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Endocrinology, Vol 137, 1159-1165, Copyright © 1996 by Endocrine Society

ARTICLES

Activation of the JAK-STAT signal transduction pathway by oncostatin-M cultured human and mouse osteoblastic cells

JB Levy, C Schindler, R Raz, DE Levy, R Baron and MC Horowitz
Department of Orthopaedics, Yale University School of Medicine, New Haven, Connecticut 06520-8071, USA.

Oncastatin M (OSM) is one member of the leukemia inhibitory factor/interleukin-6 family of cytokines that has been shown to be a growth regulatory molecule. In osteoblastic cultures, OSM causes marked phenotypic changes and the enhanced secretion of interleukin-6. In this study, we have shown that stimulation of murine and human osteoblastic cultures and a human osteosarcoma cell line with OSM resulted in the tyrosine phosphorylation of a number of cellular proteins including members of both the Janus kinase (JAK) and signal transducer and activator of transcription (STAT) family of signaling proteins. The JAKs, a family of intracellular kinases, and the STATs, a family of transcription factors, have both previously been shown to be tyrosine phosphorylated and activated in response to various cytokines, interferons, and growth factors in cells of non-skeletal origin. Using three different sources of cells of the osteoblast lineage, we demonstrate that OSM induces a rapid but transient tyrosine phosphorylation of the three JAK family members tested, JAK1, JAK2 and Tyk2. In addition, two members of the STAT family, Stat1alpha and Stat3, are tyrosine phosphorylated in osteoblastic cells in culture in response to OSM. OSM activation of this pathway in cells of the osteoblast lineage will result in the transcription of specific genes that ultimately may be associated with osteoblast function.


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