Cited by 27Immune Response and InflammationGastrointestinal motility and disordersGut microbiota and health

NOD1 downregulates intestinal serotonin transporter and interacts with other pattern recognition receptors

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Layunta, Elena, Latorre, Eva, Forcén, Raquel, Grasa, Laura, Plaza, Miguel A., Arias, Maykel, Alcalde, Ana I., Mesonero, José E.·2018·Journal of Cellular Physiology

Abstract

Serotonin (5-HT) is an essential gastrointestinal modulator whose effects regulate the intestinal physiology. 5-HT effects depend on extracellular 5-HT bioavailability, which is controlled by the serotonin transporter (SERT) expressed in both the apical and basolateral membranes of enterocytes. SERT is a critical target for regulating 5-HT levels and consequently, modulating the intestinal physiology. The deregulation of innate immune receptors has been extensively studied in inflammatory bowel diseases (IBD), where an exacerbated defense response to commensal microbiota is observed. Interestingly, many innate immune receptors seem to affect the serotonergic system, demonstrating a new way in which microbiota could modulate the intestinal physiology. Therefore, our aim was to analyze the effects of NOD1 activation on SERT function, as well as NOD1's interaction with other immune receptors such as TLR2 and TLR4. Our results showed that NOD1 activation inhibits SERT activity and expression in Caco-2/TC7 cells through the extracellular signal-regulated kinase (ERK) signaling pathway. A negative feedback between 5-HT and NOD1 expression was also described. The results showed that TLR2 and TLR4 activation seems to regulate NOD1 expression in Caco-2/TC7 cells. To assess the extend of cross-talk between NOD1 and TLRs, NOD1 expression was measured in the intestinal tract (ileum and colon) of wild type mice and mice with individual knockouts of TLR2, and TLR4 as well as double knockout TLR2/TLR4 mice. Hence, we demonstrate that NOD1 acts on the serotonergic system decreasing SERT activity and molecular expression. Additionally, NOD1 expression seems to be modulated by 5-HT and other immune receptors as TLR2 and TLR4. This study could clarify the relation between both the intestinal serotonergic system and innate immune system, and their implications in intestinal inflammation.

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Authors
Layunta, E., Latorre, E., Forcén, R., Grasa, L., Plaza, M. A., Arias, M., Alcalde, A. I., & Mesonero, J. E.
Affiliations
  • Universidad de Zaragoza (ES)
  • University of Exeter (GB)
  • Departamento Farmacología y Fisiología Facultad de Veterinaria Instituto de Investigación Sanitaria de Aragón (IIS) Universidad de Zaragoza Zaragoza Spain
Corresponding author
Latorre, Eva
Venue
Journal of Cellular Physiology
Publisher
Wiley
Published
2017-12-29
Volume
233
Issue
5
Pages
4183-4193
ISSN
  • 0021-9541 (ISSN-L)
  • 1097-4652
OpenAlex
W2763249804
Cited by
27
References
46
Citations by year
2025: 4 · 2024: 2 · 2023: 4 · 2022: 2 · 2021: 6 · 2020: 4 · 2019: 4 · 2018: 1
FWCI
1.11
Type
journal article
Language
en
Open access
Locations
  • Journal of Cellular Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by-nc-nd)
  • Zaguan (University of Zaragoza Repository) (submittedVersion, cc-by-nc-nd)
Funders
  • Foundation for the Study of Inflammatory Bowel Diseases in Aragón (ARAINF 012/2008)
  • ARAID Foundation (SAF2014-54763-C2-1-R)
  • ERDF/FEDER (BFU2010-18971)
  • European Social Found (ESF) and the Aragon Regional Government B61
  • Aragon Regional Government (B022/13)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
Keywords
NOD1, serotonin transporter, serotonin, serotonergic system, pattern recognition receptors, TLR2, TLR4, ERK signaling, innate immunity, intestinal inflammation, inflammatory bowel disease, commensal microbiota, Caco-2/TC7 cells, negative feedback regulation
MeSH terms
Animals, Humans, Intestinal Mucosa, Serotonin, Mice, Knockout, Caco-2 Cells, Enterocytes, Serotonin Plasma Membrane Transport Proteins, Toll-Like Receptor 2, Toll-Like Receptor 4, Mice, Nod1 Signaling Adaptor Protein

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