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

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Hültner, L. et al.

Hültner, Kölsch, Stassen, Kaspers, Kremer, Mailhammer, Moeller, Broszeit, Schmitt,

In activated mast cells, IL-1 up-regulates the production of several Th2-related cytokines including IL-9.

Mast cells can play detrimental roles in the pathophysiology and mortality observed in anaphylaxis and other Th2-dominated allergic diseases. In contrast, these cells contribute to protective host defense mechanisms against parasitic worm infections. After IgE/Ag activation, mast cells can produce multiple cytokines that may enhance allergic inflammations, while a similar panel of Th2-related cytokines may support immunological strategies against parasites. Here we report that in primary mouse bone marrow-derived mast cells activated by ionomycin or IgE/Ag, the proinflammatory mediator IL-1 (alpha or beta) up-regulated production of IL-3, IL-5, IL-6, and IL-9 as well as TNF, i.e., cytokines implicated in many inflammatory processes including those associated with allergies and helminthic infections. IL-1 did not induce significant cytokine release in the absence of ionomycin or IgE/Ag, suggesting that Ca-dependent signaling was required. IL-1-mediated enhancement of cytokine expression was confirmed at the mRNA level by Northern blot and/or RT-PCR analysis. Our study reveals a role for IL-1 in the up-regulation of multiple mast cell-derived cytokines. Moreover, we identify mast cells as a novel source of IL-9. These results are of particular importance in the light of recent reports that strongly support a central role of IL-9 in allergic lung inflammation and in host defense against worm infections.[1]

References

In activated mast cells, IL-1 up-regulates the production of several Th2-related cytokines including IL-9. Hültner, L., Kölsch, S., Stassen, M., Kaspers, U., Kremer, J.P., Mailhammer, R., Moeller, J., Broszeit, H., Schmitt, E. J. Immunol. (2000) [Pubmed]

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