Inhibition of IL-6-dependent growth of myeloma cells by an acidic peptide repressing the gp130-mediated activation of Src family kinases
| Autor: | Axel Obermeier, C Miksch, Olga Mitina, Günter Krause, J Ellwart, R Tavares, Michael Hallek, A Hausherr, M Schäffer |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
STAT3 Transcription Factor
Cancer Research medicine.medical_treatment Molecular Sequence Data Apoptosis Peptide Biology Cell Line Mice FYN LYN Cell Line Tumor Cytokine Receptor gp130 Genetics medicine Animals Humans Amino Acid Sequence Src family kinase Molecular Biology Cell Proliferation chemistry.chemical_classification Tyrosine-protein kinase CSK Interleukin-6 Kinase Cell Cycle Biological Transport myeloma interleukin-6 signalling gp130 membrane-permeant peptide Src family kinases Peptide Fragments Cell biology src-Family Kinases Cytokine chemistry Proto-Oncogene Proteins c-hck Cancer research Multiple Myeloma Proto-oncogene tyrosine-protein kinase Src |
| Zdroj: | Oncogene 26, 4987-4998 (2007) |
| ISSN: | 1476-5594 0950-9232 |
| Popis: | An acidic domain (AD) of gp130 was previously found to interact with the Src family kinase (SFK) Hck. Here, the influence of myristoylated peptides derived from this AD was assessed in the mouse myeloma cell line, 7TD1. The IL-6-dependent growth of 7TD1 cells was reduced by approximately 75%, if 100 microM of myristoylated 18mer peptide (18AD) was included in the growth medium, but was unaffected by a control peptide with scrambled sequence (18sc). A similar differential inhibition by peptides 18AD and 18sc was observed for the erythropoietin-dependent growth of BaF-EH cells expressing chimeric erythropoietin receptor-gp130 and human Hck and for the human myeloma cell line INA-6. While the peptide 18AD concentration inhibiting 50% was approximately 30 microM in 7TD1 and BaF-EH cells, peptide 18AD did not significantly inhibit growth of IL-6-independent MM1.S myeloma and OKT1 hybridoma cells or of BaF-EH cells supplied with IL-3. Treatment with 100 microM peptide 18AD caused the same degree or 60% of apoptosis induction as IL-6 deprivation in 7TD1 or INA-6 cells, respectively. Co-immunoprecipitation experiments revealed that peptide 18AD interfered with the association of Hck and gp130 in 7TD1 lysates in a concentration-dependent manner. IL-6-treatment of INA-6 cells induced the kinase activities of Fyn, Lyn and Hck, but not Src, and the IL-6-induced SFK activities were inhibited by peptide 18AD. Expression in 7TD1 cells of a kinase-inactive Hck mutant (K269R) elicited a dominant-negative effect on cell number increases providing further evidence that SFKs are required for gp130 signalling in myeloma cells. |
| Databáze: | OpenAIRE |
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