Abstract
G-protein-coupled receptors (GPCRs) constitute the largest family of transmembrane receptors and regulate a variety of physiological and disease processes. Although the roles of many non-odorant GPCRs have been identified in vivo, several GPCRs remain orphans (oGPCRs). The gastrointestinal (GI) tract is the largest endocrine organ and is a promising target for drug discovery. Given their close link to physiological function, the anatomical and histological expression profiles of benchmark GI-related GPCRs, such as the cholecystokinin-1 receptor and GPR120, and 106 oGPCRs were investigated in the mucosal and muscle-myenteric nerve layers in the GI tract of C57BL/6J mice by quantitative real-time polymerase chain reaction. The mRNA expression patterns of these benchmark molecules were consistent with previous in situ hybridization and immunohistochemical studies, validating the experimental protocols in this study. Of 96 oGPCRs with significant mRNA expression in the GI tract, several oGPCRs showed unique expression patterns. GPR85, GPR37, GPR37L1, brain-specific angiogenesis inhibitor (BAI) 1, BAI2, BAI3, and GPRC5B mRNAs were preferentially expressed in the muscle-myenteric nerve layer, similar to GPCRs that are expressed in both the central and enteric nerve systems and that play multiple regulatory roles throughout the gut-brain axis. In contrast, GPR112, trace amine-associated receptor (TAAR) 1, TAAR2, and GPRC5A mRNAs were preferentially expressed in the mucosal layer, suggesting their potential roles in the regulation of secretion, immunity, and epithelial homeostasis. These anatomical and histological mRNA expression profiles of oGPCRs provide useful clues about the physiological roles of oGPCRs in the GI tract.
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Supplementary Fig. 1
Expression profiles of oGPCRs preferentially expressed in the muscle-myenteric nerve layer of the studied GI regions (DM duodenum, UIS upper intestine, LIS lower intestine, PC proximal colon, vertical axis relative expression levels \( \left( {{2^{ - \Delta \Delta {\text{Ct}}}}} \right) \) of the respective genes, filled columns expression in the mucosal nerve layers, open columns expression in the muscle-myenteric nerve layers) (PDF 20 kb)
Supplementary Fig. 2
Expression profiles of oGPCRs preferentially expressed in the mucosal layer of the studied GI regions (DM duodenum, UIS upper intestine, LIS lower intestine, PC proximal colon, vertical axis relative expression levels \( \left( {{2^{ - \Delta \Delta {\text{Ct}}}}} \right) \) of the respective genes, filled columns expression in the mucosal nerve layers, open columns expression in the muscle-myenteric nerve layers) (PDF 17.5 kb)
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Ito, J., Ito, M., Nambu, H. et al. Anatomical and histological profiling of orphan G-protein-coupled receptor expression in gastrointestinal tract of C57BL/6J mice. Cell Tissue Res 338, 257–269 (2009). https://doi.org/10.1007/s00441-009-0859-x
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DOI: https://doi.org/10.1007/s00441-009-0859-x