Bibliographic Details
| Title: |
The Heteromeric Complex Formed by Dopamine Receptor D5 and CCR9 Leads the Gut Homing of CD4+ T Cells Upon InflammationSummary |
| Authors: |
Francisco Osorio-Barrios, Gemma Navarro, Javier Campos, Valentina Ugalde, Carolina Prado, Iu Raïch, Francisco Contreras, Ernesto López, Alexandra Espinoza, Alvaro Lladser, Rafael Franco, Rodrigo Pacheco |
| Source: |
Cellular and Molecular Gastroenterology and Hepatology, Vol 12, Iss 2, Pp 489-506 (2021) |
| Publisher Information: |
Elsevier, 2021. |
| Publication Year: |
2021 |
| Collection: |
LCC:Diseases of the digestive system. Gastroenterology |
| Subject Terms: |
Dopaminergic Regulation, Chemokine Receptors, G Protein–Coupled Receptors Heteromers, T Cell Migration, Gut Tropism, Inflammatory Colitis, Diseases of the digestive system. Gastroenterology, RC799-869 |
| More Details: |
Background and Aims: CD4+ T cells constitute central players in inflammatory bowel diseases (IBDs), driving inflammation in the gut mucosa. Current evidence indicates that CCR9 and the integrin α4β7 are necessary and sufficient to imprint colonic homing on CD4+ T cells upon inflammation. Interestingly, dopaminergic signaling has been previously involved in leukocyte homing. Despite dopamine levels are strongly reduced in the inflamed gut mucosa, the role of dopamine in the gut homing of T cells remains unknown. Here, we study how dopaminergic signaling affects T cells upon gut inflammation. Methods: Gut inflammation was induced by transfer of naïve T cells into Rag1–/– mice or by administration of dextran sodium sulfate. T cell migration and differentiation were evaluated by adoptive transfer of congenic lymphocytes followed by flow cytometry analysis. Protein interaction was studied by bioluminescence resonance energy transfer analysis, bimolecular fluorescence complementation, and in situ proximity ligation assays. Results: We show the surface receptor providing colonic tropism to effector CD4+ T cells upon inflammation is not CCR9 but the complex formed by CCR9 and the dopamine receptor D5 (DRD5). Assembly of the heteromeric complex was demonstrated in vitro and in vivo using samples from mouse and human origin. The CCR9:DRD5 heteroreceptor was upregulated in the intestinal mucosa of IBD patients. Signaling assays confirmed that complexes behave differently than individual receptors. Remarkably, the disruption of CCR9:DRD5 assembly attenuated the recruitment of CD4+ T cells into the colonic mucosa. Conclusions: Our findings describe a key homing receptor involved in gut inflammation and introduce a new cell surface module in immune cells: macromolecular complexes formed by G protein-coupled receptors integrating the sensing of multiple molecular cues. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2352-345X |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S2352345X21000771; https://doaj.org/toc/2352-345X |
| DOI: |
10.1016/j.jcmgh.2021.04.006 |
| Access URL: |
https://doaj.org/article/80b96c1220db41d58f4765c6e2d56f9a |
| Accession Number: |
edsdoj.80b96c1220db41d58f4765c6e2d56f9a |
| Database: |
Directory of Open Access Journals |
