Journal
CELL CALCIUM
Volume 115, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceca.2023.102796
Keywords
IP3R; SOCE; STIM-Orai coupling; Neuronal Ca(2+)signaling; ER-PM junctions
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The endoplasmic reticulum (ER) is crucial for cellular calcium signaling, with IP3R channels playing a key role in regulating calcium levels. Recent research has uncovered a previously overlooked function of IP3R1 in neurons, showing its involvement in supporting STIM/Orai-mediated store-operated calcium entry (SOCE).
The endoplasmic reticulum (ER) has long been recognized as the master regulator of cellular Ca2+ signaling. In this context, IP3R channels may be envisioned as this conductor's baton, which enables virtuous orchestration of cellular Ca(2+ )signaling tunes. IP(3)Rs serve the generation of spatiotemporally defined Ca2+ changes and are key for the ER ' s function as an autonomous Ca2+ signaling unit, which is able to govern its own refilling from the extracellular Ca2+ pool. As yet, IP3R signaling has been primarily attributed to its precisely-tunable Ca2+ channel function and IP3-mediated control over Ca2+ levels within signaling domains. A recent report from the Hasan laboratory [1] provides evidence for an as yet overlooked function of IP(3)R1 in terms of supporting STIM/Oraimediated SOCE in neurons. IP(3)R1 is demonstrated to remarkably facilitate productive STIM-Orai interactions and SOCE by a process that is triggered by IP3 but independent of the receptors' function as an ER Ca2+ channel.
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