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Articles, Cellular/Molecular

Repeated Stress Dysregulates κ-Opioid Receptor Signaling in the Dorsal Raphe through a p38α MAPK-Dependent Mechanism

Julia C. Lemos, Clarisse A. Roth, Daniel I. Messinger, Harminder K. Gill, Paul E. M. Phillips and Charles Chavkin
Journal of Neuroscience 5 September 2012, 32 (36) 12325-12336; https://doi.org/10.1523/JNEUROSCI.2053-12.2012
Julia C. Lemos
1Departments of Pharmacology and
2Psychiatry and Behavioral Sciences, and
3Program in Neurobiology and Behavior, University of Washington, Seattle, Washington 98195
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Clarisse A. Roth
2Psychiatry and Behavioral Sciences, and
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Daniel I. Messinger
1Departments of Pharmacology and
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Harminder K. Gill
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Paul E. M. Phillips
1Departments of Pharmacology and
2Psychiatry and Behavioral Sciences, and
3Program in Neurobiology and Behavior, University of Washington, Seattle, Washington 98195
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Charles Chavkin
1Departments of Pharmacology and
3Program in Neurobiology and Behavior, University of Washington, Seattle, Washington 98195
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Abstract

Repeated stress releases dynorphins and causes subsequent activation of κ-opioid receptors (KORs) in limbic brain regions. The serotonergic dorsal raphe nucleus (DRN) has previously been found to be an important site of action for the dysphoric effects of dynorphin-κ-opioid receptor system activation during stress-evoked behaviors, and KOR-induced activation of p38α mitogen-activated protein kinase (MAPK) in serotonergic neurons was found to be a critical mediator of the aversive properties of stress. Yet, how dynorphins and KORs functionally regulate the excitability of serotonergic DRN neurons both in adaptive and pathological stress states is poorly understood. Here we report that acute KOR activation by the selective agonist U69,593 [(+)-(5α,7α,8β)-N-methyl-N-[7-(1-pyrrolidinyl)-1-oxaspiro[4.5]dec-8-yl]benzeneacetamide] inhibits serotonergic neuronal excitability within the DRN through both presynaptic inhibition of excitatory synaptic transmission and postsynaptic activation of G-protein-gated inwardly rectifying potassium channels (GIRKs) electrophysiologically recorded in brain slices. C57BL/6 mice subjected to repeated swim, stress sessions had significantly reduced KOR-mediated GIRK currents recorded in serotonergic neurons in DRN postsynaptically, without significantly affecting presynaptic KOR-mediated regulation of excitatory transmission. This effect was blocked by genetic excision of p38α MAPK selectively from serotonergic neurons. An increase in phospho-immunoreactivity suggests that this functional dysregulation may be a consequence of tyrosine phosphorylation of GIRK (KIR3.1) channels. These data elucidate a mechanism for stress-induced dysregulation of the excitability of neurons in the DRN and identify a functional target of stress-induced p38α MAPK activation that may underlie some of the negative effects of pathological stress exposure.

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The Journal of Neuroscience: 32 (36)
Journal of Neuroscience
Vol. 32, Issue 36
5 Sep 2012
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Repeated Stress Dysregulates κ-Opioid Receptor Signaling in the Dorsal Raphe through a p38α MAPK-Dependent Mechanism
Julia C. Lemos, Clarisse A. Roth, Daniel I. Messinger, Harminder K. Gill, Paul E. M. Phillips, Charles Chavkin
Journal of Neuroscience 5 September 2012, 32 (36) 12325-12336; DOI: 10.1523/JNEUROSCI.2053-12.2012

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Repeated Stress Dysregulates κ-Opioid Receptor Signaling in the Dorsal Raphe through a p38α MAPK-Dependent Mechanism
Julia C. Lemos, Clarisse A. Roth, Daniel I. Messinger, Harminder K. Gill, Paul E. M. Phillips, Charles Chavkin
Journal of Neuroscience 5 September 2012, 32 (36) 12325-12336; DOI: 10.1523/JNEUROSCI.2053-12.2012
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