Abstract
Interleukin 13–deficient (IL-13−/−) mice express a defect in priming for IL-4 production that is not corrected by adding IL-13 to the priming culture. This is partly accounted for by the consumption of IL-4 without endogenous replacement during culture of IL-13−/− CD4+ T cells. We examined cells from mice in which disrupted Il13 was linked to wild-type Il4 on one chromosome and wild-type Il13 was linked to a “knocked-in” green fluorescent protein (Gfp) gene in the Il4 locus. Our results show that the deficit in IL-4 production was due, at least in part, to a cis effect, in which disrupted Il13 diminished IL-4 production from the linked Il4 gene.
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We thank Shirley Starnes for editorial assistance.
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Web Figure 1.
IL-13-/-cells produce less IL-4 than wild-type cells. Lymph node CD4 T cells (105/ml) were cultured with irradiated APCs (106/ml) in anti-CD3, anti-CD28 and IL-2 in the presence of IL-4 (500 pg/ml), anti–IL-12 an IFN-γ. IL-4 concentration in supernatant fluid at days 2 and 4 was bioassayed. (GIF 11 kb)
Web Figure 2.
Disruption of Il13 has little effect on RAD50. Lymph node CD4 T cells from IL-13-/- or BALB/c mice were purified and primed under TH1 and TH2 conditions. RAD50 mRNA levels were examined by RT-PCR using twofold dilutions of "input" RNA. (JPG 18 kb)
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Guo, L., Hu-Li, J., Zhu, J. et al. Disrupting Il13 impairs production of IL-4 specified by the linked allele. Nat Immunol 2, 461–466 (2001). https://doi.org/10.1038/87778
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DOI: https://doi.org/10.1038/87778