Cloning, expression and initial characterisation of interleukin-19 (IL-19), a novel homologue of human interleukin-10 (IL-10)

G. Gallagher, H. Dickensheets, J. Eskdale, L. S. Izotova, O. V. Mirochnitchenko, J. D. Peat, N. Vazquez, S. Pestka, R. P. Donnelly, S. V. Kotenko

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250 Scopus citations

Abstract

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-10, 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-10 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 not 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.

Original languageEnglish (US)
Pages (from-to)442-450
Number of pages9
JournalGenes and Immunity
Volume1
Issue number7
DOIs
StatePublished - Oct 2000

All Science Journal Classification (ASJC) codes

  • Genetics(clinical)
  • Genetics
  • Immunology

Keywords

  • Chromosome one
  • Cloning
  • Expression
  • Homologue
  • Interleukin-10
  • Interleukin-19
  • Monocyte

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