期刊
GENES AND IMMUNITY
卷 1, 期 7, 页码 442-450出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.gene.6363714
关键词
interleukin-10; interleukin-19; homologue; expression; monocyte; chromosome one; cloning
资金
- NCI NIH HHS [R01-CA46465, 1P30-CA72720] Funding Source: Medline
- NIAID NIH HHS [R01 AI36450, R01 AI43369] Funding Source: Medline
Interleukin-10 (IL-10) is a pleiotropic cytokine with important immunoregulatory functions whose actions influence activities of many of the cell-types in the immune system. We report here identification and cloning of a gene and corresponding cDNAs encoding a novel homologue of IL-IO, designated IL-19. IL-19 shares 21% amino acid identity with IL-10. The exon/intron structure of IL-19 is similar to that of the human IL-IO gene, comprising five exons and four introns within the coding region of the IL-19 cDNA. There are at least two distinct IL-19 mRNA species that differ in their 5'-sequences, suggesting the existence of an intron in the 5'-sequences of coding portion of the IL-19 gene. The longer 5'-sequence contains an alternative initiating ATG codon that is in-frame with the rest of the coding sequence. The expression of IL-19 mRNA can be induced in monocytes by LPS-treatment. The appearance of IL-19 mRNA in LPS-stimulated monocytes was slightly delayed compared to expression of IL-10 mRNA: significant levels of IL-10 mRNA were detectable at 2 h post-stimulation, whereas IL-19 mRNA was not detectable until 4 h. Treatment of monocytes with IL-4 or IL-13 did not induce de novo expression of IL-19, but these cytokines did potentiate IL-19 gene expression in LPS-stimulated monocytes. In addition, GM-CSF was capable of directly inducing IL-19 gene expression in monocytes. IL-19 does nor bind or signal through the canonical IL-10 receptor complex, suggesting existence of an IL-19 specific receptor complex, the identity of which remains to be discovered.
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