目的 基于Kelch樣ECH相關(guān)蛋白1(Kelch-like ECH-associated protein 1,Keap1)/核因子E2相關(guān)因子2(nuclear factor erythroid 2-related factor 2,Nrf2)/抗氧化反應(yīng)元件(antioxidant response elements,ARE)通路和銅穩(wěn)態(tài)研究珠子參總皂苷(total saponins of Panax japonicus,TSPJ)對(duì)伊利司莫和二水合氯化銅(elesclomol-CuCl₂·2H₂O,Ele-Cu²⁺)誘導(dǎo)的肝細(xì)胞銅死亡的影響。方法 設(shè)置對(duì)照組、模型組、TSPJ(25 μg/mL)組、Nrf2抑制劑ML385(10 μmol/L)組和TSPJ(25 μg/mL)＋ML385(10 μmol/L)組。構(gòu)建Ele-Cu²⁺誘導(dǎo)的AML-12細(xì)胞銅死亡模型,給予藥物干預(yù)后,采用MTT法檢測(cè)細(xì)胞活力;采用試劑盒檢測(cè)乳酸脫氫酶(lactate dehydrogenase,LDH)釋放率及細(xì)胞中過(guò)氧化氫酶(catalase,CAT)、谷胱甘肽(glutathione,GSH)、丙二醛(malondialdehyde,MDA)、髓過(guò)氧化物酶(myeloperoxidase,MPO)、超氧化物歧化酶(superoxide dismutase,SOD)、總抗氧化能力(total antioxidant capacity,T-AOC)水平;采用Sytox Green、DCFH-DA、JC-1、R6G熒光探針?lè)謩e檢測(cè)細(xì)胞壞死性凋亡、活性氧(reactive oxygen species,ROS)水平、線(xiàn)粒體膜電位(mitochondrial membrane potential,MMP)和Cu²⁺水平;采用qRT-PCR和Western blotting檢測(cè)細(xì)胞中Keap1、Nrf2、谷氨酸半胱氨酸連接酶催化亞基(glutamate-cysteine ligase catalytic subunit,GCLC)、血紅素加氧酶-1(heme oxygenase-1,HO-1)、NAD(P)H醌氧化還原酶1[NAD(P)H quinone oxidoreductase 1,NQO1]、二氫硫辛酸乙酰轉(zhuǎn)移酶(dihydrolipoamide acetyltransferase,DLAT)、鐵氧還蛋白1(ferredoxin 1,FDX1)、硫辛酸合酶(lipoic acid synthase,LIAS)、熱休克蛋白70(heat shock protein 70,HSP70)、三磷酸腺苷(adenosine triphosphate,ATP)酶銅轉(zhuǎn)運(yùn)蛋白7A(ATPase copper-transporting 7α,ATP7A)、ATP酶銅轉(zhuǎn)運(yùn)蛋白7B(ATPase copper-transporting 7β,ATP7B)、銅離子通道溶質(zhì)載體家族31成員1(copper ion channels solute carrier family 31 member 1,SLC31A1)、抗氧化劑1銅伴侶蛋白(antioxidant 1,ATOX1)、超氧化物歧化酶的銅伴侶蛋白(copper chaperone for Sod1,CCS)、細(xì)胞色素C氧化酶銅伴侶蛋白17(cytochrome C oxidase 17,COX17)mRNA和蛋白表達(dá)。結(jié)果 與模型組比較,TSPJ組細(xì)胞存活率和MMP水平顯著升高(P＜0.05、0.01),細(xì)胞壞死性凋亡率、LDH釋放率、ROS、Cu²⁺、MDA水平和MPO活性顯著降低(P＜0.05、0.01),CAT、GSH、SOD、T-AOC活性顯著升高(P＜0.01),Nrf2、GCLC、HO-1、NQO1、FDX1、LIAS、DLAT、ATP7A、ATP7B、CCS、COX17 mRNA和蛋白表達(dá)水平顯著升高(P＜0.01),Keap1、HSP90、SLC31A1、ATOX1 mRNA和蛋白表達(dá)水平顯著降低(P＜0.01);而ML385能夠顯著抑制TSPJ對(duì)細(xì)胞銅死亡的改善作用(P＜0.01)。結(jié)論 TSPJ可能通過(guò)激活Keap1/Nrf2/ARE信號(hào)通路,調(diào)節(jié)銅穩(wěn)態(tài)改善Ele-Cu²⁺誘導(dǎo)的肝細(xì)胞銅死亡。

Objective To investigate the effect of total saponins of Panax japonicus (TSPJ) on cuproptosis induced by elesclomol-CuCl₂·2H₂O (Ele-Cu²⁺) in hepatocytes based on Kelch-like ECH-associated protein 1 (Keap1)/nuclear factor erythroid 2-related factor 2 (Nrf2)/antioxidant response elements (ARE) pathway and copper homeostasis. Methods Control group, model group, TSPJ (25 μg/mL) group, Nrf2 inhibitor ML385 (10 μmol/L) group and TSPJ (25 μg/mL) + ML385 (10 μmol/L) group were set up. Ele-Cu²⁺-induced cuproptosis model in AML-12 cells was established. After drug intervention, cell viability was detected by MTT; The release rate of lactate dehydrogenase (LDH), as well as levels of catalase (CAT), glutathione (GSH), malondialdehyde (MDA), myeloperoxidase (MPO), superoxide dismutase (SOD) and total antioxidant capacity (T-AOC) in cells were detected by reagent kits; The levels of necrotic apoptosis, reactive oxygen species (ROS), mitochondrial membrane potential (MMP) and Cu²⁺ were respectively detected by Sytox Green, DCFH-DA, JC-1 and R6G fluorescent probes; The mRNA and protein expressions of Keap1, Nrf2, glutamate-cysteine ligase catalytic subunit (GCLC), heme oxygenase-1 (HO-1), NAD(P)H quinone oxidoreductase 1 (NQO1), dihydrolipoamide acetyltransferase (DLAT), ferredoxin 1 (FDX1), lipoic acid synthase (LIAS), heat shock protein 70 (HSP70), ATPase copper-transporting 7α (ATP7A), ATPase copper-transporting 7β (ATP7B), copper ion channels solute carrier family 31 member 1 (SLC31A1), antioxidant 1 (ATOX1), copper chaperone for Sod1 (CCS) and cytochrome C oxidase 17 (COX17) were detected by qRT-PCR and Western blotting. Results Compared with model group, survival rate and MMP level in TSPJ group were significantly increased (P < 0.05, 0.01), the necrotic apoptosis rate, LDH release rate, levels of ROS, Cu²⁺, MDA and activity of MPO were significantly reduced (P < 0.05, 0.01), the levels of CAT, GSH, SOD and T-AOC were significantly increased (P < 0.01), the mRNA and protein expressions of Nrf2, GCLC, HO-1, NQO1, FDX1, LIAS, DLAT, ATP7A, ATP7B, CCS, COX17 were significantly up-regulated (P < 0.01), the mRNA and protein expressions of Keap1, HSP70, SLC31A1, ATOX1 were significantly down-regulated (P < 0.01). While ML385 could significantly inhibit the amelioration effect of TSPJ on cell cuproptosis (P < 0.01). Conclusion TSPJ may ameliorate Ele-Cu²⁺-induced cuproptosis in hepatocytes by activating Keap1/Nrf2/ARE pathway and regulating copper homeostasis.

R285.5

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