5-IP7 is a GPCR messenger mediating neural control of synaptotagmin-dependent insulin exocytosis and glucose homeostasis.
Xiaozhe ZhangNa LiJun ZhangYanshen ZhangXiaoli YangYifan LuoBobo ZhangZhixue XuZhenhua ZhuXiuyan YangYuan YanBiao LinShen WangDa ChenCaichao YeYan DingMingliang LouQingcui WuZhanfeng HouKeren ZhangZiming LiangAnqi WeiBianbian WangChanghe WangNan JiangWenqing ZhangGuozhi XiaoCong MaYan RenXiangbing QiWeiping HanChao WangFeng RaoPublished in: Nature metabolism (2021)
5-diphosphoinositol pentakisphosphate (5-IP7) is a signalling metabolite linked to various cellular processes. How extracellular stimuli elicit 5-IP7 signalling remains unclear. Here we show that 5-IP7 in β cells mediates parasympathetic stimulation of synaptotagmin-7 (Syt7)-dependent insulin release. Mechanistically, vagal stimulation and activation of muscarinic acetylcholine receptors triggers Gαq-PLC-PKC-PKD-dependent signalling and activates IP6K1, the 5-IP7 synthase. Whereas both 5-IP7 and its precursor IP6 compete with PIP2 for binding to Syt7, Ca2+ selectively binds 5-IP7 with high affinity, freeing Syt7 to enable fusion of insulin-containing vesicles with the cell membrane. β-cell-specific IP6K1 deletion diminishes insulin secretion and glucose clearance elicited by muscarinic stimulation, whereas mice carrying a phosphorylation-mimicking, hyperactive IP6K1 mutant display augmented insulin release, congenital hyperinsulinaemia and obesity. These phenotypes are absent in mice lacking Syt7. Our study proposes a new conceptual framework for inositol pyrophosphate physiology in which 5-IP7 acts as a GPCR second messenger at the interface between peripheral nervous system and metabolic organs, transmitting Gq-coupled GPCR stimulation to unclamp Syt7-dependent, and perhaps other, exocytotic events.
Keyphrases
- type diabetes
- induced apoptosis
- insulin resistance
- high fat diet induced
- metabolic syndrome
- glycemic control
- skeletal muscle
- heart rate variability
- mesenchymal stem cells
- blood glucose
- cell proliferation
- signaling pathway
- physical activity
- endoplasmic reticulum stress
- heart rate
- weight gain
- weight loss
- cell cycle arrest