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Simulated colon fiber metabolome regulates genes involved in cell cycle, apoptosis, and energy metabolism in human colon cancer cells

  • Heli Putaala
  • Harri Mäkivuokko
  • Kirsti Tiihonen
  • Nina Rautonen
Article

Abstract

High level of dietary fiber has been epidemiologically linked to protection against the risk for developing colon cancer. The mechanisms of this protection are not clear. Fermentation of dietary fiber in the colon results in production of for example butyrate that has drawn attention as a chemopreventive agent. Polydextrose, a soluble fiber that is only partially fermented in colon, was fermented in an in vitro colon simulator, in which the conditions mimic the human proximal, ascending, transverse, and distal colon in sequence. The subsequent fermentation metabolomes were applied on colon cancer cells, and the gene expression changes studied. Polydextrose fermentation down-regulated gene ontology classes linked with cell cycle, and affected number of metabolically active cells. Furthermore, up-regulated effects on classes linked with apoptosis, with increased caspase 2 and 3 activity, implicate that polydextrose fermentation plays a role in induction of apoptosis in colon cancer cells. The up-regulated genes involved also key regulators of lipid metabolism, such as PPARα and PGC-1α. These results offer hypotheses for the mechanisms of two health benefits linked with consumption of dietary fiber, reducing risk of development of colon cancer, and dyslipidemia.

Keywords

Colon cancer Fiber Microarray Polydextrose Simulation 

Notes

Acknowledgments

The authors wish to acknowledge Ilana Saarikko (Pharmatest Services Ltd) for contribution in the data analysis. Henna Röytiö (Danisco Health & Nutrition) is thanked for supplying unpublished data and PDX simulation samples.

Supplementary material

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Copyright information

© Springer Science+Business Media, LLC. 2011

Authors and Affiliations

  • Heli Putaala
    • 1
  • Harri Mäkivuokko
    • 1
    • 2
  • Kirsti Tiihonen
    • 1
  • Nina Rautonen
    • 1
  1. 1.Danisco Health & NutritionKantvikFinland
  2. 2.The Finnish Red Cross Blood Service, R&DHelsinkiFinland

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