Abstract
Objective
Intestinal intraepithelial lymphocytes (IELs) play critical roles in disrupting epithelial homeostasis after Toll-like receptor (TLR)-3 activation with genomic rotavirus dsRNA or the synthetic dsRNA analog poly(I:C). The capacity of immunobiotic Lactobacillus rhamnosus CRL1505 (Lr1505) or Lactobacillus plantarum CRL1506 (Lp1506) to beneficially modulate IELs response after TLR3 activation was investigated in vivo using a mice model.
Results
Intraperitoneal administration of poly(I:C) induced inflammatory-mediated intestinal tissue damage through the increase of inflammatory cells (CD3+NK1.1+, CD3+CD8αα+, CD8αα+NKG2D+) and pro-inflammatory mediators (TNF-α, IL-1β, IFN-γ, IL-15, RAE1, IL-8). Increased expression of intestinal TLR3, MDA5, and RIG-I was also observed after poly(I:C) challenge. Treatment with Lr1505 or Lp1506 prior to TLR3 activation significantly reduced the levels of TNF-α, IL-15, RAE1, and increased serum and intestinal IL-10. Moreover, CD3+NK1.1+, CD3+CD8αα+, and CD8αα+NKG2D+ cells were lower in lactobacilli-treated mice when compared to controls. The immunomodulatory capacities of lactobacilli allowed a significant reduction of intestinal tissue damage.
Conclusions
This work demonstrates the reduction of TLR3-mediated intestinal tissue injury by immunobiotic lactobacilli through the modulation of intraepithelial lymphocytes response. It is a step forward in the understanding of the cellular mechanisms involved in the antiviral capabilities of immunobiotic strains.








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Abbreviations
- AST:
-
Aspartate aminotransferase
- APC:
-
Antigen presenting cells
- DC:
-
Dendritic cells
- dsRNA:
-
Double-stranded RNA
- IELs:
-
Intraepithelial lymphocytes
- IECs:
-
Intestinal epithelial cells
- IFN:
-
Interferon
- IL-1:
-
Interleukin
- LAB:
-
Lactic acid bacteria
- LDH:
-
Lactate dehydrogenase
- Lp1506:
-
Lactobacillus plantarum CRL1506
- Lr1505:
-
Lactobacillus rhamnosus CRL1505
- MAMPs:
-
Microbe-associated molecular patterns
- RAE1:
-
Retinoic acid early inducible-1
- RVs:
-
Rotavirus
- TLR:
-
Toll-like receptor
- TNF:
-
Tumor necrosis factor
- PIE:
-
Porcine intestinal epithelial cells
- PRRs:
-
Pattern recognition receptors
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Acknowledgments
This study was supported by a ANPCyT—FONCyT Grant PICT-2013 (No. 3219) to Dr. J. Villena and Grant-in-Aid for Scientific Research (B)(2) (No. 24380146, 16H05019) and Challenging Exploratory Research (No. 23658216, 26660216, 16K15028) from the Japan Society for the Promotion of Science (JSPS) to Dr. H. Kitazawa.
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All experiments were carried out in compliance with the Guide for Care and Use of Laboratory Animals and approved by the Ethical Committee of Animal Care at CERELA, Argentina (Protocol Number BIOT-CRL/14).
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The authors declare that they have no competing interests.
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Responsible Editor: John Di Battista.
A. Tada and H. Zelaya contributed equally to this work.
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Tada, A., Zelaya, H., Clua, P. et al. Immunobiotic Lactobacillus strains reduce small intestinal injury induced by intraepithelial lymphocytes after Toll-like receptor 3 activation. Inflamm. Res. 65, 771–783 (2016). https://doi.org/10.1007/s00011-016-0957-7
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DOI: https://doi.org/10.1007/s00011-016-0957-7


