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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Interleukin-9 (IL-9) induces cell growth arrest associated with sustained signal transducer and activator of transcription activation in lymphoma cells overexpressing the IL-9 receptor.

Murine interleukin (IL)-9 inhibits apoptosis in murine T lymphomas via signal transducer and activator of transcription (STAT) factors. After transfection of the human IL-9 receptor, human IL-9 had a similar antiapoptotic activity, but, unlike the mouse protein, inhibited proliferation. This effect was correlated with the level of receptor expression and the extent of STAT phosphorylation. Expression of a moderate level of suppressor of cytokine signaling 3 ( SOCS3) reduced STAT activation by human IL-9 and prevented inhibition of growth but not of apoptosis. Using mutated IL-9 receptors, we showed that inhibition of proliferation was correlated with STAT1 and STAT3 activation by IL-9 and induction of the cell cycle inhibitor p19/ink4d, a STAT3 target gene. Activation of STAT1 by IFN-gamma did not result in cell growth arrest. In this model, cell growth inhibition is therefore associated with a higher number of receptors, a more robust STAT activation, and a greater sensitivity to SOCS3 expression, compared to apoptosis inhibition.[1]

References

  1. Interleukin-9 (IL-9) induces cell growth arrest associated with sustained signal transducer and activator of transcription activation in lymphoma cells overexpressing the IL-9 receptor. Demoulin, J.B., Van Snick, J., Renauld, J.C. Cell Growth Differ. (2001) [Pubmed]
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