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Subjects with Diarrhea-Predominant IBS Have Increased Rectal Permeability Responsive to Tryptase

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Abstract

Background and Aims

Patients with diarrhea-predominant irritable bowel syndrome (IBS-D) appear to have increased intestinal permeability; it has been suggested that activation of protease-activated receptor-2 (PAR-2) receptors is responsible for this alteration. The aims of this study are to evaluate (1) if rectal (large bowel) permeability is increased in IBS-D and (2) if tryptase plays a critical role in the altered permeability.

Methods

Rectal biopsies from 20 patients with IBS-D and 30 subjects without the condition (normal controls) were assessed for macromolecular permeability using horseradish peroxidase in Ussing chambers in the basal state and after addition of drugs to the basolateral side. Reverse-transcription polymerase chain reaction (RT-PCR) was performed using colonic biopsy tissues from patients with IBS-D and normal subjects.

Results

When tryptase was added to the basolateral (not mucosal) side of normal rectal biopsy tissues, permeability appeared to be proportional to the increase in tryptase concentration (P < 0.05) and was abolished by the addition of tryptase inhibitor (100 μM nafamostat; 1.568 ± 0.874 ng/2 h/mm2 to 0.766 ± 0.661 ng/2 h/mm2, n = 14, respectively, P < 0.01). Intestinal permeability in patients with IBS-D was significantly increased compared with controls (0.848 ± 0.0.600 ng/2 h/mm2, n = 21, P < 0.01). Nafamostat significantly reduced the enhanced permeability in IBS-D (0.934 ± 0.589 ng/2 h/mm2 to 0.247 ± 0.263 ng/2 h/mm2, n = 14, respectively, P < 0.05). Transcription levels of PAR2 measured by RT-PCR did not differ between IBS-D and normal subjects.

Conclusion

Tryptase seems to play an important role in the control of human colonic mucosal permeability, and enhanced tryptase activity was responsible for the increased permeability of rectal mucosa in IBS patients.

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Authors and Affiliations

  1. Department of Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea

    Jae Woong Lee, Jung Ho Park, Dong I. L. Park, Hong Joo Kim, Yong Kyun Cho, Chong I. L. Sohn, Woo Kyu Jeon & Byung Ik Kim

  2. Department of BioNano Technology and Gaehon BioNano Research Institute, Kyungwon University, Seongnam, Gyeonggi-Do, 461-701, Republic of Korea

    Jung-Hwan Park

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  1. Jae Woong Lee
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Correspondence to Jung Ho Park.

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Lee, J.W., Park, J.H., Park, D.I.L. et al. Subjects with Diarrhea-Predominant IBS Have Increased Rectal Permeability Responsive to Tryptase. Dig Dis Sci 55, 2922–2928 (2010). https://doi.org/10.1007/s10620-009-1094-8

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  • DOI: https://doi.org/10.1007/s10620-009-1094-8

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