Effects of insulin signaling on mouse taste cell proliferation

Autoři: Shingo Takai aff001;  Yu Watanabe aff001;  Keisuke Sanematsu aff001;  Ryusuke Yoshida aff004;  Robert F. Margolskee aff002;  Peihua Jiang aff002;  Ikiru Atsuta aff003;  Kiyoshi Koyano aff003;  Yuzo Ninomiya aff002;  Noriatsu Shigemura aff001
Působiště autorů: Section of Oral Neuroscience, Faculty of Dental Science, Kyushu University, Fukuoka, Japan aff001;  Monell Chemical Senses Center, Philadelphia, PA, United States of America aff002;  Section of Removable Prosthodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan aff003;  Department of Oral Physiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan aff004;  Division of Sensory Physiology, Research and Development Center for Five-Sense Devices Taste and Odor Sensing, Kyushu University, Fukuoka, Japan aff005
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0225190


Expression of insulin and its receptor (IR) in rodent taste cells has been proposed, but exactly which types of taste cells express IR and the function of insulin signaling in taste organ have yet to be determined. In this study, we analyzed expression of IR mRNA and protein in mouse taste bud cells in vivo and explored its function ex vivo in organoids, using RT-PCR, immunohistochemistry, and quantitative PCR. In mouse taste tissue, IR was expressed broadly in taste buds, including in type II and III taste cells. With using 3-D taste bud organoids, we found insulin in the culture medium significantly decreased the number of taste cell and mRNA expression levels of many taste cell genes, including nucleoside triphosphate diphosphohydrolase-2 (NTPDase2), Tas1R3 (T1R3), gustducin, carbonic anhydrase 4 (CA4), glucose transporter-8 (GLUT8), and sodium-glucose cotransporter-1 (SGLT1) in a concentration-dependent manner. Rapamycin, an inhibitor of mechanistic target of rapamycin (mTOR) signaling, diminished insulin’s effects and increase taste cell generation. Altogether, circulating insulin might be an important regulator of taste cell growth and/or proliferation via activation of the mTOR pathway.

Klíčová slova:

Cell differentiation – Gene expression – Insulin – Insulin signaling – Organoids – Stem cells – Taste – Taste buds


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2019 Číslo 11