IL-13R alpha 2 membrane and soluble isoforms differ in humans and mice.
IL-13R alpha 2 membrane and soluble isoforms differ in humans and mice.
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DOI:
10.4049/jimmunol.0901028
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发表时间:
2009-12-15
期刊:
影响因子:
--
通讯作者:
Hershey GK
中科院分区:
文献类型:
--
作者:
Chen W;Sivaprasad U;Tabata Y;Gibson AM;Stier MT;Finkelman FD;Hershey GK
Although mice have ng/ml serum levels of soluble (s) IL-13Rα2, humans lack sIL-13Rα2 in serum. Our data provide a mechanism for this biologic divergence. In mice, discrete transcripts encoding s and membrane (mem) forms of IL-13Rα2 are generated by alternative splicing. We utilized siRNA to specifically deplete the transcript encoding memIL-13Rα2 (full-length) or sIL-13Rα2 (ΔEx10) in murine cells. Depletion of the full-length transcript decreased memIL-13Rα2, but had no effect on the level of sIL-13Rα2 in cell supernatants at baseline or following cytokine stimulation. Depletion of the ΔEx10 transcript decreased sIL-13Rα2 in supernatants at baseline and following stimulation. In contrast to mice, we were unable to find a transcript encoding sIL-13Rα2 in humans and siRNA-mediated depletion of full-length IL-13Rα2 decreased both sIL-13Rα2 and memIL-13Rα2 in human cells. Inhibition of matrix metalloproteinases (MMPs)/MMP-8 abolished production of sIL-13Rα2 from human cells. Thus, sIL-13Rα2 is derived exclusively from the memIL-13Rα2 transcript in humans through MMPs/MMP-8 cleavage of memIL-13Rα2, supporting a limited role for sIL-13Rα2 in humans and highlighting the potential importance of memIL-13Rα2 in human immunity. These observations require consideration when results of murine IL-13 studies are applied to humans.
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DOI:
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发表时间:
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影响因子:
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作者:
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影响因子:
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