14-3-3γ mediates the long-term inhibition of peripheral kappa opioid receptor antinociceptive signaling by norbinaltorphimine.

14-3-3γ mediates the long-term inhibition of peripheral kappa opioid receptor antinociceptive signaling by norbinaltorphimine.
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14-3-3γ 介导norbinaltorphimine 对外周kappa 阿片受体抗伤害信号传导的长期抑制。

DOI:
10.1016/j.neuropharm.2022.109251
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发表时间:
2022
期刊:
影响因子:
4.7
通讯作者:
Clarke,WilliamP
Clarke,WilliamP
中科院分区:
医学2区
文献类型:
--
作者:
Wedemeyer,MichaelJ;Jennings,ElaineM;Smith,HudsonR;Chavera,TeresaS;Jamshidi,RaehannahJ;Berg,KellyA;Clarke,WilliamP

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长期抑制外周痛感受神经元中的κ阿片受体(KOR)信号是开发产生镇痛的外周限制性KOR激动剂的潜在障碍。这种长期抑制机制是由单次注射KOR拮抗剂norbinaltorphimine(norBNI)后c-Jun N-末端激酶(JNK)的激活引起的。这种效应需要外周痛觉神经元中未知介质的蛋白质合成。使用2D差示凝胶电泳和串联质谱,我们发现norBNI激活JNK后,外周感觉神经元中支架蛋白14-3-3γ上调。通过siRNA敲低14-3-3γ消除了培养的外周感觉神经元中norBNI对KOR介导的cAMP信号传导的长期减少。类似地,在大鼠后爪中敲低14-3-3γ消除了norBNI介导的外周KOR介导的抗伤害感受的长期降低。此外,14-3-3γ在表达KOR的CHO细胞中的过表达阻止了KOR介导的cAMP信号传导抑制。这些长期效应对KOR具有选择性,因为未观察到其他受体系统的异源调节。这些数据表明,14-3-3γ是norBNI在外周感觉神经元中长期抑制KOR的必要和充分条件。
Long-term inhibition of kappa opioid receptor (KOR) signaling in peripheral pain-sensing neurons is a potential obstacle for development of peripherally-restricted KOR agonists that produce analgesia. Such a long-term inhibitory mechanism is invoked from activation of c-Jun N-terminal kinase (JNK) that follows a single injection of the KOR antagonist norbinaltorphimine (norBNI). This effect requires protein synthesis of an unknown mediator in peripheral pain-sensing neurons. Using 2D difference gel electrophoresis with tandem mass spectrometry, we have identified that the scaffolding protein 14-3-3γ is upregulated in peripheral sensory neurons following activation of JNK with norBNI. Knockdown of 14-3-3γ by siRNA eliminates the long-term reduction in KOR-mediated cAMP signaling by norBNI in peripheral sensory neurons in culture. Similarly, knockdown of 14-3-3γ in the rat hind paw abolished the norBNI-mediated long-term reduction in peripheral KOR-mediated antinociception. Further, overexpression of 14-3-3γ in KOR expressing CHO cells prevented KOR-mediated inhibition of cAMP signaling. These long-term effects are selective for KOR as heterologous regulation of other receptor systems was not observed. These data suggest that 14-3-3γ is both necessary and sufficient for the long-term inhibition of KOR by norBNI in peripheral sensory neurons.
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DOI: --
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期刊:
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期刊: Brain research
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