Garcinol对实验性口腔癌化学预防作用的研究

目的:探讨Garcinol对二甲基苯并蒽(7,12-dimethylbenz anthracene,DMBA)诱发的金黄地鼠口腔癌的化学预防作用.方法:30只金黄地鼠分3组:阴性对照组(6只)不涂药;阳性对照组(12只)涂0.5%DMBA于左侧颊囊,每周3次,共涂3周;Garcinol组(12只)前3周处理同阳性对照组...     

Garcinol对人口腔鳞癌细胞的抑制作用研究

目的 观察Garcinol对人口腔鳞癌细胞系SCC15增殖、细胞周期、凋亡和克隆形成能力的作用.方法 培养人口腔鳞癌细胞系SCC15,采用不同浓度的Garcinol处理细胞后,通过MTT法检测对细胞增殖的影响,PI单染色法流式细胞仪检测对细胞周期的影响,Annexin V-FITC/PI双染色法流式细胞仪检测对细胞凋亡的影响,克隆形成实验检测对细胞克隆形成能力的影响.结果 Garcinol能显著抑制SCC15细胞增殖(P＜0.01),并呈浓度和时间依赖性.Garcinol能抑制SCC15细胞周期由G1期向S期转变(P＜0.01),并呈浓度依赖性.Garcinol还能够诱导SCC15细胞凋亡(P＜0.01),并呈浓度依赖性.同时,Garcinol能抑制SCC15细胞的克隆形成能力(P＜0.01),并呈浓度依赖性.结论 Garcinol作为一种化学预防制剂,对人口腔鳞癌细胞SCC15具有显著的抑制作用,其机制主要包括抑制SCC15细胞增殖、细胞周期和克隆形成能力,并诱导细胞凋亡.     

山竹醇对人口腔鳞癌细胞糖酵解代谢通路的影响

目的 观察山竹醇(Garcinol)对人口腔鳞癌细胞系CAL27增殖和克隆形成能力的影响,以及对CAL27细胞糖酵解代谢的影响. 方法 培养人口腔鳞癌细胞系CAL27,不同浓度的Garcinol处理CAL27细胞, MTT法检测其对细胞增殖能力的影响.克隆形成实验检测对细胞克隆形成能力的影响.RT-PCR检测Garcinol对细胞内糖酵解通路关键酶表达的影响,以及对糖酵解通路的重要基因表达的影响.并检测细胞上清液中葡萄糖、乳酸含量的变化来评估Garcinol对CAL27细胞内糖酵解水平的影响.通过酶活性实验检测细胞内糖酵解关键酶(HK、PK、LDH)的酶活性变化. 结果 Garcinol能显著抑制CAL27细胞的增殖,呈浓度和时间依赖性(P<0.01);能明显抑制CAL27细胞的克隆形成能力(P<0.01).同时,Garcinol能促进糖酵解关键酶己糖激酶(HK),丙酮酸激酶(PK),乳酸脱氢酶(LDH)的基因表达,增强糖酵解关键酶(HK、PK、LDH)的酶活性(P<0.05).Garcinol也能增加AKT和mTOR的基因表达水平(P<0.05).Garcinol还能促进CAL27细胞的葡萄糖吸收和乳酸分泌.结论 Garcinol能够抑制人口腔鳞癌细胞系CAL27的增殖和克隆形成能力,同时也增加了细胞内的糖酵解水平.     

Garcinol,an Acetyltransferase Inhibitor,Suppresses Proliferation of Breast Cancer Cell Line MCF-7 Promoted by 17β-Estradiol

The acetyltransferase inhibitor garcinol, a polyisoprenylated benzophenone, is extracted from the rind of the fruit of Garcinia indica, a plant found extensively in tropical regions. Anti-cancer activity has been suggested but there is no report on its action via inhibiting acetylation against cell proliferation, cell cycle progression, and apoptosis-inhibtion induced by estradiol (E2) in human breast cancer MCF-7 cells. The main purposes of this study were to investigate the effects of the acetyltransferase inhibitor garcinol on cell proliferation, cell cycle progression and apoptosis inhibition in human breast cancer MCF-7 cells treated with estrogen, and to explore the significance of changes in acetylation levels in this process. We used a variety of techniques such as CCK-8 analysis of cell proliferation, FCM analysis of cell cycling and apoptosis, immunofluorescence analysis of NF-κB/p65 localization, and RT-PCR and Western blotting analysis of ac-H3, ac-H4, ac-p65, cyclin D1, Bcl-2 and Bclxl. We found that on treatment with garcinol in MCF-7 cells, E2-induced proliferation was inhibited, cell cycle progression was arrested at G0/G1 phase, and the cell apoptosis rate was increased. Expression of ac-H3, ac-H4 and NF-κB/ac-p65 proteins in E2-treated MCF-7 cells was increased, this being inhibited by garcinol but not ac-H4.The nuclear translocation of NF-κB/p65 in E2-treated MCF-7 cells was also inhibited, along with cyclin D1,Bcl-2 and Bcl-xl in mRNA and protein expression levels. These results suggest that the effect of E2 on promoting proliferation and inhibiting apoptosis is linked to hyperacetylation levels of histones and nonhistone NF-κB/p65 in MCF-7 cells. The acetyltransferase inhibitor garcinol plays an inhibitive role in MCF-7 cell proliferation promoted by E2. Mechanisms are probably associated with decreasing ac-p65 protein expression level in the NF-κB pathway, thus down-regulating the expression of cyclin D1, Bcl-2 and Bcl-xl.     

Effects of garcinol and guttiferone K isolated from Garcinia cambogia on oxidative/nitrative modifications in blood platelets and plasma

The effects of garcinol and guttiferone K, two polyisoprenylated benzophenones occurring a food plant called Garcinia cambogia, on oxidative/nitrative protein damage (determined by parameters such as levels of protein carbonyl groups and nitrotyrosine residues) in human blood platelets and plasma after treatment with peroxynitrite (ONOO^?) were studied in vitro. We also investigated the effects of garcinol and guttiferone K on lipid peroxidation in blood platelets and plasma induced by ONOO^? (100 µM). Exposure of blood platelets or plasma to peroxynitrite (100 µM) resulted in an increased level of carbonyl groups and nitrotyrosine residues in proteins, and an increase of lipid peroxidation measured by the level of thiobarbituric acid reactive species (TBARS). In the presence of garcinol and guttiferone K (0.1–25 µg/ml), a distinct reduction in the formation of carbonyl groups in plasma and platelet proteins together with the decrease of TBARS caused by 100 µM peroxynitrite, was observed. However, garcinol and guttiferone K did not inhibit plasma and platelet protein nitration induced by peroxynitrite. Polyisoprenylated benzophenones present in human diet such as garcinol or guttiferone K in vitro have protective effects against lipid and protein oxidation and may have some promising effects in vivo because they are good antioxidants in the tested models in vitro. Garcinol and guttiferone K can be also useful as protecting factors against diseases associated with oxidative stress.     

鞘内注射乙酰化酶p300抑制剂Garcinol对大鼠神经病理性痛的影响

目的观察鞘内注射乙酰化酶抑制剂Garcinol对L5脊神经结扎(spinal nerve ligation,SNL)大鼠痛觉高敏行为的影响,探讨其相关机制。方法雄性SD大鼠90只,日龄40~50d,体重180~220g。随机分为六组,每组15只。N组不做任何处理,S组仅暴露L5脊神经。C、H、M、L组大鼠行SNL手术。H、M、L组分别将Garcinol按500、100、20μg/kg溶于10μl的100%二甲基亚砜溶剂中,SNL术后第3天经鞘内导管给药,每天1次,连续给药4d。C组在相同时间鞘内注入10μl二甲基亚砜溶剂。于SNL术前1d(T0)、术后1d(T_1)、3d(T_2)、5d(T_3)、7d(T_4)、9d(T_5)、11d(T_6)、14d(T_7)测定各组大鼠热缩足潜伏期(thermal withdrawal latency,TWL)。T_4时取腰段脊髓,Western blot检测p300和乙酰化p65蛋白的表达水平,采用免疫荧光法测定脊髓背角核因子κB(NF-κB)的表达。结果 T_1~T_7时C、L、M、H组大鼠TWL明显短于N组,p300和乙酰化p65蛋白含量明显高于N组,脊髓背角NF-κB表达明显多于N组(P0.05)。T_3~T_7时M、H组大鼠TWL明显长于C组,p300和乙酰化p65蛋白含量明显低于C组,H组脊髓背角NF-κB表达明显少于C组(P0.05)。结论 p65乙酰化水平的增高参与了神经病理性痛的形成,鞘内注射乙酰化酶p300抑制剂Garcinol可以发挥镇痛作用,其机制可能与抑制p300介导的p65乙酰化,降低NF-κB表达水平有关。     

Garcinol protects against cerebral ischemia-reperfusion injury in vivo and in vitro by inhibiting inflammation and oxidative stress

Garcinol, a polyisoprenylated benzophenone derivative, is isolated from fruit rind of Garcinia indica. It is known to exert potent anti-inflammatory and anti-oxidative properties. In the present study, we tried to investigate the neuroprotective effects of garcinol on a rat model with middle cerebral artery occlusion/reperfusion (MCAO/R) and a cell model subjected to oxygen glucose deprivation and reperfusion (OGD/R). In vivo, we found that the rats with garcinol treatment showed a lower neurological deficit score and a smaller infarct size compared with the rats with ischemia-reperfusion (I/R) injury alone. We further found that garcinol treatment decreased cerebral I/R-induced inflammatory cytokines and oxidative stress, including inhibiting the production of interleukin (IL)-1β, IL-6, tumor necrosis factor-α (TNF-α), decreasing the levels of malonaldehyde (MDA) and nitric oxide (NO), and suppressing the decreased superoxide dismutase (SOD) activity. Moreover, the suppression of toll-like receptor (TLR) 4 and nuclear NF-κB (p65) expression by garcinol was found both in vivo and in vitro. In addition, NF-κB activator or TLR4 overexpression was employed to investigate its involvement in the effects of garcinol. The results showed that NF-κB activator or TLR4 overexpression at least in part reversed the anti-inflammatory and anti-oxidative properties of garcinol in vitro. Taken together, the data suggest that garcinol could protect against cerebral I/R injury through attenuating inflammation and oxidative stress, and improving neurological function. The molecular mechanism might be related to its suppression of TLR4/NF-ĸB signal pathway.