Sodium butyrate enhances complement-mediated cell injury via down-regulation of decay-accelerating factor expression in colonic cancer cells - PubMed (original) (raw)
Sodium butyrate enhances complement-mediated cell injury via down-regulation of decay-accelerating factor expression in colonic cancer cells
Akira Andoh et al. Cancer Immunol Immunother. 2002 Feb.
Abstract
Decay-accelerating factor (DAF) expressed on the surface of colonic cancer cells presents a barrier to complement-mediated clearance by contributing to the ineffectiveness of the humoral immune response. In this study, to investigate the mechanisms responsible for the anti-tumor effects of butyrate, we evaluated how butyrate modulates DAF expression in colonic cancer cells. Three colonic cancer cell lines (HT-29, Caco-2, and T84 cells) were studied. DAF protein expression was assessed by western blot, and DAF mRNA expression was evaluated by northern blot. Complement C3 deposition on the surface of colonic cancer cells was determined by enzyme-linked immunosorbent assay (ELISA). The promoter activity of the DAF gene was assessed by a reporter gene-luciferase assay. Butyrate reduced the basal and interleukin-4 (IL-4)- and tumor necrosis factor-alpha (TNF-alpha)-induced expression of DAF protein and mRNA in HT-29 cells. It increased the susceptibility to complement attack and enhanced C3 deposition on HT-29 cells. The inhibitory effect of butyrate on DAF mRNA expression was also observed in T84 and Caco-2 cells. Butyrate decreased basal DAF expression at both transcriptional and post-transcriptional levels. The inhibitory effect of butyrate on IL-4-induced DAF expression was closely associated with a blockade of IL-4-induced DAF mRNA stability. TNF-alpha-induced transcriptional activation and the increased stability of the DAF gene were also blocked by butyrate. Similar but weak effects were induced by trichostatin A, a potent histone deacetylase inhibitor, suggesting that histone acetylation might participate in butyrate activity. These observations indicate that both a down-regulation of DAF expression and the induction of susceptibility to complement attack contribute to the anti-tumor effects of butyrate in colonic cancer.
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