Inhibition of soluble epoxide hydrolase augments astrocyte release of vascular endothelial growth factor and neuronal recovery after oxygen-glucose deprivation
Epoxyeicosatrienoic acids (EETs) are synthesized in astrocytes, and inhibitors of soluble epoxide hydrolase (sEH), which hydrolyzes EETs, reduce infarct volume in ischemic stroke. Astrocytes can release protective neurotrophic factors, such as vascular endothelial growth factor (VEGF). We found that addition of sEH inhibitors to rat cultured astrocytes immediately after oxygen-glucose deprivation (OGD) markedly increased VEGF concentration in the medium 48 h later and the effect was blocked by an EET antagonist. The sEH inhibitors increased EET concentrations to levels capable of increasing VEGF. When the sEH inhibitors were removed from the medium at 48 h, the increase in VEGF persisted for an additional 48 h. Neurons exposed to OGD and subsequently to astrocyte medium previously conditioned with OGD plus sEH inhibitors showed increased phosphorylation of their VEGF receptor-2, less TUNEL staining, and increased phosphorylation of Akt, which was blocked by a VEGF receptor-2 antagonist. Our findings indicate that sEH inhibitors, applied to cultured astrocytes after an ischemia-like insult, can increase VEGF secretion. The released VEGF then enhances Akt-enabled cell survival signaling in neurons through activation of VEGF receptor-2 leading to less neuronal cell death. These results suggest a new strategy by which astrocytes can be leveraged to support neuroprotection.
基金:
Chinese Scholarship Council; National Natural Science Foundation of China [81600965]; NIH [NS060703, NS038684, U54 NS079202, HL033833, HL092105, HL105997]; NIEHS [R01 ES002710]; Superfund Research Program grant [P42 ES004699]; NIH/NIEHS Pathway to Independence Award [K99 ES024806]; Veterans Administration Research Career Scientist Award
第一作者单位:[1]Johns Hopkins Univ, Dept Anesthesiol & Crit Care Med, Baltimore, MD USA[2]Huazhong Univ Sci & Technol, Dept Anesthesiol, Tongji Hosp, Tongji Med Coll, Wuhan, Peoples R China
通讯作者:
通讯机构:[1]Johns Hopkins Univ, Dept Anesthesiol & Crit Care Med, Baltimore, MD USA[*1]Johns Hopkins Med Inst, Dept Anesthesiol & Crit Care Med, 600 North Wolfe St, Baltimore, MD 21287 USA
推荐引用方式(GB/T 7714):
Zhang Yue,Hong Gina,Lee Kin Sing Stephen,et al.Inhibition of soluble epoxide hydrolase augments astrocyte release of vascular endothelial growth factor and neuronal recovery after oxygen-glucose deprivation[J].JOURNAL OF NEUROCHEMISTRY.2017,140(5):814-825.doi:10.1111/jnc.13933.
APA:
Zhang, Yue,Hong, Gina,Lee, Kin Sing Stephen,Hammock, Bruce D.,Gebremedhin, Debebe...&Sapirstein, Adam.(2017).Inhibition of soluble epoxide hydrolase augments astrocyte release of vascular endothelial growth factor and neuronal recovery after oxygen-glucose deprivation.JOURNAL OF NEUROCHEMISTRY,140,(5)
MLA:
Zhang, Yue,et al."Inhibition of soluble epoxide hydrolase augments astrocyte release of vascular endothelial growth factor and neuronal recovery after oxygen-glucose deprivation".JOURNAL OF NEUROCHEMISTRY 140..5(2017):814-825