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Molecular mechanisms of probiotic action: it's all in the strains!
  1. Fergus Shanahan
  1. Correspondence to Professor Fergus Shanahan, Department of Medicine, Alimentary Pharmabiotic Centre, University College Cork, National University of Ireland, Clinical Sciences Building, Wilton, Cork, Ireland; f.shanahan{at}

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The influence of the commensal microbiota on intestinal and extra-intestinal development has been evident since the first studies of germ-free animals over a half-century ago. Microbial signals from the lumen of the gut are trophic for the digestive, immune and other systems, including the developing brain.1 2 In later life, reciprocal host–microbe interactions remain critical for mucosal homeostasis. Probiotic therapy is, in essence, an attempt to harness the beneficial effects of the commensal microbiota for the host.3 In most instances, the molecular underpinning of these exchanges remains to be defined but represents an intriguing strategy for identifying therapeutic targets and drug discovery.4 While the therapeutic potential of immunomodulatory molecules from pathogens is well recognised, the pursuit of bioactive molecules from the commensal gut microbiota is a more recent venture; examples include the discovery of bacteriocins with activity against Clostridium difficile and bacterial-derived immunomodulatory molecules.4 However, much more remains to be mined from the commensal microbiota.

The study by Fernandez and colleagues published in this issue of Gut (see page 1050 …

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  • Linked article 232918.

  • Funding FS is supported, in part, by the Science Foundation Ireland in the form of a research centre grant (Alimentary Pharmabiotic Centre) and by a research grant from GlaxoSmithKline Ltd.

  • Competing interests FS is affiliated with a multi-departmental university campus company, Alimentary Health Ltd, which investigates inter alia host–microbe interactions. The content of this paper was neither influenced nor constrained by that fact.

  • Provenance and peer review Commissioned; not externally peer reviewed.

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