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. 1990 Jan;69(1):52–56.

Secretion of interleukin-6 (IL-6) by human monocytes stimulated by muramyl dipeptide and tumour necrosis factor alpha.

J Sancéau 1, R Falcoff 1, F Beranger 1, D B Carter 1, J Wietzerbin 1
PMCID: PMC1385719  PMID: 1690177

Abstract

We studied IL-6 gene expression in human monocytes stimulated by muramyl dipeptide (MDP), a synthetic immunomodulator derived from mycobacterial cell walls. In control monocytes, two IL-6 transcripts of 3.4 kb and 1.6 kb were easily detected at 2.5 hr of culture and remained stable until 18 hr. In MDP-treated monocytes, three IL-6 RNA species displayed different kinetics of accumulation: a 3.4 kb RNA whose expression already reached its maximum after 2.5 hr exposure to MDP; a 1.6 kb RNA whose expression peaked at 5 hr; and a new RNA species of 1.4 kb which was transiently induced in early time of cell stimulation. TNF-alpha co-operated with MDP to increase IL-6 gene expression and secretion of biological active protein (measured by the hybridoma plasmacytoma growth factor assay). MDP exhibits a broad spectrum of immunomodulation properties such as adjuvant activity, enhancement of macrophage cytotoxicity against tumour and induction of non-specific resistance to intracellular agents. The results reported here suggest that these properties might be linked to the stimulation by MDP of genes coding for key cytokines such as IL-6, TNF and IL-1.

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Selected References

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