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Availability of the intestinal 5-HT is dependent on serotonin transporter (SERT), which uptakes 5-HT and facilitates its degradation. Interestingly, Toll-like receptor 2 (TLR-2) is co-localized with 5-HT, which suggests a possible impact of neuroendocrine cells in the inflammatory response through TLR-2 activation. Serum 5-HT levels were measured in 80 Crohn\u2019s disease (CD) patients and 40 healthy control subjects. Additionally, fully differentiated Caco-2 monolayers were infected with\n                    <jats:italic>Mycobacteria paratuberculosis<\/jats:italic>\n                    (MAP),\n                    <jats:italic>L. monocytogenes,<\/jats:italic>\n                    or\n                    <jats:italic>M. smegmatis<\/jats:italic>\n                    in the presence of exogenous 5-HT at different concentrations. Cells were subsequently harvested and used for measuring SERT activity, RNA isolation followed by RT-PCR, protein quantification, and tissue damage markers (DHE, LDH, GSH and MDA). TLR-2 intracellular signaling pathways were assessed by pre-incubating Caco-2 monolayers with selective blockers of ERK, cAMP\/PKA, p38 MAPK, and 5-HT\n                    <jats:sub>3<\/jats:sub>\n                    receptors. MAP-infected CD patients (\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u200940) had higher serum 5-HT levels (462.95\u2009\u00b1\u20098.55\u00a0ng\/mL,\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u200940) than those without MAP infection (385.33\u2009\u00b1\u200910.3\u00a0ng\/mL,\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u200940). TLR-2 activation by enteropathogenic bacteria inhibited SERT activity in the presence of exogenous 5-HT by up to 50%. These effects were increasing gradually over 72\u00a0h, and MAP infection had the greatest effect on SERT inhibition when cells were exposed to 5-HT in a concentration dependent manner. Additionally, inhibition of SERT activity was accompanied with higher levels of pro-inflammatory cytokines (TNF-\u03b1, IL-6, IL-8) and oxidative stress markers (DHE, LDH and MDA), whereas SERT expression and protein level were downregulated. Consequently, inhibition of TLR-2 and p38 MAPK signaling or blocking 5-HT\n                    <jats:sub>3<\/jats:sub>\n                    receptors restored SERT activity and reduced the production of pro-inflammatory cytokines, as reflected by the downregulation of oxidative stress and tissue damage markers. The involvement of TLR-2 in the intestinal pathology might be concluded not only from its innate immune role, but also from its effect on modulating the intestinal serotonergic response. Ultimately, regulating the intestinal serotonergic system can be therapeutically exploited to mitigate other enteropathogenic infections, which will help in understanding the gut-microbiome-brain connection.\n                  <\/jats:p>","DOI":"10.1038\/s41598-021-02050-3","type":"journal-article","created":{"date-parts":[[2021,11,19]],"date-time":"2021-11-19T06:03:26Z","timestamp":1637301806000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Enteropathogenic infections modulate intestinal serotonin transporter (SERT) function by activating Toll-like receptor 2 (TLR-2) in Crohn\u2019s disease"],"prefix":"10.1038","volume":"11","author":[{"given":"Ahmad","family":"Qasem","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abed Elrahman","family":"Naser","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saleh A.","family":"Naser","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,11,19]]},"reference":[{"issue":"9","key":"2050_CR1","doi-asserted-by":"publisher","first-page":"1091","DOI":"10.1177\/0269881117725915","volume":"31","author":"RL Carhart-Harris","year":"2017","unstructured":"Carhart-Harris, R. 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