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4-chloro-orto-cresol activates ryanodine receptor more selectively and potently than 4-chloro-meta-cresol.
Cell Calcium ( IF 4.3 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.ceca.2020.102213
Mariann Skaliczki 1 , Balázs Lukács 2 , Zsuzsanna É Magyar 2 , Tünde Kovács 2 , Miklós Bárdi 2 , Szabolcs Novák 2 , Gyula Diszházi 2 , Sándor Sárközi 2 , Ildikó Márton 3 , Judit Péli-Szabó 4 , István Jóna 5 , Péter Nánási 6 , János Almássy 2
Affiliation  

In this study we performed the comprehensive pharmacological analysis of two stereoisomers of 4-chloro-meta-cresol (4CMC), a popular ryanodine receptor (RyR) agonist used in muscle research. Experiments investigating the Ca2+-releasing action of the isomers demonstrated that the most potent isomer was 4-chloro-orto-cresol (4COC) (EC50 = 55 ± 14 μM), although 3-chloro-para-cresol (3CPC) was more effective, as it was able to induce higher magnitude of Ca2+ flux from isolated terminal cisterna vesicles. Nevertheless, 3CPC stimulated the hydrolytic activity of the sarcoplasmic reticulum ATP-ase (SERCA) with an EC50 of 91 ± 17 μM, while 4COC affected SERCA only in the millimolar range (IC50 = 1370 ± 88 μM). IC50 of 4CMC for SERCA pump was 167 ± 8 μM, indicating that 4CMC is not a specific RyR agonist either, as it activated RyR in a similar concentration (EC50 = 121 ± 20 μM). Our data suggest that the use of 4COC might be more beneficial than 4CMC in experiments, when Ca2+ release should be triggered through RyRs without influencing SERCA activity.

中文翻译:

4-氯-邻甲酚比4-氯-间甲酚更有选择性和更有效地激活兰尼碱受体。

在这项研究中,我们对 4-氯间甲酚 (4CMC) 的两种立体异构体进行了综合药理学分析,这是一种用于肌肉研究的流行兰尼碱受体 (RyR) 激动剂。研究异构体释放 Ca2+ 作用的实验表明,最有效的异构体是 4-氯-邻甲酚 (4COC) (EC50 = 55 ± 14 μM),尽管 3-氯-对甲酚 (3CPC) 更有效,因为它能够从孤立的终末池小泡诱导更高量级的 Ca2+ 通量。尽管如此,3CPC 以 91 ± 17 μM 的 EC50 刺激肌质网 ATP 酶(SERCA)的水解活性,而 4COC 仅在毫摩尔范围内影响 SERCA(IC50 = 1370 ± 88 μM)。4CMC 对 SERCA 泵的 IC50 为 167 ± 8 μM,表明 4CMC 也不是特定的 RyR 激动剂,因为它以相似的浓度激活 RyR (EC50 = 121 ± 20 μM)。我们的数据表明,在实验中使用 4COC 可能比 4CMC 更有益,此时应通过 RyRs 触发 Ca2+ 释放而不影响 SERCA 活性。
更新日期:2020-05-01
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