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Immune Regulatory Roles of Cells Expressing Taste Signaling Elements in Nongustatory Tissues

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The Pharmacology of Taste

Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 275))

Abstract

G protein-coupled taste receptors and their downstream signaling elements, including Gnat3 (also known as α-gustducin) and TrpM5, were first identified in taste bud cells. Subsequent studies, however, revealed that some cells in nongustatory tissues also express taste receptors and/or their signaling elements. These nongustatory-tissue-expressed taste receptors and signaling elements play important roles in a number of physiological processes, including metabolism and immune responses. Special populations of cells expressing taste signaling elements in nongustatory tissues have been described as solitary chemosensory cells (SCCs) and tuft cells, mainly based on their morphological features and their expression of taste signaling elements as a critical molecular signature. These cells are typically scattered in barrier epithelial tissues, and their functions were largely unknown until recently. Emerging evidence shows that SCCs and tuft cells play important roles in immune responses to microbes and parasites. Additionally, certain immune cells also express taste receptors or taste signaling elements, suggesting a direct link between chemosensation and immune function. In this chapter, we highlight our current understanding of the functional roles of these “taste-like” cells and taste signaling pathways in different tissues, focusing on their activities in immune regulation.

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Acknowledgments

We would like to thank Dr. Karen Yee at the Monell Chemical Senses Center for her help with the schematic illustration in Fig. 1. We thank Drs. Yoshio Hirabayashi and Jennifer Pluznick for sharing Gprc5c knockout mice (Accession number: CDB0485K; http://www.clst.riken.jp/arg/mutant%20mice%20list.html).

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Correspondence to Hong Wang .

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© 2021 The Author(s), under exclusive license to Springer Nature Switzerland AG

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Wang, H., Matsumoto, I., Jiang, P. (2021). Immune Regulatory Roles of Cells Expressing Taste Signaling Elements in Nongustatory Tissues. In: Palmer, R.K., Servant, G. (eds) The Pharmacology of Taste . Handbook of Experimental Pharmacology, vol 275. Springer, Cham. https://doi.org/10.1007/164_2021_468

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