杜仲叶提取物对3T3-L1前脂肪细胞分化的影响

研究了杜仲叶提取物对3T3-L1前脂肪细胞向脂肪细胞分化的影响。     

黄连解毒汤对3T3-L1前脂肪细胞分化的抑制

以3T3-L1前脂肪细胞探讨了黄连解毒汤及其组成生药对脂肪细胞分化的影响。     

芦丁对3T3-L1前脂肪细胞分化的作用

目的探索芦丁对3T3-L1前脂肪细胞分化的影响。方法采用3T3-L1前脂肪细胞分化模型和油红O染色法,选用罗格列酮作为阳性对照药,观察芦丁对3T3-L1前脂肪细胞分化的作用,于510 nm波长下测定芦丁对脂含量的影响。利用流式细胞仪测定芦丁对分化的脂肪细胞吸收葡萄糖的影响。结果芦丁在0.5μmol/L和1μmol/L两个浓度下均能促进3T3-L1前脂肪细胞分化过程,提高脂含量,并促进了葡萄糖吸收。结论芦丁能够促进3T3-L1前脂肪细胞分化,并促进了分化的脂肪细胞吸收葡萄糖。     

含左归丸鼠血清对3T3-L1前脂肪细胞芳香化酶mRNA表达的影响

目的：观察含左归丸鼠血清对3T3-L1前脂肪细胞芳香化酶 mRNA 表达的影响。方法：将雌性育龄期大鼠分为正常组20只、假手术组17只、模型组8只、阳性对照组11只、左归丸高剂量组（左高组）6只、左归丸低剂量组（左低组）9只,连续灌胃11周,分离血清检测 E2;以2％各类鼠血清加入培养液培养分化中的3T3-L1前脂肪细胞,48 h 后测细胞上清液E2和细胞芳香化酶 mRNA 表达。结果：与模型组比较,左高组、左低组给药前后体重有升高趋势,但无明显统计学意义（P＞0.05）;左高组、左低组鼠血清 E2值较模型组无明显统计学意义（P ＞0.05）;培养3T3-L1前脂肪细胞48h 后,细胞上清液 E2值左高组（9.40±3.61）pg／mL、左低组（8.94±2.91）pg／mL 比模型组（3.99±0.76）pg／mL 略有升高;模型组（0.39）芳香化酶 mRNA 表达（P450arom／GAPDH）水平高于左高组（0.25）。结论：左归丸对去势雌鼠血清 E2和体重无明显影响,可增强3T3-L1前脂肪细胞的芳香化酶活性。     

雪菊不同提取部位对3T3-L1前脂肪细胞增殖与分化的影响

目的：以3T3-L1前脂肪细胞为载体,考察雪菊总提物、正丁醇部位、黄酮单体CB-1及CB-2对该细胞增殖与分化的影响。方法：雪菊4个不同提取部位分别设3个剂量组。MTT法检测雪菊4个不同提取部位对3T3-L1细胞增殖的作用,油红O染色并通过比色分析细胞分化过程中胞浆脂质的形成与积累。结果：与对照组相比,雪菊总提取物100 μg·mL-1,正丁醇部位0.5、5、50 μg·mL-1,黄酮单体CB-1、CB-2在50 μg·mL-1浓度时对细胞增殖有显著抑制作用（P<0.01）;正丁醇部位的作用呈一定的量效关系（相关系数r=-0.903）。油红O染色结果表明,与对照组相比,雪菊总提取物1、10、100 μg·mL-1均可以显著抑制细胞分化,减少细胞中脂质的形成（P<0.01）;正丁醇部位能够剂量依赖性地抑制细胞分化（r=-0.779）;CB-1与CB-2在50 μg·mL-1浓度时对细胞分化有显著抑制作用（P<0.01）。结论：雪菊总提物、正丁醇部位、CB-1与CB-2均能够抑制3T3-L1前脂肪细胞的增殖与分化,减少细胞中脂质积累。     

3T3-L1前脂肪细胞与肥胖的相关性研究进展

肥胖已经成为危害人类健康的重要疾病,研究减肥药物的体外作用靶点和机制变得越来越重要。3T3-L1前脂肪细胞是目前研究脂肪代谢紊乱疾病最广泛的一种细胞系,已经被培养成为成熟的细胞系。本文旨在对3T3-L1前脂肪细胞的培养、鉴定及其在肥胖中研究的应用进行综述,为肥胖的体外研究提供思考方法。     

3’-羟基葛根素对脂肪细胞3T3-L1胰岛素抵抗的影响及其机制研究

目的探讨3′-羟基葛根素改善胰岛素抵抗的作用及其机制。方法采用MTT法检测3′-羟基葛根素对3T3-L1前脂肪细胞增殖的影响;油红O染色法检测其对3T3-L1前脂肪细胞分化的影响。以地塞米松诱导分化成熟的脂肪细胞,建立胰岛素抵抗模型,分别采用葡萄糖氧化酶法和比色法检测细胞培养上清液中葡萄糖消耗量和游离脂肪酸(FFA)生成量;实时荧光定量PCR法分析脂肪细胞中过氧化物酶体增殖物激活受体γ(peroxysome proliferator-activated receptor gamma,PPARγ)和蛋白酪氨酸磷酸酶1B(protein tyrosine phosphatase 1B,PTP1B)的基因表达。采用嵌合蛋白基因试验检测3′-羟基葛根素的PPARγ配体结合活性和比色法检测其对PTP1B酶活性的影响。结果与溶媒对照组相比,1~10μmol/L 3′-羟基葛根素显著促进3T3-L1前脂肪细胞增殖及细胞分化(P<0.05、0.01)。与模型组相比,无论在基础状态还是胰岛素刺激状态,3′-羟基葛根素均能显著增加胰岛素抵抗脂肪细胞葡萄糖利用率、减少FFA的产生(P<0.05、0.01);同时显著上调胰岛素抵抗脂肪细胞PPARγ基因的表达,但对PTP1B基因表达无明显影响(P>0.05)。与溶媒对照组相比,3′-羟基葛根素在0.1、10.0μmol/L时能对PPARγ产生激活作用(P<0.05、0.01),但对PTP1B酶活性没有明显抑制作用(P>0.05)。结论 3′-羟基葛根素能促进胰岛素抵抗脂肪细胞葡萄糖利用、抑制FFA产生,从而改善胰岛素抵抗,其机制可能与上调PPARγ基因表达有关。     

降脂平肝汤含药血清对大鼠3T3-L1脂肪细胞胰岛素抵抗的影响

目的观察降脂平肝汤含药血清对大鼠3T3-L1脂肪细胞胰岛素受体底物1(IRS-1)mRNA和过氧化物酶增殖体激活受体(PPAR)-γmRNA表达的影响,探讨其对脂肪细胞胰岛素抵抗影响的可能机制。方法选择Wistar大鼠16只,诱导分化3T3-L1脂肪前体细胞为成熟的脂肪细胞并以肿瘤坏死因子α(TNFα)诱导建立脂肪细胞的胰岛素抵抗模型,取诱导成功的胰岛素抵抗模型细胞分为对照组(基础培养液加入20%大鼠空白血清)、模型组(基础培养液加入20%大鼠空白血清和20ng/mlTNF-α)、罗格列酮组(基础培养液加入20%大鼠含药血清和20ng/mlTNF-α)、降脂平肝汤组(基础培养液加入20%大鼠含药血清和20ng/mlTNF-α)每组4只,培养48h,观察细胞IRS-1mRNA和PPAR-γmRNA表达水平的变化。结果模型组IRS-1mRNA和PPAR-γmRNA表达明显降低,与对照组比较差异有统计学意义(P<0.05);罗格列酮组与降脂平肝汤组IRS-1mRNA和PPAR-γmRNA表达均明显增高,与模型组比较差异有统计学意义(P<0.05)。结论降脂平肝汤可能通过增强大鼠IRS-1、PPAR-γ基因的表达起到抑制脂肪细胞胰岛素抵抗的作用。     

小檗碱对3T3-L1前脂肪细胞及其胰岛素抵抗模型的影响

目的:探查小檗碱的体外安全浓度及其对脂肪细胞的抗胰岛素抵抗(IR)活性。方法:3T3-L1前脂肪细胞分为空白组和小檗碱不同浓度(0.001~10μmol·L-1)组,48 h后MTT法测定各组的A值。成熟的3T3-L1脂肪细胞分为空白组和IR模型组,模型组细胞经10μmol·L-1胰岛素(Ins)诱导24,48 h。检测各组培养液和细胞葡萄糖含量。检测IR模型细胞经小檗碱不同浓度(0.000 1~1μmol·L-1)干预24,48 h后的培养液中葡萄糖含量。结果:小檗碱0.01~1μmol·L-13个浓度和10μmol·L-1作用的前脂肪细胞A值均显著升高或降低(P0.05,P0.01);经Ins诱导24,48 h的培养液和细胞葡萄糖含量均显著增加或减少(P0.01);作用24 h的小檗碱0.01~1μmol·L-1和作用48 h的0.000 1~1μmol·L-1各浓度组培养液中的葡萄糖量均显著减少(P0.01)。结论:小檗碱的体外细胞安全浓度较低,低浓度小檗碱对脂肪细胞即具有显著的抗IR活性。     

虎杖苷对3T3-L1前脂肪细胞增殖与分化的影响及其作用机制

目的:探讨虎杖苷(polydatin,PD)对于小鼠3T3-L1前脂肪细胞增殖与分化的影响及其作用机制。方法:培养小鼠3T3-L1前脂肪细胞,添加不同剂量虎杖苷分别处理24、48 h,用MTT法检测细胞增殖;在诱导3T3-L1前脂肪细胞分化的过程中添加不同剂量虎杖苷处理48 h,继续培养6 d后油红O染色观察脂肪细胞的分化程度;采用荧光定量PCR技术检测各组过氧化物酶体增殖物激活受体γ(PPARγ)、CCAAT/增强子结合蛋白-α(C/EBPα)、单核细胞趋化因子-1(MCP-1)和瘦素(Leptin)的mRNA表达水平;酶联免疫吸附法(ELISA)分析3T3-L1分化过程中虎杖苷对MCP-1蛋白分泌的影响。结果:PD显著促进3T3-L1前脂肪细胞增殖,并呈现一定的时间、剂量依赖效应。与对照组相比,PD抑制3T3-L1细胞分化;低剂量PD(20μmol·L~(-1))导致脂肪细胞中分化相关基因PPARγmRNA表达水平下降,并且可以抑制3T3-L1前脂肪细胞向脂肪细胞分化过程中炎症相关因子MCP-1的mRNA表达和蛋白分泌。高剂量PD(100μmol·L~(-1))对于PPARγmRNA表达水平影响不明显,不过可以使3T3-L1细胞分化过程中MCP-1的mRNA表达和蛋白分泌水平升高。添加低剂量和高剂量的PD导致成熟脂肪细胞中Leptin mRNA表达水平升高。结论:PD可以促进3T3-L1前脂肪细胞增殖,抑制前脂肪细胞分化,其机制可能是通过抑制PPARγ的表达。在3T3-L1前脂肪细胞分化过程中,PD通过抑制脂肪细胞中炎症相关因子MCP-1的表达及分泌,及增加Leptin基因表达,可能可以通过调控炎症状态影响肥胖。     

淫羊藿苷对3T3-L1前脂肪细胞增殖及分化的影响

目的研究淫羊藿苷(ICA)不同作用浓度及不同作用时间对3T3-L1前脂肪细胞增殖和分化的抑制作用。方法采用MTT法观察ICA对小鼠3T3-L1前脂肪细胞增殖的影响;应用ICA诱导小鼠3T3-L1前脂肪细胞分化,油红O染色测定细胞内脂质含量,观察ICA对小鼠3T3-L1前脂肪细胞分化的影响。结果 67μg/m L ICA对细胞增殖起抑制作用,持续至96 h并达到最大;30μg/m L和15μg/m L ICA在72 h、96 h对细胞增殖起抑制作用。结论较高浓度ICA对3T3-L1前脂肪细胞的分化有抑制作用,而低浓度ICA对3T3-L1前脂肪细胞的分化作用不明显。     

Effect of mollugin on apoptosis and adipogenesis of 3T3-L1 preadipocytes

The effect of mollugin, isolated from the roots of Rubia cordifolia L., on cell viability, apoptosis and adipogenesis in 3T3‐L1 preadipocytes was investigated. The inhibitory effect of mollugin (40–60 µm ) on cell viability was more significant in differentiated adipocytes than in 3T3‐L1 preadipocytes. In 3T3‐L1 cells, the cytotoxicity of mollugin was accompanied by apoptotic events including mitochondrial membrane potential (Δψm) loss and activation of caspase‐9, ‐3 and ‐7, leading to PARP degradation. Although the presence of 20 µm mollugin during induced adipocytic differentiation of 3T3‐L1 cells for 6 days failed to affect the cell viability, it could almost completely abrogate the differentiation‐associated morphology change and intracellular lipid accumulation. A similar level of inhibition was observed, when 20 µm mollugin was present during the early stage (D0–D2) of the differentiation period. In addition, the expression of C/EBPα, PPARγ1 and PPARγ2 was significantly down‐regulated. The presence of 20 µm mollugin during either middle stage (D2–D4) or late stage (D4–D6) of the differentiation period, however, caused the inhibition to a lesser extent. These results indicated that mollugin at high concentrations (40–60 µm ) exerted cytotoxicity via inducing apoptosis, whereas mollugin at a low concentration (20 µm ) suppressed adipocytic differentiation without exerting cytotoxicity in 3T3‐L1 preadipocytes. Copyright © 2010 John Wiley & Sons, Ltd.     

葛根素对3T3-L1前脂肪细胞分化及胰岛素抵抗模型糖代谢的影响

目的:研究葛根素(Pur)对3T3-L1前脂肪细胞增殖、分化的影响,以及在胰岛素抵抗状态下对3T3-L1脂肪细胞葡萄糖代谢的影响。方法:不同浓度Pur干预3T3-L1细胞,MTT法检测其对细胞增殖的影响;油红O染色法检测其对前脂肪细胞分化过程及成脂的影响;地塞米松诱导3T3-L1细胞建立胰岛素抵抗模型,用不同浓度Pur进行干预,测定细胞的葡萄糖消耗量。结果:Pur(3～300μmol/L)对3T3-L1前脂肪细胞增殖无明显影响;Pur(30～300μmol/L)促进3T3-L1细胞的分化成脂,增加胰岛素抵抗状态下3T3-L1脂肪细胞的葡萄糖代谢,且具有量效关系。结论:Pur能够促进3T3-L1细胞的分化成脂,增加胰岛素抵抗状态下3T3-L1脂肪细胞的葡萄糖代谢,改善胰岛素抵抗。     

Salacia reticulata inhibits differentiation of 3T3-L1 adipocytes

Aim of the study

The purpose of this study was to define antidiabetic effects of fruit of Vaccinium arctostaphylos L. (Ericaceae) which is traditionally used in Iran for improving of health status of diabetic patients.

Materials and methods

Firstly, we examined the effect of ethanolic extract of Vaccinium arctostaphylos fruit on postprandial blood glucose (PBG) after 1, 3, 5, 8, and 24 h following a single dose administration of the extract to alloxan-diabetic male Wistar rats. Also oral glucose tolerance test was carried out. Secondly, PBG was measured at the end of 1, 2 and 3 weeks following 3 weeks daily administration of the extract. At the end of treatment period the pancreatic INS and cardiac GLUT-4 mRNA expression and also the changes in the plasma lipid profiles and antioxidant enzymes activities were assessed.Finally, we examined the inhibitory activity of the extract against rat intestinal α-glucosidase.

Results

The obtained results showed mild acute (18%) and also significant chronic (35%) decrease in the PBG, significant reduction in triglyceride (47%) and notable rising of the erythrocyte superoxide dismutase (57%), glutathione peroxidase (35%) and catalase (19%) activities due to treatment with the extract. Also we observed increased expression of GLUT-4 and INS genes in plant extract treated Wistar rats. Furthermore, in vitro studies displayed 47% and 56% inhibitory effects of the extract on activity of intestinal maltase and sucrase enzymes, respectively.

Conclusions

Findings of this study allow us to establish scientifically Vaccinium arctostaphylos fruit as a potent antidiabetic agent with antihyperglycemic, antioxidant and triglyceride lowering effects.     

红景天苷通过激活3T3-L1前脂肪细胞Nrf2/HO-1信号通路及下调脂肪生成转录因子表达来抑制脂肪生成

目的:研究红景天苷对3T3-L1前脂肪细胞增殖分化及Nrf2/HO-1信号通路和脂肪生成转录因子的影响。方法:按文献介绍的方法诱导3T3-L1前脂肪细胞分化,然后分别用红景天苷(50和100μM)、吡格列酮(100μM)及红景天苷(100μM)与HO-1抑制剂ZnPP(3μM)共同处理3T3-L1细胞7天,分别于2、5、7天后进行胞内脂质含量测定,7天后进行胞内TG含量检测,实时定量PCR检测细胞中PPARγ、C/EBPα、SREBP-1c、aP2、adiponectin mRNA表达, Western blot检测胞浆和胞核中Nrf2及细胞中HO-1蛋白表达。结果:红景天苷(50和100μM)可显著抑制胞内脂质的积聚和TG生成,降低脂肪生成相关转录因子PPARγ、C/EBPα、SREBP-1c、aP2、adiponectin mRNA表达,抑制Nrf2核易位,上调HO-1蛋白表达,且量效关系明显;当与ZnPP联用后,上述作用被明显削弱。结论:红景天苷对3T3-L1前脂肪细胞分化和脂肪生成具有显著的抑制作用,其作用机制可能与其激活Nrf2/HO-1信号通路及抑制PPARγ、C/EBPα、SREBP-1c、aP2、adiponectin等脂肪生成转录因子的表达有关。     

齐墩果酸抑制3T3-L1脂肪细胞脂质堆积

目的：从57个中药化合物筛选具有抑制3T3-L1脂肪细胞脂质堆积的活性成分。方法：3T3-L1细胞培养至融合后用化合物进行干预,并诱导使其分化,采用高内涵影像方法检测细胞中脂滴含量。对发现的活性成分用ToxInsight体外毒性检测方法评价其肝毒性。结果：发现并验证活性成分齐墩果酸（OA）具有显著的脂质形成抑制作用,其半数抑制浓度（IC50）为14.5 μmol·L-1,且在60 μmol·L-1测试浓度范围内对HepG2 细胞无显著损伤作用。结论：OA 具有显著的降低脂质形成作用,是潜在的降脂候选化合物。     

Enhancement of adipose differentiation of mouse 3T3-L1 fibroblasts by ginsenosides

Some ginsenosides, extracted and purified from the roots of Panax ginseng C. A. Meyer, stimulated adipose differentiation of mouse 3T3-L1 fibroblasts. Ginsenoside Rb₁ induced adipose differentiation of 3T3-L1 cells in a culture medium supplemented with 20% fetal calf serum, but not in one with 10% fetal calf serum. Furthermore, ginsenoside Rb₁ enhanced adipose differentiation induced by insulin or dexamethasone plus 1-methyl-3-isobutylxanthine (DEX-MIX). Other ginsenosides such as ginsenoside Rd and Rh₂ also enhanced DEX-MIX-induced adipose differentiation, but ginsenosides Re, Rg₁ and Ro had no effect. These results suggest that there is a clear structure-activity relationship to the 20(S)-protopanaxadiol aglycone group only in stimulation of adipose differentiation.     

Inhibition of preadipocyte differentiation and lipid accumulation by Orengedokuto treatment of 3T3-L1 cultures

Obesity is a major cause of metabolic syndrome and is due to an increase in the number and hypertrophy of adipocytes. Accordingly, inhibition of the differentiation and proliferation of adipocytes may be used in the treatment and prevention of metabolic syndrome. This study investigated the effects of 50 commonly used Kampo medicines on the differentiation of 3T3-L1 preadipocytes to search for a drug with an antiobesity effect. Kampo medicines were screened, and the strongest differentiation-inhibitory effect was noted with Orengedokuto. To explore the active ingredients in Orengedokuto, the effects of four crude drug components of Orengedokuto were investigated. It was found that the differentiation-inhibitory effect of Orengedokuto was accounted for by Coptidis rhizome and Phellodendri cortex. Furthermore, berberine, a principal ingredient common to Coptidis rhizome and Phellodendri cortex, showed a differentiation-inhibitory effect. The effect of berberine involves an inhibition of the mRNA and protein expression of peroxisome proliferator-activated receptor γ (PPARγ) and CCAAT/enhancer binding protein α (C/EBPα). Moreover, berberine inhibited lipid accumulation in adipocytes. These findings suggest that an antiobesity effect could be a new indication for Orengedokuto and that its active ingredient is berberine, with a mechanism involving the inhibition of PPARγ and C/EBPα expression.