Calcium influx into neurons triggers neuronal death during cerebral ischemia/reperfusion injury.Various calcium channels are involved in cerebral ischemia/reperfusion injury.Cav3.2 channel is a main subtype of T-type ...Calcium influx into neurons triggers neuronal death during cerebral ischemia/reperfusion injury.Various calcium channels are involved in cerebral ischemia/reperfusion injury.Cav3.2 channel is a main subtype of T-type calcium channels.T-type calcium channel blockers,such as pimozide and mibefradil,have been shown to prevent cerebral ischemia/reperfusion injury-induced brain injury.However,the role of Cav3.2 channels in cerebral ischemia/reperfusion injury remains unclear.Here,in vitro and in vivo models of cerebral ischemia/reperfusion injury were established using middle cerebral artery occlusion in mice and high glucose hypoxia/reoxygenation exposure in primary hippocampal neurons.The results showed that Cav3.2 expression was significantly upregulated in injured hippocampal tissue and primary hippocampal neurons.We further established a Cav3.2 gene-knockout mouse model of cerebral ischemia/reperfusion injury.Cav3.2 knockout markedly reduced infarct volume and brain water content,and alleviated neurological dysfunction after cerebral ischemia/reperfusion injury.Additionally,Cav3.2 knockout attenuated cerebral ischemia/reperfusion injury-induced oxidative stress,inflammatory response,and neuronal apoptosis.In the hippocampus of Cav3.2-knockout mice,calcineurin overexpression offset the beneficial effect of Cav3.2 knockout after cerebral ischemia/reperfusion injury.These findings suggest that the neuroprotective function of Cav3.2 knockout is mediated by calcineurin/nuclear factor of activated T cells 3 signaling.Findings from this study suggest that Cav3.2 could be a promising target for treatment of cerebral ischemia/reperfusion injury.展开更多
Objective:To investigate the mechanism of long non-coding RNA-LINC00662 on induction of sorafenib resistance in hepatocellular carcinoma(HCC)cells.Methods:HCC cells(HepG2,HCCLM3),sorafenib-resistant hepatocellular car...Objective:To investigate the mechanism of long non-coding RNA-LINC00662 on induction of sorafenib resistance in hepatocellular carcinoma(HCC)cells.Methods:HCC cells(HepG2,HCCLM3),sorafenib-resistant hepatocellular carcinoma cells HCC-SR(HepG2-SR,HCCLM3-SR)were investigated by real-time fluorescence quantitative polymerase chain reaction(RT-qPCR)and Western blot was used to detect LINC00662,miR-106a-5p and cavitin-1(CAV1)expression in each group of cells.106a-5p and cavitin-1(CAV1)expression levels were measured by RT-qPCR and Western blot.The si-LINC00662 and miR-106a-5p mimics were transfected with HCC-SR cells,respectively,and cell sensitivity to sorafenib drug was detected by cell activity kit(CCK-8).And the targeting relationship between LINC00662 and miR-106a-5p,miR-106a-5p and CAV1 was further determined by dual luciferase reporter assay,RT-qPCR,and Western blot.Results:The relative expression of LINC00662 and CAV1 was significantly increased and miR-106a-5p expression was significantly decreased in HCC-SR cells(P<0.01,P<0.001);interference with LINC00662 expression or overexpression of miR-106a-5p significantly increased the sensitivity of HCC-SR cells to sorafenib drug(P<0.05,P<0.01).And LINC00662 targeted to negatively regulate miR-106a-5p expression and miR-106a-5p targeted to negatively regulate CAV1 expression(P<0.05).Conclusion:LINC00662 could act as a competitive endogenous RNA(ceRNA)of miR-106a-5p to promote the expression of CAV1 and mediate the resistance of sorafenib in HCC cells.Interfering with LINC00662 expression can inhibit sorafenib resistance and increase sorafenib drug sensitivity in HCC cells.展开更多
基金supported by the Natural Science Foundation of Anhui Province of China,No.2208085Y32Scientific Research Plan Project of Anhui Province of China,No.2022AH020076the Chen Xiao-Ping Foundation for the Development of Science and Technology of Hubei Province,No.CXPJJH12000005-07-115(all to CT).
文摘Calcium influx into neurons triggers neuronal death during cerebral ischemia/reperfusion injury.Various calcium channels are involved in cerebral ischemia/reperfusion injury.Cav3.2 channel is a main subtype of T-type calcium channels.T-type calcium channel blockers,such as pimozide and mibefradil,have been shown to prevent cerebral ischemia/reperfusion injury-induced brain injury.However,the role of Cav3.2 channels in cerebral ischemia/reperfusion injury remains unclear.Here,in vitro and in vivo models of cerebral ischemia/reperfusion injury were established using middle cerebral artery occlusion in mice and high glucose hypoxia/reoxygenation exposure in primary hippocampal neurons.The results showed that Cav3.2 expression was significantly upregulated in injured hippocampal tissue and primary hippocampal neurons.We further established a Cav3.2 gene-knockout mouse model of cerebral ischemia/reperfusion injury.Cav3.2 knockout markedly reduced infarct volume and brain water content,and alleviated neurological dysfunction after cerebral ischemia/reperfusion injury.Additionally,Cav3.2 knockout attenuated cerebral ischemia/reperfusion injury-induced oxidative stress,inflammatory response,and neuronal apoptosis.In the hippocampus of Cav3.2-knockout mice,calcineurin overexpression offset the beneficial effect of Cav3.2 knockout after cerebral ischemia/reperfusion injury.These findings suggest that the neuroprotective function of Cav3.2 knockout is mediated by calcineurin/nuclear factor of activated T cells 3 signaling.Findings from this study suggest that Cav3.2 could be a promising target for treatment of cerebral ischemia/reperfusion injury.
基金This study was supported by National Natural Science Foundation of China(No.81360359)2021 Innovation and Entrepreneurship Training Program for University Students,Hainan Medical University(No.202111810003)。
文摘Objective:To investigate the mechanism of long non-coding RNA-LINC00662 on induction of sorafenib resistance in hepatocellular carcinoma(HCC)cells.Methods:HCC cells(HepG2,HCCLM3),sorafenib-resistant hepatocellular carcinoma cells HCC-SR(HepG2-SR,HCCLM3-SR)were investigated by real-time fluorescence quantitative polymerase chain reaction(RT-qPCR)and Western blot was used to detect LINC00662,miR-106a-5p and cavitin-1(CAV1)expression in each group of cells.106a-5p and cavitin-1(CAV1)expression levels were measured by RT-qPCR and Western blot.The si-LINC00662 and miR-106a-5p mimics were transfected with HCC-SR cells,respectively,and cell sensitivity to sorafenib drug was detected by cell activity kit(CCK-8).And the targeting relationship between LINC00662 and miR-106a-5p,miR-106a-5p and CAV1 was further determined by dual luciferase reporter assay,RT-qPCR,and Western blot.Results:The relative expression of LINC00662 and CAV1 was significantly increased and miR-106a-5p expression was significantly decreased in HCC-SR cells(P<0.01,P<0.001);interference with LINC00662 expression or overexpression of miR-106a-5p significantly increased the sensitivity of HCC-SR cells to sorafenib drug(P<0.05,P<0.01).And LINC00662 targeted to negatively regulate miR-106a-5p expression and miR-106a-5p targeted to negatively regulate CAV1 expression(P<0.05).Conclusion:LINC00662 could act as a competitive endogenous RNA(ceRNA)of miR-106a-5p to promote the expression of CAV1 and mediate the resistance of sorafenib in HCC cells.Interfering with LINC00662 expression can inhibit sorafenib resistance and increase sorafenib drug sensitivity in HCC cells.
