Reference : Constitutive suppressor of cytokine signaling 3 expression confers a growth advantage...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
Constitutive suppressor of cytokine signaling 3 expression confers a growth advantage to a human melanoma cell line
Komyod, W. [> >]
Böhm, M. [> >]
Metze, D. [> >]
Heinrich, P. C. [> >]
Behrmann, Iris mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit >]
Molecular Cancer Research
American Association for Cancer Research, Inc. (AACR)
Yes (verified by ORBilu)
[en] Suppressor of Cytokine Signaling Proteins ; Cell Line, Tumor ; Cytokines ; Drug Resistance, Neoplasm ; Humans ; Interleukin-6 ; Melanoma ; Oncostatin M ; RNA, Messenger ; Skin Neoplasms ; Antineoplastic Agents
[en] The growth of melanocytes and many early stage melanoma cells can be inhibited by cytokines, whereas late stage melanoma cells have often been reported to be "multi-cytokine-resistant." Here, we analyzed the melanoma cell line 1286, resistant towards the growth-inhibitory effects of interleukin 6 (IL-6), and oncostatin M (OSM), to better understand the mechanisms underlying cytokine resistance. Although the relevant receptors gp130 and OSMR are expressed at the cell surface of these cells, cytokine stimulation hardly led to the activation of Janus kinase 1 and signal transducer and activator of transcription (STAT)3 and STAT1. We found a high-level constitutive expression of suppressors of cytokine signaling 3 (SOCS3) that did not further increase after cytokine treatment. Importantly, upon suppression of SOCS3 by short interfering RNA, cells became susceptible towards OSM and IL-6: they showed an enhanced STAT3 phosphorylation and a dramatically increased STAT1 phosphorylation. Moreover, suppression of SOCS3 rendered 1286 cells sensitive to the antiproliferative action of IL-6 and OSM, but not of IFN-alpha. Interestingly, SOCS3-short interfering RNA treatment also increased the growth-inhibitory effect in cytokine-sensitive WM239 cells expressing SOCS3 in an inducible way. Thus, SOCS3 expression confers a growth advantage to these cell lines. Constitutive SOCS3 mRNA expression, although at lower levels than in 1286 cells, was found in nine additional human melanoma cell lines and in normal human melanocytes, although at the protein level, SOCS3 expression was marginal at best. However, in situ analysis of human melanoma specimens revealed SOCS3 immunoreactivity in 3 out of 10 samples, suggesting that in vivo SOCS3 may possibly play a role in IL-6 resistance in at least a fraction of tumors.

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