Shandong University, Department of Neurology, Shandong Provincial Hospital, Jinan, China.
Department of Neurology, Shouguang Hospital of T.C.M, Shouguang, China.
Cell Death Dis. 2023 Oct 7;14(10):654. doi: 10.1038/s41419-023-06176-2.
The current study explores the potential function and the underlying mechanisms of endothelial cell-derived R-spondin 3 (RSPO3) neuroprotection against ischemia/reperfusion-induced neuronal cell injury. In both neuronal cells (Neuro-2a) and primary murine cortical neurons, pretreatment with RSPO3 ameliorated oxygen and glucose deprivation (OGD)/re-oxygenation (OGD/R)-induced neuronal cell death and oxidative injury. In neurons RSPO3 activated the Akt, Erk and β-Catenin signaling cascade, but only Erk inhibitors reversed RSPO3-induced neuroprotection against OGD/R. In mouse embryonic fibroblasts (MEFs) and neuronal cells, RSPO3-induced LGR4-Gab1-Gαi1/3 association was required for Erk activation, and either silencing or knockout of Gαi1 and Gαi3 abolished RSPO3-induced neuroprotection. In mice, middle cerebral artery occlusion (MCAO) increased RSPO3 expression and Erk activation in ischemic penumbra brain tissues. Endothelial knockdown or knockout of RSPO3 inhibited Erk activation in the ischemic penumbra brain tissues and increased MCAO-induced cerebral ischemic injury in mice. Conversely, endothelial overexpression of RSPO3 ameliorated MCAO-induced cerebral ischemic injury. We conclude that RSPO3 activates Gαi1/3-Erk signaling to protect neuronal cells from ischemia/reperfusion injury.
本研究探讨了内皮细胞衍生的 R- 脊椎蛋白 3(RSPO3)对缺血/再灌注诱导的神经元细胞损伤的神经保护作用及其潜在机制。在神经元细胞(Neuro-2a)和原代小鼠皮质神经元中,RSPO3 预处理可改善氧葡萄糖剥夺(OGD)/复氧(OGD/R)诱导的神经元细胞死亡和氧化损伤。在神经元中,RSPO3 激活 Akt、Erk 和 β-连环蛋白信号级联,但只有 Erk 抑制剂可逆转 RSPO3 诱导的对 OGD/R 的神经保护作用。在小鼠胚胎成纤维细胞(MEFs)和神经元细胞中,RSPO3 诱导的 LGR4-Gab1-Gαi1/3 缔合是 Erk 激活所必需的,而 Gαi1 和 Gαi3 的沉默或敲除则消除了 RSPO3 诱导的神经保护作用。在小鼠中,大脑中动脉闭塞(MCAO)增加了缺血半影脑组织中 RSPO3 的表达和 Erk 的激活。内皮细胞 RSPO3 的敲低或敲除抑制了缺血半影脑组织中的 Erk 激活,并增加了 MCAO 诱导的小鼠脑缺血损伤。相反,内皮细胞 RSPO3 的过表达改善了 MCAO 诱导的脑缺血损伤。我们的结论是,RSPO3 通过激活 Gαi1/3-Erk 信号通路来保护神经元细胞免受缺血/再灌注损伤。