Interleukin-10 inhibits expression of interleukin-6 and -8 mRNA in human dental pulp cell cultures via nuclear factor-kappaB deactivation

The effects of interleukin (IL)-10 on the expression of IL-6 and IL-8 mRNA in human dental pulp cell cultures were investigated by using the Northern blot analysis. On stimulation with Prevotella intermedia lipopolysaccharide (PiLPS), IL-10 was produced in peripheral blood but was not detected in human dental pulp cell culture supernatants. IL-10 inhibited IL-8 mRNA expression, which is normally stimulated by PiLPS, IL-1alpha, and tumor necrosis factor-alpha and inhibited IL-6 mRNA expression, which is normally stimulated by IL-1alpha. In addition, IL-10 inhibited the activation of nuclear factor-kappaB, which is normally induced by PiLPS. We conclude that IL-10 inhibits expression of IL-6 and IL-8 mRNA in dental pulp cell cultures by inhibiting the activation of nuclear factor-kappaB.