Abstract
Food allergy (FA) is a common allergic disease without any currently available effective drug therapies. Mucosal mast cells (MMCs) play a particularly important role in FA, and the increase in their cytosolic Ca2+ concentration ([Ca2+]cyt) is considered to be a principal component of the degranulation process. However, the mechanisms governing Ca2+ influx remain poorly understood in MMCs. Recent reports have highlighted the functions of the transient receptor potential melastatin 2 (TRPM2) channel in immunocytes, including its role in monocyte chemokine production and macrophage phagocytic activity. Although TRPM2 gene expression has been demonstrated in mast cells, the significance of such expression remains virtually unknown. In this study, we found that antigen-stimulated degranulation was significantly reduced in mucosal-type bone marrow-derived mast cells (mBMMCs) prepared from TRPM2-knockout (TRPM2-KO) mice (TRPM2-KO mBMMCs) and was suppressed following the administration of three TRPM2 inhibitors with different chemical structures, including econazole, flufenamic acid (FFA), and 2-aminoethoxydiphenyl borate. Furthermore, the antigen-stimulated increase in [Ca2+]cyt was significantly decreased in TRPM2-KO mBMMCs and was also suppressed by the TRPM2 inhibitors econazole and FFA. In addition, thapsigargin-induced increase in [Ca2+]cyt was significantly decreased in TRPM2-KO mBMMCs. These results suggest that TRPM2 may participate in antigen-induced extracellular Ca2+ influx and subsequent degranulation. In addition, TRPM2 inhibitors were shown to improve food allergic reactions in a mouse model. Together, these results suggest that TRPM2 inhibitors suppress MMC degranulation via regulation of the increase in [Ca2+]cyt. Thus, TRPM2 may play a key role in degranulation by modulating intracellular Ca2+ in MMCs.
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Acknowledgments
We thank H. Mihara for help with cell preparation and operation of measuring instruments, M. Kashio for animal breeding and management, and K. Tsuneyama and M. Fujimoto for help with immunohistochemical staining. This research was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan to M. Kadowaki (nos. 21590760 and 24590879) and by the Knowledge Cluster Initiative Program of the Ministry of Education, Culture, Sports, Science and Technology of Japan to M. Kadowaki.
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Oda, S., Uchida, K., Wang, X. et al. TRPM2 contributes to antigen-stimulated Ca2+ influx in mucosal mast cells. Pflugers Arch - Eur J Physiol 465, 1023–1030 (2013). https://doi.org/10.1007/s00424-013-1219-y
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DOI: https://doi.org/10.1007/s00424-013-1219-y