丹皮酚对过氧化氢诱导的PC12细胞凋亡的抑制作用(英文)

目的探讨丹皮酚对过氧化氢(H2O2)诱导的PC12细胞凋亡的抑制作用及其机制。方法建立H2O2致PC12细胞损伤模型,采用MTT法测定细胞存活率,流式细胞术测定细胞凋亡率及细胞内活性氧含量,化学比色法测定乳酸脱氢酶(LDH)释放量及细胞内丙二醛(MDA)含量。结果PC12细胞经H2O2100μmol.L-1处理10 h可致细胞存活率下降,并能诱导细胞凋亡,LDH释放量及细胞内活性氧和MDA含量明显增加;丹皮酚(12,25和50μmol.L-1)预处理1 h可提高细胞存活率,减少细胞凋亡、LDH释放量及细胞内活性氧和MDA含量。结论丹皮酚对H2O2诱导的PC12细胞凋亡具有抑制作用,该作用可能与其抗氧化作用有关。     

Regulation of lysophosphatidic acid-induced COX-2 expression by ERK1/2 activation in cultured feline esophageal epithelial Cells

Lysophosphatidic acid (LPA), a potent bioactive phospholipid, mediates diverse cellular responses by binding to specific G protein-coupled receptors (GPCRs). We investigated the signaling mechanisms underlying LPA-induced COX-2 expression in primary cultures of feline esophageal epithelial cells. The identity of the cultures was confirmed by immunocytochemistry using a cytokeratin antibody. Western blot analysis revealed a concentration-and time-dependent induction of COX-2 in response to LPA. Of the three major MAPKs, only ERK1/2 was activated by LPA in a time-dependent manner. LPA-induced COX-2 expression was significantly attenuated by the MEK inhibitor, PD98059, but not by the JNK inhibitor, SP600125, or the p38 MAPK inhibitor, SB212090. LPA-induced COX-2 expression was repressed by pertussis toxin, GF109204X, and Ki16425, indicating the involvements of PTX-sensitive G_i/o protein, PKC, and the LPA_1/3 receptor, respectively. Our data suggest that in esophageal epithelial cells, LPA-induced COX-2 expression requires activation of PKC and ERK1/2 downstream of the LPA_1/3 receptor, Understanding the regulation of COX-2 expression induced by LPA in esophageal epithelial cells might provide a new therapeutic strategy for esophageal inflammatory diseases.     

总丹酚酸对过氧化氢诱导内皮细胞损伤的抑制作用(英文)

目的　研究总丹酚酸对过氧化氢 (H2 O2 )诱导血管内皮细胞损伤的影响。方法　培养的人脐静脉内皮细胞 ,用MTT法测定内皮细胞的存活率。用碘化丙啶 (PI)染色和TUNEL法测定H2 O2 诱导内皮细胞的凋亡作用。用荧光法测定半胱天冬酶 (cas pase) 3的活性。用Fura 2 /AM测定内皮细胞内游离钙离子浓度 ([Ca2 + ] i)。结果　 1 0 0 μmol·L-1 H2 O2可使内皮细胞的存活率下降 40 .2 % ,提前 1h给予总丹酚酸 1 0和 1 0 0mg·L-1 使存活率分别增加8.4%和2 8.6 %。 1 0 0 μmol·L-1 H2 O2 还可引起内皮细胞的凋亡 ,PI染色的结果显示 ,H2 O2 处理内皮细胞 1 8h后 ,凋亡率从 (7.1 %± 0 .7) %升至 (38.1±4.0 ) %。总丹酚酸 1 0 0mg·L-1 提前处理内皮细胞1h,可使内皮细胞凋亡率降至 (1 3 .6± 0 .8) %。TUNEL方法检测结果显示 ,H2 O2 处理内皮细胞后 ,TUNEL染色阳性的细胞从 (3 .0± 0 .8) %升至 (30 .5±2 .9) % ,总丹酚酸 1 0 0mg·L-1 可使TUNEL阳性细胞率降至 (1 9.0± 3 .7) %。此外 ,H2 O2 处理细胞后 ,内皮细胞半胱天冬酶 3的活性增加 1 76% ,[Ca2 + ] i 升高 1 0 1 % ,而总丹酚酸可以抑制H2 O2 引起的半胱天冬酶 3活性的增加和 [Ca2 + ] i 升高。结论　总丹酚酸对H2 O2 引起的内皮细胞损伤具有明显的抑制作     

左卡尼汀对过氧化氢诱导的心肌细胞凋亡的抑制作用(英文)

目的探讨左旋尼汀对心肌细胞凋亡的抑制作用及其可能的作用机制。方法采用培养的新生乳大鼠心肌细胞制备H2O2200μmol.L-1氧化损伤模型。实验分为正常对照组、H2O2200μmol.L-1模型组、左卡尼汀(0.3,0.6及1.2 mmol.L-1)组、左卡尼汀1.2 mmol.L-1+H2O2200μmol.L-1组。左卡尼汀0.3,0.6和1.2 mmol.L-1作用1 h后加入H2O2200μmol.L-1培养12 h,MTT法测定心肌细胞存活率,流式细胞仪测定心肌细胞的凋亡率,Western印迹法测定胱天蛋白酶3表达;用试剂盒方法检测过氧化物歧化酶(SOD)活性和丙二醛(MDA)水平。左卡尼汀1.2 mmol.L-1作用5 min后加入H2O2200μmol.L-1,采用Till阳离子测定系统监测5 min的心肌细胞[Ca2+]i瞬间变化。结果 H2O2200μmol.L-1作用于心肌细胞12 h能引起心肌细胞凋亡。左卡尼汀0.3,0.6和1.2 mmol.L-1能够不同程度的逆转由H2O2所致的损伤,使SOD活性明显增加,MDA水平明显降低(P<0.01)。左卡尼汀1.2 mmol.L-1作用最强,能够明显降低心肌细胞胱天蛋白酶3表达(P<0.01),明显降低H2O2引起的[Ca2+]i瞬间变化升高(P<0.01),但对于H2O2引起无钙血清培养的心肌细胞静息钙升高无影响。结论左卡尼汀能够抑制由H2O2引起的心肌细胞凋亡,该抑制作用可能与其保护细胞膜和减轻钙通道的损害、纠正[Ca2+]i瞬变失调及其抗氧化作用有关。     

Effects of hydrogen peroxide on mucociliary transport in human airway epithelial cells

The effects of environmental pollutants on airway clearance have not been well elucidated. This study examined mucociliary transport using different sized-fluorescent particles on polarized human airway epithelial cells which were maintained in an air–liquid interface (ALI) culture system. The effects of hydrogen peroxide (H₂O₂) exposure on mucociliary transport were also investigated. The movement of fluorescent particles with diameters of 10–14 and 2.5–4.5?µm was observed by fluorescent microscopy as an index of the mucociliary transport. The mixture of the particles with two different sizes was propelled concentrically on the apical surface by the interaction of ciliary activity and mucus in the control condition, whereas H₂O₂ exposure for 24?h significantly inhibited the movement of the particles. The particle sizes did not affect their movement after the control or H₂O₂ exposure. These results suggest that particle tracking on polarized human airway epithelial cells is a useful experimental tool for the evaluation of the effect of environmental pollutants on mucociliary transport. In addition, reactive oxygen species may impair mucociliary transport, leading to the airway damage and exacerbation of respiratory diseases.     

Inhibitory effect of grapefruit juice on the genotoxicity induced by hydrogen peroxide in human lymphocytes

By means of the comet assay we demonstrated a strong effect by hydrogen peroxide (HP) and no damage by grapefruit juice (GJ) in human lymphocytes. Cells exposed to HP and treated with three concentrations of GJ (10-90 min) showed an increase of DNA damage by HP over the control level, and a decrease of such damage by GJ. With the comet assay plus formamidopyrimidine-DNA-glycosylase we found the strongest increase of DNA damage by HP over the control level, and the strongest reduction of such damage by GJ. By applying the comet/FISH method we determined 98% of the p53 gene signals in the comet head of control cells along the experiment (10-90 min), in contrast with about 90% signals in the comet tail of cells exposed to HP. Cells treated with both agents showed a significant, concentration/time dependent return of p53 signals to the head, suggesting enhancement of the gene repair. Finally, with the annexin V assay we found an increase in apoptosis and necrosis by HP, and no effect by GJ; when GJ was added to HP treated cells no modification was observed in regard to apoptosis, although a decrease of necrosis was observed.     

过氧化氢对大鼠气管上皮细胞氧化性损伤研究

应用无血清培养方法，建立大鼠气管上皮细胞体外试验模型，研究过氧化氢对大鼠气管上皮细胞的氧化性损伤作用。试验结果表明，大鼠气管上皮细胞与５ｍｍｏｌ过氧化氢共同培养４小时，可引起细胞膜脂质过氧化，导致细胞膜通透性增加，从而对细胞产生损伤作用。无血清培养可排除血清中一些抗氧化物对试验结果的影响。     

Exposure of cells to hydrogen peroxide can increase the intracellular accumulation of drugs

One of the fastest growing areas of scientific research involves aspects of oxidative stress, either causes of or results from. Despite the enormous quantity of literature on the topic, surprisingly, the effects of oxidative stress on the pharmacokinetics of drugs have not been previously investigated. This is an extremely important concern, considering that the degree of oxidative stress that the human body experiences is known to be widely variable. Oxidative stress may be transiently increased, as is the case with some inflammatory episodes, or it may be chronically elevated, as is the case in some disease states, in aging, or with smokers. This report examines the influence of oxidative stress on the pharmacokinetics of model drugs utilizing cells in culture. Specifically, the effect of subtoxic, short-term exposure to hydrogen peroxide was investigated. Low micromolar, single doses of hydrogen peroxide were shown to cause dramatic increases in the apparent intracellular accumulation of model compounds with different physicochemical properties in different cell types. To examine the mechanistic basis for this, we evaluated possible hydrogen peroxide induced changes in cells including (1) intracellular pH, (2) membrane integrity, and (3) membrane fluidity (i.e., lateral membrane diffusion). We found no significant changes in pH or membrane integrity, but results were consistent with changes in hydrogen peroxide mediated reductions in lateral membrane diffusion, which we postulate facilitated the accumulation of the test substrates. Although studies presented here were all done in cell culture systems, we believe the findings could have substantial therapeutic relevance and warrant further investigations, which may provide reasons why drugs often have anomalous pharmacokinetic behavior and disproportionate dose-response relationships in certain patient populations.     

吡格列酮对过氧化氢诱导的乳鼠心肌细胞凋亡的抑制作用

目的观察吡格列酮对乳鼠心肌细胞凋亡的抑制作用及其可能作用机制。方法采用培养的新生大鼠乳鼠心肌细胞制备H2O2200μmol·L-1氧化损伤模型。实验分为正常对照组、模型组、吡格列酮组(0.1,1及10μmol·L-1)、吡格列酮(10μmol.L-1)+GW9662(10μmol·L-1)组、维拉帕米1μmol.L-1组。MTT法测心肌细胞的活力;采用硫代巴比妥酸比色法、黄嘌呤氧化酶法分别测定心肌细胞中脂质过氧化产物丙二醛(MDA)含量及超氧化物歧化酶(SOD)活性;流式细胞仪检测心肌细胞的凋亡率;采用Till阳离子测定系统,以Fura-2/AM为荧光探针,观察心肌细胞[Ca2+]i瞬间变化。结果H2O2200μmo.lL-1作用于心肌细胞12h能引起心肌细胞凋亡。吡格列酮浓度依赖性地增加受损心肌细胞的活力及SOD活性,降低MDA含量。吡格列酮10μmol·L-1抑制作用最明显,其与维拉帕米1μmol·L-1有相似的抑制作用,二者都可以减少心肌细胞的凋亡率,降低由H2O2诱导的升高的[Ca2+]i静息水平及频率。过氧化物酶体增殖物激活受体PPARγ受体特异性拮抗剂GW966210μmol.L-1能拮抗吡格列酮的部分抑制作用,但不影响吡格列酮对[Ca2+]i的瞬变作用。结论吡格列酮可以抑制H2O2诱导的乳鼠心肌细胞凋亡,其作用机制可能与其抗脂质氧化和减少细胞内钙超载有关,其抑制作用部分是通过PPARγ受体介导的。     

过氧化氢对原代培养大鼠肝细胞的毒性作用及其机理

本文报道了过氧化氢诱发原代培养大鼠肝细胞毒性作用的可能机理．过氧化氢（０．２～１．０ｍｍｏｌ·Ｌ－１）温育６ｈ可以引起大鼠肝细胞坏死性损伤，导致谷丙转氨酶释放增加及细胞存活率下降，加入过氧化氢酶（２５０～１５００Ｕ·ｍＬ－１）及抗氧化剂五味子乙素（１０～１００μｍｏｌ·Ｌ－１）均可降低过氧化氢的毒性作用．加入过氧化氢（０．６和１．０ｍｍｏｌ·Ｌ－１）可在６ｍｉｎ内使大鼠肝细胞内钙从１８０ｎｍｏｌ·Ｌ－１明显持续升高至７００ｎｍｏｌ·Ｌ－１以上（约３．５倍）．过氧化氢与肝细胞作用３０ｍｉｎ至１ｈ既可导致细胞膜脂质过氧化，表现为丙二醛蓄积及膜流动性下降，明显早于肝细胞发生坏死性损伤的时间．肝细胞胞浆中还原型谷胱甘肽（ＧＳＨ）含量在加入过氧化氢３０ｍｉｎ后明显降低，可推测肝细胞在后面的温育中对过氧化氢毒性的敏感性增加．以上结果证实过氧化氢诱发的原代培养大鼠肝细胞致死性损伤可能与细胞内钙迅速持续增高，细胞膜脂质过氧化及ＧＳＨ含量下降有关．     

Cytoprotective effect of eupatilin against indomethacin-induced damage in feline esophageal epithelial cells: relevance of HSP27 and HSP70

Indomethacin is a non-steroidal anti-inflammatory drug with clearly known side effects on the gastrointestinal tract. The purpose of the present study was to investigate whether eupatilin inhibit cell injury induced by indomethacin in cultured feline esophageal epithelial cells (EECs). EECs were used to investigate the ability of eupatilin to induce the expression of heat shock proteins (HSP27 and HSP70) and analyze its cytoprotective effect against indomethacin-induced damage. The treatment of EECs with indomethacin for 8 h decreased cell viability. Western blot analysis showed that the levels of HSPs gradually decreased in cells treated with indomethacin, while eupatilin treatment increased the levels of HSPs. When treated with both indomethacin and eupatilin, the levels of HSPs increased rapidly, and were maintained at 130–140%. In addition, treatment with the specific inhibitors of PTK, PKC, PLC, p38 MAPK, JNKs, and PI3K attenuated the eupatilin-induced expression of HSPs. Pretreatment of EECs with the inhibitors of protein synthesis, actinomycin D or cycloheximide, attenuated the cytoprotective effect of eupatilin on indomethacin-induced cell damage. Reactive oxygen species production was upregulated by indomethacin, but downregulated by eupatilin. Taken together, it was suggested that HSPs were partly responsible for the eupatilin-mediated cytoprotective activity against the indomethacin-induced damage in EECs.     

促红细胞生成素对人视网膜色素上皮细胞氧化损伤的保护作用

目的探讨促红细胞生成素对过氧化氢氧化损伤人视网膜色素上皮细胞的保护作用及其机制。方法采用600μmol.L-1的过氧化氢造成体外培养的人视网膜色素上皮细胞氧化损伤模型。实验设计分为5组:对照组,过氧化氢模型组,过氧化氢+10 kIU.L-1EPO组,过氧化氢+20 kIU.L-1EPO组和过氧化氢+40 kIU.L-1EPO组。MTT法检测细胞活性,测定细胞内超氧化物歧化酶(SOD)和丙二醛(MDA)含量,Annexin V-FITC/PI双染色流式细胞法测定细胞的凋亡率。结果过氧化氢模型组RPE细胞的活性明显降低,不同浓度的EPO药物干预组的细胞活性较模型组明显升高,并随着EPO浓度的升高而升高。过氧化氢模型组RPE细胞SOD活性降低,MDA的含量增加;而EPO药物干预组SOD活性较模型组明显升高,MDA含量减少,差异有显著性。过氧化氢模型组RPE细胞的凋亡率升高,而不同浓度的EPO药物干预组降低RPE的凋亡率,凋亡率随着EPO浓度的升高而降低。结论促红细胞生成素对过氧化氢诱导的人RPE细胞的氧化损伤有保护作用,其机制可能与抑制氧化反应、提高抗氧化酶活性、减少细胞凋亡有关。     

Protective effect of lipoic acid against hydrogen peroxide in yeast cells

Lipoic acid (LA) is found in all kinds of cells, it is widely used in medicine and as a dietary supplement, and it is involved in different physiological functions. Even if there are many papers regarding therapeutic effects of LA, medical research does not always support its effectiveness and little is known about LA metabolism in eukaryotic cells. In this work the probable protective effect of LA was investigated employing five strains of yeast Saccharomyces cerevisiae through short term assays. In particular LA behaviour in oxidative stress conditions was studied. For this purpose hydrogen peroxide was used as oxidant. In D7 strain, LA showed antimutagenic effects against hydrogen peroxide and decreased significantly cytochrome P450. To better elucidate the effect of LA the following yeast strains carrying deletions in superoxide dismutase genes (SOD) were employed: EG-103 (wild type), EG-110 strain (without mytochondrial SOD), EG-118 (without cytoplasmatic SOD) and EG-133 (without both enzymes). LA increased the number of mitotic divisions in EG-103, EG-110 and EG-133 and in growing cells (EG-103, EG-110, EG-118) it increased survival percentage with respect to hydrogen peroxide. The positive action was evident in D7 and in EG strains and it showed that LA can be protective and antimutagenic against oxidants in yeast cells, via its antioxidant activity.     

Protective effect of erythropoietin against aristolochic acid-induced apoptosis in renal tubular epithelial cells

The goal of this research was to investigate the renoprotective effect of erythropoietin against aristolochic acid-induced apoptosis in cultured LLC-PK1 cells as well as underlying mechanism. LLC-PK1 cells impaired by aristolochic acid were used in this study as the cell model of aristolochic acid nephropathy. Apoptosis was studied by different methods (transmission electron microscopy, fluorescence-activated cell sorting, TUNEL, caspase-3 activation). Cells showed apoptotic morphology when exposed to 10 mug/ml aristolochic acid for 24 h, and the apoptotic index was increased (37.67%) compared with the control (6.09%). The presence of recombinant human erythropoietin (10, 20 U/ml, 24 h) significantly lowered the apoptotic index (22.41%, 14.63%) and the damage of cytoskeleton was also ameliorated. Studies on the apoptotic signaling showed that recombinant human erythropoietin inhibited the activation of caspase-3 and upregulated the expression of anti-apoptotic gene, Bcl-XL. Moreover, recombinant human erythropoietin (10, 20 U/ml, 24 h) promoted the expression of proliferating cell nuclear antigen in renal tubular cells stimulated by 10 mug/ml aristolochic acid (46.34%, 48.11% vs. 28.46%). Together, our data provide in vitro evidence that recombinant human erythropoietin mediated renoprotective effect against aristolochic acid injury in renal tubular cells by ameliorating the damage of cytoskeleton, reducing the number of apoptotic cells and promoting cell regeneration. So a possibility is suggested that recombinant human erythropoietin may be beneficial in preventing aristolochic acid-induced apoptosis and could be a new promising therapeutic strategy for aristolochic acid-induced kidney damage.     

羟乙基葛根素对过氧化氢致牛脑微血管内皮细胞损伤的保护作用

目的研究牛脑微血管内皮细胞(BCMEC)过氧化损伤机制并探讨羟乙基葛根素对牛脑微血管内皮细胞损伤的保护作用。方法用MTT法和LDH活性检测测定BCMEC的损伤；倒置相差显微镜下一般形态学观察、透射电子显微镜超微结构观察及流式细胞术测定BCMEC凋亡变化。结果H₂O₂ (200 μmol·L^-1)损伤BCMEC后，细胞存活率下降，LDH释放增加，羟乙基葛根素和edaravone可减轻此损伤。H₂O₂ (100 μmol·L^-1)可诱导BCMEC凋亡，羟乙基葛根素 和edaravone对此有保护作用。结论羟乙基葛根素和edaravone对H₂O₂导致的BCMEC坏死和凋亡有保护作用，该作用与其抗氧化作用有关。     

Effect of gold nanoparticles on glutathione depletion-induced hydrogen peroxide generation and apoptosis in HL7702 cells

Gold nanoparticles (AuNPs) have shown promising biological and military applications due to their unique electronic and optical properties. However, little is known about their cytotoxicity when they come into contact with a biological system. The primary objective of this study is to determine the sequence of apoptotic signaling events that occur after modulation of the cellular redox state in HL7702 cells (human liver cell line), with emphasis on the role of the interaction of AuNPs with glutathione (GSH). After incubation with 8 nm AuNPs at 50 nM, there was an early decline in cytosolic GSH, which initiated mitochondrial transmembrane potential (ΔΨm) depolarization and apoptosis. Mitochondrial GSH depletion was observed at approximately 48 h, after which mitochondrial hydrogen peroxide (H₂O₂) production increased significantly and apoptosis was further exacerbated. Bax translocation, cytochrome c release and downstream caspase 3 were first detected at 24 h, notably after 48 h, corresponding with increasing H₂O₂ level. These data suggest that HL7702 cells are depleted of intracellular GSH as a result that 8 nm AuNPs possess strong Au-S bonding interactions with GSH. A decrease in GSH alone can act as a potent early activator of apoptotic signaling. Increased H₂O₂ production following mitochondrial GSH depletion represents a crucial event, which commits HL7702 cells to apoptosis through mitochondrial pathway.     

Inhibitory effect of FSLLRY-NH<Subscript>2</Subscript> on inflammatory responses induced by hydrogen peroxide in HepG2 cells

Proteinase activated receptor 2 (PAR2), which is localized in the GI tract, the respiratory system, and the kidney tubules is a G protein-coupled receptor associated with inflammation, metabolism, and disease. The aim of this study was to explore the role of PAR2 in hydrogen peroxide (H₂O₂)-induced HepG2 cells by using FSLLRY-NH₂ a PAR2 antagonist. H₂O₂ treatment resulted in induction of PAR2 in esophageal, gastric, and liver cells, with the most robust response being in HepG2 cells. Furthermore, this effect was dose-dependent in HepG2 cells. Treatment with H₂O₂ at concentrations above 400 μM for 24 h also reduced HepG2 cell viability. H₂O₂ treatment increased both the protein and mRNA levels of IL-1β, IL-8, and TNF-α, as well as those of SAPK/JNK. The increased levels of these pro-inflammatory genes and SAPK/JNK induced by H₂O₂ were attenuated in a dose-dependent manner when cells were co-treated with H₂O₂ and FSLLRY-NH2. In summary, the PAR2 antagonist peptide, FSLLRY-NH2, reduces the level of the pro-inflammatory genes IL-8, IL-1β, and TNF-α induced by H₂O₂, through the SAPK/JNK pathways in HepG2 cells. These data suggest that a PAR2 antagonist could be an anti-inflammatory agent in HepG2 cells.     

Chloride channel blockers decrease intracellular pH in cultured renal epithelial LLC-PK1 cells.

The effects of chloride channel blockers upon intracellular pH (pHi) were examined in renal epithelial monolayers of LLC-PK1 cells. A significant intracellular acidification was found with addition of 100 microM 5-nitro-2-(3-phenylpropylamino)-benzoate (NPPB), niflumic acid, flufenamate and diphenylamine-2-carboxylate (DPC) but not with 4,4'-diisothiocyanatostilbene-2-2'disulphonic acid (DIDS). The effects of these agents upon pHi was dose-dependent with apparent K0.5 values of: 16.7 +/- 0.3 microM, 34.2 +/- 0.9 microM and 740 +/- 13 microM for niflumic acid, flufenamate and DPC respectively. The results indicate that at concentrations commonly used to block channel activity these chloride channel blockers have profound effects upon pHi.     

鱼藤素对食管癌EC-109细胞增殖的抑制作用及部分机制

<正>氧化和抗氧化失衡在肿瘤发生发展过程中的作用被越来越多的学者所关注~([1-2])。本实验拟通过安全有效的体外实验来观察鱼藤素在食管癌细胞中的作用效果,同时观察慢性氧化应激相关通路在其中的作用机制。1材料与方法1.1药物与试剂鱼藤素(deguelin)购自Sigma公司,p-Akt兔抗人单克隆抗体、Nrf2兔抗人单克隆抗体、HO-1鼠抗人单克隆抗体均购自美国Santa Cruz公司。     

靶向Ccndl基因的siRNA对大鼠晶状体上皮细胞增殖的抑制作用

目的 探讨靶向Cendl基因小干扰RNA(siRNA)对培养的大鼠晶状体上皮细胞(LECs)Ccndl mRNA和周期蛋白D1表达及细胞增殖的抑制作用.方法 合成3条靶向大鼠Ccndl基因的siRNA(si-Ccndl-1,si-Ccndl-2,si-Ccndl一3),LipofectamineTM2000转染体外培养的大鼠LECs,应用RT-PCR和Western blot方法分别检测Ccndl mRNA和周期蛋白D1表达变化,筛选最有效siRNA序列.MTT法连续测定转染最有效siRNA序列后24、48、72、96和120 h细胞增殖情况.结果 与对照组相比,3条siRNA均能不同程度地抑制Ccndl mRNA和周期蛋白D1的表达,以si-Ccndl-3最为有效(P<0.05).与对照组比较,si-Ccndl-3转染后24 h开始明显发挥对细胞增殖的抑制作用,并持续至120 h以后(P<0.05).结论 靶向Ccndl的siRNA能有效降低大鼠LECsCcndl mRNA和周期蛋白D1蛋白表达,抑制LECs增殖.