Abstract:
:Recent studies implicate melatonin in the antinociceptive activity of sensory neurons. However, the underlying mechanisms are still largely unknown. Here, we identify a critical role of melatonin in functionally regulating Cav3.2 T-type Ca2+ channels (T-type channel) in trigeminal ganglion (TG) neurons. Melatonin inhibited T-type channels in small TG neurons via the melatonin receptor 2 (MT2 receptor) and a pertussis toxin-sensitive G-protein pathway. Immunoprecipitation analyses revealed that the intracellular subunit of the MT2 receptor coprecipitated with Gαo . Both shRNA-mediated knockdown of Gαo and intracellular application of QEHA peptide abolished the inhibitory effects of melatonin. Protein kinase C (PKC) antagonists abolished the melatonin-induced T-type channel response, whereas inhibition of conventional PKC isoforms elicited no effect. Furthermore, application of melatonin increased membrane abundance of PKC-eta (PKCη ) while antagonism of PKCη or shRNA targeting PKCη prevented the melatonin-mediated effects. In a heterologous expression system, activation of MT2 receptor strongly inhibited Cav3.2 T-type channel currents but had no effect on Cav3.1 and Cav3.3 current amplitudes. The selective Cav3.2 response was PKCη dependent and was accompanied by a negative shift in the steady-state inactivation curve. Furthermore, melatonin decreased the action potential firing rate of small TG neurons and attenuated the mechanical hypersensitivity in a mouse model of complete Freund's adjuvant-induced inflammatory pain. These actions were inhibited by T-type channel blockade. Together, our results demonstrated that melatonin inhibits Cav3.2 T-type channel activity through the MT2 receptor coupled to novel Gβγ -mediated PKCη signaling, subsequently decreasing the membrane excitability of TG neurons and pain hypersensitivity in mice.
journal_name
J Pineal Resjournal_title
Journal of pineal researchauthors
Zhang Y,Ji H,Wang J,Sun Y,Qian Z,Jiang X,Snutch TP,Sun Y,Tao Jdoi
10.1111/jpi.12476subject
Has Abstractpub_date
2018-05-01 00:00:00pages
e12476issue
4eissn
0742-3098issn
1600-079Xjournal_volume
64pub_type
杂志文章abstract::Melatonin, a major pineal secretory product, exerts a range of physiological and neuroprotective effects. However, the functional significance of melatonin in determining neural identity, and the mechanisms by which this may occur, is unknown. In this study, P19 cells were used as a model system and cell behavior was ...
journal_title:Journal of pineal research
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
pub_type: 杂志文章
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2012.00976.x
更新日期:2012-08-01 00:00:00
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journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1995.tb00151.x
更新日期:1995-04-01 00:00:00
abstract::The oncostatic effects of melatonin on the mammary gland have been studied in transgenic mice carrying the N-ras proto-oncogene under the control of the MMTV-LTR. Female (4-week-old) virgin mice with positive transgenic pedigrees were injected with melatonin (200 micrograms/mouse/ day, five times a week) or vehicle la...
journal_title:Journal of pineal research
pub_type: 杂志文章
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journal_title:Journal of pineal research
pub_type: 杂志文章
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journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2004.00199.x
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journal_title:Journal of pineal research
pub_type: 杂志文章
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/jpi.12542
更新日期:2019-03-01 00:00:00
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journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1989.tb00911.x
更新日期:1989-01-01 00:00:00
abstract::Melatonin, the major secretory product of the pineal gland, is in focus of many research areas because of its ability to scavenge free oxygen radicals and thereby protect cells and tissues from radical damage. Some studies suggest melatonin may be a possible therapeutic agent with potential clinical applications again...
journal_title:Journal of pineal research
pub_type: 杂志文章
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
pub_type: 杂志文章
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abstract::Melatonin plays an important role in regulating circadian rhythms. It also acts as a potent antioxidant and regulates glucose and lipid metabolism, although the exact action mechanism is not clear. The α2-HS-glycoprotein gene (AHSG) and its protein, fetuin-A (FETUA), are one of the hepatokines and are known to be asso...
journal_title:Journal of pineal research
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更新日期:2018-09-01 00:00:00
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journal_title:Journal of pineal research
pub_type: 杂志文章
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journal_title:Journal of pineal research
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journal_title:Journal of pineal research
pub_type: 杂志文章
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journal_title:Journal of pineal research
pub_type: 杂志文章,评审
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