三七对脐静脉内皮细胞增殖的影响

目的：观察三七以不同浓度和作用时间促脐静脉内皮细胞（HUVEC）增殖的作用。方法：将三七提取物分别按0.25mg/ml、0.5mg/ml、1mg/ml、2mg/ml、4mg/ml不同的浓度分为5个给药组和1个空白组。细胞培养后加入加入不同浓度的三七提取物100μl,分别作用24h、48h后,测定吸光A值。结果：24h时,2mg/ml作用最强,细胞增殖率=12.23%;48h时,4mg/ml作用最强,细胞增殖率（%）=27.93%。结论：三七提取物浓度为4mg/ml,作用时间48h,促HUVEC增殖作用最明显。     

MicroRNA changes in human arterial endothelial cells with senescence: relation to apoptosis, eNOS and inflammation

A senescent phenotype in endothelial cells is associated with increased apoptosis, reduced endothelial nitric oxide synthase (eNOS) and inflammation, which are implicated in arterial dysfunction and disease in humans. We tested the hypothesis that changes in microRNAs are associated with a senescent phenotype in human aortic endothelial cells (HAEC). Compared with early-passage HAEC, late-passage HAEC had a reduced proliferation rate and increased staining for senescence-associated beta-galactosidase and the tumor suppressor p16^INK4a. Late-passage senescent HAEC had reduced expression of proliferation-stimulating/apoptosis-suppressing miR-21, miR-214 and miR-92 and increased expression of tumor suppressors and apoptotic markers. eNOS-suppressing miR-221 and miR-222 were increased and eNOS protein and eNOS activation (phosphorylation at serine1177) were lower in senescent HAEC. Caveolin-1 inhibiting miR-133a was reduced and caveolin-1, a negative regulator of eNOS activity, was elevated in senescent HAEC. Inflammation-repressing miR-126 was reduced and inflammation-stimulating miR-125b was increased, whereas inflammatory proteins were greater in senescent HAEC. Development of a senescent arterial endothelial cell phenotype featuring reduced cell proliferation, enhanced apoptosis and inflammation and reduced eNOS is associated with changes in miRNAs linked to the regulation of these processes. Our results support the hypothesis that miRNAs could play a critical role in arterial endothelial cell senescence.     

人参、三七1∶1组方对脐静脉内皮细胞增殖的影响

目的:观察人参、三七不同浓度和时间促脐静脉内皮细胞(HUVEC)增殖的作用.方法:将中药分别按0.25mg/ml、0.5mg/ml、1mg/ml、2mg/ml、4mg/ml不同的浓度分为5个给药组和1个空白组.细胞培养后加入不同浓度的人参三七提取物100μl,分别作用24h、48h后,测定吸光A值.结果:24h时,2m...     

葛根总黄酮对高糖致血管内皮细胞损伤的保护作用及其机制

目的观察葛根总黄酮对高糖致脐静脉内皮细胞(HUVEC)增殖和细胞周期的影响,探讨葛根总黄酮保护高糖致HUVEC损伤的作用机制。方法采用MTT法观察不同浓度葡萄糖对HUVEC增殖的影响,并观察不同浓度葛根总黄酮对高糖环境下HUVEC增殖及用流式细胞仪检测细胞周期的变化,并测定细胞上清液中SOD活性、NO和ICAM-1的含量。结果30 mmol.L-1葡萄糖可明显抑制HUVEC的增殖反应;降低S期细胞的百分率,增加G0/G1期细胞百分率;并降低HUVEC上清液中SOD活性和NO的含量、升高ICAM-1的含量。葛根总黄酮干预后,随着药物浓度的增加,G0/G1期细胞百分率递减,而S期细胞百分率递增;并可提高细胞上清液中NO水平和SOD活性,降低ICAM-1水平,与30 mmol.L-1葡萄糖比较(P<0.05)。结论葛根总黄酮对高糖致HUVEC损伤具有一定的保护作用,该作用的产生可能与其抑制高浓度葡萄糖作用下HU-VEC的增殖,促使细胞由G0/G1进入S期,使DNA合成增加,使细胞上清液中SOD活性和NO含量增加,而ICAM-1的含量降低等有关。葛根总黄酮对防治糖尿病血管病变的发生发展具有积极的意义。     

氟尿嘧啶抗血管生成作用的实验研究

目的：探讨氟尿嘧啶(5-FU)的抗血管生成作用。方法：以人脐静脉内皮细胞(HUVEC)原代培养模型，MTT法测定5-FU对HUVEC增殖的影响；采用鸡胚尿囊膜血管形成模型(CAM模型)，观察5-FU对鸡胚尿囊膜新生血管的抑制作用。结果：5-FU在非细胞毒浓度下可在体外抑制HUVEC的增殖，在体内抑制鸡胚尿囊膜新生血管形成。结论：5-FU在非细胞毒浓度下具有抗血管生成作用。     

Transwell小室共培养条件下缺氧时视网膜色素上皮细胞对内皮细胞增殖的影响

目的 研究在Transwell小室共培养系统中,缺氧时视网膜色素上皮细胞(retinal pigment epithelium,RPE)对血管内皮细胞增殖的影响.方法 培养并鉴定RPE细胞和人脐静脉血管内皮细胞,利用200 μmol/LCoC12造成细胞缺氧、Transwell小室建立细胞共培养模型.实验分为4组:对照...     

阿魏酸钠对氧化低密度脂蛋白所致的内皮细胞释放NO的影响

目的：分析阿魏酸钠的抗动脉粥样硬化作用机制，为临床治疗提供理论依据。方法：首先在体外进行低密度脂蛋白的氧化，然后分别与加有不同浓度的阿魏酸钠的人脐静脉内皮细胞（HUVEC）共同孵育，测定培养基上清液中NO的含量，从而观察阿魏酸钠对氧化低密度脂蛋白所致HUVEC释放NO的影响。结果：阿魏酸钠能明显抑制UVEC所致的NO下降作用，这种抑制作用无剂量依赖性。结论：阿魏酸钠的抗动脉粥样硬化作用机制可能通过NO发挥作用。     

Colonic epithelial cells induce endothelial cell expression of ICAM-1 and VCAM-1 by a NF-kappaB-dependent mechanism.

Epithelial cells are positioned in close proximity to endothelial cells. A non-contact coculture system was used to investigate whether colonic epithelial cells activated with various cytokines are able to provide signals that can modulate ICAM-1 and VCAM-1 expression on endothelial cells. Coculture of human umbilical vein endothelial cells (HUVEC) and human microvascular endothelial cells (HMEC-1) with TNF-alpha/IFN-gamma-stimulated human colon epithelial cell lines led to a significant up-regulation of endothelial ICAM-1 and VCAM-1 expression. Increased ICAM-1 and VCAM-1 expression by endothelial cells was accompanied by an increase in endothelial cell NF-kappaB p65 and NF-kappaB-DNA-binding activity. Inhibition of endothelial NF-kappaB activation using the proteosome inhibitors MG-132 and BAY 11-7082 resulted in a significant decrease of ICAM-1 expression, indicating an important role for NF-kappaB in this response. This cross-talk may represent a biological mechanism for the gut epithelium to control the colonic inflammatory response and the subsequent immune cell recruitment during inflammation.     

异鼠李素通过减轻氧化应激延缓D-半乳糖诱导的人脐静脉内皮细胞衰老

目的：探讨沙棘中的重要成分异鼠李素（ISO）对细胞衰老的影响及机制。方法：采用D-半乳糖（D-Gal）诱导细胞衰老模型,取20～23代的人脐静脉内皮细胞（HUVEC）分为4组：对照组、D-Gal组、D-Gal+ISO组（5 μmol/L）、D-Gal+ISO组（10 μmol/L）。其中D-Gal浓度为10 g/L,干预时间为72 h。采用CCK-8试剂盒检测各组细胞活力;衰老相关β-半乳糖苷酶（SA-β-Gal）染色试剂盒检测细胞衰老状态;各相关试剂盒检测细胞总活性氧（ROS）水平、丙二醛（MDA）含量、总超氧化物歧化酶（SOD）活性和过氧化氢酶（CAT）活性。Western blot法检测衰老标志蛋白p21、p27和核因子NF-E2相关因子2（Nrf2）及其下游蛋白表达水平。结果：ISO浓度≤10 μmol/L时对HUVEC无明显毒性作用;与对照组比较,D-Gal能够诱导细胞衰老指标SA-β-Gal活性增加（P<0.05）;提高p21、p27表达水平,提高细胞总ROS水平和MDA含量,降低总SOD和CAT活性,降低Nrf2及下游蛋白表达水平（P<0.05）。与D-Gal组比较,ISO能够降低细胞SA-β-Gal活性,抑制p21、p27表达,降低细胞总ROS水平和MDA含量,提高总SOD和CAT活性,增强Nrf2及下游蛋白表达（P<0.05）。结论：ISO可以通过减轻氧化应激,延缓D-Gal诱导的HUVEC细胞衰老,在此过程中激活Nrf2通路可能是其发挥抗衰老作用的重要机制。     

Anti-angiogenic activity of Ipomoea obscura extract and Ipobscurine-A

Objective: Ipomoea obscura (L.) Ker-Gawl, is a medicinal herb with indole alkaloids as an active constituent. In this study, we investigated the anti-angiogenic activity of I. obscura extract and one of its major compounds Ipobscurine-A (IPO-A).

Methods: In vivo angiogenesis was induced by injecting B16F10 melanoma cells intradermally on the shaven ventral skin of C57BL/6 mice. In vitro experiments were conducted using human umbilical vein endothelial cells.

Results: I. obscura and IPO-A significantly inhibited endothelial cell proliferation, migration, invasion, and tube formation in vitro. Vascular endothelial growth factor (VEGF)-induced sprouting of endothelial cells from rat aorta ex vivo was also inhibited. A marked decrease in the production of matrix metalloproteinases (MMPs) and the expressions of VEGF, cyclooxygenase-2, and nitric oxide synthase by B16F10 cells were observed after the treatment with the extract or IPO-A. Intraperitoneal administration of the extract significantly inhibited B16F10 melanoma cell line–induced neo-vessel formation in C57BL/6 mice in vivo. Analysis of serum cytokine profile clearly showed that extract significantly reduced the elevated levels of pro-inflammatory cytokines such as interleukins (IL)-1β, IL-6, tumor necrosis factor-α, and granulocyte–monocyte colony stimulating factor and the most potent angiogenic factor VEGF in animals. Serum NO level was also found to be significantly lowered by the administration of the extract. Anti-angiogenic factors such as TIMP-1 and IL-2 level were elevated in the extract-treated animals.

Conclusion: These data clearly demonstrate that I. obscura extract and IPO-A inhibit the tumor-specific angiogenesis by downregulating pro-angiogenic factors such as MMP, VEGF, and pro-inflammatory mediators and upregulating anti-angiogenic factors such as IL-2 and TIMP-1.