Sphingosine 1-phosphate Stimulates Insulin Secretion and Improves Cell Survival by Blocking Voltage-dependent K+ Channels in β Cells.

Abstract

Recent studies suggest that Sphingosine 1-phosphate (S1P) plays an important role in regulating glucose metabolism in type 2 diabetes. However, its effects and mechanisms of promoting insulin secretion remain largely unknown. Here, we found that S1P treatment decreased blood glucose level and increased insulin secretion in C57BL/6 mice. Our results further showed that S1P promoted insulin secretion in a glucose-dependent manner. This stimulatory effect of S1P appeared to be irrelevant to cyclic adenosine monophosphate signaling. Voltage-clamp recordings showed that S1P did not influence voltage-dependent Ca2+ channels, but significantly blocked voltage-dependent potassium (Kv) channels, which could be reversed by inhibition of phospholipase C (PLC) and protein kinase C (PKC). Calcium imaging revealed that S1P increased intracellular Ca2+ levels, mainly by promoting Ca2+ influx, rather than mobilizing intracellular Ca2+ stores. In addition, inhibition of PLC and PKC suppressed S1P-induced insulin secretion. Collectively, these results suggest that the effects of S1P on glucose-stimulated insulin secretion (GSIS) depend on the inhibition of Kv channels via the PLC/PKC signaling pathway in pancreatic β cells. Further, S1P improved β cell survival; this effect was also associated with Kv channel inhibition. This work thus provides new insights into the mechanisms whereby S1P regulates β cell function in diabetes.

• Authors: Zhihong Liu, Huanhuan Yang, Linping Zhi, Huan Xue, Zhihong Lu, Yanli Zhao, Lijuan Cui, Tao Liu, Shouan Ren, Peifeng He, Yunfeng Liu, Yi Zhang
• Journal: Frontiers in pharmacology (Front Pharmacol) Vol. 12 Pg. 683674 ( 2021) ISSN: 1663-9812 [Print] Switzerland
• PMID: 34322019 (Publication Type: Journal Article)
• Copyright: Copyright © 2021 Liu, Yang, Zhi, Xue, Lu, Zhao, Cui, Liu, Ren, He, Liu and Zhang.