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Effect of bowel resection on TLR signaling during intestinal adaptation in a rat model

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Abstract

Background

Bacterial overgrowth is common complication of short bowel syndrome (SBS) and is a result of an impaired gut barrier function. Toll-like receptor 4 (TLR4) is crucial in maintaining intestinal epithelial homeostasis, participates in a vigorous signaling process and heightens inflammatory cytokine output. The objective of this study was to determine the effects of bowel resection on TLR4 signaling in intestinal mucosa in a rat model.

Methods

Male Sprague–Dawley rats were randomly assigned to one of the two experimental groups of eight rats each: Sham rats underwent bowel transection and re-anastomosis and SBS rats underwent 75 % small bowel resection. Rats were killed on day 14. Bacterial translocation (BT) to mesenteric lymph nodes, liver, portal blood and peripheral blood was determined at the kill. The expression of TLR4, MyD88 and TRAF6 in the intestinal mucosa was determined using real-time PCR, Western blot and immunohistochemistry.

Results

SBS rats demonstrated a 100 % BT to lymph nodes and to liver (Level I), 80 % translocation to portal blood (Level II) and 60 % translocation to peripheral blood (Level III) at day 7 as well as a 100 % BT to lymph nodes and liver, and 40 % translocation to peripheral blood at day 14. Microarray expression profiling demonstrated that most of the TLR signaling-related genes were up-regulated in resected rats compared to control animals. SBS rats showed a significant increase in TLR4 and TRAF6 mRNA in jejunum and ileum, TLR4 and MyD88 protein expression in jejunum and ileum, and a significant increase in the number of TLR4 and TRAF6 positive cells (immunohistochemistry) compared to sham animals.

Conclusions

In a rat model of SBS, elevated intestinal BT is associated with a stimulated TLR4 signaling.

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Authors and Affiliations

  1. Laboratory of Intestinal Adaptation and Recovery, The Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel

    Igor Sukhotnik, Bassel Haj, Yulia Pollak & Tatiana Dorfman

  2. Department of Pediatric Surgery B, Bnai Zion Medical Center, 47 Golomb St., P.O.B. 4940, 31048, Haifa, Israel

    Igor Sukhotnik

  3. Department of Pathology, Bnai Zion Medical Center, Haifa, Israel

    Jacob Bejar

  4. Department of Surgery, Bnai Zion Medical Center, Haifa, Israel

    Bassel Haj & Ibrahim Matter

Authors
  1. Igor Sukhotnik
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  2. Bassel Haj
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  3. Yulia Pollak
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  4. Tatiana Dorfman
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  5. Jacob Bejar
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  6. Ibrahim Matter
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Corresponding author

Correspondence to Igor Sukhotnik.

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Disclosures

Drs. Igor Sukhotnik, Haj Bassel, Yulia Pollak, Tatiana Dorfman, Jacob Bejar, Ibrahim Matter have no conflicts of interest or financial ties to disclose.

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Sukhotnik, I., Haj, B., Pollak, Y. et al. Effect of bowel resection on TLR signaling during intestinal adaptation in a rat model. Surg Endosc 30, 4416–4424 (2016). https://doi.org/10.1007/s00464-016-4760-x

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  • DOI: https://doi.org/10.1007/s00464-016-4760-x

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