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Sauna dehydration as a new physiological challenge model for intestinal barrier function.

Maria Fernanda Roca Rubio1, Ulrika Eriksson2, Robert J Brummer3

  • 1Nutrition-Gut-Brain Interactions Research Centre, Faculty of Medicine and Health, School of Medical Sciences, Örebro University, 701 82, Örebro, Sweden. fernanda.roca@oru.se.

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Sauna-induced dehydration significantly increased intestinal permeability in healthy subjects. This physiological challenge model offers a new way to study gut barrier function and potential interventions.

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Area of Science:

  • Gastroenterology
  • Physiology
  • Immunology

Background:

  • The intestinal barrier is vital for gut health, with increased permeability linked to various disorders.
  • Developing effective interventions and reliable in vivo challenge models for intestinal barrier function is crucial.

Purpose of the Study:

  • To investigate the impact of sauna-induced dehydration on intestinal barrier function.
  • To evaluate sauna dehydration as a potential physiological in vivo challenge model.

Main Methods:

  • Twenty healthy subjects participated in a randomized trial with three conditions: sauna dehydration (3% body weight loss), NSAID intake, and a negative control.
  • Intestinal permeability was measured using a multi-sugar urinary recovery test.
  • Plasma markers assessed intestinal damage, bacterial translocation, and cytokine profiles.

Main Results:

  • Sauna dehydration led to increased gastroduodenal and small intestinal permeability.
  • No significant changes in plasma intestinal fatty acid-binding protein (I-FABP) or liver fatty acid-binding protein (L-FABP) indicated minimal enterocyte damage.
  • Elevated levels of lipopolysaccharide-binding protein (LBP), IL-6, and IL-8 were observed, suggesting an inflammatory response.

Conclusions:

  • Sauna-induced dehydration effectively increases intestinal permeability.
  • This method serves as a promising new physiological in vivo challenge model for assessing intestinal barrier function.