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Kozawa, O. et al.

Kozawa, Otsuka, Uematsu,

Leukemia inhibitory factor enhances bFGF- induced IL-6 synthesis in osteoblasts: involvement of JAK2/STAT3.

We previously showed that basic fibroblast growth factor (bFGF) stimulates release of vascular endothelial growth factor (VEGF) and synthesis of interleukin-6 (IL-6) in osteoblast-like MC3T3-E1 cells. In the present study, we investigated the effects of leukemia inhibitory factor (LIF) on the release of VEGF and IL-6 in these cells. LIF did not affect the bFGF-stimulated VEGF release. On the contrary, LIF, which alone had little effect on IL-6 release, significantly enhanced the bFGF- stimulated IL-6 release. The amplifying effect of LIF on the IL-6 release was dose dependent in the range between 0.01 and 10 ng/ml. AG490, an inhibitor of JAK2, suppressed the amplifying effect of LIF. LIF induced the phosphorylation of STAT3. AG490 inhibited the LIF-induced STAT3 phosphorylation. Taken together, our results strongly suggest that LIF enhances bFGF- stimulated IL-6 synthesis via JAK2/STAT3 pathway in osteoblasts.[1]

References

Leukemia inhibitory factor enhances bFGF-induced IL-6 synthesis in osteoblasts: involvement of JAK2/STAT3. Kozawa, O., Otsuka, T., Uematsu, T. Cell. Signal. (2002) [Pubmed]

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