The orexin 1 receptor modulates kappa opioid receptor function via a JNK-dependent mechanism.

The orexin 1 receptor modulates kappa opioid receptor function via a JNK-dependent mechanism.
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食欲素 1 受体通过 JNK 依赖性机制调节 kappa 阿片受体功能。

DOI:
10.1016/j.cellsig.2015.03.026
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发表时间:
2015
影响因子:
4.8
通讯作者:
McDonald,PatriciaH
McDonald,PatriciaH
中科院分区:
生物学2区
文献类型:
--
作者:
Robinson,JamesD;McDonald,PatriciaH

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食欲素1受体(OX1R)和κ阿片受体(KOR)是两种G蛋白偶联受体(GPCR),以前被证明在调节滥用药物(如可卡因)的奖励效应中起重要作用。使用异源表达两种受体的细胞,我们研究了OX1R是否可以调节KOR的功能,反之亦然。发现OX1R的激活减弱激动剂激活的KOR介导的cAMP产生抑制。相反,激动剂激活的KOR介导的β-arrestin募集和p38激活在激活的OX1R存在下增强。这些作用是独立的OX1R内化,但在JNK抑制剂SP-600125的存在下被阻断。OX1R信号传导不影响KOR的配体结合。综上所述,这些数据表明OX1R信号可以以JNK依赖性方式调节KOR功能,促进KOR通过β-arrestin/p38而不是G α i的优先信号传导。相反,OX1R的G α q偶联不受KOR激活的影响,表明这种串扰是单向的。鉴于KOR G α i介导的信号传导事件和β-抑制蛋白介导的信号传导事件被认为促进KOR激活下游的不同细胞应答和生理结果,该机制可能对KOR活性的行为效应具有重要意义。
The orexin 1 receptor (OX1R) and the kappa opioid receptor (KOR) are two G protein-coupled receptors (GPCRs) previously demonstrated to play important roles in modulating the rewarding effects of drugs of abuse such as cocaine. Using cells heterologously expressing both receptors, we investigated whether OX1R can regulate the function of KOR and vice versa. Activation of OX1R was found to attenuate agonist-activated KOR-mediated inhibition of cAMP production. In contrast, agonist-activated KOR-mediated β-arrestin recruitment and p38 activation were enhanced in the presence of activated OX1R. These effects are independent of OX1R internalization but are blocked in the presence of the JNK inhibitor SP-600125. OX1R signaling does not affect ligand binding by KOR. Taken together, these data suggest that OX1R signaling can modulate KOR function in a JNK-dependent manner, promoting preferential signaling of KOR via β-arrestin/p38 rather than Gαi. Conversely, Gαq coupling of OX1R is unaffected by activation of KOR, suggesting that this crosstalk is unidirectional. Given that KOR Gαi-mediated signaling events and β-arrestin-mediated signaling events are thought to promote distinct cellular responses and physiological outcomes downstream of KOR activation, this mechanism may have important implications on the behavioral effects of KOR activity.
DOI: 10.1016/0005-2736(79)90412-7
发表时间: --
期刊: --
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PKA 和 ERK1/2 参与多巴胺 Dα 受体诱导的 δ 阿片受体异源脱敏。
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发表时间: 2013
期刊: Life sciences
影响因子: 6.1
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期刊: SCIENCE SIGNALING
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