Save

Limosilactobacillus reuteri ATCC 6475 metabolites upregulate the serotonin transporter in the intestinal epithelium

In: Beneficial Microbes
Authors:
M. Engevik Department of Pathology & Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
Department of Regenerative Medicine & Cell Biology, Medical University of South Carolina, 173 Ashely Ave, BSB 626, Charleston, SC 29425, USA.

Search for other papers by M. Engevik in
Current site
Google Scholar
PubMed
Close
,
W. Ruan Department of Pediatrics, Baylor College of Medicine, 6701 Fannin Street, Houston, TX 77030, USA.
Section of Gastroenterology, Hepatology, and Nutrition, Texas Children’s Hospital, 6701 Fannin St, Houston, TX 77030, USA.

Search for other papers by W. Ruan in
Current site
Google Scholar
PubMed
Close
,
C. Visuthranukul Department of Pathology & Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
Pediatric Nutrition Research Unit, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.

Search for other papers by C. Visuthranukul in
Current site
Google Scholar
PubMed
Close
,
Z. Shi Department of Pathology & Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
Department of Pathology, Texas Children’s Hospital, 6621 Fannin St, Houston, TX 77030, USA.

Search for other papers by Z. Shi in
Current site
Google Scholar
PubMed
Close
,
K.A. Engevik Department of Molecular Virology & Microbiology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 7703, USA.

Search for other papers by K.A. Engevik in
Current site
Google Scholar
PubMed
Close
,
A.C. Engevik Departments of Surgery, Vanderbilt University Medical Center, 1211 Medical Center Dr, Nashville, TN 37232, USA.

Search for other papers by A.C. Engevik in
Current site
Google Scholar
PubMed
Close
,
R. Fultz Department of Neuroscience, Cell Biology, and Anatomy, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555-0625, USA.

Search for other papers by R. Fultz in
Current site
Google Scholar
PubMed
Close
,
D.A. Schady Department of Pathology & Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
Department of Pathology, Texas Children’s Hospital, 6621 Fannin St, Houston, TX 77030, USA.

Search for other papers by D.A. Schady in
Current site
Google Scholar
PubMed
Close
,
J.K. Spinler Department of Pathology & Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
Department of Pathology, Texas Children’s Hospital, 6621 Fannin St, Houston, TX 77030, USA.

Search for other papers by J.K. Spinler in
Current site
Google Scholar
PubMed
Close
, and
J. Versalovic Department of Pathology & Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
Department of Pathology, Texas Children’s Hospital, 6621 Fannin St, Houston, TX 77030, USA.

Search for other papers by J. Versalovic in
Current site
Google Scholar
PubMed
Close

The serotonin transporter (SERT) readily takes up serotonin (5-HT), thereby regulating the availability of 5-HT within the intestine. In the absence of SERT, 5-HT remains in the interstitial space and has the potential to aberrantly activate the many 5-HT receptors distributed on the epithelium, immune cells and enteric neurons. Perturbation of SERT is common in many gastrointestinal disorders as well as mouse models of colitis. Select commensal microbes regulate intestinal SERT levels, but the mechanism of this regulation is poorly understood. Additionally, ethanol upregulates SERT in the brain and dendritic cells, but its effects in the intestine have never been examined. We report that the intestinal commensal microbe Limosilactobacillus (previously classified as Lactobacillus) reuteri ATCC PTA 6475 secretes 83.4 mM ethanol. Consistent with the activity of L. reuteri alcohol dehydrogenases, we found that L. reuteri tolerated various levels of ethanol. Application of L. reuteri conditioned media or exogenous ethanol to human colonic T84 cells was found to upregulate SERT at the level of mRNA. A 4-(4-(dimethylamino) phenyl)-1-methylpyridinium (APP+) uptake assay confirmed the functional activity of SERT. These findings were mirrored in mouse colonic organoids, where L. reuteri metabolites and ethanol were found to upregulate SERT at the apical membrane. Finally, in a trinitrobenzene sulphonic acid model of acute colitis, we observed that mice treated with L. reuteri maintained SERT at the colon membrane compared with mice receiving phosphate buffered saline vehicle control. These data suggest that L. reuteri metabolites, including ethanol, can upregulate SERT and may be beneficial for maintaining intestinal homeostasis with respect to serotonin signalling.

Content Metrics

All Time Past 365 days Past 30 Days
Abstract Views 0 0 0
Full Text Views 934 358 17
PDF Views & Downloads 898 318 6