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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1995 Mar 28;92(7):2800–2804. doi: 10.1073/pnas.92.7.2800

Molecular identification of porcine interleukin 10: regulation of expression in a kidney allograft model.

G Blancho 1, P Gianello 1, S Germana 1, M Baetscher 1, D H Sachs 1, C LeGuern 1
PMCID: PMC42306  PMID: 7708727

Abstract

Clones encoding porcine interleukin 10 (IL-10) were isolated from a cDNA library produced from phytohemagglutinin-activated pig peripheral blood mononuclear cells. The porcine IL-10 nucleotide sequence was found to be highly homologous to the rat, mouse, and human IL-10 counterparts and to one of the open reading frames from the Epstein-Barr virus. In addition, pig IL-10 caused inhibition of gamma-interferon gene transcription as determined by a bioassay. To investigate the possible immunomodulatory role of IL-10, its expression during the induction of tolerance to kidney allografts by cyclosporin A in miniature swine was also investigated. Delayed expression and higher levels of IL-10 were observed in tolerant animals compared with animals rejecting their allografts. Since tolerance is achieved by a short course of cyclosporin A, we have also studied the in vitro effect of this drug on IL-10 gene transcription in blood mononuclear cells and have found that cyclosporin A inhibits IL-10 gene activation in T cells but does not interfere with IL-10 transcription in lipopolysaccharide-activated cells. These results suggest that the overexpression of IL-10, observed in cell populations infiltrating grafts from tolerant animals, may be a function of monocytes and/or B cells.

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Selected References

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