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Genomic structure and inducible expression of the IL-22 receptor α chain in mice

Abstract

IL-22 is a newly identified member of the interferon/IL-10 family. In humans, IL-22 signals through a heteroduplex receptor consisting of IL-22R and CRF2–4/IL-10Rβ. To investigate the physiological function of IL-22 and IL-22R, we isolated a cDNA encoding the mouse IL-22R, which has been a missing component of the functional receptor complex for mouse IL-22. Subsequently, we identified the genomic sequence of the mouse IL-22R gene by a database search. The gene consists of about 24 kb and is split into seven exons. Interestingly, intron 2 begins with a GC dinucleotide instead of the consensus GT, although otherwise the overall structure of the mouse IL-22R gene is strikingly similar to its human counterpart. The gene was mapped to mouse chromosome 4 in the region syntenic to the human IL-22R gene locus. In normal mice, IL-22R mRNA is detected at very low levels in restricted organs such as the kidney, liver, and lung. However, upon lipopolysaccharide stimulation, IL-22R mRNA expression is highly upregulated in the liver, in contrast to CRF2–4, which is expressed constitutively in a variety of tissues. Thus, the expression of the functional IL-22 receptor in the liver is regulated at the gene transcription level.

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Acknowledgements

We thank Ms I Hashitani for secretarial and technical assistance. This study was supported in part by the Special Coordination Funds for Promoting Science and Technology, and Grants-in-Aid for Scientific Research on Priority Areas (Diagnosis and Treatment of Cancer) from the Ministry of Education, Culture, Sports, Science and Technology of the Japanese Government.

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Correspondence to T Suda.

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Tachiiri, A., Imamura, R., Wang, Y. et al. Genomic structure and inducible expression of the IL-22 receptor α chain in mice. Genes Immun 4, 153–159 (2003). https://doi.org/10.1038/sj.gene.6363934

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