Dexmedetomidine Promotes Angiogenesis and Vasculogenic Mimicry in Human Hepatocellular Carcinoma through α2-AR/HIF-1α/VEGFA Pathway

ObjectiveDexmedetomidine (DEX), the most specific α₂-adrenergic receptor agonist widely used for its sedative and analgesic properties, has been reported to upregulate HIF-1α expression to protect hypoxic and ischemic tissues. However, it is largely unclear whether DEX can also upregulate Hypoxia-inducible factor-1 alpha (HIF-1α) expression and its downstream vascular endothelial growth factor-A (VEGFA) in cancer tissues with oxygen-deficient tumor microenvironment.MethodsWe used SMMC-7721 cells, MHCC97-H cells, and a mouse model of orthotopic hepatic carcinoma to explore the effect of DEX on angiogenesis and vasculogenic mimicry (VM) and its mechanism. Under normoxic (20% O₂) and hypoxic (1% O₂) conditions, DEX was used to intervene cells, and yohimbine was used to rescue them.ResultsThe results showed that DEX promoted angiogenesis and VM in human liver cancer cells within a certain dose range, and the addition of yohimbine inhibited this effect. DEX could activate HIF-1α/VEGFA pathway, which was further verified by silencing HIF-1α. Consistently, in vivo results also showed that DEX can up-regulate HIF-1α/VEGFA expression, and enhance the number of VM channels and microvessel density (MVD).ConclusionWe believe that HIF-1α/VEGFA might be an important signaling pathway by which DEX promotes angiogenesis and VM formation in human hepatocellular carcinoma, whereas α₂-adrenergic receptor mediation might be the critical mechanisms.     

Hydroxysafflor Yellow A Promotes HaCaT Cell Proliferation and Migration by Regulating HBEGF/EGFR and PI3K/AKT Pathways and Circ＿0084443

Objective: To investigate the effect and possible mechanism of hydroxysafflor yellow A(HSYA) on human immortalized keratinocyte cell proliferation and migration. Methods: HaCaT cells were treated with HSYA.Cell proliferation was detected by the cell counting kit-8 assay, and cell migration was measured using wound healing assay and Transwell migration assay. The mRNA and protein expression levels of heparin-binding epidermal growth factor(EGF)-like growth factor(HBEGF), EGF receptor(EGFR), phosp...     

Effect of TSLC1 Gene on Proliferation, Invasion and Apoptosis of Human Hepatocellular Carcinoma Cell Line HepG2

The recombinant plasmid pCI-TSLC1 carrying TSLC1 gene was stably transfected into human hepatocellular carcinoma cell line HepG2. Cell proliferation was analyzed by MTT assay. The ability of migration was determined by transwell and FACSort flow cytometry was used to detect the cell cycle distribution and apoptosis. Western blotting revealed that H4 expressed higher amounts of TSLC1 protein than H15 and H0 did. The growth of TSLCl-transfected cells was significantly suppressed in vitro, and the ability of migration was reduced as well. The re-expression of TSLC1 could induce cell apoptosis. It was concluded that TSLC1 strongly inhibited the growth and ability of migration of HepG2 cell line in vitro and also induced apoptosis, suggesting that TSLC 1 could reduce the tumorigenicity of human hepatocellular carcinoma cell line HepG2 in vitro, which provided a basis for further exploring the roles of TSLC1 in hepatocellular cellular carcinoma.     

The Relationship Between Mast Cell Infiltration and the Expression of PCNA and EGFr in Experimental Hepatocellular Carcinoma

（阮幼冰）（武忠弼）ＴｈｅＲｅｌａｔｉｏｎｓｈｉｐＢｅｔｗｅｅｎＭａｓｔＣｅｌｌＩｎｆｉｌｔｒａｔｉｏｎａｎｄｔｈｅＥｘｐｒｅｓｓｉｏｎｏｆＰＣＮＡａｎｄＥＧＦｒｉｎＥｘｐｅｒｉｍｅｎｔａｌＨｅｐａｔｏｃｅｌｌｕｌａｒＣａｒｃｉｎｏｍａｏｆＬｉｖｅｒ...     

PIN1 Gene Overexpression and β-catenin Gene Mutation/Expression in Hepatocellular Carcinoma and Their Significance

The evolution of hepatocellular carcinoma (HCC) is a compound process which involves many kinds of genes and transductional pathways. The expression of the peptidyl-proplyl- isomerase PIN1 gene, the mutation in exon 3 of β-catenin and its correspondent abnormal expression and their roles in the hepatocellular carcinogeneisis were investigated. Among 29 pair cases of HCC and non-carcinoma tissues, the expression of PIN1 gene was detected by immunochemical staining. Mu-tations in exon 3 of β-catenin gene and differential expression of β-catenin gene were investigated by the methods of PCR-SSCP, direct sequencing and immunohistochemical technique as well. The re-sults indicated: (1) 44.8% (13/29) cases of HCC presented higher level of PIN1 gene expression than non-cancerous tissues (χ2 =32.63, P<0.05), especially in cytoplasm and nucleus, while there was lower level of PIN1 expression in non-cancerous tissues; (2) 58.6% (17/29) HCC tissues showed β-catenin protein accumulation in cytoplasm and nucleus. 46.2% (6/13) HCC tissues indicated β-catenin protein accumulation with higher level of PIN1 expression, while 53.8% (7/13) HCC tis-sues indicated β-catenin protein accumulation with lower level or trace of PIN1 expression (χ2 =0.00, P>0.05); (3) 24.1% (7/29) of primary tumor lesions carried gene mutations in exon 3 of β-catenin, and accompanied by β-catenin protein accumulation. There was no mutation in non-cancerous tissues. All the mutation presented in tissues with low level of PIN1 expression. There was no mutation of β-catenin gene in tissues with high PIN1 expression level (χ2=58.12, P<0.05). So it was postulated that the increase of PIN1 gene expression could promote hepatocellular carcinogenesis via a way dif-ferent from β- catenin gene mutation.     

CD151 Promotes Proliferation and Migration of PC3 Cells via the Formation of CD151-integrin α3/α6 Complex

Over-expression of CD151 was found to be associated with metastasis and poor prognosis of prostatic carcinoma. This study was designed to examine the mechanism by which CD151 promotes the proliferation and migration of prostatic cancer cells. The pAAV-CD151, pAAV-GFP and pAAV-CD151-AAA mutant plasmids were constructed and used to transiently transfect PC3 cells (a prostatic carcinoma 3 cell line) by the mediation of Fugene HD. Then, the cells were assigned to control group, pAAV-GFP group, pAAV-CD151 group, and pAAV-CD151-AAA group respectively. Cell proliferation was evaluated by using the 3-[4,5-dimet-hylthiazol-2-yl]-2,5, diphenyltetrazolium bromide (MTT) method. Cell migration assay was performed by using Boyden chambers. The formation of CD151-integrin a3/a6 complex was determined by the method of co-immunoprecipitation. The protein expression levels of CD151 and extracellular signal-regulated kinase (ERK) were measured by Western blotting. The results showed that transfection of pAAV-CD151 or pAAV-CD151-AAA mutant increased the expression of CD151 protein in PC3 cells. Co-immunoprecipitation showed that more CD151-integrin a3/a6 complex was formed in the pAAV-CD151 group than in the control group, the pAAV-GFP group and the pAAV-CD151-AAA mutant group. Furthermore, the proliferative and migrating capacity of PC3 cells was substantially increased in the pAAV-CD151 group but inhibited in the pAAV-CD151-AAA mutant group. CD151 transfection increased the expression of phospho-ERK. Taken together, it was concluded that CD151 promotes the proliferation and migration of PC3 cells through the formation of CD151-integrin complex and the activation of phosphorylated ERK.     

Exposure to PM2.5 Enhances the PI3K/AKT Signaling and Malignancy of ERα Expression-dependent Non-small Cell Lung Carcinoma

Atmospheric particulate matter (PM) 2.5 is a major carcinogen?and?is?associated?with?an?increased risk of developing various cancers and pulmonary fibrous diseases[1–2]. Non-small cell lung cancer (NSCLC) is the major type of lung cancer with high morbidity and mortality rates. Epidemiological studies report that the incidence of NSCLC, particularly adenocarcinoma, significantly differs with the gender[3]. Female patients with NSCLC have unique epidemiologic characteristics, imaging profiles, clinical manifestations, and pathological characteristics[4]. Non-smoking women have a 2.5-times higher risk of developing NSCLC than non-smoking men, suggesting the effect of estrogen and its receptors[5–6]. Activated estrogen receptors (ERs) can regulate the expression of many genes and interact with several signaling pathways to regulate the malignancy of cancers;?however, the ER-related mechanism underlying the regulation of PM2.5-modulated?malignancy?of?NSCLC?is?unclear.     

氯化锂对脑缺血预处理后PI3K/AKT/GSK3β通路的影响机制

目的：研究脑缺血预处理（CIPC）中氯化锂对PI3K/AKT/GSK3β信号通路调节变化及影响。方法：制作脑缺血、CIPC及氯化锂干预模型,进行神经功能缺损评分;TTC法脑组织染色计算脑梗死体积;应用Western blotting检测AKT、p-AKT、GSK-3β、p-GSK-3β（ser9）、Mcl-1的蛋白表达。结果：与脑缺血组比较,氯化锂组及CIPC组p-AKT、Mcl-1、p-GSK-3β（ser9）的蛋白表达均增高,神经功能缺损评分及脑梗死体积降低（P〈0.05）;与CIPC组比较,氯化锂组进一步提高了p-AKT、Mcl-1、p-GSK-3β（ser9）的蛋白表达、降低了神经功能缺损评分及脑梗死体积（P〈0.05）。结论：脑缺血预处理增高p-GSK-3β（ser9）表达,增加p-AKT、Mcl-1的表达。氯化锂可加强脑缺血预处理的这一神经保护作用。     

脓毒症通过抑制AKT/GSK3β磷酸化导致骨骼肌细胞膜nAChRs聚集障碍

目的 探究蛋白质丝氨酸苏氨酸蛋白激酶（AKT）/糖原合成酶激酶3β（GSK3β）介导的信号通路在脓毒症导致骨骼肌细胞膜上烟碱型乙酰胆碱受体（nAChRs）聚集障碍中的作用。方法 小鼠源性C2C12肌原细胞经2%马血清诱导分化为肌管后随机分为4组：Sham组：假手术小鼠血清处理;Sepsis组：脓毒症小鼠血清处理;Sepsis+D组：脓毒症小鼠血清和二甲基亚砜（DMSO）处理;Sepsis+SB组：脓毒症小鼠血清和GSK3β抑制剂SB216763处理,各组在作相应处理前均加入Agrin蛋白诱导nAChRs聚集。血清处理 5.5 h后采用 Alexa Fluor 594-conjugated α-bungarotoxin（α-BTX）标记肌管膜上 nAChRs聚集簇,采用 Western blotting检测AKT、磷酸化AKT（p-AKT）、GSK3β、磷酸化GSK3β（p-GSK3β）、细胞质连接蛋白相关蛋白2（CLASP2）的表达水平,采用免疫共沉淀（Co-IP）检测磷酸化CLASP2（p-CLASP2）以及CLASP2与微管蛋白α-tubulin的结合水平。结果 与Sham组相比,Sepsis 组 C2C12 肌管膜上 nAChRs 聚集簇面积和密度均降低,p-AKT、p-GSK3β水平下降,p-CLASP2 水平升高,CLASP2 与 α-tubulin 的结合减少;与 Sepsis+D 组相比,Sepsis+SB 组 C2C12 肌管膜上 nAChRs 聚集簇面积和密度均增加,p-CLASP2水平降低,CLASP2与α-tubulin的结合水平增加。结论 脓毒症小鼠血清通过抑制Akt/GSK3β磷酸化导致下游信号分子CLASP2与α-tubulin结合减少,引起C2C12肌管膜上nAChRs聚集障碍。     

Effects of Peptide Nucleic Acids against Ki-67 Gene on the Proliferation and Apoptosis of Human Renal Carcinoma Cell Line

Ki-67 antigen is a DNA-binding protein which is an absolute requirement for proliferation of tumor cells[1]. Since transformation of malignant cells is frequently associated with high cell proliferation and proliferation is closely associated with the Ki-67 protein labeling index, this protein may serve as a potential target for cancer therapy although a causative involvement of Ki-67 ex-pression has not been conclusively demonstrated so far. PNAs are synthetic structure homologues of antise…     

Relationship between the Expression of CD44v6 and Development,Progress, Invasion and Metastasis of Laryngeal Carcinoma

The expression of CD44v6 and its relationship with the development, progress, invasion and metastasis of laryngeal carcinoma was investigated. The expression and content of CD44v6 mRNA in tissuess were detected by both RT-PCR and FCM which were respectivelyextracted from normal laryngeal mucosa, leukoplakia of larynx, laryngeal papilloma, polyp of vocal cord, tissues of laryngeal carcinoma, metastatic and nonmetastatic lymph nodes of neck, and tissues close to carcinoma. The outcome of RT PCR indicated that the expression rate of CD44v6 mRNA involved in tissues of laryngeal carcinoma and metastatic lymph nodes of neck was the highest (90 %- 100%) compared with that of leukoplakia of larynx, laryngeal papilloma, tissues close to carcinoma by 0.5cm (55.56%--60.00%) and that of normal laryngeal mucosa, polyp of vocal cord, nonmetastatic lymph nodes and tissues close to carcinoma by 1.0 cm was the lowest (13.33%--20%). The result from FCM was highly consistent with that from RT-PCR. It was suggested that CD44v6 was closely related with the development, progress, invasion and metastasis of laryngeal carcinoma. The outcome from the tissues close to carcinoma by different distance could do help to the determination of incisal edge in surgery abstractly.     

慢性氧化应激激活GSK3β/β-catenin信号通路增强乳腺癌细胞MCF-7活性的机制研究

目的 建立MCF-7乳腺癌细胞慢性氧化应激细胞模型,观测MCF-7乳腺癌细胞在慢性氧化应激下的增殖情况,探讨慢性应激状态对乳腺癌增殖、迁移和侵袭的影响及其可能机制。方法 CCK-8法检测MCF-7分别在急性氧化应激和慢性氧化应激干预的情况下的增殖抑制率,通过划痕实验和transwell实验检测慢性氧化应激条件下MCF-7细胞迁移和侵袭的能力。通过ELISA法测定IL-6水平,检测慢性氧化应激模型条件下MCF-7的超氧化物歧化酶活性（SOD）和总抗氧化能力（T-AOC）。qPCR及Western blot检测GSK3β/β-catenin信号通路相关蛋白及RNA表达水平。结果 与急性氧化应激比较,慢性氧化应激条件下,MCF-7的增殖能力增强,其SOD和T-AOC的能力也进一步增强。其迁移和侵袭的能力均强于野生型和急性氧化应激下的MCF-7。该结果和IL-6蛋白表达,GSK3β/β-catenin信号通路相关蛋白和RNA表达相一致。同时发现三黄煎剂能够抑制MCF-7慢性氧化应激细胞的增殖。结论 慢性氧化应激状态能够促进MCF-7乳腺癌细胞增殖和转移,其机制可能与GSK3β/β-catenin信号通路激活和IL-6表达增加相关。      

二甲双胍通过PI3K/AKT/GSK3β信号通路对肺癌A549细胞增殖的影响

目的:探讨二甲双胍对非小细胞肺癌A549细胞增殖的影响,并阐明其可能的作用机制.方法:将肺癌A549细胞分为对照组和不同浓度(1、2、4、8、16和32 mmol·L-1)二甲双胍组,MTT法检测作用24、48和72 h后各组A549细胞增殖率,克隆形成实验检测各组A549细胞克隆形成数,细胞划痕实验检测各组A549细...     

Effects of HDAC4 on IL-1β-induced matrix metalloproteinase expression regulated partially through the WNT3A/β-catenin pathway

Background::Histone deacetylase 4 (HDAC4) regulates chondrocyte hypertrophy and bone formation. The aim of the present study was to explore the effects of HDAC4...     

Mechanism of Hewei Jiangni Capsule(和胃降逆胶囊)Regulating Proliferation and Apoptosis of Human Gastric Cancer AGS Cells Through PI3K/AKT Signaling Pathway

目的:探究和胃降逆胶囊对人胃癌AGS细胞增殖和凋亡的影响及其作用机制.方法:用不同药物剂量(3 g/kg、6 g/kg、12 g/kg)制备的和胃降逆胶囊含药血清分别干预人胃癌AGS细胞,分为和胃降逆胶囊含药血清低剂量组、中剂量组、高剂量组及空白组,分别干预AGS细胞24 h、48 h、72 h后,采用四甲基偶氮唑蓝(MTT)法检测细胞增殖情况,采用流式细胞仪检测细胞周期分布情况,蛋白质印迹法(Western blot)检测细胞相关蛋白磷酸化磷脂酰肌醇3-激酶(p-PI3K)、磷酸化蛋白激酶B(p-AKT)、促凋亡基因(Bax)、抑细胞凋亡蛋白(Bcl-2)、细胞周期蛋白D1 (Cyclin D1)和细胞周期蛋白依赖性抑制剂(p21)的表达情况;实时荧光定量聚合酶链式反应(RT-PCR)法检测细胞凋亡相关基因Bax、Bcl-2、Cyclin D1和p21 mRNA表达情况.结果:随着和胃降逆胶囊含药血清作用时间的延长,各药物组细胞活力逐渐降低,同剂量组24h、48 h、72 h比较差异有统计学意义(P＜0.05),48 h与72 h比较差异无统计学意义.在同一干预时间点,细胞活力随着药物血清浓度的增加而降低.各组含药血清处理AGS细胞48 h后,G0/G1期细胞比值与空白组比较,差异具有统计学意义(P＜0.05);和胃降逆胶囊可以下调AGS细胞中p-PI3K、p-AKT蛋白及抑制凋亡蛋白Bcl-2和Cyclin D1的表达(P＜0.05),上调AGS细胞中促凋亡蛋白Bax和p21的表达(P＜0.05);和胃降逆胶囊可以下调AGS细胞中抑制凋亡基因Bcl-2和Cyclin D1 mRNA的表达(P＜0.05),上调AGS细胞中促凋亡基因Bax和p21 mRNA的表达(P＜0.05),且呈现出浓度相关性.结论:和胃降逆胶囊通过抑制PI3K/AKT通路的活化,调控下游周期阻滞相关基因和凋亡相关基因的表达,进而抑制人胃癌AGS细胞增殖并促进AGS细胞凋亡.     

Total Ginsenoside Extract from Panax ginseng Enhances Neural Stem Cell Proliferation and Neuronal Differentiation by Inactivating GSK-3β

Objective:To study the effects of total ginsenosides(TG)extract from Panax ginseng on neural stem cell(NSC)proliferation and differentiation and their underlyin...     

吡非尼酮对UUO大鼠肾组织中GSK3β蛋白、WNT/β-catenin通路的影响

目的探讨吡非尼酮对UUO大鼠肾间质纤维化组织中GSK3-β蛋白、Wnt/β-catenin通路的影响及其对肾间质纤维化的作用。方法将Wistar雄性大鼠72只,随机分为3组:假手术组、UUO组以0.9%Nacl2mL/d灌胃,吡非尼酮组在UUO组的基础上以吡非尼酮250mg/kg溶解在0.9%Nacl2mL/d灌胃。各组大鼠于术后第3,7,14天分别处死8只。结果在各时间点,与假手术组相比较,UUO模型组肾小管间质损伤和纤维化程度明显,GSK3-β蛋白、β-catenin明显表达增多,差异具有统计学意义(P0.05);且随着梗阻时间延长(3、7、14天),UUO模型组大鼠的GSK3-β蛋白及β-catenin的表达逐渐增加。与UUO组相比吡非尼酮组大鼠肾间质组织中GSK3-β蛋白,β-catenin表达水平显著降低(P0.05)。结论吡非尼酮能够通过下调GSK3-β蛋白的表达进而调节Wnt/β-catenin信号通路抑制β-catenin的产生延缓肾间质纤维化的发生及发展,可能为肾纤维化的临床治疗及研究提供新的作用靶点及理论依据。