MC-002 exhibits positive effects against platelets aggregation and endothelial dysfunction through thromboxane A2 inhibition

Introduction

Thromboxane A₂ (TXA₂) induces platelet aggregation and vasoconstriction, and agents that inhibit TXA₂ production or interaction with receptors may exert potential application in stroke therapy.

Aim

To illustrate the platelet aggregation antagonistic and endothelial protective effect of (E) - 3 - (3 - methoxy - 4 - ((3, 5, 6 - trimethylpyrazin - 2 - yl) methoxy) phenyl) sodium acrylate (MC-002) through TXA₂ inhibition and underline mechanisms.

Materials and methods

Platelets aggregation and thoracic aorta ring contraction of rabbits were induced by U46619. Human umbilical vein endothelial cells (HUVECs) were further applied to explore the protective effect of MC-002 on endothelium when exposed to tumor necrosis factor - α (TNF-α). MTT method was used to assess cell damage, and ELISA analysis was exerted to estimate nitrogen monoxide (NO), endothelin-1 (ET-1), thromboxane B₂ (TXB₂) and 6-keto-prostaglandin F1α (6-keto-PGF1α) releasing. Fluorescence spectrophotometry was conducted to determine intracellular calcium concentration ([Ca^2 +]_i), and western blotting method was applied to evaluate the protein expressions of intracellular adhesion molecule-1 (ICAM-1), P-selectin and nuclear factor-kappa B (NF-κB).

Results and conclusions

TXA₂ analog U46619 mediated obvious platelet aggregation and vasoconstriction. MC-002 inhibited platelet aggregation through administration in vivo and incubation with platelet in vitro, and relaxed aorta ring in endothelium dependent manner. MC-002 alleviated cell damage, [Ca^2 +]_i overload, ET-1 overexcretion and TXB₂ activation, but improved NO availability reduction in HUVECs treated with TNF-α. Furthermore, MC-002 downregulated ICAM-1, P-selectin and NF-κB overexpression induced by TNF-α. In conclusion, MC-002 exerted antiplatelet aggregation effect through TXA₂ inhibition and relieved inflammatory injury of endothelial cells through NF-κB signal pathway.     

Angiogenic effect of the aqueous extract of Cynodon dactylon on human umbilical vein endothelial cells and granulation tissue in rat

Background

Cynodon dactylon, a valuable medicinal plant, is widely used in Iranian folk medicine for the treatment of various cardiovascular diseases such as heart failure and atherosclerosis. Moreover, its anti-diabetic, anti-cancer and anti-microbial properties have been also reported. Concerning the critical role of angiogenesis in the incidence and progression of tumors and also its protective role in cardiovascular diseases, we investigated the effects of the aqueous extract prepared from the rhizomes of C. dactylon on vascular endothelial growth factor (VEGF) expressions in Human Umbilical Vein Endothelial Cells (HUVECs) and also on angiogenesis in carrageenan induced air-pouch model in rats.

Methods

In the air-pouch model, carrageenan was injected into an air-pouch on the back of the rats and following an IV injection of carmine red dye on day 6, granulation tissue was processed for the assessment of the dye content. Furthermore, in an in vitro study, angiogenic property of the extract was assessed through its effect on VEGF expression in HUVECs.

Results

Oral administration of 400 mg/kg/day of the extract significantly increased angiogenesis (p < 0.05) and markedly decreased neutrophil (p < 0.05) and total leukocyte infiltration (p < 0.001) into the granulation tissues. Moreover, the extract increased the expression of total VEGF in HUVECs at a concentration of (100 μl/ml).

Conclusion

The present study showed that the aqueous extract of C. dactylon promotes angiogenesis probably through stimulating VEGF expression.     

久强脑立清对人脐静脉内皮细胞一氧化氮和内皮素分泌的影响

目的观察久强脑力清 (JNQ)含药血清对人脐静脉内皮细胞 (HUVECs)分泌一氧化氮 (NO)和内皮素 (ET 1)的影响 ,探讨其对HUVECs血管活性分子分泌的调节作用。方法取原始JNQ含药血清体积分数的 80 %、40 %、2 0 %、10 %和 5 %作用于原代培养的HUVECs 2 4h后 ,分别检测上清中的NO和EI 1的含量。结果不同浓度的JNQ含药血清作用组的NO、ET 1含量与正常血清对照组比较增加 (P <0 0 5 ) ;NO/ET 1比值随着含药血清浓度的增加 ,比正常血清组增高 (P <0 0 5 )。结论JNQ含药血清通过提高HUVECs分泌NO和ET 1,具有保护内皮细胞功能和维持NO/ET 1平衡的作用     

内皮细胞提取和UHPLC-LTQ-Orbitrap法分析筛选苦碟子注射液中的活性成分

应用细胞生物色谱法及UHPLC-LTQ-Orbitrap质谱联用技术快速筛选鉴定苦碟子注射液中可能的活性成分。选择人脐静脉内皮细胞(huma umbilical vein endothelid cells,HUVEC)作为靶细胞,先使苦碟子注射液中的活性成分与靶细胞特异性结合,经细胞靶点脱敏失活后,应用LC-MS快速鉴定与细胞靶向亲和的化学成分,从而筛选得到苦碟子注射液中可能的活性成分。根据获得的精确相对分子质量数据、保留时间以及结合苦碟子注射液中的化学成分进行鉴定归属。最终,从细胞裂解液中共筛选鉴定出9个化学成分,其中包括倍半萜内酯类成分4个、有机酸类成分3个以及黄酮类成分2个。应用细胞生物色谱法与UHPLC-LTQ-Orbitrap质谱联用技术快速筛选鉴定苦碟子注射液中可能的活性成分,可为苦碟子注射液药效物质基础研究提供一种快捷、有效的方法学借鉴。     

Anti-angiogenic effects and mechanisms of polysaccharides from Antrodia cinnamomea with different molecular weights

Ethnopharmacological relevance

Antrodia cinnamomea is a popular medicinal mushroom in Taiwan that has been widely used for treatment of various cancers and liver diseases.

Aim of the study

This study aimed to investigate the immunomodulatory effect on angiogenesis of polysaccharides from mycelia of Antrodia cinnamomea (PMAC).

Materials and methods

PMAC were extracted in boiling water, precipitated with 95% ethanol, and separated into four different molecular weights (<5, 5–30, 30–100, >100 kDa). Tube formation and chorioallantoic membrane (CAM) assay were used to determine the in vitro and ex vivo anti-angiogenic effects.

Results

Only the PMAC-mononuclear cells (MNCs)-conditioned medium (CM) with MW > 100 kDa significantly and concentration-dependently decreased the secretion of vascular endothelial growth factor in human leukemia cells and inhibited the matrigel tube formation in human umbilical vein endothelial cells. Similarly only the PMAC-MNC-CM with MW > 100 kDa significantly and concentration-dependently increased the levels of interleukin (IL)-12 and interferon-γ (IFN-γ). In addition, the ex vivo CAM assay revealed that only the PMAC with MW > 100 kDa significantly and dose-dependently inhibited neovascularization.

Conclusions

PMAC with MW > 100 kDa are anti-angiogenic in vitro and ex vivo, and the effects are likely through immunomodulation.     

不同浓度血管紧张素Ⅱ对人脐静脉血管内皮细胞衰老和P-选择素表达的影响

目的观察不同浓度血管紧张素Ⅱ（AngⅡ）对诱导人脐静脉血管内皮细胞（HUVEC）衰老和P-选择素表达的影响。方法体外培养HUVEC,随机分为对照组和含不同浓度AngⅡ组（10-8～10-5mmol/L）共5组,用含不同浓度AngⅡ的培养基诱导细胞衰老,β-半乳糖苷酶（β-gal）染色法鉴定内皮细胞衰老状态;流式细胞技术分析细胞周期变化;CCK-8法检测细胞存活率情况;ELISA检测各组培养基上清中P-选择素表达含量。结果 AngⅡ培养细胞48h后,β-gal阳性染色率随着AngⅡ浓度的增加逐渐增多（P均〈0.01）;细胞周期多停滞于G0/G1期,S期细胞逐渐减少,与对照组相比,10-8和10-7mmol/LAngⅡ组无明显差异（P〉0.05）,10-6和10-5mmol/LAngⅡ组有统计学差异（P〈0.05或P〈0.01）;细胞存活率与对照组相比明显下降;P-选择素表达含量随着AngⅡ浓度的增加明显增多（P均〈0.01）。结论 AngⅡ诱导HUVEC衰老,并呈剂量依赖性的抑制细胞增殖与增加P-选择素的表达。     

基于斑马鱼模型和分子对接技术的心可舒片促血管生成活性成分研究

目的 基于斑马鱼模型和分子对接技术研究心可舒片的促血管生成活性成分.方法 以人脐静脉内皮细胞HUVECs为模型,采用CCK-8与EdU-488细胞增殖检测试剂盒检测细胞活性与增殖能力,采用划痕实验与Transwell实验评价细胞迁移能力,采用成管实验检测各组细胞成管腔能力,评价心可舒片对HUVECs的促血管生成活性.以...     

The effect of artichoke (Cynara scolymus L.) extract on ROS generation in HUVEC cells

The effect of an artichoke extract on induced reactive oxygen species (ROS) generation in cultured human umbilical endothelial cells (HUVECs) and its reductive properties were evaluated. Preincubation of HUVEC cells with the artichoke extract at concentrations of 25-100 microg/mL for 24 h abolished ROS generation induced by LPS and oxyLDL as evaluated by the fluorescence intensity of 2',7'-dichlorofluorescein (DCF). Potent, concentration-dependent reductive properties of the artichoke extract were demonstrated by the reduction kinetics of cytochrome c in reference to ascorbate were also revealed. The results of the present study the warrant application of artichoke extracts as endothelium protecting agents.     

Concanavalin A promotes angiogenesis and proliferation in endothelial cells through the Akt/ERK/Cyclin D1 axis

ContextConcanavalin A (Con A) exhibited multiple roles in cancer cells. However, the role of Con A in endothelial cells was not reported.ObjectiveOur present study investigated the potential angiogenic role of Con A in endothelial cells and ischaemic hind-limb mice.Materials and methodsHuman umbilical vein endothelial cells and Ea.hy926 cells were employed to determine the effect of Con A (0.3, 1, and 3 μg/mL) or vehicle on angiogenesis and cell proliferation with tube formation, ELISA, flow cytometry, EdU, and western blot. Hind-limb ischaemic mice were conducted to determine the pro-angiogenic effect of Con A (10 mg/kg) for 7 days.ResultsCon A promoted tube formation to about three-fold higher than the control group and increased the secretion of VEGFa, PDGFaa, and bFGF in the medium. The cell viability was promoted to 1.3-fold by Con A 3 μg/mL, and cell cycle progression of G0G1 phase was decreased from 77% in the vehicle group to 70% in Con A 3 μg/mL, G2M was promoted from 15 to 19%, and S-phase was from 7 to 10%. Con A significantly stimulated phosphorylation of Akt and ERK1/2 and expression of cyclin D1 and decreased the expression of p27. These effects of Con A were antagonised by the PI3K inhibitor LY294002 (10 μM) and MEK pathway antagonist PD98059 (10 μM). Moreover, Con A (10 mg/kg) exhibited a repair effect in ischaemic hind-limb mice.Discussion and conclusionsThis study will provide a new option for treating ischaemic disease by local injection with Con A.