Oncostatin M induces association of Grb2 with Janus kinase JAK2 in multiple myeloma cells

doi:10.1084/jem.182.6.1801

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Oncostatin M induces association of Grb2 with Janus kinase JAK2 in multiple myeloma cells

D Chauhan, SM Kharbanda, A Ogata, M Urashima, D Frank, N Malik, DW Kufe and KC Anderson
Division of Hematologic Malignancies, Dana Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.

Oncostatin M (OSM) is a 28-kD glycoprotein recently identified as a growth factor for human multiple myeloma cells. It belongs to a family of distantly related cytokines that includes interleukin 6, ciliary neurotrophic factor, leukemia-inhibitory factor, and interleukin 11. These cytokines initiate signaling by inducing either homodimerization of gp130 or heterodimerization of gp130 with leukemia-inhibitory factor receptor beta components. Such dimerization in turn activates receptor- associated tyrosine kinases. In the present study using U266B1 human multiple myeloma cells, we show that OSM induces tyrosine phosphorylation and activation of JAK2, but not JAK1 or Tyk2, kinases. The results also demonstrate that OSM induces direct interaction of JAK2 kinase with Grb2, an SH2/SH3 domain containing adaptor protein. The SH2 domain of Grb2 is directly associated with tyrosine- phosphorylated JAK2. Furthermore, the presence of Sos in the JAK2-Grb2 complex suggests a role for Ras in OSM-transduced signaling.
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