a tumor-specific molecular signature possibly associated with melanoma heterogeneity. The concomitant overexpression of key molecules such as IGF2BP1, PTMA, MYC and MITF could serve as prognostic or predictive marker.