The study was designed to examine the immunomodulatory effect of three commercial sweeteners on human peripheral blood mononuclear cells (PBMC) and on the immune dialogue between these and human HT-29 and HuCC colon cancer lines. PBMC were incubated with Sweet’N Low, Splenda and Stevia and the cytokine production was examined. The cytokine release of PBMC co-cultured with colon cancer cells in the presence of sweeteners was evaluated. Sweet’N Low enhanced IFNγ, IL-1β and IL-6 release, and augmented HuCC-induced IL-10 secretion. Splenda reduced IFNγ and TNFα secretion by LPS and HuCC stimulated PBMC and enhanced HuCC-induced IL-10 and IL-1ra production. Stevia reduced IL-1β, TNFα and IL-1ra secretion prompted by HuCC and HT-29 cells and enhanced IL-6 production induced by HuCC. The inhibition of pro-inflammatory- and increased anti-inflammatory cytokines release by Splenda and Stevia indicate that they possess valuable potential as carcinopreventive agents.
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