All three IP3 receptor subtypes generate Ca2+ puffs, the universal building blocks of IP3-evoked Ca2+ signals

被引:36
作者
Mataragka, Stefania [1 ]
Taylor, Colin W. [1 ]
机构
[1] Univ Cambridge, Dept Pharmacol, Tennis Court Rd, Cambridge CB2 1PD, England
基金
英国生物技术与生命科学研究理事会; 英国惠康基金;
关键词
Ca2+ puff; Endoplasmic reticulum; IP3 receptor subtype; Total internal reflection fluorescence microscopy; CHANNEL ACTIVITY; SITES; LOCALIZATION; EXPRESSION; TYPE-2; CELLS;
D O I
10.1242/jcs.220848
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
All three subtypes of inositol 1,4,5-trisphosphate receptor (IP3R) are intracellular Ca2+ channels that are co-regulated by IP3 and Ca2+. This allows IP3Rs to evoke regenerative Ca2+ signals, the smallest of which are Ca2+ puffs that reflect the coordinated opening of a few clustered IP(3)Rs. We use total internal reflection microscopy (TIRF) microscopy to record Ca2+ signals in HEK cells expressing all three IP3R subtypes or a single native subtype. Ca2+ puffs are less frequent in cells expressing one IP3R subtype, commensurate with them expressing fewer IP(3)Rs than wild-type cells. However, all three IP3R subtypes generate broadly similar Ca2+ puffs with similar numbers of IP(3)Rs contributing to each. This suggests that IP3R clusters may be assembled by conserved mechanisms that generate similarly sized clusters across different IP3R expression levels. The Ca2+ puffs evoked by IP(3)R2 had slower kinetics and more prolonged durations, which may be due to IP3 binding with greater affinity to IP(3)R2. We conclude that Ca2+ puffs are the building blocks for the Ca2+ signals evoked by all IP(3)Rs.
引用
收藏
页数:7
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