S1p Promotes Il-6 Expression In Osteoblasts Through The Pi3k, Mek/Erk And Nf-Kappa B Signaling Pathways

Rheumatoid arthritis (RA) is a systemic autoimmune inflammatory disease, in which the immune system attacks joint tissue. Interleukin (IL)-6 is a key proinflammatory cytokine in RA progression. Sphingosine-1-phosphate (S1P), a platelet-derived lysophospholipid mediator, reportedly regulates osteoimmunology. Here, we examined the effects of SIP on IL-6 expression in osteoblasts. Our results and records from the Gene Expression Omnibus (GEO) database demonstrate higher levels of IL-6 in patients with RA compared with those with osteoarthritis. Stimulation of osteoblasts with SIP increased mRNA and protein expression of IL-6. PI3K, MEK, ERK and NF-kappa B inhibitors and their small interfering RNAs (siRNAs) reduced S1P-promoted IL-6 expression. S1P also facilitated PI3K, MEK/ERK and NF-kappa B signaling cascades. Our results indicate that SIP promotes the expression of IL-6 in osteoblasts via the PI3K, MEK/ERK and NF-kappa B signaling pathways.