Interleukin-4 and interleukin-13 potentiate interleukin-1 induced secretion of interleukin-6 in human osteoblast-like cells.
Formation of interleukin-6 (IL-6) in osteoblasts and bone marrow stromal cells is believed to regulate osteoclast recruitment. The anti-inflammatory cytokines interleukin-4 and -13 (IL-4 and IL-13) stimulate IL-6 production in human osteoblasts. We investigated the relative potencies, and synergistic effects, between IL-4, IL-13 and interleukin-1 (IL-1) on IL-6 formation in human osteoblast-like cells. Isolated human osteoblast-like cells were incubated for 72 h in the presence of various concentrations of IL-4, IL-13 and IL-1, and IL-6 secretion was measured by ELISA. All cytokines stimulated the secretion of IL-6. The rank order of potency was IL-1>>IL-4>IL-13. There were no additive or synergistic effects between IL-4 and IL-13. However, co-stimulation with IL-1 and IL-4 resulted in a marked synergistic effect on IL-6 secretion. Co- stimulation with IL-1 and IL-13 gave a minor synergistic effect. In conclusion, IL-4/13 synergistically potentiates IL-1 induced secretion of IL-6 in human osteoblast-like cells.
Silfverswärd
Carl-Johan
CJ
Department of Surgical Sciences, University of Uppsala, S-751 85 Uppsala, Sweden. carl-johan.silfversward@surgsci.uu.se
Frost
Anders
A
Brändström
Helena
H
Nilsson
Olle
O
Ljunggren
Osten
O
D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology*; D018793:Interleukin-13 / Q000494:pharmacology*; D015847:Interleukin-4 / Q000494:pharmacology*; D015850:Interleukin-6 / Q000378:metabolism*; D010006:Osteoblasts / Q000187:drug effects* / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
D007375:Interleukin-1; D018793:Interleukin-13; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4