Schuierer, Marion M. and Bataille, Frauke and Hagan, Suzanne and Kolch, Walter and Bosserhoff, Anja-Katrin (2004) Reduction in Raf kinase inhibitor protein expression is associated with increased Ras-extracellular signal-regulated kinase signaling in melanoma cell lines. CANCER RESEARCH, 64 (15). pp. 5186-5192. ISSN 0008-5472, 1538-7445
Full text not available from this repository. (Request a copy)Abstract
Mutations in the Raf signaling pathway are known to play a pivotal role in the progression of malignant melanoma. In this study, we provide evidence that the Raf-1 kinase inhibitory protein (RKIP) and its effects on Raf-1-mediated activation of mitogen-activated protein/extracellular signal-regulated kinase kinase are important for the metastatic potential of malignant melanoma. Screening nine melanoma cell lines at mRNA and protein levels, we detected significant down-regulation of RKIP expression in comparison with normal melanocytes. Loss of RKIP expression in transformed cells in vivo was confirmed in immunohistochemical analyses demonstrating reduction of RKIP expression already in primary melanoma and even stronger down-regulation or complete loss in melanoma metastases. Stable transfection of the melanoma cell line Mel Im with an RKIP expression plasmid blocked the Raf kinase pathway, resulting in down-regulation of extracellular signal-regulated kinase 1/2 and activator protein 1 activity. In very good agreement with the in vivo finding that down-regulation of RKIP expression is most obvious in melanoma metastasis, overexpression of RKIP in the highly invasive Mel Im cell line leads to a significant inhibition of invasiveness in vitro. Taken together, our results suggest that loss of RKIP in malignant melanoma contributes to enhanced invasiveness of transformed cells and therefore to progression of the disease.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MALIGNANT-MELANOMA; CUTANEOUS MELANOMA; BRAF MUTATIONS; ACTIVATION; TRANSFORMATION; SUPPRESSION; PATHWAY; PROGRESSION; METASTASIS; INVASION; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Pathologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Jul 2021 09:50 |
| Last Modified: | 05 Jul 2021 09:50 |
| URI: | https://pred.uni-regensburg.de/id/eprint/37368 |
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