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The ryanodine receptor agonist 4-chloro-3-ethylphenol blocks ORAI store-operated channels.

Zeng, B, Chen, GL, Daskoulidou, N and Xu, SZ (2014) The ryanodine receptor agonist 4-chloro-3-ethylphenol blocks ORAI store-operated channels. Br J Pharmacol, 171 (5). pp. 1250-1259.

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BACKGROUND: Depletion of the Ca(2+) store by ryanodine receptor (RyR) agonists induces store-operated Ca(2+) entry (SOCE). 4-Chloro-3-ethylphenol (4-CEP) and 4-chloro-m-cresol (4-CmC) are RyR agonists commonly used as research tools and diagnostic reagents for malignant hyperthermia. Here, we investigated the effects of 4-CEP and its analogues on SOCE. EXPERIMENTAL APPROACH: SOCE and ORAI1-3 currents were recorded by Ca(2+) imaging and whole-cell patch recordings in rat L6 myoblasts and in HEK293 cells overexpressing STIM1/ORAI1-3. KEY RESULTS: 4-CEP induced a significant release of Ca(2+) in rat L6 myoblasts, but inhibited SOCE. The inhibitory effect was concentration-dependent and more potent than its analogues 4-CmC and 4-chlorophenol (4-ClP). In the HEK293 T-REx cells overexpressing STIM1/ORAI1-3, 4-CEP inhibited the ORAI1, ORAI2 and ORAI3 currents evoked by thapsigargin. The 2-APB-induced ORAI3 current was also blocked by 4-CEP. This inhibitory effect was reversible and independent of the Ca(2+) release. The two analogues, 4-CmC and 4-ClP, also inhibited the ORAI1-3 channels. Excised patch and intracellular application of 4-CEP demonstrated that the action site was located extracellularly. Moreover, 4-CEP evoked STIM1 translocation and subplasmalemmal clustering through its Ca(2+) store-depleting effect via the activation of RyR, but no effect on STIM1 redistribution was observed in cells co-expressing STIM1/ORAI1-3. CONCLUSION AND IMPLICATIONS: 4-CEP not only acts as a RyR agonist to deplete the Ca(2+) store and trigger STIM1 subplasmalemmal translocation and clustering, but also directly inhibits ORAI1-3 channels. These findings demonstrate a novel pharmacological property for the chlorophenol derivatives that act as RyR agonists.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Zeng, B
Chen, GL
Xu, SZ
Date : March 2014
DOI : 10.1111/bph.12528
Uncontrolled Keywords : 4-chloro-3-ethylphenol, 4-chloro-m-cresol, ORAI, STIM1, ryanodine receptors, store-operated Ca2+ channels, Animals, Calcium, Calcium Channel Agonists, Calcium Channels, Cell Line, Chlorophenols, Cresols, HEK293 Cells, Humans, Membrane Proteins, Neoplasm Proteins, Rats, Ryanodine Receptor Calcium Release Channel
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 10:28
Last Modified : 24 Jan 2020 19:24

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