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. 1992 Aug 15;89(16):7752–7756. doi: 10.1073/pnas.89.16.7752

Interleukin 1 regulates secretion of zinc-thymulin by human thymic epithelial cells and its action on T-lymphocyte proliferation and nuclear protein kinase C.

J A Coto 1, E M Hadden 1, M Sauro 1, N Zorn 1, J W Hadden 1
PMCID: PMC49789  PMID: 1502195

Abstract

Thymic epithelial cells (TEC) are known to secrete thymic hormones that influence maturation of T lymphocytes. One of these peptides, thymulin, requires zinc in an equimolar ratio for biological activity. A previous study [Cousins, R. J. & Leinart, A. S. (1988) FASEB J. 2, 2884-2890] showed that interleukin 1 (IL-1) in vivo stimulates zinc uptake by the thymus. Both the alpha and beta forms of IL-1, which stimulate proliferation of human TEC, also stimulate their uptake of zinc in vitro, and this latter stimulation is both dependent and independent of proliferation. Zinc induces zinc accumulation without proliferation. Two other stimulants of proliferation, bovine pituitary extract and epidermal growth factor, stimulate zinc uptake by TEC, but only in a manner dependent on proliferation. Utilizing in situ hybridization, we show that the IL-1 alpha and beta forms and zinc induce metallothionein mRNA expression TEC. Metallothionein is thought to be involved in the transfer of zinc to thymulin. IL-1 was shown to stimulate the secretion of thymulin as measured both by its ability to stimulate induction of IL-2 receptor-positive lymphocytes from human peripheral blood lymphocytes and by the azathioprine-sensitive rosette assay. In addition, the zinc-thymulin complex in the presence, but not absence, of IL-1 stimulates nuclear protein kinase C in isolated lymphocyte nuclei. IL-1 apparently regulates the synthesis or secretion and delivery of zinc-thymulin complex to the T-lymphocyte system.

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Selected References

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