alexa JAK2 tyrosine kinase inhibitor tyrphostin AG490 downregulates the mitogen-activated protein kinase (MAPK) and signal transducer and activator of transcription (STAT) pathways and induces apoptosis in myeloma cells.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Stem Cell Research & Therapy

Author(s): De Vos J, Jourdan M, Tarte K, Jasmin C, Klein B

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Abstract Cytokines of the interleukin 6 (IL-6) family, which activates the signal transducer gp130, are major survival and growth factors for human multiple myeloma (MM) cells. The signal transduction of gp130 involves the Janus tyrosine kinases (JAK) JAK1, JAK2 and Tyk2 and then the downstream effectors comprising the signal transducer and activator of transcription 3 (STAT3) and mitogen-activated protein kinase (MAPK) pathways. We evaluated the effects of the JAK2 inhibitor tyrphostin AG490 on MM cells. We found that AG490 suppressed cell proliferation and induced apoptosis in IL-6-dependent MM cell lines. JAK2 kinase activity, ERK2 and STAT3 phosphorylation were inhibited. These results suggest that the chemical blocking of the gp130 signalling pathway at the JAK level could be a relevant therapeutic approach to MM.
This article was published in Br J Haematol and referenced in Journal of Stem Cell Research & Therapy

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