Murine IL-4 is able to signal via chimeric human IL-4Rα/mouse γ-chain receptor

Murine IL-4 is able to signal via chimeric human IL-4Rα/mouse γ-chain receptor
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DOI:
10.1016/j.molimm.2007.09.009
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发表时间:
2008-03-01
影响因子:
3.6
通讯作者:
Brombacher, Frank
Brombacher, Frank
中科院分区:
医学3区
文献类型:
--
作者:
Myburgh, Elmarie;Horsnell, William G. C.;Brombacher, Frank

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Human IL-4R alpha binds to mouse gamma c resulting in a chimeric receptor specific for human IL-4 but not mouse IL-4, providing in principle an inducible hIL-4 system. We investigated the in vitro and in vivo characteristics of human IL-4R alpha transgenic mice on a mouse IL-4R alpha-deficient background (hIL-4R alpha Tg/mIL-4R alpha(-/-)). The integrity of lymphocyte-specific hIL-4R alpha expression in hIL-4R alpha Tg/mIL-4R alpha(-/-) mice was demonstrated by FACS analysis. This was confirmed in functional studies as lymphocytes responded to recombinant hIL-4 but not mIL-4 or mIL-13 in proliferation and T helper differentiation assays, demonstrating species-specificity and inducibility of the chimeric receptor in vitro. We then infected transgenic mice with Nippostrongylus brasiliensis, known to induce a strong Type 2 response in wild-type mice. As expected hIL-4R alpha Tg/mIL-4R alpha(-/-) mice were unable to expel N. brasiliensis worms which confirms unresponsiveness in non-lymphocytes. However they developed a Th2 cytokine and IgE response in the absence of induction with hIL-4. These results suggested that lymphocyte-specific IL-4R alpha responsiveness was still present in vivo. Neutralization of endogenous mIL-4 resulted in inhibition of N. brasiliensis-induced Th2 cytokine and total IgE production in hIL-4R alpha Tg/mIL4R alpha(-/-) mice suggesting that mIL-4 was involved. Intercrossing hIL-4R alpha Tg/mIL-4R alpha(-/-) mice with mIL-4(-/-)/mIL-13(-/-) mice completely abrogated Type 2 responses in N. brasiliensis infections. Together, these data demonstrate that mIL-4 triggered the hIL-4R alpha/m gamma c chimeric receptor in vivo. (c) 2007 Elsevier Ltd. All rights reserved.