Panax notoginseng Saponins Protect Brain Microvascular Endothelial Cells against Oxygen-Glucose Deprivation/Resupply-Induced Necroptosis via Suppression of RIP1-RIP3-MLKL Signaling Pathway

Recently, necroptosis has emerged as one of the important mechanisms of ischemia stroke. Necroptosis can be rapidly activated in endothelial cells to cause vascular damage and neuroinflammation. Panax notoginseng saponins (PNS), an ingredient extracted from the root of Panax notoginseng (Burk.) F.H....

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Veröffentlicht in:Neurochemical research 2022-11, Vol.47 (11), p.3261-3271
Hauptverfasser: Hu, Yanhong, Lei, Hongtao, Zhang, Sai, Ma, Jiabao, Kang, Soyeon, Wan, Liangqin, Li, Fanghe, Zhang, Fan, Sun, Tianshi, Zhang, Chujun, Li, Weihong
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container_end_page 3271
container_issue 11
container_start_page 3261
container_title Neurochemical research
container_volume 47
creator Hu, Yanhong
Lei, Hongtao
Zhang, Sai
Ma, Jiabao
Kang, Soyeon
Wan, Liangqin
Li, Fanghe
Zhang, Fan
Sun, Tianshi
Zhang, Chujun
Li, Weihong
description Recently, necroptosis has emerged as one of the important mechanisms of ischemia stroke. Necroptosis can be rapidly activated in endothelial cells to cause vascular damage and neuroinflammation. Panax notoginseng saponins (PNS), an ingredient extracted from the root of Panax notoginseng (Burk.) F.H. Chen, was commonly used for ischemic stroke, while its molecular mechanism and targets have not been fully clarified. Our study aimed to clarify the anti-necroptosis effect of PNS by regulating RIP1-RIP3-MLKL signaling pathway in brain microvascular endothelial cells (BMECs) subjected to transient oxygen-glucose deprivation (OGD/resupply [R]). In vitro, the necroptosis model of rat BMECs was established by testing the effect of OGD/R in the presence of the pan-caspase inhibitor z-VAD-FMK. After administration of PNS and Nec-1, cell viability, cell death modality, the expression of RIP1-RIP3-MLKL pathway and mitochondrial membrane potential (Δψm) level were investigated in BMECs upon OGD/R injury. The results showed that PNS significantly enhanced cell viability of BMECs determined by CCK-8 analysis, and protected BMECs from necroptosis by Flow cytometry and TEM. In addition, PNS inhibited the phosphorylation of RIP1, RIP3, MLKL and the downstream expression of PGAM5 and Drp1, while similar results were observed in Nec-1 intervention. We further investigated whether PNS prevented the Δψm depolarization. Our current findings showed that PNS effectively reduced the occurrence of necroptosis in BMECs exposed to OGD/R by inhibition of the RIP1-RIP3-MLK signaling pathway and mitigation of mitochondrial damage. This study provided a novel insight of PNS application in clinics.
doi_str_mv 10.1007/s11064-022-03675-0
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Necroptosis can be rapidly activated in endothelial cells to cause vascular damage and neuroinflammation. Panax notoginseng saponins (PNS), an ingredient extracted from the root of Panax notoginseng (Burk.) F.H. Chen, was commonly used for ischemic stroke, while its molecular mechanism and targets have not been fully clarified. Our study aimed to clarify the anti-necroptosis effect of PNS by regulating RIP1-RIP3-MLKL signaling pathway in brain microvascular endothelial cells (BMECs) subjected to transient oxygen-glucose deprivation (OGD/resupply [R]). In vitro, the necroptosis model of rat BMECs was established by testing the effect of OGD/R in the presence of the pan-caspase inhibitor z-VAD-FMK. After administration of PNS and Nec-1, cell viability, cell death modality, the expression of RIP1-RIP3-MLKL pathway and mitochondrial membrane potential (Δψm) level were investigated in BMECs upon OGD/R injury. The results showed that PNS significantly enhanced cell viability of BMECs determined by CCK-8 analysis, and protected BMECs from necroptosis by Flow cytometry and TEM. In addition, PNS inhibited the phosphorylation of RIP1, RIP3, MLKL and the downstream expression of PGAM5 and Drp1, while similar results were observed in Nec-1 intervention. We further investigated whether PNS prevented the Δψm depolarization. Our current findings showed that PNS effectively reduced the occurrence of necroptosis in BMECs exposed to OGD/R by inhibition of the RIP1-RIP3-MLK signaling pathway and mitigation of mitochondrial damage. 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The results showed that PNS significantly enhanced cell viability of BMECs determined by CCK-8 analysis, and protected BMECs from necroptosis by Flow cytometry and TEM. In addition, PNS inhibited the phosphorylation of RIP1, RIP3, MLKL and the downstream expression of PGAM5 and Drp1, while similar results were observed in Nec-1 intervention. We further investigated whether PNS prevented the Δψm depolarization. Our current findings showed that PNS effectively reduced the occurrence of necroptosis in BMECs exposed to OGD/R by inhibition of the RIP1-RIP3-MLK signaling pathway and mitigation of mitochondrial damage. This study provided a novel insight of PNS application in clinics.</abstract><cop>New York</cop><pub>Springer US</pub><pmid>35904697</pmid><doi>10.1007/s11064-022-03675-0</doi><tpages>11</tpages></addata></record>
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subjects Animals
Biochemistry
Biomedical and Life Sciences
Biomedicine
Brain
Brain - metabolism
Caspase
Caspase inhibitors
Caspases - metabolism
Caspases - pharmacology
Cell Biology
Cell death
Cell viability
Cholecystokinin
Damage
Depolarization
Deprivation
Endothelial cells
Endothelial Cells - metabolism
Flow cytometry
Glucose
Glucose - metabolism
Inflammation
Ischemia
Kinases
Membrane potential
Microvasculature
Mitochondria
Necroptosis
Neurochemistry
Neurology
Neurosciences
Original Paper
Oxygen
Oxygen - metabolism
Panax notoginseng
Panax notoginseng - chemistry
Phosphorylation
Protein Kinases - metabolism
Rats
Receptor-Interacting Protein Serine-Threonine Kinases - metabolism
Saponins
Saponins - pharmacology
Signal Transduction
Signaling
Stroke
title Panax notoginseng Saponins Protect Brain Microvascular Endothelial Cells against Oxygen-Glucose Deprivation/Resupply-Induced Necroptosis via Suppression of RIP1-RIP3-MLKL Signaling Pathway
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