Blockade of soluble epoxide hydrolase attenuates post-ischemic neuronal hyperexcitation and confers resilience against stroke with TrkB activation

Inhibition and deletion of soluble epoxide hydrolase (sEH) has been suggested to ameliorate infarction in experimental ischemic stroke possibly via vasoactive epoxyeicosatrienoic acids. However, it is unknown whether the neuroprotective mechanisms involve alteration of post-ischemic neuronal transmi...

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Veröffentlicht in:Scientific reports 2018-01, Vol.8 (1), p.118-118, Article 118
Hauptverfasser: Chang, Li-Hsin, Lin, Hui-Ching, Huang, Shiang-Suo, Chen, I-Chih, Chu, Kai-Wen, Chih, Chun-Lien, Liang, Yao-Wen, Lee, Yi-Chung, Chen, You-Yin, Lee, Yi-Hsuan, Lee, I-Hui
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container_title Scientific reports
container_volume 8
creator Chang, Li-Hsin
Lin, Hui-Ching
Huang, Shiang-Suo
Chen, I-Chih
Chu, Kai-Wen
Chih, Chun-Lien
Liang, Yao-Wen
Lee, Yi-Chung
Chen, You-Yin
Lee, Yi-Hsuan
Lee, I-Hui
description Inhibition and deletion of soluble epoxide hydrolase (sEH) has been suggested to ameliorate infarction in experimental ischemic stroke possibly via vasoactive epoxyeicosatrienoic acids. However, it is unknown whether the neuroprotective mechanisms involve alteration of post-ischemic neuronal transmission and neurotrophic signaling. We used a permanent middle cerebral artery occlusion (MCAO) model in adult wild-type mice with the sEH inhibitor 12-(3-adamantan-1-yl-ureido)dodecanoic acid (AUDA) post-treatment and in sEH knockout (sEH KO) mice. We found that sensorimotor recovery was significantly enhanced after MCAO in both AUDA-treated and sEH KO mice, with decreased sEH activity and brain infarction. Decreased post-ischemic long-term potentiation (iLTP) was observed in an ex vivo hippocampal oxygen-glucose deprivation model. Tropomyosin receptor kinase B (TrkB) activation, rather than glutamate receptor alteration, was consistently found after the different manipulations. Immunohistochemistry further revealed peri-infarct neuronal TrkB activation and microvasculature augmentation in AUDA-treated and sEH KO mice, suggesting parallel neurovascular enhancement. Mechanistically, pretreatment with a selective TrkB antagonist ANA12 countered the effect of iLTP attenuation induced by sEH deletion ex vivo and abolished the infarct reduction in vivo . Together, the neuroprotective effects of sEH inhibition and gene deletion can both be mediated partially via enhancement of TrkB signaling which attenuated post-ischemic neuroexcitation and neurological deficits.
doi_str_mv 10.1038/s41598-017-18558-6
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However, it is unknown whether the neuroprotective mechanisms involve alteration of post-ischemic neuronal transmission and neurotrophic signaling. We used a permanent middle cerebral artery occlusion (MCAO) model in adult wild-type mice with the sEH inhibitor 12-(3-adamantan-1-yl-ureido)dodecanoic acid (AUDA) post-treatment and in sEH knockout (sEH KO) mice. We found that sensorimotor recovery was significantly enhanced after MCAO in both AUDA-treated and sEH KO mice, with decreased sEH activity and brain infarction. Decreased post-ischemic long-term potentiation (iLTP) was observed in an ex vivo hippocampal oxygen-glucose deprivation model. Tropomyosin receptor kinase B (TrkB) activation, rather than glutamate receptor alteration, was consistently found after the different manipulations. Immunohistochemistry further revealed peri-infarct neuronal TrkB activation and microvasculature augmentation in AUDA-treated and sEH KO mice, suggesting parallel neurovascular enhancement. Mechanistically, pretreatment with a selective TrkB antagonist ANA12 countered the effect of iLTP attenuation induced by sEH deletion ex vivo and abolished the infarct reduction in vivo . 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Mechanistically, pretreatment with a selective TrkB antagonist ANA12 countered the effect of iLTP attenuation induced by sEH deletion ex vivo and abolished the infarct reduction in vivo . 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However, it is unknown whether the neuroprotective mechanisms involve alteration of post-ischemic neuronal transmission and neurotrophic signaling. We used a permanent middle cerebral artery occlusion (MCAO) model in adult wild-type mice with the sEH inhibitor 12-(3-adamantan-1-yl-ureido)dodecanoic acid (AUDA) post-treatment and in sEH knockout (sEH KO) mice. We found that sensorimotor recovery was significantly enhanced after MCAO in both AUDA-treated and sEH KO mice, with decreased sEH activity and brain infarction. Decreased post-ischemic long-term potentiation (iLTP) was observed in an ex vivo hippocampal oxygen-glucose deprivation model. Tropomyosin receptor kinase B (TrkB) activation, rather than glutamate receptor alteration, was consistently found after the different manipulations. Immunohistochemistry further revealed peri-infarct neuronal TrkB activation and microvasculature augmentation in AUDA-treated and sEH KO mice, suggesting parallel neurovascular enhancement. Mechanistically, pretreatment with a selective TrkB antagonist ANA12 countered the effect of iLTP attenuation induced by sEH deletion ex vivo and abolished the infarct reduction in vivo . Together, the neuroprotective effects of sEH inhibition and gene deletion can both be mediated partially via enhancement of TrkB signaling which attenuated post-ischemic neuroexcitation and neurological deficits.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>29311641</pmid><doi>10.1038/s41598-017-18558-6</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0002-5344-6685</orcidid><oa>free_for_read</oa></addata></record>
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subjects 13/1
13/51
14/19
631/378/1689/534
631/378/2607
64/60
82/80
9/30
Animals
Cerebral blood flow
Cerebral Cortex - blood supply
Cerebral Cortex - metabolism
Cerebral Cortex - pathology
Cerebral infarction
Disease Models, Animal
Enzyme Activation
Epoxide hydrolase
Epoxide Hydrolases - antagonists & inhibitors
Epoxide Hydrolases - deficiency
Excitatory Postsynaptic Potentials
Gene Deletion
Glucose
Glutamic acid receptors
Hippocampus
Hippocampus - metabolism
Humanities and Social Sciences
Immunohistochemistry
Ischemia
Long-term potentiation
Male
Membrane Glycoproteins - metabolism
Mice
Mice, Knockout
Microvasculature
Motor Activity
multidisciplinary
Neurological diseases
Neurons - metabolism
Neuroprotection
Neuroprotective Agents
Oxygen
Protein-Tyrosine Kinases - metabolism
Psychomotor Performance
Rodents
Science
Science (multidisciplinary)
Sensorimotor system
Staphylococcal enterotoxin H
Stroke
Stroke - etiology
Stroke - metabolism
Stroke - physiopathology
Synaptic Transmission
TrkB receptors
Tropomyosin
Vasoactive agents
title Blockade of soluble epoxide hydrolase attenuates post-ischemic neuronal hyperexcitation and confers resilience against stroke with TrkB activation
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